CN114870560A - Full-load denitration bypass flue system coupled with urea hydrolysis and working method thereof - Google Patents
Full-load denitration bypass flue system coupled with urea hydrolysis and working method thereof Download PDFInfo
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- CN114870560A CN114870560A CN202210600817.7A CN202210600817A CN114870560A CN 114870560 A CN114870560 A CN 114870560A CN 202210600817 A CN202210600817 A CN 202210600817A CN 114870560 A CN114870560 A CN 114870560A
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- B01D53/005—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 by heat treatment
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- 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
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- B01D53/8625—Nitrogen oxides
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- 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
- B01D53/8696—Controlling the catalytic process
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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
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- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
- F23J15/027—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using cyclone separators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
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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
- B01D2251/2062—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2217/00—Intercepting solids
- F23J2217/40—Intercepting solids by cyclones
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2219/00—Treatment devices
- F23J2219/10—Catalytic reduction devices
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Abstract
The invention discloses a full-load denitration bypass flue system coupled with urea hydrolysis and a working method thereof, wherein an outlet of a flue gas bypass flue is connected with an inlet of a high-efficiency cyclone dust collector through an electric shutoff valve and an electric adjusting valve; the outlet of the steam header is divided into two paths, wherein one path is connected with the urea hydrolyzer through the temperature and pressure reducing device, and the other path is connected with the urea hydrolyzer through the heat exchanger in the main flue of the boiler.
Description
Technical Field
The invention belongs to the technical field of full-load denitration, and relates to a full-load denitration bypass flue system coupled with urea hydrolysis and a working method thereof.
Background
Promote the major hazard source (liquid ammonia tank field) of power generation enterprise to administer, many power plants adopt urea hydrolysis SCR denitration technique to replace, and this safety level of enterprise has obtained the powerful promotion.
However, the traditional wide-load denitration high-temperature bypass has large air extraction amount, large cross section of a flue and limited temperature rise capability (about 20-30 ℃), and for a compact unit, the bypass flue is very difficult to arrange between a vertical shaft flue of a boiler and a denitration inlet flue, so that the limitation is large. Under the working conditions of unit starting and low load, the smoke temperature at the denitration inlet is even as low as about 240 ℃, and the operation requirement of the denitration catalyst on the smoke temperature being more than or equal to 300 ℃ cannot be met.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a full-load denitration bypass flue system coupled with urea hydrolysis and a working method thereof, and the system and the working method thereof can meet the operation requirement of a denitration catalyst on the smoke temperature of more than or equal to 300 ℃.
In order to achieve the aim, the full-load denitration bypass flue system coupled with urea hydrolysis comprises a flue gas bypass flue, a boiler body, an electric shutoff door, an electric adjusting door, a high-efficiency cyclone dust collector, a bypass fan, a bypass flue gas header, a steam header, a temperature and pressure reducing device, a urea hydrolyzer, a boiler main flue, a dilution fan and an ammonia-air mixer;
an inlet of a flue gas bypass flue is connected with a steering chamber in a boiler body, an outlet of the flue gas bypass flue is connected with an inlet of a high-efficiency cyclone dust collector through an electric shutoff valve and an electric adjusting valve, an outlet of the high-efficiency cyclone dust collector is connected with an inlet of a bypass fan, an outlet of the bypass fan is communicated with an inlet of a bypass flue gas header, and a multi-channel large-depth injection device, a flue gas mixer and an ammonia gas injection device are arranged in a denitration inlet flue;
the outlet of the steam header is divided into two paths, wherein one path is connected with the urea hydrolyzer through a temperature and pressure reducing device, and the other path is connected with the urea hydrolyzer through a heat exchanger in a main flue of the boiler; the outlet of the urea hydrolyzer and the outlet of the dilution fan are connected with the inlet of an ammonia-air mixer, and the outlet of the ammonia-air mixer is connected with an ammonia gas injection device;
the flue gas bypass flue is connected with a steering chamber in the boiler body through a first expansion joint.
A second expansion joint is arranged between the high-efficiency cyclone dust collector and the bypass fan, and a third expansion joint is arranged between the bypass fan and the bypass flue gas header.
