CN116764424A - SNCR denitration system capable of improving denitration efficiency - Google Patents
SNCR denitration system capable of improving denitration efficiency Download PDFInfo
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- CN116764424A CN116764424A CN202310983702.5A CN202310983702A CN116764424A CN 116764424 A CN116764424 A CN 116764424A CN 202310983702 A CN202310983702 A CN 202310983702A CN 116764424 A CN116764424 A CN 116764424A
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- flue gas
- branch pipe
- gas pipeline
- middle circulation
- spray guns
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Links
- 239000003546 flue gas Substances 0.000 claims abstract description 119
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 118
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 44
- 239000007921 spray Substances 0.000 claims abstract description 44
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims abstract description 42
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 32
- 238000005520 cutting process Methods 0.000 claims abstract description 7
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 13
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 18
- 238000000034 method Methods 0.000 abstract description 10
- 229910021529 ammonia Inorganic materials 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 43
- 239000003570 air Substances 0.000 description 25
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 14
- 235000011114 ammonium hydroxide Nutrition 0.000 description 14
- 239000007788 liquid Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 238000010531 catalytic reduction reaction Methods 0.000 description 4
- 239000004568 cement Substances 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 239000004202 carbamide Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The invention discloses an SNCR denitration system for improving denitration efficiency, which comprises a middle circulation branch pipe, wherein two ends of the middle circulation branch pipe are respectively connected with an upstream flue gas pipeline and a downstream flue gas pipeline, a plurality of outer branch pipes are arranged around the middle circulation branch pipe, one end of each outer branch pipe is connected with the upstream flue gas pipeline, the other end of each outer branch pipe is connected with the downstream flue gas pipeline in a rotary cutting direction, spray guns are respectively arranged on the middle circulation branch pipe and the outer branch pipe, muzzles of the spray guns are respectively introduced into the corresponding branch pipes, and the SNCR denitration system further comprises an amino reducing agent conveying system, and the amino reducing agent conveying system is used for conveying amino reducing agents to the spray guns respectively. The invention improves the denitration efficiency of SNCR and is beneficial to reducing the ammonia escape rate in the denitration process.
Description
Technical Field
The invention relates to the field of SNCR (selective non-catalytic reduction) denitration systems, in particular to an SNCR denitration system capable of improving denitration efficiency.
Background
Nitrogen oxides (NOx) are a major atmospheric pollutant, and emissions to the atmosphere and hydrocarbons can cause photochemical pollution under intense light, and are also a major cause of acid rain. In industrial production, NOx is produced mainly by fuel combustion and N 2 By O in air under high temperature conditions 2 Oxidation occurs.
Flue gas denitration refers to the reduction of generated NOx into N 2 Or the NOx is neutralized into nitrate, so that the NOx in the flue gas is removed. Common denitration processes on the market include selective non-catalytic reduction (SNCR) and Selective Catalytic Reduction (SCR), and combined denitration techniques developed on the basis of the two. The selective non-catalytic reduction (SNCR) technology is that under the condition of no catalyst, an amino reducing agent is sprayed at a proper temperature (850-1100 ℃) to react with NOx in the flue gas to generate harmless N 2 And H is 2 O, thereby removing nitrogen oxides in the flue gas.
