CN215539827U

CN215539827U - Flue gas denitration device

Info

Publication number: CN215539827U
Application number: CN202121737750.9U
Authority: CN
Inventors: 吴黎杰; 卓盈凯; 倪伟人
Original assignee: Huzhou Nantaihu Environmental Protection Energy Co ltd
Current assignee: Huzhou Nantaihu Environmental Protection Energy Co ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2022-01-18
Anticipated expiration: 2031-07-28

Abstract

The utility model discloses a flue gas denitration device, which comprises a plurality of V-shaped airflow guide plates, an ammonia spraying and mixing device and a denitration reactor, wherein the V-shaped airflow guide plates are arranged in a flue along the flow direction of flue gas; spout ammonia mixing arrangement and including spouting the ammonia house steward, spout and be equipped with a plurality of branch pipes on the ammonia house steward, the branch pipe is connected with the annular duct through the connecting pipe, is equipped with a plurality of shower nozzles along the circumferencial direction on the annular duct, still rotates on the connecting pipe to be connected with the dwang, fixedly connected with mixing impeller on the dwang, and the shower nozzle slope makes mixing impeller take place to rotate towards mixing impeller blowout ammonia. The utility model has the effects of reducing the escape rate of ammonia gas, enhancing the mixing uniformity and sufficiency of ammonia gas and flue gas and improving the denitration efficiency.

Description

Flue gas denitration device

Technical Field

The utility model relates to a flue gas treatment device, in particular to a flue gas denitration device.

Background

At present, the requirements of China on emission control of nitrogen oxides in coal-fired power stations and metallurgical industry are increasingly strict, the SCR flue gas denitration technology is an efficient and mature technology, and the denitration efficiency can reach more than 90 percent at present, so that a Selective Catalytic Reduction (SCR) method is developed into a mainstream technology for flue gas denitration internationally by the mature technology. In a Selective Catalytic Reduction (SCR) process, an ammonia spraying and mixing system for flue gas denitration is an important component, and the denitration efficiency and the ammonia escape rate are directly influenced by whether ammonia and flue gas can be stably and uniformly mixed, so that the reasonable and efficient organization of an ammonia-flue gas flow field becomes the core of an SCR denitration technology. At present, SCR denitration systems in China are often faced with the phenomena that arrangement space is limited, a vertical flue is short, flue gas airflow distribution in the flue is uneven, ammonia gas and flue gas are mixed unevenly, denitration efficiency is reduced seriously, ammonia escape rate is increased, corrosion of a downstream air preheater cold section of the denitration system is aggravated, and serious dust accumulation of the air preheater is caused. Therefore, the existing denitration system has the problems of uneven ammonia-flue gas mixing, reduced denitration efficiency and increased ammonia escape rate.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a flue gas denitration device. The utility model has the effects of reducing the escape rate of ammonia gas, enhancing the mixing uniformity and sufficiency of ammonia gas and flue gas and improving the denitration efficiency.

The technical scheme of the utility model is as follows: a flue gas denitration device comprises a plurality of V-shaped airflow guide plates, an ammonia spraying mixing device and a denitration reactor, wherein the V-shaped ends of the airflow guide plates face a flue gas inlet, and airflow gaps are formed between the adjacent airflow guide plates; spout ammonia mixing arrangement and including spouting the ammonia house steward, spout and be equipped with a plurality of branch pipes on the ammonia house steward, the branch pipe is connected with the annular duct through the connecting pipe, is equipped with a plurality of shower nozzles along the circumferencial direction on the annular duct, still rotates on the connecting pipe to be connected with the dwang, fixedly connected with mixing impeller on the dwang, and the shower nozzle slope makes mixing impeller take place to rotate towards mixing impeller blowout ammonia.

In the flue gas denitration device, the surface of the airflow guide plate is provided with an activated carbon adsorption layer.

In the flue gas denitration device, a plurality of honeycomb-shaped through holes are formed in the denitration reactor, and a denitration catalyst is arranged in the through holes.

In the flue gas denitration device, the rotating rod is provided with the plurality of mixing impellers along the height direction, and the spray head faces the rotating blade of one of the mixing impellers.

In the flue gas denitration device, the rotating directions of the mixing impellers on the two adjacent rotating rods on the same annular pipe are opposite.

Compared with the prior art, the V-shaped airflow guide plate provided by the utility model not only shunts the flue gas to enable the flue gas to be uniformly diffused and fully contact with the ammonia spraying and mixing device, but also has a blocking effect on the ammonia gas and the smoke dust sprayed from the ammonia spraying and mixing device, and reduces the escape rate of the ammonia gas and the smoke dust; the ammonia that spouts mixing arrangement spun that sets up drives mixing impeller and rotates for the flue gas forms turbulent torrent in spouting ammonia mixing arrangement department, thereby improves the mixed sufficiency and the mixing homogeneity of ammonia and flue gas, improves denitration efficiency.

Therefore, the utility model has the effects of reducing the escape rate of ammonia gas, enhancing the mixing uniformity and sufficiency of ammonia gas and flue gas and improving the denitration efficiency.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of a mixing impeller;

FIG. 3 is a schematic view of the structure of a denitration reactor.

