CN115138204A - SCR denitration flue gas pretreatment device and system thereof - Google Patents
SCR denitration flue gas pretreatment device and system thereof Download PDFInfo
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- CN115138204A CN115138204A CN202210731998.7A CN202210731998A CN115138204A CN 115138204 A CN115138204 A CN 115138204A CN 202210731998 A CN202210731998 A CN 202210731998A CN 115138204 A CN115138204 A CN 115138204A
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- flue gas
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 239000003546 flue gas Substances 0.000 title claims abstract description 102
- 239000000919 ceramic Substances 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 14
- 239000000779 smoke Substances 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- 238000007781 pre-processing Methods 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 abstract description 31
- 238000005299 abrasion Methods 0.000 abstract description 12
- 239000000428 dust Substances 0.000 abstract description 9
- 239000003638 chemical reducing agent Substances 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 16
- 239000002893 slag Substances 0.000 description 12
- 229910021529 ammonia Inorganic materials 0.000 description 9
- 230000000903 blocking effect Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000009434 installation Methods 0.000 description 4
- 239000011362 coarse particle Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
- B01D45/06—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by reversal of direction of flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention provides an SCR denitration flue gas pretreatment device and a system thereof, which comprise a baffle plate arranged in a flue at the tail part of a boiler, wherein the baffle plate in the flue is provided with a plurality of blocks to form a baffling area, the baffle plate comprises at least three planes or curved surfaces, and a wear-resistant ceramic plate is arranged on the windward surface of the baffle plate. The scheme adopts simple facilities and structures to effectively reduce, intercept and remove large particles in the flue gas, effectively reduces or eliminates the blockage and abrasion of the denitration catalyst, and prolongs the service life of the catalyst; the windward side of the baffle plate is lined with a wear-resistant ceramic plate, so that the abrasion of smoke dust to the baffle plate can be effectively prevented, and the service life of the baffle plate is ensured to be longer than the time limit requirement of boiler overhaul; meanwhile, when the flue gas passes through the baffling area, local mixed flow and turbulence are generated, the mixing among flue gas molecules is increased, the flue gas components are more uniform, the denitration reaction after the denitration reducing agent is uniformly sprayed is more complete and rapid, and the denitration efficiency is higher.
Description
Technical Field
The invention relates to the field of thermal power generation and various coal-fired furnace and kiln flue gas treatment and environment-friendly processes, in particular to an SCR denitration flue gas pretreatment device and an SCR denitration flue gas pretreatment system.
Background
After the coal is combusted, pollutants such as smoke dust, sulfur dioxide, nitrogen oxides and the like can be generated and are discharged along with combustion flue gas. Therefore, the flue gas dust removal, desulfurization and denitration are necessary pollution treatment facilities for all coal-fired power generation boilers and various industrial furnaces and kilns. The most effective and widely used process for flue gas denitration is the Selective Catalytic Reduction (SCR) process. The most core part of the SCR process is a denitration catalyst, a honeycomb type catalyst is generally adopted in China, and the arrangement mode of a high-temperature high-dust section is generally adopted. After the operation is long, the dust-containing flue gas can generate certain abrasion to the denitration catalyst. In addition, the smoke dust inevitably carries large-particle slag, and the slag enters the honeycomb-type denitration catalyst along with the smoke gas, and is likely to be clamped in honeycomb holes of the catalyst or along with a steel wire mesh under the catalyst, so that ash blockage is caused. If more plugging points are needed, the effective air passing area of the catalyst can be reduced, the air speed of the unplugged part is increased, the air speed exceeds the design specified air speed, and the abrasion to the catalyst is increased.
From practical experience, some units can cause serious abrasion of the upper catalyst layer after the denitration system is put into use for one year, and some units can even wear through the whole catalyst layer. The denitration efficiency is reduced, the ammonia injection amount must be increased to maintain the standard, or the standard can not be reached, and part of catalyst needs to be replaced again. The increase of the operation cost is not to say, the increase of the ammonia spraying amount can increase the ammonia escape concentration, increase the generation amount of ammonium bisulfate and aggravate the blockage and corrosion of the follow-up preheater of the empty device. Many aspects of attack and attempt are made to this problem in China. For example, the problems can be solved or alleviated from different sides by removing coarse particles in flue gas in a cyclone mode in the western-ann thermal institute, and adding an abrasion-proof layer mainly made of abrasion-proof ceramic blocks on a denitration catalyst in the environmental protection science and technology limited company of Hunan An Punuo; however, the problems of large investment, general effect and poor economical efficiency exist, and the problems need to be solved at present.
