WO2023015889A1 - Reductant multi-position layered injection structure for ship denitration - Google Patents

Reductant multi-position layered injection structure for ship denitration Download PDF

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Publication number
WO2023015889A1
WO2023015889A1 PCT/CN2022/081875 CN2022081875W WO2023015889A1 WO 2023015889 A1 WO2023015889 A1 WO 2023015889A1 CN 2022081875 W CN2022081875 W CN 2022081875W WO 2023015889 A1 WO2023015889 A1 WO 2023015889A1
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WIPO (PCT)
Prior art keywords
injection
reductant
injection structure
reducing agent
denitrification
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PCT/CN2022/081875
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French (fr)
Chinese (zh)
Inventor
郭铭玉
刘博群
崔少平
董世培
赵英杰
叶伟
赵俊杰
李士娜
尚浩
李振东
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交通运输部天津水运工程科学研究所
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Publication of WO2023015889A1 publication Critical patent/WO2023015889A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/90—Injecting reactants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/011—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel
    • F01N13/017—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/45—Gas separation or purification devices adapted for specific applications
    • B01D2259/4566—Gas separation or purification devices adapted for specific applications for use in transportation means
    • 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
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9413—Processes characterised by a specific catalyst
    • B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/02—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for marine vessels or naval applications
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the utility model relates to the technical field of ship engine tail gas treatment, in particular to a reducing agent multi-position layered injection structure used for ship engine denitrification.
  • Diesel engine is the main power equipment of ships, and its exhaust gas pollution is relatively serious, especially the nitrogen oxides and sulfides.
  • International Maritime Organization Organization, IMO International Maritime Organization Organization
  • IMO Tier III emission control regulations have been enforced in all sea areas, stipulating that NOx emissions should be reduced by more than 80% compared with Tier I.
  • the current mainstream technology is to use vanadium-based catalysts for selective reduction and catalytic treatment of NOx in exhaust gas, using urea, ammonia water, liquid ammonia, etc. as reducing agents, and using catalytic conversion to achieve NOx emission standards. It is particularly important to design a reaction device that meets the requirements and realizes efficient use of catalysts and reducing agents.
  • the injection structure directly affects the distribution uniformity of the reducing agent, which in turn affects the NOx conversion efficiency. A reasonable design of the injection structure is an important prerequisite for meeting emission standards.
  • the mainstream injection device is to arrange the injection structure before the mixer, with a single-layer distribution, and the nozzle injection direction is arranged in the same direction or opposite to the exhaust gas flow.
  • the above-mentioned structure will have the following disadvantages: 1 The single-layer distribution injection structure cannot be realized Precise injection leads to incomplete contact between the reducing agent and the catalyst, the catalyst cannot be used efficiently, the denitrification effect is not good, and the risk of reducing the escape of the reducing agent is increased; The overall catalytic effect is poor; 3The injection direction is opposite to the exhaust gas flow direction, and the overall denitrification effect is good, but because the exhaust gas contains a large amount of sulfur, after a period of operation, it is easy to form viscous salt with the reducing agent, which will block the nozzle and cause ammonia injection effect become worse and affect the overall catalytic effect.
  • the utility model provides a reducing agent multi-position layered injection structure for ship engine denitrification, which can improve the mixing uniformity of reducing agent and tail gas, reduce the escape amount of reducing agent, and make the The reducing agent and the catalyst contact more comprehensively to improve the denitrification effect.
  • the utility model provides a reducing agent multi-position layered injection structure for ship engine denitrification, which can improve the mixing uniformity of reducing agent and tail gas, reduce the escape amount of reducing agent, and make the The reducing agent and the catalyst contact more comprehensively to improve the denitrification effect.
  • a multi-position layered injection structure of reducing agent used for ship engine denitrification including a two-stage injection structure
  • the first-stage injection structure includes an injection unit , arranged in front of the mixer
  • the secondary injection structure comprises at least one injection unit, arranged in the reactor
  • the injection unit of the secondary injection structure is arranged in front of the catalyst bed
  • the injection units of the primary injection structure have the same structure, and are provided with a reducing agent supply main pipe, and at least three uniformly arranged injection branch pipes are connected to the reducing agent supply main pipe, wherein the outlet flow direction of the middle injection branch pipe is consistent with the exhaust gas flow direction.
  • the discharge direction is opposite, and the injection branch pipes at both ends are respectively sideways 45° to the two sides of the corresponding reducing agent supply main pipe, and nozzles are arranged on the injection branch pipes.
