Damping large-emission recovery dust removal system

Abstract

The utility model provides a damping-down large-diffusion recovery dust removal system which comprises a diffusion pipe, the diffusion pipe is arranged at the top of a blast furnace, the diffusion pipe is communicated with a nitrogen tank and a dust remover through a nitrogen replacement loop and a damping-down gas loop respectively, and the nitrogen tank is further communicated with the dust remover through a nitrogen ash removal loop; damping-down coal gas is connected into a dust remover through double bleeding pipes at the furnace top, bleeding is conducted through the dust remover after damping-down is completed, damping-down recycling operation is added on the basis of damping-down safe operation, air pressure of an air opening is controlled and reduced, top pressure is reduced, residual coal gas at the furnace top is recycled through a damping-down ejection system, and after the bleeding condition is met, the newly-added dust remover is started to purify residual smoke dust. Starting furnace top large diffusion to complete a damping down process; the system is matched with a damping-down, diffusing and recycling system, part of gas which cannot be recycled is purified and discharged, air pollution is reduced, safe use is guaranteed, compared with the prior art, the system is more mature, and visual pollution and environmental pollution caused by secondary emission are avoided.

Description

Technical Field

[0001] The utility model relates to the field of blast furnace top large-scale blow-off gas recovery, in particular to a blow-off recovery and dust removal system during blast furnace shutdown. Background Art

[0002] During the blast furnace smelting production process, the blast furnace top gas during shutdown is usually directly discharged into the atmosphere. The blast furnace shutdown gas is a toxic, combustible, and mixed gas containing a large amount of CO, CO2, and dust, which is extremely easy to cause atmospheric environmental pollution and also wastes energy.

[0003] In view of the large amount of dusty gas generated during blast furnace maintenance shutdown and blow-off, direct discharge into the air will seriously affect the environment. Therefore, there are currently blow-off recovery technologies, but related technologies will have problems such as incomplete recovery at the end of recovery or being unsuitable for recovering some gas, and still need to be discharged into the air.

[0004] Based on the above problems, there is an urgent need for a blow-off recovery and dust removal system during blast furnace shutdown, which can solve the problem of discharging blast furnace shutdown gas. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a blow-off recovery and dust removal system during blast furnace shutdown to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above purpose, the utility model provides the following scheme:

[0007] The utility model provides a blow-off recovery and dust removal system during blast furnace shutdown, including a blow-off pipe. The blow-off pipe is arranged at the blast furnace top. The blow-off pipe is respectively connected to a nitrogen tank and a dust collector through a nitrogen replacement circuit and a blast furnace shutdown gas circuit. The nitrogen tank is also connected to the dust collector through a nitrogen dust cleaning circuit.

[0008] Preferably, at least 2 groups of blow-off pipes are provided.

[0009] Preferably, the nitrogen replacement circuit includes a nitrogen replacement pipeline. One end of the nitrogen replacement pipeline is connected to the outlet of the nitrogen tank, and the other end is connected to the top of the blow-off pipe. A pneumatic control valve is arranged on the nitrogen replacement pipeline.

[0010] Preferably, the blast furnace shutdown gas circuit includes a blast furnace shutdown gas pipeline. One end of the blast furnace shutdown gas pipeline is connected to the middle of the blow-off pipe, and the other end is connected to the inlet of the dust collector. A pneumatic control valve and an electric blind plate valve are arranged on the blast furnace shutdown gas pipeline.

[0011] Preferably, the nitrogen dust cleaning circuit includes a nitrogen dust cleaning pipeline. One end of the nitrogen dust cleaning pipeline is connected to the outlet of the nitrogen tank, and the other end is connected to the inlet of the dust collector. A pneumatic control valve is arranged on the nitrogen dust cleaning pipeline.

[0012] The utility model has achieved the following beneficial technical effects compared with the prior art:

[0013] A blow-off and recovery dust removal system for blast furnace shutdown provided by the utility model comprises a blow-off pipe, which is arranged on the top of the blast furnace. The blow-off pipe is respectively communicated with a nitrogen tank and a dust collector through a nitrogen replacement loop and a shutdown gas loop. The nitrogen tank is also communicated with the dust collector through a nitrogen ash cleaning loop. The shutdown gas is introduced into the dust collector through the double blow-off pipes on the top of the furnace. After the shutdown is completed, the blow-off is carried out through the dust collector. On the basis of safe shutdown operation, the shutdown recovery operation is added, the tuyere air pressure is controlled to be reduced, the top pressure is reduced, the residual gas at the top of the furnace is recovered by the shutdown ejector system, and after reaching the blow-off condition, the newly added dust collector is started to purify the residual soot, and the blow-off at the top of the furnace is started to complete the shutdown process. Matching this system with the shutdown blow-off recovery system, the part of the gas that cannot be recovered is purified and discharged, reducing air pollution and ensuring safe use. Compared with the prior art, it is more mature and avoids the visual pollution and environmental pollution caused by secondary emissions. Brief Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic diagram of a blow-off and recovery dust removal system for blast furnace shutdown provided by the utility model. Detailed Embodiments

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present utility model.

