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HJ 2033-2013

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HJ 2033-2013English809 Add to Cart Days<=6 Technical specifications for fluoride and dust treatment in aluminum reduction waste gas Valid HJ 2033-2013
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Detail Information of HJ 2033-2013; HJ2033-2013
Description (Translated English): Technical specifications for fluoride and dust treatment in aluminum reduction waste gas
Sector / Industry: Environmental Protection Industry Standard
Classification of Chinese Standard: Z62
Classification of International Standard: 13.020
Word Count Estimation: 31,359
Quoted Standard: GB 4387; GB 16297; GB 25465; GB 50016; GB 50040; GB 50050; GB 50051; GB 50204; GB 50231; GB 50236; GB 50683; GB 50254; GB 50255; GB 50275; GB 50544; GBJ 87; GB/T 6719; GB/T 12801; GB/T 16157; GB/T 16758; GB/T 16845; GB/T 17397; GB/T 24487; GBZ 1; GBZ 2.1;
Drafting Organization: Northeastern University
Administrative Organization: Department of Environmental Protection
Regulation (derived from): Department of Environmental Protection Notice No. 60 of 2013
Summary: This standard specifies the electrolytic gas fluorides and dust control engineering design, construction, commissioning and operation and maintenance and other technical requirements. This standard applies to electrolytic fluoride gas and dust control pro

HJ 2033-2013
Technical specifications for fluoride and dust treatment in aluminum reduction waste gas
National Environmental Protection Standard of the People's Republic
Aluminum electrolysis waste gas fluoride and dust treatment engineering technology
Specification
Technical specifications for fluoride and dust treatment in aluminum
Reduction waste gas
Published on.2013-09-26
2013-12-1 Implementation
Ministry of Environmental Protection released
Content
Foreword.1
1 Scope 2
2 Normative references 2
3 Terms and Definitions..3
4 Contaminants and pollution loads..4
5 General requirements 5
5.1 General Provision 5
5.2 Construction scale.5
5.3 Engineering Composition.6
5.4 General layout 6
6 Process Design 7
6.1 General requirements 7
6.2 Process route selection.8
6.3 Equipment selection design.9
7 Major equipment and materials.14
7.1 bag filter 14
7.2 Alumina adsorbent..16
8 auxiliary engineering.16
8.1 General provisions.16
8.2 Compressed air supply..17
8.3 Water supply and drainage system 17
8.4 Building Structure. 18
9 Detection and process control.19
9.1 General provisions.19
9.2 Control Requirements and Control Strategies..19
9.3 Detection points and test parameters 20
9.4 Electrical and control system requirements. 21
9.5 Testing equipment requirements and maintenance.21
10 Labor Safety and Occupational Health 22
10.1 Labor Safety..22
10.2 Occupational Health..22
11 Construction and acceptance.22
11.1 General Provisions 22
11.2 Construction Management 23
11.3 Engineering Production and Installation..24
11.4 Engineering Installation..24
11.5 Purification system commissioning 25
11.6 Project Acceptance..26
12 Operation and maintenance.27
12.1 General requirements 27
12.2 Operation management of aluminum electrolysis workshop 28
12.3 Exhaust gas treatment system operation. 29
12.4 Gas collection system maintenance..29
12.5 Maintenance of the exhaust gas treatment system 30
Appendix A31
Appendix B35
Foreword
To implement the Law of the People's Republic of China on Air Pollution Prevention and Control, and regulate the waste gas treatment project of aluminum electrolysis industry
Construction and operation management of facilities, prevention and control of environmental pollution caused by exhaust gas from aluminum electrolysis, protection of the environment and human health,
Develop this standard.
This standard specifies the design, construction, acceptance and operation of fluoride electrolysis and dust control engineering for aluminum electrolysis.
Technical requirements such as maintenance.
This standard is a guidance document.
This standard is the first release.
This standard was formulated by the Science and Technology Standards Department of the Ministry of Environmental Protection.
