CN115301077A - Gas power generation low-temperature flue gas denitration system and method - Google Patents
Gas power generation low-temperature flue gas denitration system and method Download PDFInfo
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 239000003546 flue gas Substances 0.000 title claims abstract description 98
- 239000007789 gas Substances 0.000 title claims abstract description 58
- 238000010248 power generation Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000000243 solution Substances 0.000 claims abstract description 185
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 106
- 239000011550 stock solution Substances 0.000 claims abstract description 39
- 238000000889 atomisation Methods 0.000 claims abstract description 30
- 238000002156 mixing Methods 0.000 claims abstract description 28
- 238000005507 spraying Methods 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000006555 catalytic reaction Methods 0.000 claims abstract description 18
- 238000002955 isolation Methods 0.000 claims description 31
- 238000002347 injection Methods 0.000 claims description 28
- 239000007924 injection Substances 0.000 claims description 28
- 230000001105 regulatory effect Effects 0.000 claims description 25
- 239000007921 spray Substances 0.000 claims description 19
- 238000003860 storage Methods 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 12
- 230000007613 environmental effect Effects 0.000 abstract description 9
- 238000010531 catalytic reduction reaction Methods 0.000 abstract description 6
- 230000004044 response Effects 0.000 abstract description 6
- 230000003111 delayed effect Effects 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 239000007788 liquid Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 7
- 230000008859 change Effects 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000006477 desulfuration reaction Methods 0.000 description 5
- 230000023556 desulfurization Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000010926 purge Methods 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 206010037544 Purging Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000009692 water atomization Methods 0.000 description 1
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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
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- General Chemical & Material Sciences (AREA)
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Abstract
The invention provides a low-temperature flue gas denitration system and a low-temperature flue gas denitration method for gas power generation, wherein the system comprises a denitration agent solution forming device, a denitration agent solution pressure feeding assembly, an air atomization assembly and a spraying assembly, wherein the denitration agent solution forming device is used for mixing a denitration agent stock solution and water in proportion to form a denitration agent solution; the denitration agent solution pressure-feeding assembly is used for pressure-feeding the denitration agent solution to the spraying assembly; the air atomization assembly is used for atomizing the denitration agent solution; and the spraying assembly is used for spraying the atomized denitration agent solution into the flue, and the sprayed denitration agent solution and the flue gas in the flue are subjected to catalytic reaction. The invention can solve the problems of substandard environmental protection, delayed response time and the like existing in the prior catalytic reduction method denitration such as SNCR, SCR, SNCR + SCR and the like.
Description
Technical Field
The invention relates to the field of comprehensive application of intelligent steel manufacturing technology, in particular to a low-temperature flue gas denitration system and method for gas power generation.
Background
Steel and iron are used as the process production industry, and the high-temperature furnace kiln is used in the production and manufacturing processIn many cases, the combustion process generates corresponding NOx emission, including gas-turbine generator sets in steel mills. At present, according to national atmospheric treatment and the ultra-low emission requirement of steel environmental protection, relevant equipment can enable emission to meet the current national directive environmental protection requirement by adding relevant measures. However, in the actual production process, because the gas generated in the blast furnace production process is used by the steel mill gas generator set, when the furnace condition fluctuation airflow is unstable, the existing denitration measures cannot meet the requirement of NO in the flue gas x The discharge is less than or equal to 50mg/m which meets the national regulation 3 The requirements of (1).
At present, catalytic reduction denitration technologies such as SNCR (selective non-catalytic reduction), SCR (selective catalytic reduction), and SNCR + SCR are widely used denitration technologies. However, in the actual production, the requirement for the change of the special working condition of the blast furnace is that the standard exceeding is less than or equal to 400mg/m 3 The SNCR cannot meet the requirement; the SNCR + SCR and the SCR need to ensure the number of catalyst layers, the change rate of a special working condition is high, the response time of system design to response needs 6 minutes, and the response speed is delayed.
