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DL/T 1967-2019: Technical specification for flue gas cleaning system of waste-to-energy plant
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Technical specification for flue gas cleaning system of waste-to-energy plant
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DL/T 1967-2019
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Basic data | Standard ID | DL/T 1967-2019 (DL/T1967-2019) | | Description (Translated English) | Technical specification for flue gas cleaning system of waste-to-energy plant | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | F19 | | Word Count Estimation | 14,164 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Quoted Standard | GB/T 16157; GB 18485; GB 50264; HJ 75; HJ 76; HJ 2012 | | Regulation (derived from) | Natural Resources Department Announcement No. 7 of 2019 | | Issuing agency(ies) | National Energy Administration | | Summary | This standard specifies the technical requirements for deacidification, dust removal, heavy metal and dioxin adsorption, and denitrification of the flue gas purification system of waste-to-energy power plants. This standard applies to the flue gas purification system of newly built, renovated and expanded household waste incineration power plants. The projects of waste incineration plants without power generation can be implemented by reference. | DL/T 1967-2019: Technical specification for flue gas cleaning system of waste-to-energy plant---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Technical specification for flue gas cleaning system of waste-to-energy plant
ICS 27.180
F 19
People's Republic of China Electric Power Industry Standard
Technical specification for flue gas purification system of waste-to-energy plant
Refractory materials for boilers in thermal power plants
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...II
1 Scope...1
2 Normative references...1
3 Terms and definitions...1
4 Basic regulations...2
5 Smoke volume and harmful components...2
6 Deacidification process...2
7 Dust removal process...5
8 Heavy metals and dioxin removal process...5
9 Denitration process...7
10 On-line monitoring of flue gas pollutants...9
Appendix A (Informative Appendix) Calculation of Smoke Volume...10
Appendix B (informative appendix) filter area and filter bag calculation...11
Foreword
This standard is in accordance with GB/T 1.1-2009 "Guidelines for Standardization Part 1.Standard Structure and Compilation"
Drafting of rules.
Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.
Ren.
This standard was proposed and managed by the China Electricity Council.
The organization responsible for drafting this standard. China Enfi Engineering Technology Co., Ltd., Wuxi Huaxing Dongfang Power Environmental Technology Co., Ltd.
Limited company, China Electric Power Development Promotion Association.
Participated in the drafting of this standard. Shanghai Environment Group Co., Ltd., Shanghai Lingqiao Environmental Protection Equipment Factory Co., Ltd., Zhejiang
Jiangfeida Technology Development Co., Ltd., Hefei Cement Research and Design Institute, Beijing High Energy Times Environmental Technology Co., Ltd.,
Hubei Yidu Yunji Electromechanical Co., Ltd., Tianjin TEDA Environmental Protection Co., Ltd.
The main drafters of this standard. Chen Dexi, Peng Xiaorong, Pan Kerong, Wu Haolun, Liu Yinghua, Liu Haiwei, Zhang Wenkun,
Liu Zhe, An Miao, Zhou Diaozhong, Wu Gang, Zhen Shengli, Huang Lei, Tang Wanjun, Liu Yanbo, Shi Deyun, Gao Xigang, Wang Chuanping,
Liu Zhongyi, Yang Qing, Gu Liujun, Li Xiaobao, Wang Zhixing, Liu Huaming, Liang Mei, Gao Yuping, Zhang Yinghua, Liu Chun, Song Xuan
Jin, Shi Yong, Zhou Shaochun, Wang Difei, Gu Lin, Dai Ruifeng, Gao Jinsong.
This standard is issued for the first time.
The opinions or suggestions during the implementation of this standard shall be fed back to the Standardization Management Center of the China Electricity Council (Northern
No. 1, Ertiao, Baiguang Road, Beijing, 100761).
Technical specification for flue gas purification system of waste-to-energy plant
1 Scope
This standard specifies the process aspects of deacidification, dust removal, heavy metal and dioxin adsorption, and denitrification of the flue gas purification system of waste-to-energy plants
skills requirement.
This standard applies to the flue gas purification system of newly built, renovated and expanded household waste incineration power plants. Waste incineration plant waste heat without power generation project
Can refer to implementation.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this
file. For undated references, the latest version (including all amendments) applies to this document.
