Small-area dust removal device for calcium carbide crushing plant

Abstract

The utility model discloses a small-area dust removal device for a calcium carbide crushing plant, which comprises a calcium carbide crushing field and a dust removal cover arranged right above the calcium carbide crushing field, the top of the dust removal cover is communicated with an inlet of an induced draft fan through an air pipe, an outlet of the induced draft fan is communicated with a bag type dust remover through an air pipe, and the side part of the bag type dust remover is communicated with a blow-down pipe. The bottom of the bag type dust collector is communicated with the dust collecting bin. Dust generated in a calcium carbide crushing field is collected to the bag type dust collector through cooperation of the induced draft fan and the dust removal cover, the dust falls into the dust collection bin after being treated by the bag type dust collector, and treated air is discharged. The whole dust removal process is orderly, dust generated in a calcium carbide crushing field can be collected to the dust collection bin as much as possible, harm and injury of calcium carbide dust to respiratory systems, skins and eyes of operators are avoided, and potential safety hazards in the operation process are reduced.

Description

Technical Field

[0001] The utility model relates to the field of calcium carbide acetylene production equipment, in particular to a small-area dust removal device for a calcium carbide crushing plant. Background Art

[0002] In the production process of calcium carbide acetylene, the calcium carbide raw materials used are in the form of lumps or blocks. In order to ensure the complete hydrolysis of calcium carbide, the acetylene crushing station first needs to manually cooperate with machinery (such as a scraper) to crush the lumps or blocks of calcium carbide. The crushed calcium carbide blocks are ≤600mm in size, and then pushed to the jaw crusher for crushing by a scraper. Finally, the material is sent to the coarse material hopper elevator via a belt conveyor. The material is sent to the coarse material silo by the coarse material hopper elevator. The coarse material silo is filled with nitrogen for protection, and the oxygen (O2) content is required to be less than 1%, and the acetylene (C2H2) content is required to be less than 0.5%.

[0003] However, there are the following problems in the manual crushing of calcium carbide: (1) Large pieces of calcium carbide must first be crushed in the jaw crusher. During the crushing process, a large amount of calcium carbide dust (mainly calcium carbide) is generated in the calcium carbide crushing area. Since calcium carbide dust is a toxic and harmful substance, and the crushing process requires manual cooperation with machinery, calcium carbide dust can easily cause harm and damage to the respiratory system, skin, eyes, etc. of workers, and can also easily cause problems that endanger the environment and public health; (2) Calcium carbide dust is enriched in the workplace, and the risk of fire and explosion is high. Calcium carbide is a Class A fire hazard substance. When it comes into contact with water, it can react violently and quickly generate acetylene gas. The generated acetylene gas is extremely flammable and has a wide explosion limit range. The volume fraction in the air is about 2.5-82%. When mixed with air within this range, it can quickly burn or explode when it encounters an open flame or an appropriate ignition source, resulting in a high safety risk in the workplace. Utility Model Content

[0004] The utility model provides a dust removal device for a small area of ​​a calcium carbide crushing plant, which aims to solve the problems of a large amount of toxic and harmful dust in the calcium carbide crushing process, which is easy to cause damage to the human body, and the enrichment of calcium carbide dust is easy to cause fire and explosion, and the high operation risk.

[0005] To achieve its purpose, the utility model adopts the following technical solutions:

[0006] A small-area dust removal device for a calcium carbide crushing plant includes a calcium carbide crushing site. The dust removal device includes a dust hood located directly above the calcium carbide crushing site. The top of the dust hood is connected to the inlet of the induced draft fan through an air duct, the outlet of the induced draft fan is connected to the bag dust collector through the air duct, the side of the bag dust collector is connected to the vent pipe, and the bottom of the bag dust collector is connected to the dust collection bin.

[0007] Furthermore, an induced draft fan inlet valve is provided on the air duct between the dust removal hood and the induced draft fan.

[0008] Furthermore, the induced draft fan inlet valve is a butterfly valve.

[0009] Furthermore, the bag filter is conical in shape.

[0010] Furthermore, the ground of the calcium carbide crushing site is paved with steel plates with a thickness of ≥100 mm.

[0011] Furthermore, the area of ​​the open area at the bottom of the dust collector is ≥ the area of ​​the entire calcium carbide crushing plant.

[0012] Furthermore, the vertical distance between the lowest point of the bottom of the dust collector and the ground of the calcium carbide crushing site is ≥8m.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] The utility model provides a small-area dust removal device for a calcium carbide crushing plant. The dust generated in the calcium carbide crushing plant is collected into a bag dust collector through the cooperation of an induced draft fan and a dust removal hood. After being processed by the bag dust collector, the dust falls into a dust collection bin, and the processed air is discharged, thereby realizing the linked operation of the device. The entire dust removal process is orderly, and all the dust generated in the calcium carbide crushing plant can be collected into the dust collection bin, effectively controlling dust pollutants in the calcium carbide crushing process, preventing the harm and damage of calcium carbide dust to the respiratory system, skin and eyes of workers, and reducing safety hazards in the operation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of the dust removal device of the present utility model;

[0016] In the figure: 1- calcium carbide crushing plant; 2- dust removal hood; 3- air duct; 4- induced draft fan inlet valve; 5- induced draft fan; 6- bag dust collector; 7- vent pipe; 8- dust collection bin. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings:

[0018] like Figure 1 As shown, the utility model is a small-area dust removal device for a calcium carbide crushing plant, comprising a calcium carbide crushing site 1 for crushing calcium carbide. The calcium carbide crushing site 1 requires manual cooperation with machinery (such as a scraper) to smash and crush the lumpy or block-shaped calcium carbide. A steel plate with a thickness of 100 mm is laid on the ground of the calcium carbide crushing site 1 to prevent damage to the ground during the calcium carbide crushing process.

