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A method and device for flue gas desulfurization by using sodium sulfide to produce solid waste

A technology of sodium sulfide and flue gas, which is applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of high treatment costs and high environmental protection pressure, and achieve the reduction of environmental protection treatment costs, lower environmental protection pressure, and simple installation Effect

Active Publication Date: 2021-06-15
HUBEI ZHENHUA CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method and device for flue gas desulfurization using solid waste produced by sodium sulfide to solve the problems that the alkali mud and waste gas produced in the sodium sulfide industry require high treatment costs and the environmental protection pressure of enterprises is huge.

Method used

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  • A method and device for flue gas desulfurization by using sodium sulfide to produce solid waste
  • A method and device for flue gas desulfurization by using sodium sulfide to produce solid waste
  • A method and device for flue gas desulfurization by using sodium sulfide to produce solid waste

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Embodiment 1

[0035] This embodiment takes the actual production situation in Huangshi Xintai Alkali Industry Co., Ltd. on November 23, 2017 as an example to explain the method of the present invention, and does not limit the present invention in any form.

[0036] see figure 1 , figure 2 , a method for utilizing sodium sulfide to produce solid waste to carry out flue gas desulfurization, comprising the following steps:

[0037] (1) Add the alkali mud with pH > 13 produced on the sodium sulfide production line into the primary slurry mixing tank 1 with a stirring device, add water to adjust the slurry, and make the water content of the slurry reach 65%; the water content of the alkali mud The content of sodium sulfide is 3%, the content of sodium carbonate is 10%, the content of sodium sulfate is 15%, and the others are water-insoluble;

[0038] (2) Send the slurry in the primary slurry tank 1 to the primary filter 3 for filtration with the filter press pump 14, collect the obtained filt...

Embodiment 2

[0080] A method of utilizing sodium sulfide to produce solid waste to carry out flue gas desulfurization, comprising the following steps:

[0081] (1) Add the alkali mud with pH > 13 produced on the sodium sulfide production line into the primary slurry mixing tank with stirring device, add water to adjust the slurry, so that the water content of the slurry reaches 50%; the water content of the alkali mud is 25%, the content of sodium sulfide is 0.5%, the content of sodium carbonate is 5%, the content of sodium sulfate is 10%, and the others are water insoluble;

[0082] (2) Send the slurry in the primary slurry tank 1 to the primary filter 3 for filtration with the filter press pump 14, collect the obtained filtrate in the lye storage tank 4 for storage, and discharge the filter cake to the secondary slurry tank 8 pulping;

[0083] (3) The lye in the lye storage tank 4 is transported to the desulfurization circulation pool 5 with the stirring device 9 by the pump 14, and the...

Embodiment 3

[0089] A method of utilizing sodium sulfide to produce solid waste to carry out flue gas desulfurization, comprising the following steps:

[0090] (1) Add the alkali mud with PH>13 produced on the sodium sulfide production line into the first-level slurry mixing tank with stirring device, add water to adjust the slurry, and make the water content of the slurry reach 80%; the water content of the alkali mud is 18%, sodium sulfide content is 5%, sodium carbonate content is 15%, sodium sulfate is 25%, and others are water-insoluble.

[0091] (2) Send the slurry in the primary slurry tank 1 to the primary filter 3 for filtration with the filter press pump 14, collect the obtained filtrate in the lye storage tank 4 for storage, and discharge the filter cake to the secondary slurry tank 8 pulping;

[0092] (3) The lye in the lye storage tank 4 is transported to the desulfurization circulation pool 5 with the stirring device 9 by the pump 14, and the lye in the desulfurization circu...

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Abstract

The invention discloses a method and a device for flue gas desulfurization by using sodium sulfide to produce solid waste. The alkali mud from the sodium sulfide production line is added to the first-level slurry mixing tank, and the slurry is added with water to make the water content reach 50-80%. First-stage filtration, the filtrate is sent to the lye storage tank for storage; then the lye is sent to the desulfurization circulation pool, and the sulfur-containing flue gas is in countercurrent contact with the desulfurization cycle, and when the pH of the slurry in the desulfurization circulation pool reaches 5-7, the slurry is sent to After being filtered by the miscellaneous salt filter, the miscellaneous salt filter cake returns to the alkali sulfide preparation process, and the filtrate flows to the miscellaneous salt liquid buffer pool for storage; the materials in the miscellaneous salt liquid buffer pool are sent to the secondary slurry tank and the primary filter cake slurry , control the pH in the secondary slurry tank to 7-9, then perform secondary filtration, the filtrate returns to the primary slurry tank for slurry mixing, and the filter cake is treated as general solid waste; the method and device of the present invention are simple and effective, and use sodium sulfide Produce alkali mud to treat sulfur-containing tail gas, use waste to control pollution, and save the production cost of the enterprise by more than 1.5 million yuan / year.

Description

technical field [0001] The invention relates to the technical field of solid waste and flue gas environmental protection treatment, in particular to a method and device for flue gas desulfurization by using sodium sulfide to produce solid waste. Background technique [0002] Industrial sodium sulfide (soda sulfide) production enterprises are mainly located in the west, and the common solid waste disposal method is open-air storage without comprehensive utilization. According to the "National Hazardous Waste List" implemented on August 1, 2016, the solid waste of alkali sulfide is included in the category of corrosive hazardous waste due to its strong alkalinity (HW35-900-399-35, other alkali residue ). Soda sulfide solid waste comes from the alkali mud produced in the sodium sulfide concentrated brine clarification process. The filter cake after washing and filtering contains 0.5-5% sodium sulfide, 5-15% sodium carbonate, and 10-25% sodium sulfate. >13, it has strong al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/50B01D53/80B01D53/96B01D53/73
CPCB01D53/502B01D53/73B01D53/80B01D53/96B01D2251/304B01D2251/606B01D2251/608B01D2258/0283
Inventor 袁金海
Owner HUBEI ZHENHUA CHEMICAL CO LTD