CN212998852U

CN212998852U - Device for pre-removing coarse particle ash in front of SCR (Selective catalytic reduction) denitration device

Info

Publication number: CN212998852U
Application number: CN202021668189.9U
Authority: CN
Inventors: 王晓冰; 罗志; 牛国平; 周梦伟; 杨晓刚; 张广才; 常磊; 潘栋; 安振; 尚桐; 姚皓
Original assignee: Xian Xire Boiler Environmental Protection Engineering Co Ltd
Current assignee: Xian Xire Boiler Environmental Protection Engineering Co Ltd
Priority date: 2020-08-11
Filing date: 2020-08-11
Publication date: 2021-04-20
Anticipated expiration: 2030-08-11

Abstract

The utility model discloses a device for pre-removing coarse particle ash in front of an SCR (selective catalytic reduction) denitration device, which comprises an economizer outlet flue, an economizer ash hopper, a plurality of baffle plates, a plurality of ash collecting hoppers and a plurality of ash dropping pipes; the top of the economizer outlet flue is provided with a flue gas inlet, the baffle plates are sequentially distributed in the economizer outlet flue, the baffle plate on the outermost side is fixed on the outer wall of the economizer outlet flue, the baffle plate on the outermost side is obliquely distributed, the other baffle plates are in a herringbone structure, gaps are reserved between the adjacent baffle plates, one gap corresponds to one ash collecting hopper and one ash dropping pipe, the ash collecting hopper is positioned below the corresponding gap, the bottom outlet of the ash collecting hopper is communicated with the upper end of the corresponding ash dropping pipe, and the lower end of each ash dropping pipe penetrates through the side wall of the economizer outlet flue and is inserted into the ash collecting hopper.

Description

Device for pre-removing coarse particle ash in front of SCR (Selective catalytic reduction) denitration device

Technical Field

The utility model belongs to the dust removal field relates to a device of pre-removing coarse grain ash before SCR denitrification facility.

Background

Due to the coal quality and the combustion system, more coal-fired boilers appear on the spot with coarse dust particles. Ash particles having a particle size of more than 200 μm are present in a large proportion, and particles having a particle size of up to 1000-2000 μm are also present. These particles will cause more severe attrition of the subsequent flue and catalyst. Conventional economizer flue and ash hopper designs can only collect about 5% of the total ash, and the vast majority of the ash will still enter the subsequent flues and equipment.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a device that removes coarse grain ash in advance before SCR denitrification facility, the device can effectively improve the collection grey effect of economizer flue.

In order to achieve the purpose, the device for pre-removing coarse particle ash in front of the SCR denitration device comprises a coal economizer outlet flue, a coal economizer ash hopper, a plurality of baffle plates, a plurality of ash collecting hoppers and a plurality of ash dropping pipes;

the top of the economizer outlet flue is a flue gas inlet, the baffle plates are sequentially distributed in the economizer outlet flue, the baffle plate on the outermost side is fixed on the outer wall of the economizer outlet flue, the baffle plate on the outermost side is obliquely distributed, the rest baffle plates are in a herringbone or other structures capable of gathering and guiding dust to the dust collecting hopper, gaps are reserved between the adjacent baffle plates, one gap corresponds to one dust collecting hopper and one dust falling pipe, the dust collecting hopper is positioned below the corresponding gap, the bottom outlet of the dust collecting hopper is communicated with the upper end of the corresponding dust falling pipe, and the lower end of each dust falling pipe penetrates through the side wall of the economizer outlet flue and is inserted into the economizer dust hopper.

The bottom outlet of the economizer ash bucket is communicated with an economizer ash bucket ash conveying device.

The utility model discloses following beneficial effect has:

SCR denitrification facility before remove device of coarse grain ash in advance when concrete operation, economizer export high temperature flue gas gets into economizer export flue from the top down, when through the baffling board, flue gas and dust change original vertical decurrent flow orbit, because the density of dust and flue gas is different, the surface of baffling board is enriched and pressed close to gradually to the dust, and get into in the collection ash bucket under the effect of inertia force, flue gas turns to and enters into in the horizontal flue of economizer export along economizer export flue simultaneously, wherein, the flue gas truns into the horizontal direction by vertical direction, be favorable to the ash to pass through inertia force separation to the collection ash bucket in, in order to deviate from most coarse grain ash in advance, when ash removal efficiency is high, can utilize original ash bucket and defeated ash system, or only dilatation on this basis, reducible investment.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Wherein, 1 is an exit flue of the coal economizer, 2 is a baffle plate, 3 is an ash collecting hopper, 4 is an ash dropping pipe, 5 is an ash hopper of the coal economizer, and 6 is an ash conveying device of the ash hopper of the coal economizer.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings:

