Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for controlling the hydrogen content in the coal gas during the shut-down process of recovering the gas from the blast furnace lowering line

A technology of process control and material reduction line, applied in the field of blast furnace smelting, can solve the problems of inability to feed material, burn out furnace top equipment, and high furnace top temperature, and achieve the effects of preventing gas explosion, improving safety, and improving the environment

Active Publication Date: 2022-03-18
武汉钢铁有限公司
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are many difficulties in the process of lowering the material line: ① can not be loaded, the temperature of the furnace top is high, and the furnace top and other equipment are burned out

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for controlling the hydrogen content in the coal gas during the shut-down process of recovering the gas from the blast furnace lowering line
  • A method for controlling the hydrogen content in the coal gas during the shut-down process of recovering the gas from the blast furnace lowering line
  • A method for controlling the hydrogen content in the coal gas during the shut-down process of recovering the gas from the blast furnace lowering line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0040] A certain 1800m 3 After 8 years of blast furnace production, the empty material line was shut down for maintenance. In order to ensure the gas safety during the shutdown process and reduce the H2 content in the gas, the shutdown method is as follows.

[0041] 1. Do a good job of preparation before the empty material line

[0042] 1) Appropriately reduce the amount of coke in the center by 50% 8 hours in advance.

[0043] 2) Install a set of furnace top atomization water pumping device to ensure sufficient water pumping capacity of 120t / h.

[0044]3) The static pressure pipe hole of the furnace body is ready to pass through N 2 , up to 10000m 3 / h.

[0045] 4) Prepare 2 probes that can reach the tuyere, the depth can reach 25m, and mark it on the chain.

[0046] 5) Before stopping the furnace, keep the furnace running smoothly and the furnace temperature is sufficient, and add 600kg / batch of manganese ore to wash the furnace one day in advance.

[0047] 6) Furnace...

Embodiment example 2

[0063] A certain 3200m 3 After 13 years of blast furnace production, the empty material line was shut down for maintenance. In order to ensure the gas safety during the shutdown process, reduce the H in the gas 2 content, the shutdown method is as follows.

[0064] 1. Do a good job of preparation before the empty material line

[0065] 1) Appropriately reduce the amount of coke in the center by 30% 8 hours in advance.

[0066] 2) Install a set of furnace top atomization water pumping device to ensure sufficient water pumping capacity of 200t / h.

[0067] 3) The static pressure pipe hole of the furnace body is ready to pass through N 2 , up to 15000m 3 / h.

[0068] 4) Prepare 2 probes that can reach the tuyere, the depth can reach 28m, and mark it on the chain.

[0069] 5) Before stopping the furnace, keep the furnace running smoothly and the furnace temperature is sufficient, and add manganese ore to wash the furnace 1000kg / batch one day in advance.

[0070] 6) The load...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for controlling the hydrogen content in the coal gas during the process of recovering the gas from the lowering line of the blast furnace. The coke on the cover surface is canceled when the furnace is stopped, and the charging ends with ore; the ore is distributed in the 80%-85% of the furnace 15-20% of the coke area in the center; the cover coke is added before the last batch of ore, and the total coke ratio of the blast furnace shutdown charge remains unchanged, while ensuring that the final ore layer thickness is 400-450mm in the furnace waiting, down to the furnace waist More than 200mm. The present invention effectively makes the water gas reaction (C+H 2 O→CO+H 2 ‑131kJmol ‑1 ) is greatly reduced. While the H in the gas during the shutdown process 2 Mainly comes from the water gas reaction, so the H in the gas 2 The content is greatly reduced, which can effectively prevent gas explosions, avoid knocking, and improve safety. At the same time, recovering gas to the greatest extent not only saves energy, but also reduces emissions and improves the environment, which has significant economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of blast furnace smelting, in particular to a process for recovering gas from a blast furnace drop line and shutting down the furnace. Background technique [0002] The blast furnace is a shaft furnace type counter-flow reactor. The raw fuel (sintering + pellets + lump ore + coke) added from the top of the furnace is affected by the high-temperature reducing gas flowing upstream (the reducing gas is blown in by the blower, and enters the blast furnace through the tuyeres after the hot blast stove is heated up, and The coke in the blast furnace burns to form gas). It is continuously heated, decomposed, reduced, softened, melted, dripped, carburized and finally separated by forming slag iron melt. The volume of the blast furnace ranges from hundreds to thousands of cubic meters, and the production process of the blast furnace is carried out continuously. The iron hole is continuously tapped under the continu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00C21B5/06
CPCC21B5/00C21B5/06Y02P10/25
Inventor 尹腾陈胜香李昕郑华伟张建鹏林巍
Owner 武汉钢铁有限公司