This standard is mainly drafted by. Northeastern University, Northeastern University Design and Research Institute (Ltd), Henan
Zhongfu Industrial Co., Ltd., Shannan Nanshan Aluminum Co., Ltd., China Nonferrous Metals Industry Association.
This standard was approved by the Ministry of Environmental Protection on September 26,.2013.
This standard has been implemented since December 1,.2013.
This standard is explained by the Ministry of Environmental Protection.
Technical specifications for fluoride electrolysis and dust treatment of aluminum electrolysis
1 Scope of application
This standard specifies the design, construction, acceptance and operation of fluoride electrolysis and dust control engineering for aluminum electrolysis.
Technical requirements such as maintenance.
This standard applies to aluminum electrolysis exhaust fluoride and dust treatment projects. Can be used as an environmental impact assessment, work
The technical basis for the design, construction, acceptance and operation and management of the project.
2 Normative references
The contents of this standard refer to the terms in the following documents. A valid version of a undated reference document
This applies to this standard.
GB 4387 Safety regulations for railway and road transportation within industrial enterprises
GB 16279 Integrated emission standards for atmospheric pollutants
GB 25465 Aluminum Industry Pollutant Emission Standard
GB 50016 Building Design Fire Code
GB 50040 power machine basic design specification
GB 50046 industrial building anti-corrosion design specification
GB 50050 industrial circulating cooling water treatment design specification
GB 50051 chimney design specification
GB 50187 General Plan for Design of Industrial Enterprises
GB 50204 Concrete Structure Engineering Construction Quality Acceptance Specification
General specification for construction and acceptance of GB 50231 mechanical equipment installation engineering
GB 50683 Field equipment, industrial pipeline welding engineering construction and acceptance specifications
GB 50254 Electrical installation engineering Low-voltage electrical installation and acceptance specifications
GB 50255 Electrical installation engineering construction and acceptance specifications for power converter equipment
GB 50275 Compressor, fan, pump installation engineering construction and acceptance specifications
GB 50544 Non-ferrous metal enterprise general plan transportation design specification
Technical requirements for GB/T 6719 bag filter
GB/T 12801 General requirements for safety and hygiene of production processes
GB/T 16157 Determination of particulate matter in fixed pollution source exhaust gas and sampling method of gaseous pollutants
Classification and technical conditions of GB/T 16758 exhaust hood
GB/T 16845 Dust Collector Terminology
GB/T 17397 Aluminum Electrolysis Production Dust-proof and Anti-virus Technical Regulations
GB/T 24487 alumina
GBZ 1 industrial enterprise design hygiene standard
GBZ 2.1 Industrial sites harmful factors occupational exposure limits chemical harmful factors
HJ 477 pollution source online automatic monitoring (monitoring) data acquisition transmitter technical requirements
HJ/T 76 Fixed pollution source flue gas emission continuous monitoring system technical requirements and testing methods
HJ/T 212 pollution source online automatic monitoring (monitoring) system data transmission standard
HJ/T 254 Construction Project Completion Environmental Protection Acceptance Technical Specification Electrolytic Aluminum
HJ/T 284 electromagnetic pulse valve for bag filter
HJ/T 324 environmental protection product technical requirements filter material for bag filter
HJ/T 325 environmental protection product technical requirements bag filter bag frame
HJ/T 326 environmental protection product technical requirements film filter for bag filter
HJ/T 327 environmental protection product technical requirements bag filter bag
HJ/T 328 pulse blowing bag type dust collector
HJ/T 329 Rotary Back Blowing Bag Type Dust Collector Standard
HJ/T 330 compartment backflush bag type dust collector
JB 10191 bag filter installation requires a gas injection box for pulse jet bag type dust collector
JB/T 5915 bag type dust collector with timing pulse injection electric control instrument
JB/T 5917 filter bag frame for bag filter
JB/T 8471 bag filter installation technical requirements and acceptance specifications
JB/T 10340 bag type dust collector with differential pressure controller
3 Terms and definitions
The terms of GB/T 16845 and the following terms and definitions apply to this standard.
3.1 aluminum gas waste gas of aluminum reduction
Refers to the aluminum electrolytic cell, material transportation, material storage, anode assembly, and residual in the aluminum electrolytic industry production process.
