CN104437081A - Debugging method of ammonia region system in SCR flue gas denitration system - Google Patents
Debugging method of ammonia region system in SCR flue gas denitration system Download PDFInfo
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- CN104437081A CN104437081A CN201410589309.9A CN201410589309A CN104437081A CN 104437081 A CN104437081 A CN 104437081A CN 201410589309 A CN201410589309 A CN 201410589309A CN 104437081 A CN104437081 A CN 104437081A
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Abstract
The invention discloses a debugging method of an ammonia region system in an SCR flue gas denitration system and belongs to the technical field of environment protection. The debugging method of the ammonia region system in the SCR flue gas denitration system comprises the following steps: debugging a liquid ammonia storing and discharging system and a liquid ammonia vaporization system. According to the debugging method of the ammonia region system in the SCR flue gas denitration system, disclosed by the invention, various performances of the liquid ammonia storing and discharging system and the liquid ammonia vaporization system before running can be debugged, so that the liquid ammonia storing and discharging system and the liquid ammonia vaporization system satisfy the using requirements, a flue gas SCR denitration system of a thermal power plant can safely, stably and efficiently run, measures of NOx emission are lowered so as to reach the national emission standard, the pollution charge of NOx is also reduced, and flue gas is prevented from consuming energy due to reheating, so that needed energy is saved, the production cost is lowered, and the debugging method is suitable for popularization and application.
Description
Technical field
The present invention relates to environmental technology field, particularly the SCR flue gas denitrification system of thermal power plant.
Background technology
Nitrogen oxide comprises N
2o, NO, NO
2, N
2o
3, N
2o
4, N
2o
5deng, but to mainly NO, NO that air pollutes
2and N
2o.The nitrogen oxide produced in combustion mainly NO and NO
2---be collectively referred to as NOx, also have a certain amount of N
2o.In most combustion system, the NO of generation accounts for more than 90%.Because NO can be oxidized to NO very soon in atmospheric environment
2, therefore usually use NO
2mass concentration represent NOx concentration.Nitrogen oxide can cause following several harm to environment: cause acid rain or acid deposition; Cause photochemical fog; N
2o is greenhouse gases, greenhouse effects and damaging the ozone layer.
In the large power plant of the fire that China is a large amount of, a large amount of nitrogen oxide is comprised in its flue gas of discharging, serious pollution is caused to environment, the nitrogen oxide how eliminated in coal steam-electric plant smoke just seems particularly important, therefore in the flue gas of thermal power plant, adopt SCR denitration system to carry out denitration, wherein SCR is the abbreviation of Selective Catalytic Reduction, and Chinese is SCR, its principle is under catalyst action, reducing agent NH
3at relatively low temperature by NO and NO
2be reduced into N
2, and there is NH hardly
3oxidation reaction, thus improve N
2selective, decrease NH
3consumption.
Summary of the invention
Goal of the invention of the present invention is: for above-mentioned Problems existing, the adjustment method of ammonia sound zone system in a kind of SCR flue gas denitrification system is provided, can store and discharge system and liquid ammonia evaporation system liquefied ammonia, properties before operation is debugged accordingly, thus make it meet instructions for use, to make coal steam-electric plant smoke SCR denitration system safety, stable, efficient operation, the measure of low NOx drainage is fallen, to reach the discharge standard of country, reduce the charges for disposing pollutants of NOx simultaneously, flue gas is avoided to heat consumed energy again, save institute's energy requirement, reduce production cost, be applicable to applying.