The labels in the figures are: 1. an airflow guide plate; 11. an air flow void; 12. an activated carbon adsorption layer; 2. an ammonia spraying header pipe; 21. a branch pipe; 22. a connecting pipe; 23. an annular tube; 24. a spray head; 25. rotating the rod; 26. a mixing impeller; 27. a rotating blade; 3. a denitration reactor; 31. and a through hole.

Detailed Description

The utility model is further illustrated by the following figures and examples, which are not to be construed as limiting the utility model.

Example (b):

as shown in fig. 1-3, a flue gas denitration device comprises a plurality of V-shaped gas flow guide plates 1 arranged in a flue along a flue gas flowing direction, an ammonia spraying mixing device and a denitration reactor 3, wherein the V-shaped ends of the gas flow guide plates 1 face a flue gas inlet, and gas flow gaps 11 are formed between adjacent gas flow guide plates 1; spout ammonia mixing arrangement and including spouting ammonia house steward 2, spout and be equipped with a plurality of branch pipes 21 on the ammonia house steward 2, branch pipe 21 is connected with annular pipe 23 through connecting pipe 22, is equipped with a plurality of shower nozzles 24 along the circumferencial direction on the annular pipe 23, still rotates on the connecting pipe 22 to be connected with dwang 25, fixedly connected with mixing impeller 26 on the dwang 25, shower nozzle 24 slope makes mixing impeller 26 take place to rotate towards mixing impeller 26 blowout ammonia.

The surface of the airflow guide plate 1 is provided with an activated carbon adsorption layer 12.

A plurality of honeycomb-shaped through holes 31 are formed in the denitration reactor 3, and a denitration catalyst is arranged in the through holes 31.

A plurality of mixing impellers 26 are arranged on the rotating rod 25 along the height direction, and the spray head 24 faces a rotating blade 27 of one of the mixing impellers 26.

The mixing impellers 26 on adjacent rotating shafts 25 on the same annular tube 23 rotate in opposite directions.

The working principle is as follows: the V-shaped airflow guide plate 1 not only shunts the flue gas to enable the flue gas to be uniformly diffused and fully contact with the ammonia spraying mixing device, but also has a blocking effect on ammonia gas and smoke dust sprayed from the ammonia spraying mixing device to reduce the escape rate of the ammonia gas and the smoke dust, and the airflow guide plate 1 is provided with the activated carbon adsorption layer 12, the activated carbon adsorption layer 12 is fully contacted with the flue gas firstly to play a good adsorption effect, reduce the subsequent treatment pressure, reduce the dust deposition and improve the overall treatment effect; the ammonia spraying mixing device sprays ammonia gas to drive the mixing impellers 26 to rotate, the rotating directions of the mixing impellers 26 on the adjacent rotating rods 25 are opposite, and a plurality of forward rotating and reverse rotating vortexes are formed, so that the flue gas forms turbulent flow at the ammonia spraying mixing device, the mixing sufficiency and the mixing uniformity of the ammonia gas and the flue gas are improved, and the denitration efficiency is improved; the denitration reactor 3 that sets up honeycomb-like through-hole 31 inside, further improves denitration reaction effect.

The present invention is not described in detail in the prior art and is not specifically described herein.

Claims

1. The utility model provides a flue gas denitrification facility which characterized in that: the denitration device comprises a plurality of V-shaped airflow guide plates (1) arranged in a flue along the flowing direction of flue gas, an ammonia spraying mixing device and a denitration reactor (3), wherein the V-shaped ends of the airflow guide plates (1) face a flue gas inlet, and airflow gaps (11) are formed between the adjacent airflow guide plates (1); spout ammonia mixing arrangement and including spouting ammonia house steward (2), be equipped with a plurality of branch pipes (21) on spouting ammonia house steward (2), branch pipe (21) are connected with ring pipe (23) through connecting pipe (22), be equipped with a plurality of shower nozzles (24) along circumferencial direction on ring pipe (23), still rotate on connecting pipe (22) and be connected with dwang (25), fixedly connected with mixing impeller (26) are gone up in dwang (25), shower nozzle (24) slope makes mixing impeller (26) take place to rotate towards mixing impeller (26) blowout ammonia.

2. The flue gas denitration device according to claim 1, characterized in that: and an active carbon adsorption layer (12) is arranged on the surface of the airflow guide plate (1).

3. The flue gas denitration device according to claim 1, characterized in that: a plurality of honeycomb-shaped through holes (31) are formed in the denitration reactor (3), and denitration catalysts are arranged in the through holes (31).

4. The flue gas denitration device according to claim 1, characterized in that: a plurality of mixing impellers (26) are arranged on the rotating rod (25) along the height direction, and the spray head (24) faces to a rotating blade (27) of one mixing impeller (26).

5. The flue gas denitration device according to claim 1, characterized in that: the rotating directions of the mixing impellers (26) on two adjacent rotating rods (25) on the same annular pipe (23) are opposite.