  • a guard plate is arranged in front of the nozzle, and the guard plate is connected with the front end of the injection branch pipe through a bracket.
  • the injection units of the two-stage injection structure are evenly arranged apart from 1 to 2 catalyst beds.
  • the guard plate adopts a tapered structure.
  • the guard plate is 3-5 cm away from the front end of the injection branch pipe.
  • All said reducing agent supply mains extend into the reactor and mixer from different directions.
  • the utility model has the advantages and positive effects: by adopting multi-position, layered, multi-point, and multi-directional countercurrent spraying of the reducing agent, precise injection can be realized, the mixing uniformity of the reducing agent and exhaust gas can be improved, and the escape of the reducing agent can be reduced. amount, so that the reducing agent and the catalyst can contact more comprehensively, thereby improving the denitrification effect.
  • the utility model has the advantages of cost saving, high efficiency and stability, and has good application prospects.
  • Fig. 1 is the structural representation of the utility model
  • Fig. 2 is the structural representation of the first-stage spraying structure and the two-stage spraying structure spraying unit of the utility model;
  • Fig. 3 is a schematic diagram of the injection branch pipe and its connection structure of the present invention.
  • a reducing agent multi-position layered injection structure for denitrification of marine engines including a two-stage injection structure
  • the first-stage injection structure includes an injection unit, which is arranged in front of the mixer 4
  • the second-stage injection structure includes an injection unit.
  • the injection structure comprises at least one injection unit, which is arranged in the reactor 3.
  • the injection unit of the secondary injection structure is arranged in front of the catalyst bed 2, and the injection unit of the secondary injection structure is connected with the injection unit of the primary injection structure.
  • the units have the same structure, and there is a reducing agent supply main pipe 11, and at least three uniformly arranged injection branch pipes 12 are connected to the reducing agent supply main pipe 11, and the outlet direction of the middle injection branch pipe 12 is opposite to the exhaust gas discharge direction.
  • the injection branch pipes 12 at both ends are sprayed countercurrently to both sides of the corresponding reducing agent supply main pipe at 45° sideways, and nozzles 13 are arranged on the injection branch pipes.
  • a guard plate 14 is provided in front of the nozzle 13 , and the guard plate 14 is connected to the front end of the injection branch pipe 12 through a bracket 15 .
  • the setting of the guard plate 14 can effectively reduce the risk of nozzle clogging and achieve better denitrification effect.
  • the injection units of the two-stage injection structure are evenly arranged apart from 1 to 2 catalyst beds.
  • the guard plate 14 adopts a conical structure, which can reduce the flow resistance of the exhaust gas and improve the denitrification efficiency.
  • the guard plate 14 is 3-5 cm away from the front end of the injection branch pipe 12 .
  • All the reductant supply main pipes 11 of the injection structure extend into the reactor 3 and the mixer 4 from different directions, which can further improve the mixing uniformity of the reductant and the exhaust gas, reduce the escape amount of the reductant, and make the reductant and the catalyst More comprehensive contact, thereby improving the denitrification effect.
  • the utility model is not limited to the above-mentioned specific implementation, and the above-mentioned specific implementation is only illustrative and not restrictive. Under the enlightenment of the utility model, those skilled in the art can also make many forms without departing from the purpose of the utility model and the protection scope of the claims, and these all belong to the protection scope of the utility model.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Environmental & Geological Engineering (AREA)
  • Toxicology (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

A reductant multi-position layered injection structure for ship denitration, comprising two stages of injection structures, a first-stage injection structure containing one injection unit that is provided in front of a mixer (4), and a second-stage injection structure containing at least one injection unit that is provided in a reactor (3); the injection units of the second-stage injection structure is provided in front of a catalyst bed layer (2), and the injection units of the second-stage injection structure is the same as the injection unit structure of the first-stage injection structure and are provided with a reductant supply main pipe (11); and at least three uniformly arranged injection branch pipes (12) are connected on the reductant supply main pipe (11), wherein an outflow direction of a middle portion injection branch pipe (12) is opposite to an exhaust direction of exhaust gas, injection branch pipes (12) at two ends are respectively offset by 45° to two sides of the corresponding reductant supply main pipe (11), and the injection branch pipes (12) are provided with a nozzle. The structure can improve the mixing uniformity of a reductant and exhaust gas and reduce the escape amount of the reductant, allowing the reductant to fully make contact with a catalyst, thereby improving the denitration effect.

