CN213790969U

CN213790969U - Uniform distribution flow guide system of SCR (Selective catalytic reduction) denitration reaction tower

Info

Publication number: CN213790969U
Application number: CN202022547125.XU
Authority: CN
Inventors: 孔取和; 李乐意; 荆云; 周金波; 范警卫; 李祥超; 李志强; 宗青松
Original assignee: Anhui Conch Construction Materials Design Institute Co Ltd
Current assignee: Anhui Conch Construction Materials Design Institute Co Ltd
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2021-07-27
Anticipated expiration: 2030-11-06

Abstract

The utility model discloses a SCR denitration reaction tower equipartition diversion system, its characterized in that: be equipped with multilayer water conservancy diversion layer at the entry end of reaction tower, the water conservancy diversion layer is the equal cloth layer of first layer water conservancy diversion respectively from top to bottom, and the equal cloth layer of second floor water conservancy diversion and the equal cloth layer of third layer water conservancy diversion are equipped with second floor guide plate and the third layer guide plate of vertical arrangement respectively on the equal cloth layer of second floor water conservancy diversion and the equal cloth layer of third layer water conservancy diversion. The utility model discloses SCR denitration reaction tower equipartition water conservancy diversion system, simple structure arranges rationally, can effectually distribute gaseous, makes gaseous even catalyst that passes through, improves SCR denitration reaction efficiency, has stronger practicality and better application prospect.

Description

Uniform distribution flow guide system of SCR (Selective catalytic reduction) denitration reaction tower

Technical Field

The utility model belongs to the technical field of cement clinker production line SCR denitration, more specifically say, relate to SCR denitration reaction tower equipartition water conservancy diversion system.

Background

(1) The production process of the clinker:

the materials prepared according to a certain proportion are fed from the top of a preheater, preheated by a cyclone preheater and then enter a decomposing furnace, decomposed therein, then enter a rotary kiln for calcination, and then enter a grate cooler for cooling, and finally the clinker needed by people is obtained.

(2) Denitration technical background of cement production line

The cement is an important prop industry of national economy, the total output of the Chinese cement industry shows a rapid growth situation in nearly two decades due to the needs of economic development, and as the end of 2019, 1600 cement production lines are accumulated by novel dry-process cement production lines in China, and the cement production capacity is 23.3 hundred million tons.

The rapid development of urbanization and economy does not depart from the contribution of the cement industry, but brings considerable environmental problems, and because the production of cement clinker requires the combustion of fuel to provide heat formation of clinker minerals, a certain amount of nitrogen oxides is generated in the process, and a series of laws and regulations are issued by the national and local governments to limit the emission of NOx.

According to the existing regulations, the NOx emission concentration in general regions is controlled to be less than or equal to 400mg/Nm3, the NOx emission concentration in key regions is controlled to be less than or equal to 320mg/Nm3, and local regulations and regulations are issued by environmental protection departments of local governments to strictly control the emission of pollutants, for example, the 100mg/Nm3 control index requirements are implemented in regions such as Jiangsu, Shandong, Henan and Zhejiang, and the peak staggering production is implemented in regions such as Shandong, Hebei, Shaanxi, Shanxi, Anhui, Jiangsu and Zhejiang in order to control the pollution.

At present, the most widely applied denitration technologies in the cement industry mainly comprise staged combustion and selective non-catalytic reduction denitration (SNCR denitration), wherein the staged combustion is front-end control, the operation cost is not high, but the denitration efficiency is low and is only about 40%; as a measure for further reducing the NOx emission concentration, the SNCR denitration method has the characteristics of simple system flow and low investment, and is widely applied to the cement industry, but the method has the problems of low ammonia water utilization efficiency, large ammonia water consumption, high ammonia escape, corrosion of pipelines and equipment and the like.

When the emission concentration of NOx is further tightened and the ammonia escape index is strictly controlled, the staged combustion and SNCR denitration technology cannot meet the increasingly strict NOx emission standard, and the selective catalytic reduction technology (SCR denitration technology) promotes the reaction of NH3 and NOx by means of high-activity component catalytic reduction, so that the denitration efficiency is high (more than 95%), the ammonia water utilization rate is high, and the like.

The SCR process is a process in which a reductant (NH3 or urea) selectively reacts with NOx to form N2 and H2O over a catalyst, rather than being oxidized by O2, and is referred to as "selectivity". The main reaction is as follows:

ammonia

Urea

The denitration principle diagram is shown in figure 1.

