CN109059012B - Ground torch closed combustor exhaust gas denitration system and method - Google Patents
Ground torch closed combustor exhaust gas denitration system and method Download PDFInfo
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- CN109059012B CN109059012B CN201810938076.7A CN201810938076A CN109059012B CN 109059012 B CN109059012 B CN 109059012B CN 201810938076 A CN201810938076 A CN 201810938076A CN 109059012 B CN109059012 B CN 109059012B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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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
- F23J13/00—Fittings for chimneys or flues
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/005—Regulating fuel supply using electrical or electromechanical means
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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
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chimneys And Flues (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The present disclosure provides a ground flare closed burner evacuation gas denitration system and method, wherein the evacuation gas denitration system includes: the device comprises SCR denitration equipment, a first branch pipe, a first pneumatic valve, a gas pipe, a second pneumatic valve, a second branch pipe and a third pneumatic valve; the air inlet of the SCR denitration device is connected with the second end of the burner exhaust pipeline, and the air outlet of the SCR denitration device is connected with the emptying gas pipeline; the first branch pipe is connected with a burner air inlet pipeline and a burner exhaust pipeline; the first pneumatic valve is arranged on the first branch pipe; the gas pipe is connected with the first branch pipe; the second pneumatic valve is arranged on the gas pipe; the second branch pipe is connected with the emptying gas pipeline and the burner; the third pneumatic valve is disposed on the second branch pipe. The present disclosure is effective in reducing NO x And the discharge amount and the production cost of the waste gas can be effectively utilized.
Description
Technical Field
The disclosure relates to the field of burner waste gas treatment, in particular to a ground torch closed burner exhaust gas denitration system and method.
Background
With the increasing deterioration of global environment and the increasing environmental awareness, NO in exhaust gas discharged from chemical plants x And pollution of PM and the like to the atmospheric environment have attracted extensive attention from the international society. At present, petrochemical industry rapidly develops, and petroleum refining, chemical industry, plastic and other petrochemical and subsequent production devices, because of the scale and mutual connection of the production devices, a large amount of flare gas can be discharged during start-up and shutdown, normal production and accident emission. The flare gas is waste gas generated in the production process of petrochemical industry, and belongs to flammable, explosive, toxic and harmful gases, such as CH 4 、CH 3 OH、NH 3 、O 2 、H 2 S、H 2 Etc. Because of its extremely harmful nature, to ensure production equipmentThe system is stable and safe, a direct emptying mode cannot be adopted, a torch system is required to be arranged for timely and safe combustion treatment, and an overhead torch system or a ground torch system is widely adopted as the treatment mode.
With the development of greenhouse gas emission reduction and carbon dioxide international transaction process, the combustion treatment of the combustible waste gas by using a ground torch is started at home so as to fulfill the aims of efficient combustion and monitorable combustion state. Compared with an overhead torch, the ground torch has the characteristics of small occupied area, high burnout rate, convenient maintenance, no light pollution, low noise, small heat radiation and the like. The exhaust gas has complex components, and has high-pressure flame gas and ultra-low-pressure flare gas, conventional hydrocarbon gas and corrosive gas, and the single-barrel ground flare treatment capacity is generally less than or equal to 100t/h. The flare gas is burnt in the burner in a grading way, high-energy spark ignition is adopted, the body of the ground closed burner is cylindrical, and the complete closed combustion process can be realized, so that flame leakage during combustion is avoided, and no fire light exists outside, thereby avoiding light pollution and reducing heat radiation. The ground burner is cylindrical, is not influenced by temperature and rainwater, and has good noise reduction and sound absorption performances. Therefore, the flare gas burns in a closed space, and the effects of rain prevention, heat insulation, noise reduction and the like are achieved, so that the influence of the burning process on the environment is reduced to the minimum. In the ground torch closed burner, the highest temperature of the burning center of the burner can reach above 1850 ℃.
