CN217287860U

CN217287860U - Denitration treatment equipment for casting waste sand regeneration tail gas

Info

Publication number: CN217287860U
Application number: CN202220736712.XU
Authority: CN
Inventors: 戴伟平; 罗桂猛; 刘临琦; 梁炎
Original assignee: Guangxi Lanco Resources Recycling Co ltd
Current assignee: Guangxi Lanco Resources Recycling Co ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2022-08-26
Anticipated expiration: 2032-03-31

Abstract

The utility model discloses denitration treatment equipment for casting waste sand regeneration tail gas, which comprises an external shell and an internal denitration component; the internal denitration assembly comprises a plurality of catalyst support frames, a catalytic plate and a urea solution spraying device, and the catalytic plate and the urea solution spraying device are sequentially and crossly stacked on the catalyst support frames; the urea solution spraying device comprises a rectangular frame and a plurality of spraying pipes connected to the rectangular frame, a plurality of nozzles are uniformly distributed on the spraying pipes, two ends of each spraying pipe are connected with a urea solution shunting pipeline, and the shunting pipelines are connected with a main pipeline; and a through hole for mounting the main pipeline is formed in the outer shell. The utility model discloses catalysis board and urea solution spray set alternately stack on the catalyst support frame in proper order, and spray set sets up a plurality of nozzles, makes catalysis board surface spray completely has urea solution, can make the flue gas at catalyst surface and urea solution contact reaction and the abundant reaction is complete, and the denitration is effectual.

Description

Denitration treatment equipment for casting waste sand regeneration tail gas

Technical Field

The utility model belongs to the technical field of the denitration treatment equipment, especially, relate to a denitration treatment equipment for casting waste sand regeneration tail gas.

Background

Approximately 90% of castings in the foundry industry are produced by sand casting, and steel, iron and most nonferrous alloys are produced by sand casting. The basic raw materials for manufacturing the sand mold are foundry sand and a molding sand binder, the common molding sand binder can be divided into an organic type (such as phenolic resin, cold box resin and the like) and an inorganic type (such as clay, water glass and the like), while the common foundry sand is silica sand (20-140 meshes of particles), 1 ton of foundry waste sand is generated when 1 ton of castings are produced, a large amount of silica sand comes from the nature, and the scale development of the foundry industry necessarily causes the large exploitation of natural silica sand resources and the discarding of a large amount of waste sand containing harmful substances. In order to realize sustainable development of the foundry industry, the foundry waste sand needs to be recycled so as to protect the earth resources and the environment.

During the process of recycling the waste foundry sand, a large amount of tail gas is generated, wherein the tail gas mainly comprises fine silicon dioxide powder, fine particles and additives (clay, coal powder, resin and the like) remained after the sand is used for casting, and volatile organic gases (VOCs), nitrogen oxides, sulfur dioxide and the like are formed by volatilization and reaction at high temperature in the thermal regeneration process. Therefore, denitration treatment is required to remove nitrogen oxides in the flue gas. The common denitration process is an SCR denitration process, NOx in the flue gas and an ammonia/urea solution from a reducing agent supply system are mixed at a certain temperature by using a catalyst to generate a selective catalytic reduction reaction to generate nitrogen and water, so that the emission of NOx is reduced, and the pollution of the flue gas to the environment is reduced. The existing denitration device generally adopts direct spraying when spraying urea solution, and the flue gas is not well controlled completely whether to contact with the urea solution on the surface of the catalyst for reaction and whether to meet the concentration of the contacted solution, thereby causing poor denitration effect.

Disclosure of Invention

Not enough to above-mentioned prior art exists, the utility model aims to provide a denitration treatment equipment for casting waste sand regeneration tail gas, simple structure is reasonable, can make the flue gas at catalyst surface and urea solution contact reaction and fully react completely, and the denitration is effectual.

