HJ 562-2010_English: PDF (HJ562-2010)
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Engineering technical specification of flue gas ive catalytic reduction denitrification for thermal power plant
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HJ 562-2010
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| Standard ID | HJ 562-2010 (HJ562-2010) | | Description (Translated English) | Engineering technical specification of flue gas ive catalytic reduction denitrification for thermal power plant | | Sector / Industry | Environmental Protection Industry Standard | | Classification of Chinese Standard | Z25 | | Classification of International Standard | 13.040.40 | | Word Count Estimation | 26,299 | | Date of Issue | 2010-02-03 | | Date of Implementation | 2010-04-01 | | Quoted Standard | GB 150; GB 536; GB 2440; GB 12348; GB 12801; GB 14554; GB 18218; GB 50016; GB 50040; GB 50160; GB 50222; GB 50229; GB 50351; GBJ 87; GB/T 16157; GB/T 20801; GB/T 21509; GBZ 1; DL 5009.1; DL 5053; DL/T 5032; DL/T 5121; DL/T 5136; DL/T 5153; HJ/T 75; HJ/T 76; HG/T 20649; SH 3007 | | Drafting Organization | China Environmental Protection Industry Association | | Regulation (derived from) | Department of Environmental Protection Notice No. 14 of 2010 | | Summary | This standard specifies the selective catalytic reduction of thermal power plant flue gas denitration engineering design, construction, commissioning, operation and maintenance of the technical requirements to be followed, as environmental impact assessment, engineering design and construction, environmental acceptance and completion of project completion after the operation and management of the technical basis. This standard applies to the unit capacity of 200MW and above power plant coal, gas, oil-fired boiler construction or have been built over the same period the boiler flue gas denitrification. The following unit capacity 200MW coal-fired, gas-fired, oil-fired boilers and other industrial boilers, furnaces, construction or have been built over the same period the boiler flue gas denitrification projects, reference may be executed. | HJ 562-2010
Engineering technical specification of flue gas ive catalytic reduction denitrification for thermal power plant
National Environmental Protection Standard of the People's Republic
Technical specification for flue gas denitration engineering of thermal power plants
Selective catalytic reduction
Engineering technical specification of flue gas selective catalytic reduction
Denitration for thermal power plant
Published on.2010-02-03
2010-04-01 Implementation
Ministry of Environmental Protection released
Ministry of Environmental Protection
announcement
No. 14 of.2010
To implement the Environmental Protection Law of the People's Republic of China, the Law of the People's Republic of China on Prevention and Control of Atmospheric Pollution, and the Water
The Law on Pollution Prevention and Control, which regulates the construction and operation of pollution control projects, is now approved for the selective catalytic catalysis of the technical specifications for flue gas denitrification in thermal power plants.
The three standards, such as the original law, are national environmental protection standards and are issued.
The standard name and number are as follows.
2. Technical specification for flue gas denitration engineering of thermal power plants. selective non-catalytic reduction method (HJ 563-2010);
3. Technical Specifications for Leachate Treatment in Domestic Waste Landfills (Trial) (HJ 564-2010).
The above standards have been implemented since April 1,.2010 and published by the China Environmental Science Press. The standard content can be found on the website of the Ministry of Environmental Protection.
Special announcement.
February 3,.2010
Content
Foreword..iv
1 Scope..1
2 Normative references..1
3 Terms and definitions. 2
4 pollutants and pollution load. 2
5 General requirements..3
6 Process Design..4
7 Main process equipment and materials 8
8 Detection and Process Control..8
9 auxiliary system..9
10 Labor Safety and Occupational Health..10
11 Construction and acceptance 10
12 Operation and Maintenance 11
Appendix A (informative appendix) Typical system flow of urea ammonia system..13
Appendix B (informative) Basic data for catalyst design selection 15
Appendix C (informative) Treatment of spent catalysts.17
Appendix D (informative) Performance Correction Curve Example 19
Appendix E (informative appendix) Denitration system parameter detection table 21
Iv
Foreword
To implement the Environmental Protection Law of the People's Republic of China, the Law of the People's Republic of China on Prevention and Control of Atmospheric Pollution, and the Air Pollution of Thermal Power Plants
Dust emission standards, regulate the construction of flue gas denitrification projects in thermal power plants, improve the quality of the atmospheric environment, and develop this standard.