Disclosure of Invention
The purpose of the invention is: the method overcomes the defects in the prior art, and provides a method for reducing coarse particles in flue gas before the flue gas of various boilers and kilns enters SCR denitration, eliminating or reducing the blockage and abrasion of the flue gas to a subsequent denitration catalyst layer, and maintaining the long-term stable operation of a production system; simultaneously through the mixed flow increase flue gas degree of consistency to improve denitration reaction efficiency's SCR denitration flue gas preprocessing device and system thereof.
The technical scheme of the invention is as follows: the SCR denitration flue gas pretreatment device comprises a baffle plate arranged in a flue at the tail part of a boiler, wherein a plurality of blocks are arranged on the baffle plate in the flue to form a baffling area, the baffle plate comprises at least three planes or curved surfaces, and a wear-resistant ceramic plate is lined on the windward side of the baffle plate.
The advantage of this scheme lies in, the lateral entry of dusty flue gas is according to the baffling district that the baffling board that the certain interval was arranged formed, and the flue gas is turned to the direction and is flowed through this region by the force, but the large granule in the flue gas then is got rid of to the windward side of baffling board owing to inertia on to continue the slant forward slip under the flue gas promotion. When the slag blocking hook plate touches the turning part or the tail end of the baffle plate, kinetic energy disappears, and then the slag blocking hook plate falls to an ash bucket below under the action of the gravity of the slag blocking hook plate, so that the slag blocking hook plate is separated and trapped to prevent the slag blocking hook plate from entering a subsequent denitration catalyst to form blockage. Meanwhile, the flue gas turns to form mixed flow and turbulent flow after encountering the baffle plate, the mixing uniformity of the flue gas is increased, and after the denitration reducing agent is uniformly sprayed, the flue gas and the denitration reducing agent are contacted and mixed more uniformly, the reaction is more complete, and the denitration efficiency is favorably improved.
Furthermore, the baffle plate is made of a heat-resistant steel plate with the thickness of 2-4mm through a folded plate and welding, the baffle plate comprises three planes, the first plane is parallel to the flow direction of the flue gas, the second plane forms a certain included angle with the flow direction of the flue gas, and the third plane is parallel to and in the same direction with the flow direction of the flue gas.
Furthermore, the included angle between the second plane and the smoke flow direction is 30 O -60 O (ii) a Preferably, the second plane is at an angle of 40 degrees to the direction of flow of the flue gas O -55 O (ii) a Preferably, the second plane forms an angle of 45 degrees with the flue gas flow direction O 。
Furthermore, the windward sides of the second plane and the third plane are fully lined with wear-resistant ceramic plates, and the thickness of each wear-resistant ceramic plate is 3-6mm.
Furthermore, the tail ends of the second plane and the third plane are provided with hook plates,the hook of the hook plate is arranged towards the windward side, and the height of the hook plate protruding out of the corresponding plane of the folded plate is 10-30mm; the included angle between the hook plate and the corresponding plane of the baffle plate is 30 O -90 O 。
Furthermore, the baffle plates are vertically arranged on the cross section of the flue, and are arranged in the full length direction in the height direction, so that large particles can fall down conveniently.
Furthermore, a horizontal channeling pin is respectively arranged on the first plane and the third plane in the height direction at a certain distance, the first plane and the third plane are staggered.
Furthermore, in the horizontal direction of the cross section of the flue, the through long baffle plates are arranged side by side at regular intervals, and the distance between every two baffle plates is determined according to the width of the second plane of the baffle plate and the included angle between the second plane and the flue gas flow direction, so that the first plane of the second baffle plate does not exceed the third plane of the first baffle plate.
Furthermore, the cross section of the flue is divided into a plurality of subareas by heat-resistant section steel in the horizontal direction, and the width of each subarea is 1-2m; the heat-resistant section steel comprises angle steel, channel steel or rectangular square steel, and the upper end and the lower end of the section steel are firmly welded and fixed with the flue wall plate respectively.