The technical solution used in the present invention is as follows:
The adjustment method of ammonia sound zone system in SCR flue gas denitrification system of the present invention, comprises liquefied ammonia and stores and the debugging of discharge system and the debugging of liquid ammonia evaporation system; Wherein the debug process of liquefied ammonia storage and discharge system is as follows:
The test run of 1.1 discharging compressors: the inlet ductwork of discharging compressor and export pipeline to sky, after checking that discharging compressor possesses entry condition, starts on the spot; Discharging compressor carries out test run in 8 hours, and During Trail Operation records the vibration of discharging compressor, the parameter value of temperature in detail, after the test run of discharging compressor terminates, carries out uniting and adjustment to the distant signal of discharging compressor;
1.2 water pressure tests: the water pressure test is carried out to pipeline and valve, wherein test pressure is 1.5 times of design pressure; The water pressure test, when to ammonia tank water-filling, carries out actual verification to the liquid level of ammonia tank, and guarantee that liquid level instruction is correct, instruction of reporting to the police is correct;
The purging of 1.3 system pipelines: after pressure testing terminates, drain water more than pressure testing, add in liquid ammonia storage tank with instrument source of the gas, pressure adds to 0.6MPa, should ftercompction continuously during purging, and purging must purge continuously with atm number, repeatedly blows down, until blow down mouth without stain;
The leak test of 1.4 systems: air-tight test is first pressurizeed with instrument source of the gas, rear compressor pressurizes 2.16MPa; Air-tight test pressurization point 0.1MPa, 0.5MPa, 1.0MPa and 2.16MPa four-stage carries out; Adopt each seal point of suds brushing and solder joint, bubble-free is emerged; After being forced into 2.16MPa, pressurize 24 hours, if the pressure drop of first 2 hours need be less than 0.03MPa, it is qualified that the pressure drop of latter 22 hours need be less than 0.02MPa, otherwise is defective; Air-tight test terminates, and drains intrasystem pressure;
The test run of 1.5 pairs of waste water pumps, it is identical with the test run method of conventional pump;
Displacement before 1.6 dischargings: to unloading ammonia pipeline and storage tank adopts vacuumizing method to replace, will guarantee that gaseous anhydrous ammonia and air melting concn be not at 16% ~ 25%(V/V before unloading ammonia);
1.7 unload ammonia operation: improve groove interior pressure with discharging compressor, make groove interior pressure higher than storage tank pressure, utilize pressure reduction by the liquefied ammonia press-in storage tank in tank car;
Liquefied ammonia displacement between 1.8 storage tanks: utilize discharging compressor, can liquefied ammonia be switched to another one storage tank from a storage tank;
The test of 1.9 spray systems: simulation liquefied ammonia storage tank pressure is high or temperature is high or any one ammonia leak detection apparatus arrives high alarm setting, and the shower water of liquefied ammonia storage system should be able to be opened automatically.
Wherein the debug process of liquid ammonia evaporation system is as follows:
The debugging of 2.1 dilution airs: start dilution air on the spot and carry out test run in 8 hours, During Trail Operation records the vibration of dilution air, the parameter value of temperature in detail, after dilution air test run terminates, carries out uniting and adjustment to the distant signal of dilution air;
The purging of 2.2 system pipelines and the cleaning of storage tank: purge ammonia pipeline with instrument source of the gas, repeatedly blow down, until blow down mouth without stain; Toward liquefied ammonia evaporator tank water-filling, carry out actual verification to the liquid level gauge of liquefied ammonia evaporator tank, guarantee that liquid level is correct, instruction of reporting to the police is correct;
The leak test of 2.3 systems: by compressor pressurizes to 2.16MPa, with each seal point of suds brushing and solder joint, till bubble-free is emerged;
The operation of 2.4 liquid ammonia evaporation system: liquefied ammonia relies on the pressure of self to be transported to liquefied ammonia evaporator tank from storage tank, and liquefied ammonia is heated by steam into gas ammonia and enters in ammonia dashpot in evaporator tank; Nitrogen displaced air is utilized before liquefied ammonia evaporation and spraying system pipeline enter ammonia; Before ammonia system again passes into ammonia after passing into ammonia or maintenance first, need to pass into the air in nitrogen displacement liquefied ammonia evaporator tank, ammonia dashpot and pipeline; Comprise liquefied ammonia storage tank to the inflated with nitrogen of liquefied ammonia evaporator tank pipeline to replace, the inflated with nitrogen displacement of ammonia dashpot inlet duct, the inflated with nitrogen displacement of ammonia dashpot outlet conduit, ammonia/air Mixture entrance inflated with nitrogen displacement;
The test of 2.5 spray systems: any one ammonia leak detection apparatus of simulation liquefied ammonia evaporation region arrives high alarm setting, and the shower water of liquefied ammonia storage system should be able to be opened automatically.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
The adjustment method of ammonia sound zone system in SCR flue gas denitrification system of the present invention, can store and discharge system and liquid ammonia evaporation system liquefied ammonia, properties before operation is debugged accordingly, thus make it meet instructions for use, to make coal steam-electric plant smoke SCR denitration system safety, stablize, to run efficiently, the measure of low NOx drainage is fallen, to reach the discharge standard of country, reduce the charges for disposing pollutants of NOx simultaneously, flue gas is avoided to heat consumed energy again, save institute's energy requirement, reduced production cost, be applicable to applying.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the structural representation of the SCR flue gas denitrification system of thermal power plant of the present invention.