Description

一种用于船机脱硝的还原剂多位分层喷射结构A reducing agent multi-position layered injection structure for ship engine denitrification 技术领域technical field
本实用新型涉及船机尾气处理技术领域，特别是用于船机脱硝的还原剂多位分层喷射结构。The utility model relates to the technical field of ship engine tail gas treatment, in particular to a reducing agent multi-position layered injection structure used for ship engine denitrification.
背景技术Background technique
柴油机是船舶的主要动力设备，其排放的尾气污染比较严重，特别是其中的氮氧化物以及硫化物。国际海事组织（International Maritime Organization，IMO）的法规对船用柴油机的排放有规范，自2016年1月起，IMO TierⅢ排放控制法规在所有海域内强制执行，规定了NOx的排放要比TierⅠ降低80%以上。目前的主流技术是用钒基催化剂进行选择性还原催化处理尾气中的NOx，以尿素、氨水、液氨等为还原剂，利用催化转化实现NOx达标排放。设计满足要求、实现高效利用催化剂及还原剂的反应装置显得尤为重要，其中喷射结构直接影响还原剂分布均匀性，进而影响NOx转化效率，喷射结构的合理设计是满足排放标准的重要前提。Diesel engine is the main power equipment of ships, and its exhaust gas pollution is relatively serious, especially the nitrogen oxides and sulfides. International Maritime Organization Organization, IMO) regulations regulate the emissions of marine diesel engines. Since January 2016, IMO Tier III emission control regulations have been enforced in all sea areas, stipulating that NOx emissions should be reduced by more than 80% compared with Tier I. The current mainstream technology is to use vanadium-based catalysts for selective reduction and catalytic treatment of NOx in exhaust gas, using urea, ammonia water, liquid ammonia, etc. as reducing agents, and using catalytic conversion to achieve NOx emission standards. It is particularly important to design a reaction device that meets the requirements and realizes efficient use of catalysts and reducing agents. The injection structure directly affects the distribution uniformity of the reducing agent, which in turn affects the NOx conversion efficiency. A reasonable design of the injection structure is an important prerequisite for meeting emission standards.
目前主流的喷射装置是将喷射结构布置在混合器之前，单层分布，喷嘴喷射方向与尾气流动同向或相向布置，采用上述结构会出现如下的一些不足：①单层分布的喷射结构不能实现精准喷射，导致还原剂与催化剂接触不完全，催化剂不能高效利用，脱硝效果不好，同时增加还原剂的逃逸风险；②喷射方向与尾气流方向一致，还原剂与尾气混合不均，也会导致整体催化效果差；③喷射方向与尾气流方向相向，整体脱硝效果好，但因尾气中含有大量的硫，运行一段时间后，容易与还原剂生成黏性的盐，堵塞喷嘴，导致喷氨效果变差，影响整体催化效果。At present, the mainstream injection device is to arrange the injection structure before the mixer, with a single-layer distribution, and the nozzle injection direction is arranged in the same direction or opposite to the exhaust gas flow. The above-mentioned structure will have the following disadvantages: ①The single-layer distribution injection structure cannot be realized Precise injection leads to incomplete contact between the reducing agent and the catalyst, the catalyst cannot be used efficiently, the denitrification effect is not good, and the risk of reducing the escape of the reducing agent is increased; The overall catalytic effect is poor; ③The injection direction is opposite to the exhaust gas flow direction, and the overall denitrification effect is good, but because the exhaust gas contains a large amount of sulfur, after a period of operation, it is easy to form viscous salt with the reducing agent, which will block the nozzle and cause ammonia injection effect become worse and affect the overall catalytic effect.
技术问题technical problem
本实用新型为解决公知技术中存在的技术问题而提供一种用于船机脱硝的还原剂多位分层喷射结构，能够提高还原剂与尾气的混合均匀度，降低还原剂的逃逸量，使还原剂与催化剂更加全面地接触，提高脱硝效果。In order to solve the technical problems existing in the known technology, the utility model provides a reducing agent multi-position layered injection structure for ship engine denitrification, which can improve the mixing uniformity of reducing agent and tail gas, reduce the escape amount of reducing agent, and make the The reducing agent and the catalyst contact more comprehensively to improve the denitrification effect.