With the continuous increase of environmental protection requirements, the emission standard of NOx is also becoming more and more strict. According to the standard DB11/139-2015 of the local standard of Beijing City, the limit value of the emission standard of nitrogen oxides of the newly built boiler from the date of 4.1 of 2017 is 30mg/m 3 Meanwhile, denitration equipment adopting an SNCR process is required, and the ammonia escape mass concentration is not higher than 8mg/m 3 . In 2022, the group standard T/CCAS 022-2022 published by China cement Association (ultra-low emission Standard for atmospheric pollutants for Cement industry) requires a Cement kiln and a kilnThe maximum allowable emission concentration of ultralow emission of nitrogen oxides of the tail waste heat utilization system is 100mg/m 3 Simultaneously, ammonia water, urea and other ammonia-containing substances are required to be used as reducing agents, and the ammonia escape mass concentration in the process of removing nitrogen oxides in the flue gas is not higher than 8mg/m 3 。
In the application of the traditional SNCR denitration technology, a method of spraying an amino reducing agent on a boiler or a flue gas pipeline at one or more points is often adopted. The denitration efficiency of the traditional process method is generally 30% -80% under the limitation of coverage of the sprayed amino reducing agent in the flue gas. After the mass flow of the injected amino reducing agent reaches a certain degree, the injected amino reducing agent is continuously increased, so that the NOx content in the flue gas is not reduced any more, and the mass concentration of ammonia escaping is continuously increased. In order to solve the problems of uniformity of mixing of an amino reducing agent and flue gas and reaction completeness, reduce emission of toxic and harmful atmospheric pollutants which can directly or indirectly influence the quality of ambient air, a denitration system capable of effectively uniformly mixing ammonia nitrogen is urgently needed.
Disclosure of Invention
The invention provides an SNCR denitration system for improving denitration efficiency, which aims to solve the problems of low denitration efficiency and high ammonia escape mass concentration in the existing SNCR denitration technology.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the SNCR denitration system comprises a middle circulation branch pipe, wherein one end of the middle circulation branch pipe is connected with an upstream flue gas pipeline, the other end of the middle circulation branch pipe is connected with a downstream flue gas pipeline, a plurality of outer branch pipes are arranged around the middle circulation branch pipe, one end of each outer branch pipe is connected to the position of the upstream flue gas pipeline corresponding to the lateral direction of the flue gas flow direction, the other end of each outer branch pipe is connected to the downstream flue gas pipeline in the rotary cutting direction, spray guns are respectively arranged on the middle circulation branch pipe and the outer branch pipe, muzzles of the spray guns are respectively introduced into the corresponding branch pipes, amino reducing agents are sprayed into the corresponding branch pipes by the spray guns, and the SNCR denitration system further comprises an amino reducing agent conveying system, wherein the amino reducing agent conveying system is respectively connected with each spray gun and is respectively used for conveying the amino reducing agents to each spray gun.
Further, the middle circulating branch pipe comprises a middle branch pipe, and two ends of the middle branch pipe are correspondingly connected with the upstream flue gas pipeline and the downstream flue gas pipeline through reducing pipes respectively.
Further, the plurality of spray guns are arranged in the middle circulation branch pipe, and muzzles of the plurality of spray guns are respectively communicated into the middle circulation branch pipe from the circumferential direction.
Further, a section of the upstream flue gas pipeline or the downstream flue gas pipeline is set as an expansion joint.
Further, the air delivery system is connected with each spray gun respectively, and compressed air is delivered to each spray gun respectively by the air delivery system.
Further, the device also comprises an ammonia nitrogen concentration detection sensor, and the ammonia nitrogen concentration detection sensor is used for respectively detecting the ammonia nitrogen concentration in the upstream flue gas pipeline and the downstream flue gas pipeline.
The SNCR denitration system comprises a middle circulation branch pipe, wherein one end of the middle circulation branch pipe is connected with an upstream flue gas pipeline, the other end of the middle circulation branch pipe is connected with a downstream flue gas pipeline, a plurality of outer branch pipes are arranged around the middle circulation branch pipe, one end of each outer branch pipe is connected to the position of the upstream flue gas pipeline corresponding to the lateral direction of the flue gas flow direction, the other end of each outer branch pipe is connected to the downstream flue gas pipeline in a rotary cutting direction, a diversion cone is arranged in the middle circulation branch pipe, the interior of the middle circulation branch pipe is divided into two sections which are separated according to the flue gas flow direction by the diversion cone, flue gas flowing through the upstream flue gas pipeline enters the middle circulation branch pipe and is led to each outer branch pipe by the diversion cone, spray guns are respectively arranged at outer branch pipes, openings of the spray guns are respectively led into the outer branch pipes by the spray guns, and the amino reducer conveying system is respectively connected with each spray guns and is respectively conveyed to each spray gun by the amino reducer conveying system.
