CN109046023B - SCR reactor soot blowing system and method - Google Patents
SCR reactor soot blowing system and method Download PDFInfo
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- CN109046023B CN109046023B CN201810764374.9A CN201810764374A CN109046023B CN 109046023 B CN109046023 B CN 109046023B CN 201810764374 A CN201810764374 A CN 201810764374A CN 109046023 B CN109046023 B CN 109046023B
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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
- B01D53/92—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
Abstract
The invention provides a soot blowing system of an SCR reactor and a soot blowing method realized by the same, belonging to the technical field of after-treatment of tail gas of marine diesel engines. The soot blowing system of the invention takes compressed air as blowing gas and comprises an air bottle, a decompression module, a control module, a rotary pressure pulse converter, a rotary power device and a soot blowing pipeline. When the flue gas pressure at the inlet and the outlet of the SCR reactor exceeds a set value, the controller of the soot blowing system automatically starts soot blowing, compressed air in the air bottle is conveyed to the upper part of the rotary pressure pulse converter through the pressure reducer, the rotary pressure pulse converter can enable the soot blowing pipeline to generate blowing air with different pressures along with time through rotation, strong turbulence disturbance is formed on the surface of the catalyst, and the blowing effect is improved. The soot blowing pipeline is reasonable in arrangement, secondary soot deposition can be effectively avoided, meanwhile, the soot blowing hole is located on the soot blowing pipeline, the structure of the soot blowing hole is simple, and later maintenance is facilitated.
Description
Technical Field
The invention belongs to the technical field of marine diesel engine tail gas aftertreatment, and particularly relates to a soot blowing system of an SCR (selective catalytic reduction) reactor and a soot blowing method realized by the same.
Background
The SCR technology is a ship denitration technology which is widely applied at present. The marine diesel engine burns inferior fuel oil, and exhaust gas of the diesel engine contains a large amount of dust. In addition, the flue gas entering the SCR reactor contains a small amount of urea crystals, sulfate and other components, and ash is deposited on the surface of the catalyst of the SCR reactor, so that the effective catalytic area of the catalyst can be reduced, and the denitration performance of an SCR system is greatly influenced. Many researchers at home and abroad research soot blowing devices of the SCR system, but the soot blowing system of the SCR reactor still has problems, which causes the performance of the SCR reactor to be reduced.
The patent application number is 201310409471.3 proposes to use among the "soot blower that is used for SCR denitration reactor" and spouts the pipe network unit module of air injection to carry out the deposition to SCR system and sweep, and the fumarole is more on the jet-propelled soot blowing branch pipe of the pipe network unit module of air injection among this set of soot blower, needs a large amount of compressed air to guarantee the operation of system, causes the air compressor machine to frequently open and stop, consumes a large amount of energy. In addition, the number of soot blowing branch pipes distributed between the flue gas inlet and the catalyst is large, so that the pressure of the flue gas is reduced, and meanwhile, due to the long-term operation of the system, the soot on the surfaces of the gas injection soot blowing branch pipes are bridged with each other to form a new soot deposition area, so that the normal operation of the SCR reactor is influenced.
In the "soot blowing system for SCR reactor" of patent application No. 201611230660.4, a soot blowing device is proposed in which soot blowing pipes of different catalyst layers are connected to the same air bottle. In the invention, more air bottles are distributed, so that the space occupancy rate of the soot blowing system in the SCR reactor is greatly increased. In addition, the system relates to more electromagnetic valves, so that the reliability of the SCR reactor is reduced to a great extent, and the operation and maintenance difficulty of the SCR reactor is increased.
In summary, the existing SCR reactor has the problems of large gas consumption, low purging efficiency, complex purging pipeline, easy formation of a new soot deposition area, and the like, and it is necessary to develop and design a set of SCR reactor soot blowing system which is economical, efficient, and simple to operate and maintain.
Disclosure of Invention
The invention aims to provide an SCR reactor soot blowing system which is simple in structure, convenient to operate, good in working performance and high in efficiency and a soot blowing method realized by the system.
