CN113491942A - SCR denitration reaction tower water conservancy diversion equipartition device of cement kiln - Google Patents
SCR denitration reaction tower water conservancy diversion equipartition device of cement kiln Download PDFInfo
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- CN113491942A CN113491942A CN202110934358.1A CN202110934358A CN113491942A CN 113491942 A CN113491942 A CN 113491942A CN 202110934358 A CN202110934358 A CN 202110934358A CN 113491942 A CN113491942 A CN 113491942A
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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
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- 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
- B01D2258/0233—Other waste gases from cement factories
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Abstract
The invention discloses a diversion and uniform distribution device of an SCR (selective catalytic reduction) denitration reaction tower of a cement kiln.A gas diversion and uniform distribution section is arranged between a waste gas inlet and a catalyst layer; the gas diversion uniform distribution section is provided with a diversion uniform distribution grid which is vertically distributed with the gas flowing direction, and the diversion uniform distribution grid comprises a plurality of diversion uniform distribution plates which are parallel to each other and are uniformly spaced. By adopting the technical scheme, the flow direction of the gas in the waste gas concentration area is changed by arranging the guide plate with a special structure, the gas pressure far away from the central area is reduced, the waste gas can uniformly pass through the catalyst layer, the concentration of the waste gas entering the catalyst tends to be uniform, the gas reaching the surface of the catalyst is ensured to be uniform, the speed deviation is less than or equal to 5%, the uniform dispersion degree of the gas on the cross section of the SCR reaction tower is improved, the uniformity of the gas entering the catalyst is ensured, and the efficiency of SCR denitration reaction is improved.
Description
Technical Field
The invention belongs to the technical field of environmental protection and emission reduction in cement production, and relates to a novel NOx emission reduction technology for a dry cement clinker production line. More specifically, the invention relates to a uniform diversion distribution device of an SCR denitration reaction tower of a cement kiln.
Background
1. Denitration technical background of cement production line:
under the background of national ecological civilization construction, the pollutant discharge of each industry is increasingly strict, wherein for NO in cement industryxThe emission is 100mg/Nm3Even 50mg/Nm3While at the same time strictly controlling the critical requirements of ammonia slip. The existing technologies such as staged combustion and SNCR denitration are difficult to meet, and the SCR denitration technology becomes the main direction of the flue gas denitration technology in the cement industry with high-efficiency denitration efficiency and ammonia escape control.
An SCR (Selective Catalytic Reduction) denitration system mainly comprises an SCR denitration reaction tower, an air compressor system and an ammonia spraying system; wherein, SCR denitration reaction tower is whole system's key, mainly bears functions such as the equipartition of gas, nitrogen oxide reduction, and gas equipartition device sets up in the front end of SCR denitration reaction tower, is that nitrogen oxide takes place reduction reaction on the catalyst surface, produces harmless gaseous N2The core device of (1).
2. The SCR denitration process principle is as follows:
the SCR process is a reducing agent (NH)3Or urea) with NO selectively in the presence of a catalystxReaction to form N2And H2O instead of by O2Oxidized, and is therefore referred to as "selective". As shown in fig. 1, the main reactions in the SCR denitration process are as follows:
3. SCR denitration process flow:
at present, an SCR denitration system is mainly in a high-temperature arrangement form and a medium-temperature arrangement form, wherein gas at 280-350 ℃ or 180-220 ℃ at an outlet of a preheater is introduced into an SCR reaction tower, and nitrogen oxides in waste gas are subjected to reduction reaction under the action of a catalyst to produce N2The main flow is shown in fig. 2 and fig. 3.
4. SCR reaction tower
The SCR reaction tower is one of the main equipment for SCR catalytic reduction denitration, and mainly comprises an inlet, a gas diversion uniform distribution device and a bottom dust conveying device, wherein the catalyst is arranged in the middle, each layer of catalyst is provided with an ash cleaning device, and necessary equipment such as a temperature pressure instrument, an overhaul platform and the like is arranged.