In the invention, the flue gas flowing from the upstream flue gas pipeline to the downstream flue gas pipeline is divided into a plurality of strands by a pipeline system formed by the middle circulating branch pipes and the outer branch pipes. When no diversion cone is arranged in the middle circulation branch pipe, part of the flue gas directly flows to the downstream flue gas pipeline through the middle circulation branch pipe, the rest of the flue gas respectively flows to the downstream flue gas pipeline through the outer side branch pipe in a spiral way, the spray gun arranged in the middle circulation branch pipe sprays the amino reducing agent from the flue gas in the lateral direction to the inner side, and the spray gun arranged in the outer side branch pipe sprays the amino reducing agent to the flue gas in the inner side according to the spiral direction.
When the guide cone is arranged in the middle flow branch pipe, the flue gas is guided to each outer side branch pipe by the guide cone, and flows into a downstream flue gas pipeline through the bypass of the outer side branch pipe in a screwing way, and the spray gun arranged on the outer side branch pipe sprays the amino reducing agent to the inner flue gas in the screwing way.
By dividing the flue gas into a plurality of strands, spraying the amino reducing agent into each strand of flue gas, under the action of the rotating air flow formed by the plurality of strands of flue gas branch pipes, the amino reducing agent is fully and uniformly dispersed in a downstream flue gas pipeline, and the problems that the denitration efficiency is low due to the fact that the amino reducing agent cannot be uniformly mixed with the flue gas in the central area of the pipeline after being sprayed by the traditional SNCR method and the ammonia escape problem due to the fact that the concentration of the amino reducing agent is too high in the overlapping area of the spraying range of different spray guns and the local amino reducing agent in the side wall area of the pipeline are solved. The invention can fully react the amino reducing agent with NOx in all the flue gas, improves the denitration efficiency of SNCR, and is beneficial to reducing the escape rate of denitration ammonia.
Compared with the prior art, the invention has the beneficial effects that:
(1) The denitration system solves the problems that an amino reducing agent in the traditional SNCR denitration system is not uniformly dispersed and does not completely react with NOx in the flue gas, improves the mixing uniformity and the ammonia nitrogen reaction efficiency of the amino reducing agent and the NOx in the flue gas, thereby improving the flue gas denitration efficiency, reducing the NOx emission, and being beneficial to reducing the denitration ammonia escape rate;
(2) The denitration system is convenient to operate, easy to maintain and low in system operation cost;
(3) The denitration system and the denitration method have wide application fields, including but not limited to flue gas denitration in the fields of industries such as power plants, cement plants, garbage incineration plants, steel plants, coking plants, glass plants, industrial boilers and the like;
(4) The denitration system disclosed by the invention has the advantages of simple structure and low equipment investment, is suitable for being adopted in new projects, and is easy to be technically improved on the existing production device.
Drawings
FIG. 1 is a front elevational view of a structure of an embodiment of the present invention.
FIG. 2 is a top view of an embodiment of the present invention, wherein (a) is a top view of a double outer branch, (b) is a top view of a triple outer branch, and (c) is a top view of a quadruple outer branch.
FIG. 3 is a schematic diagram of the operation of an amino reductant delivery system and air delivery system in accordance with an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a second embodiment of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and examples.
Example 1
As shown in fig. 1, the embodiment discloses an SNCR denitration system for improving denitration efficiency, which comprises a middle circulation branch pipe, wherein the middle circulation branch pipe is composed of a middle branch pipe 3 and reducing pipes 5 connected with pipe orifices at the upper end and the lower end of the middle branch pipe 3, the reducing pipes 5 at the pipe orifices at the upper end of the middle branch pipe 3 gradually increase in diameter from bottom to top, the reducing pipes at the pipe orifices at the lower end of the middle branch pipe 3 gradually increase in diameter from top to bottom, the upper end of the middle branch pipe 3 is connected with an upstream flue gas pipeline 1 through a corresponding reducing pipe 5, the lower end of the middle branch pipe 3 is connected with a downstream flue gas pipeline 2 through a corresponding reducing pipe, one section of the upstream flue gas pipeline or the downstream flue gas pipeline is provided with an expansion joint 7, the pipe orifice at the upper end of the upstream flue gas pipeline 1 is used as an inlet 1-1 of flue gas inlet, and the pipe orifice at the lower end of the downstream flue gas pipeline 2 is used as an outlet 2-1 of flue gas outlet.
