A system and method for reducing gas purification and tail gas treatment in a gas-based shaft furnace system

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

Active Publication Date: 2016-04-20
SHENWU TECH GRP CO LTD
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  • 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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  • A system and method for reducing gas purification and tail gas treatment in a gas-based shaft furnace system
  • A system and method for reducing gas purification and tail gas treatment in a gas-based shaft furnace system
  • A system and method for reducing gas purification and tail gas treatment in a gas-based shaft furnace system

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Embodiment 1

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

[0034] (1) Preparation of crude reducing gas

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

[0036] (2) Crude reducing gas purification

[0037] The crude reduction gas from the crude reduction gas preparation unit 1 enters the crude reduction gas desulfurization and decarbonization unit 2. First, it enters the crude reducing gas washing tower 6. The gas comes into countercurrent contact with the ...

Embodiment 2

[0050] Using the method of partial oxidation of natural gas, natural gas (hydrogen sulfide content is 20g / m 3 ), steam and oxygen are used to 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 hydrocarbon ratio of the product gas is adjusted by adjusting the amount of water vapor at 200°C. The main components of the crude reducing gas produced by this 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 , The sulfur dioxide is 100ppm, and the operating conditions are the same as in Example 1. The tail gas composition after the tail gas treatment and the catalyst regeneration unit 4 is: CO 2 Content 99.9%, SO 2 Not detected, H 2 S is not detected.

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

[0052] (1) For the reduci...

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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 preparing crude reduction gas from coal / natural gas, which is used as a gas-based shaft furnace reduction gas for desulfurization and decarbonization and tail gas treatment. Background technique [0002] At present, natural gas (including H 2 S content≤20mg / m 3 ) To partially oxidize the main components of CO and H 2 The reducing gas is used as the raw material of gas-based shaft furnace reduction gas to directly reduce iron making. 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 relatively poor quality natural gas can be used as gas-based shaft furnace reduction gas for ironmaking The synthetic raw materials can greatly reduce production costs. In addition, China's coal resources are relatively abundant. Using low-q...

Claims

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Application Information

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