技术解决方案technical solution
本实用新型为解决公知技术中存在的技术问题而提供一种用于船机脱硝的还原剂多位分层喷射结构，能够提高还原剂与尾气的混合均匀度，降低还原剂的逃逸量，使还原剂与催化剂更加全面地接触，提高脱硝效果。In order to solve the technical problems existing in the known technology, the utility model provides a reducing agent multi-position layered injection structure for ship engine denitrification, which can improve the mixing uniformity of reducing agent and tail gas, reduce the escape amount of reducing agent, and make the The reducing agent and the catalyst contact more comprehensively to improve the denitrification effect.
本实用新型为解决公知技术中存在的技术问题所采取的技术方案是：一种用于船机脱硝的还原剂多位分层喷射结构，包括两级喷射结构，一级喷射结构包含一个喷射单元，设置在混合器的前面，二级喷射结构包含至少一个喷射单元，设置在反应器内，所述二级喷射结构的喷射单元设置在催化剂床层前，所述二级喷射结构的喷射单元与所述一级喷射结构的喷射单元结构相同，设有一根还原剂供给干管，在所述还原剂供给干管上连接有至少三根均匀设置的喷射支管，其中中部喷射支管的出流方向与尾气的排出方向相反，两端喷射支管分别向相应的还原剂供给干管两侧侧偏45°，在所述喷射支管上设有喷嘴。The technical scheme adopted by the utility model to solve the technical problems existing in the known technology is: a multi-position layered injection structure of reducing agent used for ship engine denitrification, including a two-stage injection structure, and the first-stage injection structure includes an injection unit , arranged in front of the mixer, the secondary injection structure comprises at least one injection unit, arranged in the reactor, the injection unit of the secondary injection structure is arranged in front of the catalyst bed, the injection unit of the secondary injection structure and The injection units of the primary injection structure have the same structure, and are provided with a reducing agent supply main pipe, and at least three uniformly arranged injection branch pipes are connected to the reducing agent supply main pipe, wherein the outlet flow direction of the middle injection branch pipe is consistent with the exhaust gas flow direction. The discharge direction is opposite, and the injection branch pipes at both ends are respectively sideways 45° to the two sides of the corresponding reducing agent supply main pipe, and nozzles are arranged on the injection branch pipes.
在所述喷嘴前方设有护板，所述护板通过支架与所述喷射支管的前端连接。A guard plate is arranged in front of the nozzle, and the guard plate is connected with the front end of the injection branch pipe through a bracket.
所述二级喷射结构的喷射单元相隔1～2个催化剂床层均匀设置。The injection units of the two-stage injection structure are evenly arranged apart from 1 to 2 catalyst beds.
所述护板采用锥形结构。The guard plate adopts a tapered structure.
所述护板距离所述喷射支管前端3-5 cm。The guard plate is 3-5 cm away from the front end of the injection branch pipe.
所有所述还原剂供给干管从不同方向伸入反应器和混合器。All said reducing agent supply mains extend into the reactor and mixer from different directions.
有益效果Beneficial effect
本实用新型具有的优点和积极效果是：通过采用多部位、分层次、多点位、多方向逆流喷射还原剂，能够实现精准喷射，提高还原剂与尾气的混合均匀度，降低还原剂的逃逸量，使还原剂与催化剂更加全面地接触，进而提高脱硝效果。通过采用在喷嘴前设置护板的结构，可以有效降低喷嘴处堵塞的风险，达到更好的脱硝效果，延长***使用寿命。因此，本实用新型具有能够节约成本、高效稳定的优点，具有良好的应用前景。The utility model has the advantages and positive effects: by adopting multi-position, layered, multi-point, and multi-directional countercurrent spraying of the reducing agent, precise injection can be realized, the mixing uniformity of the reducing agent and exhaust gas can be improved, and the escape of the reducing agent can be reduced. amount, so that the reducing agent and the catalyst can contact more comprehensively, thereby improving the denitrification effect. By adopting the structure of setting the protective plate in front of the nozzle, the risk of clogging at the nozzle can be effectively reduced, a better denitrification effect can be achieved, and the service life of the system can be extended. Therefore, the utility model has the advantages of cost saving, high efficiency and stability, and has good application prospects.
附图说明Description of drawings
图1为本实用新型的结构示意图；Fig. 1 is the structural representation of the utility model;
图2为本实用新型的一级喷射结构和二级喷射结构喷射单元的结构示意图；Fig. 2 is the structural representation of the first-stage spraying structure and the two-stage spraying structure spraying unit of the utility model;
图3为本实用新型的喷射支管及其连接结构示意图。Fig. 3 is a schematic diagram of the injection branch pipe and its connection structure of the present invention.