The SCR reaction tower is one of the main equipment for SCR catalytic reduction denitration, and mainly comprises a guide device with uniformly distributed inlets and a dust conveying device arranged at the bottom, wherein the catalyst is arranged at the middle position, and each layer of catalyst is provided with an ash cleaning device, a temperature pressure instrument, an overhaul platform and other necessary equipment. The flow direction of waste gas has important influence to the denitration, exists among the prior art because of the waste gas flow direction inequality leads to the circumstances that denitration efficiency is low, awaits further improvement.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem that prior art exists, provide a simple structure, arrange rationally, can effectually distribute gaseous, make gaseous even catalyst that passes through, improve SCR denitration reaction tower equipartition water conservancy diversion system of SCR denitration reaction efficiency.

In order to realize the purpose, the utility model discloses the technical scheme who takes does: this kind of SCR denitration reaction tower equipartition diversion system that provides, its characterized in that: be equipped with multilayer water conservancy diversion layer at the entry end of reaction tower, the water conservancy diversion layer is the equal cloth layer of first layer water conservancy diversion respectively from top to bottom, and the equal cloth layer of second floor water conservancy diversion and the equal cloth layer of third layer water conservancy diversion are equipped with second floor guide plate and the third layer guide plate of vertical arrangement respectively on the equal cloth layer of second floor water conservancy diversion and the equal cloth layer of third layer water conservancy diversion.

In order to make the above technical solution more detailed and concrete, the present invention further provides the following preferable technical solution to obtain satisfactory practical effect:

the first layer of flow guide uniform distribution layer comprises first transverse flow guide plates and first longitudinal flow guide plates which are arranged in a transverse-longitudinal staggered mode.

The middle of the first transverse guide plate is taken as a symmetrical center, and the lower ends of the first transverse guide plates at two sides incline to two sides respectively; the first longitudinal guide plate takes the middle as a symmetrical center, and the lower ends of the first longitudinal guide plates on two sides incline to two sides respectively.

The second layer of flow guide uniform cloth layer comprises a second layer of supporting rods and a second layer of flow guide plate supported on the second layer of supporting rods.

The second layer of guide plates are V-shaped structural plates with downward openings.

The second layer of guide plates extend along the direction vertical to the second layer of support rods; and a plurality of second-layer guide plates which are arranged at intervals are arranged in the length direction of the second-layer support rod.

The third layer of flow guide uniform cloth layer comprises a third layer of support rod and a third layer of flow guide plate supported on the third layer of support rod.

The third layer of guide plate is a V-shaped structural plate with a downward opening.

The third layer of guide plate extends along the direction vertical to the third layer of support rod; and a plurality of third-layer guide plates are arranged at intervals in the length direction of the third-layer support rod.

The edge of the two sides of the third layer of guide plate is provided with an edge opening guide plate, the edge opening guide plate is parallel to the third layer of guide plate, the edge opening guide plate is a V-shaped structural plate with a downward opening, and the upper end of the V-shaped structural plate is provided with a guide plate opening.

Compared with the prior art, the utility model, have following advantage: the utility model discloses SCR denitration reaction tower equipartition water conservancy diversion system, simple structure arranges rationally, can effectually distribute gaseous, makes gaseous even catalyst that passes through, improves SCR denitration reaction efficiency, has stronger practicality and better application prospect.

Drawings

The contents of the drawings and the reference numerals in the drawings of the present specification will be briefly described as follows:

FIG. 1 is a schematic diagram of denitration;

FIG. 2 is a schematic structural view of a uniform distribution flow guide system of the reaction tower of the present invention;

FIG. 3 is a schematic structural view of a uniform distribution flow guide system of the reaction tower of the present invention;

FIG. 4 is a top view of the first layer of the present invention;

FIG. 5 is a front view of the first layer of the uniform cloth layer for guiding flow

FIG. 6 is a top view of the second layer of the present invention;

FIG. 7 is a front view of a second layer of the diversion uniform cloth layer of the present invention;

FIG. 8 is an enlarged view of A in FIG. 7;

fig. 9 is a top view of the third layer of the flow-guiding uniform-distribution layer of the present invention;

FIG. 10 is a front view of a third layer of the flow-guiding uniform cloth layer of the present invention;

FIG. 11 is an enlarged view of B in FIG. 10;

FIG. 12 is an enlarged view of C in FIG. 10;

labeled as: 1. the inlet end, 2, first layer water conservancy diversion all-cloth layers, 21, first horizontal guide plate, 22, first vertical guide plate, 3, second floor water conservancy diversion all-cloth layers, 31, second floor bracing piece, 32, second floor guide plate, 4, third layer water conservancy diversion all-cloth layers, 41, third layer bracing piece, 42, third layer guide plate, 43, marginal opening guide plate, 44, guide plate opening.

Detailed Description

The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.

