CN112169589A - Ultralow-temperature flue gas SCR denitration system and technology - Google Patents
Ultralow-temperature flue gas SCR denitration system and technology Download PDFInfo
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- CN112169589A CN112169589A CN202011191552.7A CN202011191552A CN112169589A CN 112169589 A CN112169589 A CN 112169589A CN 202011191552 A CN202011191552 A CN 202011191552A CN 112169589 A CN112169589 A CN 112169589A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention relates to the technical field of waste gas purification processes and systems, in particular to an ultralow-temperature flue gas SCR denitration system and an ultralow-temperature flue gas SCR denitration process, which comprise a denitration system, an ammonia spraying system, a heat exchange system, a denitration purging system and a denitration thermal desorption system, wherein an inlet of the denitration system is communicated with an inlet flue gas pipeline, the ammonia spraying system is connected with an ammonia spraying grid in an inlet flue of the denitration system, a compressed air storage tank and a dilution fan are connected with the inlet pipeline of the heat exchange system, an outlet of the heat exchanger system is communicated with a urea pyrolysis device and the denitration purging device in the ammonia spraying system, the inlet flue is communicated with the inlet pipeline of the denitration thermal desorption system, and compressed air has temperature in the purging process and reacts with a catalyst while being cleaned, so; the temperature of the air at the inlet of the urea pyrolysis device is higher, the energy consumption of the hot blast stove is reduced, and the ultra-long continuous working time of ultra-low temperature catalysis is ensured.
Description
Technical Field
The invention relates to the technical field of waste gas purification processes and systems, in particular to an ultralow-temperature flue gas SCR denitration system and process.
Background
The control of nitrogen oxide emissions in non-electric power industry (including self-contained power stations) is extremely difficult because the emission temperature of flue gas of industrial boiler (kiln) equipment (such as industrial boilers, glass ceramic kilns, cement kilns, metallurgical sintering furnaces of steel and iron, coking and petrochemical system cracking equipment and the like) and process exhaust gas related to nitric acid production and use is in the range of 120-300 ℃, while the working temperature of the current medium-temperature SCR denitration catalyst used in the electric power industry is 300-400 ℃. Therefore, the medium-temperature (300-400 ℃) SCR catalytic process is difficult to be directly used for NO in the non-electric power industryxThe discharge is controlled. Selective non-catalytic reduction (SNCR) nitrogen oxides are inefficient in purification and difficult to meet stringent emission standards, and therefore, ultra-low temperature and low temperature SCR are the main engineering technologies to achieve the goal of "air pollution prevention action plan".
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and the ultralow-temperature flue gas SCR denitration system and the ultralow-temperature flue gas SCR denitration process have the advantages of good purging effect, capability of avoiding catalyst dust deposition and blockage, easiness in desorption and regeneration of the catalyst, safety in the source of ammonia gas serving as a reducing agent and the like.
The invention is realized by adopting the following technical scheme:
the ultralow-temperature flue gas SCR denitration system comprises an SCR denitration system, an ammonia spraying system, a heat exchange system, an SCR denitration purging system and an SCR denitration thermal desorption system.
SCR deNOx systems includes the SCR reactor, it includes dilution fan to spout the ammonia system, the heat exchanger, electric heater, urea solution feeding device, urea pyrolysis furnace and spout the ammonia grid, the dust remover is connected with the SCR reactor through entry flue gas pipeline in proper order, the heat exchanger, booster fan and chimney, the air conduit is connected with urea pyrolysis furnace through dilution fan, heat exchanger and electric heater in proper order, urea solution feeding device is connected with urea pyrolysis furnace, urea pyrolysis furnace export is connected with spouting the ammonia grid, spout the ammonia grid and locate in the entry flue gas pipeline.
The atomized urea solution in the ammonia spraying system is heated by hot air at a certain temperature to generate reducing agent ammonia, and the mode is safer and more economic than ammonia water under the condition of no direct ammonia gas source, and the corrosivity of the urea solution is lower than that of the ammonia water; after the hot air is heated by the heat exchanger, the energy consumption of the electric heater is further reduced.