The outlet of the high-efficiency cyclone dust collector is connected with the inlet of the bypass fan through the circular flue.
High-efficient cyclone arranges in the top or the side of denitration entry flue.
An ash conveying port at the bottom of the high-efficiency cyclone dust collector is connected with an ash hopper at the bottom of the denitration inlet flue through a first electric butterfly valve.
An ash conveying port at the bottom of the bypass flue gas header is connected with an ash hopper at the bottom of the denitration inlet flue through an ash conveying pipeline, and a second electric butterfly valve is arranged on the ash conveying pipeline.
And an adjusting baffle group is arranged at the inlet of the multi-channel large-depth injection device.
The system also comprises a central controller;
control valve sets are respectively arranged at the inlet and the outlet of the temperature and pressure reducer and the inlet and the outlet of the heat exchanger, and a steering chamber temperature measuring device, a main flue gas temperature measuring device and a mixed flue gas temperature measuring device are respectively arranged above the steering chamber, the horizontal section of the main flue and the ammonia gas injection device;
the central controller is connected with the control valve group, the first electric butterfly valve, the steering chamber temperature measuring device, the main flue gas temperature measuring device, the second electric butterfly valve, the bypass fan, the electric shutoff door, the electric adjusting door, the adjusting baffle group and the mixed flue gas temperature measuring device.
The working method of the full-load denitration bypass flue system coupled with urea hydrolysis comprises the following steps:
when the temperature at the downstream of the ammonia gas injection device does not meet the operation requirement of an SCR system at 300 ℃, an electric shutoff door and an electric adjusting door are opened, a bypass fan is started, high-temperature flue gas is extracted from a steering chamber, is dedusted by a high-efficiency cyclone deduster, is conveyed to a bypass flue gas header, is injected into a denitration inlet flue through a multi-channel large-depth injection device, and is uniformly mixed with main flue gas through a flue gas mixer;
when the temperature in the denitration inlet flue is more than or equal to 300 ℃, steam output by the steam header is subjected to temperature and pressure reduction by the temperature reduction and pressure reduction device and then injected into the urea hydrolyzer, when the temperature in the denitration inlet flue is less than 300 ℃, part or all of the steam output by the steam header is preheated by the heat exchanger and then injected into the urea hydrolyzer after the temperature and pressure reduction of high-parameter steam is realized, ammonia product gas output by the urea hydrolyzer is mixed with dilution air output by the dilution fan in the ammonia-air mixer, then the mixed gas is injected into the mixed flue gas by the ammonia gas injection device and then enters the denitration inlet flue, and full-load denitration is realized.
The invention has the following beneficial effects:
when the full-load denitration bypass flue system coupled with urea hydrolysis and the working method thereof are operated specifically, the method fully utilizes the redundant heat of the steam used for urea hydrolysis to preheat the flue gas of the main path, and then secondarily heats the flue gas of the main path through the high-temperature bypass flue gas, thereby avoiding energy waste caused by direct temperature reduction and pressure reduction of high-parameter steam, effectively reducing the cross section area and the air suction quantity of the bypass flue gas due to preheating, reducing the influence of the high-temperature bypass on the boiler efficiency, meeting the operation requirement of a denitration catalyst on the flue gas temperature being more than or equal to 300 ℃, being beneficial to the arrangement of the bypass flue between the main flue and a denitration inlet flue, and being provided with a high-efficiency cyclone dust collector, a bypass fan and a multi-channel large-depth injection device in the bypass, the abrasion and the dust deposition of the bypass flue can be reduced, the injection depth of the bypass flue gas is ensured, and the controllable uniformity of the flue gas temperature is realized.
