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Process method and device for removing hydrogen chloride by powder spraying in blast furnace gas pipeline

A technology of blast furnace gas and process method, which is applied in the field of blast furnace gas purification, can solve problems such as increasing device operation and maintenance costs, reducing TRT power generation efficiency, and low utilization rate of effective components, and achieves suitable adjustment characteristics, small footprint, and high heat output. The effect of low loss

Active Publication Date: 2021-06-22
BEIJING PEKING UNIV PIONEER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Most of the existing blast furnace gas fixed-bed dechlorination technologies have the following problems: 1. The on-site blast furnace gas purification equipment is compact, and there is no extra space on site to install additional dry-type acid removal adsorption towers; 2. Several types of acid removal adsorption towers are put into use. 3. There will be a lot of dust at the outlet of the dechlorination tower, and a filter device must be added; 4. The dechlorination agent is consumable, and it must be replaced after it penetrates. The dechlorination tower At least two units must be installed to ensure continuous production. Disassembling and assembling the dechlorination agent consumes manpower and material resources, which greatly increases the operation and maintenance cost of the device; secondary pollution to the environment

Method used

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  • Process method and device for removing hydrogen chloride by powder spraying in blast furnace gas pipeline
  • Process method and device for removing hydrogen chloride by powder spraying in blast furnace gas pipeline

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The condition of the blast furnace gas in the outlet pipeline of the coarse dust collector 2 is: the flow rate is 200,000 / Nm 3 / h, the pressure is about 0.2MPa, the temperature is about 150℃, the line speed is about 20m / s, and the dust content is 10g / m 3 , water content 52g / Nm 3 About, containing HCl 98mg / m 3 .

[0040] The larger particle dechlorination agent loaded in the hopper 8 of the dechlorination agent bag filter is ground into a powder below 300 mesh (50um) by the mill 9, and then the fan 10 draws and transports the dechlorination agent and sprays it. into the pipeline. The sprayed powder dechlorination agent is 100kg / h, and the powder content in the gas is 0.5g / m 3 . The dechlorination agent is activated in the pipeline, and the specific surface area increases rapidly. The powder particles are suspended in the air flow, and fully and evenly contact with the blast furnace gas for 1 to 2 seconds. A chemical reaction occurs, and the HCl in the blast furnace ...

Embodiment 2

[0043] The condition of the blast furnace gas in the outlet pipeline of the coarse dust collector 2 is: the gas flow rate is 200,000 / Nm 3 / h, the pressure is about 0.2MPa, the temperature is about 150℃, the line speed is about 20m / s, and the dust content is 10g / m 3 , water content 52g / Nm 3 About, containing HCl 103mg / m 3 .

[0044] The larger particle dechlorination agent loaded in the hopper 8 of the dechlorination agent bag filter is ground into a powder below 300 mesh (50um) by the mill 9, and then the fan 10 draws and transports the dechlorination agent and sprays it. into the pipeline. The sprayed powder dechlorination agent is 60kg / h, and the powder content in the gas is 0.3g / m 3 . The dechlorination agent is activated in the pipeline, and the specific surface area increases rapidly. The powder particles are suspended in the air flow, and fully and evenly contact with the blast furnace gas for 1 to 2 seconds. A chemical reaction occurs, and the HCl in the blast furn...

Embodiment 3

[0047] The condition of the blast furnace gas in the outlet pipeline of the coarse dust collector 2 is: the gas flow rate is 200,000 / Nm 3 / h, the pressure is about 0.2MPa, the temperature is about 150℃, the line speed is about 20m / s, and the dust content is 10g / m 3 , water content 52g / Nm 3 About, containing HCl 110mg / m 3 .

[0048] The larger particle dechlorination agent loaded in the hopper 8 of the dechlorination agent bag filter is ground into a powder below 300 mesh (50um) by the mill 9, and then the fan 10 draws and transports the dechlorination agent and sprays it. into the pipeline. The sprayed powder dechlorination agent is 50kg / h, and the powder content in the gas is 0.25g / m 3 . The dechlorination agent is activated in the pipeline, and the specific surface area increases rapidly. The powder particles are suspended in the air flow, and fully and evenly contact with the blast furnace gas for 1 to 2 seconds. A chemical reaction occurs, and the HCl in the blast fur...

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Abstract

The invention discloses a process method and device for removing hydrogen chloride by powder spraying of blast furnace gas pipelines. The device for removing hydrogen chloride by powder spraying of blast furnace gas pipelines is used to remove hydrogen chloride by dry spraying blast furnace gas dechlorination process; Install the dechlorination agent bag filter hopper, pulverizer and fan on the pipeline after the dry coarse dust collector and before the bag filter with the device; set the blast furnace gas condition in the outlet pipeline of the dry coarse dust collector, The dechlorination agent is ground to obtain a larger specific surface area, and is directly sprayed into the blast furnace gas pipeline by powder spraying for dechlorination reaction. Adopting the technical scheme of the invention, the one-time investment is small, the floor area is small, the system operation is simple, and the maintenance is convenient; the process of the invention can effectively improve the uniformity and adequacy of the contact between the dechlorination agent and the blast furnace gas, and improve the effect of dry dechlorination , the heat loss of blast furnace gas is low, and it does not affect the subsequent use of TRT.

Description

technical field [0001] The invention relates to the technical field of blast furnace gas purification, in particular to a process and a device for removing hydrogen chloride by powder spraying in a blast furnace gas pipeline. Background technique [0002] In recent years, domestic iron and steel enterprises have generally adopted dry-type bag filter technology for blast furnace gas, which has brought great economic and social benefits. However, with the continuous accumulation of production experience, it has been found that when the blast furnace gas adopts full dry bag dust removal, because the gas contains ammonia, chlorine, sulfur and other impurities, the blast furnace gas residual pressure turbine power generation unit (Blast Furnace Top Gas Recovery Turbine Unit) , hereinafter referred to as TRT), pipeline system and auxiliary equipment, there are a lot of salt accumulation and corrosion problems, which have brought huge economic losses to the enterprise, and also gre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/06C21B7/22
CPCC21B5/06C21B7/22Y02P10/25
Inventor 梁曙光郭迎秋
Owner BEIJING PEKING UNIV PIONEER TECH
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