Further, the baffle plate is arranged at the inlet end or the outlet end of a horizontal flue at the outlet of the tail flue of the boiler or the turning position of a vertical flue in front of the denitration reactor; the lower part of the horizontal flue in front of or behind the baffle plate is provided with an ash bucket, an ash discharge pipe and an ash discharge valve.
An SCR denitration flue gas pretreatment system comprises the flue gas pretreatment device; still include boiler furnace, denitration ammonia injection grid, denitration catalyst and denitration reactor, flue gas preprocessing device sets up the front end at the ammonia injection grid, and flue gas preprocessing device's front end or rear end are equipped with the ash bucket. The system effectively intercepts and removes large particles in the flue gas, effectively reduces or eliminates the blockage and abrasion of the denitration catalyst, and prolongs the service life of the catalyst.
The invention has the following characteristics: the invention adopts simple facilities and structures to effectively reduce, intercept and remove large particles in the flue gas, effectively reduces or eliminates the blockage and abrasion of the denitration catalyst, and prolongs the service life of the catalyst; the windward side of the baffle plate is lined with a wear-resistant ceramic plate, so that the abrasion of smoke dust to the baffle plate can be effectively prevented, and the service life of the baffle plate is ensured to be longer than the time limit requirement of boiler overhaul; meanwhile, when the flue gas passes through the baffling area, local mixed flow and turbulence are generated, the mixing among flue gas molecules is increased, the flue gas components are more uniform, the denitration reaction after the denitration reducing agent is uniformly sprayed is more complete and rapid, and the denitration efficiency is higher.
The detailed structure of the present invention will be further described with reference to the accompanying drawings and the detailed description.
Drawings
FIG. 1 is a schematic view of the overall structure of a baffle plate according to the present invention;
FIG. 2 is a schematic view of a single-plate baffle of the present invention;
FIG. 3 is a partially enlarged view of part A in FIG. 2;
FIG. 4 is a schematic view of the installation position of the first embodiment;
FIG. 5 is a schematic view of the installation position of the second embodiment;
1-baffle plate, 2-channeling pin, 3-first plane, 4-second plane, 5-third plane, 6-first hook plate, 7-ceramic plate, 8-second hook plate, 9-flue gas pretreatment device, 10-ash bucket, 11-boiler hearth, 12-ammonia spraying grid, 13-denitration catalyst and 14-denitration reactor.
Detailed Description
As shown in the attached drawings: the utility model provides a SCR denitration flue gas preprocessing device, includes the baffling board 1 that sets up in boiler afterbody flue, and baffling board 1 sets up a plurality of pieces in the flue, forms the baffling district, and baffling board 1 includes at least three plane or curved surface, is equipped with wear-resisting ceramic plate 7 on the windward side of baffling board 1.
According to the scheme, dust-containing flue gas transversely enters a baffling area formed by the baffle plates 1 arranged at a certain interval, the flue gas is forced to turn and flow through the baffling area, but large particles in the flue gas are thrown to the windward side of the baffle plates 1 due to inertia, and continue to slide forwards obliquely under the pushing of the flue gas. When the slag blocking hook plate touches the turning part or the tail end of the baffle plate 1, the kinetic energy disappears, and then the slag blocking hook plate falls to the ash bucket 10 below under the action of the gravity of the slag blocking hook plate, so that the slag blocking hook plate is separated and trapped to prevent the slag from entering the subsequent denitration catalyst 13 to form blockage. Meanwhile, the flue gas turns to mixed flow and turbulent flow after encountering the baffle plate 1, the uniformity of the flue gas is increased, the flue gas is uniformly sprayed into a denitration reducing agent, the flue gas and the denitration reducing agent are more uniformly mixed in a contact manner, the reaction is more complete, and the denitration efficiency is favorably improved.
In the embodiment, the baffle plate 1 is made of a heat-resistant steel plate with the thickness of 2-4mm through folding and welding; preferably, the baffle 1 has a thickness of 2.5/3/3.5mm; more preferably, baffling board 1 includes three plane, and first plane is parallel with the flue gas flow direction, and the second plane becomes certain contained angle with the flue gas flow direction, and the third plane is parallel syntropy with the flue gas flow direction, is convenient for improve the direction to the flue gas, improves the vortex simultaneously and increases even effect.