However, in the prior art, the problem of uniform distribution of the gas diversion of the SCR reaction tower is not well solved; and because the cement kiln has high flue gas temperature and large flow and is not easy to uniformly distribute, the denitration can not meet the process requirement, and adverse consequences are brought to environmental protection and emission reduction.
Disclosure of Invention
The invention provides a diversion and uniform distribution device for an SCR (selective catalytic reduction) denitration reaction tower of a cement kiln, and aims to enable the concentration of waste gas entering a catalyst to be uniform and improve the SCR denitration efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention relates to a diversion and uniform distribution device of an SCR (selective catalytic reduction) denitration reaction tower of a cement kiln, wherein the SCR reaction tower comprises a waste gas inlet, a catalyst layer and a purified gas outlet, and a gas diversion and uniform distribution section is arranged between the waste gas inlet and the catalyst layer; the gas water conservancy diversion equipartition section set up the water conservancy diversion equipartition grid with gas flow direction vertical distribution, water conservancy diversion equipartition grid include a plurality of parallel and the even water conservancy diversion equipartition board in interval of each other.
The water conservancy diversion equipartition grid set up the three-layer in gaseous water conservancy diversion equipartition section, from last to being first layer water conservancy diversion equipartition grid, second floor water conservancy diversion equipartition grid and third layer water conservancy diversion equipartition grid respectively down, and each layer water conservancy diversion equipartition grid suits with gaseous water conservancy diversion equipartition section inner chamber size, from last to down, from little to big.
The cross section of the flow guide uniform distribution plate is in a V shape with an opening facing downwards.
The distance between the V-shaped symmetrical surfaces of the two adjacent flow guide uniform distribution plates is 70-200 mm.
The included angle of two side edges of the V-shaped structure is 15-28 degrees.
The V-shaped tip adopts arc transition, and the arc radius is R2-R8 mm.
Two outermost edges of the first layer of the flow guide uniform distribution grid, which are distributed on the flow guide uniform distribution plate, are respectively provided with a flow guide side plate; the flow guide side plate is parallel to the flow guide uniform distribution plate; the inclined direction of the flow guide side plate 8 is the same as the outer side edge of the adjacent flow guide uniform distribution plate 7.
The distance between the diversion side plate and the side edge in the plane direction of the diversion uniformly-distributed grating is 60-100 mm.
The flow guide uniform distribution plates of the first layer of flow guide uniform distribution grid and the second layer of flow guide uniform distribution grid, and the flow guide uniform distribution plates of the second layer of flow guide uniform distribution grid and the third layer of flow guide uniform distribution grid are all vertically distributed.
The flow guide uniformly distributed grids are supported and fixed on the inner wall of the SCR reaction tower through flow guide plates; the guide plate support is made of flat steel with the width of 50-150 mm; the length direction of the guide plate support is perpendicular to the uniform guide distribution plate.
By adopting the technical scheme, the efficient gas diversion and uniform distribution device is arranged at the inlet of the SCR reaction tower, the flow direction of gas in a waste gas concentration area is changed by arranging the guide plate with a special structure, the gas pressure far away from a central area is reduced, waste gas can uniformly pass through the catalyst layer, the concentration of the waste gas entering the catalyst tends to be uniform, the uniformity of the gas reaching the surface of the catalyst is ensured, the speed deviation is less than or equal to 5%, the uniform dispersion degree of the gas on the cross section of the SCR reaction tower is improved, the uniformity of the gas entering the catalyst is ensured, and the efficiency of SCR denitration reaction is improved.
Drawings
The contents of the drawings and the reference numbers in the drawings are briefly described as follows:
FIG. 1 is a schematic diagram of SCR flue gas denitration;
FIG. 2 is a process structure diagram of a high-temperature SCR denitration process;
FIG. 3 is a process structure diagram of a medium-temperature SCR denitration process;
FIG. 4 is a schematic structural diagram of an SCR reaction tower;
FIG. 5 is a schematic structural view of an SCR inlet flow-guiding uniform-distribution device of the present invention;
FIG. 6 is a schematic structural diagram of a baffle in the flow guiding uniform distribution section of the present invention;
FIG. 7 is a schematic top view of the flow-guiding equispaced grille of the present invention.
