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Comprehensive treatment process for high-temperature removed dust

A technology for high-temperature dust removal and comprehensive treatment, which is applied in the field of flue gas treatment in the metallurgical industry, can solve the problems of high-temperature dust removal ash having no energy-saving effect, and achieve the effects of reducing energy consumption, increasing comprehensive benefits, and reducing costs.

Inactive Publication Date: 2012-01-25
CISDI SHANGHAI ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology does not have a simple and energy-saving treatment method for the above-mentioned high-temperature dust removal

Method used

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  • Comprehensive treatment process for high-temperature removed dust
  • Comprehensive treatment process for high-temperature removed dust
  • Comprehensive treatment process for high-temperature removed dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this embodiment, the high-temperature dust removal comprehensive treatment process of the present invention is used to process the high-temperature flue gas generated by the final reduction furnace in the two-step smelting reduction process, including the following steps:

[0025] a) Dedust the high-temperature flue gas produced by the final reduction furnace in the two-step smelting reduction process, and use the dry high-temperature dust collector 1 to obtain high-temperature dedusting ash, which is stored in the dust storage tank 2. The temperature of the high-temperature dedusting ash can reach 700-850°C, the clean high-temperature gas after dedusting is mainly used in the pre-reduction shaft furnace, and the dry-process high-temperature dust collector adopts a hot cyclone dust collector. Of course, the purpose of the present invention can also be achieved by using other dry-process high-temperature dust collectors;

[0026] b) Without cooling treatment, use the h...

Embodiment 2

[0030] In this embodiment, the high-temperature dust-removing ash comprehensive treatment process of the present invention is used to process the high-temperature flue gas produced by the coal gasifier in the coal gasification process, including the following steps:

[0031] a) Dedust the high-temperature flue gas produced by the gas generator, and use the dry-process high-temperature dust collector 1 to obtain high-temperature dedusting ash, which is stored in the dust storage tank 2. The temperature of the high-temperature dedusting ash can reach 700-850 ° C. After dedusting The clean high-temperature gas is used in the pre-reduction shaft furnace or other chemical units, and the dry high-temperature dust collector adopts a hot cyclone dust collector;

[0032] b) Without cooling treatment, use the hot briquetting machine 3 to press the high-temperature dedusting ash obtained in step a) into a hot dedusting ash briquette;

[0033] c) Since the hot dedusting ash briquette main...

Embodiment 3

[0036] In this embodiment, the high temperature flue gas generated by the converter is processed by using the high temperature comprehensive dust removal process of the present invention, including the following steps:

[0037] a) Dedusting the high-temperature flue gas discharged from the converter steelmaking vaporization hood, the temperature of the high-temperature flue gas reaches 800-1000°C, and the dust concentration reaches 200g / Nm 3 , the high-temperature dedusting ash obtained after dedusting by the dry-process high-temperature deduster 1 is stored in the dust storage tank 2, the temperature of the high-temperature dedusting ash can reach 750-950°C, and the clean high-temperature flue gas of dedusting enters the waste heat recovery device;

[0038] b) Without cooling treatment, use the hot briquetting machine 3 to press the high-temperature dedusting ash obtained in step a) into a hot dedusting ash briquette;

[0039] c) Since the hot dedusting ash briquette in step ...

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Abstract

The invention discloses a comprehensive treatment process for high-temperature removed dust. The process is used for thermally pressing the high-temperature removed dust to form hot removed dust press blocks by effectively using massive physical heat of dry high-temperature removed dust and easy forming property of a high-temperature material. The hot removed dust press block product provides a hot raw material for the subsequent process, and is added into a final reduction furnace or a pre-reduction furnace in a two-step smelting reduction process or added into a blast furnace after being cooled in use, so that the energy consumption of the subsequent process is effectively reduced. Meanwhile, the process links of cooling the hot removed dust, mixing, adding adhesive, pelletizing and the like in the conventional dust treatment flow are canceled in the hot removed dust press block process, so the process flow has predominant effects of saving energy, protecting environment, reducing cost, increasing comprehensive benefit and the like.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment in the metallurgical industry, in particular to a recycling technology of high-temperature dedusting ash. Background technique [0002] In the two-step smelting reduction ironmaking process, the high-temperature flue gas is used in the one-step reduction shaft furnace after being dedusted by the hot cyclone. The hot cyclone dedusting produces high-temperature dust at 750 ° C to 850 ° C. The high-temperature flue gas generated by the final reduction furnace contains About 70% of the dust containing Fe and C. In the prior art, the above-mentioned high-temperature dust is recycled by mixing and pelletizing after cooling, which has the disadvantage of a huge waste of physical heat of the high-temperature dust. At the same time, after the high-temperature dust is cooled, it is necessary to increase the process links such as binder and pelletization. The process is complicated and the proces...

Claims

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Application Information

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IPC IPC(8): C22B1/16
Inventor 金明芳吕遐平宋华尹慧超张涛倪晓明
Owner CISDI SHANGHAI ENG CO LTD
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