阅读说明：本技术 一种高炉煤气干法除尘净煤气反吹清灰系统 (Blast furnace gas dry dedusting clean gas blowback ash removal system ) 是由 亓庆台 吕子祥 郑伟 蔡廷文 于 2019-11-14 设计创作，主要内容包括：本发明公开了一种高炉煤气干法除尘净煤气反吹清灰系统,布袋除尘器箱体下端设有与其连通的荒煤气支管,荒煤气支管与荒煤气总管连通,布袋除尘器箱体上端设有与其连通的净煤气支管,净煤气支管与高压净煤气总管连通,高压净煤气总管上设有调压阀组,高压净煤气总管上调压阀组外侧设有与其连通的TRT机组,高压净煤气总管通过调压阀组与低压煤气总管连通,净煤气支管上设有与其连通的泄压支管,泄压支管上设有与其连通的泄压总管,泄压总管上设有引射器,引射器通过引射气管道和引射器出口管分别高压净煤气总管和低压煤气总管连通。本发明的优点在于：成本低、检查和维护频率低、对煤气热值无影响、使用方便。(The invention discloses a blast furnace gas dry dedusting clean gas back-blowing ash removal system.A raw gas branch pipe communicated with a bag-type dust remover box body is arranged at the lower end of the bag-type dust remover box body, the raw gas branch pipe is communicated with a raw gas main pipe, a clean gas branch pipe communicated with the bag-type dust remover box body is arranged at the upper end of the bag-type dust remover box body, the clean gas branch pipe is communicated with a high-pressure clean gas main pipe, a pressure regulating valve group is arranged on the high-pressure clean gas main pipe, a TRT unit communicated with the high-pressure clean gas main pipe is arranged on the outer side of the pressure regulating valve group on the high-pressure clean gas main pipe, the high-pressure clean gas main pipe is communicated with a low-pressure gas main pipe through the pressure regulating valve group, a pressure relief branch pipe communicated with the clean gas branch pipe. The invention has the advantages that: low cost, low inspection and maintenance frequency, no influence on the calorific value of the gas and convenient use.)

1. The utility model provides a blast furnace gas dry process dust removal clean gas blowback deashing system, includes raw coke oven gas house steward (1), high-pressure clean gas house steward (21) and sack cleaner box (2), its characterized in that: the device is characterized in that a raw gas branch pipe (4) communicated with the bag-type dust remover box body (2) is arranged at the lower end of the bag-type dust remover box body (2), the raw gas branch pipe (4) is communicated with a raw gas main pipe (1), a clean gas branch pipe (6) communicated with the bag-type dust remover box body (2) is arranged at the upper end of the bag-type dust remover box body (2), the clean gas branch pipe (6) is communicated with a high-pressure clean gas main pipe (21), a pressure regulating valve group (22) is arranged on the high-pressure clean gas main pipe (21), a TRT unit (23) communicated with the high-pressure clean gas main pipe (22) is arranged on the outer side of the pressure regulating valve group (22) on the high-pressure clean gas main pipe (21), the high-pressure clean gas main pipe (21) is communicated with a low-pressure gas main pipe (24) through the pressure regulating valve group (22), a pressure relief, the ejector (17) is communicated with the high-pressure clean gas main pipe (21) and the low-pressure gas main pipe (24) through an ejector gas pipeline (15) and an ejector outlet pipe (20).

2. The blast furnace gas dry dedusting clean gas back-flushing ash removal system according to claim 1, characterized in that: a dust remover inlet gate valve (3) is arranged at the joint of the raw gas branch pipe (4) and the bag-type dust remover box body (2), and a dust remover inlet butterfly valve (5) is arranged at the joint of the raw gas branch pipe (4) and the raw gas main pipe (1).

3. The blast furnace gas dry dedusting clean gas back-flushing ash removal system according to claim 1, characterized in that: and a dust remover outlet butterfly valve (7) and a dust remover outlet gate valve (8) are arranged on the clean gas branch pipe (6).

4. The blast furnace gas dry dedusting clean gas back-flushing ash removal system according to claim 1, characterized in that: and a pressure relief branch butterfly valve (10) and a pressure relief branch blind plate valve (11) are arranged on the pressure relief branch (9).

5. The blast furnace gas dry dedusting clean gas back-flushing ash removal system according to claim 1, characterized in that: and the injection gas pipeline (15) is provided with an injection gas butterfly valve (13), an injection gas blind plate valve (14) and an injection valve (16).

6. The blast furnace gas dry dedusting clean gas back-flushing ash removal system according to claim 1, characterized in that: an ejector outlet blind plate valve (18) and an ejector outlet butterfly valve (19) are arranged on the ejector outlet pipe (20).

Technical Field

The invention relates to the technical field of dry dedusting and deashing systems, in particular to a blast furnace gas dry dedusting clean gas back-flushing deashing system.