In an embodiment of the present invention, the included angle between the second plane and the smoke flow direction is 30 O -60 O (ii) a Preferably, the second plane is at an angle of 40 degrees to the direction of flow of the flue gas O -55 O (ii) a Preferably, the second plane forms an angle of 45 degrees with the direction of flow of the flue gas O (ii) a In the use process, the flue gas forms backflow when passing through the bending part of the baffle plate 1, so that the mixing effect of the flue gas is improved conveniently. Preferably, the windward sides of the second plane and the third plane are fully lined with wear-resistant ceramic plates 7, and the thickness of the wear-resistant ceramic plates 7 is 3-6mm; more preferably, the wear-resistant ceramic plate 7 has a thickness of 3/3.5/4/5mm. Optimally, hook plates are arranged at the tail ends of the second plane and the third plane, the hook plates corresponding to the second plane and the third plane are a first hook plate 6 and a second hook plate 8 respectively, hooks of the hook plates are arranged towards the windward side, and the height of the hook plates protruding out of the planes corresponding to the folded plates is 10-30mm; preferably, the height of the hook plate protruding flap corresponding to the plane is 12-28mm; more preferably, the height of the hook plate protruding from the corresponding plane of the folded plate is 15/20/25mm; the included angle between the hook plate and the corresponding plane of the baffle plate 1 is 30 O -90 O (ii) a Preferably, the angle between the hook plate and the corresponding plane of the baffle 1 is 35 O -70 O (ii) a Preferably, the included angle between the hook plate and the corresponding plane of the baffle plate 1 is 45 O /60 O 。
In the embodiment, the baffle plate 1 is vertically arranged on the cross section of the flue, and is arranged in the full length direction in the height direction, so that large particles can fall down conveniently.
In the embodiment, a horizontal shifting pin 2 is arranged on a first plane and a third plane in the height direction at certain intervals, and the first plane 3 and the third plane 5 are arranged in a staggered mode with the shifting pin 2. Preferably, in the horizontal direction of the cross section of the flue, the full-length baffle plates 1 are arranged side by side at regular intervals, the distance between every two baffle plates is determined according to the width of the second plane of the baffle plate 1 and the included angle between the second plane and the flue gas flow direction, and the first plane of the second baffle plate 1 is ensured not to exceed the third plane of the first baffle plate 1.
In the embodiment, the cross section of the flue is divided into a plurality of subareas by heat-resistant section steel in the horizontal direction, and the width of each subarea is 1-2m; the heat-resistant section steel comprises angle steel, channel steel or rectangular square steel, and the upper end and the lower end of the section steel are firmly welded and fixed with the flue plate respectively.
In the embodiment, the baffle plate 1 is installed at the inlet end or the outlet end of a horizontal flue at the outlet of a tail flue of a boiler, or the turning position of a vertical flue in front of a denitration reactor 14, which enters the denitration reactor 14; the lower part of the horizontal flue in front of or behind the baffle plate 1 is provided with an ash bucket 10, an ash discharge pipe and an ash discharge valve.
The invention adopts simple facilities and structures to effectively reduce, intercept and remove large particles in the flue gas, effectively reduces or eliminates the blockage and abrasion of the denitration catalyst 13, and prolongs the service life of the catalyst; the windward side of the baffle plate 1 is lined with a wear-resistant ceramic plate 7, so that the abrasion of smoke dust to the baffle plate 1 can be effectively prevented, and the service life of the baffle plate is ensured to be longer than the time limit requirement of boiler overhaul; meanwhile, when the flue gas passes through the baffling area, local mixed flow and turbulence are generated, the mixing among flue gas molecules is increased, the flue gas components are more uniform, the denitration reaction after the denitration reducing agent is uniformly sprayed is more complete and rapid, and the denitration efficiency is higher.
Example one
As shown in the attached fig. 1-4, an SCR denitration flue gas pretreatment device 9 for removing coarse particles from flue gas before denitration, which is described in the patent, is arranged at an outlet (inlet of a horizontal flue) of a flue gas outlet (inlet of a denitration device) at the tail of a boiler; firstly, the section of the flue is divided into a plurality of subareas by section steel, and the width of each subarea is 2 meters; baffle plates 1 are vertically arranged in each subarea side by side, the distance between every two baffle plates is determined according to the width of a second plane of the baffle plate 1 and the included angle between the second plane and the smoke flow direction, and the first plane of the second baffle plate 1 is ensured not to exceed the third plane of the first baffle plate 1. The baffle plate 1 is fixed by a shift pin 2, and the shift pin 2 penetrates through the partition section steel and is welded and fixed with the partition section steel.
