CN215799680U

CN215799680U - Dry-method dust removal system suitable for water-containing low-temperature coal gas

Info

Publication number: CN215799680U
Application number: CN202121395009.9U
Authority: CN
Inventors: 牛潇; 洪曙; 高卓军; 胡培; 陈飞; 王同英
Original assignee: Baowu Group Echeng Iron and Steel Co Ltd
Current assignee: Baowu Group Echeng Iron and Steel Co Ltd
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2022-02-11
Anticipated expiration: 2031-06-23

Abstract

The utility model relates to a dry dedusting system suitable for water-containing low-temperature coal gas, which comprises a dry dedusting box, wherein a discharge pipe is arranged at the bottom of the dry dedusting box, a bin pump is arranged at the bottom end of the discharge pipe, a feeding valve is arranged on the discharge pipe, a nitrogen inlet and a discharge pipe are arranged on the bin pump, a discharge valve is arranged on the discharge pipe, and the outer end of the discharge pipe is connected with an ash bin through a conveying pipeline; when the coal gas containing moisture is dried, the utility model can effectively avoid agglomeration and blockage, and can be suitable for drying low-temperature coal gas.

Description

Dry-method dust removal system suitable for water-containing low-temperature coal gas

Technical Field

The utility model relates to the technical field of blast furnace production, in particular to a dry dedusting system suitable for water-containing low-temperature coal gas.

Background

The dust content of gas discharged from the top of the blast furnace in blast furnace production is 10-40 g/Nm3, and if dust removal and cleaning are not carried out, the gas has no use value, because a large amount of dust-containing gas can block lattice bricks of a combustion chamber of a chemical coke oven, lattice bricks of a heat storage chamber of a blast furnace hot blast stove, burners of a heating furnace of a steel mill and igniters of a sintering machine when burning, and meanwhile, pipeline blockage can be caused in the long-distance conveying process, the pipe wall is washed and corroded, so that the maintenance amount of the whole system is increased, and even the production is influenced.

With the development of the steel industry, most steel enterprises adopt a blast furnace gas dry dedusting process, and some enterprises adopt a mode of combining a dry dedusting process and a wet dedusting process. Compared with wet dust removal, the blast furnace gas dry dust removal not only simplifies the process system, fundamentally solves the problems of secondary water pollution and sludge treatment, but also can obtain good effects of recovering physical heat of the gas, saving water and saving electricity, can obviously improve the power generation level by matching with dry TRT, and also supports the technical route of energy conservation, emission reduction and environmental protection by the national command. The biggest defect of dry dust removal is that the dust conveying mode can ensure that the dust removing system can only ensure the normal work when the temperature of the raw gas from the blast furnace is between 100 ℃ and 260 ℃, and when the raw gas is opposite to the low-temperature gas with the water content of less than 100 ℃, valves and pipelines are easy to block, so that the whole dust conveying system is broken down.

Disclosure of Invention

The utility model aims to solve the problem that a pipeline or equipment is blocked due to easy caking in the dust removal process of water-containing coal gas, and provides a dry dust removal system suitable for water-containing low-temperature coal gas.

The specific scheme of the utility model is as follows: the utility model provides a dry process dust pelletizing system suitable for moisture low temperature coal gas, includes the dry process dust removal case, and dry process dust removal bottom of the case portion is equipped with the delivery pipe, and a storehouse pump is equipped with on the delivery pipe, is equipped with the feed valve on the delivery pipe, is equipped with nitrogen gas entry and discharge tube on the storehouse pump, is equipped with the discharge valve on the discharge tube, and the discharge tube outer end is connected with an ash bin through pipeline.

The conveying pipeline is provided with an elbow at a turning position, a section of by-pass pipe is arranged at the elbow, and a detachable movable maintenance board is arranged at the end part of the by-pass pipe.

A pressure sensor is arranged in the bin pump, an electric control valve is arranged at a nitrogen inlet, and the pressure sensor is in signal connection with the electric control valve.

The input end of the dry dust removal box is provided with the gravity dust remover, and the input end of the gravity dust remover is connected with a coal gas outlet of a blast furnace.

The dry dust removal box is a cyclone dust remover.