The purpose of the invention is realized as follows:
the invention provides a soot blowing system of an SCR (selective catalytic reduction) reactor, which comprises an air bottle 1, a decompression module, a control module 4, a rotary pressure pulse converter 5, a rotating motor 6, a flue gas inlet pressure sensor 7, a flue gas outlet pressure sensor 8 and a soot blowing pipeline 9, wherein the decompression module comprises a compressed air electromagnetic valve 2 and a compressed air decompression valve 3;
the soot blowing pipeline 9 is positioned in the SCR reactor, and a flue gas inlet pressure sensor 7 and a flue gas outlet pressure sensor 8 are respectively arranged at two ends of the soot blowing pipeline; the rotary pressure pulse converter 5 is arranged above the soot blowing pipeline 9, and the rotary motor 6 is connected with the rotary pressure pulse converter 5; compressed air is stored in the air bottle 1, and the air bottle 1 is connected with a rotary pressure pulse converter 5 through a decompression module.
For an SCR reactor soot blowing system, a rotary pressure pulse converter 5 comprises a flange 5-1, a rotary pulse generator 5-2 and a gas discharge groove 5-3, wherein the rotary pulse generator 5-2 comprises 3 groups of air pipelines, each group of air pipelines comprises a pressure reducing valve 5-4, a compressed air inlet pipeline 5-5 and a compressed air outlet pipeline 5-6, the compressed air inlet pipeline 5-5 and the compressed air outlet pipeline 5-6 are connected through the pressure reducing valve 5-4, the upper part of the compressed air inlet pipeline 5-5 and the lower part of the compressed air outlet pipeline 5-6 are respectively fixed through the flange 5-1, and the flange 5-1 is uniformly provided with the gas discharge groove 5-3.
Preferably, 3 groups of air pipelines in the rotary pulse generator 5-2 form an included angle of 120 degrees with each other, and the pressure reducing values of the pressure reducing valves 5-4 arranged in each group are different.
Preferably, the soot blowing pipeline 9 is provided with two soot blowing spray holes 9-1 on the pipeline wall intersecting the plane at equal intervals, the included angle between the two soot blowing spray holes 9-1 is 40 degrees to 60 degrees, such as 40 degrees, 45 degrees, 50 degrees, 55 degrees and 60 degrees; the diameter of the soot blowing spray hole 9-1 is not more than 2 mm.
For an SCR reactor soot blowing system, the soot blowing system comprises M groups of rotary pressure pulse converters 5, the SCR reactor comprises M groups of soot blowing pipelines 9, wherein the size of M is determined according to the width of the SCR reactor; the soot blowing pipeline 9 is divided into N transverse planes at equal intervals, wherein the size of N is determined according to the size of the cross section area of the SCR reactor.
The invention also provides a soot blowing method of the SCR reactor, which is realized by the following steps:
(1) initializing a system, wherein a control module starts a flue gas inlet pressure sensor and a flue gas outlet pressure sensor, and acquires the pressure difference between an inlet and an outlet of the SCR reactor;
(2) the control module compares the collected pressure difference with a preset pressure difference, and if the collected pressure difference exceeds the preset pressure difference, the control module starts a soot blowing mode;
(3) the compressed air electromagnetic valve is opened, the compressed air stored in the air bottle passes through the compressed air electromagnetic valve, the compressed air is decompressed to a rated pressure in the decompressor, and the decompressed compressed air is transmitted to the rotary pressure pulse converter;
(4) compressed air enters from the top end of the rotary pressure pulse converter, enters the rotary pulse generator through a fixed flange at the top end, and is decompressed into different blowing pressures by different pipelines under the action of different pressure reducers;
(5) compressed air discharged from the rotary pressure pulse converter enters a soot blowing pipeline in the SCR reactor, the compressed air is discharged from a soot blowing hole in the soot blowing pipeline, and soot on the surface of the SCR catalyst is swept by the compressed air with variable pressure.
For the soot blowing method of the SCR reactor, in the step (4), under the control of the control module, the pulse converter rotates 120 degrees along a constant direction at certain intervals, air pipelines are circularly converted, and compressed air with different blowing pressures is generated by each air pipeline in front of the soot blowing pipeline at different times, so that the pressure regular change of three air pipelines at the outlet of the rotary pressure pulse converter is realized.
