Device for conveying ash by using blast furnace clean gas in blast furnace dry dedusting

Abstract

The utility model discloses a device for conveying ash by using blast furnace clean gas during dry dedusting of a blast furnace, which comprises a high-pressure clean gas main pipe, a first pipeline, an ash conveying pipeline, a dry dedusting box body, an ash storage bin, a top recycling pipeline and a low-pressure clean gas main pipe, a ball valve, a blind plate valve and a pressure reducing valve are sequentially arranged on the first pipeline in the gas conveying direction. An upper ball valve, a bell valve and a lower ball valve are sequentially arranged on a pipeline for connecting the dry dedusting box body and the ash conveying pipeline, the other end of the ash conveying pipeline is connected with the ash storage bin, the ash storage bin is connected with the top recycling pipeline, the top recycling pipeline is connected with the low-pressure clean gas main pipe, and the low-pressure clean gas main pipe is connected with the dry dedusting box body. A blind plate valve and a ball valve are sequentially arranged on the top recycling pipeline in the gas conveying direction. According to the utility model, the energy consumption can be greatly reduced, and the pollution to the environment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace dust removal, in particular to a blast furnace dry dust removal device using blast furnace clean coal gas to transport ash. Background Art

[0002] At present, the blast furnace gas dry dust removal system adopts low-pressure nitrogen for gas transportation in the box body, and transports the gas ash to the ash storage bin. When the box body transports ash, a large amount of gas, nitrogen and dust ash are mixed and enter the ash storage bin. After the dust ash mixed gas is filtered by the ash storage bin filter bag, the dust ash falls to the bottom of the ash storage bin. The nitrogen and gas mixed gas is discharged into the air through the release valve, which will cause certain pollution to the environment. Among them, the proportion of the mixed gas discharged is: nitrogen 75%, gas 25% (almost no use value); a single blast furnace using nitrogen ash transportation consumes 3500m3 of nitrogen per day. 3 Around, blast furnace gas is discharged into the air 1000m 3 Left and right, wasting energy.

[0003] (1) During the normal production of the blast furnace, the dry dust removal box must be discharged 2-3 times a day. During the nitrogen unloading process, a mixed gas of nitrogen, coal gas and fine dust will be continuously discharged into the air, which not only wastes energy but also causes certain pollution to the environment.

[0004] (2) Nowadays, steel enterprises have continuously raised their requirements for environmental protection. Failure to meet environmental protection standards will affect the normal production of the company, especially in autumn and winter when production restrictions seriously disrupt normal production order. In winter, due to the lower temperature, the sintered ore entering the blast furnace is at a low temperature and contains a large amount of powder, which limits the dust removal and ash discharge of the box gas. When the moisture content of light ash is high, the temperature of the pipeline is reduced, and the ash is easily condensed into lumps, causing blockage. When dismantling the pipeline, the labor intensity is high, and the operation in the gas area is dangerous. Nitrogen consumption increases, resulting in energy waste and increased energy costs. Utility Model Content

[0005] In order to solve the shortcomings and deficiencies of the prior art, a device for blast furnace dry dust removal using blast furnace clean coal gas to convey ash is provided, which can greatly reduce energy consumption and reduce pollution to the environment.

[0006] In order to achieve the purpose of the utility model, a device for blast furnace dry dust removal using blast furnace clean gas to convey ash is provided, comprising a high-pressure clean gas main, a first pipeline, an ash conveying pipeline, a dry dust removal box, an ash storage bin, a top recovery pipeline and a low-pressure clean gas main, wherein the two ends of the first pipeline are respectively connected to the high-pressure clean gas main and the ash conveying pipeline, and a ball valve, a blind plate valve and a pressure reducing valve are sequentially arranged on the first pipeline along the gas conveying direction; an upper ball valve, a bell valve and a lower ball valve are sequentially arranged on the pipeline connecting the dry dust removal box and the ash conveying pipeline, the other end of the ash conveying pipeline is connected to the ash storage bin, the ash storage bin is connected to the top recovery pipeline, the top recovery pipeline is connected to the low-pressure clean gas main, and a blind plate valve and a ball valve are sequentially arranged on the top recovery pipeline along the gas conveying direction.