The following cases can be seen: the gas generator set of a certain factory is a generator set taking blast furnace gas as fuel, and the installation is 35MW. The unit is a complementary energy generator unit coupled with blast furnace generated gas of a steel mill as fuel, and simultaneously reduces the environmental pollution to the atmosphere caused by the gas emission. Under normal operating mode, the design has the low NOx burner can satisfy among the combustion process: thermal NO x Fast NO x Fuel type NO x The nitrogen oxide discharged from the chimney of the generator set is 50mg/m regulated by the state 3 The following. However, under the working conditions of material turnover and unstable airflow, the NO content in blast furnace gas is suddenly increased under uncertain conditions, so that the nitrogen oxide discharged by a chimney can be quickly controlled to 50mg/m specified by the state under the condition that low-temperature flue gas with the tail part of less than or equal to 150 ℃ is stable to sudden change working conditions in a high-temperature combustion boiler and furnace kiln system represented by gas power generation in a steel mill 3 The method does not need to reduce load and stop, and is beneficial to social environmental protection and enterprise economyAnd (5) performing exhibition work.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a low-temperature flue gas denitration system and method for gas power generation, so as to solve the problems of substandard environmental protection, delayed response time, etc. existing in the denitration by the catalytic reduction methods such as SNCR, SCR, SNCR + SCR, etc.
The invention provides a low-temperature flue gas denitration system for gas power generation, which comprises: a denitrifier solution forming device, a denitrifier solution pressure feeding assembly, an air atomizing assembly and a spraying assembly, wherein,
the denitration agent solution forming device is used for mixing the denitration agent stock solution and water according to a proportion to form a denitration agent solution;
the denitration agent solution pressure-feed assembly is used for pressure-feeding the denitration agent solution to the injection assembly;
the air atomization assembly is used for atomizing the denitration agent solution;
the spraying assembly is used for spraying the atomized denitration agent solution into the flue, and the sprayed denitration agent solution and the flue gas in the flue are subjected to catalytic reaction.
In addition, it is preferable that the denitration agent solution forming apparatus includes a raw solution storage tank, a raw solution pressure feed pump, a hydraulic pressure feed pump, and a mixing tank, wherein,
the stock solution storage tank is used for storing the denitration agent stock solution;
the stock solution pressure-feed pump is used for conveying the denitration agent stock solution in the stock solution storage tank to the mixing tank;
the water pressure feed pump is used for feeding water into the mixing tank under pressure;
the mixing tank is used for mixing the denitration agent stock solution and the water according to a preset proportion to form the denitration agent solution.
In addition, it is preferable that a supply port is provided in the raw liquid storage tank, and the raw denitration agent liquid is supplied to the raw liquid storage tank through the supply port.
In addition, it is preferable that the denitration agent solution pressure-feed unit includes a solution pressure-feed pump, a solution pressure-feed pressure gauge, a solution pressure-regulating valve, and a solution pressure-feed line, wherein,
the solution pressure-feed pump is used for providing power for pressure-feeding the denitrifier solution;
the solution pressure-feeding pressure gauge is used for detecting the pressure for pressure-feeding the denitrifier solution;
the solution pressure regulating valve is used for regulating the pressure of the denitration agent solution fed under pressure;
and the solution pressure conveying pipeline is used for conveying the denitration agent solution.
Further, it is preferable that a solution pressure isolating valve is provided on the solution pressure feed line, wherein,
and the solution pressure isolation valve is used for isolating the denitration agent solution from catalytic reaction with the flue gas in the flue.
In addition, it is preferable that the air atomization assembly includes an air pressure feed line, an air pressure regulating valve, an air pressure gauge, and an air nozzle, wherein,
the air pressure feed pipeline is used for conveying air which is subjected to an atomization reaction with the denitrifier solution;
the air pressure gauge is used for detecting the pressure of the air;
the air pressure regulating valve is used for regulating the pressure of the air;
the air spray head is used for spraying the air into the denitration agent solution, so that the air and the denitration agent solution are subjected to an atomization reaction.
In addition, it is preferable that an air pressure isolating valve is provided on the air pressure pipe, wherein,
and the air pressure isolation valve is used for isolating the atomization reaction of air and the denitrifier solution.
Further, it is preferable that the injection module includes an injection line isolation valve, an injection line pressure gauge, and a solution spray head, wherein,
the injection pipeline isolation valve is used for isolating the injection of the denitration agent solution;
the injection pipeline pressure gauge is used for detecting the pressure of the denitration agent solution;
the solution sprayer is used for spraying the denitration agent solution, and the sprayed denitration agent solution and the air are subjected to an atomization reaction.