Due to the large waste gas treatment capacity and the diversity of combustion gases, other toxic and harmful gases including soot and NO can be secondarily generated after combustion in the current ground torch burner x Etc. N in the burner under high temperature and oxygen-enriched conditions 2 Will be combined with O 2 Generates NO by reaction in the combustion chamber, and the NO is rapidly oxidized into NO 2 ，NO x Is an acid-forming gas, an important precursor for photochemical smog generation, and fine particles (PM 10/PM 2.5) formed by the acid-forming gas can cause the generation of haze weather, so that NO must be strictly controlled x Is arranged in the air. In addition, the treatment of waste gas and ammonia emission by using a ground flare burner also appears in the domestic chemical plant at presentOnly ammonia is contained, and the combustion of the ammonia is directly carried out in the burner. At present, few technology related to the treatment of ground torch exhaust gas is in use, so that more intensive research on denitration treatment of exhaust gas after combustion of a combustor is needed.
Disclosure of Invention
First, the technical problem to be solved
The present disclosure provides a ground flare closed combustor evacuation gas denitration system and method to at least partially solve the technical problems set forth above.
(II) technical scheme
According to one aspect of the present disclosure, there is provided a ground flare closed burner exhaust gas denitration system, the ground flare closed burner being provided with a burner inlet and a burner outlet, flare gas entering the ground flare closed burner through the burner inlet, the burner inlet being connected to a burner inlet line, the burner outlet being connected to a burner outlet line; wherein, ground torch closed combustor evacuation gas denitration system includes: the first end of the first branch pipe is connected with the burner air inlet pipeline, and the second end of the first branch pipe is connected with the burner exhaust pipeline; the SCR denitration device is provided with an air inlet of the SCR denitration device and an air outlet of the SCR denitration device; the air inlet of the SCR denitration device is connected with the second end of the burner exhaust pipeline, and the air outlet of the SCR denitration device is connected with the emptying gas pipeline; the first pneumatic valve is arranged on the first branch pipe and used for controlling the input of flare gas in the first branch pipe to SCR denitration equipment; the gas transmission pipe is connected with the first branch pipe; the second pneumatic valve is arranged on the gas pipe and used for controlling the input of NH3 to the first branch pipe through the gas pipe; the first end of the second branch pipe is connected with the emptying gas pipeline, and the second end of the second branch pipe is connected with the burner; and the third pneumatic valve is arranged on the second branch pipe.
In some embodiments of the present disclosure, an SCR denitration apparatus includes: a rectification grating, a first stage catalytic layer and a second stage catalytic layer; the rectification grating, the first-stage catalytic layer and the second-stage catalytic layer are arranged in the SCR denitration device, and are sequentially arranged from an air inlet of the SCR denitration device to an air outlet of the SCR denitration device.
In some embodiments of the present disclosure, the SCR denitration apparatus further includes: and the standby catalytic layer is arranged between the second-stage catalytic layer and the exhaust port of the SCR denitration device.
In some embodiments of the present disclosure, further comprising: the guide plate is arranged on the exhaust pipeline of the burner.
In some embodiments of the present disclosure, the first pneumatic valve, the second pneumatic valve, and the third pneumatic valve are pneumatic butterfly valves.
According to another aspect of the present disclosure, there is provided a ground flare closed burner evacuation gas denitration method, including: the flare gas is introduced into a burner for combustion; the first pneumatic valve is closed, the second pneumatic valve is opened, and NH3 introduced through the gas transmission pipe is converged with the flue gas exhausted through the burner exhaust pipeline through the first branch pipe to form mixed gas; the mixed gas enters SCR denitration equipment to be subjected to denitration, and is emptied through an emptying gas pipeline.
According to another aspect of the present disclosure, there is provided a ground flare closed burner evacuation gas denitration method, including: the flare gas is introduced into the burner for burning, the first pneumatic valve is opened, and the flare gas enters the first branch pipe; the second pneumatic valve is opened, and the flare gas entering the first branch pipe is converged with NH3 introduced by the gas transmission pipe; then the mixed gas is formed by mixing the first branch pipe with the flue gas exhausted by the burner exhaust pipe; the mixed gas enters SCR denitration equipment to be subjected to denitration, a third pneumatic valve is opened, and the mixed gas flows back to the combustor through a second branch to burn out.