Extreme treatment, electrolytic cell overhaul and other related equipment discharge containing gaseous hydrogen fluoride, solid fluoride salt, dioxane
A gas that oxidizes pollutants such as sulfur and dust.
3.2 filter bag service life service of bag filter
According to the requirements of GB/T 6719, the life of the filter bag refers to the batch of filter bags of each bag filter.
10% of the used filter bags are damaged or cannot be maintained for normal use (whichever occurs first)
The time of the experience.
3.3 fresh alumina fresh alumina
Refers to alumina that has not been subjected to an adsorption reaction with hydrogen fluoride gas prior to mixing with the electrolysis flue gas.
3.4 Alumina-loaded alumina enriched alumina
After mixing with the electrolysis flue gas, it reacts with hydrogen fluoride in the flue gas to contain a fluoride salt component.
Alumina.
4 Contaminants and pollution loads
4.1 Contaminants
Gaseous hydrogen fluoride, solid fluoride salt dust produced by prebaked anode aluminum electrolysis cell in aluminum electrolysis production,
Alumina dust and gaseous sulfur dioxide; gaseous hydrogen fluoride produced during anode cooling; alumina transport,
Fluoride salt transport, anode transport, anode assembly and residual pole treatment, electrolytic cell overhaul, lift bag cleaning process
Dust and so on.
4.2 Pollutant load
4.2.1 Pre-baked aluminum cell production of per ton of aluminum will produce 15 kg -40 kg of total fluorine, dust 30 kg -70 kg, dioxane
Sulfur is 4 kg -12 kg.
4.2.2 Alumina and fluoride salt delivery systems produce 30 kg -60 kg of dust per ton of aluminum produced.
4.2.3 The anode assembly workshop produces 50 kg -80 kg of dust per ton of aluminum produced.
4.2.4 Electrolytic tank overhaul and bag cleaning workshop produce 10 kg -30 kg of dust per ton of aluminum produced.
4.3 Exhaust gas quantity and exhaust gas pollutant concentration
For the characteristics of aluminum electrolysis production enterprises, the annual production capacity of aluminum electrolysis production waste gas and pollutant concentration is 10
Ten thousand tons of aluminum electrolysis production line calculation. For production enterprises with different production capacity, the actual amount of exhaust gas should be actual production.
Can be divided by a multiple of 100,000 tons of capacity.
4.3.1 The amount of exhaust gas and the concentration of pollutants in the aluminum electrolysis workshop are shown in Table B.1 of Appendix B.
4.3.2 The amount of exhaust gas and the concentration of pollutants generated by the alumina and fluoride salt delivery systems are shown in Table B.2 of Appendix B.
4.3.3 The amount of exhaust gas and the concentration of pollutants generated in the anode assembly workshop are shown in Table B.3 of Appendix B.
4.3.4 The amount of exhaust gas and the concentration of pollutants generated by overhaul and lifting of the electrolytic cell are shown in Table B.4 of Appendix B.
4.4 The removal rate of pollutants in the aluminum electrolytic waste gas treatment process should meet the requirements of Table 1.
Table 1 Design value of pollutant removal rate of aluminum electrolysis waste gas treatment process
Contaminant removal rate (%)
Category main process
Fluoride dust sulphur dioxide
Electrolytic tank gas gathering upper gas collection 98.5%
Electrolytic workshop aluminum electrolysis waste gas alumina dry purification process 97.5 98.5
Alumina and fluoride salt delivery system bag dust removal process 99.9
Anode assembly workshop bag dust removal process 99.9
Electrolytic tank overhaul and lifting bag cleaning bag dust removal process 99.9
4.5 The total air volume design allowance of the aluminum electrolysis waste gas treatment system should be 10%-15% of the original exhaust gas volume.
4.6 Exhaust gas emissions after treatment of aluminum electrolysis waste gas treatment project shall comply with the requirements of GB 25465.
