Improved exhaust device at tail end for centralized conveying of SiO2 dust

Abstract

The utility model relates to a SiO2 dust centralized conveying tail end exhaust improved device which comprises a bag-type dust collector, a gas inlet end of the bag-type dust collector is used for inputting gas containing hydrogen chloride and silicon dioxide, and the bag-type dust collector is used for removing silicon dioxide dust in the gas; the centralized ash conveying pipeline is used for receiving and conveying silicon dioxide dust; the stock bin is communicated with the centralized ash conveying pipeline, and the stock bin is used for removing silicon dioxide dust for the second time; the draught fan is connected with the stock bin and used for conveying the silicon dioxide dust in the centralized dust conveying pipeline into the stock bin, and the exhaust end of the draught fan communicates with the air supplementing opening of the bag-type dust remover. According to the improved tail end exhaust device for concentrated conveying of the Si02 dust, HC-containing gas exhausted from the tail end is collected and is connected with the air supplementing opening through the pipeline, so that cyclic utilization is achieved, zero emission is achieved, and the conditions that the environment is polluted, a steel structure is rusted and unnecessary loss is caused are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of dust removal, in particular to a SiO2 dust centralized dust conveying terminal exhaust improvement device. Background Art

[0002] In recent years, domestic steel enterprises have generally adopted full-dry bag dust collector technology for blast furnace gas, which has brought great economic and social benefits. However, with the continuous accumulation of production experience, it has been found that when blast furnace gas adopts full-dry bag dust collector, it has the following defects when transporting SiO2 dust:

[0003] (1) The gas discharged by the Roots blower at the end contains a small amount of HC1 gas. When it rains or is humid, after long-term operation, the steel structure near the site will be severely corroded, causing losses.

[0004] (2) The temperature of the dust filtered from multiple chambers is relatively high. Although the entire section of the centralized ash conveying pipeline is currently insulated, the effect is general. After long-term operation, HC1 gas condenses, causing dust to stick to the inner wall of the pipeline, corroding the pipeline and also clogging the pipeline.

[0005] (3) HCl gas is discharged into the atmosphere, which not only pollutes the environment but also affects the health of on-site operators. Utility Model Content

[0006] To this end, the technical problem to be solved by the utility model is to overcome the problem in the prior art that when multiple chambers are filtering SiO2 dust, even if the air valves at the air inlet and air outlet ends of the chamber doors are closed, they cannot be completely closed due to structural problems, resulting in a small amount of HCl gas being mixed in when filtering SiO2 dust, entering the centralized ash conveying pipeline, and being exhausted into the atmosphere through the Roots blower at the rear end. Long-term operation leads to corrosion of nearby steel structures, causing unnecessary losses.

[0007] In order to solve the above technical problems, the utility model provides a SiO2 dust centralized ash conveying terminal exhaust improvement device, including: a bag dust collector, whose air inlet end inputs gas containing hydrogen chloride and silicon dioxide, and the bag dust collector is used to remove silicon dioxide dust in the gas; a centralized ash conveying pipeline, which is connected to the dust outlet at the lower end of the bag dust collector, and the centralized ash conveying pipeline is used to receive and convey silicon dioxide dust; a silo, which is connected to the centralized ash conveying pipeline, and the silo is used to remove silicon dioxide dust for the second time; a fan, which is connected to the silo, and the fan is used to convey the silicon dioxide dust in the centralized ash conveying pipeline into the silo, and the exhaust end of the fan is connected to the air supply port of the bag dust collector. The SiO2 dust centralized ash conveying terminal exhaust improvement device of the utility model collects the HCl-containing gas discharged from the terminal, and connects it to the air supply port through a pipeline, so as to achieve recycling and zero emission at the same time, and no longer pollute the environment, cause steel structure corrosion, and cause unnecessary losses.

[0008] In one embodiment of the present invention, two bag-type dust collectors are provided, and both bag-type dust collectors are connected to a separate centralized ash conveying pipeline.