(III) beneficial effects
According to the technical scheme, the system and the method for denitration of the emptying gas of the closed type combustor of the ground torch have at least one or a part of the following beneficial effects:
(1) The present disclosure is capable of effectively handling NO from flare combustion X Emissions, and thus improve the air environment of the chemical plant and the surroundings.
(2) The SCR denitration device is easy to refit, has low reaction temperature, does not contain noble metal, has long service life, and can be suitable for various working conditions and various exhaust emissions.
(3) The closed burner of the ground torch can effectively utilize NH in the waste gas 3 NH produced by chemical plant 3 As a reducing agent, the raw materials are sufficient, convenient and easy to obtain, the cost is low, and the denitration and emission reduction can be realized while the flare gas treatment capacity is reduced and the efficiency is improved.
(4) The pneumatic butterfly valve is selected for control, so that the action reaction is rapid, the reliability is good, and the leakage is not easy.
(5) The guide plates can enable the distribution of the smoke in the longitudinal direction to be more uniform, and meanwhile, the movement of the smoke can be guided by changing the size and the shape of the guide plates.
Drawings
Fig. 1 is a schematic structural diagram of an exhaust gas denitration system of a ground torch closed burner according to an embodiment of the disclosure.
Fig. 2 is a schematic flow chart of a method for denitrating exhaust gas of a closed type burner of a ground torch according to a first embodiment of the present disclosure.
Fig. 3 is a schematic flow chart of a method for denitrating exhaust gas of a closed type burner of a ground torch according to a second embodiment of the present disclosure.
[ in the drawings, the main reference numerals of the embodiments of the present disclosure ]
10-a burner;
11-burner air inlet;
12-burner exhaust;
20-a burner air inlet line;
30-a burner exhaust line;
31-a deflector;
40-a first branch pipe;
41-a first pneumatic valve;
50-a gas pipe;
51-second pneumatic valve
60-SCR denitration equipment;
61-rectifying grille
64-a first stage catalytic layer;
62-a second stage catalytic layer;
63-a backup catalytic layer;
70-a second branch pipe;
71-a third pneumatic valve;
80-venting the gas line.
Detailed Description
The present disclosure provides a ground flare closed burner exhaust gas denitration system and method, wherein the ground flare closed burner exhaust gas denitration system includes: the device comprises a burner, a burner air inlet pipeline, a burner exhaust pipeline, a first branch pipe, SCR denitration equipment, a first pneumatic valve, an air pipe, a second pneumatic valve, a second branch pipe and a third pneumatic valve; the burner is provided with a burner air inlet and a burner air outlet; the flare gas enters the burner through the burner gas inlet; the burner air inlet pipeline is connected with the burner air inlet; the first end of the burner exhaust pipeline is connected with the burner exhaust port; the first end of the first branch pipe is connected with a burner air inlet pipeline, and the second end of the first branch pipe is connected with a burner air outlet pipeline; the SCR denitration device is provided with an SCR denitration device air inlet and an SCR denitration device air outlet; the air inlet of the SCR denitration device is connected with the second end of the burner exhaust pipeline, and the air outlet of the SCR denitration device is connected with the emptying gas pipeline; the first pneumatic valve is arranged on the first branch pipe and used for controlling the input of flare gas in the first branch pipe to SCR denitration equipment; the gas pipe is connected with the first branch pipe; the second pneumatic valve is arranged on the gas pipe and controls the input of NH3 to the first branch pipe through the gas pipe; the first end of the second branch pipe is connected with an emptying gas pipeline, and the second end of the second branch pipe is connected with the burner; the third pneumatic valve is disposed on the second branch pipe.
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same.
Certain embodiments of the present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments are shown. Indeed, various embodiments of the disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.
