CN210135575U - Ultralow nitrogen combustion system of coal-fired generating set - Google Patents
Ultralow nitrogen combustion system of coal-fired generating set Download PDFInfo
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- CN210135575U CN210135575U CN201920667603.5U CN201920667603U CN210135575U CN 210135575 U CN210135575 U CN 210135575U CN 201920667603 U CN201920667603 U CN 201920667603U CN 210135575 U CN210135575 U CN 210135575U
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 61
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 18
- 239000003245 coal Substances 0.000 claims abstract description 40
- 239000007787 solid Substances 0.000 claims abstract description 33
- 239000007789 gas Substances 0.000 claims abstract 2
- 238000000197 pyrolysis Methods 0.000 claims description 50
- 239000000843 powder Substances 0.000 claims description 38
- 238000000926 separation method Methods 0.000 claims description 24
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 22
- 239000003546 flue gas Substances 0.000 claims description 22
- 239000000446 fuel Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 13
- 239000000779 smoke Substances 0.000 claims description 6
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000010248 power generation Methods 0.000 abstract description 3
- 239000012071 phase Substances 0.000 description 10
- 238000006722 reduction reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000007792 gaseous phase Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model relates to a coal-fired generating set ultra-low nitrogen combustion system, including the boiler, its characteristics are, set up on boiler furnace and go up wind gap, boiler overfire wind gap, gas phase spout, gas-solid spout under the boiler overgrate air, boiler furnace follows supreme boiler furnace owner burning zone, boiler furnace reducing zone and the boiler furnace after-combustion zone of falling into down, sets up the controllable high temperature of buggy and pyrolyzes the device in advance outside the boiler. The coal-fired power generation device has the advantages of simple structure, low cost, safety, reliability and the like, can greatly reduce the NOx emission in the combustion process of the boiler, reduces the pollution of a coal-fired power generation unit to the environment, and realizes the clean and efficient utilization of coal.
Description
Technical Field
The utility model relates to a coal-fired generating set is a coal-fired generating set minimum nitrogen combustion system.
Background
Coal resources are still the main energy in the world at present, and coal-fired power generating sets still occupy the main position of power generation systems for a long time in the future due to the advantages of controllability, stability, safety and the like. The main problem with coal-fired power generating units is the emission of pollutants from the combustion process, the main pollutant of which is NOx. The discharge amount of NOx of the coal-fired power generating unit is greatly dependent on a combustion system of a boiler, so that the coal-fired power generating unit is urgently required to realize ultra-low nitrogen combustion.
At present, low NOx emission is difficult to realize in most low-nitrogen combustion systems of coal-fired power generating units, and meanwhile, higher requirements are put forward for boiler combustion coal types, combustion process control, combustion load and the like.
Disclosure of Invention
The utility model aims at providing a to the problem that current coal-fired generating set direct combustion product discharge exceeds standard, consider influence factors such as security, controllability, the economic nature of combustion process, provide a simple structure, with low costs, safe and reliable can reduce boiler combustion process NOx emission by a wide margin, reduces the pollution of coal-fired generator group to the environment, realizes the coal-fired generating set ultra-low nitrogen combustion system of the clean high-efficient utilization of coal.
Realize the utility model discloses the technical scheme that the purpose adopted is: the utility model provides a coal-fired generating set ultra-low nitrogen combustion system, includes the boiler, its characterized in that sets up boiler overgrate air inlet 8, boiler overgrate air lower wind mouth 9, boiler burn-out wind mouth 41, gaseous phase spout 43, gas-solid spout 44 on boiler furnace 7, and boiler furnace 7 is from supreme boiler furnace owner firing zone 11, boiler furnace reduction zone 12 and the boiler furnace burn-out zone 42 of following. A controllable high-temperature coal powder pre-pyrolysis device 23 is arranged outside the boiler. The structure of the controllable high-temperature pre-pyrolysis device 23 for pulverized coal comprises: the device comprises a fuel combustion body 2, an igniter 1, a water spray desuperheater 3, a pulverized coal feeding device 22, an air box 21, a fan 20, a pyrolysis air-powder gas-solid separation device 4 and an air preheater 14, wherein an outlet at the lower part of the fuel combustion body 2 is communicated with an inlet of the pyrolysis air-powder gas-solid separation device 4, and an outlet of the pyrolysis air-powder gas-solid separation device 4 is sequentially communicated with a gas-solid nozzle 44 of a boiler and a main combustion zone 11 of a boiler hearth through a concentrated phase conveying pipeline 5 of the pyrolysis air-powder gas-solid separation device; an outlet of the pyrolysis air-powder gas-solid separation device 4 is communicated with a gas-phase nozzle 43 of the boiler and a reduction zone 12 of a hearth of the boiler in sequence through a dilute-phase conveying pipeline 6 of the pyrolysis air-powder gas-solid separation device; an upper inlet of the fuel combustion body 2 is communicated with a powder outlet of a coal powder feeding device 22, an igniter 1 and a water spray desuperheater 3 are arranged at the inlet of the fuel combustion body 2, the lower end of a wind box 21 is connected with a fan 20, the wind box 21 is communicated with an air inlet 40 of the coal powder feeding device through a wind box outlet pipeline 19, and the wind box 21 is communicated with an outlet 15 of an air preheater 14 through a flue gas drainage pipeline 16; the flue gas outlet of the boiler furnace 7 is communicated with the inlet 13 of the air preheater 14.