In order to achieve the above purpose, the utility model provides a technical scheme as follows:

a denitration treatment device for casting waste sand regeneration tail gas comprises a fixed support and a denitration device body, wherein the denitration device body is welded with the fixed support;

the denitration device body comprises an outer shell and an inner denitration assembly, the top of the outer shell is open, the bottom of the outer shell is connected with an elbow, and the middle of the outer shell is provided with a plurality of operation doors which can be opened and closed; the bottom of the elbow is provided with a collecting port;

the internal denitration assembly comprises a plurality of catalyst support frames, a catalysis plate and a urea solution spraying device, and the catalysis plate and the urea solution spraying device are sequentially and crossly stacked on the catalyst support frames; the urea solution spraying device comprises a rectangular frame and a plurality of spraying pipes connected to the rectangular frame, a plurality of nozzles are uniformly distributed on the spraying pipes, two ends of each spraying pipe are connected with urea solution shunting pipelines, and the shunting pipelines are connected with a main pipeline; and a through hole for mounting the main pipeline is formed in the outer shell.

The denitration device is provided with the operation door, so that the internal catalytic reaction device can be conveniently filled and maintained, the catalytic plates and the urea solution spraying devices are sequentially and crossly stacked on the catalyst support frame, and the spraying devices are provided with the plurality of nozzles, so that the urea solution is completely sprayed on the surface of the catalytic plate, the flue gas can be in contact reaction with the urea solution on the surface of the catalyst and fully reacts, and the denitration effect is good.

Specifically, the catalytic plate and the urea solution spraying device can be fixedly connected or only stacked, and meanwhile, the catalyst support frame and the catalytic plate or the urea solution spraying device can be fixedly connected or not connected.

Preferably, the middle part of the rectangular frame is provided with a reinforcing strip, and the plurality of spray pipes are mutually crossed and fixedly connected to the four end parts of the rectangular frame and the middle part of the reinforcing strip. The spray pipes are uniformly distributed with nozzles, and the number of the nozzles can be determined according to the spray effect. The spray pipes are fixed on the rectangular frame in a crossed manner, so that the spray area is fully covered on the catalytic plate.

Preferably, the catalyst support frame is a rectangular frame, a reinforcing strip is arranged in the middle of the frame, and the catalyst support frame is connected with the inner wall of the outer shell in a sliding mode. The catalyst support frame has a simple structure and low cost, is connected with the inner wall in a sliding manner, and is convenient to install and overhaul.

Preferably, the catalytic plate is a catalyst mesh layer with honeycomb-shaped through holes. The honeycomb-shaped through hole net layer has high specific surface area, so the reaction area is high and the reaction is more sufficient.

Preferably, two openable and closable operation doors which are adjacent up and down are arranged in the middle of the outer shell, and the operation doors are provided with asbestos ropes.

Preferably, the outer housing is provided with a plurality of reinforcing ribs on an outer sidewall. The provision of the reinforcing ribs increases the strength of the outer shell.

Preferably, the thickness of the catalytic plate is 2-3 times of the thickness of the urea solution spraying device, and the catalytic plate and the urea solution spraying device are sequentially overlapped from top to bottom. The thickness design of catalysis board and urea solution spray set has considered cost and denitration effect comprehensively, has reached a preferred scheme. Preferably, the top of the spray nozzle on the spray pipe does not enter the mesh of the upper catalytic plate. The top of the nozzle does not enter the mesh, and the spraying range is larger.

Preferably, the bottom of the fixed support is connected with a ground base material through a bolt.

Preferably, the top opening of the outer shell is an air inlet, the outlet of the elbow is an air outlet, and the radial size of the collecting port is half of the pipe diameter of the elbow. The flue gas flows through from top to bottom, exports from the elbow, sets up the collection mouth in the bottom of elbow and is used for collecting tiny particle dust and waste liquid.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model is used for denitration treatment equipment of casting waste sand regeneration tail gas has seted up the operation door, makes things convenient for loading and maintenance of inside catalytic reaction device, and catalysis board and urea solution spray set alternately stack on the catalyst support frame in proper order, and spray set sets up a plurality of nozzles, makes the catalysis board surface spray completely has urea solution, can make the flue gas at catalyst surface and urea solution contact reaction and fully react completely, and the denitration is effectual.