Labeled as:
1. PH boiler, 2, cyclone, 3, decomposing furnace, 4, rotary kiln, 5, SCR reaction tower, 6, water conservancy diversion equipartition grid, 7, water conservancy diversion equipartition board, 8, water conservancy diversion sideboard, 9, gaseous water conservancy diversion equipartition section, 10, catalyst layer, 11, waste gas entry, 12, purified gas outlet, 13, guide plate support.
Detailed Description
The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.
The structure of the invention as shown in fig. 4 to 7 is a diversion uniform distribution device of an SCR denitration reaction tower 5 of a cement kiln, which is used for a novel dry kiln 2500 t/d-12000 t/d clinker line SCR denitration system. The invention provides a gas diversion and uniform distribution device arranged in front of an SCR denitration reaction tower, aiming at the problems of high temperature, large flow and difficult uniform distribution of cement kiln flue gas, and relating to denitration efficiency and long-term stability of SCR system operation. The SCR reaction tower 5 comprises an exhaust gas inlet 11, a catalyst layer 10 and a purified gas outlet 12, and a gas diversion uniform distribution section 9 is arranged between the exhaust gas inlet 11 and the catalyst layer 10. Set up high-efficient gaseous water conservancy diversion equipartition device at SCR reaction tower entry, can be effectual with gaseous distributing, make gaseous even catalyst that passes through to guarantee SCR denitration reaction efficiency.
In order to solve the problems in the prior art and overcome the defects thereof, and achieve the invention aims of enabling the concentration of the exhaust gas entering the catalyst to tend to be uniform and improving the SCR denitration efficiency, the invention adopts the technical scheme that:
as shown in fig. 5 and 6, in the diversion and uniform distribution device for the SCR denitration reaction tower of the cement kiln of the present invention, the gas diversion and uniform distribution section 9 is provided with a diversion and uniform distribution grid 6 which is distributed in a direction perpendicular to the gas flow direction;
the flow guide uniform distribution grid 6 comprises a plurality of flow guide uniform distribution plates 7 which are parallel to each other and are uniformly spaced. As shown in fig. 7.
The invention reduces the pressure far away from the central area by arranging the guide plate 7 with a special structure so as to improve the dispersion uniformity of the gas on the section and ensure the uniformity of the gas reaching the surface of the catalyst. Aiming at the defects of the prior art, the invention deeply analyzes the waste gas condition of the existing cement kiln production line, a special diversion uniform distribution device is arranged at the front end of the inlet of the SCR reaction tower, and the concentration of the waste gas entering the catalyst tends to be uniform by changing the flow direction of the gas in the waste gas concentration area, thereby improving the SCR denitration efficiency.
The right drawing in fig. 5 is a front sectional view of the gas flow guiding and distributing section 9, and the left drawing is a side sectional view.
The water conservancy diversion equipartition grid 6 set up the three-layer in gaseous water conservancy diversion equipartition section 9, from last to being first layer water conservancy diversion equipartition grid, second floor water conservancy diversion equipartition grid and third layer water conservancy diversion equipartition grid respectively down, and each layer water conservancy diversion equipartition grid 6 suits with the inner chamber size of gaseous water conservancy diversion equipartition section 9, from last to down, from little to big.
The diversion uniform distribution device arranged below the inlet of the SCR reaction tower mainly comprises a first diversion uniform distribution grid layer, a second diversion uniform distribution grid layer and a third diversion uniform distribution grid layer, wherein the three diversion uniform distribution grid layers are arranged at certain intervals to play a good role in guiding gas and guiding gas uniformly. After passing through the three-layer flow guide uniform distribution device, waste gas can uniformly pass through the catalyst, the speed deviation is less than or equal to 5%, the uniformity of the gas entering the catalyst is ensured, and the SCR can obtain good denitration efficiency.