As shown in fig. 2, a plurality of outer branch pipes 4 are arranged around the middle circulating branch pipe, the number of the outer branch pipes 4 is greater than or equal to 2, each outer branch pipe 4 is uniformly distributed in the circumferential direction, one end of each outer branch pipe 4 is connected to the position of the upstream flue gas pipeline 1 corresponding to the lateral direction of the flue gas flow direction, and the other end of each outer branch pipe 4 is connected to the downstream flue gas pipeline 2 in the rotary cutting direction. And the connection positions of the outer side branch pipes 4 and the downstream flue gas pipeline 2 are in the same annular direction.
Therefore, the flue gas circulation pipeline is composed of the middle circulation branch pipe, the outer side branch pipe, the upstream flue gas pipeline and the downstream flue gas pipeline.
The middle flow branch pipe is provided with a plurality of spray guns which are arranged outside the middle branch pipe 3 in an equidistant mode, muzzle of each spray gun is led into the middle branch pipe 3 from the circumference of the middle branch pipe 3, and muzzle of each spray gun is respectively vertical to the flow direction of smoke in the middle branch pipe 3, namely vertical direction.
Each of the outer branch pipes 4 is provided with a lance 6, and a muzzle of the lance 6 is opened into the corresponding outer branch pipe 4 in a rotary cutting direction.
In this embodiment, each of the lances 6 has a liquid inlet 6-1 and an air inlet 6-2, wherein the liquid inlet 6-1 is located at an axial end of the lance 6 and the air inlet 6-2 is located at a circumferential side of the lance 6 near the liquid inlet 6-1.
As shown in fig. 3, the embodiment further includes a control module, an ammonia nitrogen concentration detection sensor 8, an amino reducing agent delivery system, and an air delivery system. The ammonia nitrogen concentration detection sensor 8 has two groups, one group is arranged on the upstream flue gas pipeline, the other group is arranged on the downstream flue gas pipeline, the ammonia nitrogen concentration in the upstream flue gas pipeline and the downstream flue gas pipeline is detected by the ammonia nitrogen concentration detection sensor 8, the ammonia nitrogen concentration detection sensor 8 is electrically connected with the control module through signal transmission, and the ammonia nitrogen concentration data detected by the ammonia nitrogen concentration detection sensor 8 is obtained by the control module.
The amino reducing agent conveying system comprises an ammonia water stirring tank 9 and a pump 10, wherein the ammonia water stirring tank 9 is used for preparing the amino reducing agent, an input port of the pump 10 is connected with the ammonia water stirring tank 9 through a pipeline with a valve, an output port of the pump 10 is respectively connected with liquid inlets 6-1 of all spray guns 6 through a pipeline with a valve 11, and the amino reducing agent conveying system is used for conveying the amino reducing agent to all spray guns. The control module is in control electric connection with the pump 10 and the valve 11.
The air delivery system comprises an air compressor 12, the air compressor 12 is respectively connected with the air inlets 6-2 of the spray guns 6 through delivery pipelines 13, and the air delivery system is used for respectively delivering high-pressure compressed air to the spray guns. The control module is in control electrical connection with the air compressor 12.
In this embodiment, the flue gas enters the upstream flue gas pipeline 1, then part of the flue gas enters the middle circulation branch pipe, the rest of the flue gas enters each outer side branch pipe 4 respectively, and the flue gas of the middle circulation branch pipe and each outer side branch pipe 4 finally enters the downstream flue gas pipeline 2.