The invention has the beneficial effects that:
the soot blowing pipelines of the soot blowing system are simply and longitudinally arranged in the reactor, and are thin, so that the pressure drop of the flue gas in the SCR reactor can be effectively reduced.
An included angle of about 50 degrees is formed between two soot blowing spray holes at the same height on the soot blowing pipeline, so that a better purging effect can be ensured on the premise of less air consumption.
The number of soot blowing pipelines in front of each layer of catalyst is small, and the formation of bridging of soot on the soot blowing pipelines can be effectively avoided, so that secondary soot deposition is avoided.
The rotary pressure pulse converter can realize the regular change of the soot blowing pressure of the soot blowing pipeline distributed on each layer, so that compressed air forms stronger air turbulence disturbance at the front end of the SCR catalyst, and the purging effect is improved.
The soot blowing spray holes in the soot blowing pipeline are simple holes in the pipeline, the structure is simple, faults are not easy to occur, and the difficulty of system operation and maintenance can be effectively reduced.
The control system of the soot blowing system can automatically control the start and stop of the soot blowing system by identifying the pressure difference of flue gas at the inlet and the outlet of the SCR reactor.
Drawings
FIG. 1 is a schematic structural diagram of an SCR reactor soot blowing system according to the present invention;
FIG. 2 is a schematic view of a rotary pressure pulse converter according to the present invention;
FIG. 3 is a schematic view of the structure of a soot blowing pipeline in the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
With reference to fig. 1 to 3, the invention provides a soot blowing system of an SCR reactor, which mainly comprises an air bottle, a pressure reduction system, a control system, a rotary pressure pulse converter and a power device. The soot blowing pipeline of the soot blowing system of the SCR reactor provided by the invention is a stainless steel pipeline with regularly arranged soot blowing holes, and the soot on the surface of the SCR reactor catalyst is blown by using compressed air with variable pressure generated by a rotary pressure pulse converter.
When the pressure difference between the inlet and the outlet of the SCR reactor is large, the control system 4 of the soot blowing system automatically starts the soot blowing mode. The compressed air solenoid valve 2 is opened, and the compressed air in the air bottle 1 passes through the compressed air solenoid valve and the pressure reducer 3 to reduce the pressure to about 15 bar.
The decompressed compressed air is respectively sent to a first rotary pressure pulse converter 5, a second rotary pressure pulse converter 5 and a third rotary pressure pulse converter 5, each rotary pressure pulse converter is respectively provided with three air inlet compressed air pipelines and three air outlet compressed air pipelines which form an included angle of 120 degrees, the three air outlet pipelines are uniformly distributed in front of a catalyst, the core component of the rotary pressure pulse converter is a rotary pulse generator 5-2 in the figure 2, the three pipelines of the rotary pulse generator are respectively provided with pressure reducing valves 5-4 with different decompression values, a rotary motor 6 drives the rotary pulse generator to rotate according to a certain rule under the action of a control system, so that the pressure values of the three pipelines at the outlet of the rotary pressure pulse converter change along with time, the pressure values of the three compressed air pipelines in front of the catalyst are ensured to be in a changing state, and stronger turbulence intensity is formed, the turbulent kinetic energy is reasonably utilized, and the working performance of the soot blower is ensured.
With reference to fig. 2, the flange at the upper part of the rotary pulse generator is provided with a gas release groove 4, so that the rotary pressure pulse converter is ensured not to have a fault caused by gas blockage in the rotating process.
Air discharged from the rotary pressure pulse converter enters a soot blowing pipeline, and compressed air is sprayed out through small holes with the diameter of about 1.5mm formed in the soot blowing pipeline, so that the blowing of the soot on the surface of the catalyst is completed.
Four rows of soot blowing spray holes on the soot blowing pipeline are arranged in the vertical direction to serve as an indication, the specific arrangement row number is designed according to the actual size of the SCR reactor, three air pipelines of the rotary pressure pulse converter are arranged to serve as an indication, and the air pipelines are reasonably arranged according to the width of the SCR reactor in practice.
