CN111378802A

CN111378802A - Longitudinal online leakage detection method for cooling wall of blast furnace

Info

Publication number: CN111378802A
Application number: CN201811651441.2A
Authority: CN
Inventors: 任贵河; 王宗乐; 张文庆; 李刚义; 舒艺
Original assignee: Xinjiang Bayi Iron and Steel Co Ltd
Current assignee: Xinjiang Bayi Iron and Steel Co Ltd
Priority date: 2018-12-31
Filing date: 2018-12-31
Publication date: 2020-07-07

Abstract

The invention discloses a blast furnace cooling wall longitudinal on-line leak detection method, when a blast furnace is normal, if a soft water cooling system has water leakage signs, a 1 st section cooling wall water inlet valve in a region where water leakage is possible is closed, then a 16 th section cooling wall water outlet valve is closed, an exhaust valve on a 16 th section cooling wall water outlet pipeline is opened, and the water outlet condition of the exhaust valve is observed, wherein the first cooling wall is normally free from damage, the exhaust valve is opened, and no water or gas leaks after residual water on the upper part of the pipeline is emptied; the second kind of cooling wall has a damaged phenomenon that the exhaust valve is opened, after the residual water on the upper part of the pipeline is emptied, the soft water in the pipeline on the lower part of the exhaust valve continuously leaks, then the gas-water mixture leaks, and finally the gas leaks, and the gas is detected by using a gas alarm instrument and confirmed to be gas, so that the longitudinal damaged condition of the cooling wall can be accurately judged.

Description

Longitudinal online leakage detection method for cooling wall of blast furnace

Technical Field

The invention relates to a longitudinal online leakage detection method for a cooling wall of a blast furnace.

Background

The eight-steel new area A, B blast furnace adopts the observation flap flowmeter bubble technology of the invention in the earlier stage to perform the longitudinal on-line leak detection of the cooling wall of the blast furnace. However, the flap plate flowmeter on the return water pipeline of the cooling wall at the 16 th section of the blast furnace C cannot perform leak detection according to the method: the plate turnover flow meter disc surface of the C blast furnace is made of resin, and the soft water is high in temperature, so that the resin is deformed, the inner surface is fuzzy, and the soft water cannot be normally observed to determine whether bubbles exist. In addition, the existing bubble technology of the observation flap flowmeter has the possibility of misjudgment in the aspect of leakage detection of the cooling wall. In the first case: when the local area temperature of the blast furnace cooling wall is overhigh, the cooling water is vaporized instantly, and bubbles can also appear in the circulating water. In the second case: when the atomization cooling maintenance is carried out on the damaged cooling wall, if the valve is not closed tightly, nitrogen or compressed air and other gases are mixed into the cooling water, and bubbles can also appear in the circulating water. In the two cases, even if the cooling wall is not damaged, bubbles can be observed in the flap flowmeter on the section 16 cooling wall water return pipeline.

Disclosure of Invention

The invention aims to provide a method for detecting the longitudinal online leakage of a blast furnace cooling wall, which has the advantages of convenient operation, accurate judgment and no erroneous judgment.

The invention aims to realize the method, when a blast furnace is normal, if a soft water cooling system has water leakage, a water inlet valve of the cooling wall at the 1 st section, which possibly has a water leakage area, of a soft water cooling system is sequentially and respectively closed, then a water outlet valve of the cooling wall at the 16 th section is closed, an exhaust valve on a water outlet pipeline of the cooling wall at the 16 th section is opened, the water outlet condition of the exhaust valve is observed, and the first cooling wall is normally free from damage, namely, the exhaust valve is opened, and after residual water at the upper part of the pipeline is emptied, no water and gas leak out; the second kind of cooling wall has a damaged phenomenon that the exhaust valve is opened, after the residual water on the upper part of the pipeline is emptied, the soft water in the pipeline on the lower part of the exhaust valve continuously leaks, then the gas-water mixture leaks, and finally the gas leaks, and the gas is detected by using a gas alarm instrument and confirmed to be gas, so that the longitudinal damaged condition of the cooling wall can be accurately judged.