And a wind shield 18 is arranged on a wind box outlet pipeline 19 positioned at the front end of the wind inlet 40 of the pulverized coal feeding device.
And a tail smoke guide plate 17 is arranged on the smoke guide pipeline 16.
The fuel combustion body 2 is evenly divided into a high area, a middle area and a low area according to the height, and a first thermocouple 24, a second thermocouple 25, a third thermocouple 26 and a fourth thermocouple 27 are evenly arranged around the high area; the fifth thermocouple 28, the sixth thermocouple 29, the seventh thermocouple 30 and the eighth thermocouple 31 are uniformly arranged on the periphery of the middle area; a ninth thermocouple 32, a tenth thermocouple 33, an eleventh thermocouple 34, and a twelfth thermocouple 35 are uniformly installed around the lower region.
The utility model discloses a coal-fired generating set ultralow nitrogen combustion system's advantage is embodied:
the system has simple structure and low cost, and can reach effective ultra-low NOx emission technical indexes without additionally arranging expensive scr denitration equipment;
2) the system has no special requirements on the boiler and the pulverized coal, is simple, safe and reliable, is easy to combine with the existing coal-fired generator set, and has high feasibility;
3) the system does not need to add extra working media (ammonia, water and the like), does not have additional operating cost, and is safe and economic;
4) the system does not have the problem of coking shutdown caused by additionally installing the traditional scr denitration equipment, effectively reduces the shutdown time and improves the economic benefit of the unit on the basis of realizing the ultra-low NOx emission technical index.
Drawings
FIG. 1 is a schematic structural diagram of an ultra-low nitrogen combustion system of a coal-fired power generating unit;
FIG. 2 is a diagram illustrating the arrangement of thermocouples of the controllable high-temperature pre-pyrolysis apparatus shown in FIG. 1;
FIG. 3 is a structural diagram of a temperature control system of the controllable high-temperature pre-pyrolysis device in FIG. 1.
In the figure: 1 igniter, 2 fuel combustion bodies, 3 water spray desuperheater, 4 pyrolysis air powder gas-solid separation devices, 5 pyrolysis air powder gas-solid separation device concentrated phase conveying pipelines, 6 pyrolysis air powder gas-solid separation device dilute phase conveying pipelines, 7 boiler furnace, 8 boiler secondary air inlets, 9 boiler secondary air outlets, 10 boiler furnace bottoms, 11 boiler furnace main combustion areas, 12 boiler furnace reduction areas, 13 air preheater inlets, 14 air preheaters, 15 air preheater outlets, 16 flue gas drainage pipelines, 17 tail drainage flue gas wind shields, 18 wind shields, 19 wind box outlet pipelines, 20 fans, 21 wind boxes, 22 coal powder feeding devices, 23 coal powder controllable pre-pyrolysis devices, 24 first thermocouples, 25 second thermocouples, 26 third thermocouples, 27 fourth thermocouples, 28 fifth thermocouples, 29 sixth thermocouples, 30 seventh thermocouples and 31 eighth thermocouples, a 32 ninth thermocouple, a 33 tenth thermocouple, a 34 eleventh thermocouple, a 35 twelfth thermocouple, a 36 first proportional integral controller, a 37 second proportional integral controller, a 38 third proportional differential controller, a 40 air inlet of a pulverized coal feeding device, a 41 boiler burnout air inlet, a 42 boiler furnace burnout area, a p1 temperature set value for triggering the opening of a water spray desuperheating valve of a pulverized coal controllable high-temperature pre-pyrolysis device, a p2 operating temperature set value of the pulverized coal controllable high-temperature pre-pyrolysis device, a p3 tail flue gas drainage flue gas flow of the controllable high-temperature pre-pyrolysis device, a p4 pulverized coal controllable high-temperature pre-pyrolysis device desuperheating water spray flow, a p5 pulverized coal controllable high-temperature pre-pyrolysis device internal fuel average temperature, and p6-p9 are