CN113430316B

CN113430316B - Online drainage device and drainage method for blast furnace shell

Info

Publication number: CN113430316B
Application number: CN202110633064.5A
Authority: CN
Inventors: 向宏宇; 陆永定; 张�杰; 杨建伟
Original assignee: Shanxi Taigang Stainless Steel Co Ltd
Current assignee: Shanxi Taigang Stainless Steel Co Ltd
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2022-11-25
Anticipated expiration: 2041-06-07
Also published as: CN113430316A

Abstract

An on-line drainage device for a blast furnace shell and a drainage method thereof belong to the field of metallurgy, and the drainage device comprises a stainless steel separation net, a high-temperature resistant particle-grade permeable layer, a carbon heat conduction layer, a drainage pipeline and a drainage valve, wherein the stainless steel separation net is arranged on the inner wall of the furnace shell; the high-temperature resistant granular-grade permeable layer is tightly attached to the stainless steel separation net, and the carbon heat conduction layer is tightly attached to the high-temperature resistant granular-grade permeable layer; the water discharge pipes are arranged at the position 50 mm above the elevation of the bottom plate of the blast furnace shell and are uniformly distributed along the furnace shell, and the water discharge valves are arranged on the water discharge pipes. The invention realizes the function that operators can freely complete on-line drainage under the action of gravity and pressure in the furnace on the premise of not damaging refractory materials. Not only avoids the damage of refractory materials of the hearth and achieves the effect of safe production, but also can not increase redundant equipment, so that the hearth of the furnace bottom and the hearth are more stable, safer and longer in service life.

Description

Online drainage device and drainage method for blast furnace shell

Technical Field

The invention relates to a blast furnace, in particular to a drainage device and a drainage method in the online production process of a blast furnace shell.

Background

An air gap exists between a furnace shell at the bottom of the blast furnace and the carbon ramming material and the carbon bricks, partial free water and steam can be gathered at the bottom of the furnace under the long-term action of high-pressure gas pressure and high-temperature thermal stress in the furnace, so that the carbon bricks are cracked, the heat conductivity of the carbon ramming material is attenuated, molten iron corrodes along an airflow channel to cause damage to refractory materials at the bottom of the furnace, and the safety production is seriously threatened. Therefore, the function of online drainage needs to be provided in the limited space of the blast furnace.

Disclosure of Invention

In order to reduce the damage of air gaps, water and steam to refractory materials of a hearth and reduce the probability of molten iron corrosion, the invention provides an online drainage device and a drainage method for a blast furnace shell.

The technical scheme of the invention is as follows: an online drainage device for a blast furnace shell is arranged between a cooling wall and a furnace bottom annular plate of the blast furnace shell at an inclination angle of 45 degrees and is characterized by comprising a stainless steel separation net, a high-temperature-resistant particle-grade permeable layer, a carbon heat conduction layer, a drainage pipe and a drainage valve, wherein the stainless steel separation net is arranged on the inner wall of the furnace shell; the high-temperature resistant granular-grade permeable layer is tightly attached to the stainless steel separation net, and the carbon heat conduction layer is tightly attached to the high-temperature resistant granular-grade permeable layer; the drainage pipelines are arranged at the position 50 mm above the elevation of the bottom plate of the blast furnace shell and are uniformly distributed along the furnace shell, and the drainage valves are arranged on the drainage pipelines; the aperture of the mesh of the stainless steel isolation net is 0.5mm; the high-temperature resistant granular permeable layer is made of 3-5 mm high-alumina granular aggregate.

A blast furnace shell on-line drainage method is characterized in that twelve drainage pipes are uniformly distributed along a furnace shell at 50 mm positions above the elevation of a bottom plate of the blast furnace shell, and water vapor enters a gap between a material ramming at the furnace bottom and a cooling wall and reaches the lower part of the furnace shell to be gathered by free condensate water through a stainless steel separation net with the aperture of 0.5mm, a high-temperature resistant particle-grade water permeable layer and a carbon heat conduction layer; and is discharged through twelve water discharge pipes uniformly distributed at the bottom of the furnace. The on-line drainage is completed by operators, so that the damage of air gaps, water, steam, alkali metal vaporization and the like generated by abnormal reasons of the blast furnace hearth under a high-strength working condition to the refractory materials of the furnace bottom and the hearth is greatly reduced, the probability of molten iron corrosion is reduced, and the long-period balance capability of the refractory heat conduction system of the hearth system is improved.