The cross section of the flow guide uniform distribution plate 7 is in a V shape with an opening facing downwards. I.e. an inverted V-shaped structure is used.
The inverted V-shaped structure enables the airflow to be dispersed when flowing downwards but not concentrated; a plurality of such dispersed gas streams are staggered with respect to each other so that the gas flow distribution is uniform.
The distance between the V-shaped symmetrical surfaces of the two adjacent flow guide uniform distribution plates 7 is 70-200 mm.
The included angle of two side edges of the V-shaped structure is 15-28 degrees. The V-shaped tip adopts arc transition, and the arc radius is R2-R8 mm.
As shown in fig. 6, two outermost edges of the flow-guiding uniform distribution plates 7 on the first layer of flow-guiding uniform distribution grid are respectively provided with a flow-guiding side plate 8; the flow guide side plate 8 is parallel to the flow guide uniform distribution plate 7; the inclined direction of the flow guide side plate 8 is the same as the outer side edge of the adjacent flow guide uniform distribution plate 7.
The purpose is to reduce the pressure at two sides and increase the air permeability, and the guide side plate 8 form is adopted, and the included angle between the guide side plate and the horizontal plane is 50-80 degrees; this is because the gas pressure near the edge is greater. And the second layer of flow guide uniform distribution grating and the third layer of flow guide uniform distribution grating are not provided with a flow guide side plate 8 any more. Because there is a drop in the edge pressure.
The interval and the angle of the second layer of the diversion uniform distribution grating are the same as those of the third layer of the diversion uniform distribution grating, but the diversion uniform distribution plates 7 of the second layer of the diversion uniform distribution grating and the third layer of the diversion uniform distribution grating are staggered and mutually perpendicular.
The distance between the diversion side plate 8 and the side edge in the plane direction of the diversion uniformly-distributed grating is 60-100 mm.
The flow guide uniform distribution plates 7 of the first layer of flow guide uniform distribution grid and the second layer of flow guide uniform distribution grid, and the flow guide uniform distribution plates 7 of the second layer of flow guide uniform distribution grid and the third layer of flow guide uniform distribution grid are all vertically distributed.
As shown in fig. 5 and 6, the three layers of flow-guiding grids are uniformly distributed and vertically arranged, for example, the first layer is transversely arranged, the second layer is vertically arranged and staggered with the first layer by 90 degrees, and the third layer is transversely arranged and staggered with the second layer by 90 degrees.
Therefore, the air flows are staggered and fully mixed for a plurality of times, so that the concentration and the speed of the waste gas entering the catalyst are more uniform, and the catalytic effect is improved.
The diversion uniform distribution grid 6 is fixed on the inner wall of the SCR reaction tower 5 through a diversion plate support 13; the guide plate support 13 is made of flat steel with the width of 50-150 mm; the length direction of the guide plate support 13 is vertical to the uniform guide distribution plate 7.
The guide plate support 13 is made of 50-150 mm wide flat steel and mainly plays a role in supporting the guide side plate 8 and the guide uniform distribution plate 7. The flat surface of the flat steel is perpendicular to the plane of the grating, so that the flat steel can play a stable supporting role.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (10)
1. The SCR denitration reaction tower diversion and uniform distribution device of the cement kiln comprises an SCR reaction tower (5) and a cement kiln, wherein the SCR reaction tower comprises a waste gas inlet (11), a catalyst layer (10) and a purified gas outlet (12), and a gas diversion and uniform distribution section (9) is arranged between the waste gas inlet (11) and the catalyst layer (10); the method is characterized in that: the gas flow guiding and distributing section (9) is provided with a flow guiding and distributing grid (6) which is vertically distributed with the gas flowing direction, and the flow guiding and distributing grid (6) comprises a plurality of flow guiding and distributing plates (7) which are parallel to each other and are uniformly spaced.