The SCR denitration thermal desorption system comprises a hot blast stove, an inlet flue gas pipeline is connected with the hot blast stove through a heating branch, and an outlet of the hot blast stove is connected with the SCR reactor. The heating branch is provided with a circulating fan, and the hot blast stove is respectively connected with a natural gas supply device and an air supply device.
The flue gas with the temperature is reheated in the hot blast stove, so that the energy consumption of the hot blast stove is reduced, and the consumption of natural gas is reduced; the hot flue gas heats and decomposes the ammonium bisulfate attached to the surface layer of the catalyst in the SCR denitration system, so that the catalyst is resolved and regenerated, the activity of the catalyst is recovered, and the denitration efficiency is prevented from being reduced.
The SCR denitration purging system comprises a compressed air storage tank, the compressed air storage tank is connected with a rake purging device through a heat exchanger, and the rake purging device is installed in the SCR reactor. The rake purge means is preferably a rake sootblower.
The compressed air with a certain temperature can be cleaned and simultaneously reacts with the catalyst in a proper amount, so that the catalyst is more beneficial, and the phenomena of dust deposition, blockage and the like of the catalyst are reduced
Furthermore, an ammonia gas concentration analyzer is arranged at the inlet flue gas pipeline, and a nitrogen oxide concentration analyzer is arranged at the outlet of the SCR reactor.
The ultra-low temperature flue gas SCR denitration process is carried out by adopting the ultra-low temperature flue gas SCR denitration system, and comprises the following steps:
1) the method comprises the following steps that flue gas is dedusted by a deduster and then enters an inlet flue gas pipeline, normal-temperature air is sent to a heat exchanger by a dilution fan, the flue gas is heated by the heat exchanger and then is electrically heated and then enters a urea pyrolysis furnace, and urea solution is atomized by a skid-mounted device from a urea solution supply device and then enters the urea pyrolysis furnace;
2) ammonia gas produced by the urea pyrolysis furnace enters an inlet flue gas pipeline through an ammonia injection grid, is mixed with flue gas and then enters the SCR reactor for denitration reaction;
3) and after the denitrated flue gas is subjected to heat exchange and cooling by the heat exchanger, the denitrated flue gas is pressurized by the booster fan and then is discharged by a chimney after reaching the standard.
The system comprises an SCR denitration system, an ammonia spraying system, a heat exchange system, an SCR denitration purging system and an SCR denitration thermal desorption system; wherein, deNOx systems entry and entry flue gas pipeline intercommunication spout the ammonia grid in the ammonia system inserts deNOx systems entry flue, compressed air gas holder, dilution fan and heat transfer system entry pipe connection, urea pyrolysis device, SCR denitration purging device intercommunication among heat transfer system export and the ammonia system of spouting, SCR deNOx systems entry flue and the thermal analytic system entry pipeline intercommunication of SCR denitration. The compressed air has a certain temperature in the blowing process, can be cleaned and simultaneously has a proper amount of reaction with the catalyst, is more beneficial to the catalyst, and reduces the phenomena of dust deposition, blockage and the like of the catalyst; the air at the inlet of the urea pyrolysis device has a certain temperature, so that the energy consumption of the heater is reduced; when the SCR denitration system is subjected to thermal desorption, the inlet of the thermal desorption device is the flue gas with temperature in the original flue, so that the reduction of energy consumption of the hot blast stove is facilitated; the measures ensure the ultra-long continuous working time of ultra-low temperature catalysis.
