CN201643983U

CN201643983U - Gas injection grill and flue gas denitration device

Info

Publication number: CN201643983U
Application number: CN2010201297934U
Authority: CN
Inventors: 高原; 王文选; 闵健; 杨秀杰
Original assignee: China Datang Technologies and Engineering Co Ltd
Current assignee: Datang Technology Industry Co ltd; Datang Technology Industry Group Co ltd; Datang Environment Industry Group Co Ltd
Priority date: 2010-02-26
Filing date: 2010-02-26
Publication date: 2010-11-24
Anticipated expiration: 2020-02-26

Abstract

The utility model provides a gas injection grill, which comprises a plurality of parallel gas delivery branch pipes and a plurality of gas injection pipes vertically connected on the plurality of parallel gas delivery branch pipes. The gas injection pipes are distributed in the shape of isosceles triangles. The three vertices of each isosceles triangle correspond to three gas injection pipes on two adjacent gas delivery branch pipes. The two vertices on the bottom side of the isosceles triangle correspond to two adjacent gas injection pipes on one gas delivery branch pipe. The utility model additionally provides a flue gas denitration device which is used for the gas injection grill and is arranged in a flue. Through improving the distribution method of the gas injection pipes, the utility model has the advantages that the even distribution of ammonia/air mixed gas and flue gas in the flue is realized, the ammonia is mixed with the flue gas more fully and the denitration efficiency is improved.

Description

A kind of gas sprays grid and equipment for denitrifying flue gas

Technical field

The utility model belongs to the environmental protection equipment technical field, and particularly a kind of gas sprays grid and equipment for denitrifying flue gas.

Background technology

(Selective Catalytic Reduction, SCR) technology is to use the most ripe at most and effective a kind of gas denitrifying technology at present in the world to selective catalytic reduction.Its technological principle is generally: in the flue gas of uniform temperature, sprays into reducing agents such as ammonia or urea, is mixed with the reactor (SCR Benitration reactor) that the flue gas of reducing agent is flowed through catalyst is housed, and under the effect of catalyst, the NO in reducing agent and the flue gas _xReduction reaction taking place generate harmless nitrogen G﹠W, enter atmosphere with flue gas, removes NO thereby reach _xEffect.Therefore, in the SCR denitration technology, ammonia and flue gas even mix be the influence reaction whether fully, denitration rate and ammonia utilization rate key factor whether up to standard.

Be provided with gas and spray grid in the flue of equipment for denitrifying flue gas, ammonia/air Mixture is sprayed the gas injection tube ejection of grid by gas.At present, the gas injection tube that the gas that uses on the engineering sprays in the grid is generally the rectanglar arrangement mode, and promptly such gas sprays and forms a rectangle or square in the grid between adjacent four gas injection tubes.Though the gas of this arrangement mode sprays the grid simplicity of design, but its gross area that can not realize gaseous mixture on a uniform section sprays, be that the area that gaseous mixture sprays can not be realized maximization, thereby make ammonia be difficult for the homogeneous that in flue, distributes, influenced the denitration efficiency of equipment for denitrifying flue gas to a certain extent.

The utility model content

The purpose of this utility model provides a kind of gas and sprays grid and equipment for denitrifying flue gas, with realization ammonia/air Mixture and the even distribution of flue gas in flue, thus the denitration efficiency of raising equipment for denitrifying flue gas.

For solving the problems of the technologies described above, the utility model provides technical scheme as follows:

A kind of gas sprays grid, comprises that many exhausts body parallel to each other is carried the son pipe and is vertically connected at described many exhausts body to carry many gas injection tubes on the sub-pipe, wherein:

Described many gas injection tubes are isosceles triangle and arrange, the corresponding adjacent two exhaust bodies in 3 summits of each isosceles triangle are carried 3 gas injection tubes on the sub-pipe, wherein, the corresponding exhaust body in 2 summits on the base of described isosceles triangle is carried 2 adjacent gas injection tubes on the sub-pipe.