The leakage detection principle of the blast furnace cooling wall longitudinal online leakage detection technology is as follows: when the blast furnace is normally produced, the pressure distribution of coal gas in the furnace is as follows: the gas pressure of the cooling wall (the elevation is about 13 m) at the 5 th section, namely the air inlet area, is about 0.36MPa, the gas pressure of the cooling wall (the elevation is about 28 m) at the 10 th section is about 0.28 MPa, and the gas pressure in the furnace is about 0.25 MPa when the gas rises to the cooling wall (the elevation is about 36 m) at the 16 th section due to the pressure loss in the process that the gas pressure in the furnace passes through the furnace burden to rise. The pressure of the soft water cooling water of the 10 th cooling wall (the elevation is about 28 m) is about 0.25 MPa, and the pressure of the cooling water of the 16 th cooling wall is about 0.15 MPa. Because the pressure of the coal gas in the furnace at the middle upper part of the furnace body is higher than the pressure of the cooling water of the cooling wall, if a certain cooling wall is damaged and leaks water, the water inlet and outlet valves of the cooling water pipe of the longitudinal cooling wall are closed, and after the tail end, namely the exhaust valve of the 16 th section cooling wall, is opened, the coal gas in the furnace passes through the damaged part of the cooling wall and enters the cooling water pipe, so that the cooling water in the cooling water pipe is extruded out.

Drawings

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

FIG. 1 is a schematic front view showing the structure of a stave cooler of a blast furnace according to the present invention.

In the figure, 1 is a water inlet valve of a cooling water pipe of the cooling wall of the 1 st section; in the figure 2, an exhaust valve on a connecting pipe between two adjacent sections of cooling wall cooling water pipes is positioned on a cooling wall water inlet cooling water pipe on the upper section of the cooling wall; in the figure, 3 is a cooling water pipe valve for the outlet water of the cooling wall at the 16 th section; and 4 in the figure is an exhaust leak detection valve on a cooling water outlet pipe of the cooling wall of the 16 th section.

Detailed Description

A method for detecting the leakage of a blast furnace cooling wall in a longitudinal online manner is disclosed, as shown in figure 1,

1) when the blast furnace is normal, if the soft water cooling system has the sign of water leakage, the cooling wall is used for carrying out the leakage detection operation by using the cooling wall longitudinal on-line leakage detection technology.

2) Assuming that the 20 th to 40 th stave cooling water pipes are damaged and leak water in preliminary judgment, the water inlet valve 1 of the 1 st stave 20 th cooling water pipe is closed first, then the water outlet valve 3 of the 16 th stave 20 th stave cooling water pipe is closed, the exhaust leak detection valve 4 on the 16 th 20 th stave water outlet pipeline is opened, and the water outlet condition of the exhaust leak detection valve 4 is observed.

3) If the exhaust leak detection valve 4 on the 16 th section No. 20 cooling wall water outlet pipeline is opened, no water and gas leak out after the residual water on the upper part of the pipeline is emptied. The cooling water pipe of the No. 20 cooling wall is normally circulated, and the phenomenon of breakage and water leakage does not occur.

4) If the exhaust leakage detection valve 4 on the 16 th section No. 20 cooling wall water outlet pipeline is opened, after residual water on the upper part of the pipeline is emptied, soft water in the lower pipeline of the exhaust leakage detection valve continuously leaks, then a gas-water mixture leaks, and finally gas leaks, the gas leakage is detected by using a gas alarm instrument and is confirmed to be gas, so that the longitudinal damage and water leakage condition on the No. 20 cooling wall cooling water pipeline can be accurately judged.

5) And by analogy, the leakage detection tests are respectively carried out on the cooling water pipes of the No. 20 to the No. 40 cooling walls one by one, and the damaged cooling water pipes of the longitudinal cooling walls can be quickly confirmed.

6) The blast furnace C successfully checks and confirms the longitudinal damage and water leakage of the No. 134 cooling wall cooling water pipe and the 1 st cooling wall cooling water pipe found from the start-up production of the blast furnace C.

Claims

1. A blast furnace cooling wall longitudinal on-line leakage detection method is characterized in that: when the blast furnace is normal, if the soft water cooling system has water leakage, sequentially and respectively closing a water inlet valve (1) of a 1 st section cooling wall in a region where water leakage is possible, then closing a water outlet valve (3) of a 16 th section cooling wall, opening an exhaust valve (4) on a water outlet pipeline of the 16 th section cooling wall, and observing the water outlet condition of the exhaust valve (4), wherein the first cooling wall is normally free of damage, the exhaust valve (4) is opened, and no water or gas leaks after residual water on the upper part of the pipeline is emptied; the second cooling wall has the phenomenon that the exhaust valve (4) is opened, after residual water on the upper part of the pipeline is emptied, soft water in the pipeline on the lower part of the exhaust valve continuously leaks, then a gas-water mixture leaks, and finally gas leaks, and the gas is detected by using a gas alarm instrument and confirmed to be gas, so that the longitudinal damage condition of the cooling wall can be accurately judged.