When the embodiment works, ammonia water or urea particles and water are metered according to the ratio requirement and then are sent into an ammonia water stirring tank 9, stirring is carried out for 20-60 min at normal temperature and normal pressure, and ammonia water/urea solution with proper concentration is prepared and is sent to a liquid inlet 6-1 of a spray gun 6 through a pump 10. The outlet pressure of the control pump 10 is within the range of 1-6 MPa, ammonia nitrogen concentration in the upstream and downstream flue gas pipelines is automatically detected by the ammonia nitrogen concentration detection sensor 8, signals are transmitted to the control module, and after automatic calculation in the control module, the mass flow of ammonia water is controlled by adjusting the valve 11 on the outlet pipeline of the pump 10.
High-temperature flue gas with the temperature range of 850-1100 ℃ enters the system from an inlet 1-1 of an upstream flue gas pipeline 1, is divided into a plurality of air flows by a middle circulating branch pipe 5 and an outer branch pipe 4, atomized ammonia water is sprayed into each air flow branch pipe through a spray gun 6, high-pressure air is provided by an air compressor 12 and is sent to an air inlet 6-2 of the spray gun 6 through a conveying pipeline 13, and the pressure of compressed air is controlled within the range of 0.1-1 MPa, so that good atomization effect is ensured.
Spraying atomized ammonia water into the flue gas, uniformly mixing the atomized ammonia water with the middle flue gas along with a plurality of cyclone flue gases, and flowing out from the outlet 2-1 of the downstream flue gas pipeline 2 to fully homogenize the ammonia water and the flue gas and reduce NOx in the flue gas into N 2 The concentration of NOx in the flue gas is reduced.
Example two
The embodiment discloses SNCR denitration system capable of improving denitration efficiency, which comprises a middle circulating branch pipe, an upstream flue gas pipeline, a downstream flue gas pipeline and a plurality of outer side branch pipes, wherein the middle circulating branch pipe, the upstream flue gas pipeline, the downstream flue gas pipeline and the outer side branch pipes are identical in structure with the embodiment, and a flue gas circulating pipeline is formed by an ammonia nitrogen concentration detection sensor 8, an amino reducing agent conveying system and an air conveying system in the same mode as the embodiment. The embodiment also comprises a control module, an ammonia nitrogen concentration detection sensor 8, an amino reducing agent conveying system and an air conveying system which are the same as those in the first embodiment, and the control module, the ammonia nitrogen concentration detection sensor 8, the amino reducing agent conveying system and the air conveying system have the same functions as those in the first embodiment.
The difference between this embodiment and the first embodiment is that the upper pipe orifice of the middle branch pipe 3 is provided with a flow guiding cone 14, and the bottom of the flow guiding cone 14 is connected with the bottom surface of the intersection of the outer branch pipe 4 and the upstream flue gas pipeline 1, so that the whole middle flow branch pipe is divided into two sections separated in the flue gas flowing direction (i.e. the vertical direction) by the flow guiding cone 14. In operation of this embodiment, the intermediate branch 3 is made as a blind pipe with a flow guide cone, and no flue gas passes through the intermediate branch 3. The high-temperature flue gas is completely guided into each outer side branch pipe 4 after passing through the guide cone 14, and the atomized ammonia water is mixed with all the high-temperature flue gas through a plurality of rotational flows, so that the mixing uniformity degree of the atomized ammonia water and the high-temperature flue gas can be further improved.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, and the examples described herein are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the spirit and scope of the present invention. The individual technical features described in the above-described embodiments may be combined in any suitable manner without contradiction, and such combination should also be regarded as the disclosure of the present disclosure as long as it does not deviate from the idea of the present invention. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.
The present invention is not limited to the specific details of the above embodiments, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the protection scope of the present invention without departing from the scope of the technical concept of the present invention, and the technical content of the present invention is fully described in the claims.
