A sulfur dioxide recycling system and method

A sulfur dioxide and resource recovery technology, applied in chemical instruments and methods, thiosulfate/dithionite/polythionate, inorganic chemistry, etc., can solve high cost, low production cost of by-products, and product capacity To reduce the overall investment of the system, ensure ultra-low emissions, and improve operational flexibility

Active Publication Date: 2020-09-08
NANJING TECH UNIV +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, desulfurization gypsum, magnesium sulfate, sodium sulfate, etc. are mainly waste, and high cost is required for secondary treatment; although ammonium sulfate, sulfuric acid, etc. have certain economic value, the excess capacity of related products is large, and by-products The value is far lower than the production cost, and the above two desulfurization process routes will continue to lose money at present and for a long time in the future
At the same time, waste gas recycling technology has been proposed for many years, and it is generally recognized that the best technical route is to directly reduce sulfur dioxide to elemental sulfur. 2 Exhaust gas technology still fails to circumvent the above technical scope, and the reality of desulfurization of secondary pollutants or high cost of desulfurization is still ongoing

Method used

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  • A sulfur dioxide recycling system and method

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Experimental program
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Effect test

Embodiment 1

[0042] Embodiment 1 synthetic sodium thiosulfate and sulfur powder

[0043] ①. Preparation of elemental sulfur: In the carbonaceous reduction furnace, white coal, carbon fines, coke, high-sulfur coal or petroleum coke are used as conventional carbonaceous reductants and SO-containing 2 The original flue gas undergoes redox reaction to generate process gas containing gaseous sulfur, and the volume content of oxygen in the process gas is controlled below 1.5%. In the carbon reduction furnace, it can be divided into ash cooling section, SO 2 The reduction section, the reductant preheating section, and the lower part of the ash cooling section are controlled at 250~380°C, SO 2 The temperature of the reducing section is controlled at 860~1100°C, and the temperature of the upper part of the reductant preheating section is controlled at 380~650°C; the carbonaceous reducing agent and sulfur-containing flue gas SO 2 The mass metering ratio is M1:M2=1:(3~8), where M 1 is the mass flo...

Embodiment 2

[0058] Embodiment 2 sodium thiosulfate and liquid sulfur

[0059] ①. Preparation of elemental sulfur: In the carbonaceous reduction furnace, white coal, carbon fines, coke, high-sulfur coal or petroleum coke are used as conventional carbonaceous reductants and SO-containing 2 The original flue gas undergoes redox reaction to generate process gas containing gaseous sulfur, and the volume content of oxygen in the process gas is controlled below 1.5%. In the carbon reduction furnace, it can be divided into ash cooling section, SO 2 The reduction section, the reductant preheating section, and the lower part of the ash cooling section are controlled at 250~380°C, SO 2 The temperature of the reducing section is controlled at 860~1100°C, and the temperature of the upper part of the reductant preheating section is controlled at 380~650°C; the carbonaceous reducing agent and sulfur-containing flue gas SO 2 The mass metering ratio is M1:M2=1:(2~8), where M1 is the mass flow rate of fi...

Embodiment 3

[0076] Embodiment 3 Preparation of liquid sulfur and sodium sulfite

[0077] ①. Preparation of elemental sulfur: In the carbonaceous reduction furnace, conventional carbonaceous reducing agents such as white coal, carbon fines, coke, high-sulfur coal, petroleum coke and SO containing 2 The original flue gas undergoes redox reaction to generate process gas containing gaseous sulfur, and the volume content of oxygen in the process gas is controlled below 1.5%. In the carbon reduction furnace, it can be divided into ash cooling section, SO 2 The reduction section, the reductant preheating section, and the lower part of the ash cooling section are controlled at 250~380°C, SO 2 The temperature of the reducing section is controlled at 860~1100°C, and the temperature of the upper part of the reductant preheating section is controlled at 380~650°C; the carbonaceous reducing agent and sulfur-containing flue gas SO 2 The mass metering ratio is M1:M2=1:(2~8), where M1 is the mass flow ...

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Abstract

A sulfur dioxide resource recycling system and method belong to the field of chemical industry. The method comprises the carbonaceous reduction furnace, high temperature dust remover, cooling separator A, liquid sulfur tank, cooling separator B, tail gas absorption tower, stripping tower, hypo wave reactor, centrifuge, mother liquor tank, thick and other main functional equipment, and through ① preparation of elemental sulfur, ② dust removal of process gas containing gaseous sulfur, ③ separation of elemental sulfur, ④ residual SO 2 Gas reabsorption, ⑤ purification of powdered sulfur, ⑥ preparation of hypoclinker slurry, ⑦ liquid-solid separation, ⑧ configuration of absorption slurry, etc., the SO 2 The gas is reduced to liquid sulfur and powder sulfur, and the co-production of sodium thiosulfate avoids SO 2 The pollution problem of sulfur by-products, no waste water, solves the problem of SO 2 The low conversion rate of gas to sulfur can greatly reduce the overall investment of the system, improve the flexibility of system operation, and allow SO 2 The sulfur production technology has the possibility of practical application.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a sulfur dioxide resource recovery system and method. Background technique [0002] The sulfur dioxide emitted in industrial waste gas is as high as hundreds of millions of tons every year. Conventional desulfurization or sulfur fixation technologies will form desulfurization by-products, such as gypsum, magnesium sulfate, ammonium sulfate, sulfuric acid, sodium sulfate, etc. At present, desulfurization gypsum, magnesium sulfate, sodium sulfate, etc. are mainly waste, and high cost is required for secondary treatment; although ammonium sulfate, sulfuric acid, etc. have certain economic value, the excess capacity of related products is large, and by-products The value is far lower than the production cost, and the above two desulfurization process routes will continue to lose money at present and for a long time in the future. At the same time, waste gas recycling technology has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/04C01B17/64C01D5/14
CPCC01B17/0482C01D5/14C01B17/64C01B17/021C01B17/0232B01D2257/302B01D53/508B01D53/502B01D53/73B01D53/75B01D53/82B01D53/78B01D2251/304B01D2251/20B01D2258/0283C01P2006/80C01P2006/60C01P2006/82B01D5/0072B01D5/0093B01D46/0036B01D53/80B01D2251/608
Inventor 徐海涛徐延忠李明波陈任远刘大华吴振山宋静徐梦
Owner NANJING TECH UNIV
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