4.7 The content of dust and fluoride in the air of the workshop should meet the requirements of GBZ 2.1.
5 General requirements
5.1 General provisions
5.1.1 Aluminum electrolysis production enterprises adopt various effective measures such as technological progress, production management and administrative management.
Stop the unorganized discharge of pollutants.
5.1.2 Aluminum electrolysis production engineering should meet the requirements of national industrial policies.
5.1.3 Aluminum electrolysis waste gas fluoride and dust treatment works shall comply with the provisions of this standard, and shall also comply with the state.
The current regulations on mandatory standards in engineering quality, safety and health, and fire protection.
5.1.4 Wastewater from aluminum electrolysis waste gas fluoride and dust treatment works should be discharged after treatment.
25465 and corresponding requirements for local emission standards.
5.1.5 Design and construction of aluminum electrolysis waste gas fluoride and dust treatment engineering should adopt effective sound insulation and elimination
Sound and other measures to reduce noise, noise and vibration control design should comply with the rules of GB 50087 and GB 50040
set.
5.1.6 Solid waste generated during construction and operation of aluminum electrolysis waste gas fluoride and dust treatment engineering should be classified
Collection and utilization, no reuse value should be safely disposed.
5.1.7 The enterprise shall use the fluoride and dust control facilities as part of the production system to uniformly deploy personnel.
Operation, management, maintenance, etc.
5.2 Construction scale
5.2.1 Aluminum electrolysis waste gas fluoride and dust treatment engineering construction scale should be based on aluminum electrolysis production scale and process
Reasonable matching. The control level of pollutants should meet the requirements of GB 25465.
5.3 Engineering composition
5.3.1 Aluminum electrolysis waste gas fluoride and dust treatment engineering according to the nature of the exhaust gas, combined with economic principles, select
A pollution source is configured with a separate treatment method for a purification system, or a plurality of pollution sources are configured with a purification system.
Centralized governance. Exhaust gases containing contaminants of different nature should be treated separately.
5.3.2 Aluminum electrolysis waste gas fluoride and dust treatment engineering according to the type of waste gas generated and the production process
Divided into. aluminum electrolysis waste gas treatment project, waste gas treatment of material storage and transportation system, waste gas treatment in anode assembly workshop
Management, exhaust gas treatment in the overhaul workshop and waste gas treatment in the lifting and cleaning workshop.
5.3.3 Aluminum electrolysis waste gas treatment adopts the method of centralized treatment. The governance system includes. collecting hood, exhausting smoke
Pipe network, alumina adsorption reactor, bag filter, exhaust fan, chimney, material conveying system, continuous supervision
Measurement and control systems, electrical and control systems, compressed air supply systems, water supply systems, etc.
5.3.4 Auxiliary facilities for aluminum electrolysis waste gas treatment projects include. compressed air, thermal insulation facilities, cooling water systems,
Substation, control room, etc.
5.3.5 Waste gas treatment facilities of material storage and transportation system Alumina discharge dust removal system and fluoride salt in material warehouse
Discharge dust removal system, fresh alumina silo dedusting system, fluorine-containing alumina silo dedusting system, fluoride salt storage
Warehouse dust removal system and electrolyte silo dust removal system.
5.3.6 The exhaust gas treatment facilities of the anode assembly workshop include. dust removal system at the loading and unloading station, electrolyte cleaning and dust removal system,
Electrolyte hopper discharge dust removal system, electrolyte lifting and crushing dust removal system, residual pole shot blasting system, residual
Extreme pressure dedusting system, phosphorus iron ring pressure removal and cleaning dust removal system, steel claw shot blasting and guide rod cleaning and dust removal system,
Guide rod cleaning and dust removal system, residual pole crushing and dust removal system, residual pole storage dust removal system, phosphorus pig iron furnace dust removal
System, phosphorus pig iron casting station dust removal system and steel claw drying and dust removal system.
5.3.7 The exhaust gas treatment facilities of the overhaul workshop are. the electrolysis tank overhaul planing area dedusting system.
5.3.8 The exhaust gas treatment facilities of the lifting and cleaning workshop are. dust removal system in the lifting and cleaning area, and in addition to the aluminum cleaning area
Dust system.
