CN201108807Y - Horizontal SCR denitrification reaction device - Google Patents

Abstract

The utility model discloses a horizontal SCR denitration reaction device, which comprises an ammonia injection grid (1), a flue gas mixer (2), a denitration reactor (3), an air preheater (4), and a dust collector (5 ), one end of the denitrification reactor (3) is connected to the flue gas inlet pipe (8), the flue gas inlet pipe (8) is equipped with a mixer (2), and the front end of the mixer (2) is provided with an ammonia spray grid (1) , the other end of the denitration reactor (3) is connected to the dust collector (5) through the flue gas output pipe (9), and an air preheater (4) is arranged between the dust collector (5) and the denitration reactor (3), wherein A cyclone separator (6) is arranged at the front end of the ammonia injection grid (1), and the center line of the denitrification reactor (3) is parallel to the horizontal line. The height and diameter of the utility model are greatly reduced, the supporting structure can be reduced, the length of the connecting flue is shortened, the equipment cost is reduced, the system layout is smooth, the smoke flow field is evenly distributed, and equipment such as deflectors and rectifying plates can be omitted.

Description

Horizontal SCR denitrification reaction device

technical field

The utility model belongs to the field of flue gas denitration equipment, in particular to a horizontal SCR denitration reaction device.

Background technique

For the SCR denitration reaction device, the flow field distribution of the system (including temperature distribution, distribution of ammonia and nitrogen oxides, flow velocity distribution, etc.) and ash accumulation (severe ash accumulation will cause blockage and increase the pressure loss of equipment) , affecting flue gas flow) will directly affect the denitrification efficiency.

At present, the SCR denitration reaction system is usually placed after the boiler economizer and before the dust collector. The layout of the SCR denitration reactor is mostly vertical. As shown in Figure 2, there is a catalyst layer 7 arranged horizontally in the SCR denitration reactor 3. A rectifying plate 11 is arranged above the catalyst layer 7, and a cyclone separator, an ammonia injection grid 1, a flue gas mixer 2, and a deflector 10 are sequentially arranged on the flue gas input pipe 8 of the SCR denitrification reactor 3 from left to right , the denitration reactor 3 is connected to the dust remover 5 through the flue gas output pipe 9, an air preheater 4 is arranged between the dust remover 5 and the denitration reactor 3, and the purpose of the vertical arrangement of the denitration reactor is mainly to reduce dust Blockage due to the high dust content of the flue gas. The height of the vertical denitrification reaction tower is generally more than ten meters. Due to its relatively high height, it will cause complex supporting structures and a lot of equipment consumables, and due to the relatively high height, it will also cause the connecting flue between the economizer and the SCR reactor. Long, with many bends, serious dust accumulation, increased system resistance, and uneven distribution of smoke. Therefore, the vertical SCR reaction device has problems such as long flue connection, large system resistance, complex support structure, uneven flow field distribution, and large space occupation.

Utility model content

The utility model provides a horizontal SCR denitrification reaction device, which solves the problems of dust accumulation and uneven distribution of flue gas flow in the SCR denitrification reaction.

The technical scheme of the utility model is as follows: a horizontal SCR denitrification reaction device, including an ammonia spray grid, a flue gas mixer, a denitration reactor, an air preheater, and a dust collector, and one end of the denitrification reactor is connected to a flue gas connection The flue gas inlet pipe is provided with a mixer, and the front end of the mixer is provided with an ammonia spray grid. The other end of the denitrification reactor is connected to the dust collector through the flue gas output pipe. There is an air preheater between them, the key point of which is that the front end of the ammonia injection grid is provided with a cyclone separator, and the center line of the denitrification reactor is parallel to the horizontal line. Catalyst layers are vertically arranged in the denitration reactor. After the flue gas comes out of the economizer, the large particles in the flue gas are removed by the cyclone separator, and then mixed with the ammonia gas sprayed from the ammonia injection grid through the mixer, and then enters the denitrification reactor. In the reactor, the flue gas Nitrogen oxides (NOX) react with ammonia under the action of a catalyst to generate N2 and H2O, thereby removing NOX, and the purified flue gas enters the air preheater for heat exchange, and the flue gas temperature drops from 370°C to 150°C ℃, and then enter the dust collector for dust removal. The horizontal SCR denitrification device can reduce connecting flue, reduce dust accumulation, reduce system resistance, save diversion facilities, distribute flow evenly in the flow field, and reduce system cost and operating cost.

The utility model advantage:

(1) The number of curves is reduced, the phenomenon of flue gas ash accumulation is reduced, and the pressure loss of the system is reduced; and the air flow is evenly distributed;

(2) The main functional units are directly connected, the length of the flue connection is shortened, and the equipment cost is reduced;

(3) The system layout is smooth, and equipment such as deflectors and rectifiers can be omitted;

(4) The height and diameter of the horizontal denitrification device are greatly reduced, which can reduce the supporting structure and reduce the equipment cost.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Figure 2 is a schematic diagram of the structure before improvement.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

As shown in Figure 1, the utility model horizontal SCR denitration reaction device is composed of an ammonia injection grid 1, a mixer 2, a denitration reactor 3, an air preheater 4, and a dust collector 5. One end of the denitration reactor 3 Connect the flue gas inlet pipe 8, the flue gas inlet pipe 8 is equipped with a mixer 2, the front end of the mixer 2 is provided with an ammonia injection grid 1, and the other end of the denitrification reactor 3 is connected to the flue gas output pipe 9 Dust remover 5, an air preheater 4 is arranged between the dust remover 5 and the denitrification reactor 3, wherein the front end of the ammonia spray grid 1 is provided with a cyclone separator 6, and the centerline of the denitrification reactor 3 is parallel to the horizontal line . A catalyst layer 7 is vertically arranged in the denitration reactor 3 .

Working principle: The flue gas produced by the boiler is drawn from the economizer through the flue gas inlet pipe 8 and enters the cyclone separator 6 to remove large particles in the flue gas, and then passes through the mixer with the ammonia gas ejected from the ammonia injection grid 1 2 are mixed and enter the denitrification reactor 3. In the reactor, nitrogen oxides (NOX) in the flue gas react with ammonia gas under the action of a catalyst to generate N ₂ and H ₂ O, remove NO _X , and the purified The flue gas enters the air preheater 4 for heat exchange, and the flue gas temperature drops from 370°C to about 150°C, and then enters the dust collector for dust removal and is discharged.

Claims (2)

1, a kind of horizontal SCR denitration reaction device, comprise ammonia-spraying grid (1), flue gas blender (2), Benitration reactor (3), air preheater (4), deduster (5), described Benitration reactor (3) one ends connect flue gas access tube (8), be provided with blender (2) in this flue gas access tube (8), this blender (2) front end is provided with ammonia-spraying grid (1), described Benitration reactor (3) other end is connected with deduster (5) by flue gas efferent duct (9), between deduster (5) and Benitration reactor (3), be provided with air preheater (4), it is characterized in that: the flue gas access tube (8) in described ammonia-spraying grid (1) the place ahead is provided with cyclone separator (6), and described Benitration reactor (3) center line is parallel with horizontal line.

2, according to the described horizontal SCR denitration reaction of claim 1 device, it is characterized in that: be arranged vertically catalyst layer (7) in the described Benitration reactor (3).

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