CN217367544U

CN217367544U - Unpowered pre-dedusting chamber applied to SCR denitration reactor of chain furnace

Info

Publication number: CN217367544U
Application number: CN202221465919.4U
Authority: CN
Inventors: 姚磊; 贾纪强; 朱广志; 沙金华
Original assignee: Jiangsu Shiqing Environmental Protection Technology Co ltd
Current assignee: Jiangsu Shiqing Environmental Protection Technology Co ltd
Priority date: 2022-06-13
Filing date: 2022-06-13
Publication date: 2022-09-06
Anticipated expiration: 2032-06-13

Abstract

The invention provides an unpowered pre-dedusting chamber applied to an SCR denitration reactor of a chain furnace, wherein the unpowered pre-dedusting chamber comprises a smoke inlet interface, a pre-dedusting chamber body and a smoke outlet interface, the pre-dedusting chamber body comprises a dedusting chamber, an ash bucket, a switch valve and a slag extractor, and an inner cavity of the dedusting chamber is sequentially divided into a gravity settling chamber, an inertial collision chamber and a fine particle capture chamber from front to back; the smoke inlet interface is arranged at the front end of the dust chamber, the smoke outlet interface is arranged at the rear end of the dust chamber, and the rear end of the smoke outlet interface is connected with the SCR denitration reactor; the invention can uniformly distribute the gas flow, so that the flow field distribution of the flue gas entering the SCR reactor is more uniform; the deposition is reduced, and the large-particle fly ash in the flue gas is deposited to an ash bucket of a pre-dust chamber under the action of gravity settling, so that the abrasion phenomenon of the catalyst is reduced, the deposition on the surface of the catalyst is reduced, and the resistance of a system is reduced; the catalyst is protected, unburned carbon particles in the flue gas can be intercepted by the pre-dust removal chamber, and the risk of catalyst combustion is reduced.

Description

Unpowered pre-dedusting chamber applied to SCR denitration reactor of chain furnace

Technical Field

The invention relates to the technical field of flue gas denitration, in particular to an unpowered pre-dedusting chamber applied to an SCR denitration reactor of a chain furnace.

Background

The chain grate boiler is a furnace type combustion equipment widely used in industrial and civil boilers. Along with the stricter and stricter environmental emission requirements, the pollution treatment intensity of enterprises is also increased continuously, and the treatment of the flue gas of the chain grate furnace is also paid more and more attention. Dust and SO contained in the industrial boiler production process ₂ 、NO _x And the smoke of harmful substances causes pollution to the environment. At present, the denitration process of the chain furnace mainly comprises SNCR, SCR and SNCR coupling SCR.

The primary air supplied from the lower part of the fire grate brings coal particles in the bed layer into the hearth, and the coal particles are discharged along with flue gas without sufficient combustion in the hearth, so that the carbon content of fly ash is high, and the problems of slag bonding on the inner wall surface of the furnace and the like easily occur due to light fly ash and strong adhesion; after the fly ash reburning technology is adopted, the thermal type and rapid type NO generation rates in the lower region of the hearth are greatly reduced, and the fuel type NO generation rate is increased; the NO generation rates for all three mechanisms in the upper region of the furnace are increased.

When the SCR denitration process is used in the chain grate furnace, the fly ash in the flue gas of the chain grate furnace has high carbon content, large particle size and high hardness, so that the catalyst is seriously abraded; with unburned carbon particles causing combustion of the catalyst; the fly ash is light and has strong adhesion, and is attached to the surface of the catalyst, so that the catalyst is blocked, and the resistance of the reactor is increased.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a front unpowered pre-dedusting chamber applied to an SCR denitration reactor of a chain-grate furnace.

In order to achieve the purpose, the invention adopts the following technical scheme:

an unpowered pre-dedusting chamber applied to an SCR denitration reactor of a chain furnace is arranged in front of the SCR denitration reactor and comprises a smoke inlet, a pre-dedusting chamber body and a smoke outlet, wherein the pre-dedusting chamber body comprises a dedusting chamber, an ash bucket, a switch valve and a slag extractor, the dedusting chamber is fixed above the ash bucket, and an inner cavity of the dedusting chamber is sequentially divided into a gravity settling chamber, an inertial collision chamber and a fine particle capture chamber from front to back; the smoke inlet is arranged at the front end of the dust chamber, the smoke outlet is arranged at the rear end of the dust chamber, and the rear end of the smoke outlet is connected with the SCR denitration reactor; the lower part of ash bucket is installed the ooff valve, the below installation of ooff valve the slag extractor, the one end of ash discharge pipe is connected to the slag extractor, the other end of ash discharge pipe is connected to the ash storehouse.