The baffle plate 1 is formed by combining three planes, wherein the first plane is parallel to the flow direction of the flue gas, the second plane forms a certain included angle with the flow direction of the flue gas, and the third plane is parallel and same to the flow direction of the flue gas. The included angle between the second plane and the smoke flow direction is 45 O . The windward sides of the second plane and the third plane are fully lined with wear-resistant ceramic plates 7, and the thickness of each wear-resistant ceramic lining plate is 4mm. Hook plates with a certain height are arranged at the end edges of the second plane and the third plane, the hook plates hook the windward side, and the height of the corresponding plane of the protruding folded plate is 20mm.
When the device is in operation, smoke transversely enters the area of the baffle device, after passing through the first plane of the baffle plate 1, the smoke is collided with the second plane 4 which is obliquely arranged to generate steering, large particles in the smoke are thrown out due to inertia, and are continuously pushed to the oblique front along the baffle plate after colliding with the second plane 4 to dissipate energy and reduce the speed, the hook plate collided with the tail end of the second plane 4 is hooked to be completely stalled, the particles fall into an ash hopper 10 which is obliquely below under the action of the weight of the particles, and the particles are regularly discharged by the ash discharge pipe and the valve. Large particles in the flue gas passing through the baffle plate 1 device are greatly reduced or eliminated, the blockage and ash blockage of the flue gas in honeycomb holes of the subsequent denitration catalyst 13 are avoided, the abrasion of the catalyst caused by the uneven flue gas is prevented, and the mechanical life of the catalyst is prolonged. The windward side of the baffle plate 1 is fully lined with a wear-resistant ceramic plate 7 to enhance the wear resistance of the baffle plate 1 and ensure that the service life of the baffle plate meets the requirement of the overhaul period of the boiler.
Meanwhile, when the flue gas passes through the baffle plate 1 device, the flue gas collides with the second plane and the third plane of the folded plate twice to turn, so that a local mixed flow and turbulent flow area is generated, the mixing among flue gas components is increased, the flue gas is more uniform, the flue gas reacts more completely and fully after the denitration reducing agent is sprayed in sequence and uniformly, and the denitration efficiency is higher.
Example two
As shown in fig. 5, a horizontal flue led out from a flue at the tail of a boiler is transferred into a vertical flue of a denitration reactor 14, or an SCR denitration flue gas pretreatment device 9 of the present invention is installed in front of an ammonia injection grid 12, and the installation mode and the structure of a baffle plate 1 are the same as those of the first embodiment, except that an ash hopper 10 at the lower part is different from the front lower part of the first embodiment, but is arranged at the rear lower part of the pretreatment device. The flue gas turns to and the collision that takes place when baffling board 1 device region is also the same, and big granule thing falls into back below ash bucket 10 and is collected the discharge after baffling board 1 entrapment equally, has alleviateed or has eliminated the jam and the stifled ash in follow-up denitration catalyst 13 honeycomb hole equally, prevents to cause local wind speed too fast to produce wearing and tearing because of the cigarette wind inequality, extension catalyst mechanical life. Because of flue gas turn round, collision and the mixed flow in baffling board 1 region equally, make the flue gas more even, follow-up denitration reaction is more abundant completely, and denitration efficiency is higher.
The above embodiment describes only two installation positions and a certain structural size of the baffle 1 device in the denitration system. On the basis, with different denitration system structures, people in the same industry can carry out different arrangement modes and small structural changes of the baffle plate 1, and the denitration system belongs to the protection scope of the invention.
EXAMPLE III
The utility model provides a deNOx systems including SCR denitration flue gas preprocessing device, includes boiler furnace 11, denitration ammonia injection grid 12, denitration catalyst 13 and denitration reactor 14, and flue gas preprocessing device 9 sets up the front end at ammonia injection grid 12, and flue gas preprocessing device 9's front end or rear end are equipped with ash bucket 10, and flue gas preprocessing device 9's concrete structure is the same with in the embodiment one.