Preferably, the system further comprises a flue gas flow meter, wherein,
and the flue gas flowmeter is used for detecting the flow of flue gas in the flue.
Preferably, the system further comprises a purge line isolation valve, wherein,
and cleaning the solution pressure feeding pipeline and the solution spray head by opening the cleaning pipeline isolation valve.
The invention also provides a gas power generation low-temperature flue gas denitration method, which is used for denitration of flue gas by adopting the gas power generation low-temperature flue gas denitration system and specifically comprises the following steps:
mixing the denitrifier stock solution and water according to a ratio to form a denitrifier solution;
atomizing a proper amount of denitration agent solution according to the catalytic reaction requirement;
spraying the atomized denitrifier solution into a flue, and carrying out catalytic reaction on the sprayed denitrifier solution and flue gas in the flue to generate NO x 。
In addition, it is preferable that the denitration agent solution is atomized by an air atomization assembly when the atomization pressure is more than 0.4 Mpa.
In addition, it is preferable that the atomized denitration agent solution is sprayed through a spray module when the spray pressure is greater than 0.4 Mpa.
According to the technical scheme, compared with the prior art, the low-temperature flue gas denitration system and method for gas power generation provided by the invention can obtain the following beneficial effects:
1) Under the condition of not influencing the existing gas power generation system, nitrogen oxides in the flue gas caused by quality change of the upstream gas are quickly treated, and the tail gas is ensured to be discharged up to the standard;
2) The existing facility resources are utilized, a low-temperature denitration system is rapidly added on line, shutdown gas diffusion is avoided, and good economic benefit and environmental protection benefit are realized;
3) The system provided by the invention aims at the denitration of the flue gas at the low-temperature section of the gas power generation, the flue gas does not need to be heated to meet the SCR temperature requirement, and the energy is saved;
4) The denitration system can adapt to the change of production line operating mode, fast, high-efficient the requirement that the minimum emission of SOx/NOx control is satisfied.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and readily appreciated by reference to the following description taken in conjunction with the accompanying drawings, as the invention becomes more fully understood. In the drawings:
FIG. 1 is a schematic structural diagram of a low-temperature flue gas denitration system for gas power generation according to an embodiment of the invention;
FIG. 2 is a schematic diagram illustrating the installation of a low-temperature flue gas denitration system for gas power generation according to an embodiment of the invention;
FIG. 3 is a schematic flow chart of a low-temperature flue gas denitration method for gas power generation according to an embodiment of the invention;
fig. 4 is a schematic execution diagram of a low-temperature flue gas denitration method for gas power generation according to an embodiment of the invention.
Wherein the reference numerals include: 01. the device comprises an air pressure isolation valve 02, an air pressure adjusting valve 03, an air pressure gauge 04, an air pressure feeding pipeline 05, a solution pressure feeding pipeline 06, a solution spray head 07, an injection pipeline isolation valve 08, an injection pipeline pressure gauge 09, an air spray head 10, outlet flue gas of a gas heater device 11, a flue gas flowmeter 12, a flue gas desulfurization device 13, outlet flue gas of a desulfurization device 14, a flue gas bag dust removal device 15 and a flue gas discharge chimney; 16. the method comprises the following steps of (1) carrying out pressure measurement on solution by using a draught fan outlet flue gas pressure gauge (17), a draught fan (18), flue gas at the outlet of a flue gas bag dust removal device (19), a solution pressure regulating valve (20), a solution pressure isolating valve (21), a solution pressure pump (22), a solution pressure pump (23) and a mixing tank; 24. a water pressure feed pump 25, a stock solution pressure feed pump 26, a stock solution storage tank 27, a supply interface 28, a cleaning pipeline isolation valve 29, a boiler 30, a flue 31, a controller 32, a denitrifier pressure 33 and a flue low-temperature section.
The same reference numbers in all figures indicate similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Aiming at the problems that the existing catalytic reduction methods for denitration by SNCR, SCR, SNCR + SCR and the like do not meet the environmental protection standard and have time delay in response time, the invention provides a low-temperature flue gas denitration system and method for gas power generation.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In order to explain the structure of the low-temperature flue gas denitration system for gas power generation provided by the invention, fig. 1 shows the low-temperature flue gas denitration system for gas power generation according to the embodiment of the invention.