In one exemplary embodiment of the present disclosure, a floor torch closed burner exhaust gas denitration system is provided. Fig. 1 is a schematic structural diagram of an exhaust gas denitration system of a ground torch closed burner according to an embodiment of the disclosure. As shown in fig. 1, the ground flare closed combustor evacuation gas denitration system includes: the burner 10, the burner intake line 20, the burner exhaust line 30, the first branch line 40, the SCR denitration device 60, the first air valve 41, the air delivery pipe 50, the second air valve 51, the second branch line 70, and the third air valve 71; the burner 10 is provided with a burner air inlet 11 and a burner air outlet 12; flare gas enters the combustor 10 through the combustor inlet 11; the burner air inlet pipeline 20 is connected with the burner air inlet 11; the burner exhaust line 30 is connected at a first end to the burner exhaust port 12; the first end of the first branch pipe 40 is connected with the burner air inlet pipeline 20, and the second end of the first branch pipe 40 is connected with the burner air outlet pipeline 30; the SCR denitration device 60 is provided with an SCR denitration device air inlet and an SCR denitration device air outlet; the air inlet of the SCR denitration device is connected with the second end of the burner exhaust pipeline 30, and the air outlet of the SCR denitration device is connected with the emptying gas pipeline 80; a first pneumatic valve 41 is provided on the first branch line 40 to control the input of flare gas in the first branch line 40; the gas pipe 50 is connected with the first branch pipe 40, and the second pneumatic valve 51 is arranged on the gas pipe 50 for controlling NH 3 And input to the first manifold 40 through the gas line 50. The first end of the second branch pipe 70 is connected with the emptying gas pipeline 80, and the second end of the second branch pipe 70 is connected with the burner 10; a third pneumatic valve 71 is provided on the second branch pipe 70.
An SCR denitration device 60 used in the present disclosure includes: a rectification grill 61, a first stage catalytic layer 64, a second stage catalytic layer 62, and a backup catalytic layer 63; the rectification grating 61, the first-stage catalytic layer 64, the second-stage catalytic layer 62 and the standby catalytic layer 63 are disposed in the SCR denitration device 60, and are sequentially disposed from the SCR denitration device air inlet to the SCR denitration device air outlet. Selective Catalytic Reduction (SCR) with urea aqueous solution as reducing agent can effectively reduce NO in oxygen-enriched and variable reaction environment with variable flow, temperature and components x The current efficiency of emission is as high as 95%. Is extensive in applicationThe denitration catalyst is applied to denitration of automobiles, ships, coal-fired boilers and garbage incinerators. Common SCR catalysts are vanadium-based catalysts and zeolite-type catalysts, and generally employ a 32.5% aqueous urea solution as a reductant, which is injected into the exhaust gas by air-assisted injection. Due to the reaction with NO in the catalyst x The actual reducing agent of the reaction is ammonia (NH) 3 ) Therefore, here, the NH is selected to be directly introduced into the first branch 40 3 As a reducing agent. Two catalyst layers and a spare catalyst layer are provided in the SCR denitration device 60 to ensure sufficient catalysis, and the catalyst is a vanadium-based catalyst. Typically, NO upstream of the rectifier grid 61 x Parameters such as distribution, ammonia injection flow distribution, mixing distance and the like can influence NO on the surface of the first catalyst layer x With NH 3 Is a uniform distribution of the particles.
The combustor exhaust pipeline 30 is further provided with a deflector 31, so that the distribution of the flue gas in the longitudinal direction is more uniform, and in specific implementation, the movement of the flue gas can be guided by changing the size and shape of the deflector 31. The burner 10 is a surface torch closed burner, the combustion of the torch gas is completely completed in a cylindrical combustion chamber, the flame is completely closed, no fire light is visible outside, no light pollution is caused, the heat radiation and heat conduction are reduced, and the combustion noise is reduced. The diameter of the combustion chamber cylinder in the general embodiment is 6000mm and the wall thickness is 8mm.
