CN211025822U

CN211025822U - Denitration reactor with uniformly distributed flue gas

Info

Publication number: CN211025822U
Application number: CN201921643932.2U
Authority: CN
Inventors: 施庆忠
Original assignee: Zhejiang Jiahuan Engineering Technology Co ltd
Current assignee: Zhejiang Jiahuan Engineering Technology Co ltd
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2020-07-17
Anticipated expiration: 2029-09-29

Abstract

The utility model discloses a flue gas evenly distributed's denitration reactor, including reactor body and catalyst layer, this internal flue gas evenly distributed device that is provided with of reactor, flue gas evenly distributed device is formed by the seamless concatenation of the same rectangle nozzle stub of a plurality of size, installs in the below of reactor top gradual change section, and the axial direction of rectangle nozzle stub is perpendicular with the catalyst layer. The utility model discloses simple structure, easy to assemble and high-efficient, easy regulation. Flue gas evenly distributed device guarantees that the flue gas is even in SCR system flow field distribution, makes flue gas and the even abundant contact of catalyst to improve denitration efficiency, can effectively reduce flue gas to the impact and the wearing and tearing of catalyst, the life of extension catalyst has the effect that reduces ammonia escape rate moreover, prevents to follow-up equipment corruption.

Description

Denitration reactor with uniformly distributed flue gas

Technical Field

The utility model relates to a flue gas denitration field, concretely relates to flue gas evenly distributed's denitration reactor.

Background

The flue gas of a thermal power plant contains a large amount of nitrogen oxides, if the flue gas is not treated, the waste gas is discharged into the atmosphere to generate pollution and form acid rain, and in order to further reduce the emission of the nitrogen oxides, the flue gas after combustion needs to be subjected to denitration treatment.

Denitration of flue gas, i.e. the removal of NO produced_XReduction to N₂Thereby removing NO in the smoke_XThe method can be divided into a dry method (selective catalytic reduction flue gas denitration, selective non-catalytic reduction denitration) and a wet method according to treatment processes. Compared with the wet flue gas denitration technology, the dry flue gas denitration technology has the main advantages that: low basic investment, simple equipment and process, high NOx removing efficiency, no wastewater and waste treatment and difficult secondary pollution. Some researchers at home and abroad also develop the method for treating NO by using microorganisms_XA method of exhausting gas.

Due to NO in flue gas discharged from combustion system_XMore than 90% is NO, which is poorly soluble in water and therefore NO_XThe wet treatment of (2) cannot be carried out by a simple washing method. The principle of flue gas denitration is that NO is oxidized into NO by using an oxidant₂Generation of NO₂And absorbing the denitration catalyst by water or an alkaline solution to realize denitration.

The selective catalytic reduction SCR method denitration adopts ammonia, CO or hydrocarbon and the like as reducing agents under the condition of catalyst existence, and reduces NO in flue gas into N under the condition of oxygen existence₂. NH can be used as a reducing agent of the SCR reaction₃、CO、H₂And methane, ethylene, propane, propylene, and the like. The removal efficiency of NO is highest when ammonia is used as the reducing gas. The SCR reaction is a redox reaction and therefore follows either a redox mechanism or a Mars-van Krevelen-type mechanism.

However, in the denitration industry, the phenomenon of uneven distribution of flue gas flow fields in a reactor generally exists, and the service life of the catalyst is reduced due to the impact of the flue gas.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the not enough of prior art, provide a flue gas evenly distributed's denitration reactor.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model discloses a denitration reactor with uniformly distributed flue gas, which comprises a reactor body and a catalyst layer arranged in the reactor body, and is characterized in that a flue gas uniform distribution device is arranged in the reactor body and is positioned at the upstream of the SCR catalyst layer, the flue gas uniform distribution device and the catalyst layer are arranged in the same straight pipe section, and the flue gas uniform distribution device and the catalyst layer are parallel to each other and are all arranged perpendicular to the axis of the straight pipe section; the flue gas uniform distribution device is formed by mutually clinging and seamlessly splicing a plurality of rectangular short pipes with the same size, the flue gas uniform distribution device is arranged below the top gradual change section of the reactor, and the axial direction of the rectangular short pipes is vertical to the catalyst layer.

As the preferred proposal of the utility model, the flue gas evenly distributed device is internally provided with the upper and lower ends of each rectangular short pipe which are all flushed.

As the utility model discloses an optimal scheme, this internal multilayer flue gas evenly distributed device that is provided with of reactor, parallel mount about each flue gas evenly distributed device, and all lie in same straight tube section with the catalyst layer.

The utility model discloses a flue gas evenly distributed device, its simple structure, easy to assemble and high-efficient, easily adjust. The reactor is formed by seamlessly splicing a plurality of rectangular short pipes with the same size, and is arranged below a gradual change section at the top of the reactor and above a first layer of catalyst. In the denitration industry, flue gas enters the SCR reactor from the top through a flue, and due to disturbance of a flue gas flow field, the flue gas and a catalyst cannot be uniformly and sufficiently contacted and impact can be formed on the catalyst, so that the denitration efficiency is reduced, and the service life of the catalyst is prolonged. The cross section of this device is perpendicular with the flow direction of flue gas, and the flue gas of disturbance can tend to steadily behind every rectangle nozzle stub in the device, and the flow field distributes evenly and flow direction is perpendicular with the cross section of catalyst, improves the contact surface of flue gas and catalyst and effectively reduces the flue gas and to the impact and the wearing and tearing of catalyst to improve denitration efficiency and prolong the life of catalyst. This device guarantees that the flue gas is even in SCR system flow field distribution, makes flue gas and the even abundant contact of catalyst to improve denitration efficiency, can effectively reduce flue gas to the impact and the wearing and tearing of catalyst, prolong the life of catalyst, have the effect that reduces ammonia escape rate moreover, prevent to follow-up equipment corruption. Through the implementation of above-mentioned technical scheme, the utility model discloses have that the flue gas distributes evenly, improves denitration efficiency, reduces the flue gas to the impact and the wearing and tearing of catalyst, reduce the effect of ammonia escape rate.