The working principle of the utility model is as follows: the blast furnace raw gas passes through a gravity dust collector and then reaches a dry dust removal box body, nitrogen back blowing is carried out in the dry dust removal box body every 2 hours, after back blowing, dust in the raw gas is blown into a bin pump through a feeding valve, then the feeding valve is closed, the bin pump is charged with nitrogen for pressurization, when the pressure in the bin pump is larger than 300kpa, the feeding valve is opened, the pressure in the bin pump is enabled to collide with the gas pressure in the dry dust removal box body, block crystals in the bin pump collide with the block crystals falling in the box body, the operation is repeated for 3-5 times, the size of the block crystals can be effectively reduced, finally, the feeding valve is closed again for pressurization, and after the pressure reaches 300kpa, a discharging valve is opened to enable the bin pump to instantly release pressure and convey ash to an ash bin.

The utility model has the following beneficial effects: 1. when the coal gas containing moisture is dried, caking and blockage can be effectively avoided, and the method is suitable for drying the low-temperature coal gas; 2. the bypass pipe is arranged at the position of the elbow which is easy to block of the conveying pipeline, when the blockage occurs, the movable maintenance plate is conveniently and quickly opened to dredge, and the maintenance difficulty is reduced.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

in the figure: 1-blast furnace, 2-gravity dust collector, 3-dry dust collection box, 4-feed valve, 5-bin pump, 6-discharge valve, 7-elbow, 8-bypass pipe, 9-movable maintenance board, 10-nitrogen inlet, 11-ash bin and 12-conveying pipeline.

Detailed Description

Referring to fig. 1, the embodiment is a dry dedusting system suitable for water-containing low-temperature coal gas, which comprises a gravity deduster 2 connected with a coal gas outlet of a blast furnace 1, wherein an outlet of the gravity deduster 2 is connected with a dry dedusting box 3, a discharge pipe is arranged at the bottom of the dry dedusting box 3, a bin pump 5 is arranged at the bottom end of the discharge pipe, a feeding valve 4 is arranged on the discharge pipe, a nitrogen inlet 10 and a discharge pipe are arranged on the bin pump 5, a discharge valve 6 is arranged on the discharge pipe, and the outer end of the discharge pipe is connected with an ash bin 11 through a conveying pipeline 12.

In the embodiment, the conveying pipeline 12 is provided with an elbow 7 at a turning position, a section of by-pass pipe 8 is arranged at the elbow 7, and the end part of the by-pass pipe 8 is provided with a detachable movable access panel 9.

In the embodiment, a pressure sensor is arranged in the bin pump 5, an electric control valve is arranged at the nitrogen inlet 10, the pressure sensor is in signal connection with the electric control valve, when the pressure sensor detects that the pressure in the bin pump 5 reaches 300kpa, a signal is sent to the electric control valve, and the bin pump is automatically closed to stop filling nitrogen.

The dry dust removal box 3 described in this embodiment is a cyclone dust remover.

Claims

1. A dry dedusting system suitable for water-containing low-temperature coal gas comprises a dry dedusting box and is characterized in that: the bottom of the dry method dust removal box is provided with a discharge pipe, the bottom end of the discharge pipe is provided with a bin pump, the discharge pipe is provided with a feed valve, the bin pump is provided with a nitrogen inlet and a discharge pipe, the discharge pipe is provided with a discharge valve, and the outer end of the discharge pipe is connected with an ash bin through a conveying pipeline; and a pressure sensor is arranged in the bin pump, an electric control valve is arranged at the nitrogen inlet, and the pressure sensor is in signal connection with the electric control valve.

2. The dry dedusting system for low-temperature gas containing water as set forth in claim 1, wherein: the conveying pipeline is provided with an elbow at the turning position, a section of by-pass pipe is arranged at the elbow, and a detachable movable maintenance board is arranged at the end part of the by-pass pipe.

3. The dry dedusting system for low-temperature gas containing water as set forth in claim 1, wherein: the input end of the dry dust removal box is provided with a gravity dust remover, and the input end of the gravity dust remover is connected with a coal gas outlet of the blast furnace.

4. A dry dedusting system suitable for low-temperature gas containing water according to any one of claims 1 to 3, which is characterized in that: the dry dust removal box is a cyclone dust remover.