As shown in fig. 1, the low-temperature flue gas denitration system for gas power generation provided by the invention comprises a denitration agent solution forming device, a denitration agent solution pressure-feed assembly, an air atomization assembly and a spray assembly, wherein the denitration agent solution forming device is used for mixing a denitration agent stock solution and water according to a ratio to form a denitration agent solution; the denitration agent solution pressure-feed assembly is used for pressure-feeding the denitration agent solution to the injection assembly; the air atomization assembly is used for atomizing the denitration agent solution; the spraying assembly is used for spraying the atomized denitration agent solution into the flue, and the sprayed denitration agent solution and the flue gas in the flue are subjected to catalytic reaction.
In an embodiment of the present invention, the denitration agent solution forming device includes a stock solution storage tank 26, a stock solution pressure feed pump 25, a water pressure feed pump 24 and a mixing tank 23, wherein the stock solution storage tank 26 is used for storing the denitration agent stock solution; the raw liquid pressure-feed pump 25 is used for conveying the denitration agent raw liquid in the raw liquid storage tank to the mixing tank 23; the hydraulic pump 24 for sending water pressure to the mixing tank 23; the mixing tank 23 is configured to mix the denitration agent stock solution with the water according to a preset ratio to form the denitration agent solution.
A supply interface 27 is provided on the raw liquid storage tank 26, and the raw liquid of the denitrating agent is input into the raw liquid storage tank 26 through the supply interface 27.
In an embodiment of the invention, the denitration agent solution pressure-feed assembly comprises a solution pressure-feed pump 22, a solution pressure-feed pressure gauge 19, a solution pressure regulating valve 20 and a solution pressure-feed pipeline 05, wherein the solution pressure-feed pump 22 is used for providing power for pressure-feeding the denitration agent solution; the solution pressure-feed pressure gauge 19 for detecting the pressure at which the denitration agent solution is pressure-fed; the solution pressure regulating valve 20 is used for regulating the pressure of the denitration agent solution fed under pressure; and the solution pressure-feeding pipeline 05 is used for conveying the denitration agent solution.
The solution pressure feed pipeline 05 is provided with a solution pressure isolation valve 21, wherein the solution pressure isolation valve 21 is used for isolating the denitration agent solution from catalytic reaction with the flue gas in the flue.
In the embodiment of the invention, the air atomization assembly comprises an air pressure feed pipeline 04, an air pressure regulating valve 02, an air pressure gauge 03 and an air spray nozzle 09, wherein the air pressure feed pipeline 04 is used for conveying air which is subjected to atomization reaction with the denitration agent solution; the air pressure gauge 03 is used for detecting the pressure of the air; the air pressure adjusting valve 02 for adjusting the pressure of the air; the air spray nozzle 09 is configured to spray the air into the denitration agent solution, so that the air and the denitration agent solution generate an atomization reaction.
Wherein an air pressure isolating valve 01 is arranged on the air pressure feeding pipeline 04, wherein,
and the air pressure isolating valve 01 is used for isolating the atomization reaction of air and the denitrifier solution.
In an embodiment of the present invention, the injection assembly includes an injection line isolation valve 07, an injection line pressure gauge 08 and a solution spray head 06, where the injection line isolation valve 07 is used for isolating the denitration agent solution from being sprayed; the injection pipeline pressure gauge 08 is used for detecting the pressure of the denitration agent solution; and the solution spray nozzle 06 is used for spraying the denitration agent solution, and the sprayed denitration agent solution and the air are subjected to an atomization reaction.
In addition, in the embodiment of the present invention, the gas power generation low-temperature flue gas denitration system further includes a flue gas flow meter 11 and a cleaning pipe isolation valve 28, where the flue gas flow meter 11 is configured to detect a flue gas flow rate in the flue. The solution pressure feed line 05 and the solution spray head 06 are cleaned by opening the cleaning line isolation valve 28.