GB/T 16157 Determination of particulate matter in emissions from stationary sources and sampling method for gaseous pollutants
GB 18485 Standard for pollution control of domestic waste incineration
GB 50264 Industrial equipment and pipeline insulation engineering design code
HJ/T 75 Technical Specification for Continuous Monitoring of Smoke Emissions from Stationary Pollution Sources (Trial)
HJ/T 76 Technical requirements and testing of continuous monitoring system for flue gas emissions from stationary sources (for trial implementation)
HJ.2012 Technical Specification for Garbage Incineration Bag Dust Removal Engineering
3 Terms and definitions
3.1
Semi-dry deacidification of flue gas
When removing acidic pollutants in the flue gas, the added neutralizing agent enters the deacidification system in a liquid or high water content form. The neutralizing agent
A process in which the reactants obtained after reacting with the acidic pollutants in the flue gas in a wet environment are discharged in the form of solid or dry matter.
3.2
Dry deacidification of flue gas
When removing acidic pollutants in the flue gas, the added neutralizer enters the deacidification system in a solid form, and the neutralizer interacts with the acid in the flue gas.
A process in which the reactants obtained after the reaction of sexual pollutants in a dry environment are also discharged in solid form.
3.3
Wet deacidification of flue gas
When removing the acid gas in the flue gas, the added neutralizer enters the deacidification system in liquid form. The neutralizer and the acid in the flue gas
A process in which the reactants obtained after the pollutants react in a wet environment are also discharged in liquid form.
3.4
Activated carbon adsorbent
Spray a certain amount of powdered activated carbon in the flue gas pipeline in front of the dust collector or other locations to adsorb dioxins and harmful heavy substances in the flue gas.
Contaminants such as metals.
3.5
Dry power absorbent
Spray a certain amount of solid neutralizer in front of the dust collector or in the flue gas pipeline at other locations to neutralize the acidic pollutants in the flue gas.
4 Basic regulations
4.1 The emission indicators of various pollutants in the purified flue gas should meet GB 18485 and local environmental protection requirements, and should meet the requirements of domestic waste incineration.
The requirements for the approval of the environmental impact assessment report of the burning power plant and the total pollutant discharge requirements.
4.2 Each incinerator shall be equipped with an independent flue gas purification system.
4.3 The flue gas purification system should select a reasonable flue gas treatment process based on pollutant emission indicators, garbage characteristics, incineration technology, and flue gas characteristics.
art.
4.4 The flue gas purification system should include deacidification system, activated carbon adsorption and dust removal system, denitration system, etc.
4.5 Except for the selective catalytic reduction denitrification system and the wet deacidification system, the flue gas purification system should not be provided with a bypass system.
4.6 Each set of flue gas purification production line should be equipped with a separate flue gas online monitoring device, monitoring point layout, monitoring instrumentation, data processing and transmission
It shall meet the requirements of HJ/T 75 and HJ/T 76, and the test content shall meet the requirements of GB 18485, and shall be in accordance with the local environmental protection administration
The monitoring center of the competent department is connected to the Internet.
4.7 The flue gas purification system should take anti-corrosion measures according to the characteristics of the flue gas; when the surface temperature of the equipment and pipes exceeds 50℃, it should be insulated.
It should meet the requirements of GB 50264; the equipment and pipes should take wear-resistant measures according to the dust content and characteristics.
4.8 The flue gas purification system should be incorporated into the plant-wide distributed control system (DCS); when the flue gas purification system adopts a separate programmable logic control
During PLC control, important control data should be uploaded to the plant-wide distributed control system (DCS), and all equipment should be able to be distributed
Type Control System (DCS) for emergency stop.
4.9 The flue gas purification system should set temperature, pressure, flow, liquid level and other detection and control data at the entrance and exit of each important equipment.
5 Smoke volume and harmful components
5.1 Flue gas volume and flue gas temperature
5.1.1 The amount of flue gas should be calculated based on the design calorific value of the waste, the amount of incineration into the furnace and the characteristics of the waste. For the calculation method, see Appendix A.
5.1.2 The designed flue gas temperature at the inlet of the flue gas purification system should be the highest actual operating temperature of the boiler outlet under the maximum continuous working condition (MCR) of the incinerator.
5.2 Determination of pollutant components in flue gas
The pollutant components in the flue gas are particulate matter, sulfur dioxide, hydrogen chloride, nitrogen oxides, mercury, lead, cadmium, chromium, arsenic and other heavy metals,
Dioxins and carbon monoxide.
