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A Method for Blast Furnace Low Pressure Blowing and Cutting Coal Gas Shutdown

A blast furnace and gas technology, which is applied in the field of blast furnace low-pressure release, cutting, and gas suspension, can solve the problems of cumbersome operation and low practicability.

Active Publication Date: 2021-03-30
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

China Invention Patent (Application No.: 201510303149.1, Application Date: 2015-06-07) open class is a blast furnace low-pressure exhaust air cutting gas shutdown method. Although this method can reduce part of the blast furnace gas emission, there is still a large amount The blast furnace gas is discharged into the air, and the method is relatively cumbersome to operate, and the industrial implementation is low

Method used

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  • A Method for Blast Furnace Low Pressure Blowing and Cutting Coal Gas Shutdown

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for blast furnace low-pressure release and gas cut-off, the actual operation steps are as follows:

[0035] An effective volume of 3200m 3 The off-wind of the blast furnace:

[0036] (1) Reduce the air volume in the blast furnace to about 1600m 3 Before / min, hot air pressure 0.100mpa, and top pressure 0.030mpa, high-pressure steam is passed to the top of the blast furnace, and the steam pressure is 0.4mpa.

[0037] (2) Continue to reduce the wind and pressure until the air volume is 0, the hot air pressure is 0.050mpa, and the furnace top pressure is 0.010mpa.

[0038] (3) Open the sprinkling valve on the top of the furnace to sprinkle water on the surface of the material. The time to open the sprinkling valve on the top of the furnace is about 5-10s, and the top temperature will drop below 100°C.

[0039] (4) Open the relief valve on the top of the furnace, and then close the gas shut-off valve.

[0040] (5) Notify the hot blast stove post, close the cold...

Embodiment 2

[0043] The effective volume of a blast furnace is 2200m 3 The off-wind of the blast furnace:

[0044] (1) Reduce the air volume in the blast furnace to about 1100m 3 Before / min, wind pressure 0.100mpa, and top pressure 0.030mpa, high-pressure steam is passed to the top of the blast furnace, and the steam pressure is 0.4mpa.

[0045] (2) Continue to reduce the wind and pressure until the air volume is 0, the hot air pressure is 0.050mpa, and the furnace top pressure is 0.010mpa.

[0046] (3) Open the sprinkling valve on the top of the furnace to sprinkle water on the material surface. The time to open the sprinkling valve on the top of the furnace is about 10s, and the top temperature will drop below 100°C.

[0047] (4) Open the relief valve on the top of the furnace, and then close the gas shut-off valve.

[0048] (5) Notify the post of the hot blast stove, close the cold air valve and hot air valve of the blast stove, and complete the shutdown operation.

[0049]Effect: ...

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Abstract

The invention discloses a method for blast furnace low pressure emission, gas cutoff and blowing-down. The method comprises the following steps of (1), injecting high pressure steam into the furnace top of a blast furnace when the blast furnace reduces the air pressure to that the hot air pressure is 0.120-0.100 MPa and the furnace top pressure is 0.040-0.030 MPa; (2), continuing to reduce the airpressure of the blast furnace until the blast furnace air volume is 0, the hot air pressure is 0.050 MPa and the furnace top pressure is 0.010 MPa; (3), opening a charging surface sprinkling valve onthe furnace top (opening time is 5-10 seconds, depending on the temperature of the furnace top), carrying out charging surface sprinkling, and stop the charging surface sprinkling after lowering thetemperature of the furnace top to 100 DEG C or below so as to reduce the dust content of the gas on the charging surface; (4), opening a release valve, and then closing a gas shutoff valve; and (5), closing a cold blast valve and a hot blast valve of the blast furnace to complete the stopped blast. According to the method for blast furnace low pressure emission, gas cutoff and blowing-down, the situation that the furnace top of the blast furnace keeps positive pressure after opening the release valve can be ensured, so that the atmospheric backflow is avoided, and the safety of the blast furnace blowing-down is ensured; and moreover, blowing-down is carried out immediately after emission and gas cutoff, so that the gas emission is close to 0, and the gas emission is minimized.

Description

technical field [0001] The invention relates to the technical field of blast furnace smelting, in particular to a method for blast furnace low-pressure blowing and cutting coal gas shutdown. Background technique [0002] The blast furnace is a closed high-pressure reactor filled with charge and gas. When the blast furnace needs to be overhauled, it is necessary to stop production (ie: wind off). The main purpose of the blast furnace shutdown is to disconnect the blast furnace from the gas system and communicate with the atmosphere (that is, to release and cut off the gas), and disconnect it from the air supply system (blower, hot blast stove), so that the blast furnace is in an independent system and in a Stop the production state (that is: wind off, the same below) to deliver for maintenance. [0003] The specific operation of releasing and cutting the gas in the blast furnace is: firstly open the relief valve on the top of the furnace to ensure that the gas in the blast ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B7/00
CPCC21B7/00C21B7/007
Inventor 谢友阳李向伟郑华伟
Owner 武汉钢铁有限公司