5.3.9 Waste gas treatment of material storage and transportation system, waste gas treatment in anode assembly workshop, and waste gas treatment in overhaul workshop
The exhaust gas treatment of the rational and lifting package cleaning workshop generally adopts a single dust purification system. The system includes. a gas collecting hood,
Smoke exhaust system, bag filter, exhaust fan, exhaust pipe, electrical and control system.
5.4 General layout
5.4.1 The general layout should comply with the relevant provisions of GB/T 17397.
5.4.2 There should be transport passages and fire exits around the main equipment, and meet GB 50544, GB 4387 and
Requirements for design specifications such as GB 50016.
5.4.3 The principle that the location of the exhaust gas treatment facility should be close to the source of the pollution should be followed. Aluminum electrolytic waste gas purification facility
Built between two electrolysis plants in the same series; other waste gas treatment facilities are built at the point of collection with exhaust gas
Near the factory or suitable for installation.
5.4.4 There should be sufficient installation and maintenance space between the main equipment of the exhaust gas treatment facility.
5.4.5 The working equipment should be equipped with the working conditions of the tower crane or the car crane.
6 Process design
6.1 General requirements
6.1.1 Aluminum electrolysis production process All equipment and facilities for generating dust and harmful gases shall be provided with a gas collecting hood and
Purification system. Production system powder material transportation should choose closed transportation mode, such as dense phase transportation, super concentrated phase transmission
Delivery, tubular belt transport, etc. Block materials such as anodes, residual poles, and electrolyte blocks transported by vehicles should be dust-proof
cover.
6.1.2 Exhaust gas centralized treatment system The gas collection pipe network shall be calculated for the resistance balance of the pipe network system, and the appropriate pipe shall be selected.
Road section.
6.1.3 Aluminum electrolysis exhaust gas purification should choose two-stage purification or other high-efficiency reaction process. Two stages of purification should be fluorine
Alumina is preferentially added to the flue gas with a high concentration of hydrogen fluoride to complete a reaction; fresh alumina is added to a low concentration of fluorination
The flue gas of hydrogen completes the second reaction.
6.1.4 The parameters of the flue gas working conditions at the inlet of the bag filter should be known. Including. working condition smoke volume, flue gas temperature and
Fluctuations (highest temperature of flue gas, minimum temperature of flue gas and dew point temperature), dust concentration of flue gas, composition of smoke and
The dust particle size of the flue gas.
6.1.5 Aluminum electrolysis exhaust gas purification system Before the bag filter, dust pre-separation facilities should be installed.
6.1.6 For the treatment of aluminum electrolysis waste gas, a large combined bag filter set should be used as the dust removal facility.
6.1.7 Aluminum electrolysis waste gas treatment system needs to choose two or more fans to be used in parallel.
6.1.8 Material handling system, anode assembly workshop, overhaul workshop and lifting package cleaning workshop, equipment cloth
It is advisable to concentrate dust removal in a centralized and basically simultaneous operation with the same pollutants; vice versa.
6.1.9 Aluminum purification waste gas purification system and material storage and transportation, anode assembly, electrolytic cell overhaul, lifting bag cleaning
The dust removal system should adopt a negative pressure purification system with mechanical forced ventilation.
6.1.10 The bypass pipe shall not be provided in the aluminum electrolysis waste gas treatment system.
6.2 Routing options
6.2.1 The flue gas treatment in the aluminum electrolysis workshop should adopt the dry purification method using alumina as the adsorbent of aluminum electrolysis raw material.
Art, it is advisable to use two-stage dry purification process (see Figure 1) or other high-efficiency adsorption purification process.
Purified flue gas
Once loaded aluminum fluoride
Smoke
Secondary alumina
Splitter
Discharge
Alumina
Metering
Smoke
Chute
reactor
Bag filter
Hoist
Fluorine-containing alumina warehouse
Chimney induced draft fan exhaust pipe pre-baked anode electrolyzer
Figure 1 Two-stage dry purification process
6.2.2 Material handling system, anode assembly workshop, electrolytic cell overhaul workshop and lift bag cleaning workshop
The waste gas treatment should adopt the bag dust removal process. The typical process flow chart of the dust removal system is shown in Figure 2.