The above description is of the preferred embodiment of the present invention and the technical principle applied thereto, and it will be apparent to those skilled in the art that any equivalent changes, simple substitutions and other obvious changes based on the technical solution of the present invention can be made without departing from the spirit and scope of the present invention.
Claims (10)
1. The utility model provides a SCR denitration flue gas preprocessing device, is including setting up the baffling board in boiler afterbody flue, its characterized in that: the baffle plate in the flue is provided with a plurality of blocks to form a baffling area, the baffle plate comprises at least three planes or curved surfaces, and a wear-resistant ceramic plate is arranged on the windward side of the baffle plate.
2. The SCR denitration flue gas pretreatment device of claim 1, characterized in that: the baffle plate is made of a heat-resistant steel plate with the thickness of 2-4mm through a folded plate and welding, the baffle plate comprises three planes, the first plane is parallel to the flow direction of the flue gas, the second plane forms a certain included angle with the flow direction of the flue gas, and the third plane is parallel to and in the same direction with the flow direction of the flue gas; the included angle between the second plane and the smoke flow direction is 30 O -60 O 。
3. The SCR denitration flue gas pretreatment device of claim 2, characterized in that: the windward sides of the second plane and the third plane are fully lined with wear-resistant ceramic plates, and the thickness of each wear-resistant ceramic plate is 3-6mm.
4. The SCR denitration flue gas pretreatment device of claim 2, characterized in that: the tail ends of the second plane and the third plane are provided with hook plates, hooks of the hook plates are arranged towards the windward side, and the height of the hook plates protruding out of the folded plates and corresponding to the planes is 10-30mm; the included angle between the hook plate and the corresponding plane of the baffle plate is 30 O -90 O 。
5. The SCR denitration flue gas pretreatment device of any one of claims 1 to 4, characterized in that: the baffle plates are vertically arranged on the cross section of the flue, and are arranged in the full length direction in the height direction, so that large particles can fall down conveniently.
6. The SCR denitration flue gas pretreatment device of claim 5, characterized in that: the pins are arranged on the first plane and the third plane in the height direction at certain intervals, and the pins are arranged on the first plane and the third plane in a staggered mode.
7. The SCR denitration flue gas pretreatment device of claim 5, characterized in that: in the horizontal direction of the cross section of the flue, the full-length baffle plates are arranged side by side at certain intervals, the distance between every two baffle plates is determined according to the width of the second plane of the baffle plate and the included angle between the second plane and the flue gas flow direction, and the first plane of the second baffle plate is ensured not to exceed the third plane of the first baffle plate.
8. The SCR denitration flue gas pretreatment device of claim 7, characterized in that: dividing the cross section of the flue into a plurality of subareas by using heat-resistant section steel in the horizontal direction, wherein the width of each subarea is 1-2m; the heat-resistant section steel comprises angle steel, channel steel or rectangular square steel, and the upper end and the lower end of the section steel are firmly welded and fixed with the flue plate respectively.
9. The SCR denitration flue gas pretreatment device of claim 8, characterized in that: the baffle plate is arranged at the inlet end or the outlet end of a horizontal flue at the outlet of a tail flue guide of the boiler or the turning position of a vertical flue in front of the denitration reactor, which enters the denitration reactor; the lower part of the horizontal flue in front of or behind the baffle plate is provided with an ash bucket, an ash discharge pipe and an ash discharge valve.
10. The utility model provides a SCR denitration flue gas pretreatment systems which characterized in that: comprising a flue gas pretreatment device according to any of claims 1 to 9.
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| CN102728220A (en) * | 2012-07-05 | 2012-10-17 | 刘辉 | Device for purification treatment to malodorous gas in supergravity field photo-catalytic oxidation |
| CN103776042A (en) * | 2012-10-24 | 2014-05-07 | 中国石油化工股份有限公司 | CO boiler having dustproof function and denitration function |
| CN102989315A (en) * | 2012-12-12 | 2013-03-27 | 山东大学 | Deashing device for SCR flue gas denitration system |
| CN106345293A (en) * | 2016-11-03 | 2017-01-25 | 无锡华光新动力环保科技股份有限公司 | Fume turbulent flow device used in SCR denitrification system |
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