图中：11、还原剂供给干管；12、喷射支管；13、喷嘴；14、护板；15、支架；2、催化剂床层；3、反应器；4、混合器。In the figure: 11. Reductant supply main pipe; 12. Injection branch pipe; 13. Nozzle; 14. Guard plate; 15. Support; 2. Catalyst bed; 3. Reactor; 4. Mixer.
本发明的最佳实施方式BEST MODE FOR CARRYING OUT THE INVENTION
为能进一步了解本实用新型的发明内容、特点及功效，兹例举以下实施例，并配合附图详细说明如下：In order to further understand the invention content, characteristics and effects of the present utility model, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:
请参阅图1～图3，一种用于船机脱硝的还原剂多位分层喷射结构，包括两级喷射结构，一级喷射结构包含一个喷射单元，设置在混合器4的前面，二级喷射结构包含至少一个喷射单元，设置在反应器3内，所述二级喷射结构的喷射单元设置在催化剂床层2前，所述二级喷射结构的喷射单元与所述一级喷射结构的喷射单元结构相同，设有一根还原剂供给干管11，在所述还原剂供给干管11上连接有至少三根均匀设置的喷射支管12，其中中部喷射支管12的出流方向与尾气的排出方向相反，两端喷射支管12分别向相应的还原剂供给干管两侧侧偏45°逆流喷射，在所述喷射支管上设有喷嘴13。通过多部位、分层次、多点位、多方向逆流喷射还原剂，提高还原剂与尾气的混合均匀度，降低还原剂的逃逸量，使还原剂与催化剂更加全面地接触，进而提高脱硝效果。Please refer to Figures 1 to 3, a reducing agent multi-position layered injection structure for denitrification of marine engines, including a two-stage injection structure, the first-stage injection structure includes an injection unit, which is arranged in front of the mixer 4, and the second-stage injection structure includes an injection unit. The injection structure comprises at least one injection unit, which is arranged in the reactor 3. The injection unit of the secondary injection structure is arranged in front of the catalyst bed 2, and the injection unit of the secondary injection structure is connected with the injection unit of the primary injection structure. The units have the same structure, and there is a reducing agent supply main pipe 11, and at least three uniformly arranged injection branch pipes 12 are connected to the reducing agent supply main pipe 11, and the outlet direction of the middle injection branch pipe 12 is opposite to the exhaust gas discharge direction. , the injection branch pipes 12 at both ends are sprayed countercurrently to both sides of the corresponding reducing agent supply main pipe at 45° sideways, and nozzles 13 are arranged on the injection branch pipes. Through multi-position, layered, multi-point, and multi-directional countercurrent injection of reducing agent, the mixing uniformity of reducing agent and exhaust gas can be improved, the escape amount of reducing agent can be reduced, and the reducing agent can be in contact with the catalyst more comprehensively, thereby improving the denitrification effect.
在本实施例中，在所述喷嘴13前方设有护板14，所述护板14通过支架15与所述喷射支管12的前端连接。护板14的设置，可以有效降低喷嘴处堵塞的风险，达到更好的脱硝效果。所述二级喷射结构的喷射单元相隔1～2个催化剂床层均匀设置。所述护板14采用锥形结构，可以减少尾气的出流阻力，提高提高脱硝效率。所述护板14距离所述喷射支管12前端3-5 cm。该喷射结构的所有所述还原剂供给干管11从不同方向伸入反应器3和混合器4，可以进一步提高还原剂与尾气的混合均匀度，降低还原剂的逃逸量，使还原剂与催化剂更加全面地接触，进而提高脱硝效果。In this embodiment, a guard plate 14 is provided in front of the nozzle 13 , and the guard plate 14 is connected to the front end of the injection branch pipe 12 through a bracket 15 . The setting of the guard plate 14 can effectively reduce the risk of nozzle clogging and achieve better denitrification effect. The injection units of the two-stage injection structure are evenly arranged apart from 1 to 2 catalyst beds. The guard plate 14 adopts a conical structure, which can reduce the flow resistance of the exhaust gas and improve the denitrification efficiency. The guard plate 14 is 3-5 cm away from the front end of the injection branch pipe 12 . All the reductant supply main pipes 11 of the injection structure extend into the reactor 3 and the mixer 4 from different directions, which can further improve the mixing uniformity of the reductant and the exhaust gas, reduce the escape amount of the reductant, and make the reductant and the catalyst More comprehensive contact, thereby improving the denitrification effect.