6.2.3 The bagged material warehouse shall be provided with a dust hood on the hopper of the bag unloading. Dust collection during bag unpacking
Concentrated feeding is handled by a bag filter set outside the material warehouse. Divided into alumina according to the type of raw materials
Dust system and fluoride salt dedusting system.
6.2.4 The material storage silo of the intermediate storage function of the material conveying system should be set with dust removal from the top of the warehouse, and the dust collector should be collected.
The collected materials go directly into the silo.
Figure 2 bag dust removal system process
6.3 Equipment selection design
6.3.1 Gas collecting hood
6.3.1.1 The design of the gas collecting hood shall meet the requirements of GB/T 16758.
6.3.1.2 The gas collecting hood of the aluminum electrolytic cell should be a combined, fully enclosed gas collecting hood. The collecting hood of the aluminum electrolytic cell is composed of a flue gas passage,
The horizontal cover plate and the movable open side groove cover plate are composed. The structure should be preferred to the upper exhaust method, smoke exhaust
The road design should have flue prevention measures.
6.3.1.3 The electrolytic cell should adopt two or more sections of flue partition high-level gas gathering, and the gas gathering efficiency should be no less than 98.5%.
6.3.1.4 The design of the movable trough cover plate of the electrolyzer should control the gap between the cover plates within 2mm, the anode guide rod and water
A sealing ring is arranged between the flat hoods.
6.3.1.5 Gas hood structure design and purification system The pumping design shall control the negative pressure in the gas collecting hood to be greater than
-10 Pa, the negative pressure is distributed in the range of -10 Pa to -30 Pa.
6.3.1.6 The newly developed aluminum electrolytic cell hood structure shall be air flow according to the structural size of the gas collecting hood.
Body Dynamics Simulation Computation Software (CFD) simulates the calculation of the negative pressure at the outlet of the collector hood when no harmful gas is spilled.
Single tank exhaust.
6.3.1.7 The design air volume of the gas collecting hoods of different capacity aluminum electrolytic cells can also be determined according to the actual measurement and analogy, or
Equation (1) is used for estimation.
Q=2000 18.95I-0.006I2 (1)
In the formula.
Q -- Electrolytic tank hood design smoke exhaust, Nm3/h
I -- Cell capacity, kA
6.3.1.8 For the hood structure of the exhaust duct above the horizontal hood, the outlet negative pressure should be greater than -200Pa;
The collector hood structure below the horizontal hood should have an outlet negative pressure greater than -400Pa.
6.3.1.9 Use the design of the existing aluminum electrolytic cell geometry and the hood structure, except for the reference to 6.3.1.6 and 6.3.1.8
In addition to the calculation, the negative pressure and the amount of smoke exhausted from the outlet of the collecting hood should be determined in conjunction with actual measurements.
6.3.1.10 When the aluminum electrolysis cell is subjected to the process operation, when the trough cover is opened, the amount of exhaust air should be expanded to the normal exhaust volume.
More than twice; the negative pressure at the outlet of the collector hood should also rise to more than twice the normal negative pressure.
6.3.1.11 Material handling system, anode assembly workshop, electrolytic cell overhaul workshop and lift bag cleaning workshop
The gas collecting hood shall have a gas collecting efficiency of not less than 97% for the exhaust gas, and its structural form shall be convenient for installation, disassembly and process.
operating.
6.3.1.12 The setting of the gas collecting hood shall meet the requirements of post labor hygiene, and the installation position shall be correct, close to the dust source.
The hood faces the direction in which harmful gases and dust are emitted.
6.3.1.13 The amount of air entering the hood from the environment should be appropriate. Inhaled by the gap between the equipment (facility) and the hood edge
The flow rate of the ambient air should be controlled at 0.25-0.5 m/s.
6.3.1.14 The setting of the suction vent of the gas collecting hood shall ensure that the gas at each point in the gas collecting hood flows to the suction port, and must be pumped at a certain point.