6 Deacidification process
6.1 General provisions
6.1.1 The flue gas deacidification process should be based on factors such as the initial concentration of pollutants, emission limits, and the removal efficiency of various processes.
A combination of processes.
6.1.2 Wet deacidification should be equipped with facilities for regular discharge of circulating fluid, lye supplementation and treatment of reaction by-products, etc., and flue gas should be installed after deacidification
For the de-whitening process, the flue gas de-whitening should be based on the temperature, humidity and other factors of the project site to select equipment and control operating parameters.
6.1.3 The concentration of sulfur dioxide (SO2) and hydrogen chloride (HCl) in the flue gas after deacidification and the temperature of the flue gas at the outlet of the deacidification reaction tower should be
Chain control of the amount of neutralizer in the acid reaction tower.
6.2 Semi-dry deacidification
6.2.1 Semi-dry deacidification includes mechanical rotary spray method, fixed gun two-phase flow spray method, etc. The system includes neutralizer preparation and delivery system,
Deacidification reaction tower system.
6.2.2 The preparation of neutralizer should meet the following requirements.
a) The neutralizer should be slaked lime, sodium bicarbonate or sodium alkali, and the capacity of the neutralizer storage tank should be based on the plant's consumption, transportation conditions and supply
Factors such as cargo conditions are determined;
b) The neutralizer storage tank should be equipped with arch breaking and dust suppression devices;
c) The neutralizer storage tank should have level detection and metering devices;
d) The particle size and purity of the pulping powder should meet the design requirements. The slurry volume and slurry concentration should be based on the acid gas concentration and reaction in the flue gas.
Determine the efficiency and boiler exhaust temperature;
e) The slurry system should be equipped with slurry tank and slurry storage tank.
6.2.3 The neutralizer delivery system shall meet the following requirements.
a) There should be at least two neutralizing agent slurry pumps in the whole plant, one of which is for standby. The neutralizer that is insoluble in water should also be resistant to
Wear measures
b) The slurry supply of each neutralizer supply pump can be used separately for multiple incineration lines at the same time (but not more than 4 lines), and at least
200% margin (when the consumption of a single line is large and there are more than 3 incineration lines used at the same time, the margin can be appropriately reduced), more
The remaining slurry is returned to the slurry storage tank through the return pipe, and a pressure regulator valve is arranged on the return pipe.
6.2.4 The deacidification reaction tower system shall meet the following requirements.
a) The material of the deacidification reaction tower should adopt heat-resistant, thermal expansion, anti-blocking and anti-wear measures to facilitate maintenance and repair, and set up necessary platforms
Escalator, observation hole, access door;
b) The inlet and outlet of the deacidification reaction tower should be equipped with compensators to absorb the axial thermal expansion caused by the incinerator, deacidification reactor and flue gas duct.
Displacement, radial displacement, angular displacement and vibration;
c) The deacidification reaction tower should be equipped with a flue gas distributor;
d) The residence time of the flue gas in the deacidification reaction tower should be greater than the time required for the water in the neutralizer to completely evaporate;
e) The particle size of the neutralizer droplets after the atomization of the mechanical rotary atomizer or the fixed gun two-phase flow atomization spray gun should meet the requirement of complete liquid evaporation.
begging;
f) In the fixed gun two-phase flow process, when one neutralizer supply pump supplies multiple deacidification reaction towers at the same time, each reaction tower should
Separately equipped with 1 set of neutralizer regulating device and back pressure return pipeline;
g) The diameter of the deacidification reaction tower with fixed gun two-phase flow atomization should be based on the flue gas flow, residence time, spray gun atomization body diameter, etc.
Considering many factors comprehensively, the atomizer should be able to cover the cross section of the reaction tower, and at the same time minimize the cross and
Avoid spraying the atomized neutralizer to the wall of the deacidification reaction tower.
6.2.5 A cooling water system should be installed in the deacidification reaction tower, and the temperature of the flue gas at the outlet of the reaction tower should be controlled below the acid dew point of flue gas 10℃～20℃
on.
6.3 Dry deacidification
6.3.1 Dry deacidification includes circulating fluidized bed (CFB) and humidified circulating ash flue gas deacidification (NID), etc. The system includes neutralizer preparation and transportation
Delivery system, deacidification reactor system, dust collector system, among which humidification circulating ash flue gas deacidification should also include humidification circulating ash system.