Compared with the prior art, the invention has the following beneficial effects:
(1) the tail part arrangement mode can be adopted, the effective reaction temperature range is about 150-190 ℃, and compared with a low-temperature denitration process, the process does not need to modify the original equipment and a waste heat recovery device; the denitration device can be installed and overhauled in a modularized mode, is independent of an original flue gas system, can be flexibly distributed according to actual conditions on site, and saves the occupied space of equipment;
(2) the method can greatly save the operating cost of the denitration device, reduces the load of the induced draft fan by about 30 percent and the ammonia-nitrogen ratio by 10 percent compared with the low-temperature denitration technology, has high efficiency of flue gas denitration and low cost, and is suitable for popularization;
(3) the process of the invention does not change the original flue gas emission process, does not modify or change each kiln, and reduces the investment by more than 20 percent compared with the high-temperature SCR process;
(4) by NH in the invention3The concentration analyzer transmits the fluctuation value of the ammonia concentration to the distributed control system, the distributed control system records and displays the fluctuation rule of the ammonia concentration, meanwhile, the concentration of corresponding ammonia is calculated out at the outlet through detecting the concentration of oxynitride, and the system adjusting time of the distributed control system is obtained by combining with the lead time, so that the ammonia concentration recorded by the distributed control system is matched with the concentration of nitrogen oxide at the outlet, the problem of detecting the ammonia concentration in real time is effectively solved, the data is accurate and reliable, and the detection is quick.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1. a dust remover; 2. an inlet flue gas duct; 3. an ammonia injection grid; 4. an ammonia gas concentration analyzer; 5. an SCR reactor; 6. a heating branch; 7. a circulating fan; 8. a rake purge unit; 9. a urea pyrolysis furnace; 10. a urea solution supply device; 11. a nitrogen oxide concentration analyzer; 12. a natural gas supply; 13. an air supply device; 14. a hot blast stove; 15. a heat exchanger; 16. an electric heater; 17. a dilution fan; 18. an air duct; 19. a compressed air storage tank; 20. a booster fan; 21. and (4) a chimney.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1, ultra-low temperature flue gas SCR deNOx systems, including the SCR deNOx systems, spout the ammonia system, heat transfer system, SCR denitration purge system and the thermal analytic system of SCR denitration, dust remover 1 is in proper order with SCR reactor 5 through entry flue gas pipeline 2, heat exchanger 15, booster fan 20 and chimney 21 are connected, air conduit 18 is in proper order through dilution fan 17, heat exchanger 15 and electric heater 16 are connected with urea pyrolysis oven 9, urea solution feeding mechanism 10 is connected with urea pyrolysis oven 9, urea pyrolysis oven 9 export is connected with ammonia injection grid 3, ammonia injection grid 3 is located in entry flue gas pipeline 2.
The inlet flue gas pipeline 2 is connected with a hot blast stove 14 through a heating branch 6, and the outlet of the hot blast stove 14 is connected with an SCR reactor 5.
The heating branch 6 is provided with a circulating fan 7, and the hot blast stove 14 is respectively connected with a natural gas supply device 12 and an air supply device 13.
The compressed air storage tank 19 is connected with the rake purge device 8 through the heat exchanger 15, and the rake purge device 8 is installed in the SCR reactor 5.
An ammonia gas concentration analyzer 4 is arranged at the inlet flue gas pipeline 2, and a nitrogen oxide concentration analyzer 11 is arranged at the outlet of the SCR reactor 5.
The ultra-low temperature flue gas SCR denitration process is carried out by adopting the ultra-low temperature flue gas SCR denitration system, and comprises the following steps:
1) the method comprises the following steps that flue gas is dedusted by a deduster 1 and enters an inlet flue gas pipeline 2, normal-temperature air is sent to a heat exchanger 15 by a dilution fan 17, the air is heated by the heat exchanger 15 and then enters an electric heater 16 and then enters a urea pyrolysis furnace 9 after being heated, and urea solution is atomized by a skid-mounted device from a urea solution supply device 10 and then enters the urea pyrolysis furnace 9;
2) ammonia gas produced by the urea pyrolysis furnace 9 enters the inlet flue gas pipeline 2 through the ammonia injection grid 3, is mixed with flue gas and then enters the heating furnace 14 to be reheated and then enters the SCR reactor 5, denitration reaction is carried out in the SCR reactor 5, and meanwhile, compressed air in the compressed air storage tank 19 is heated by the heat exchanger 15 and then is swept to the SCR reactor 5 through the rake type sweeping device 8;
3) the denitrated flue gas is subjected to heat exchange and cooling by the heat exchanger 15, is pressurized by the booster fan 20 and then is discharged by the chimney 21 after reaching the standard.