[0009] In one embodiment of the utility model, the exhaust improvement device further comprises a branch valve, the centralized ash conveying pipes of the two bag filters are connected to the branch valve, and the branch valve is used to gather the silica dust in the two centralized ash conveying pipes.

[0010] In one embodiment of the utility model, the discharge end of the branch valve is connected to a first pipe, the other end of the first pipe away from the branch valve is connected to a silo, and the branch valve is used to gather the silica dust in the two centralized ash conveying pipes to the first pipe.

[0011] In one embodiment of the utility model, the silo adopts a bag dust collector, and the dust outlet at the lower end of the silo is connected to a silica dust collection bag.

[0012] In one embodiment of the utility model, the fan is a Roots blower, and a second pipeline is provided between the fan and the exhaust end of the silo.

[0013] In one embodiment of the utility model, a third pipe is provided between the exhaust end of the fan and the air supply port of the bag filter.

[0014] In one embodiment of the utility model, the dust outlet of the bag filter is provided with a gate valve, and the gate valve is used to discharge silicon dioxide dust when it is opened.

[0015] In one embodiment of the utility model, the dust outlet of the bag filter is provided with a discharger, and the discharger cooperates with the gate valve to discharge the silicon dioxide dust.

[0016] In one embodiment of the utility model, the exhaust end of the bag filter is used to discharge clean hydrogen chloride gas.

[0017] The above technical solution of the SiO2 dust centralized ash conveying terminal exhaust improvement device of the utility model has the following beneficial effects compared with the prior art:

[0018] 1. Compared with the previous dust removal system, the utility model recycles the discharged hydrogen chloride gas and achieves zero emission.

[0019] 2. The nearby steel structures are no longer corroded by hydrogen chloride gas for a long time, thus reducing unnecessary losses.

[0020] 3. The exhausted gas has a certain temperature, which can be recycled and also reduce the condensation and blockage of dust and hydrogen chloride gas in the centralized ash conveying pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein

[0022] Figure 1 It is a schematic diagram of the structure of the SiO2 dust centralized ash conveying terminal exhaust improvement device in the preferred embodiment of the utility model.

[0023] Explanation of the reference numerals in the drawings in the specification: bag filter 1, centralized ash conveying pipeline 2, silo 3, fan 4, branch valve 5, first pipeline 6, second pipeline 7, third pipeline 8, gate valve 9, discharger 10. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0025] Reference Figure 1As shown, the SiO2 dust centralized ash conveying terminal exhaust improvement device of the utility model comprises: a bag dust collector 1, a centralized ash conveying pipeline 2, a silo 3 and a fan 4, several main parts; the bag dust collector 1, the air inlet end of which inputs a gas containing hydrogen chloride and silicon dioxide, the bag dust collector 1 is used to remove silicon dioxide dust in the gas, and the exhaust end of the bag dust collector 1 is used to discharge clean hydrogen chloride gas; the centralized ash conveying pipeline 2, which is connected to the dust outlet at the lower end of the bag dust collector 1, and the centralized ash conveying pipeline 2 is used to receive and convey silicon dioxide dust; the silo 3, which is connected to the centralized ash conveying pipeline 2, and the silo 3 is used for secondary removal of silicon dioxide dust; the fan 4, which is connected to the silo 3, and the fan 4 is used to convey the silicon dioxide dust in the centralized ash conveying pipeline 2 into the silo 3, and the exhaust end of the fan 4 is connected to the air supply port of the bag dust collector 1. The silicon dioxide dust discharged from the end of the centralized ash conveying pipeline 2 contains hydrogen chloride gas, which is connected through a pipeline and docked with the air supply port, and a flexible joint is made at the joint to facilitate disassembly, adjustment and optimization.

[0026] The exhaust gas improvement device further includes a branch valve 5 , and the centralized ash conveying pipelines 2 of the two bag dust collectors 1 are connected to the branch valve 5 , and the branch valve 5 is used to gather the silica dust in the two centralized ash conveying pipelines 2 .