Under the gas volume, all points are guaranteed to be negative pressure. The suction port should not be placed near the area where the material is in agitated state. for
For powdery materials, the wind speed of the suction hood of the gas collecting hood is about 1m/s; for the bulk material, the air of the suction section
The speed should be no more than 3m/s.
6.3.2 Exhaust pipe network
6.3.2.1 In addition to the connection port, the duct shall have a circular cross section.
6.3.2.2 Wind speed inside the duct. 8-12m/s for vertical pipelines and 12-16m/s for inclined pipelines, horizontal pipelines
Should take 16-20m/s.
6.3.2.3 The duct path should adopt a low-resistance design to minimize the bend. The radius of the bend is taken as R=(1.5-3) D (D
For duct diameter or equivalent diameter).
6.3.2.4 Aluminum electrolysis exhaust gas dry purification system, between the exhaust port of the electrolysis tank and the exhaust pipe network, the air duct and dust removal
A telescopic joint should be installed between the inlet and outlet flanges of the device and between the air duct and the fan.
6.3.2.5 Aluminum electrolysis exhaust gas purification system exhaust pipe network at the outlet of the collector hood of the electrolyzer, dust removal system in the pipeline
Valves should be installed in the appropriate parts and before the fan.
6.3.2.6 The arrangement of the exhaust pipe shall prevent the accumulation of ash in the pipeline. It is advisable to set the cleaning hole and take anti-leakage
Measures.
6.3.2.7 Where the duct is flanged, a gasket shall be provided at the flange joint. The duct itself should be welded strictly
quality.
6.3.2.8 The inlet pipe of the dust collector shall be provided with a permanent sampling hole and a sampling test platform. Sampling hole should be consistent
GB/T 16157.
6.3.2.9 It is advisable to add an auxiliary exhaust pipe network specially designed for exhausting smoke when the aluminum electrolytic cell is opened, that is, the exhaust pipe network should be set
It is counted as a double exhaust pipe network.
6.3.2.10 The wind speed of the aluminum tube of the aluminum electrolytic cell is 8-12m/s, and the wind speed of the integrated pipe is 16-18m/s, the total pipe
The wind speed is 18-20m/s.
6.3.2.11 After determining the wind speed of the cigarette pipe and summing up the wind speed of the pipe, the wind is collected when the pipe is connected to each pipe.
The principle of increasing the speed equally (increasing Δυ) determines the diameter of each variable diameter section of the smoke pipe.
△υ=(υ汇υυ)/n (2)
In the formula.
υ汇-- Summary of the maximum flow rate of the pipe m/s
υ支-- cigarette flow rate m/s
n -- the number of single side summary pipes
6.3.2.13 The summary of the auxiliary exhaust pipe is a constant diameter pipe, and the pipe diameter design shall follow the smoke specified in 6.3.2.10.
The design principle of the flow rate control value, the amount of smoke of the auxiliary exhaust pipe is considered as 10% of the total amount of flue gas treated by the system.
6.3.2.14 The main exhaust pipe network and the auxiliary pipe of the auxiliary exhaust pipe network are provided with regulating valves, and the opening control of the valves
The system is incorporated into the control and management of the aluminum electrolytic cell slot machine, and the two valves cannot be opened at the same time.
6.3.2.15 The air duct shall be treated with corresponding anti-corrosion treatment.
6.3.3 Reactor
6.3.3.1 The structural form of the reactor shall ensure that the mixing of alumina and flue gas is sufficient and uniform for alumina
Low damage and low system resistance.
6.3.3.2 The amount of fresh alumina added should not exceed the actual amount of electrolytic production, and the circulating amount of alumina
To ensure purification efficiency is appropriate.
6.3.3.3 Fresh alumina shall be provided with a filter screen before entering the reactor.
6.3.3.4 Fresh alumina and recycled alumina should be added smoothly and evenly. Fresh alumina and cyclic oxidation
A shut-off detection device shall be provided for the pipe into which the aluminum enters the reactor.