Mark in figure: 1-boiler, 2-economizer, 3-denitrator, 4-air preheater, 5-electric dust collector, 6-desulfurizer, 7-chimney, 8-pressure fan, 9-liquefied ammonia storage tank, 10-, liquefied ammonia evaporator tank, 11-dilution air, 12-liquefied ammonia surge tank, 13-blender, 14-boiler load signal, 15-nitrogen oxide monitor.
Detailed description of the invention
All features disclosed in this description, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Arbitrary feature disclosed in this description (comprising any accessory claim, summary), unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
As shown in Figure 1, the SCR flue gas denitrification system of thermal power plant of the present invention, comprise boiler 1 and economizer 1, the outlet of described boiler 1 is connected with economizer 1, the outlet of described economizer 1 connects denitrator 3, described denitrator 3 connects air preheater 4, and the outlet of described air preheater 4 connects desulfurizer 6 by deduster 5, and the outlet of described desulfurizer 6 connects chimney 6; The air cooling entrance of described air preheater 4 is connected with pressure fan 8, and the air cooling outlet of described air preheater 4 is connected to boiler 1; Pipeline between described economizer 1 and denitrator 3 is connected with liquefied ammonia to store and discharge system and monitoring system.Wherein said liquefied ammonia stores and discharge system comprises liquefied ammonia storage tank 9, liquefied ammonia evaporator tank 10, liquefied ammonia surge tank 12 and blender 13, described liquefied ammonia storage tank 9 is connected on liquefied ammonia evaporator tank 10, described liquefied ammonia evaporator tank 10 is connected to liquefied ammonia surge tank 12, described liquefied ammonia surge tank 12 and dilution air 11 are connected on blender 13, and described blender 13 is connected on the pipeline between economizer 1 and denitrator 3; Described monitoring system is connected on the pipeline between liquefied ammonia surge tank 12 and blender 13.Wherein said monitoring system comprises nitrogen oxide monitor 15, described nitrogen oxide monitor 15 connects boiler load monitor, FIC equipment and economizer 1 exit simultaneously, wherein said boiler load monitor is located on boiler 1, and described FIC equipment is located on the pipeline between liquefied ammonia surge tank 12 and blender 13.
The adjustment method of ammonia sound zone system in SCR flue gas denitrification system of the present invention, comprises liquefied ammonia and stores and the debugging of discharge system and the debugging of liquid ammonia evaporation system; Wherein the debug process of liquefied ammonia storage and discharge system is as follows:
The test run of 1.1 discharging compressors: the inlet ductwork of discharging compressor and export pipeline to sky, after checking that discharging compressor possesses entry condition, starts on the spot; Discharging compressor carries out test run in 8 hours, and During Trail Operation records the vibration of discharging compressor, the parameter value of temperature in detail, after the test run of discharging compressor terminates, carries out uniting and adjustment to the distant signal of discharging compressor;
1.2 water pressure tests: the water pressure test is carried out to pipeline and valve, wherein test pressure is 1.5 times of design pressure; The water pressure test, when to ammonia tank water-filling, carries out actual verification to the liquid level of ammonia tank, and guarantee that liquid level instruction is correct, instruction of reporting to the police is correct;
The purging of 1.3 system pipelines: after pressure testing terminates, drain water more than pressure testing, add in liquid ammonia storage tank with instrument source of the gas, pressure adds to 0.6MPa, should ftercompction continuously during purging, and purging must purge continuously with atm number, repeatedly blows down, until blow down mouth without stain;
The leak test of 1.4 systems: air-tight test is first pressurizeed with instrument source of the gas, rear compressor pressurizes 2.16MPa; Air-tight test pressurization point 0.1MPa, 0.5MPa, 1.0MPa and 2.16MPa four-stage carries out; Adopt each seal point of suds brushing and solder joint, bubble-free is emerged; After being forced into 2.16MPa, pressurize 24 hours, if the pressure drop of first 2 hours need be less than 0.03MPa, it is qualified that the pressure drop of latter 22 hours need be less than 0.02MPa, otherwise is defective; Air-tight test terminates, and drains intrasystem pressure;
The test run of 1.5 pairs of waste water pumps, it is identical with the test run method of conventional pump;
Displacement before 1.6 dischargings: to unloading ammonia pipeline and storage tank adopts vacuumizing method to replace, will guarantee that gaseous anhydrous ammonia and air melting concn be not at 16% ~ 25%(V/V before unloading ammonia);
1.7 unload ammonia operation: improve groove interior pressure with discharging compressor, make groove interior pressure higher than storage tank pressure, utilize pressure reduction by the liquefied ammonia press-in storage tank in tank car;
Liquefied ammonia displacement between 1.8 storage tanks: utilize discharging compressor, can liquefied ammonia be switched to another one storage tank from a storage tank;
The test of 1.9 spray systems: simulation liquefied ammonia storage tank pressure is high or temperature is high or any one ammonia leak detection apparatus arrives high alarm setting, and the shower water of liquefied ammonia storage system should be able to be opened automatically.