This standard stipulates the technical requirements for the design, construction, acceptance, operation and maintenance of the flue gas denitrification project in the selective catalytic reduction of thermal power plants.
begging.
This standard was formulated by the Science and Technology Standards Department of the Ministry of Environmental Protection.
This standard is the first release.
This standard is mainly drafted by. China Environmental Protection Industry Association, Southeast University, Beijing Municipal Environmental Protection Research Institute, Xi'an Thermal Power
Research Institute Co., Ltd., State Grid Power Technology Company, Beijing Boqi Power Technology Co., Ltd., Beijing Guodian Longyuan Environmental Protection Engineering Co., Ltd.
Tsinghua Tongfang Environmental Co., Ltd., Zhejiang Tiandi Environmental Protection Engineering Co., Ltd.
This standard was approved by the Ministry of Environmental Protection on February 3,.2010.
This standard has been implemented since April 1,.2010.
This standard is explained by the Ministry of Environmental Protection.
Technical specification for flue gas denitration engineering of thermal power plants
Selective catalytic reduction
1 Scope of application
This standard stipulates the design, construction, acceptance, operation and maintenance of the flue gas denitrification project of thermal power plant selective catalytic reduction.
Technical requirements, can be used as environmental impact assessment, engineering design and construction, project completion environmental protection acceptance and operation and management after completion
in accordance with.
This standard is applicable to smoke from coal-fired, gas-fired, and oil-fired boilers with a capacity of.200 MW or above.
Gas denitration project. Coal, gas, oil-fired boilers and other industrial boilers and furnaces with unit capacity below.200 MW
When building a boiler flue gas denitration project, it can be referred to.
2 Normative references
The contents of this standard refer to the terms in the following documents. For undated references, the valid version applies to this standard.
GB 150 steel pressure vessel
GB 536 liquid anhydrous ammonia
GB 2440 urea
GB 12348 industrial enterprise boundary noise emission standard
General rules for safety and health requirements of GB 12801 production process
GB 14554 Odor Pollutant Discharge Standard
GB 18218 Identification of major hazard sources of hazardous chemicals
GB 50016 Building Design Fire Code
GB 50040 power machine basic design specification
GB 50160 Petrochemical Enterprise Design Fire Protection Code
GB 50222 Building interior decoration design fire protection specification
GB 50229 Fire power plant and substation design fire protection specification
GB 50351 Tank design fire protection design code
GB J 87 Industrial Enterprise Noise Control Design Specification
GB/T 16157 Determination of particulate matter in fixed pollution source exhaust gas and sampling method of gaseous pollutants
GB/T 20801 Pressure Pipeline Specification Industrial Pipeline
GB/T 21509 coal-fired flue gas denitration technology equipment
GBZ 1 industrial enterprise design hygiene standard
DL 5009.1 Safety Practice for Power Construction (Part of Thermal Power Plant)
DL 5053 Labor Safety and Industrial Hygiene Design Regulations for Thermal Power Plants
DL/T 5032 Technical specification for general plan transportation design of thermal power plants
DL/T 5121 Technical Specification for Design of Tobacco Pulverized Coal Pipeline for Thermal Power Plant
DL/T 5136 Technical specification for secondary wiring design of thermal power plants and substations
DL/T 5153 Thermal power plant power consumption design technical regulations
HJ/T 75 Technical Specifications for Continuous Monitoring of Flue Gas Emissions from Fixed Sources (Trial)
HJ/T 76 Fixed pollution source flue gas emission continuous monitoring system technical requirements and testing methods
HG/T 20649 General Specification for Transportation Design of Chemical Enterprises
SH 3007 Petrochemical Storage and Transportation System Tank Design Specification
Regulations on the Safety Management of Dangerous Chemicals (Order No. 344 of the People's Republic of China)
Measures for the Safety Review of Production and Storage Projects of Dangerous Chemicals (State Administration of Work Safety, National Coal Mine Safety Supervision Bureau)
No. 17)
“Measures for Completion and Acceptance of Construction Projects (Engineering)” (Project Construction [1990] No. 1215)
Measures for the Administration of Environmental Protection Acceptance for Completion of Construction Projects (Order No. 13 of the State Environmental Protection Administration)
3 Terms and definitions
The following terms and definitions established by GB/T 21509 apply to this standard.