The invention also provides a soot blowing method based on the soot blowing system of the SCR reactor, which comprises the following specific implementation steps:
(1) pressure sensors are arranged at a flue gas inlet and a flue gas outlet of the SCR reactor, and when the pressure difference exceeds a certain value, the control system can automatically start the SCR soot blower.
(2) The compressed air stored in the air tank is decompressed to a rated pressure in a decompressor by a compressed air solenoid valve, and the decompressed compressed air is delivered to a rotary pressure pulse converter.
(3) Compressed air enters from the top end of the rotary pressure pulse converter, passes through the fixing flange at the top end and then enters the rotary pulse generator, and different pipelines are decompressed into different purging pressures under the action of different pressure reducers.
(4) And under the control of a control system, the pulse converter rotates 120 degrees in a certain direction at certain intervals, so that the pressure regular change of three air pipelines at the outlet of the rotary pressure pulse converter is realized.
(5) Compressed air discharged from the rotary pressure pulse converter enters a soot blowing pipeline in the SCR reactor, and the compressed air is discharged from a soot blowing hole in the soot blowing pipeline, so that the blowing of the surface soot of the catalyst is realized.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The utility model provides a SCR reactor soot blowing system which characterized in that: the device comprises an air bottle (1), a pressure reducing module, a control module (4), a rotary pressure pulse converter (5), a rotating motor (6), a flue gas inlet pressure sensor (7), a flue gas outlet pressure sensor (8) and a soot blowing pipeline (9), wherein the pressure reducing module comprises a compressed air electromagnetic valve (2) and a compressed air pressure reducing valve (3);
the soot blowing pipeline (9) is positioned in the SCR reactor, and a flue gas inlet pressure sensor (7) and a flue gas outlet pressure sensor (8) are respectively arranged at two ends of the soot blowing pipeline; the rotary pressure pulse converter (5) is arranged above the soot blowing pipeline (9), and the rotary motor (6) is connected with the rotary pressure pulse converter (5); compressed air is stored in the air bottle (1), and the air bottle (1) is connected with the rotary pressure pulse converter (5) through the decompression module;
the rotary pressure pulse converter (5) comprises a flange (5-1), a rotary pulse generator (5-2) and an air leakage groove (5-3), wherein the rotary pulse generator (5-2) comprises 3 groups of air pipelines, each group of air pipeline comprises a pressure reducing valve (5-4), a compressed air inlet pipeline (5-5) and a compressed air outlet pipeline (5-6), the compressed air inlet pipeline (5-5) and the compressed air outlet pipeline (5-6) are connected through the pressure reducing valves (5-4), the upper part of the compressed air inlet pipeline (5-5) and the lower part of the compressed air outlet pipeline (5-6) are respectively fixed through the flange (5-1), and the air leakage groove (5-3) is uniformly formed in the flange (5-1);
3 groups of air pipelines in the rotary pulse generator (5-2) form an included angle of 120 degrees with each other, and pressure reducing values of pressure reducing valves (5-4) arranged in each group are different;
soot blowing spray holes (9-1) are formed in the soot blowing pipeline (9) on the pipeline wall which cuts the plane at equal intervals, two soot blowing spray holes (9-1) are formed in each plane, and the included angle between the two soot blowing spray holes (9-1) is 40-60 degrees; the diameter of the soot blowing spray hole (9-1) is not more than 2 mm;
the soot blowing system comprises M groups of rotary pressure pulse converters (5), the SCR reactor comprises M groups of soot blowing pipelines (9), and the size of M is determined according to the width of the SCR reactor; the soot blowing pipeline (9) is divided into N transverse planes at equal intervals, wherein the size of N is determined according to the size of the cross section area of the SCR reactor.