Drawings

Fig. 1 is a schematic front structural view of the present invention.

Fig. 2 is a schematic side view of the present invention.

Fig. 3 is a schematic diagram of the structure of the catalyst support frame of the present invention.

Fig. 4 is the schematic view of the stacked structure of the catalytic board and the urea solution spraying device of the present invention.

Fig. 5 is a schematic structural view of a urea solution spraying device.

FIG. 6 is a schematic diagram of a catalyst plate structure.

The figure includes:

1-inlet of air

2-operating door

3-elbow

4-air outlet

5-collection port

6-fixed support

7-reinforcing Ribs

8-through hole

9-urea solution spraying device

91-shower

92-rectangular frame

93-reinforcing strip

94-nozzle

10-catalytic plate

11-catalyst support

12-shunt pipe

13-main pipe

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the following embodiments and accompanying drawings, but the scope of the present invention is not limited to the embodiments.

Example 1:

as shown in FIGS. 1-6,

a denitration treatment device for casting waste sand regeneration tail gas comprises a fixed support 6 and a denitration device body, wherein the denitration device body is welded with the fixed support; the bottom of the fixed support 6 is connected with a ground base material through a bolt. The denitration device body comprises an outer shell and an inner denitration assembly, wherein the inner denitration assembly is arranged in the outer shell and fills an inner cavity of the outer shell.

The top opening of outside casing, the bottom of outside casing is connected with elbow 3, the bottom of elbow 3 is equipped with collects mouthful 5. The top opening of the outer shell is an air inlet 1, the outlet of the elbow is an air outlet 4, and the radial size of the collecting port 5 is half of the pipe diameter of the elbow 3. Flue gas (casting waste sand regeneration tail gas) flows through from top to bottom in denitration equipment, and is exported from the elbow, sets up the collection mouth in the bottom of elbow and is used for collecting tiny particle dust and waste liquid.

Two adjacent operation doors 2 that can open and close about the middle part of outside casing is equipped with, operation door 2 installs the asbestos cord. The operation door is used for manual installation/replacement of the internal denitration module or inspection, maintenance, and the like. The outer casing is provided with a plurality of reinforcing ribs 7 on the outer side wall.

Inside denitration subassembly divide into two sets ofly, including 2 catalyst support frames 11, 10

catalysis boards

10 and 10 urea solution spray set 9, two sets of inside range from top to bottom of outside casing. Each group is composed of 5 catalytic plates 10 and 5 urea solution spraying devices 9 which are sequentially superposed on 1 catalyst support frame 11 from top to bottom according to the sequence of the catalytic plates and the urea solution spraying devices. Catalyst support frame 11 is the rectangle frame, and the middle part of frame is equipped with the reinforcement strip, catalyst support frame 11 and outside casing inner wall sliding connection. The catalyst support frame has a simple structure and low cost, is connected with the inner wall in a sliding manner, and is convenient to install and overhaul. The thickness of the catalytic plate is 2-3 times of that of the urea solution spraying device.

As shown in fig. 6, the catalyst sheet 10 is a catalyst mesh layer having honeycomb-shaped through holes. The honeycomb-shaped through hole net layer has high specific surface area, so that the reaction area is high and the reaction is more sufficient.

As shown in fig. 5, the urea solution spraying device 9 includes a

rectangular frame

92 and 2 spraying pipes 91 connected to the rectangular frame 92, a reinforcing bar 93 is disposed in the middle of the rectangular frame 92, the 2 spraying pipes 91 are mutually crossed and fixedly connected to four end portions of the rectangular frame 92 and the middle portion of the reinforcing

bar

93, 7 nozzles 94 are uniformly distributed on the spraying pipes 91, two ends of the spraying pipes 91 are connected to a urea solution diversion pipeline 12, and the diversion pipeline 12 is connected to a main pipeline 13; and the outer shell is provided with a through hole 8 for mounting a main pipeline 13. The top of the spray nozzle 94 on the spray pipe 91 does not enter the mesh of the upper catalytic plate 10. The top of the nozzle does not enter the mesh, and the spraying range is larger.