referring to fig. 1, the device for pre-removing coarse particle ash in front of the SCR denitration device of the present invention includes an economizer outlet flue 1, an economizer ash hopper 5, a plurality of baffle plates 2, a plurality of ash collecting hoppers 3, and a plurality of ash dropping pipes 4; the top of the coal economizer outlet flue 1 is provided with a flue gas inlet, the baffle plates 2 are sequentially distributed in the coal economizer outlet flue 1, the baffle plate 2 on the outermost side is fixed on the outer wall of the coal economizer outlet flue 1, the baffle plate 2 on the outermost side is obliquely distributed, the rest baffle plates 2 are in a herringbone structure, gaps exist between the adjacent baffle plates 2, one gap corresponds to one ash collecting hopper 3 and one ash dropping pipe 4, the ash collecting hopper 3 is positioned below the corresponding gap, the bottom outlet of the ash collecting hopper 3 is communicated with the upper end of the corresponding ash dropping pipe 4, and the lower end of each ash dropping pipe 4 penetrates through the side wall of the coal economizer outlet flue 1 to be inserted into the ash hopper 5 of the coal economizer or penetrates out of the inner wall of the flue to directly enter the ash conveying device 6. The bottom outlet of the economizer ash hopper 5 is communicated with an economizer ash hopper ash conveying device 6.

The utility model discloses a concrete working process does:

the high-temperature flue gas at the outlet of the coal economizer enters the flue 1 at the outlet of the coal economizer from top to bottom, when the high-temperature flue gas passes through the baffle plate 2, the flue gas and the dust change the original vertical downward flow trajectory, the dust is gradually enriched and close to the surface of the baffle plate 2 due to the different densities of the dust and the flue gas, when the dust continues to flow downward, the dust enters the ash collecting hopper 3 due to the action of inertia force, the flue gas turns and enters the horizontal flue at the outlet of the coal economizer along the flue 1 at the outlet of the coal economizer, the dust enters the ash collecting hopper 3 and then enters the ash falling pipe 4 under the action of gravity, and then enters the ash hopper 5 of the coal economizer, or directly passes through the wall surface of the ash hopper and enters the ash conveying system 6.

The utility model discloses utilize SCR entry flue, generally be spaces such as economizer export flue 1 and ash bucket, remove coarse grain ash device in advance through reforming transform flue structure, additional installation to most coarse grain ash of desorption. Research shows that the utility model has a removal rate of ash with a particle size of more than 200 mu m of 40-80%, can obviously reduce the abrasion of a subsequent flue and a catalyst, and the coal economizer outlet flue 1 has the characteristics that: the section of the flue is large, the flow velocity of the flue gas is as low as 3-5m/s, and the resistance generated by additionally arranging a pre-ash removal device is generally less than 100 Pa; the flue gas turns into the horizontal direction from vertical direction, is favorable to the ash to pass through inertial force separation to the ash collecting hopper 3 in, and the ash removal is efficient simultaneously, can utilize old original ash hopper and defeated ash system, reduces the investment.

Claims

1. A device for pre-removing coarse particle ash in front of an SCR (selective catalytic reduction) denitration device is characterized by comprising a coal economizer outlet flue (1), a coal economizer ash hopper (5), a plurality of baffle plates (2), a plurality of ash collecting hoppers (3) and a plurality of ash dropping pipes (4);

the top of the economizer outlet flue (1) is a flue gas inlet, the baffle plates (2) are sequentially distributed in the economizer outlet flue (1), the baffle plates (2) on the outermost side are fixed on the outer wall of the economizer outlet flue (1), the baffle plates (2) on the outermost side are distributed in an inclined mode, the rest baffle plates (2) are in a herringbone structure, gaps exist between the adjacent baffle plates (2), one gap corresponds to one ash collecting hopper (3) and one ash dropping pipe (4), the ash collecting hopper (3) is located below the corresponding gap, the bottom outlet of the ash collecting hopper (3) is communicated with the upper end of the corresponding ash dropping pipe (4), and the lower end of each ash dropping pipe (4) penetrates through the side wall of the economizer outlet flue (1) and is inserted into the economizer ash dropping hopper (5).

2. The device for pre-removing the coarse particle ash in front of the SCR denitration device according to claim 1, wherein the bottom outlet of the economizer ash hopper (5) is communicated with an economizer ash hopper ash conveying device (6).

3. The device for pre-removing coarse particle ash in front of the SCR denitration device according to claim 1, characterized in that the baffle plate (2) can concentrate and guide dust into the ash collecting hopper (3), and the flue gas passes through the gap of the baffle plate (2) and then is continuously introduced into the subsequent flue.