Drawings
FIG. 1 is a system flow diagram of the present invention;
wherein, 1 is a first expansion joint, 2 is an electric shutoff door, 3 is an electric adjusting door, 4 is a high-efficiency cyclone dust collector, 5 is a second expansion joint, 6 is a bypass fan, 7 is a third expansion joint, 8 is a bypass flue gas header, 9 is an adjusting baffle group, 10 is a multi-channel large-depth injection device, 11 is a flue gas mixer, 12 is a steam header, 13 is a temperature and pressure reducer, 14 is a urea hydrolyzer, 15 is a control valve group, 16 is a heat exchanger, 17 is an ammonia-air mixer, 18 is a dilution fan, 19 is an ammonia gas injection device, 201 is a first electric butterfly valve, 202 is a second electric butterfly valve, 21 is an ash hopper, 22 is a mixed flue gas temperature measuring device, 23 is a main flue gas temperature measuring device, 24 is a steering chamber temperature measuring device, and 25 is a central controller.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the full-load denitration bypass flue system coupled with urea hydrolysis according to the present invention includes a first expansion joint 1, an electric shutoff valve 2, an electric adjustment door 3, a high efficiency cyclone 4, a second expansion joint 5, a bypass fan 6, a third expansion joint 7, a bypass flue gas header 8, an adjustment baffle group 9, a multi-channel large depth injection device 10, a flue gas mixer 11, a steam header 12, a temperature and pressure reduction device 13, a urea hydrolyzer 14, a control valve group 15, a heat exchanger 16, an ammonia-air mixer 17, a dilution fan 18, an ammonia gas injection device 19, a first electric butterfly valve 201, a second electric butterfly valve 202, an ash bucket 21, a mixed flue gas temperature measuring device 2, a main flue gas temperature measuring device 23, a steering chamber temperature measuring device 24, and a central controller 25;
the flue gas bypass flue is connected with a steering chamber in the boiler body through a first expansion joint 1, the outlet of the flue gas bypass flue is connected with the inlet of a high-efficiency cyclone dust collector 4 through an electric shutoff valve 2 and an electric adjusting valve 3, the outlet of the high-efficiency cyclone dust collector 4 is connected with the inlet of a bypass fan 6 through a circular flue, the outlet of the bypass fan 6 is communicated with the inlet of a bypass flue gas header 8 through a third expansion joint 7, and a multi-channel large-depth injection device 10, a flue gas mixer 11 and an ammonia gas injection device 19 are arranged in the denitration inlet flue, wherein the multi-channel large-depth injection device 10, the flue gas mixer 11 and the ammonia gas injection device 19 are sequentially arranged along the flue gas flowing direction, and the bypass flue gas header 8 is connected with the multi-channel large-depth injection device 10;
the outlet of the steam header 12 is divided into two paths, wherein one path is connected with a urea hydrolyzer 14 through a temperature and pressure reducing device 13, and the other path is communicated with the urea hydrolyzer 14 through a heat exchanger 16 in a main flue of the boiler; the outlet of the urea hydrolyzer 14 and the outlet of the dilution fan 18 are connected to the inlet of the ammonia air mixer 17, and the outlet of the ammonia air mixer 17 is connected to the ammonia gas injection device 19.
High-efficient cyclone 4 arranges in the top or the side of denitration entry flue, and the defeated ash mouth of high-efficient cyclone 4 bottom links to each other with the ash bucket 21 of denitration entry flue bottom through first electric butterfly valve 201.
A second expansion joint 5 is arranged between the high-efficiency cyclone dust collector 4 and the bypass fan 6, and a third expansion joint 7 is arranged between the bypass fan 6 and the bypass flue gas header 8.
An ash conveying port at the bottom of the bypass flue gas header 8 is connected with an ash hopper 21 at the bottom of the denitration inlet flue through an ash conveying pipeline, and a second electric butterfly valve 202 is arranged on the ash conveying pipeline.
An adjusting baffle group 9 is arranged at the inlet of the multi-channel large-depth injection device 10, and each baffle in the adjusting baffle group 9 controls the flue gas flow of one channel.
Control valve sets 15 are installed at the inlet and the outlet of the temperature and pressure reducer 13 and the inlet and the outlet of the heat exchanger 16, wherein the control valve sets 15 are composed of one or more valves, and path selection and flow control are achieved.
A steering chamber temperature measuring device 24, a main flue gas temperature measuring device 23 and a mixed flue gas temperature measuring device 22 are respectively arranged above the steering chamber, the horizontal section of the main flue and the ammonia gas injection device 19.
The central controller 25 is connected with the control valve group 15, the second electric butterfly valve 202, the steering chamber temperature measuring device 24, the main flue gas temperature measuring device 23, the first electric butterfly valve 201, the bypass fan 6, the electric shutoff door 2, the electric adjusting door 3, the adjusting baffle group 9 and the mixed flue gas temperature measuring device 22.