In the embodiment of the present invention, the air pressure isolating valve 01 is opened, and the air pressure adjusting valve 02 adjusts the air pressure of the air nozzle 09 according to the pressure value displayed by the air pressure gauge 03. Inputting the denitrifier stock solution into the stock solution storage tank 26 through a supply interface 27 on the stock solution storage tank 26, and delivering the stock solution to the mixing tank 23 for dilution and proportioning as required through a stock solution pressure-feed pump 25; pure water is fed to the mixing tank 23 as required by the water pressure feed pump 24 to be diluted and proportioned, thereby forming a denitration agent solution.
The denitration agent solution is delivered to a solution nozzle 06 through a solution pressure delivery pipeline 05 by a solution pressure delivery pump 22 and is subjected to catalytic denitration reaction with the outlet flue gas 10 of the gas heater device; the solution pressure isolation valve 21 can effectively isolate the position of conveying the solution to the solution spray head 06 during system maintenance; the solution pressure regulating valve 20 regulates the flow rate of the solution based on the solution pressure feed pressure gauge 19 so that the solution matches the flue gas calculated by the flue gas flow meter 11.
In the embodiment shown in fig. 1, the flue gas desulfurization device 12 and the flue gas bag-type dust collector 14 are cascade environment-friendly denitration flue gas disposal devices; the flue gas 13 at the outlet of the desulfurization device is dedusted by a flue gas bag dedusting device 14, the flue gas 18 at the outlet of the flue gas bag dedusting device passes through a draught fan 17, and the flue gas 16 at the outlet of the draught fan is discharged into a flue gas discharge chimney 15 and enters the atmosphere, so that the environmental protection reaches the standard.
In the embodiment shown in fig. 1, the injection pipeline pressure gauge 08 is used for detecting whether the solution sprayer 06 is normally blocked or not, and once the abnormality is found, the solution sprayer 06 can be repaired or replaced by closing the injection pipeline isolation valve 07, so that the intelligent and efficient denitration of the system is ensured. After the system performs denitration, the cleaning pipeline isolation valve 28 is opened, and the solution pressure feed pipeline 05 and the solution sprayer 06 are subjected to water atomization washing to prevent scaling.
Fig. 2 shows that the gas power generation low temperature flue gas denitration system is in the mounting structure, as shown in fig. 2, the flue 30 that the boiler 29 produced the flue gas and flowed through, calculate present flue gas through the controller 31 of gas power generation low temperature flue gas denitration system, adjust denitration agent pressure 32 through solution pressure isolation valve 21 and solution pressure regulating valve 20, adjust denitration agent pressure 32, increase and decrease the medicament injection volume. According to the pressure 32 of the denitrifying agent, the air spray nozzle 09 is adjusted through the air pressure isolating valve 01 and the air pressure adjusting valve 02, and the spraying amount of air for atomization is increased or decreased; the cleaning pipeline isolation valve 28 is opened to clean the solution pressure feed pipeline and the solution spray head, and the temperature of the low-temperature section of the flue is ensured to be less than or equal to 150 ℃ during the catalytic reaction.
Corresponding to the system, the invention also provides a gas power generation low-temperature flue gas denitration method, and fig. 3 shows a flow of the gas power generation low-temperature flue gas denitration method according to the embodiment of the invention.
As shown in fig. 3, the low-temperature flue gas denitration method for gas power generation provided by the invention adopts the low-temperature flue gas denitration system for gas power generation to denitrate flue gas, and the method specifically comprises the following steps:
s310: mixing the denitrifier stock solution and water according to a ratio to form a denitrifier solution;
s320: atomizing a proper amount of denitration agent solution according to the catalytic reaction requirement;
s330: spraying the atomized denitrifier solution into a flue, and carrying out catalytic reaction on the sprayed denitrifier solution and flue gas in the flue to generate NO x 。
In the embodiment of the invention, when the atomization pressure reaches 0.4Mpa, the denitration agent solution is atomized by the air atomization assembly. And when the injection pressure reaches 0.4Mpa, spraying the atomized denitration agent solution by using a spraying assembly.
Specifically, in the embodiment of the present invention, the problem of ultra-low temperature and high-efficiency NOx removal is solved, and the denitration by catalytic reaction, the desulfurization and the dust removal are performed first, and the method includes a denitration agent solution preparation stage, a catalytic reaction stage and a catalytic completion system purging stage, and the specific implementation process is as shown in fig. 4:
firstly, the method comprises the following steps: preparation stage of denitrating agent solution
Starting a stock solution pressure feed pump 25 and a water pressure feed pump 24, and proportionally and pressure-feeding the denitrifier stock solution and water into a mixing tank 23 for mixing; when the mixing tank 23 is mixed to 2m and can meet the denitration requirement, the stock solution pressure-feed pump 25 and the water pressure-feed pump 24 are closed, and the preparation of the denitration agent solution is completed.