Wherein the debug process of liquid ammonia evaporation system is as follows:
The debugging of 2.1 dilution airs: start dilution air on the spot and carry out test run in 8 hours, During Trail Operation records the vibration of dilution air, the parameter value of temperature in detail, after dilution air test run terminates, carries out uniting and adjustment to the distant signal of dilution air;
The purging of 2.2 system pipelines and the cleaning of storage tank: purge ammonia pipeline with instrument source of the gas, repeatedly blow down, until blow down mouth without stain; Toward liquefied ammonia evaporator tank water-filling, carry out actual verification to the liquid level gauge of liquefied ammonia evaporator tank, guarantee that liquid level is correct, instruction of reporting to the police is correct;
The leak test of 2.3 systems: by compressor pressurizes to 2.16MPa, with each seal point of suds brushing and solder joint, till bubble-free is emerged;
The operation of 2.4 liquid ammonia evaporation system: liquefied ammonia relies on the pressure of self to be transported to liquefied ammonia evaporator tank from storage tank, and liquefied ammonia is heated by steam into gas ammonia and enters in ammonia dashpot in evaporator tank; Nitrogen displaced air is utilized before liquefied ammonia evaporation and spraying system pipeline enter ammonia; Before ammonia system again passes into ammonia after passing into ammonia or maintenance first, need to pass into the air in nitrogen displacement liquefied ammonia evaporator tank, ammonia dashpot and pipeline; Comprise liquefied ammonia storage tank to the inflated with nitrogen of liquefied ammonia evaporator tank pipeline to replace, the inflated with nitrogen displacement of ammonia dashpot inlet duct, the inflated with nitrogen displacement of ammonia dashpot outlet conduit, ammonia/air Mixture entrance inflated with nitrogen displacement;
The test of 2.5 spray systems: any one ammonia leak detection apparatus of simulation liquefied ammonia evaporation region arrives high alarm setting, and the shower water of liquefied ammonia storage system should be able to be opened automatically.
The adjustment method of ammonia sound zone system in SCR flue gas denitrification system of the present invention, can store and discharge system and liquid ammonia evaporation system liquefied ammonia, properties before operation is debugged accordingly, thus make it meet instructions for use, to make coal steam-electric plant smoke SCR denitration system safety, stablize, to run efficiently, the measure of low NOx drainage is fallen, to reach the discharge standard of country, reduce the charges for disposing pollutants of NOx simultaneously, flue gas is avoided to heat consumed energy again, save institute's energy requirement, reduced production cost, be applicable to applying.
The present invention is not limited to aforesaid detailed description of the invention.The present invention expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (2)
- The adjustment method of ammonia sound zone system in 1.SCR flue gas denitrification system, is characterized in that: it comprises liquefied ammonia and stores and the debugging of discharge system and the debugging of liquid ammonia evaporation system; Wherein the debug process of liquefied ammonia storage and discharge system is as follows:The test run of 1.1 discharging compressors: the inlet ductwork of discharging compressor and export pipeline to sky, after checking that discharging compressor possesses entry condition, starts on the spot; Discharging compressor carries out test run in 8 hours, and During Trail Operation records the vibration of discharging compressor, the parameter value of temperature in detail, after the test run of discharging compressor terminates, carries out uniting and adjustment to the distant signal of discharging compressor;1.2 water pressure tests: the water pressure test is carried out to pipeline and valve, wherein test pressure is 1.5 times of design pressure; The water pressure test, when to ammonia tank water-filling, carries out actual verification to the liquid level of ammonia tank, and guarantee that liquid level instruction is correct, instruction of reporting to the police is correct;The purging of 1.3 system pipelines: after pressure testing terminates, drain water more than pressure testing, add in liquid ammonia storage tank with instrument source of the gas, pressure adds to 0.6MPa, should ftercompction continuously during purging, and purging must purge continuously with atm number, repeatedly blows down, until blow down mouth without stain;The leak test of 1.4 systems: air-tight test is first pressurizeed with instrument source of the gas, rear compressor pressurizes 2.16MPa; Air-tight test pressurization point 0.1MPa, 0.5MPa, 1.0MPa and 2.16MPa