The utility model discloses this kind of SCR denitration reaction tower equipartition water conservancy diversion system, as shown in figure 2, 3, be equipped with multilayer water conservancy diversion layer at the entry end 1 of reaction tower, the water conservancy diversion layer is the equal cloth layer of first layer water conservancy diversion 2 from top to bottom respectively, the equal cloth layer of second layer water conservancy diversion 3 and the equal cloth layer of third layer water conservancy diversion 4, is equipped with second layer guide plate 32 and the third layer guide plate 42 of arranging perpendicularly on the equal cloth layer of second layer water conservancy diversion 3 and the equal cloth layer of third layer water conservancy diversion 4 respectively.

The utility model discloses in, as shown in fig. 4, 5, first layer water conservancy diversion all cloth layer 2 is including the first horizontal guide plate 21 and the first vertical guide plate 22 of violently indulging staggered arrangement. The first transverse guide plate 21 takes the middle as a symmetrical center, and the lower ends of the first transverse guide plates 21 at two sides incline to two sides respectively; the first longitudinal baffle 22 uses the middle as a symmetrical center, and the lower ends of the first longitudinal baffles 22 at two sides are respectively inclined to two sides. In this embodiment, the first diversion uniform cloth layer 2 is provided with three first transverse diversion plates 21 and three first longitudinal diversion plates 22, the first transverse diversion plate 21 and the first longitudinal diversion plate 22 at the middle position are vertically arranged, the lower ends of the first transverse diversion plate 21 and the first longitudinal diversion plate 22 at the two sides incline to the outside, a diversion structure with a small upper end opening and a large lower end opening is formed, and the inlet section waste gas is smoothly guided to the two sides.

In the utility model, as shown in fig. 6, 7 and 8, the second layer diversion uniform cloth layer 3 comprises a second layer support rod 31 and a second layer diversion plate 32 supported on the second layer support rod 31. The second layer of baffles 32 are V-shaped structural plates with downward openings. The second layer of guide plates 32 extend along the direction vertical to the second layer of support rods 31; a plurality of second-layer flow guide plates 32 are arranged at intervals in the length direction of the second-layer support rods 31. A plurality of support rods arranged at intervals can be arranged below the second layer of guide plate 32 according to the support requirement. The waste gas drained by the first diversion uniform distribution layer uniformly drains the gas to the lower part along the drainage surface of the second diversion plate 32 through the second diversion uniform distribution layer 3.

In the utility model, as shown in fig. 9, 10, 11 and 12, the third layer diversion uniform cloth layer 4 comprises a third layer support rod 41 and a third layer diversion plate 42 supported on the third layer support rod 41. The third layer of baffles 42 are V-shaped structural plates with downward openings. The third layer of guide plates 42 extend along the direction vertical to the third layer of support rods 41; a plurality of third-layer guide plates 42 are arranged at intervals in the length direction of the third-layer support rod 41. A plurality of support rods arranged at intervals can be arranged below the third layer of guide plates 42 according to the support requirement. Third layer guide plate 42 and second floor guide plate 32 are arranged perpendicularly to carry out the complete equipartition water conservancy diversion with waste gas at the reaction tower entry end, improve denitration efficiency.

The utility model discloses in, as shown in fig. 12, third layer guide plate 42 both sides edge is equipped with edge opening guide plate 43, and the parallel third layer guide plate 42 of edge opening guide plate 43 arranges that edge opening guide plate 43 is the V type structural slab that the opening is decurrent, and V type structural slab upper end is equipped with guide plate opening 44. Through flow monitoring observation, in the entry end below, the area is great, and the gas flow at both sides edge is limited, and the accessible sets up edge opening guide plate 43, snake flow guide plate opening 44 on third layer guide plate 42 promptly to the gas flow of increase edge position realizes the equipartition drainage.

The utility model discloses in, second floor guide plate 32 and third layer guide plate 42 upper end all are equipped with the circular arc chamfer that radius R is 1mm-8mm, improve the drainage effect, are convenient for make the shaping.

The utility model discloses deepening the present cement kiln production line waste gas condition of analysis, add water conservancy diversion equipartition device in SCR reaction tower entry position, change the flow direction of waste gas, make the waste gas concentration who gets into the catalyst tend to evenly, guarantee SCR denitration efficiency.

The utility model belongs to novel dry process cement clinker production line SCR denitration technique reaction tower air current equipartition guiding device. The gaseous homogeneity of SCR reaction tower is an important index of reaction tower design, concerns the long-term stability of denitration efficiency and SCR system operation, sets up at SCR reaction tower entry the utility model discloses water conservancy diversion equipartition device can be effectual with gaseous distributing, makes gaseous even catalyst that passes through to guarantee SCR denitration reaction efficiency.

Set up water conservancy diversion equipartition device at SCR reaction tower entry, mainly include first layer water conservancy diversion equipartition layer 2, the equal cloth layer of second floor water conservancy diversion 3 and the equal cloth layer of third layer water conservancy diversion 4, the three-layer is arranged according to certain interval, the drainage of leading downwards is realized to the first layer, second floor and third layer are respectively to both sides drainage, through the guide plate of equipartition interval arrangement at each layer, the effectual gas of carrying out the drainage distribution, play better gas water conservancy diversion equipartition effect of leading.

