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Device and method for preparing sulfur by means of carbothermic reduction of SO2

A SO2, carbothermic technology, applied in the preparation/purification of sulfur, chemical instruments and methods, sulfur compounds, etc., can solve the problem of the structure and parameters of the carbothermic reduction tower without a mature design, and achieve pressure reduction and stable operation. , the effect of broad market prospects

Active Publication Date: 2018-10-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Carbothermal reduction of SO 2 The sulfur preparation process and technology have become increasingly mature in recent years, but there is no mature design for the structure and parameters of the carbothermal reduction tower, which is also a key issue restricting the development and promotion of this process

Method used

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  • Device and method for preparing sulfur by means of carbothermic reduction of SO2

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Experimental program
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Effect test

Embodiment 1

[0044] Carbothermal reduction of SO 2 The device for preparing sulfur includes silo 1, gas-solid mixing bin 2, carbothermic reduction tower 3, high temperature gas-solid separator 4, ash hopper 5, carbon-based reducing agent buffer tank 6, carbothermic reduction tower 3 from top to bottom It is the reaction section and gas-solid mixing silo 2. The silo 1 is connected to the material inlet of the gas-solid mixing silo 2. The top of the reaction section is provided with a reducing gas outlet, which is connected to the high-temperature gas-solid separator 4, ash hopper 5, and carbon-based reduction. The buffer tank 6, the carbon-based reducing agent buffer tank 6 is connected to the return port of the gas-solid mixing tank 2. The gas-solid mixing tank 2 is sequentially provided with a bracket 9, a distribution plate 11, and a supplemental gas inlet 12 from top to bottom. The inlet pipe 15 enters the gas-solid mixing bin 2 from the bottom of the gas-solid mixing bin 2, the bracket 9...

Embodiment 2

[0057] Carbothermal reduction of SO 2 The method for preparing sulfur, the specific steps are:

[0058] 1) The powdered carbon-based reducing agent is transported from the silo to the gas-solid mixing chamber, and the reactant gas enters the gas-solid mixing chamber from the reaction gas inlet pipe, and enters the upper part of the carbothermic reduction tower after being fully mixed with the powdered carbon-based reducing agent. Gas SO 2 The concentration is 10%;

[0059] 2) At the upper part of the carbothermic reduction tower, the gas velocity in the carbothermic reduction tower is 5m / s, the gas-solid contact time in the tower is 5s, the reaction temperature is 800℃, the C / S molar ratio is 50, the reaction gas and the powdered carbon-based reducing agent The reaction obtains reducing gas, and the reducing gas is N 2 , SO 2 , COS, H 2 S, CS 2 , CO, H 2 And CO 2 Mixture

[0060] 3) The reducing gas enters the high-temperature separator, and the powdery material carried in the reduc...

Embodiment 3

[0063] Carbothermal reduction of SO 2 The method for preparing sulfur, the specific steps are:

[0064] 1) The powdered carbon-based reducing agent is transported from the silo to the gas-solid mixing chamber, and the reactant gas enters the gas-solid mixing chamber from the reaction gas inlet pipe, and enters the upper part of the carbothermic reduction tower after being fully mixed with the powdered carbon-based reducing agent. Gas SO 2 The concentration is 15%;

[0065] 2) In the upper part of the carbothermic reduction tower, the gas velocity in the carbothermic reduction tower is 5m / s, the gas-solid contact time in the tower is 5s, the reaction temperature is 900℃, the C / S molar ratio is 60, the reaction gas and the powdered carbon-based reducing agent The reaction obtains reducing gas, and the reducing gas is N 2 , SO 2 , COS, H 2 S, CS 2 , CO, H 2 And CO 2 And other mixtures.

[0066] 3) The reducing gas enters the high-temperature separator, and the powdery material carried ...

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Abstract

The invention relates to a device and method for preparing sulfur by means of carbothermic reduction of SO2 and belongs to the technical field of sulfur recovery. The device includes a material chamber,a gas-solid mixing chamber,a carbothermic reduction tower,a high-temperature gas-solid separator,an ash hopper and a carbon-based reducing agent buffering tank. The carbothermic reduction tower includes a reaction segment and the gas-solid mixing chamber from top to bottom,the material chamber is connected to a material inlet of the gas-solid mixing chamber,a reducing gas outlet is formed in thetop of the reaction segment and connected to the high-temperature gas-solid separator,the ash hopper and the carbon-based reducing agent buffering tank in sequence,and the carbon-based reducing agentbuffering tank is connected to a material returning port of the gas-solid mixing chamber; the gas-solid mixing chamber is internally provided with a bracket,a distribution plate and a supplemented gas inlet from top to bottom in sequence. A reaction gas inlet pipe enters the gas-solid mixing chamber from the bottom of the gas-solid mixing chamber,the bracket is positioned on the lower sides of the material inlet and material returning port,one end of the reaction air inlet pipe is positioned above the bracket,and SO2 flue gas with high concentration is subjected to preliminary desulfurization; sulfur is recovered,blockage caused by accumulation of materials is avoided,and the materials are fully utilized.

Description

Technical field [0001] The invention belongs to the technical field of sulfur recovery, and specifically relates to a carbothermal reduction of SO 2 Apparatus and method for preparing sulfur. Background technique [0002] With the increasingly severe environmental protection situation in my country, sulfur-containing flue gas emitted by power plants, metal smelters, and chemical plants has become the focus of current flue gas treatment. Currently the most widely used SO 2 The desulfurization technology is a limestone wet desulfurization technology, which consumes a large amount of limestone resources and water resources. The utilization rate of the by-product desulfurization gypsum is low. The desulfurization wastewater is difficult to treat, causing a large amount of waste water and waste solid discharge, causing secondary pollution. In the chemical industry, the alkali absorption method can also be used to remove sulfur components in the flue gas, but this process has the probl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/04
CPCC01B17/0482
Inventor 马春元夏霄赵希强冯太李军张世珍
Owner SHANDONG UNIV
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