2. A soot blowing method of an SCR (selective catalytic reduction) reactor is characterized in that a soot blowing system of the SCR reactor comprises an air bottle (1), a pressure reduction module, a control module (4), a rotary pressure pulse converter (5), a rotary motor (6), a flue gas inlet pressure sensor (7), a flue gas outlet pressure sensor (8) and a soot blowing pipeline (9), wherein the pressure reduction module comprises a compressed air electromagnetic valve (2) and a compressed air pressure reducing valve (3); the soot blowing pipeline (9) is positioned in the SCR reactor, and a flue gas inlet pressure sensor (7) and a flue gas outlet pressure sensor (8) are respectively arranged at two ends of the soot blowing pipeline; the rotary pressure pulse converter (5) is arranged above the soot blowing pipeline (9), and the rotary motor (6) is connected with the rotary pressure pulse converter (5); compressed air is stored in the air bottle (1), and the air bottle (1) is connected with the rotary pressure pulse converter (5) through the decompression module; the rotary pressure pulse converter (5) comprises a flange (5-1), a rotary pulse generator (5-2) and an air leakage groove (5-3), wherein the rotary pulse generator (5-2) comprises 3 groups of air pipelines, each group of air pipeline comprises a pressure reducing valve (5-4), a compressed air inlet pipeline (5-5) and a compressed air outlet pipeline (5-6), the compressed air inlet pipeline (5-5) and the compressed air outlet pipeline (5-6) are connected through the pressure reducing valves (5-4), the upper part of the compressed air inlet pipeline (5-5) and the lower part of the compressed air outlet pipeline (5-6) are respectively fixed through the flange (5-1), and the air leakage groove (5-3) is uniformly formed in the flange (5-1); 3 groups of air pipelines in the rotary pulse generator (5-2) form an included angle of 120 degrees with each other, and pressure reducing values of pressure reducing valves (5-4) arranged in each group are different; soot blowing spray holes (9-1) are formed in the soot blowing pipeline (9) on the pipeline wall which cuts the plane at equal intervals, two soot blowing spray holes (9-1) are formed in each plane, and the included angle between the two soot blowing spray holes (9-1) is 40-60 degrees; the diameter of the soot blowing spray hole (9-1) is not more than 2 mm; the soot blowing system comprises M groups of rotary pressure pulse converters (5), the SCR reactor comprises M groups of soot blowing pipelines (9), and the size of M is determined according to the width of the SCR reactor; the soot blowing pipeline (9) is divided into N transverse cutting planes at equal intervals, wherein the size of N is determined according to the size of the cross section of the SCR reactor; the method is characterized by comprising the following steps:
(1) initializing a system, wherein a control module starts a flue gas inlet pressure sensor and a flue gas outlet pressure sensor, and acquires the pressure difference between an inlet and an outlet of the SCR reactor;
(2) the control module compares the collected pressure difference with a preset pressure difference, and if the collected pressure difference exceeds the preset pressure difference, the control module starts a soot blowing mode;
(3) the compressed air electromagnetic valve is opened, the compressed air stored in the air bottle passes through the compressed air electromagnetic valve, the compressed air is decompressed to a rated pressure in the decompressor, and the decompressed compressed air is transmitted to the rotary pressure pulse converter;
(4) compressed air enters from the top end of the rotary pressure pulse converter, enters the rotary pulse generator through a fixed flange at the top end, and is decompressed into different blowing pressures by different pipelines under the action of different pressure reducers;
(5) compressed air discharged from the rotary pressure pulse converter enters a soot blowing pipeline in the SCR reactor, the compressed air is discharged from a soot blowing hole in the soot blowing pipeline, and soot on the surface of the SCR catalyst is swept by the compressed air with variable pressure; in the step (4), under the control of the control module, the pulse converter rotates 120 degrees along a constant direction at certain intervals, air pipelines are circularly converted, and compressed air with different blowing pressures is generated in each air pipeline in front of the soot blowing pipeline at different time, so that the pressure regular change of three air pipelines at the outlet of the rotary pressure pulse converter is realized.
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109459967A (en) * | 2018-12-27 | 2019-03-12 | 凯龙高科技股份有限公司 | A kind of SCR safe control system peculiar to vessel |
| CN109989806B (en) * | 2019-03-04 | 2021-02-05 | 中国船舶重工集团公司第七一一研究所 | Diesel engine high-pressure SCR (selective catalytic reduction) ventilation and pressure stabilization system |
| CN112746889B (en) * | 2019-10-29 | 2022-11-18 | 中船海洋动力部件有限公司 | Assembling method for vertical SCR (selective catalytic reduction) reactor of marine diesel engine |
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