Under the action of gravity and pressure in the furnace, the invention can realize the function that operators can freely complete online drainage on the premise of not damaging refractory materials, thereby prolonging the service life of the hearth and the hearth of the furnace bottom.

The invention realizes the function of discharging the condensed water at the bottom of the blast furnace in the production state on the premise of meeting the requirements of high pressure resistance, high temperature resistance and good heat conduction performance. Through the structural arrangement of a stainless steel net with the aperture of 0.5mm, a grain-sized material and a carbon ramming material, the gathering of free condensed water at the lower part of the furnace shell is achieved. Because the surface temperature of the furnace shell at the lower part of the cooling wall is low, the free condensed water and the water vapor at the lower part of the furnace shell are gathered, when a certain enrichment degree is reached, an operator finishes on-line drainage, air gaps, water vapor and the like are reduced, the damage to refractory materials of a hearth is reduced, and the probability of molten iron erosion is reduced.

Detailed Description

An on-line drainage device for blast furnace shell is arranged between cooling wall and furnace bottom ring plate, and is connected with furnace shell by pipeline. The stainless steel separation net is arranged on the inner wall of the furnace shell and is used for collecting condensed water in the furnace to the drainage channel; the granular level permeable layer is tightly attached to the stainless steel separation net, the height of the stacking angle of 45 degrees exceeds the elevation of the water outlet by 50 mm, and the granular level permeable layer has the function of condensing water and steam between the furnace shell and the cooling wall at the annular air channel at the bottom of the furnace due to low temperature; the carbonaceous coupling layer connects the granular permeable layers together, a water-vapor combination passage is formed on the outer side, and the inner side has good heat conduction performance and transmits high temperature to the cooling wall to finish heat exchange. The heat conducting layer is a silicon carbide ramming material with high heat conductivity coefficient and has good molten iron resistance and slag corrosion resistance. The air flow of the original furnace hearth air gap pore canal can not be expanded when water is drained in the normal production process, and the carbon brick is protected.

The partial drainage pipeline outside the blast furnace adopts a steel pipe with the diameter of 50 mm, the installation angle is 10 degrees, the outer side is low, and collected condensed water is ensured not to flow back into the furnace. The drain valve has the steam exhaust function, and the stainless steel ball valve with the pressure grade of 10 kilograms is arranged on the outer side of the drain pipe. The requirement of quick switching under the conditions of high humidity and high voltage is met.

A blast furnace shell online drainage method is characterized in that twelve drainage pipes are uniformly distributed along a furnace shell at 50 mm positions above the elevation of a bottom plate of the blast furnace shell, most of generated water vapor is taken away by upper coal gas flow in the production process of the blast furnace, and a small amount of water vapor enters a gap between a furnace bottom material smashing and a cooling wall and passes through a stainless steel separation net with the aperture of 0.5mm, a high-temperature resistant particle level water permeable layer and a carbon heat conducting layer to reach the lower part of the furnace shell to be gathered by free condensate water; and is discharged through twelve water discharge pipes.

Claims

1. An online drainage device for a blast furnace shell is arranged between a cooling wall of the blast furnace shell and a furnace bottom annular plate at an inclination angle of 45 degrees and is characterized by comprising a stainless steel separation net, a high-temperature resistant particle-grade water permeable layer, a carbon heat conducting layer, a drainage pipe and a drainage valve, wherein the stainless steel separation net is arranged on the inner wall of the furnace shell; the high-temperature resistant granular-grade permeable layer is tightly attached to the stainless steel separation net, and the carbon heat conduction layer is tightly attached to the high-temperature resistant granular-grade permeable layer; the drainage pipelines are arranged at the position 50 mm above the elevation of the bottom plate of the blast furnace shell and are uniformly distributed along the furnace shell, and the drainage valves are arranged on the drainage pipelines; the aperture of the mesh of the stainless steel isolation net is 0.5mm; the high-temperature resistant granular permeable layer is made of 3-5 mm high-aluminum granular aggregate; the drainage pipeline has an inclined angle of 10 degrees, the outer side is lower, and the inner side is higher; the water vapor enters the gap between the furnace bottom ramming material and the cooling wall and reaches the lower part of the furnace shell through the stainless steel separation net, the high temperature resistant granular permeable layer and the carbon heat conduction layer to be gathered with free condensed water; the condensed water is discharged through twelve water discharge pipes uniformly distributed at the bottom of the furnace.