[0027] In the above structure, the bag filter 1 is provided in two pieces, and the two bag filter 1 are connected to separate centralized ash conveying pipelines 2. The discharge end of the branch valve 5 is connected to the first pipeline 6, and the other end of the first pipeline 6 away from the branch valve 5 is connected to the silo 3. The branch valve 5 is used to gather the silica dust in the two centralized ash conveying pipelines 2 to the first pipeline 6.

[0028] In the above structure, the silo 3 adopts a bag dust collector, and the dust outlet at the lower end of the silo 3 is connected to a silica dust collection bag.

[0029] In the above structure, the fan 4 is a Roots blower, and a second pipe 7 is provided between the fan 4 and the exhaust end of the silo 3. A third pipe 8 is provided between the exhaust end of the fan 4 and the air supply port of the bag filter 1. The gas containing hydrogen chloride can be guided back to the air supply port of the bag filter 1 through the third pipe 8 for use in dust removal by the bag filter 1.

[0030] In the above structure, the dust outlet of the bag filter 1 is provided with a gate valve 9, which is used to discharge silicon dioxide dust when opened. The dust outlet of the bag filter 1 is provided with a discharger 10, which cooperates with the gate valve 9 to discharge silicon dioxide dust.

[0031] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A SiO2 dust centralized ash conveying terminal exhaust improvement device, characterized in that: include, A bag filter, the gas containing hydrogen chloride and silicon dioxide is input into the air inlet end of which, and the bag filter is used to remove silicon dioxide dust in the gas; A centralized ash conveying pipeline is connected to the dust outlet at the lower end of the bag filter, and the centralized ash conveying pipeline is used to receive and convey silica dust; A silo is connected to the centralized ash conveying pipeline and is used for secondary removal of silica dust; The fan is connected to the silo and is used to transport the silica dust in the centralized ash conveying pipeline into the silo. The exhaust end of the fan is connected to the air supply port of the bag filter.

2. The SiO2 dust centralized ash conveying terminal exhaust improvement device according to claim 1 is characterized in that: The bag dust collectors are provided with two, and both bag dust collectors are connected with a separate centralized ash conveying pipeline.

3. The SiO2 dust centralized ash conveying terminal exhaust improvement device according to claim 2 is characterized in that: The exhaust gas improvement device also includes a branch valve, and the centralized ash conveying pipelines of the two bag dust collectors are connected to the branch valve, and the branch valve is used to gather the silica dust in the two centralized ash conveying pipelines.

4. The SiO2 dust centralized ash conveying terminal exhaust improvement device according to claim 3 is characterized in that: The discharge end of the branch valve is connected to a first pipeline, and the other end of the first pipeline away from the branch valve is connected to a silo. The branch valve is used to gather the silica dust in the two centralized ash conveying pipelines to the first pipeline.

5. The SiO2 dust centralized ash conveying terminal exhaust improvement device according to claim 1 is characterized in that: The silo adopts a bag dust collector, and the dust outlet at the lower end of the silo is connected to a silicon dioxide dust collection bag.

6. The SiO2 dust centralized ash conveying terminal exhaust improvement device according to claim 1 is characterized in that: The fan is a Roots blower, and a second pipeline is provided between the fan and the exhaust end of the silo.

7. The SiO2 dust centralized ash conveying terminal exhaust improvement device according to claim 6 is characterized in that: A third pipeline is provided between the exhaust end of the fan and the air supply port of the bag filter.

8. The SiO2 dust centralized ash conveying terminal exhaust improvement device according to claim 1 is characterized in that: The dust outlet of the bag filter is provided with a gate valve, and the gate valve is used to discharge silicon dioxide dust when it is opened.

9. The SiO2 dust centralized ash conveying terminal exhaust improvement device according to claim 8 is characterized in that: The dust outlet of the bag filter is provided with a discharger, and the discharger cooperates with the gate valve to discharge the silicon dioxide dust.

10. The SiO2 dust centralized ash conveying terminal exhaust improvement device according to claim 1 is characterized in that: The exhaust end of the bag filter is used to discharge clean hydrogen chloride gas.

Images