respectively a high-area first thermocouple 24, a second thermocouple 25, a third thermocouple 26, a high-area first thermocouple 24, a high area second thermocouple 25 and a high area third thermocouple 26 which are, The output temperatures corresponding to the fourth thermocouple 27, p10-p13 are the output temperatures corresponding to the fifth thermocouple 28, the sixth thermocouple 29, the seventh thermocouple 30 and the eighth thermocouple 31 in the middle area of the fuel combustion body of the pulverized coal controllable high-temperature pre-pyrolysis device, which are uniformly divided according to the height, and p14-p17 are the output temperatures corresponding to the ninth thermocouple 32, the tenth thermocouple 33, the eleventh thermocouple 34 and the twelfth thermocouple 35 in the low area of the fuel combustion body of the pulverized coal controllable high-temperature pre-pyrolysis device, which are uniformly divided according to the height.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1 and 2, the utility model discloses a coal-fired generating set ultralow nitrogen combustion system, including the boiler, set up on boiler furnace 7 that the wind gap 8 is gone up to the boiler overgrate air, the wind gap 9 under the boiler overgrate air, boiler burn out wind gap 41, gaseous phase spout 43, gas-solid spout 44, boiler furnace 7 follows supreme boiler furnace owner firing zone 11, boiler furnace reducing zone 12 and the boiler furnace burn out zone 42 of following. A controllable high-temperature coal powder pre-pyrolysis device 23 is arranged outside the boiler. The structure of the controllable high-temperature pre-pyrolysis device 23 for pulverized coal comprises: the device comprises a fuel combustion body 2, an igniter 1, a water spray desuperheater 3, a pulverized coal feeding device 22, an air box 21, a fan 20, a pyrolysis air-powder gas-solid separation device 4 and an air preheater 14, wherein an outlet at the lower part of the fuel combustion body 2 is communicated with an inlet of the pyrolysis air-powder gas-solid separation device 4, and an outlet of the pyrolysis air-powder gas-solid separation device 4 is sequentially communicated with a gas-solid nozzle 44 of a boiler and a main combustion zone 11 of a boiler hearth through a concentrated phase conveying pipeline 5 of the pyrolysis air-powder gas-solid separation device; an outlet of the pyrolysis air-powder gas-solid separation device 4 is communicated with a gas-phase nozzle 43 of the boiler and a reduction zone 12 of a hearth of the boiler in sequence through a dilute-phase conveying pipeline 6 of the pyrolysis air-powder gas-solid separation device; an upper inlet of the fuel combustion body 2 is communicated with a powder outlet of a coal powder feeding device 22, an igniter 1 and a water spray desuperheater 3 are arranged at the inlet of the fuel combustion body 2, the lower end of a wind box 21 is connected with a fan 20, the wind box 21 is communicated with an air inlet 40 of the coal powder feeding device through a wind box outlet pipeline 19, and the wind box 21 is communicated with an outlet 15 of an air preheater 14 through a flue gas drainage pipeline 16; the flue gas outlet of the boiler furnace 7 is communicated with the inlet 13 of the air preheater 14. And a wind shield 18 is arranged on a wind box outlet pipeline 19 positioned at the front end of the wind inlet 40 of the pulverized coal feeding device. And a tail smoke guide plate 17 is arranged on the smoke guide pipeline 16. The fuel combustion body 2 is evenly divided into a high area, a middle area and a low area according to the height, and a first thermocouple 24, a second thermocouple 25, a third thermocouple 26 and a fourth thermocouple 27 are evenly arranged around the high area; the fifth thermocouple 28, the sixth thermocouple 29, the seventh thermocouple 30 and the eighth thermocouple 31 are uniformly arranged on the periphery of the middle area; a ninth thermocouple 32, a tenth thermocouple 33, an eleventh thermocouple 34, and a twelfth thermocouple 35 are uniformly installed around the lower region.