[0017] The purpose of the present utility model is to provide a blow-off and recovery dust removal system for blast furnace shutdown to solve the problems existing in the prior art.

[0018] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0019] Embodiment 1:

[0020] This embodiment provides a blow-off and recovery dust removal system for blast furnace shutdown, asFigure 1 As shown in the figure, it includes a blow-off pipe 1 which is arranged at the top of the blast furnace. The blow-off pipe 1 is respectively connected to a nitrogen tank 4 and a dust collector 5 through a nitrogen replacement circuit 2 and a blast-furnace shutdown gas circuit 3. The nitrogen tank 4 is also connected to the dust collector 5 through a nitrogen dust cleaning circuit 6.

[0021] As an implementation manner, at least two groups of blow-off pipes are provided.

[0022] As an implementation manner, the nitrogen replacement circuit 2 includes a nitrogen replacement pipeline. One end of the nitrogen replacement pipeline is connected to the outlet of the nitrogen tank 4, and the other end is connected to the top of the blow-off pipe 1. A pneumatic control valve is provided on the nitrogen replacement pipeline.

[0023] As an implementation manner, the blast-furnace shutdown gas circuit 3 includes a blast-furnace shutdown gas pipeline. One end of the blast-furnace shutdown gas pipeline is connected to the middle of the blow-off pipe 1, and the other end is connected to the inlet of the dust collector 5. A pneumatic control valve and an electric blind plate valve are provided on the blast-furnace shutdown gas pipeline.

[0024] As an implementation manner, the nitrogen dust cleaning circuit 6 includes a nitrogen dust cleaning pipeline. One end of the nitrogen dust cleaning pipeline is connected to the outlet of the nitrogen tank 4, and the other end is connected to the inlet of the dust collector 5. A pneumatic control valve is provided on the nitrogen dust cleaning pipeline.

[0025] A blast-furnace shutdown large blow-off recovery and dust removal system provided by the present utility model connects the blast-furnace shutdown gas to the dust collector through a double blow-off pipe at the top of the furnace. After the blast-furnace shutdown is completed, the blow-off is carried out through the dust collector. On the basis of safe blast-furnace shutdown operation, blast-furnace shutdown recovery operation is added, the tuyere air pressure is controlled to be reduced, the top pressure is reduced, the blast-furnace shutdown ejection system recovers the residual gas at the top of the furnace, and after reaching the blow-off condition, a newly added dust collector is opened to purify the residual dust, and the blast-furnace shutdown process is completed by opening the large blow-off at the top of the furnace; the above system has been reviewed and passed in Hubei Jinshenglan Iron and Steel Plant and is planned to be implemented. Through expert demonstration and review, the system is safe and reliable, can meet the environmental protection requirements, reduce the pollution of emissions to the atmosphere, and can work in cooperation with the clean gas recovery to avoid the occurrence of black smoke emissions.

[0026] The present utility model expounds the principle and implementation manner of the present utility model by using specific examples. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A blast furnace shutdown large-scale gas release recovery and dust removal system, characterized in that: It includes a blow-off pipe, and the blow-off pipe is arranged at the top of the blast furnace. The blow-off pipe is respectively communicated with a nitrogen tank and a dust collector through a nitrogen replacement circuit and a blow-off gas circuit, and the nitrogen tank is also communicated with the dust collector through a nitrogen dust cleaning circuit.

2. The tapping and blowing-off recovery dust removal system according to claim 1, wherein: There are at least two groups of the blow-off pipes.

3. The blast furnace shutdown large-scale gas emission recovery and dust removal system according to claim 1, characterized in that: The nitrogen replacement circuit includes a nitrogen replacement pipeline. One end of the nitrogen replacement pipeline is communicated with the outlet of the nitrogen tank, and the other end is communicated with the top of the blow-off pipe. A pneumatic regulating valve is arranged on the nitrogen replacement pipeline.

4. The blast furnace shutdown large-scale gas emission recovery dust removal system according to claim 1, characterized in that: The blow-off gas circuit includes a blow-off gas pipeline. One end of the blow-off gas pipeline is communicated with the middle part of the blow-off pipe, and the other end is communicated with the inlet of the dust collector. A pneumatic regulating valve and an electric blind plate valve are arranged on the blow-off gas pipeline.

5. The blast furnace shutdown large-scale gas release recovery dust removal system according to claim 1, characterized in that: The nitrogen dust cleaning circuit includes a nitrogen dust cleaning pipeline. One end of the nitrogen dust cleaning pipeline is communicated with the outlet of the nitrogen tank, and the other end is communicated with the inlet of the dust collector. A pneumatic regulating valve is arranged on the nitrogen dust cleaning pipeline.

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