Background

The dry dust removal of blast furnace gas is used for most blast furnaces in China at present as a mature dust removal process, the dust removal of the dry dust removal of the blast furnace gas adopts most nitrogen pulse back blowing dust removal, the dust removal mode has simple process pipelines, does not need to consider a gas pressurizer, saves investment, has stable and easily-adjusted nitrogen gas source, and is beneficial to improving the service life of a filter bag and the back blowing effect of a system. However, there are several problems in using nitrogen pulse back-flushing to remove ash: 1. the pulse back flushing of the nitrogen for dust removal needs to consume more nitrogen, and the cost is higher; 2. the pulse valve is needed to be used for nitrogen pulse back flushing and dust cleaning, particularly the pulse diaphragm belongs to a vulnerable part and needs to be frequently checked, maintained and replaced, so that the labor intensity of workers is increased, and the maintenance and repair cost is increased; 3. the pulse back flushing of the nitrogen for ash removal can cause the nitrogen content in a blast furnace gas pipe network to be slightly increased, and has slight influence on the heat value of the gas. When the pressure of the top of the blast furnace is higher, high-pressure clean gas is adopted for back flushing and ash removal, so that the problems caused by the adoption of nitrogen pulse back flushing and ash removal can be solved.

According to retrieval, at present, there are reports about the adoption of high-pressure clean gas for back-blowing ash removal, but before back-blowing ash removal, the pressure relief time in the box body of the dust remover is longer, so that the normal operation of the dust remover is influenced.

Disclosure of Invention

The invention aims to solve the technical problems and provides a blast furnace gas dry-method dedusting clean gas back-flushing ash removal system which is low in cost, low in inspection and maintenance frequency, free of influence on gas heat value and convenient to use.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: a blast furnace gas dry dedusting clean gas back-flushing deashing system comprises a crude gas main pipe, a high-pressure clean gas main pipe and a bag-type dust remover box body, the lower end of the bag-type dust collector box body is provided with a raw gas branch pipe communicated with the bag-type dust collector box body, the raw gas branch pipe is communicated with a raw gas main pipe, the upper end of the bag-type dust collector box body is provided with a clean gas branch pipe communicated with the bag-type dust collector box body, the clean gas branch pipe is communicated with a high-pressure clean gas main pipe, the high-pressure clean gas main pipe is provided with a pressure regulating valve group, the outer side of the pressure regulating valve group on the high-pressure clean gas main pipe is provided with a TRT unit communicated with the high-pressure clean gas main pipe, the high-pressure clean gas main pipe is communicated with the low-pressure gas main pipe through a pressure regulating valve group, the clean gas branch pipe is provided with a pressure relief branch pipe communicated with the clean gas branch pipe, the pressure relief branch pipe is provided with a pressure relief main pipe communicated with the pressure relief branch pipe, the pressure relief main pipe is provided with an ejector, the ejector is communicated with the high-pressure clean gas main pipe and the low-pressure gas main pipe through an ejector gas pipeline and an ejector outlet pipe respectively.

Compared with the prior art, the invention has the advantages that: this clean coal gas blowback deashing system of blast furnace gas dry process dust removal, the pressure release pipeline of sack cleaner box exit connection, be equipped with the ejector on the pressure release person in charge, the ejector's of ejector draw the jet-propelled air supply and come from high-pressure clean coal gas pipeline, under the suction effect of ejector, can be quick with the internal coal gas pressure drop of dust remover to low pressure coal gas pipe network pressure, through opening and closing of relevant valves, high-pressure coal gas in the high-pressure coal gas pipe network is through flowing against to the dust remover box, make the internal sack shake of box, realize the purpose of deashing, the whole frame of system is simple and reliable, need not frequent inspection and maintenance, nitrogen gas is not used, the expense is low, and do not have the influence to the.

As an improvement, a dust remover inlet gate valve is arranged at the joint of the raw gas branch pipe and the bag-type dust remover box body, and a dust remover inlet butterfly valve is arranged at the joint of the raw gas branch pipe and the raw gas main pipe.

As an improvement, a dust remover outlet butterfly valve and a dust remover outlet gate valve are arranged on the clean gas branch pipe.

As an improvement, a pressure relief branch butterfly valve and a pressure relief branch blind plate valve are arranged on the pressure relief branch.

As an improvement, an injection gas butterfly valve, an injection gas blind plate valve and an injection valve are arranged on the injection gas pipeline.

As an improvement, an ejector outlet blind plate valve and an ejector outlet butterfly valve are arranged on the ejector outlet pipe.