[0019] The dust removal device includes a dust hood 2 located directly above the calcium carbide crushing site 1. The open area at the bottom of the dust hood 2 is 1.2 times the area of ​​the entire area of ​​the calcium carbide crushing site 1. The vertical distance between the lowest point of the bottom of the dust hood 2 and the ground of the calcium carbide crushing site 1 is 8m, so as to reduce the distance that dust particles diffuse in the air, improve the capture efficiency, ensure that the hood opening is close enough to the dust source, and at the same time do not affect the process operation and equipment maintenance. The top of the dust hood 2 is connected to the inlet of the induced draft fan 5 through the air duct 3. The material of the air duct 3 can be spiral welded pipe. The connection of the air duct 3 requires good sealing to prevent dust from escaping from all around the pipe interface. The sealing effect can be improved by adding flange edges, adopting flexible connections or setting sealing strips. The air duct 3 between the dust hood 2 and the induced draft fan 5 is provided with an induced draft fan inlet valve 4. The induced draft fan inlet valve 4 adopts a high-performance sealed butterfly valve with low fluid resistance, which is conducive to saving energy and reducing operating costs. The outlet of the induced draft fan 5 is connected to the conical bag dust collector 6 through the air duct 3. The conical bottom of the bag dust collector 6 is connected to the dust collection bin 8. The side of the bag dust collector 6 is connected to the vent pipe 7 to discharge the treated air.

[0020] The bag filter 6 is typically made of a textile filter cloth or non-woven felt. The bag is designed to ensure excellent air permeability and filtration performance. As gas passes through the bag, dust particles are trapped by the bag due to screening, inertia, diffusion, adhesion, and electrostatic effects. The bag filter 6 can be cleaned using methods such as backflush, vibration, and pulse jet cleaning. The removed calcium carbide dust falls into an ash hopper and is periodically discharged to a dust collection bin 8.

[0021] Before the system is put into operation, all pipes and fittings in the system are pressure-tested at 1.0 MPa to prevent leakage during production. Metal spiral-wound gaskets are used at all pipe flange connections. During operation, first open the valve on the vent pipe 7 of the bag filter 6, open the valve on the inlet pipe of the dust collection bin 8, and open other relevant valves installed on the air duct according to the design to ensure unobstructed gas flow in the dust removal system. Then, close the induced draft fan inlet valve 4 and start the induced draft fan 5. Finally, slowly open the induced draft fan inlet valve 4, observe the suspended dust content and conditions at the work site, and adjust the induced air volume of the dust removal device by adjusting the opening of the induced draft fan inlet valve 4 to achieve the desired dust removal effect.

Claims

1. A small area dust removal device for a calcium carbide crushing plant, comprising a calcium carbide crushing plant (1), characterized in that: The dust removal device comprises a dust removal hood (2) arranged directly above the calcium carbide crushing site (1); the top of the dust removal hood (2) is connected to the inlet of the induced draft fan (5) through the air duct (3); the outlet of the induced draft fan (5) is connected to the bag dust collector (6) through the air duct (3); the side of the bag dust collector (6) is connected to the vent pipe (7); and the bottom of the bag dust collector (6) is connected to the dust collection bin (8).

2. A small area dust removal device for a calcium carbide crushing plant as claimed in claim 1, characterized in that: An induced draft fan inlet valve (4) is provided on the air duct (3) between the dust removal hood (2) and the induced draft fan (5).

3. A small area dust removal device for a calcium carbide crushing plant as claimed in claim 2, characterized in that: The induced draft fan inlet valve (4) is a butterfly valve.

4. A small area dust removal device for a calcium carbide crushing plant as claimed in claim 3, characterized in that: The bag dust collector (6) is conical.

5. A small area dust removal device for a calcium carbide crushing plant as claimed in claim 4, characterized in that: The ground of the calcium carbide crushing site (1) is paved with steel plates with a thickness of ≥100 mm.

6. A small area dust removal device for a calcium carbide crushing plant as claimed in claim 5, characterized in that: The area of ​​the open area at the bottom of the dust removal hood (2) is greater than or equal to the total area of ​​the calcium carbide crushing site (1).

7. A small area dust removal device for a calcium carbide crushing plant as claimed in claim 6, characterized in that: The vertical distance between the lowest point of the bottom of the dust removal hood (2) and the ground of the calcium carbide crushing site (1) is ≥8m.

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