In this embodiment, the catalyst plate is fixedly connected to the urea solution spraying device, and the catalyst support frame is fixedly connected to the urea solution spraying device.

Example 2

In one of the implementation modes of the utility model,

the main technical solution of this embodiment is substantially the same as that of embodiment 1, and the features that are not explained in this embodiment adopt the explanations in embodiment 1, and are not described herein again. This example differs from example 1 in that: in the embodiment, the catalytic plate and the urea solution spraying device are only stacked and not fixedly connected; meanwhile, the catalyst support frame is not fixedly connected with the urea solution spraying device.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. Furthermore, although specific terms are used in the description of the present invention, these terms are for convenience of description only and do not limit the present invention in any way.

Claims

1. A denitration treatment device for casting waste sand regeneration tail gas comprises a fixed support and a denitration device body, and is characterized in that the denitration device body is welded with the fixed support;

the internal denitration assembly comprises a plurality of catalyst support frames, a catalytic plate and a urea solution spraying device, and the catalytic plate and the urea solution spraying device are sequentially and alternately stacked on the catalyst support frames; the urea solution spraying device comprises a rectangular frame and a plurality of spraying pipes connected to the rectangular frame, a plurality of nozzles are uniformly distributed on the spraying pipes, two ends of each spraying pipe are connected with a urea solution shunting pipeline, and the shunting pipelines are connected with a main pipeline; and a through hole for mounting the main pipeline is formed in the outer shell.

2. The denitration treatment equipment for the regeneration tail gas of the foundry waste sand as claimed in claim 1, wherein a reinforcing strip is arranged in the middle of the rectangular frame, and a plurality of spray pipes are mutually crossed and fixedly connected to the four end parts of the rectangular frame and the middle part of the reinforcing strip.

3. The denitration treatment equipment for the regeneration tail gas of the foundry waste sand as claimed in claim 1, wherein the catalyst support frame is a rectangular frame, a reinforcing strip is arranged in the middle of the frame, and the catalyst support frame is slidably connected with the inner wall of the outer shell.

4. The denitration treatment equipment for the regeneration tail gas of the foundry waste sand as claimed in claim 1, characterized in that the catalytic board is a catalyst mesh layer with honeycomb-shaped through holes.

5. The denitration treatment equipment for the foundry waste sand regeneration tail gas according to claim 1, characterized in that two openable and closable operation doors which are adjacent up and down are arranged in the middle of the outer shell, and the operation doors are provided with asbestos ropes.

6. The denitration treatment equipment for foundry waste sand regeneration tail gas according to claim 1, characterized in that the outer casing is provided with a plurality of reinforcing ribs on the outer side wall.

7. The denitration treatment equipment for the regeneration tail gas of the casting waste sand according to claim 4, wherein the thickness of the catalytic plate is 2-3 times of that of the urea solution spraying device, and the catalytic plate and the urea solution spraying device are sequentially overlapped from top to bottom.

8. The denitration treatment equipment for the regeneration tail gas of the foundry waste sand as claimed in claim 7, characterized in that the top of the spray nozzles on the spray pipes do not enter the mesh holes of the upper catalytic plate.

9. The denitration treatment equipment for the regeneration tail gas of the foundry waste sand as claimed in claim 1, wherein the bottom of the fixed support is connected with a ground base material through a bolt.

10. The denitration treatment equipment for the foundry waste sand regeneration tail gas as recited in claim 1, wherein the top opening of the outer casing is an air inlet, the outlet of the elbow is an air outlet, and the radial dimension of the collection port is half of the pipe diameter of the elbow.