The pneumatic butterfly valve selected for the first pneumatic valve 41, the second pneumatic valve 51 and the third pneumatic valve 71 in the disclosure has the characteristics of fast action, good reliability, difficult leakage and low cost.
In a first embodiment of the present disclosure, a ground flare closed burner evacuation gas denitration method is provided. Fig. 2 is a schematic flow chart of a method for denitrating exhaust gas of a closed type burner of a ground torch according to a first embodiment of the present disclosure. As shown in fig. 2, includes: the flare gas is introduced into a burner for combustion; the first pneumatic valve is closed, the second pneumatic valve is opened, and NH is introduced through the gas pipe 3 The first branch pipe is converged with the flue gas exhausted by the burner exhaust pipeline to form mixed gas; mixed gas enters SCR denitration equipment to be subjected to denitration, and passes throughThe vent gas line is vented. This embodiment is primarily applicable when hydrocarbons and other emissions are in the flare gas.
In a second embodiment of the present disclosure, a ground flare closed burner evacuation gas denitration method. Fig. 3 is a schematic flow chart of a method for denitrating exhaust gas of a closed type burner of a ground torch according to a second embodiment of the present disclosure. As shown in fig. 3, includes: the flare gas is introduced into the burner for burning, the first pneumatic valve is opened, and the flare gas enters the first branch pipe; the second pneumatic valve is opened, and the flare gas entering the first branch pipe and NH introduced by the gas pipe 3 Converging; then the mixed gas is formed by mixing the first branch pipe with the flue gas exhausted by the burner exhaust pipe; the mixed gas enters SCR denitration equipment to be subjected to denitration, a third pneumatic valve is opened, and the mixed gas flows back to the combustor through a second branch to burn out. In the embodiment, ammonia gas of flare gas is used as a reducing agent, so that denitration is completed, and waste gas is utilized, and the effect of reducing cost is achieved.
Thus, embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. It should be noted that, in the drawings or the text of the specification, implementations not shown or described are all forms known to those of ordinary skill in the art, and not described in detail. Furthermore, the above definitions of the elements and methods are not limited to the specific structures, shapes or modes mentioned in the embodiments, and may be simply modified or replaced by those of ordinary skill in the art.
From the foregoing description, one skilled in the art should have clear insight into the closed-burner exhaust gas denitration system of the ground flare of the present disclosure.
In summary, the present disclosure provides a method of substantially reducing NO x And the cost can be reduced, and the exhaust gas denitration system and method of the ground torch closed type burner for realizing waste gas utilization can be realized.
It should be further noted that, the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only referring to the directions of the drawings, and are not intended to limit the scope of the present disclosure. Like elements are denoted by like or similar reference numerals throughout the drawings. Conventional structures or constructions will be omitted when they may cause confusion in understanding the present disclosure.
And the shapes and dimensions of the various elements in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure. In addition, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Unless otherwise known, numerical parameters in this specification and the appended claims are approximations that may vary depending upon the desired properties sought to be obtained by the present disclosure. In particular, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about". In general, the meaning of expression is meant to include a variation of + -10% in some embodiments, a variation of + -5% in some embodiments, a variation of + -1% in some embodiments, and a variation of + -0.5% in some embodiments by a particular amount.
Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.
The use of ordinal numbers such as "first," "second," "third," etc., in the description and the claims to modify a corresponding element does not by itself connote any ordinal number of elements or the order of manufacturing or use of the ordinal numbers in a particular claim, merely for enabling an element having a particular name to be clearly distinguished from another element having the same name.
Furthermore, unless specifically described or steps must occur in sequence, the order of the above steps is not limited to the list above and may be changed or rearranged according to the desired design. In addition, the above embodiments may be mixed with each other or other embodiments based on design and reliability, i.e. the technical features of the different embodiments may be freely combined to form more embodiments.
Similarly, it should be appreciated that in the above description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.
While the foregoing embodiments have been described in some detail for purposes of clarity of understanding, it will be understood that the foregoing embodiments are merely illustrative of the invention and are not intended to limit the invention, and that any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the present disclosure are intended to be included within the scope of the present disclosure.