Drawings

Figure 1 is a device schematic diagram for evenly distributed flue gas in denitration reactor.

Figure 2 is the device in the denitration reactor function schematic diagram.

Detailed Description

The invention will be further explained with reference to the drawings and the specific embodiments.

As shown in fig. 1 and 2, the embodiment is a denitration reactor with uniformly distributed flue gas, which includes a reactor body and a catalyst layer disposed in the reactor body, wherein a flue gas uniform distribution device is disposed in the reactor body, the flue gas uniform distribution device is located at the upstream of the SCR catalyst layer, and the flue gas uniform distribution device and the catalyst layer are mounted in the same straight pipe section, and are parallel to each other and perpendicular to the axis of the straight pipe section; the flue gas uniform distribution device is formed by mutually clinging and seamlessly splicing a plurality of rectangular short pipes with the same size, the flue gas uniform distribution device is arranged below the top gradual change section of the reactor, and the axial direction of the rectangular short pipes is vertical to the catalyst layer.

As shown in fig. 2, the upper and lower ends of each rectangular short pipe in the flue gas uniform distribution device are flush so as to facilitate installation and mass production, the upper end face of the flue gas uniform distribution device can also be a convex arc structure, and the lower end face is suggested to be flush.

According to the requirement, a plurality of layers of flue gas uniform distribution devices (if two layers can be arranged) can be arranged in the reactor body, and each flue gas uniform distribution device is arranged in parallel up and down and is positioned in the same straight pipe section with the catalyst layer; the distance between the smoke uniform distribution devices is 1500-2500mm, and the multilayer smoke uniform distribution devices can better restrict the flow direction of smoke.

In this embodiment, the distance between the flue gas uniform distribution device and the catalyst layer is 2000-3000mm, and the length of the rectangular short pipe is 300-500 mm. The section of the rectangular short pipe is square, and the side length of the square is 110-321 mm. The selectable material of the rectangular short pipe is Q345B. The flue gas uniform distribution device is connected and installed with the straight pipe section through a bolt.

Because the cross section of the flue gas uniform distribution device is vertical to the flow direction of the flue gas, disturbed flue gas tends to be stable after passing through each rectangular short tube in the device, the flow field is uniformly distributed, the flow direction is vertical to the cross section of the catalyst, the contact surface of the flue gas and the catalyst is improved, the impact and abrasion of the flue gas on the catalyst are effectively reduced, the denitration efficiency is improved, and the service life of the catalyst is prolonged. This device guarantees that the flue gas is even in SCR system flow field distribution, makes flue gas and the even abundant contact of catalyst to improve denitration efficiency, can effectively reduce flue gas to the impact and the wearing and tearing of catalyst, prolong the life of catalyst, have the effect that reduces ammonia escape rate moreover, prevent to follow-up equipment corruption. Through the implementation of above-mentioned technical scheme, the utility model discloses have that the flue gas distributes evenly, improves denitration efficiency, reduces the flue gas to the impact and the wearing and tearing of catalyst, reduce the effect of ammonia escape rate.

Claims

1. A denitration reactor with uniformly distributed flue gas comprises a reactor body and a catalyst layer arranged in the reactor body, and is characterized in that a flue gas uniform distribution device is arranged in the reactor body, the flue gas uniform distribution device is positioned at the upstream of the catalyst layer, the flue gas uniform distribution device and the catalyst layer are arranged in the same straight pipe section, and the flue gas uniform distribution device and the catalyst layer are parallel to each other and are perpendicular to the axis of the straight pipe section; the flue gas uniform distribution device is formed by mutually clinging and seamlessly splicing a plurality of rectangular short pipes with the same size, the flue gas uniform distribution device is arranged below the top gradual change section of the reactor, and the axial direction of the rectangular short pipes is vertical to the catalyst layer.

2. The denitration reactor with uniformly distributed flue gas as claimed in claim 1, wherein the upper and lower ends of each rectangular short pipe in the flue gas uniform distribution device are flush.

3. The denitration reactor with uniformly distributed flue gas as claimed in claim 1, wherein a plurality of layers of flue gas uniform distribution devices are arranged in the reactor body, and each flue gas uniform distribution device is installed in parallel up and down and is located in the same straight pipe section with the catalyst layer; the distance between the smoke uniform distribution devices is 1500-2500 mm.

4. The denitration reactor with uniformly distributed flue gas as claimed in claim 1, wherein the distance between the flue gas uniform distribution device and the catalyst layer is 2000-3000mm, and the length of the rectangular short tube is 300-500 mm.

5. The denitration reactor with the uniformly distributed flue gas as claimed in claim 1, wherein the section of the rectangular short pipe is square, and the side length of the square is 110 mm-321 mm; the length of the rectangular short pipe is 300 mm-500 mm.

6. The denitration reactor with the flue gas uniformly distributed according to any one of claims 1 to 3, wherein the rectangular short pipe is made of Q345B.

7. The denitration reactor with uniformly distributed flue gas as claimed in claim 1, wherein said uniformly distributed flue gas device is detachably mounted to the straight pipe section.