four-stage carries out; Adopt each seal point of suds brushing and solder joint, bubble-free is emerged; After being forced into 2.16MPa, pressurize 24 hours, if the pressure drop of first 2 hours need be less than 0.03MPa, it is qualified that the pressure drop of latter 22 hours need be less than 0.02MPa, otherwise is defective; Air-tight test terminates, and drains intrasystem pressure;The test run of 1.5 pairs of waste water pumps, it is identical with the test run method of conventional pump;Displacement before 1.6 dischargings: to unloading ammonia pipeline and storage tank adopts vacuumizing method to replace, will guarantee that gaseous anhydrous ammonia and air melting concn be not at 16% ~ 25%(V/V before unloading ammonia);1.7 unload ammonia operation: improve groove interior pressure with discharging compressor, make groove interior pressure higher than storage tank pressure, utilize pressure reduction by the liquefied ammonia press-in storage tank in tank car;Liquefied ammonia displacement between 1.8 storage tanks: utilize discharging compressor, can liquefied ammonia be switched to another one storage tank from a storage tank;The test of 1.9 spray systems: simulation liquefied ammonia storage tank pressure is high or temperature is high or any one ammonia leak detection apparatus arrives high alarm setting, and the shower water of liquefied ammonia storage system should be able to be opened automatically.
- 2. the adjustment method of ammonia sound zone system in SCR flue gas denitrification system as claimed in claim 1, is characterized in that: wherein the debug process of liquid ammonia evaporation system is as follows:The debugging of 2.1 dilution airs: start dilution air on the spot and carry out test run in 8 hours, During Trail Operation records the vibration of dilution air, the parameter value of temperature in detail, after dilution air test run terminates, carries out uniting and adjustment to the distant signal of dilution air;The purging of 2.2 system pipelines and the cleaning of storage tank: purge ammonia pipeline with instrument source of the gas, repeatedly blow down, until blow down mouth without stain; Toward liquefied ammonia evaporator tank water-filling, carry out actual verification to the liquid level gauge of liquefied ammonia evaporator tank, guarantee that liquid level is correct, instruction of reporting to the police is correct;The leak test of 2.3 systems: by compressor pressurizes to 2.16MPa, with each seal point of suds brushing and solder joint, till bubble-free is emerged;The operation of 2.4 liquid ammonia evaporation system: liquefied ammonia relies on the pressure of self to be transported to liquefied ammonia evaporator tank from storage tank, and liquefied ammonia is heated by steam into gas ammonia and enters in ammonia dashpot in evaporator tank; Nitrogen displaced air is utilized before liquefied ammonia evaporation and spraying system pipeline enter ammonia; Before ammonia system again passes into ammonia after passing into ammonia or maintenance first, need to pass into the air in nitrogen displacement liquefied ammonia evaporator tank, ammonia dashpot and pipeline; Comprise liquefied ammonia storage tank to the inflated with nitrogen of liquefied ammonia evaporator tank pipeline to replace, the inflated with nitrogen displacement of ammonia dashpot inlet duct, the inflated with nitrogen displacement of ammonia dashpot outlet conduit, ammonia/air Mixture entrance inflated with nitrogen displacement;The test of 2.5 spray systems: any one ammonia leak detection apparatus of simulation liquefied ammonia evaporation region arrives high alarm setting, and the shower water of liquefied ammonia storage system should be able to be opened automatically.
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|---|---|---|---|
| CN201410589309.9A CN104437081A (en) | 2014-10-29 | 2014-10-29 | Debugging method of ammonia region system in SCR flue gas denitration system |
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Cited By (2)
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| CN109603543A (en) * | 2018-12-27 | 2019-04-12 | 华能国际电力股份有限公司丹东电厂 | It is a kind of for the interim for ammonia system and application method of power plant's SCR denitration device |
| CN114542965A (en) * | 2022-01-20 | 2022-05-27 | 广东红海湾发电有限公司 | Liquid ammonia storage tank overhauling and pressure testing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109603543A (en) * | 2018-12-27 | 2019-04-12 | 华能国际电力股份有限公司丹东电厂 | It is a kind of for the interim for ammonia system and application method of power plant's SCR denitration device |
| CN114542965A (en) * | 2022-01-20 | 2022-05-27 | 广东红海湾发电有限公司 | Liquid ammonia storage tank overhauling and pressure testing method |
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Application publication date: 20150325 |