A Coal Gas Treatment Method for Eliminating Black Smoke from Blast Furnace Top

A technology for coal gas and blast furnace, which is applied in the field of gas treatment to eliminate black smoke from the top of the furnace during the rewinding process of the blast furnace, and can solve the problems of black smoke from the top of the furnace, unpredictable effects, and difficulty in guiding gas.

Active Publication Date: 2022-04-19
NANJING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the utility model patent "A Blast Furnace Top Gas Purification and Discharge Device" with application number 2017201780512 can solve the problem of black smoke from the furnace top, but it needs to add a gas purification discharge device (second dust collector). The second dust collector is installed on the ground, because the pipeline is too long, it is difficult to guide the gas, and the expected effect cannot be achieved
If the second dust collector is installed on the furnace roof, it is difficult to find a suitable position due to the high position of the furnace roof and the small space, and if the dust accumulation of the second dust collector is not handled properly, it will become another source of pollution

Method used

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  • A Coal Gas Treatment Method for Eliminating Black Smoke from Blast Furnace Top

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Embodiment Construction

[0022] Below, combine figure 1 The present invention is described in further detail. Only one set of bagged box equipment is shown, 1. Blast furnace body, 2. Blast furnace top relief valve, 3. Blast furnace gas downpipe, 4. Gravity dust collector shutoff valve, 5. Gravity dust collector, 6. Nitrogen valve, 7. Nitrogen purge pipe, 8. Raw gas main pipe, 9. Bag box, 10. Imported butterfly valve for bag dust removal, 11. Dust bag, 12. Bag orifice plate, 13. Bag box release valve, 14. Bag box Diffuse pipe, 15 outlet butterfly valve for cloth bag dust removal, 16, clean gas main pipe.

[0023] In order to avoid black smoke from the top of the furnace during shutdown and recovery, this method changes the gas treatment operation procedure. Specifically, for the wind break process, the steps include:

[0024] (1) Reduce the wind of the blast furnace until the wind pressure is below 30Kpa, turn on the steam on the top of the furnace, and then perform the gas cutting operation;

[00...

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Abstract

The invention discloses a gas treatment method for eliminating black smoke from the top of a blast furnace. In the method, without adding any equipment, by changing the operation procedure of the gas treatment, the existing dry dust removal gas purification system is used to solve the problem of blast furnace shutdown. The problem of black smoke from the furnace top during the wind and rewind process. Specifically, in the process of shutting down and revitalizing the blast furnace, when the furnace is still under positive pressure, the gas is not opened on the top of the furnace, but the gas is introduced into the bag dust removal box, and the dust removal function of the bag is used to remove the dust from the gas. Afterwards, the clean gas is discharged from the release pipe of the bag filter, thereby completely eliminating the phenomenon of black smoke from the top of the furnace during shutdown and rewinding.

Description

technical field [0001] The invention relates to a method for shutting down and restoring air of a blast furnace, in particular to a gas treatment method for eliminating black smoke from the top of a blast furnace during the process of shutting down and restoring wind of a blast furnace. Background technique [0002] Shutdown and revival of blast furnace is a blast furnace operation method in which blast furnace production is temporarily stopped and then resumed. The basic operation of stopping production and resuming production of blast furnace is to stop the air supply to the furnace and resume the air supply to the furnace. During the normal operation of the blast furnace, a large amount of black smoke will be released from the top of the furnace during the shutdown and recovery process, which will cause serious pollution to the environment. The main reason for the black smoke: the pressure inside the blast furnace is about 420KPa during normal production, and the pressur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B7/00C21B7/22
CPCC21B7/002C21B7/22
Inventor 陈云宝赵伟杨道彬张行鹏刘守虎
Owner NANJING IRON & STEEL CO LTD
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