Drawings

FIG. 1 is a schematic structural diagram of a clean gas blowback ash removal system for dry dedusting of blast furnace gas.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

With the attached drawings, the blast furnace gas dry dedusting clean gas blowback ash removal system comprises a raw gas main pipe 1, a high-pressure clean gas main pipe 21 and a bag-type dust remover box 2, wherein a raw gas branch pipe 4 communicated with the bag-type dust remover box 2 is arranged at the lower end of the bag-type dust remover box 2, the raw gas branch pipe 4 is communicated with the raw gas main pipe 1, a clean gas branch pipe 6 communicated with the bag-type dust remover box 2 is arranged at the upper end of the bag-type dust remover box 2, the clean gas branch pipe 6 is communicated with the high-pressure clean gas main pipe 21, a pressure regulating valve group 22 is arranged on the high-pressure clean gas main pipe 21, a TRT unit 23 communicated with the high-pressure clean gas main pipe 21 is arranged at the outer side of the pressure regulating valve group 22 on the high-pressure clean gas main pipe 21, the high-pressure clean gas main pipe 21 is communicated with a low, the pressure relief main pipe 12 is provided with an ejector 17, and the ejector 17 is communicated with a high-pressure clean gas main pipe 21 and a low-pressure gas main pipe 24 through an ejector gas pipeline 15 and an ejector outlet pipe 20 respectively.

A dust collector inlet gate valve 3 is arranged at the joint of the raw gas branch pipe 4 and the bag-type dust collector box body 2, a dust collector inlet butterfly valve 5 is arranged at the joint of the raw gas branch pipe 4 and the raw gas main pipe 1, and dust-containing gas enters the bag-type dust collector box body 2 and is controlled by the dust collector inlet butterfly valve 5 and the dust collector inlet gate valve 3.

The clean gas branch pipe 6 is provided with a dust remover outlet butterfly valve 7 and a dust remover outlet gate valve 8, and when the clean gas enters the high-pressure clean gas main pipe 21, the clean gas is controlled by the dust remover outlet gate valve 8 and the dust remover outlet butterfly valve 7.

And the pressure relief branch pipe 9 is provided with a pressure relief branch pipe butterfly valve 10 and a pressure relief branch pipe blind plate valve 11, and the pressure relief branch pipe butterfly valve 10 and the pressure relief branch pipe blind plate valve 11 perform pressure relief.

The injection gas pipeline 15 is provided with an injection gas butterfly valve 13, an injection gas blind plate valve 14 and an injection valve 16, and the injection gas butterfly valve 13, the injection gas blind plate valve 14 and the injection valve 16 control the size, direction and start and stop of injection gas flow.

And an ejector outlet blind plate valve 18 and an ejector outlet butterfly valve 19 are arranged on the ejector outlet pipe 20, and the direction and the size of the ejection outlet gas are controlled by the ejector outlet blind plate valve 18 and the ejector outlet butterfly valve 19.

The working principle of the invention is as follows: the pressure relief pipeline and the pressure relief valve of sack cleaner box exit linkage, the pressure relief is responsible for and is equipped with the ejector, the injection air supply of ejector comes from high-pressure clean gas pipeline, under the suction effect of ejector, can be quick with the internal gas pressure of dust remover case drop to low pressure gas pipe network pressure, then close the injection valve, open dust remover export butterfly valve, high-pressure gas in the high-pressure gas pipe network flows backward to the dust remover box through the export butterfly valve, make the internal sack shake of box, realize the purpose of deashing. The blast furnace gas sack cleaner increases along with the sack filter dust volume, the pressure differential increases inside and outside the sack, when influencing the dust remover normal filtration gradually, the deashing needs, at this moment, close dust remover entry butterfly valve and export butterfly valve, open the pressure release butterfly valve, high-pressure gas in the dust remover box can flow to the low pressure gas house steward through the pressure release pipeline under the condition of pressure differential in nature, however, only through pressure differential, this flow process goes on fairly slowly, influence the next step of filtration of dust remover, therefore, set up the ejector on the pressure release pipeline, install the ejector valve before the ejector, the effect of ejector can reduce the high-pressure gas of 0.2MPa of ejector induction port to 10kPa or below rapidly. After the pressure in the dust collector box body is reduced to be below 10kPa, the injection valve and the pressure relief butterfly valve are closed, the outlet butterfly valve of the dust collector is opened, high-pressure clean gas in a high-pressure clean gas main pipe can rapidly enter the dust collector box body through the outlet butterfly valve of the dust collector, the pressure in the dust collector box body is rapidly and sharply increased in a short time, the pressure in a clean gas chamber of the dust collector box body is instantaneously higher than a dust gas chamber due to the resistance of a cloth bag, so that the cloth bag is expanded and shaken, dust is deposited to fall into a dust hopper under the action of gravity, the dust cleaning process is completed, and finally, the inlet butterfly valve of the cloth bag dust collector box body is opened, and.

The present invention and its embodiments have been described, without limitation, and the embodiments shown in the drawings are only one embodiment of the present invention, and the actual configuration is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.