Second, preparation stage of catalytic reaction
Opening an air pressure isolating valve 01 and an air pressure regulating valve 02, and regulating the pressure in an air pressure feed pipeline 04 to 0.4Mpa; after the air pressure isolation valve 01 and the air pressure regulating valve 02 are opened, the jet flow atomization capacity of the injection pipeline is checked, the pressure of the injection pipeline reaches 0.4Mpa, the normal atomization loop is determined, and otherwise, corresponding check is required.
Third, catalytic reaction stage
Opening the solution pressure feed pump and the solution pressure regulating valve 20, regulating the pressure in the solution pressure feed pipeline 05 to 0.4Mpa, performing catalytic denitration work of mixing the denitration agent solution and the flue gas in the flue, and reducing NO discharged from the flue gas X ≤50mg/m 3 When the denitration is finished, the opening degree of the pressure regulating valve is interlocked, and the solution pressure isolation valve 21 is closed after delaying for 10 minutes; the solution force-feed pump was closed and the air pressure isolation valve was closed.
Fourth, the catalyst completes the system purge phase
And (3) opening the water pressure feed pump and the cleaning pipeline isolation valve 28, purging for 5 minutes, closing the water pressure feed pump and the cleaning pipeline isolation valve, and finishing the low-temperature denitration work of the flue gas system.
According to the embodiment, the low-temperature flue gas denitration system and method for gas power generation provided by the invention can quickly treat nitrogen oxides in flue gas caused by quality change of upstream gas under the condition that the existing gas power generation system is not influenced, and ensure that tail gas reaches the standard and is discharged; the existing facility resources are utilized, a low-temperature denitration system is rapidly added on line, shutdown gas diffusion is avoided, and good economic benefit and environmental protection benefit are realized; the system provided by the invention aims at denitration of flue gas at a low-temperature section of gas power generation, and the flue gas does not need to be heated to meet the SCR temperature requirement, so that energy is saved; the denitration system can adapt to the change of production line operating mode, fast, high-efficient the requirement that the minimum emission of SOx/NOx control is satisfied.
The low-temperature flue gas denitration system and method for gas power generation proposed by the present invention are described above by way of example with reference to the accompanying drawings. However, it should be understood by those skilled in the art that various modifications can be made to the low-temperature flue gas denitration system and method for gas power generation provided by the invention without departing from the scope of the invention. Accordingly, the scope of the invention should be determined from the content of the appended claims.
Claims (13)
1. The utility model provides a gas power generation low temperature flue gas deNOx systems which characterized in that includes: a denitrifier solution forming device, a denitrifier solution pressure feeding assembly, an air atomizing assembly and a spraying assembly, wherein,
the denitration agent solution forming device is used for mixing the denitration agent stock solution and water according to a proportion to form a denitration agent solution;
the denitration agent solution pressure-feed assembly is used for pressure-feeding the denitration agent solution to the injection assembly;
the air atomization assembly is used for atomizing the denitration agent solution;
the spraying assembly is used for spraying the atomized denitration agent solution into the flue, and the sprayed denitration agent solution and the flue gas in the flue are subjected to catalytic reaction.
2. The gas power generation low-temperature flue gas denitration system of claim 1,
the denitration agent solution forming device comprises a stock solution storage tank, a stock solution pressure feed pump, a water pressure feed pump and a mixing tank, wherein,
the stock solution storage tank is used for storing the denitration agent stock solution;
the stock solution pressure-feed pump is used for conveying the denitration agent stock solution in the stock solution storage tank to the mixing tank;
the hydraulic pump is used for conveying water into the mixing tank under pressure;
the mixing tank is used for mixing the denitration agent stock solution and the water according to a preset proportion to form the denitration agent solution.
3. The gas-fired power generation low-temperature flue gas denitration system of claim 2,
and a supply interface is arranged on the stock solution storage tank, and the denitration agent stock solution is input into the stock solution storage tank through the supply interface.