6.3.3.5 The configuration of the reactor and the flue gas pipeline should facilitate the maintenance of the reactor.
6.3.4 Dust collector
6.3.4.1 The aluminum electrolysis waste gas treatment adopts a bag type dust collector, and the cleaning method is preferred to use the pulse injection method.
6.3.4.2 The air volume of the bag filter shall be calculated according to 1.1 times the amount of exhaust gas to be treated by the purification system.
6.3.4.3 The net filtration wind speed of the filter bag can be determined according to the type of bag filter, the type of filter material and the dust emission requirements of the outlet.
And other process conditions to choose. Pulse jet bag filter, recommended net filter wind speed 1.0-1.5m/min, when export
When the dust concentration requirement is less than 5mg/m3, the net filtration wind speed should not exceed 0.9m/min, and the non-coated filter material is backflushed.
For air bag filters, the net filter wind speed should not exceed 0.8m/min.
6.3.4.4 The choice of filter media and filter wind speed should be from investment, purification effect, system operation energy consumption, oxygen
A comprehensive economic evaluation was carried out on the loss of aluminum, and finally the economically reasonable filter material and filtration wind speed were determined.
6.3.4.5 Aluminum electrolysis exhaust gas purification system, filter wind speed using a needle felt filter material is selected at 0.8
The range of m/min-1.0m/min; the filter wind speed of the dust collector using the membrane filter is selected at 1.0 m/min-1.2
The range of m/min.
6.3.4.6 The net filtration area shall be calculated according to the net filtration wind speed, which shall be selected by the net filtration area and the total filtration area.
The size and quantity of the dust collector.
6.3.4.7 Pressing the bag filter to measure air volume, net filter wind speed, net filter area, and total filter area
Calculation.
(3)
In the formula.
Q--treatment air volume of bag filter, m3/h;
S net - net filtration area, m2;
S total - total filtration area, m2;
S clear - the filter bag area of the cleaning unit, m2.
V--net filtration wind speed m/min;
6.3.4.8 The dust collectors installed in the open air shall be provided with rainproof facilities to prevent rainwater from infiltrating and affecting the operation or equipment life.
6.3.4.9 The gas source for pulse cleaning should be the gas source of the factory compressed air pipe network. If the compressed air is dedicated,
The compressed air pressure is determined according to the design requirements.
6.3.5 Exhaust fan
6.3.5.1 The air volume of the exhaust fan should be 1.1-1.15 times of the air volume of the dust collector, and the total pressure of the indenter is 1.2.
Times.
6.3.5.2 The operating parameters of the exhaust fan should be corrected according to the working conditions, so that the operating point of the fan is exhausted.
The economy of the machine is used. The actual operating parameters of the exhaust fan should be converted according to the following formula.
Full pressure.
(4)
Flow rate Q1=Q0
Effective power.
(5)
In the formula.
H0--rated full pressure, Pa;
Q0--rated flow, m3/h;
N0--rated effective power, kW;
T0--rated working temperature, °C;
P1--actual inlet pressure, Pa;
T1--actual inlet temperature, °C;
H1--actual full pressure, Pa;
Q1--actual flow, m3/h;
N1--actual effective power, kW.
6.3.5.3 When the fan speed needs to be adjusted to meet the requirements of the system resistance, the full pressure and flow of the fan at the working point
The amount and shaft power are calculated as follows, and the fan specifications are selected in combination with the first three formulas.
(6)
(7)
(8)
In the formula.
Nl--the adjusted fan speed;
N0--the rated speed of the fan;
6.3.5.4 The ventilating door shall be provided at the entrance of the exhaust fan, and the opening of the damper may be adjusted in the control room.
6.3.5.5 The arrangement of the inlet and outlet ducts of the exhaust fan shall meet the requirements of smooth flow of flue gas and high efficiency of operation of the fan.
6.3.5.6 A shut-off valve shall be provided on the inlet and outlet pipes of the exhaust fan to facilitate the maintenance of the fan.
6.3.5.7 Exhaust fan inlet and outlet pipes.
   
 
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