Preferably, the clean room is below open-ended box, the ash bucket is toper or infundibulate, the upper end of ash bucket is fixed the lower extreme of clean room, separate into four cavities by first baffle, second baffle and third baffle in the clean room respectively, be first cavity, second cavity, third cavity and fourth cavity respectively, first cavity with the second cavity does gravity settling chamber, the third cavity does inertia collision room, the fourth cavity does the fine particle catches the room, be provided with the collision board in the third cavity, be equipped with the particle trapper in the fourth cavity.

Preferably, the second baffle is fixed in the middle of the dust removal chamber, the length of the second baffle is greater than the lengths of the first baffle and the second baffle, the lower end of the second baffle extends to the middle lower part of the ash bucket, and the distance between every two adjacent baffles is equal.

Preferably, the number of the collision plates is at least three, the collision plates are strip-shaped plates, a plurality of the collision plates are fixed in the third chamber to form a collision labyrinth, and the upper part of the third baffle plate is provided with a first opening.

Preferably, the collision plate is disposed obliquely in the third chamber.

Preferably, the SCR denitration reactor includes a body, an inlet pipe and an outlet pipe, the inlet pipe is disposed at an upper end of the body, the outlet pipe is disposed at a lower end of the body, the inlet pipe and the outlet pipe are disposed along a tangential direction of the body, a rectifying grid and a catalyst layer are sequentially disposed in the body from top to bottom, and at least two catalyst layers are disposed.

Preferably, the smoke inlet interface is connected with the chain furnace through a first expansion joint, the smoke outlet interface is connected with an inlet pipe of the SCR denitration reactor through a second expansion joint, and an outlet pipe of the SCR denitration reactor is connected with the economizer through a third expansion joint.

Preferably, the switch valve is a gate valve, and the slag extractor is a star-shaped slag extractor or a screw conveyor.

Compared with the prior art, the invention has the beneficial effects that: (1) the device is connected to the front end of the SCR reactor, and can uniformly distribute air flow, so that the flow field distribution of flue gas entering the SCR reactor is more uniform; the deposited dust is reduced, and large-particle fly ash in the flue gas is deposited to an ash bucket of a pre-dust chamber under the action of gravity settling, so that the abrasion phenomenon of the catalyst is reduced, the deposited dust on the surface of the catalyst is reduced, and the resistance of a system is reduced; the catalyst is protected, unburned carbon particles in the flue gas can be intercepted by the pre-dust removal chamber, and the risk of catalyst combustion is reduced. (2) The dust removal chamber is divided into four chambers by a first baffle plate, a second baffle plate and a third baffle plate, the four chambers are respectively a first chamber, a second chamber, a third chamber and a fourth chamber, the first chamber and the second chamber are gravity settling chambers, the third chamber is an inertia collision chamber, the fourth chamber is a fine particle catching chamber, the third chamber is internally provided with a collision plate, and the fourth chamber is internally provided with a particle catcher. The gravity settling chamber occupies two cavities, guarantee the large granule dust in the flue gas, sufficient settlement distance has in getting into the gravity settling chamber, guarantee that the large granule dust can fully subside, pile up in the ash bucket, set up the collision board in the third cavity, guarantee that the medium granule in the flue gas can subside under the inertia collision of the collision board in the third cavity, reduce the dust granule in the flue gas, set up the particle trapper in the fourth cavity, this particle trapper diffuses the particle, dam, inertia collision and gravity subside, and the entrapment, thereby purify the particle, can optimize denitration entry flow field and fine particle and catch, flue gas in having avoided the chain furnace directly gets into in the SCR denitration reactor, take place the phenomenon of the wearing and tearing of granule flying dust to the catalyst. (3) The collision board is fixed constitute the collision maze in the third chamber, the upper portion of third baffle has first opening, constitutes the maze through a plurality of collision boards for the flue gas is in the third chamber with the collision board inertia collision, thereby further subsides the dust particle that contains in the flue gas, reduces the particle volume in the flue gas, and the flue gas after the third chamber subsides can enter into the fourth chamber through first opening, carries out air distribution and fine particle and catches in the fine particle catching chamber promptly. The collision plate is arranged in the third chamber in an inclined manner, so that the particles can fall off from the upper surface of the collision plate when the particles are impacted to fall into the collision plate on the lower side. When the collision plate is used for a long time, the dust on the upper surface of the collision plate can not slide off, dead angles exist, and the upper surface area of the collision plate is seriously dusted.