[0007] The beneficial effects of the utility model are:

[0008] Compared with the prior art, the utility model provides a device for conveying ash by using clean coal gas from blast furnace for dry dust removal of blast furnace. The high-pressure clean coal gas main for dry dust removal is sent into the ash conveying pipeline, and the dust mixed with coal gas is sent into the ash conveying pipeline from the upper ball valve, bell valve and lower ball valve of the single box body. The dust mixed gas in the ash conveying pipeline is sent into the ash storage bin, where the dust falls into the bottom of the ash storage bin, and the coal gas is sent into the low-pressure clean coal gas main through the recovery pipeline at the top of the ash storage bin.

[0009] The utility model can significantly reduce energy consumption and reduce environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the structure of the existing blast furnace dry dust removal. DETAILED DESCRIPTION

[0013] like Figure 1As shown, the utility model provides a device for blast furnace dry dust removal using blast furnace clean gas to convey ash, comprising a high-pressure clean gas main 1, a first pipeline 2, an ash conveying pipeline 3, a dry dust removal box 4, an ash storage bin 5, a top recovery pipeline 6 and a low-pressure clean gas main 7, the two ends of the first pipeline 2 are respectively connected to the high-pressure clean gas main 1 and the ash conveying pipeline 3, and a ball valve, a blind plate valve and a pressure reducing valve are sequentially arranged on the first pipeline 2 along the gas conveying direction; an upper ball valve, a bell valve and a lower ball valve are sequentially arranged on the pipeline connecting the dry dust removal box 4 and the ash conveying pipeline 3, the other end of the ash conveying pipeline 3 is connected to the ash storage bin 5, the ash storage bin 5 is connected to the top recovery pipeline 6, the top recovery pipeline 6 is connected to the low-pressure clean gas main 7, and a blind plate valve and a ball valve are sequentially arranged on the top recovery pipeline 6 along the gas conveying direction.

[0014] like Figure 2 As shown, the technical solution changes the previous dry dust removal method of the blast furnace. The original dust removal method is as follows: "The nitrogen pipe network 100 is transported to the nitrogen tank 200, and finally transported to the ash conveying pipeline 3. The dust mixed with coal gas is sent to the ash conveying pipeline 3 from the upper ball valve, bell valve, and lower ball valve of the single box. After that, the dust mixed gas is sent to the ash storage bin 5, wherein the dust falls into the bottom of the ash storage bin 5, and the nitrogen and coal gas mixed gas is discharged to the air through the release valve 300".

[0015] The ash conveying gas source is replaced by high-pressure coal gas from low-pressure nitrogen, and the mixed gas discharged into the air can be 100% recovered to the low-pressure clean coal gas main 7, which can not only avoid the consumption of nitrogen used for ash conveying, but also effectively control the discharge of residual mixed gas into the air and reduce carbon emissions.

[0016] The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments can be combined with each other to form new embodiments. The above embodiments are only used to illustrate the technical solutions of the utility model and are not intended to limit them. Any modification or equivalent replacement that does not deviate from the spirit and scope of the utility model shall be included in the scope of the technical solution of the utility model.

Claims

1. A device for blast furnace dry dust removal using blast furnace clean coal gas to transport ash, characterized in that: It includes a high-pressure clean gas main, a first pipeline, an ash conveying pipeline, a dry dust removal box, an ash storage bin, a top recovery pipeline and a low-pressure clean gas main. The two ends of the first pipeline are respectively connected to the high-pressure clean gas main and the ash conveying pipeline. A ball valve, a blind plate valve and a pressure reducing valve are sequentially arranged on the first pipeline along the gas conveying direction; an upper ball valve, a bell valve and a lower ball valve are sequentially arranged on the pipeline connecting the dry dust removal box and the ash conveying pipeline. The other end of the ash conveying pipeline is connected to the ash storage bin, the ash storage bin is connected to the top recovery pipeline, the top recovery pipeline is connected to the low-pressure clean gas main, and a blind plate valve and a ball valve are sequentially arranged on the top recovery pipeline along the gas conveying direction.

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