3.1 Denitrification Island denitrification island
A complete system including construction and control systems for denitration services.
3.2 denitrification system denitrification system
A system for removing nitrogen oxides (NOx) from flue gases by physical or chemical means. In this standard, the selective catalytic reduction method is used for denitration.
System.
3.3 Selective catalytic reduction (SCR)
A method in which a reducing agent selectively reacts with NOx in a flue gas under the action of a catalyst to generate nitrogen gas and water.
3.4 Reductant reductant
A substance and raw material used in a denitration system for reducing reaction with NOx.
3.5 ammonia spray grid ammonia injection grid
A device that uniformly sprays a reducing agent into the flue gas.
3.6 static mixer static mixer
A device for uniformly mixing the reducing agent with the flue gas.
3.7 ammonia escape mass concentration ammonia slip
The ratio of the mass of ammonia in the flue gas at the outlet of the SCR reactor to the volume of the flue gas (101.325 kPa, 0 ° C, dry basis, excess air ratio 1.4),
Generally expressed in mg/m3.
3.8 system availability
The percentage of annual normal operating time of the denitration system to the total annual operating time of the boiler. Calculated according to formula (1).
100% AB
−= × availability rate (1)
Where. A--the total annual running time of the boiler, h;
B--Dehydration system total outage time per year, h.
3.9 Boiler maximum continuous rating
The working condition of the maximum continuous evaporation of the boiler, referred to as the BMCR working condition.
3.10 boiler economic operating conditions boiler continuous rating
The working condition of the boiler economic evaporation corresponds to the heat consumption guarantee condition of the steam turbine unit, referred to as the BECR working condition.
4 Contaminants and pollution loads
4.1 When the new boiler is installed with denitration system, the design conditions should be based on the smoke volume, NOx and soot concentration under the BMCR condition.
The flue gas parameters; the calibration conditions should adopt the flue gas parameters when the flue gas volume, NOx and soot concentration are maximum at the BECR condition.
4.2 When the denitration system is installed in the boiler, the design working condition and the checking condition should be determined according to the measured flue gas parameters at the inlet of the denitration system, and
Consider the changing trend of fuel.
4.3 Flue gas parameters should be tested in accordance with GB/T 16157.
5 General requirements
5.1 General provisions
5.1.1 The overall design of the denitrification island includes general layout, vertical layout, integrated pipeline layout, greening planning, etc.
The body design is coordinated and meets the following requirements.
a) The process is reasonable, the flue is short, and meets the requirements of fire prevention, explosion protection and anti-virus;
b) convenient transportation;
c) handle the relationship between denitration systems and power plant facilities, production and living, production and construction;
d) Convenient construction, which is conducive to maintenance and repair;
e) make full use of the utility facilities in the factory;
f) Saving land, small amount of engineering and low operating costs.
5.1.2 A continuous monitoring system for flue gas emissions in accordance with HJ/T 76 shall be installed and continuously monitored in accordance with the requirements of HJ/T 75.
5.2 Engineering composition
5.2.1 The project mainly includes a reducing agent system, a catalytic reaction system, a public system and an auxiliary system.