Drawings

FIG. 1 is a schematic structural diagram of an unpowered pre-dedusting chamber applied to an SCR denitration reactor of a chain grate furnace according to the present invention;

FIG. 2 is a process flow diagram for treating flue gas using the present invention.

Detailed Description

In order to further understand the objects, structures, features, and functions of the present invention, the following embodiments are described in detail.

As shown in fig. 1, an unpowered pre-dedusting chamber applied to a chain furnace SCR denitration reactor is arranged in front of an SCR denitration reactor 400, and comprises a smoke inlet 100, a pre-dedusting chamber body 200 and a smoke outlet 300, wherein the pre-dedusting chamber body 200 comprises a dedusting chamber 210, an ash bucket 220, a switch valve 230 and a slag extractor 240, the dedusting chamber 210 is fixed above the ash bucket 220, and an inner cavity of the dedusting chamber 210 is sequentially divided into a gravity settling chamber 201, an inertial collision chamber 202 and a fine particle capture chamber 203 from front to back; the smoke inlet 100 is arranged at the front end of the dust chamber 210, the smoke outlet 300 is arranged at the rear end of the dust chamber 210, and the rear end of the smoke outlet 300 is connected with the SCR denitration reactor 400; the lower part of the ash bucket 220 is provided with the switch valve 230, the slag extractor 240 is arranged below the switch valve 230, the slag extractor 240 is connected with one end of an ash discharge pipe 250, and the other end of the ash discharge pipe 250 is connected to the ash bin 500. The switch valve 230 is a gate valve, so that the on-off of the gate valve 230 can be conveniently controlled, the slag extractor 240 is a star-shaped slag extractor or a screw conveyor, when the accumulated ash in the ash bucket needs to be removed, the gate valve 230 is opened, the accumulated ash in the ash bucket 220 is discharged out of the ash bucket through the star-shaped slag extractor or the screw conveyor and conveyed to the ash bin 500, and after the accumulated ash is removed, the switch valve 230 and the slag extractor 240 are closed.

The smoke inlet interface 100 is connected with the chain furnace, smoke from the chain furnace enters the dust chamber 210 from the smoke inlet interface 100, large-particle fly ash in the smoke is settled in the ash hopper before entering the SCR denitration reactor 400 through gravity settling, collision and inertia effects, accumulated ash is discharged to the ash residue bin 500 through the slag extractor 240, the rear end of the smoke outlet interface 300 is connected with the SCR denitration reactor 400, the accumulated ash of the smoke directly entering the SCR denitration reactor 400 is reduced, the large-particle fly ash in the smoke is settled to the ash hopper 220 of the pre-dust chamber through gravity settling, the abrasion phenomenon of a catalyst is reduced, the surface accumulated ash of the catalyst is reduced, and the resistance of a system is reduced; the catalyst is protected, and unburned carbon particles in the flue gas can be intercepted by the pre-dedusting chamber body 200, so that the risk of catalyst combustion is reduced.