6.3.2 The flue gas circulating fluidized bed (CFB) deacidification process shall meet the following requirements.
a) The neutralizer preparation and delivery system should meet the following requirements.
1) The fineness of quicklime powder should be below 1mm, the temperature can be raised to 60℃ within 4min after adding water, and the content of calcium oxide (CaO)
Should not be less than 80%;
2) The fineness of the finished slaked lime powder should be less than 0.1mm, the water content should be less than 2%, and the specific surface area of the slaked lime powder should not be less than
15m/g, the purity should not be less than 90%;
3) The effective storage capacity of the neutralizing agent warehouse should be determined according to the consumption, transportation conditions and supply of the whole plant.
3d～5d consumption under continuous working condition (MCR) operating conditions;
4) The neutralizer of each flue gas purification device should be measured separately, and based on the sulfur dioxide (SO2),
Hydrogen chloride (HCl) feedback is automatically adjusted.
b) The neutralizer recirculation system should be equipped with sufficient capacity to ensure continuous return of material; the air volume and pressure of the fluidizing fan should be able to ensure the flow
Heater should be equipped to ensure the fluidizing air temperature is above the flue gas dew point;
c) The resistance of the deacidification reactor should be 800Pa～1500Pa, and the outlet flue gas temperature should be 10℃～20℃ higher than the acid dew point temperature;
The dust concentration in the reactor should be determined according to 800g/m3～1000g/m3 under standard conditions, and a separator should be installed; flue gas circulating flow
The fluidized bed system should adapt to changes in flue gas load within 50% to 110%, and clean flue gas recirculation devices should be added;
d) The filter wind speed of the dust collector system should not be greater than 0.7m/min under 100% load, and the inlet of the bag filter should be equipped with pre-dust removal facilities;
e) When adding a clean flue gas recirculation device, it should match the selection of the air pressure margin of the induced draft fan.
6.3.3 The humidification cycle ash and flue gas deacidification (NID) shall meet the following requirements.
a) The deacidification of humidified circulating ash flue gas should be composed of neutralizer storage and transportation system, deacidification reactor system, humidified circulating ash system,
For the composition of dust collector system, one furnace and one system should be set up;
b) The neutralizer storage and delivery system should meet the following requirements.
1) The purity of calcium oxide (CaO) powder should not be less than 80%, and the purity of calcium hydroxide (Ca(OH)2) powder should not be less than
85%;
2) The temperature rise of calcium oxide (CaO) powder in the first 3 minutes should not be less than 30℃;
3) The specific surface area of calcium oxide (CaO) powder should not be less than 6m2/g, and the specific surface area of calcium hydroxide (Ca(OH)2) powder should not
Less than 12m2/g;
4) The effective storage capacity of the neutralizing agent warehouse should be determined according to the consumption, supply and transportation conditions of the whole plant, and should be controlled to the maximum continuous
The consumption of 3d～5d under the operating condition (MCR).
c) The resistance of the deacidification reactor should be controlled below 1800Pa, and the flue gas temperature at the outlet of the deacidification reactor should be 10°C higher than the acid dew point temperature.
20℃; pre-dust removal facilities should be installed at the entrance of the bag filter;
d) After humidification, the circulating ash should be evenly added to the deacidification reactor; the circulating ash feed should be continuous and uniform.
6.4 Wet deacidification
6.4.1 Wet deacidification should include lye storage and supply system, wet reactor system, process water system and flue gas system.
6.4.2 Wet deacidification should be combined with semi-dry deacidification and (or) dry deacidification.
6.4.3 Sodium-alkali neutralizer should be used for wet deacidification.
6.4.4 The lye storage and supply system shall meet the following requirements.
a) The lye storage and supply system should be set up with multiple furnaces. The system consists of an alkali unloading pump, lye tank, lye transfer pump, and alkali
Liquid dilution tank, lye stirring pump and lye metering pump, etc. The lye delivery pump and metering pump should be set up for standby;
b) Anti-corrosion measures should be taken for lye storage devices, transfer pumps, pipelines, valves, etc.;
c) The capacity of the lye tank should be determined according to the consumption, transportation conditions and supply of the whole plant, and the maximum continuous working condition (MCR) of the whole plant should be adopted
4d～7d consumption under operating conditions;
d) Two lye dilution tanks, one for use and one for preparation, should not be less than the capacity of a single lye dilution tank under the design conditions of the whole plant's wet deacidification system
1d consumption;
e) The lye tank, lye transfer pump and the pipes and valves between the outlet of the transfer pump and the lye dilution pump shall be insulated with electric heat tracing.