5.2.2 Reductant system includes equipment for storage, preparation and supply of reducing agent.
5.2.3 Catalytic reaction systems include flue, ammonia injection and mixing devices, dilution air units, reactors, catalysts, and the like.
5.2.4 Public systems include steam systems, wastewater discharge systems, compressed air systems, etc.
5.2.5 Auxiliary systems include electrical systems, thermal automation systems, heating and air conditioning systems, and continuous monitoring systems for flue gas emissions.
5.3 General layout
5.3.1 General requirements
5.3.1.1 The principles to be followed in the general layout include. stable operation of equipment, convenient management and maintenance, economical rationality, safety and hygiene, etc.
5.3.1.2 The factors that should be considered for the general layout include. the vertical layout of the denitrification island, and the structure of the pollutant treatment and disposal process unit.
Arrangement, arrangement of integrated pipelines, etc.
5.3.1.3 When overhead pipelines and direct buried pipelines are connected to the outer island channel, the position, elevation, pipe diameter or channel break shall be indicated at the design boundary.
Surface size, slope, name of the slope to the trench, where to lead. The overhead pipe with a passing car has a clearance height of 5.0 m, and the indoor pipe bracket
The clearance height at the bottom of the beam is not less than 2.2 m.
5.3.2 Reductant zone
5.3.2.1 The reducing agent zone may be arranged in the plant area or outside the plant area. New power plant reductant storage should be included in the general layout of the plant area
Overall planning, and should consider the conditions when the unit is re-expanded. The distance between the reducing agent area and other buildings (structures) shall comply with the regulations of GB 50160.
set.
5.3.2.2 When the layout of the power plant is changed or expanded, the reductant storage facility may be arranged outside the plant, but the site selection requirements shall comply with DL/T 5032.
And the relevant provisions in HG/T 20649.
5.3.2.3 When liquid ammonia is used as the reducing agent, the fence in the reducing agent area shall be separately set with obvious warning signs and the evacuation distance shall be considered.
5.3.2.4 The floor of the reducing agent area should be lower than the surrounding road elevation.
5.3.2.5 The annular ammonia fire-fighting road should be provided in the liquid ammonia storage tank area. When the site is difficult, the end road can be set up, but the rotary ground should be set and meet the requirements.
The provisions of GB 50229.
5.3.2.6 The equipment in the reducing agent area should be arranged outdoors. The liquid ammonia storage tank should be provided with a awning to prevent direct sunlight. The structure of the awning should be avoided.
Forming a dead angle of a collectible gas.
5.3.2.7 The water rinsing device shall be provided in the site of the reducing agent zone, and the intercepting ditch shall be arranged in the lower part to be discharged to the wastewater pit.
5.3.2.8 The electrical cabinet cab cable entry trench in the reductant zone shall be isolated to prevent leakage of ammonia into the electrical cabinet compartment.
5.3.2.9 When urea is used as the reducing agent, the adiabatic decomposition chamber or the hydrolysis reactor may be arranged in the reducing agent zone or in the vicinity of the reactor.
Area.
5.3.3 Reactor zone
5.3.3.1 The reactor should be placed between the economizer and the air preheater and close to the boiler body.
5.3.3.2 For new or expanded units, the reactor should be placed vertically above the air preheater.
6 Process design
6.1 General requirements
6.1.1 The denitration system should match the boiler load change.
6.1.2 The reactor bypass shall not be provided in the denitration system.
6.1.3 The designed denitration efficiency at the maximum loading of the catalyst shall not be less than 80%.
6.1.4 The ammonia escape mass concentration should be less than 2.5 mg/m3.
6.1.5 SO2/SO3 conversion rate should be no more than 1%.
6.1.6 The system availability rate shall be not less than 98%, and the service life and overhaul period shall be matched with the generator set.
6.1.7 The denitration system shall be capable of continuous safe operation between the minimum stable combustion load of the boiler and any operating conditions between the BMCR, when the boiler is at a minimum stable
When the flue gas temperature cannot reach the minimum operating temperature of the catalyst under the load-loading condition, the high-temperature flue gas from the upstream of the economizer should be directly introduced into the reaction.