Dust removal chamber 210 is below open-ended box, ash bucket 220 is toper or infundibulate, ash bucket 220's upper end is fixed dust removal chamber 210's lower extreme, separate into four cavities by first baffle 211, second baffle 212 and third baffle 213 respectively in the dust removal chamber 210, be first cavity, second cavity, third cavity 203 and fourth cavity 204 respectively, first cavity with the second cavity does gravity settling chamber 201, the third cavity does inertia collision room 202, the fourth cavity does fine particle catches room 203, be provided with collision plate 214 in the third cavity 203, be equipped with particle trapper 215 in the fourth cavity 203. The particle catcher 215 can be installed at the connection of the smoke outlet and the dust chamber, the gravity settling chamber 201 occupies two chambers, ensures large particle dust in the smoke, the gravity settling chamber 201 is provided with enough settling distance to ensure that large particle dust can be fully settled and accumulated in the dust hopper 220, the third chamber 202 is provided with the collision plate 214 to ensure that medium particle in the flue gas can be settled under the inertial collision of the collision plate in the third chamber 202 to reduce the dust particle in the flue gas, the fourth chamber 203 is provided with the particle catcher 215, the particle trap 215 diffuses, intercepts, inerts, and gravity settles the particles, and traps, thereby purifying particles, optimizing a denitration inlet flow field and capturing fine particles, and avoiding the phenomenon that the flue gas in the chain furnace directly enters the SCR denitration reactor to cause abrasion of particle fly ash to the catalyst.

The second baffle 212 is fixed in the middle of the dust removing chamber 210, the length of the second baffle 212 is greater than the lengths of the first baffle 211 and the second baffle 213, the lower end of the second baffle 212 extends to the middle lower part of the ash bucket 220, and the distance between two adjacent baffles is equal. When the dust collector is used, particle fly ash in smoke entering through the smoke inlet interface can impact the first baffle 211 and the second baffle 212 under the inertia effect in the gravity settling chamber, particles are settled and accumulated in the ash hopper 220, and the smoke is impacted by the first baffle 211 and the second baffle 212, so that the speed of the smoke is reduced, and particles in the smoke are more easily settled; the lower end of the second baffle 212 extends to the middle lower part of the ash bucket 220, and when the flue gas enters the third chamber through the lower end of the second baffle 220, the flue gas carries out limited large-particle dust and can be settled in the ash bucket 220, so that the quantity of the large-particle dust escaping to the inertia collision chamber 202 or the fine particle capture chamber 203 is reduced.

At least three collision plates 214 are provided, the collision plates 214 are strip-shaped plates, a plurality of collision plates 214 are fixed in the third chamber 202 to form a collision labyrinth, and a first opening 216 is formed in the upper portion of the third baffle 213. The plurality of collision plates 214 form a labyrinth, so that the dust particles are subjected to inertial collision with the collision plates 214 in the third chamber 202, thereby further settling the dust particles in the flue gas, reducing the amount of the particles in the flue gas, and the flue gas settled in the third chamber 202 can enter the fourth chamber 203 through the first opening 216, that is, the fine particle capture chamber is used for air distribution and fine particle capture.

As shown in fig. 1, the collision plate 214 is disposed obliquely in the third chamber 202. Each collision plate 214 does not contact with each other, and when the collision plate 214 is fixed to the second baffle plate 212 and the third baffle plate 213, the collision plate 214 is inclined downward from the junction with the second baffle plate 212 or the third baffle plate 213, and the collision plate 214 is inclined to ensure that particles can slide down from the upper surface of the collision plate 214 when the particles are caused to fall down to the collision plate 214 on the lower side by inertia. The problem that dust on the upper surface of the collision plate 214 cannot slide off and has dead corners when the collision plate is used for a long time is avoided, so that the upper surface of the collision plate 214 is seriously dusted.

The SCR denitration reactor 400 includes a body 410, an inlet pipe 420 and an outlet pipe 430, the inlet pipe 420 is disposed at the upper end of the body 410, the outlet pipe 430 is disposed at the lower end of the body 410, the inlet pipe 420 and the outlet pipe 430 are disposed along the tangential direction of the body 410, so that flue gas can enter or be discharged from the body 410 from the tangential direction of the body 410 conveniently, a rectifying grid 411 and a catalyst layer 412 are sequentially disposed in the body 410 from top to bottom, and at least two catalyst layers 412 are disposed. After the flue gas enters the SCR denitration reactor, the flue gas moves from top to bottom, so that the flue gas is uniformly dispersed by the rectification grid 411 and then contacts the catalyst layer 412, thereby realizing sufficient catalysis of the flue gas and improving the denitration catalysis efficiency of the SCR denitration reactor 400.