Claims (6)
1. The ground torch closed burner is provided with a burner air inlet and a burner air outlet, and torch gas enters the ground torch closed burner through the burner air inlet to complete combustion, flame is completely closed so that the outside cannot see fire light, the burner air inlet is connected with a burner air inlet pipeline, and the burner air outlet is connected with a burner air exhaust pipeline; wherein, ground torch closed combustor evacuation gas denitration system includes:
the first end of the first branch pipe is connected with the burner air inlet pipeline, and the second end of the first branch pipe is connected with the burner air outlet pipeline;
the SCR denitration device is provided with a rectification grating, an air inlet of the SCR denitration device and an air outlet of the SCR denitration device; the air inlet of the SCR denitration device is connected with the second end of the burner exhaust pipeline, the air outlet of the SCR denitration device is connected with the emptying gas pipeline, and the rectification grating is arranged in the SCR denitration device;
the first pneumatic valve is arranged on the first branch pipe and used for controlling the input of flare gas in the first branch pipe to SCR denitration equipment;
the gas transmission pipe is connected with the first branch pipe;
the second pneumatic valve is arranged on the gas pipe and used for controlling the input of NH3 to the first branch pipe through the gas pipe;
the first end of the second branch pipe is connected with the emptying gas pipeline, and the second end of the second branch pipe is connected with the burner;
the third pneumatic valve is arranged on the second branch pipe;
the guide plate is arranged on the exhaust pipeline of the burner.
2. The ground flare closed combustor evacuation gas denitration system of claim 1, the SCR denitration device further comprising: a first stage catalytic layer and a second stage catalytic layer;
the first-stage catalytic layer and the second-stage catalytic layer are arranged in the SCR denitration device, and the rectification grating, the first-stage catalytic layer and the second-stage catalytic layer are sequentially arranged from the air inlet of the SCR denitration device to the air outlet of the SCR denitration device.
3. The ground flare closed combustor evacuation gas denitration system of claim 2, the SCR denitration device further comprising: and the standby catalytic layer is arranged between the second-stage catalytic layer and the exhaust port of the SCR denitration device.
4. The ground flare closed combustor evacuation gas denitration system of claim 1, the first pneumatic valve, the second pneumatic valve, and the third pneumatic valve being pneumatic butterfly valves.
5. A ground flare closed burner exhaust gas denitration method based on the ground flare closed burner exhaust gas denitration system of any one of claims 1 to 4, comprising:
the flare gas is introduced into a burner for combustion;
the first pneumatic valve is closed, the second pneumatic valve is opened, and NH3 introduced through the gas transmission pipe is converged with the flue gas exhausted through the burner exhaust pipeline through the first branch pipe to form mixed gas;
the mixed gas enters SCR denitration equipment to be subjected to denitration, and is emptied through an emptying gas pipeline.
6. A ground flare closed burner exhaust gas denitration method based on the ground flare closed burner exhaust gas denitration system of any one of claims 1 to 4, comprising:
the flare gas is introduced into the burner for burning, the first pneumatic valve is opened, and the flare gas enters the first branch pipe;
the second pneumatic valve is opened, and the flare gas entering the first branch pipe is converged with NH3 introduced by the gas transmission pipe;
then the mixed gas is formed by mixing the first branch pipe with the flue gas exhausted by the burner exhaust pipe;
the mixed gas enters SCR denitration equipment to be subjected to denitration, a third pneumatic valve is opened, and the mixed gas flows back to the combustor through a second branch to burn out.
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| CN201810938076.7A CN109059012B (en) | 2018-08-16 | 2018-08-16 | Ground torch closed combustor exhaust gas denitration system and method |
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| CN201810938076.7A CN109059012B (en) | 2018-08-16 | 2018-08-16 | Ground torch closed combustor exhaust gas denitration system and method |
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| CN109059012B true CN109059012B (en) | 2023-10-10 |
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