Claims (7)
1. The SNCR denitration system is characterized by comprising a middle circulation branch pipe, wherein one end of the middle circulation branch pipe is connected with an upstream flue gas pipeline, the other end of the middle circulation branch pipe is connected with a downstream flue gas pipeline, a plurality of outer branch pipes are arranged around the middle circulation branch pipe, one end of each outer branch pipe is connected to the position of the upstream flue gas pipeline corresponding to the lateral direction of the flue gas flow direction, the other end of each outer branch pipe is connected to the downstream flue gas pipeline in the rotary cutting direction, the middle circulation branch pipe and the outer branch pipe are respectively provided with a spray gun, muzzles of the spray guns are respectively introduced into the corresponding branch pipes, amino reducing agents are sprayed into the corresponding branch pipes by the spray guns, and the SNCR denitration system further comprises an amino reducing agent conveying system, wherein the amino reducing agents are respectively connected with the spray guns, and the amino reducing agents are respectively conveyed to the spray guns by the amino reducing agent conveying system.
2. The SNCR denitration system according to claim 1, wherein the intermediate flow branch pipe comprises an intermediate branch pipe, and two ends of the intermediate branch pipe are respectively connected with the upstream flue gas pipeline and the downstream flue gas pipeline through reducer pipes.
3. An SNCR denitration system according to claim 1 wherein the intermediate flow manifold is provided with a plurality of lances, the muzzle of each of the plurality of lances being circumferentially directed into the intermediate flow manifold.
4. An SNCR denitration system according to claim 1, wherein a section of the upstream flue gas duct or the downstream flue gas duct is provided as an expansion joint.
5. An SNCR denitration system according to claim 1 further comprising an air delivery system, the air delivery system being connected to each lance and delivering compressed air to each lance.
6. The SNCR denitration system for improving denitration efficiency according to claim 1, further comprising ammonia nitrogen concentration detection sensors, wherein the ammonia nitrogen concentration detection sensors detect ammonia nitrogen concentrations in the upstream flue gas duct and the downstream flue gas duct, respectively.
7. The SNCR denitration system is characterized by comprising a middle circulation branch pipe, wherein one end of the middle circulation branch pipe is connected with an upstream flue gas pipeline, the other end of the middle circulation branch pipe is connected with a downstream flue gas pipeline, a plurality of outer branch pipes are arranged around the middle circulation branch pipe, one end of each outer branch pipe is connected to the position of the upstream flue gas pipeline corresponding to the lateral direction of the flue gas flow direction, the other end of each outer branch pipe is connected to the downstream flue gas pipeline in a rotary cutting direction, a flow guide cone is arranged in the middle circulation branch pipe, the interior of the middle circulation branch pipe is divided into two sections which are separated according to the flue gas flow direction by the flow guide cone, flue gas flowing through the upstream flue gas pipeline enters the middle circulation branch pipe and is guided to each outer branch pipe by the flow guide cone, spray guns are respectively arranged on the outer branch pipes, muzzles of the spray guns are respectively introduced into the outer branch pipes by the spray guns, and the amino reducing agent conveying system is respectively connected with each spray gun and is respectively conveyed to each spray gun by the amino reducing agent conveying system.
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| CN202310983702.5A CN116764424B (en) | 2023-08-07 | 2023-08-07 | SNCR denitration system capable of improving denitration efficiency |
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| CN202310983702.5A CN116764424B (en) | 2023-08-07 | 2023-08-07 | SNCR denitration system capable of improving denitration efficiency |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130213231A1 (en) * | 2010-07-25 | 2013-08-22 | Clean Marine As | Flue gas scrubbing apparatus and methods thereof |
| CN105289302A (en) * | 2015-11-11 | 2016-02-03 | 华南理工大学 | Rotary-cut SCR denitration method and apparatus thereof |
| CN217392027U (en) * | 2022-04-29 | 2022-09-09 | 天津晓沃环保工程股份公司 | Flue gas denitration ozone distribution device |
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- 2023-08-07 CN CN202310983702.5A patent/CN116764424B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130213231A1 (en) * | 2010-07-25 | 2013-08-22 | Clean Marine As | Flue gas scrubbing apparatus and methods thereof |
| CN105289302A (en) * | 2015-11-11 | 2016-02-03 | 华南理工大学 | Rotary-cut SCR denitration method and apparatus thereof |
| CN217392027U (en) * | 2022-04-29 | 2022-09-09 | 天津晓沃环保工程股份公司 | Flue gas denitration ozone distribution device |
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