6.4.5 The wet process reactor should take anti-corrosion measures, and the inlet flue at the wet and dry interface should take high temperature and anti-corrosion measures.
6.4.6 The process water system of the wet process reactor should adopt public facilities, including process water tanks and process water pumps. The water pumps should be set up as standby;
The reactor should be equipped with a high-level water tank.
6.4.7 The circulating pump of the wet process reactor should be set up in a public system, and at least one spare should be set.
6.4.8 The flue gas system shall meet the following requirements.
a) The flue gas system can be equipped with an induced draft fan, which can be arranged upstream or downstream of the system;
b) The heating surface of the flue gas heat exchanger should take measures such as anti-corrosion, anti-wear, anti-clogging, anti-staining, etc., and those in contact with the flue gas after deacidification
Anti-corrosion measures should be taken for the shell;
c) When the bypass flue is set, both the inlet and outlet of the deacidification device and the bypass baffle door should adopt the form of double baffles and should have good operation
And sealing performance;
d) The flue at the bottom of the flue gas heat exchanger should be equipped with a drainage system.
6.4.9 The wet deacidification flue gas system should be equipped with a flue gas heat exchanger, and the flue gas-flue gas heat exchanger (GGH) clean flue gas side outlet under the design conditions
The flue gas emission temperature should meet the local environmental assessment requirements.
6.4.10 Wet-process deacidification flue gas heat exchangers should adopt tubular heat exchangers, the air leakage rate should not be greater than 0.1%, and the material should be polytetrafluoroethylene (PTFE)
Anti-corrosion material.
7 Dust removal process
7.1 General provisions
7.1.1 A bag filter should be used for dust removal. The dust removal process and the design of the bag filter body should meet the requirements of HJ.2012;
When adding other dust removal processes and equipment, they shall comply with the technical regulations of the corresponding processes and equipment.
7.1.2 Select bag filter according to factors such as flue gas composition, dust content, temperature, flow rate, particle properties, particle size distribution and other factors
The filter material.
7.1.3 The bag filter should be equipped with a hot air circulation system, and no bypass should be provided.
7.2 Dust removal process of bag filter
7.2.1 The inlet temperature of the bag filter should be 10℃～20℃ higher than the flue gas dew point, and not higher than the highest temperature limit for continuous use of the filter material.
7.2.2 The filter material of the bag filter should be made of polytetrafluoroethylene (PTFE) as the base cloth and covered with polytetrafluoroethylene (PTFE).
7.2.3 The filter speed of the bag filter should be based on the physical and chemical properties of the flue gas and particulate matter, the concentration of particulate matter at the inlet of the filter, and the pressure of the filter
The method of dust reduction and cleaning, the concentration of harmful substances and the characteristics of the filter material are determined, which should be 0.8 m/min～0.9m/min, but this standard
Except for the specific requirements of the specified process.
7.2.4 The bag filter should be equipped with independent filter chambers, and the number should not be less than 4.The inlet and outlet of each filter chamber should be equipped with switching valves,
It also has functions such as automatic and manual, valve position recognition, and flow direction indication.
7.2.5 For calculation of bag filter area and number of filter bags, see informative appendix B.
7.2.6 The pressure difference detection device should be installed in each bin of the bag filter.
7.2.7 The dust removal method of the bag filter should adopt two control modes. differential pressure control and timing control, and they can be interchanged.
7.2.8 The bag ash hopper, ash unloading equipment and ash conveying equipment should adopt electric heating devices, and steam heating is not suitable.
7.2.9 The surface of the clean air chamber of the bag filter shall be treated with anti-corrosion.
7.2.10 For newly-built bag filters, after replacing filter bags in batches, or dust collectors that have been out of service for a long time, the filter bags should be pre-sprayed before the dust collector operates in a hot state
Painted.
7.2.11 The air-tightness test shall be carried out before the bag filter starts operation, and the air leakage rate shall not exceed 2%.
7.2.12 Fly ash transportation shall be enclosed mechanically and/or pneumatically conveyed, and manpower and open containers shall not be used.
8 Removal process of heavy metals and dioxins
8.1 General provisions
8.1.1 The adsorption system for heavy metals and dioxins includes activated carbon storage bins, metering devices...
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