Referring to fig. 3, an output temperature p6 of the first thermocouple 24, an output temperature p7 of the second thermocouple 25, an output temperature p8 of the third thermocouple 26, an output temperature p9 of the fourth thermocouple 27, an output temperature p10 of the fifth thermocouple 28, an output temperature p11 of the sixth thermocouple 29, an output temperature p12 of the seventh thermocouple 30, an output temperature p13 of the eighth thermocouple 31, an output temperature p14 of the ninth thermocouple 32, an output temperature p15 of the tenth thermocouple 33, an output temperature p16 of the eleventh thermocouple 34, and an output temperature p17 of the twelfth thermocouple 35 are connected to the third proportional-derivative controller 38, respectively, an output temperature p5 of the third proportional-derivative controller 38 and a controllable high-temperature pre-pyrolysis device temperature set value p1 are connected to the first proportional-integral controller 36, the first proportional-integral controller 36 is connected to the tail windshield flue gas diversion duct 17, an output temperature p5 of the third proportional-derivative controller 38, and a water spray temperature-reduced set value p2 are connected to the second proportional-integral controller 36 The controller 37 is connected, the second proportional-integral controller 37 is connected with the water spray desuperheater 3, and the flue gas flow rate p3 and the desuperheating water flow rate p4 are connected with the controllable high-temperature pre-pyrolysis device 23.
The specific working process of the ultralow-nitrogen combustion system of the coal-fired power generating unit comprises the following steps:
referring to fig. 1-3, a pulverized coal controllable high-temperature pre-pyrolysis device 23 is installed outside a boiler furnace 7, pulverized coal and primary air generated by a fan 20 enter the pulverized coal controllable high-temperature pre-pyrolysis device 23, a pyrolysis air-powder gas-solid separation device 4 is arranged between the pulverized coal controllable high-temperature pre-pyrolysis device 23 and the boiler furnace 7, a part of gas-phase substances are introduced into a reduction reaction zone 12 of the boiler furnace through a pyrolysis air-powder gas-solid separation device conveying pipeline 6, other gas-solid two-phase flows are all sprayed into a main combustion zone 11 of the boiler furnace through a pyrolysis air-powder gas-solid separation device dense-phase conveying pipeline 5, secondary air is reasonably configured through a boiler secondary air upper air inlet 8 and a boiler secondary air lower air inlet 9 to perform a main combustion process, and overfire air is reasonably configured through a boiler overfire air inlet 41 to enable unburned CO to. High-temperature flue gas passes through the air preheater 14, and partial flue gas at the outlet 15 of the air preheater is guided to the air box 21 through the flue gas guide pipeline 16, and a tail guide flue gas wind shield 17 is arranged between the high-temperature flue gas and the air box to adjust the flow of the flue gas. The guided flue gas and the primary air are blown into the powder feeding device 22 through the wind shield 18 through the wind box outlet pipeline 19. Divide into high region, middle region and low region with controllable high temperature of buggy pyrolysis device in advance according to highly evenly, 4 thermocouples of even installation all around high region, promptly: a first thermocouple 24, a second thermocouple 25, a third thermocouple 26, and a fourth thermocouple 27; the middle zone was equipped with 4 thermocouples, namely: a fifth thermocouple 28, a sixth thermocouple 29, a seventh thermocouple 30, and an eighth thermocouple 31; the low region is installed with 4 thermocouples, i.e., a ninth thermocouple 32, a tenth thermocouple 33, an eleventh thermocouple 34, and a twelfth thermocouple 35. p6-p9 are output temperatures corresponding to four thermocouples in a high area respectively, p10-p13 are output temperatures corresponding to four thermocouples in a middle area respectively, p14-p17 are output temperatures corresponding to four thermocouples in a low area respectively, the average temperature p5 of the controllable high-temperature pre-pyrolysis device is calculated, the difference value obtained by comparing the average temperature with the temperature set value p1 of the controllable high-temperature pre-pyrolysis device is used as the input of the first proportional integral controller 36, and the tail flue gas drainage flue gas flow p3 of the pulverized coal controllable high-temperature pre-pyrolysis device is adjusted by adjusting the opening degree of the tail drainage flue gas wind shield 17. The average temperature p5 measured by thermocouples in different areas of the pulverized coal controllable high-temperature pre-pyrolysis device is different from the temperature set value p2 for triggering the opening of the water spray desuperheater by the pulverized coal controllable high-temperature pre-pyrolysis device, and the water flow p4 is adjusted after passing through the water spray desuperheater 3 after passing through the second proportional-integral controller 37. P3 and P4 are input into the controllable high-temperature pre-pyrolysis device 23.
The utility model discloses a used machinery of coal-fired generating set ultra-low nitrogen combustion system, electronic equipment and components and parts are the product on the market, easy implementation.