Above-mentioned gas sprays grid, and wherein, the bottom side length of described isosceles triangle is 0.8～1.25 with the ratio of height.

Above-mentioned gas sprays grid, and wherein, described gas is ammonia/air Mixture.

Above-mentioned gas sprays grid, and wherein, every exhaust body is carried and comprised one or more gas conveying pipe in the sub-pipe.

A kind of equipment for denitrifying flue gas wherein, is provided with above-mentioned gas and sprays grid in the flue of described equipment for denitrifying flue gas.

Compared with prior art, the beneficial effects of the utility model are: by improving the arrangement mode of gas injection tube, realize ammonia/air Mixture and the even distribution of flue gas in flue, make ammonia mix more fully, thereby improve denitration efficiency with flue gas.

Description of drawings

Fig. 1 is the structure chart that gas of the present utility model sprays grid;

Fig. 2 is the vertical view that gas of the present utility model sprays grid.

The specific embodiment

For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with the accompanying drawings and the specific embodiments the utility model is described in detail.

See figures.1.and.2, gas injection grid of the present utility model comprises many exhausts body conveying pipe 2 parallel to each other and the many gas injection tubes 1 that are vertically connected on the sub-pipe 2 of described many exhausts body conveying, wherein, described many gas injection tubes 1 are isosceles triangle and arrange, the corresponding adjacent two exhaust bodies in three summits of each isosceles triangle are carried three gas injection tubes 1 on the son pipe 2, wherein, the corresponding exhaust body in two summits on the base of described isosceles triangle is carried two adjacent gas injection tubes on the sub-pipe.Preferably, the bottom side length W of described isosceles triangle and the ratio of high H are controlled between 0.8～1.25.

When specific implementation, every exhaust body is carried can comprise one or more gas conveying pipe in the sub-pipe, that is, every exhaust body is carried and comprised sub a pipe of sufficiently long gas input in the sub-pipe, perhaps, every exhaust body is carried and is comprised many short gases conveying pipes in the sub-pipe.

Described gas sprays grid and is arranged in the flue of equipment for denitrifying flue gas, wherein, gas is carried son pipe 2 to be connected to gas and is carried female pipe (figure does not show), gas carries female pipe to carry ammonia/air Mixture to carry son pipe 2 to gas, described gaseous mixture is ejected in the flue by described gas injection tube 1 again, mixes in flue with flue gas.

The utility model is arranged by changing traditional rectangular or the square gas injection tube of arranging into isosceles triangle, be to form approximate isosceles triangle between corresponding three gas injection tubes to arrange, like this, the distribution of gas injection tube in flue is more even, thereby help the even distribution of ammonia in flue, some ammonia of having eliminated in rectangle or the square arrangement mode sprays the dead band, simultaneously, use the more traditional arrangement mode of gas injection grid of this arrangement mode only need increase a small amount of gas injection tube, do not bring the remarkable increase of manufacturing cost.

Preferably, can also carry at every gas a valve is set on the sub-pipe, by the gas jet velocity of described valve regulated gas injection tube, make described gas jet velocity approach the velocity of flue gas of relevant position in the described flue, and then make ammonia more even with mixing of flue gas.

Should be noted that at last, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the spiritual scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims

1. a gas sprays grid, comprises that many exhausts body parallel to each other is carried the son pipe and is vertically connected at described many exhausts body to carry many gas injection tubes on the sub-pipe, it is characterized in that:

2. gas as claimed in claim 1 sprays grid, it is characterized in that:

The bottom side length of described isosceles triangle is 0.8～1.25 with the ratio of height.

3. gas as claimed in claim 1 sprays grid, it is characterized in that:

Described gas is ammonia/air Mixture.

4. gas as claimed in claim 1 sprays grid, it is characterized in that:

Every exhaust body is carried and is comprised one or more gas conveying pipe in the sub-pipe.

5. an equipment for denitrifying flue gas is characterized in that, is provided with in the flue of described equipment for denitrifying flue gas as each described gas in the claim 1 to 4 to spray grid.