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Internal circulation cleaning treatment method and system for cyanogen-containing SRG gas

A gas and clean technology, applied in the direction of gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of sodium sulfite crystallization, increased wastewater discharge, increased alkali consumption, etc., to reduce treatment costs and avoid blockage Equipment, the effect of increasing acid production

Pending Publication Date: 2022-02-18
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the alkali consumption will increase sharply, resulting in the waste of liquid alkali and increasing the discharge of wastewater; in addition, during the process of adding alkali, sodium sulfite crystals will be formed and precipitated, causing system blockage and paralysis

Method used

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  • Internal circulation cleaning treatment method and system for cyanogen-containing SRG gas
  • Internal circulation cleaning treatment method and system for cyanogen-containing SRG gas
  • Internal circulation cleaning treatment method and system for cyanogen-containing SRG gas

Examples

Experimental program
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Effect test

Embodiment approach

[0123] According to the second embodiment of the present invention, an internal circulation cleaning treatment system of cyanide-containing SRG gas is provided.

[0124] A system for cleaning and treating cyanide-containing SRG gas using the above method, the system includes: a primary scrubber 1, a secondary scrubber 2, a tertiary scrubber 3, an acid system 4, a primary sedimentation tank 5, SO 2 Desorption tower 6. SRG Gas Delivery Pipeline L a Connected to the gas inlet of the primary scrubber 1, the gas outlet of the primary scrubber 1 is connected to the gas inlet of the secondary scrubber 2 via the first pipeline L1, and the gas outlet of the secondary scrubber 2 is connected to the gas outlet of the secondary scrubber 2 via the second pipeline L2 The gas inlet of the three-stage scrubber 3 and the gas outlet of the three-stage scrubber 3 are connected to the acid system 4 via the third pipeline L3.

[0125] Process water delivery pipeline L b Connected to the bottom ...

Embodiment 1

[0130] Such as figure 2 As shown, an internal circulation cleaning treatment system for cyanide-containing SRG gas, the system includes: a primary scrubber 1, a secondary scrubber 2, a tertiary scrubber 3, an acid system 4, a primary sedimentation tank 5, SO 2 Desorption tower 6. SRG Gas Delivery Pipeline L a Connected to the gas inlet of the primary scrubber 1, the gas outlet of the primary scrubber 1 is connected to the gas inlet of the secondary scrubber 2 via the first pipeline L1, and the gas outlet of the secondary scrubber 2 is connected to the gas outlet of the secondary scrubber 2 via the second pipeline L2 The gas inlet of the three-stage scrubber 3 and the gas outlet of the three-stage scrubber 3 are connected to the acid system 4 via the third pipeline L3.

[0131] Process water delivery pipeline L b Connected to the bottom liquid inlet of the three-stage scrubber 3, the liquid outlet of the three-stage scrubber 3 is connected to the lower liquid inlet of the s...

Embodiment 2

[0133] Repeat Example 1, except that the eighth pipeline L8 is branched from the seventh pipeline L7, and the eighth pipeline L8 is connected to the upper liquid inlet of the primary washing tower 1.

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PUM

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Abstract

An internal circulation cleaning treatment method for cyanogen-containing SRG gas comprises the following steps: 1) enabling the cyanogen-containing SRG gas to sequentially pass through a first-stage washing tower, a second-stage washing tower and a third-stage washing tower, and discharging the washed gas from the top of the third-stage washing tower; 2) enabling the gas discharged from the top of the third-stage washing tower to enter an acid making system for acid making, thereby generating concentrated sulfuric acid; 3) enabling the process water sequentially to flow through the third-stage washing tower and the second-stage washing tower and then enters the first-stage washing tower, then feeding the concentrated sulfuric acid to a first-stage washing tower and mixed with a solution in the first-stage washing tower to obtain an acidic washing solution; 4) washing and purifying the cyanogen-containing SRG gas by using the acidic washing solution, discharging the wastewater at the lower part of the primary washing tower to a primary settling tank after washing and purifying, and feeding the wastewater at the upper part of the primary settling tank into an SO2 desorption tower; and 5) removing SO2 in the wastewater by an SO2 desorption tower, and discharging acidic washing wastewater. By adding acid for washing, sulfur dioxide can be prevented from being dissolved into acid washing wastewater, and the acid production yield is increased.

Description

technical field [0001] The invention relates to a method for treating SRG gas, in particular to a method and system for internal circulation cleaning and treatment of cyanide-containing SRG gas, belonging to the field of resource and environment protection. Background technique [0002] The sintering flue gas in the iron and steel industry is desulfurized and denitrified by the activated carbon method for the flue gas purification process. The sulfur dioxide gas collected by the activated carbon is concentrated and released, and then sent to the sulfur resource workshop to produce sulfur resources. The flue gas enriched in sulfur dioxide gas is referred to as sulfur-rich gas (SRG flue gas). The gas can be purified, dried, transformed, absorbed and other processes to produce sulfur resources that meet the national standards, and the resource recovery value is high. However, the purification process in the process of producing sulfur resources will simultaneously wash the impu...

Claims

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Application Information

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IPC IPC(8): B01D53/18B01D53/14C02F1/20C02F1/52C01B17/74C02F103/18C02F101/10C02F101/12
CPCB01D53/18B01D53/1481B01D53/1406B01D53/1456B01D53/1425C02F1/20C02F1/52C01B17/74B01D2258/0283B01D2252/10C02F2103/18C02F2001/007C02F2101/101C02F2101/12Y02A50/20
Inventor 杨本涛李佳魏进超
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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