The working method of the full-load denitration bypass flue system coupled with urea hydrolysis comprises the following steps:
when the feedback temperature measured by the mixed flue gas temperature measuring device 22 does not meet the operation requirement of the SCR system at 300 ℃, an electric shutoff door 2 and an electric adjusting door 3 are opened, a bypass fan 6 is started, part of high-temperature flue gas is extracted from a steering chamber, is dedusted by a high-efficiency cyclone dust collector 4, is conveyed to a bypass flue gas header 8, is distributed by each channel in the multi-channel large-depth injection device 10, is injected into a denitration inlet flue, and is uniformly mixed with the main flue gas at a flue gas mixer 11.
High-parameter steam (the pressure is more than or equal to 1MPa and the temperature is about 350 ℃) used for urea hydrolysis is taken from a steam header 12, when the temperature of a denitration inlet flue is more than or equal to 300 ℃, the steam output by the steam header 12 is adjusted to the pressure of 0.4-0.6 MPa and the temperature is about 180 ℃ through a temperature reduction and pressure reduction device 13 and then injected into a urea hydrolyzer 14, when the temperature of the denitration inlet flue is less than 300 ℃, a central controller 25 synchronously controls the opening and closing and the opening of a control valve group 15, so that part or all of the steam preheats main flue gas through a heat exchanger 16, the high-parameter steam is injected into the urea hydrolyzer 14 after being subjected to temperature reduction and pressure reduction, ammonia product gas output by the urea hydrolyzer 14 is mixed with dilution air output by a dilution fan 18 in an ammonia air mixer 17, then the mixed flue gas is injected through an ammonia gas injection device 19 and then enters the denitration inlet flue, and full-load denitration is realized.
Finally, the invention couples urea hydrolysis, fully utilizes the redundant heat of steam used for urea hydrolysis and high-temperature flue gas to heat the flue gas in the main path, can effectively increase the temperature of the denitration inlet flue gas to the SCR working temperature, ensures the temperature uniformity of mixed flue gas, and has the advantages of automatic adjustment of the whole system, simple structure, convenient operation and strong practicability.
Claims (10)
1. A full-load denitration bypass flue system coupled with urea hydrolysis is characterized by comprising a flue gas bypass flue, a boiler body, an electric shutoff valve (2), an electric adjusting valve (3), a high-efficiency cyclone dust collector (4), a bypass fan (6), a bypass flue gas header (8), a steam header (12), a temperature and pressure reducing device (13), a urea hydrolyzer (14), a boiler main flue, a dilution fan (18) and an ammonia-air mixer (17);
an inlet of a flue gas bypass flue is connected with a steering chamber in a boiler body, an outlet of the flue gas bypass flue is connected with an inlet of a high-efficiency cyclone dust collector (4) through an electric shutoff valve (2) and an electric adjusting valve (3), an outlet of the high-efficiency cyclone dust collector (4) is connected with an inlet of a bypass fan (6), an outlet of the bypass fan (6) is communicated with an inlet of a bypass flue gas header (8), a multi-channel large-depth injection device (10), a flue gas mixer (11) and an ammonia injection device (19) are arranged in a denitration inlet flue, wherein the multi-channel large-depth injection device (10), the flue gas mixer (11) and the ammonia injection device (19) are sequentially arranged along the flue gas flowing direction, and the bypass flue gas header (8) is connected with the multi-channel large-depth injection device (10);
an outlet of the steam header (12) is divided into two paths, wherein one path is connected with the urea hydrolyzer (14) through a temperature and pressure reducing device (13), and the other path is connected with the urea hydrolyzer (14) through a heat exchanger (16) in a main flue of the boiler; the outlet of the urea hydrolyzer (14) and the outlet of the dilution fan (18) are connected with the inlet of an ammonia-air mixer (17), and the outlet of the ammonia-air mixer (17) is connected with an ammonia gas injection device (19).
2. The full-load denitration bypass flue system coupled with urea hydrolysis as claimed in claim 1, wherein the flue gas bypass flue is connected with the turning chamber in the boiler body through a first expansion joint (1).