2. The cement kiln SCR denitration reaction tower diversion and uniform distribution device as set forth in claim 1, characterized in that: the three-layer air guide uniform distribution grid (6) is arranged in the air guide uniform distribution section (9) and is respectively a first layer air guide uniform distribution grid, a second layer air guide uniform distribution grid and a third layer air guide uniform distribution grid from top to bottom, and the inner cavity size of each layer of air guide uniform distribution grid (6) and the inner cavity size of the air guide uniform distribution section (9) are adaptive to each other from top to bottom and are from small to large.
3. The cement kiln SCR denitration reaction tower diversion and uniform distribution device as set forth in claim 1, characterized in that: the cross section of the flow guide uniform distribution plate (7) is in a V shape with an opening facing downwards.
4. The cement kiln SCR denitration reaction tower diversion and uniform distribution device as set forth in claim 3, characterized in that: the distance between the V-shaped symmetrical surfaces of the two adjacent flow guide uniform distribution plates (7) is 70-200 mm.
5. The cement kiln SCR denitration reaction tower diversion and uniform distribution device as set forth in claim 3, characterized in that: the included angle of two side edges of the V-shaped structure is 15-28 degrees.
6. The cement kiln SCR denitration reaction tower diversion and uniform distribution device as set forth in claim 3, characterized in that: the V-shaped tip adopts arc transition, and the arc radius is R2-R8 mm.
7. The cement kiln SCR denitration reaction tower diversion and uniform distribution device as set forth in claim 2, characterized in that: two outermost edges of the diversion uniform distribution plates (7) on the first layer of diversion uniform distribution grid are respectively provided with a diversion side plate (8); the flow guide side plate (8) is parallel to the flow guide uniform distribution plate (7); the inclined direction of the flow guide side plate (8) is the same as the outer side edge of the adjacent flow guide uniform distribution plate (7).
8. The cement kiln SCR denitration reaction tower diversion and uniform distribution device as set forth in claim 7, characterized in that: the distance between the diversion side plate (8) and the side edge in the plane direction of the diversion uniformly-distributed grating is 60-100 mm.
9. The cement kiln SCR denitration reaction tower diversion and uniform distribution device as set forth in claim 2, characterized in that: the flow guide uniform distribution plates (7) of the first layer of flow guide uniform distribution grid and the second layer of flow guide uniform distribution grid, and the flow guide uniform distribution plates (7) of the second layer of flow guide uniform distribution grid and the third layer of flow guide uniform distribution grid are all vertically distributed.
10. The cement kiln SCR denitration reaction tower diversion and uniform distribution device as set forth in claim 1, characterized in that: the flow guide uniformly distributed grids (6) are fixed on the inner wall of the SCR reaction tower (5) through flow guide plate supports (13); the guide plate support (13) is made of flat steel with the width of 50-150 mm; the length direction of the guide plate support (13) is vertical to the guide uniform distribution plate (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110934358.1A CN113491942A (en) | 2021-08-13 | 2021-08-13 | SCR denitration reaction tower water conservancy diversion equipartition device of cement kiln |
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| CN202110934358.1A CN113491942A (en) | 2021-08-13 | 2021-08-13 | SCR denitration reaction tower water conservancy diversion equipartition device of cement kiln |
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| CN113491942A true CN113491942A (en) | 2021-10-12 |
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| CN202110934358.1A Pending CN113491942A (en) | 2021-08-13 | 2021-08-13 | SCR denitration reaction tower water conservancy diversion equipartition device of cement kiln |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113828153A (en) * | 2021-10-28 | 2021-12-24 | 武汉森源蓝天环境科技工程有限公司 | Tower type catalyst reactor |
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2021
- 2021-08-13 CN CN202110934358.1A patent/CN113491942A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113828153A (en) * | 2021-10-28 | 2021-12-24 | 武汉森源蓝天环境科技工程有限公司 | Tower type catalyst reactor |
| CN113828153B (en) * | 2021-10-28 | 2024-05-24 | 武汉森源蓝天环境科技工程有限公司 | Tower type catalyst reactor |
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