In this embodiment, the first layer of water conservancy diversion equipartition board uses 200-.

In this embodiment, the second layer of the air deflector 32 is made of a steel plate with a height of 120-200mm and a thickness of 8-15mm, and is shaped like an inverted V, the span of a single air deflector is 60-80mm, the distance between two air deflectors is 200mm, and the top end of the air deflector is an arc chamfer with a radius of 1-8 mm.

In the embodiment, the third layer of the guide plate 42 is made of a steel plate with the height of 120-200mm and the thickness of 8-15mm, the shape of the guide plate is similar to an inverted V shape, the span of a single guide plate is 60-80mm, the distance between two guide plates is 100-200mm, and the top end of the guide plate is an arc chamfer with the radius of 1-8 mm; two ends of the whole third layer are provided with 3-4 rows of inverted V-shaped guide plates with openings, namely edge opening guide plates 43, and the width of the guide plate openings 44 is 4-12 mm. After passing through the three-layer flow guide uniform distribution device, waste gas can uniformly pass through the catalyst, and the good denitration efficiency of the SCR is ensured.

The utility model discloses SCR denitration reaction tower equipartition water conservancy diversion system, simple structure arranges rationally, can effectually distribute gaseous, makes gaseous even catalyst that passes through, improves SCR denitration reaction efficiency, has stronger practicality and better application prospect.

The present invention has been described above with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and various insubstantial improvements or direct applications to other applications can be achieved by using the method and technical solution of the present invention, which all fall within the protection scope of the present invention.

Claims

SCR denitration reaction tower equipartition diversion system, its characterized in that: be equipped with multilayer water conservancy diversion layer at the entry end of reaction tower, the water conservancy diversion layer is the equal cloth layer of first layer water conservancy diversion respectively from top to bottom, and the equal cloth layer of second floor water conservancy diversion and the equal cloth layer of third layer water conservancy diversion are equipped with second floor guide plate and the third layer guide plate of vertical arrangement respectively on the equal cloth layer of second floor water conservancy diversion and the equal cloth layer of third layer water conservancy diversion.
2. The uniformly distributed flow guide system of the SCR denitration reaction tower as recited in claim 1, wherein: the first layer of flow guide uniform distribution layer comprises first transverse flow guide plates and first longitudinal flow guide plates which are arranged in a transverse-longitudinal staggered mode.
3. The uniformly distributed flow guide system of the SCR denitration reaction tower as recited in claim 2, wherein: the middle of the first transverse guide plate is taken as a symmetrical center, and the lower ends of the first transverse guide plates at two sides incline to two sides respectively; the first longitudinal guide plate takes the middle as a symmetrical center, and the lower ends of the first longitudinal guide plates on two sides incline to two sides respectively.
4. The uniformly distributed flow guide system of the SCR denitration reaction tower as recited in claim 1, wherein: the second layer of flow guide uniform cloth layer comprises a second layer of supporting rods and a second layer of flow guide plate supported on the second layer of supporting rods.
5. The uniformly distributed flow guide system of the SCR denitration reaction tower as recited in claim 4, wherein: the second layer of guide plates are V-shaped structural plates with downward openings.
6. The uniformly distributed flow guide system of the SCR denitration reaction tower as recited in claim 5, wherein: the second layer of guide plates extend along the direction vertical to the second layer of support rods; and a plurality of second-layer guide plates which are arranged at intervals are arranged in the length direction of the second-layer support rod.
7. The uniformly distributed flow guide system of the SCR denitration reaction tower as recited in any one of claims 1 to 6, characterized in that: the third layer of flow guide uniform cloth layer comprises a third layer of support rod and a third layer of flow guide plate supported on the third layer of support rod.
8. The uniformly distributed flow guide system of the SCR denitration reaction tower as recited in claim 7, wherein: the third layer of guide plate is a V-shaped structural plate with a downward opening.
9. The uniformly distributed flow guide system of the SCR denitration reaction tower of claim 8, which is characterized in that: the third layer of guide plate extends along the direction vertical to the third layer of support rod; and a plurality of third-layer guide plates are arranged at intervals in the length direction of the third-layer support rod.
10. The uniformly distributed flow guide system of the SCR denitration reaction tower as recited in claim 9, wherein: the edge of the two sides of the third layer of guide plate is provided with an edge opening guide plate, the edge opening guide plate is parallel to the third layer of guide plate, the edge opening guide plate is a V-shaped structural plate with a downward opening, and the upper end of the V-shaped structural plate is provided with a guide plate opening.