The smoke inlet port 100 is connected with the conveyor furnace through a first expansion joint 110, the smoke outlet port 300 is connected with an inlet pipe 420 of the SCR denitration reactor through a second expansion joint 310, and an outlet pipe 430 of the SCR denitration reactor is connected with an economizer through a third expansion joint 431. The connection between the devices is firm, and the expansion joint can effectively compensate the axial deformation.

As shown in fig. 2, the process of flue gas treatment by using the invention comprises the following steps: the flue gas of the chain grate furnace is settled in an ash bucket before entering an SCR denitration reactor through a pre-dust chamber of the invention under the action of gravity settling, collision and inertia, the flue gas treated by the pre-dust chamber enters the SCR denitration reactor for catalytic denitration, and then is treated by an economizer and an air preheater and then is discharged by a draft fan through a chimney.

The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.

Claims

1. The utility model provides a be applied to unpowered dust chamber in advance of chain grate furnace SCR denitration reactor which characterized in that: the device comprises an unpowered pre-dedusting chamber, a gas inlet connector, a pre-dedusting chamber body and a gas outlet connector, wherein the unpowered pre-dedusting chamber is arranged in front of an SCR denitration reactor and comprises a dedusting chamber, an ash bucket, a switch valve and a slag extractor; the smoke inlet is arranged at the front end of the dust chamber, the smoke outlet is arranged at the rear end of the dust chamber, and the rear end of the smoke outlet is connected with the SCR denitration reactor; the lower part of ash bucket is installed the ooff valve, the below installation of ooff valve the slag extractor, the one end of ash discharge pipe is connected to the slag extractor, the other end of ash discharge pipe is connected to the ash storehouse.

2. The unpowered pre-dedusting chamber applied to the SCR denitration reactor of the chain grate furnace as set forth in claim 1, wherein: the clean room is below open-ended box, the ash bucket is toper or infundibulate, the upper end of ash bucket is fixed the lower extreme of clean room, separate into four cavities by first baffle, second baffle and third baffle respectively in the clean room, be first cavity, second cavity, third cavity and fourth cavity respectively, first cavity with the second cavity does gravity settling chamber, the third cavity does inertia collision room, the fourth cavity does the fine particle catches the room, be provided with the collision board in the third cavity, be equipped with the particle trapper in the fourth cavity.

3. The unpowered pre-dedusting chamber applied to the chain grate furnace SCR denitration reactor as set forth in claim 2, wherein: the second baffle is fixed in the middle of the dust removal chamber, the length of the second baffle is larger than that of the first baffle and that of the second baffle, the lower end of the second baffle extends to the middle lower part of the ash bucket, and the distance between every two adjacent baffles is equal.

4. The unpowered pre-dedusting chamber applied to the chain grate furnace SCR denitration reactor as set forth in claim 2, wherein: the number of the collision plates is at least three, the collision plates are strip-shaped plates, the collision plates are fixed in the third chamber to form a collision labyrinth, and the upper part of the third baffle plate is provided with a first opening.

5. The unpowered pre-dedusting chamber applied to the SCR denitration reactor of the chain grate furnace as set forth in claim 4, wherein: the collision plate is disposed obliquely in the third chamber.

6. The unpowered pre-dedusting chamber applied to the SCR denitration reactor of the chain grate furnace as set forth in claim 1, wherein: the SCR denitration reactor comprises a body, an inlet pipe and an outlet pipe, wherein the inlet pipe is arranged at the upper end of the body, the outlet pipe is arranged at the lower end of the body, the inlet pipe and the outlet pipe are arranged along the tangential direction of the body, a rectifying grid and a catalyst layer are sequentially arranged in the body from top to bottom, and at least two catalyst layers are arranged.

7. The unpowered pre-dedusting chamber applied to the SCR denitration reactor of the chain grate furnace as set forth in claim 6, wherein: the smoke inlet interface is connected with the chain furnace through a first expansion joint, the smoke outlet interface is connected with an inlet pipe of the SCR denitration reactor through a second expansion joint, and an outlet pipe of the SCR denitration reactor is connected with the economizer through a third expansion joint.

8. The unpowered pre-dedusting chamber applied to a chain grate furnace SCR denitration reactor as set forth in claim 1, wherein: the switch valve is a gate valve, and the slag extractor is a star-shaped slag extractor or a screw conveyor.