3. The full-load denitration bypass flue system coupled with urea hydrolysis as claimed in claim 2, wherein a second expansion joint (5) is arranged between the high-efficiency cyclone (4) and the bypass fan (6), and a third expansion joint (7) is arranged between the bypass fan (6) and the bypass flue gas header (8).
4. The full-load denitration bypass flue system coupled with urea hydrolysis as recited in claim 1, wherein the outlet of the high-efficiency cyclone (4) is connected with the inlet of the bypass fan (6) through a circular flue.
5. The full-load denitration bypass flue system coupled with urea hydrolysis as recited in claim 1, wherein the high-efficiency cyclone (4) is arranged above or at the side of the denitration inlet flue.
6. The full-load denitration bypass flue system coupled with urea hydrolysis as recited in claim 1, wherein an ash conveying port at the bottom of the high-efficiency cyclone (4) is connected with an ash hopper (21) at the bottom of the denitration inlet flue through a first electric butterfly valve (201).
7. The full-load denitration bypass flue system coupled with urea hydrolysis as claimed in claim 6, wherein an ash conveying port at the bottom of the bypass flue gas header (8) is connected with an ash hopper (21) at the bottom of the denitration inlet flue through an ash conveying pipeline, and a second electric butterfly valve (202) is arranged on the ash conveying pipeline.
8. The full-load denitration bypass flue system coupled with urea hydrolysis as recited in claim 1, characterized in that an adjusting baffle group (9) is arranged at the inlet of the multi-channel large-depth injection device (10).
9. The full load denitration bypass flue system coupled with urea hydrolysis according to claim 7, further comprising a central controller (25);
control valve sets (15) are respectively arranged at the inlet and the outlet of the temperature and pressure reducer (13) and the inlet and the outlet of the heat exchanger (16), and a steering chamber temperature measuring device (24), a main flue gas temperature measuring device (23) and a mixed flue gas temperature measuring device (22) are respectively arranged above the steering chamber, the horizontal section of the main flue and the ammonia gas injection device (19);
the central controller (25) is connected with the control valve group (15), the first electric butterfly valve (201), the steering chamber temperature measuring device (24), the main flue gas temperature measuring device (23), the second electric butterfly valve (202), the bypass fan (6), the electric shutoff door (2), the electric adjusting door (3), the adjusting baffle group (9) and the mixed flue gas temperature measuring device (22).
10. A method of operating a full-load denitration bypass flue system coupled with urea hydrolysis as set forth in claim 1, comprising the steps of:
when the temperature of the downstream of the ammonia gas injection device (19) does not meet the operation requirement of an SCR system at 300 ℃, an electric shutoff door (2) and an electric adjusting door (3) are opened, a bypass fan (6) is started, high-temperature flue gas is extracted from a steering chamber, is dedusted by a high-efficiency cyclone deduster (4), is conveyed to a bypass flue gas header (8), is injected into a denitration inlet flue through a multi-channel large-depth injection device (10), and is uniformly mixed with main flue gas through a flue gas mixer (11);
when the temperature in the denitration inlet flue is more than or equal to 300 ℃, steam output by the steam header (12) is subjected to temperature and pressure reduction through the temperature and pressure reduction device (13) and then injected into the urea hydrolyzer (14), when the temperature in the denitration inlet flue is less than 300 ℃, part or all of the steam output by the steam header (12) preheats main flue gas through the heat exchanger (16), high-parameter steam is subjected to temperature and pressure reduction and then injected into the urea hydrolyzer (14), and ammonia product gas output by the urea hydrolyzer (14) is mixed with dilution air output by the dilution fan (18) in the ammonia-air mixer (17), then is injected into mixed flue gas through the ammonia injection device (19), and then enters the denitration inlet flue to realize full-load denitration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210600817.7A CN114870560B (en) | 2022-05-30 | 2022-05-30 | Full-load denitration bypass flue system coupled with urea hydrolysis and working method thereof |
Applications Claiming Priority (1)
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| CN119413260A (en) * | 2024-12-25 | 2025-02-11 | 中国计量科学研究院 | Fixed pollution source flow in-situ calibration device and calibration method |
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