System and method for reducing gas purification and tail gas treatment of gas base shaft furnace system

A technology for tail gas treatment and gas-based shaft furnace, which is applied in chemical instruments and methods, separation methods, granular/powder fuel gasification, etc., to achieve the effects of ensuring continuity, reducing consumption and avoiding costs

Active Publication Date: 2014-09-10
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve some problems existing in the preparation and purification of reducing gas and tail gas treatment in the existing gas-based shaft furnace system, to develop natural gas or low-quality coal with high latent sulfur content as the reducing gas for producing gas-based shaft furnaces, and to provide A system and method for reducing gas purification and tail gas treatment in a gas-based shaft furnace system

Method used

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  • System and method for reducing gas purification and tail gas treatment of gas base shaft furnace system
  • System and method for reducing gas purification and tail gas treatment of gas base shaft furnace system
  • System and method for reducing gas purification and tail gas treatment of gas base shaft furnace system

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Embodiment 1

[0033] In this embodiment, the pulverized coal pyrolysis method is used to use oxygen, pulverized coal and water vapor as raw materials. The specific process steps as shown in the figure include:

[0034] (1) Preparation of crude reducing gas

[0035] Raw materials are prepared in crude reducing gas preparation unit 1, the temperature is 1000°C, the reaction pressure is 0.8MPa, and the carbon-hydrogen ratio of the product gas is adjusted by adjusting the amount of water vapor at 200°C. The main components of the raw reducing gas produced by the unit include CO 2 , CO, H 2 O, H 2 and H 2 S, where CO 2 The content is 3%, the hydrogen sulfide content is 5g / m 3 .

[0036] (2) Purification of crude reducing gas

[0037] The crude reducing gas from the crude reducing gas preparation unit 1 enters the crude reducing gas desulfurization and decarburization unit 2 . Firstly, it enters the rough reducing gas water washing tower 6, and the gas is in countercurrent contact with th...

Embodiment 2

[0050] Adopt the method of partial oxidation of natural gas, natural gas (hydrogen sulfide content is 20g / m 3 ), steam and oxygen prepare crude reducing gas in crude reducing gas preparation unit 1, wherein the hydrogen sulfide content in natural gas is 20g / m 3 , the reaction temperature is 900°C, the reaction pressure is 0.8MPa, and the carbon-hydrogen ratio of the product gas is adjusted by adjusting the amount of water vapor at 200°C. The main components of the raw reducing gas produced by the unit include CO 2 , CO, H 2 O, H 2 、H 2 S and SO 2 , where CO 2 5%, hydrogen sulfide content is 8g / m 3 , sulfur dioxide is 100ppm, and its operation condition is identical with embodiment 1, and the tail gas composition after tail gas treatment and catalyst regeneration unit 4 processing is: CO 2 Content 99.9%, SO 2 Not detected, H 2 S was not detected.

[0051] Compared with the prior art, the present invention has the following advantages and progress:

[0052] (1) The sy...

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Abstract

The invention provides a system for reducing gas purification and tail gas treatment of a gas base shaft furnace system. The system comprises a crude reducing gas preparation unit (1), a crude reducing gas decarburization and desulfurization unit (2), a decarburization and desulfurization acid gas treatment unit (3), a tail gas treatment and catalyst regeneration unit (4) and a gas base shaft furnace reducing iron-making unit (5), wherein the crude reducing gas preparation unit (1) is sequentially connected with the crude reducing gas decarburization and desulfurization unit (2), the decarburization and desulfurization acid gas treatment unit (3) and the tail gas treatment and catalyst regeneration unit (4); the crude reducing gas decarburization and desulfurization unit (2) is respectively connected with the tail gas treatment and catalyst regeneration unit (4) and the gas base shaft furnace reducing iron-making unit (5); and the gas base shaft furnace reducing iron-making unit (5) is connected with the tail gas treatment and catalyst regeneration unit (4). By adopting the system, the demands on the crude reducing gas materials are reduced, and exhaust gas emission and environmental pollution are reduced.

Description

technical field [0001] The invention relates to the technical field of chemistry and chemical engineering, in particular to a system and method for desulfurization, decarburization and tail gas treatment of a coal / natural gas-based crude reduction gas used as the reduction gas of a gas-based shaft furnace. Background technique [0002] At present, natural gas is a multi-purpose product in foreign countries (of which H 2 S content≤20mg / m 3 ) to partially oxidize it to produce CO and H 2 The reducing gas is used as the raw material of the gas-based shaft furnace reducing gas for direct reduction ironmaking. Compared with foreign countries, China's natural gas resources are relatively scarce, and most of China's natural gas resources contain high hydrogen sulfide. If this part of relatively low-quality natural gas can be used as a gas-based shaft furnace to reduce ironmaking Synthetic raw materials can greatly reduce production costs. In addition, China is relatively rich i...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C01B3/38C10J3/46C10J3/48B01D53/86
CPCY02P20/584
Inventor吴道洪闫琛洋史雪君窦从从
OwnerSHENWU TECH GRP CO LTD