The utility model discloses a coal-fired generating set ultra-low nitrogen combustion system designs buggy combustion process into ignition burning- -pyrolysis- -gas-solid separation- -main burning- -reduction burning- -burn-off combustion process. The three stages of main combustion, reduction combustion and burnout combustion are completed in a hearth. The secondary reduction of NOx generated by pulverized coal combustion is realized, and the NOx emission is greatly reduced by a controllable high-temperature preheating and decomposing device before entering a hearth. The technical bottleneck that the NOx of the existing coal-fired boiler cannot be greatly reduced is broken through. Effectively reduces the emission of coal combustion pollutants to a certain extent and improves the clean utilization efficiency of coal.
Claims (4)
1. The utility model provides a coal-fired generating set ultralow nitrogen combustion system, it includes the boiler, its characterized in that: set up wind gap (8) on boiler furnace (7) on the boiler overgrate air, wind gap (9), boiler after-combustion wind gap (41), gas phase spout (43), gas-solid spout (44) under the boiler overgrate air, from supreme boiler furnace main burning zone (11), boiler furnace reducing zone (12) and the boiler furnace after-combustion zone (42) of following the share in boiler furnace (7), set up controllable high temperature of buggy and pyrolyze device (23) in advance outside the boiler, the structure of controllable high temperature of buggy is pyrolyzed device (23) in advance includes: the device comprises a fuel combustion body (2), an igniter (1), a water spray desuperheater (3), a pulverized coal feeding device (22), an air box (21), a fan (20), a pyrolysis air-powder gas-solid separation device (4) and an air preheater (14), wherein an outlet at the lower part of the fuel combustion body (2) is communicated with an inlet of the pyrolysis air-powder gas-solid separation device (4), and an outlet of the pyrolysis air-powder gas-solid separation device (4) is sequentially communicated with a gas-solid nozzle (44) of a boiler and a main combustion zone (11) of a boiler hearth through a concentrated phase conveying pipeline (5) of the pyrolysis air-powder gas-solid separation device; an outlet of the pyrolysis air-powder gas-solid separation device (4) is communicated with a gas-phase nozzle (43) of the boiler and a hearth reduction zone (12) of the boiler in sequence through a dilute-phase conveying pipeline (6) of the pyrolysis air-powder gas-solid separation device; an inlet at the upper part of the fuel combustion body (2) is communicated with a powder outlet of a coal powder feeding device (22), an igniter (1) and a water spray desuperheater (3) are arranged at the inlet of the fuel combustion body (2), the lower end of an air box (21) is connected with a fan (20), the air box (21) is communicated with an air inlet (40) of the coal powder feeding device through an air box outlet pipeline (19), and the air box (21) is communicated with an outlet (15) of an air preheater (14) through a flue gas drainage pipeline (16); and a flue gas outlet of the boiler hearth (7) is communicated with an inlet (13) of an air preheater (14).
2. The ultra-low nitrogen combustion system of a coal-fired power generating unit according to claim 1, characterized in that: and a wind shield (18) is arranged on a wind box outlet pipeline (19) positioned at the front end of the wind inlet (40) of the pulverized coal feeding device.
3. The ultra-low nitrogen combustion system of a coal-fired power generating unit according to claim 1, characterized in that: and a tail smoke drainage wind shield (17) is arranged on the smoke drainage pipeline (16).
4. The ultra-low nitrogen combustion system of a coal-fired power generating unit according to claim 1, characterized in that: the fuel combustion body (2) is evenly divided into a high area, a middle area and a low area according to the height, and a first thermocouple (24), a second thermocouple (25), a third thermocouple (26) and a fourth thermocouple (27) are evenly arranged on the periphery of the high area; a fifth thermocouple (28), a sixth thermocouple (29), a seventh thermocouple (30) and an eighth thermocouple (31) are uniformly arranged on the periphery of the middle area; and a ninth thermocouple (32), a tenth thermocouple (33), an eleventh thermocouple (34) and a twelfth thermocouple (35) are uniformly arranged on the periphery of the low area.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112032709A (en) * | 2020-08-30 | 2020-12-04 | 国电内蒙古东胜热电有限公司 | Ultra-low NOx emission system and method using pre-pyrolysis in combination with ammonia injection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112032709A (en) * | 2020-08-30 | 2020-12-04 | 国电内蒙古东胜热电有限公司 | Ultra-low NOx emission system and method using pre-pyrolysis in combination with ammonia injection |
| CN112032709B (en) * | 2020-08-30 | 2022-08-26 | 国电内蒙古东胜热电有限公司 | Ultra-low NOx emission system and method adopting combination of pre-pyrolysis and ammonia injection |
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