Of course, the foregoing is only a preferred embodiment of the invention and should not be taken as limiting the scope of the embodiments of the invention. The present invention is not limited to the above examples, and equivalent changes and modifications made by those skilled in the art within the spirit and scope of the present invention should be construed as being included in the scope of the present invention.
Claims (6)
1. The utility model provides an ultra-low temperature flue gas SCR deNOx systems which characterized in that: dust remover (1) is connected with SCR reactor (5) through entry flue gas pipeline (2) in proper order, heat exchanger (15), booster fan (20) and chimney (21), and air conduit (18) are connected with urea pyrolysis oven (9) through dilution fan (17) in proper order, heat exchanger (15) and electric heater (16), and urea solution feeding device (10) are connected with urea pyrolysis oven (9), and urea pyrolysis oven (9) export is connected with ammonia injection grid (3), and ammonia injection grid (3) are located in entry flue gas pipeline (2).
2. The ultra-low temperature flue gas SCR denitration system of claim 1, characterized in that: the inlet flue gas pipeline (2) is connected with a hot blast stove (14) through a heating branch (6), and the outlet of the hot blast stove (14) is connected with the SCR reactor (5).
3. The ultra-low temperature flue gas SCR denitration system of claim 2, characterized in that: a circulating fan (7) is arranged on the heating branch (6), and a hot blast stove (14) is respectively connected with a natural gas supply device (12) and an air supply device (13).
4. The ultra-low temperature flue gas SCR denitration system of claim 1, characterized in that: the compressed air storage tank (19) is connected with the rake type purging device (8) through the heat exchanger (15), and the rake type purging device (8) is arranged in the SCR reactor (5).
5. The ultra-low temperature flue gas SCR denitration system of claim 1, characterized in that: an ammonia gas concentration analyzer (4) is arranged at the inlet flue gas pipeline (2), and a nitrogen oxide concentration analyzer (11) is arranged at the outlet of the SCR reactor (5).
6. An ultra-low temperature flue gas SCR denitration technology is characterized in that: the ultra-low temperature flue gas SCR denitration system of any one of claims 1 to 5 is adopted, and comprises the following steps:
1) the method comprises the following steps that flue gas is dedusted by a deduster (1), enters an inlet flue gas pipeline (2), normal-temperature air is sent to a heat exchanger (15) by a dilution fan (17), is heated by the heat exchanger (15), enters an electric heater (16), is reheated and enters a urea pyrolysis furnace (9), and urea solution is atomized by a urea solution supply device (10) through a skid-mounted device and enters the urea pyrolysis furnace (9);
2) ammonia gas produced by the urea pyrolysis furnace (9) enters the inlet flue gas pipeline (2) through the ammonia spraying grid (3), is mixed with flue gas and then enters the SCR reactor (5) for denitration reaction;
3) the denitrated flue gas is subjected to heat exchange and cooling by the heat exchanger (15), is pressurized by the booster fan (20), and is discharged by the chimney (21) after reaching the standard.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113877418A (en) * | 2021-06-18 | 2022-01-04 | 海南大学 | Flue gas catalytic denitration, catalyst intelligence sweep and waste heat utilization integrated device |
| CN114739002A (en) * | 2022-03-16 | 2022-07-12 | 华能伊敏煤电有限责任公司 | Denitration ammonia-spraying air preheating device |
| CN115041019A (en) * | 2022-06-16 | 2022-09-13 | 大唐环境产业集团股份有限公司 | SCR denitration urea pyrolysis ammonia production system of gas-steam combined cycle unit |
| CN115608146A (en) * | 2022-09-09 | 2023-01-17 | 山东乐辰节能环保科技有限公司 | Ultrahigh-concentration nitrogen oxide treatment system and method |
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| CN115608146A (en) * | 2022-09-09 | 2023-01-17 | 山东乐辰节能环保科技有限公司 | Ultrahigh-concentration nitrogen oxide treatment system and method |
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