尽管上面结合附图对本实用新型的优选实施例进行了描述，但是本实用新型并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，并不是限制性的，本领域的普通技术人员在本实用新型的启示下，在不脱离本实用新型宗旨和权利要求所保护的范围的情况下，还可以做出很多形式，这些均属于本实用新型的保护范围之内。Although the preferred embodiment of the utility model has been described above in conjunction with the accompanying drawings, the utility model is not limited to the above-mentioned specific implementation, and the above-mentioned specific implementation is only illustrative and not restrictive. Under the enlightenment of the utility model, those skilled in the art can also make many forms without departing from the purpose of the utility model and the protection scope of the claims, and these all belong to the protection scope of the utility model.

Claims (6)

  1. 一种用于船机脱硝的还原剂多位分层喷射结构，其特征在于，包括两级喷射结构，一级喷射结构包含一个喷射单元，设置在混合器的前面，二级喷射结构包含至少一个喷射单元，设置在反应器内，所述二级喷射结构的喷射单元设置在催化剂床层前，所述二级喷射结构的喷射单元与所述一级喷射结构的喷射单元结构相同，设有一根还原剂供给干管，在所述还原剂供给干管上连接有至少三根均匀设置的喷射支管，其中中部喷射支管的出流方向与尾气的排出方向相反，两端喷射支管分别向相应的还原剂供给干管两侧侧偏45°，在所述喷射支管上设有喷嘴。A reductant multi-position layered injection structure for denitrification of marine engines is characterized in that it includes a two-stage injection structure, the primary injection structure includes an injection unit, and is arranged in front of the mixer, and the secondary injection structure includes at least one The spraying unit is arranged in the reactor, the spraying unit of the secondary spraying structure is arranged in front of the catalyst bed, the spraying unit of the secondary spraying structure has the same structure as the spraying unit of the primary spraying structure, and a The reducing agent supply main pipe is connected with at least three uniformly arranged injection branch pipes, wherein the flow direction of the central injection branch pipe is opposite to the discharge direction of the exhaust gas, and the injection branch pipes at both ends respectively flow to the corresponding reducing agent Both sides of the main supply pipe are deflected at 45°, and nozzles are arranged on the spray branch pipe.
  2. 根据权利要求1所述的用于船机脱硝的还原剂多位分层喷射结构，其特征在于，在所述喷嘴前方设有护板，所述护板通过支架与所述喷射支管的前端连接。According to claim 1, the reducing agent multi-position layered injection structure for ship engine denitrification is characterized in that a guard plate is provided in front of the nozzle, and the guard plate is connected to the front end of the injection branch pipe through a bracket .
  3. 根据权利要求1所述的用于船机脱硝的还原剂多位分层喷射结构，其特征在于，所述二级喷射结构的喷射单元相隔1～2个催化剂床层均匀设置。According to claim 1, the reducing agent multi-position layered injection structure for denitrification of marine engines is characterized in that the injection units of the two-stage injection structure are evenly arranged apart from 1 to 2 catalyst beds.
  4. 根据权利要求2所述的用于船机脱硝的还原剂多位分层喷射结构，其特征在于，所述护板采用锥形结构。According to claim 2, the reductant multi-position layered injection structure for marine engine denitrification is characterized in that the guard plate adopts a conical structure.
  5. 根据权利要求4所述的用于船机脱硝的还原剂多位分层喷射结构，其特征在于，所述护板距离所述喷射支管前端3-5 cm。According to claim 4, the reductant multi-position layered injection structure for ship engine denitrification is characterized in that the guard plate is 3-5 cm away from the front end of the injection branch pipe.
  6. 根据权利要求1所述的用于船机脱硝的还原剂多位分层喷射结构，其特征在于，所有所述还原剂供给干管从不同方向伸入反应器和混合器。According to claim 1, the reductant multi-position layered injection structure for marine engine denitrification is characterized in that all the reductant supply main pipes extend into the reactor and the mixer from different directions.
PCT/CN2022/081875 2021-08-13 2022-03-20 Reductant multi-position layered injection structure for ship denitration WO2023015889A1 (en)

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CN215388740U (en) * 2021-08-13 2022-01-04 交通运输部天津水运工程科学研究所 Reducing agent multi-position layered injection structure for denitration of ship engine

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