To increase the temperature of the flue gas.
6.1.8 The smoke pressure drop of the denitration system should be less than 1 400 Pa, and the system air leakage rate should be less than 0.4%.
6.2 Denitration system process
The denitration system generally consists of a reductant system, a catalytic reaction system, a public system, an auxiliary system, etc. The flow is shown in Figure 1.
Entrance
NO2 amount
Export
NO2 amount
Figure 1 Flow chart of typical thermal power plant flue gas SCR denitration system
6.3 Reductant system
6.3.1 General requirements
The reducing agent mainly includes liquid ammonia, urea and ammonia water, and the selection should be in accordance with the project environmental impact assessment document and the safety impact assessment document.
determine. The design of the pressure vessel in the reducing agent zone shall comply with the provisions of GB 150.
6.3.2 Liquid ammonia reducing agent
6.3.2.1 Liquid ammonia should meet the requirements of GB 536.
6.3.2.2 Liquid ammonia transportation tools should use special sealed tank trucks.
6.3.2.3 Liquid ammonia discharge can be carried out through an ammonia compressor, and a pipe connected to the discharge system should be provided at the interface with the tank truck for unloading ammonia.
After the air in the duct is discharged.
6.3.2.4 The liquid ammonia tank truck shall be unloaded with a universal filling piping system.
6.3.2.5 Liquid ammonia storage and preparation equipment shall comply with GB 536, GB 18218, "Hazardous Chemicals Safety Management Regulations" and "Dangerous Chemistry"
Relevant provisions of the Measures for the Safety Review of Production and Storage Construction Projects.
6.3.2.6 In the above ground, semi-underground storage tanks or storage tanks, fire dykes of non-combustible and corrosion-resistant materials shall be provided in accordance with GB 50351.
6.3.2.7 The corresponding gas leakage detection and alarm device, lightning protection and anti-static device, corresponding fire-fighting facilities and storage tanks shall be installed in the reducing agent area.
Full accessories, first aid facilities and equipment for leak emergency treatment.
6.3.2.8 The liquid ammonia storage tank capacity should be continuously operated for 3 to 5 days (24 hours per day) in accordance with the design conditions of the whole plant denitration system.
Designed with gas usage.
6.3.2.9 Liquid ammonia storage tanks shall be placed on one side of the edge of the reductant zone and shall have a minimum annual wind direction at an open flame or sparking location.
On the upwind side, its loading and unloading station should be close to the road (or railway).
6.3.2.10 The output of the ammonia gas preparation and storage device (liquid ammonia evaporator) shall be designed according to 120% of the ammonia consumption under the design conditions.
6.3.2.11 The reducing agent area shall have measures to control the secondary pollution of ammonia.
6.3.2.12 Nitrogen input piping shall be provided on the ammonia storage equipment and transport piping.
6.3.2.13 The equipment in the reductant zone should be pneumatically operated.
6.3.3 Urea reducing agent
6.3.3.1 Urea should meet the requirements of GB 2440.
6.3.3.2 Urea ammonia system has two modes of hydrolysis and pyrolysis. The typical system flow of the two processes is shown in Appendix A.
6.3.3.3 Urea ammonia system should be able to continuously and stably supply the ammonia flow required for denitration operation and meet the load fluctuation to ammonia supply.
The response requirements for volume adjustment.
6.3.3.4 The capacity of the urea granule storage tank should be continuously operated for 3 to 5 days (24 hours per day) according to the design conditions of the whole plant denitration system.
The amount of ammonia used is designed.
6.3.3.5 The conveying pipeline from the urea granule storage tank to the urea dissolution tank shall be provided with a shut-off device and measures to avoid material blocking.
6.3.3.6 The urea dissolution tank should be arranged indoors, and the connecting pipes between the equipments should be insulated.