4. The gas power generation low-temperature flue gas denitration system of claim 1,
the denitrifier solution pressure feeding assembly comprises a solution pressure feeding pump, a solution pressure feeding pressure gauge, a solution pressure regulating valve and a solution pressure feeding pipeline, wherein,
the solution pressure-feed pump is used for providing power for pressure-feeding the denitrifier solution;
the solution pressure-feeding pressure gauge is used for detecting the pressure for pressure-feeding the denitrifier solution;
the solution pressure regulating valve is used for regulating the pressure of the denitration agent solution fed under pressure;
and the solution pressure conveying pipeline is used for conveying the denitrifier solution.
5. The gas power generation low-temperature flue gas denitration system of claim 4,
a solution pressure isolating valve is arranged on the solution pressure pipeline, wherein,
and the solution pressure isolation valve is used for isolating the denitration agent solution from catalytic reaction with the flue gas in the flue.
6. The gas power generation low-temperature flue gas denitration system of claim 1,
the air atomization assembly comprises an air pressure feeding pipeline, an air pressure regulating valve, an air pressure gauge and an air nozzle, wherein,
the air pressure feed pipeline is used for conveying air which is subjected to an atomization reaction with the denitrifier solution;
the air pressure gauge is used for detecting the pressure of the air;
the air pressure regulating valve is used for regulating the pressure of the air;
the air spray head is used for spraying the air into the denitration agent solution, so that the air and the denitration agent solution are subjected to an atomization reaction.
7. The gas power generation low-temperature flue gas denitration system of claim 6,
an air pressure isolating valve is arranged on the air pressure pipeline, wherein,
and the air pressure isolation valve is used for isolating the atomization reaction between air and the denitration agent solution.
8. The gas-fired power generation low-temperature flue gas denitration system of claim 6,
the injection assembly comprises an injection pipeline isolation valve, an injection pipeline pressure gauge and a solution nozzle, wherein,
the injection pipeline isolation valve is used for isolating the injection of the denitration agent solution;
the injection pipeline pressure gauge is used for detecting the pressure of the denitration agent solution;
the solution sprayer is used for spraying the denitration agent solution, and the sprayed denitration agent solution and the air are subjected to an atomization reaction.
9. The gas-fired power generation low-temperature flue gas denitration system of claim 1, further comprising a flue gas flow meter, wherein,
and the flue gas flowmeter is used for detecting the flow of flue gas in the flue.
10. The gas power generation low-temperature flue gas denitration system of claim 8, further comprising a cleaning pipe isolation valve, wherein,
and cleaning the solution pressure feed pipeline and the solution spray head by opening the cleaning pipeline isolation valve.
11. A low-temperature flue gas denitration method for gas power generation, which is used for denitration of flue gas by the low-temperature flue gas denitration system for gas power generation as claimed in any one of claims 1 to 10, and comprises the following specific steps:
mixing the denitration agent stock solution and water according to a ratio to form a denitration agent solution;
atomizing a proper amount of denitration agent solution according to the catalytic reaction requirement;
spraying the atomized denitrifier solution into a flue, and carrying out catalytic reaction on the sprayed denitrifier solution and flue gas in the flue to generate NO x 。
12. The gas power generation low-temperature flue gas denitration method of claim 11, wherein when the atomization pressure is more than 0.4Mpa, the denitration agent solution is atomized by an air atomization assembly.
13. The gas power generation low-temperature flue gas denitration method of claim 11, wherein the atomized denitration agent solution is sprayed by a spraying assembly when the spraying pressure is more than 0.4 Mpa.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0474513A (en) * | 1990-07-13 | 1992-03-09 | Hitachi Zosen Corp | Simultaneous desulfurization and denitration in furnace |
| CN204973521U (en) * | 2015-07-14 | 2016-01-20 | 河北诚誉喷雾技术有限公司 | SNCR+SCR unites denitrification facility |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0474513A (en) * | 1990-07-13 | 1992-03-09 | Hitachi Zosen Corp | Simultaneous desulfurization and denitration in furnace |
| CN204973521U (en) * | 2015-07-14 | 2016-01-20 | 河北诚誉喷雾技术有限公司 | SNCR+SCR unites denitrification facility |
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Application publication date: 20221108 |