6.3.3.7 All materials such as equipment in contact with the urea solution should be made of stainless steel.
6.3.3.8 When the ammonia hydrolysis process is used to prepare ammonia gas, the output of the urea hydrolysis reactor should be based on the ammonia consumption of the denitration system design conditions.
120% of the design.
6.3.3.9 When a pyrolysis process is used to prepare ammonia gas, each reactor shall be provided with one adiabatic decomposition chamber, and the decomposition chamber inlet and outlet gas distribution pipes.
The damper should be provided with a damper, and the decomposition chamber and metering device should be placed close to the reactor.
6.3.3.10 All equipment shall be protected against frost and summer sun protection in winter.
6.3.4 Ammonia water reducing agent
6.3.4.1 When ammonia is used as the reducing agent, an ammonia solution with a mass fraction of 20% to 25% should be used.
6.3.4.2 Ammonia transport vehicles should use special sealed tank trucks.
6.3.4.3 Unloading pumps should be used for the discharge of ammonia water.
6.3.4.4 All equipment, piping and other components in contact with aqueous ammonia solutions shall be constructed of stainless steel.
6.3.4.5 The temperature of the mixed gas of ammonia and air should be higher than the condensation temperature of water.
6.3.5 Pipeline
6.3.5.1 Pipes for ammonia transportation shall comply with the relevant provisions of GB/T 20801, all pipes, fittings, valves and other components that may be in contact with ammonia.
Copper should be strictly prohibited. Safety valves shall be provided on the liquid ammonia pipeline and shall be designed in accordance with the relevant provisions of SH 3007.
6.3.5.2 All materials such as contact pumps and conveying pipes with urea solution should be made of stainless steel.
6.3.5.3 All pipelines should fully consider the measures of winter cold and antifreeze to prevent freezing of the infusion pipelines.
6.4 Reactor system
6.4.1 Reactors and flue
6.4.1.1 The reactor body is an all-steel welded structure, and the same sealing method as the boiler body should be adopted, and the outer wall should be insulated. Open air layout
When the insulation layer is used, rain protection facilities should be adopted.
6.4.1.2 The design pressure of the reactor and flue shall be in accordance with DL/T 5121, and the reactor and flue design temperature shall be in accordance with the BMC of the boiler.
The maximum operating temperature for the design or check of coal quality.
6.4.1.3 The average flue gas flow rate of the catalyst in the reactor shall be designed to meet the performance requirements of the catalyst, generally taking 4-6 m/s.
6.4.1.4 The reactor plane size shall be determined according to the flue gas flow rate and adjusted according to the catalyst module size and arrangement. reactor
The effective height should be based on the height of the module, the number of layers of the module, the net height between the layers, the soot blowing device, the flue gas rectifying grid, the height of the catalyst spare layer, etc.
Consider the decision comprehensively.
6.4.1.5 The inlet section of the reactor shall be provided with a baffle, and the outlet shall be provided with a constricted section whose angle of inclination shall be such as to avoid ash accumulation there.
6.4.1.6 Catalyst loading doors and manholes shall be provided at the corresponding catalyst sites on the side walls of the reactor.
6.4.1.7 The support of the catalyst in the reactor shall be used as a slide guide for catalyst installation and with the installation or replacement of the catalyst module.
Match with tools.
6.4.1.8 The reactor body may be in an integral suspension or support mode. If the support method is adopted, the reactor body should be fully considered.
The temperature difference stress of the structure and the horizontal thrust of the load-bearing steel frame caused by the thermal expansion of the bracket.
6.4.1.9 The reactor area shall be equipped with an overhauling device. The lifting height shall meet the lifting requirements of the catalyst floor to the uppermost catalyst inlet of the reactor.
The lifting weight is determined by the weight of the catalyst module.
6.4.1.10 Reactor The platform shall be provided as a walkway in the outer circumference of the reactor. The platform may be in the form of a grille or a pat......
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