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Efficient method and device for preparing sulfuric acid from desulfurization waste liquid of coking plant

A technology for desulfurization waste liquid and sulfuric acid production, which is applied in chemical instruments and methods, steam generation methods using heat carriers, separation methods, etc., can solve the problem that the by-product dilute sulfuric acid solution cannot be digested internally, the combustion process is difficult to adjust, and the heat energy Problems such as low utilization efficiency

Active Publication Date: 2020-10-23
山东绿知源环保工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-efficiency method and device for producing sulfuric acid from desulfurization waste liquid in coking plants, so as to solve the problems in the prior art that the utilization efficiency of heat energy is low, the adjustment of the combustion process is difficult, and the by-product dilute sulfuric acid solution cannot be digested internally. technical problem

Method used

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  • Efficient method and device for preparing sulfuric acid from desulfurization waste liquid of coking plant
  • Efficient method and device for preparing sulfuric acid from desulfurization waste liquid of coking plant
  • Efficient method and device for preparing sulfuric acid from desulfurization waste liquid of coking plant

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Effect test

Embodiment 1

[0058] The working steps of a device for producing sulfuric acid from desulfurization waste liquid in a coking plant:

[0059] S1: Pressure filtration, the desulfurization waste liquid and sulfur foam produced by the ammonia gas desulfurization of the coking plant are sent through the pipeline to the high-efficiency filter press 1 for separation to obtain sulfur paste and separated clear liquid;

[0060] S2: Concentration, introducing the separated liquid described in S1 into the multi-effect evaporator 2, through the multi-effect evaporator 2, the separated liquid is concentrated into sulfur slurry;

[0061] S3: incineration, the sulfur paste obtained in S1 and the sulfur slurry obtained in S2 are sent to the incinerator 3 through the screw feeder 10 and the pipeline respectively, and are burnt in zones in the incinerator 3 to generate sulfur dioxide flue gas;

[0062] S4: Dust removal and cooling, the sulfur dioxide flue gas from the incinerator 3 is first dedusted by the hi...

Embodiment 2

[0071] The working steps of a device for producing sulfuric acid from desulfurization waste liquid in a coking plant:

[0072] S1: Pressure filtration, the desulfurization waste liquid and sulfur foam produced by the ammonia gas desulfurization of the coking plant are sent through the pipeline to the high-efficiency filter press 1 for separation to obtain sulfur paste and separated clear liquid;

[0073] S2: Concentration, introducing the separated liquid described in S1 into the multi-effect evaporator 2, through the multi-effect evaporator 2, the separated liquid is concentrated into sulfur slurry;

[0074] S3: incineration, the sulfur paste obtained in S1 and the sulfur slurry obtained in S2 are sent to the incinerator 3 through the screw feeder 10 and the pipeline respectively, and are burnt in zones in the incinerator 3 to generate sulfur dioxide flue gas;

[0075] S4: Dust removal and cooling, the sulfur dioxide flue gas from the incinerator 3 is first dedusted by the hi...

Embodiment 3

[0084] The working steps of a device for producing sulfuric acid from desulfurization waste liquid in a coking plant:

[0085] S1: Pressure filtration, the desulfurization waste liquid and sulfur foam produced by the ammonia gas desulfurization of the coking plant are sent through the pipeline to the high-efficiency filter press 1 for separation to obtain sulfur paste and separated clear liquid;

[0086] S2: Concentration, introducing the separated liquid described in S1 into the multi-effect evaporator 2, through the multi-effect evaporator 2, the separated liquid is concentrated into sulfur slurry;

[0087] S3: incineration, the sulfur paste obtained in S1 and the sulfur slurry obtained in S2 are sent to the incinerator 3 through the screw feeder 10 and the pipeline respectively, and are burnt in zones in the incinerator 3 to generate sulfur dioxide flue gas;

[0088] S4: Dust removal and cooling, the sulfur dioxide flue gas from the incinerator 3 is first dedusted by the hi...

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Abstract

The invention discloses a method and a device for preparing sulfuric acid from desulfurization waste liquid of a coking plant, and relates to the field of industrial wastewater treatment. The method comprises the following steps of: S1, centrifuging: centrifuging desulfurization waste liquid and sulfur foam to obtain sulfur paste and separated clear liquid; S2, concentration: concentrating the separated clear liquid to obtain sulfur slurry; S3, incineration: combusting the sulfur paste and the sulfur slurry in different areas; S4, dust removal and cooling: dedusting and then cooling sulfur dioxide flue gas generated by combustion; S5, drying and dehumidifying: removing impurities from the flue gas, dehumidifying the flue gas, dehydrating the flue gas, producing dilute sulfuric acid as a byproduct; S6, tail gas recovery: preparing industrial sulfuric acid from the treated sulfur dioxide gas, and returning the industrial sulfuric acid to a deamination system of a coking plant to remove ammonia in the coke oven gas to obtain ammonium sulfate; and S7, by-product recycling: neutralizing the dilute sulfuric acid concentrated solution obtained in S3 with dilute ammonia water, carrying outfiltering and concentrating to obtain an ammonium sulfate solution, and recovering the separated clear liquid. According to the invention, the technology for preparing sulfuric acid from desulfurization waste liquid and sulfur foam is upgraded, and the problems of high efficiency, energy conservation and environmental protection are thoroughly solved.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a high-efficiency method and device for producing sulfuric acid from desulfurization waste liquid of a coking plant. Background technique [0002] In coking plant desulfurization waste liquid and sulfuric acid foam technology, the current representative ones are wet process and dry process. The main feature of the wet process is that the desulfurization waste liquid and sulfur foam are mixed into a slurry with a water content of about 55%-65% after pretreatment and sprayed into the horizontal incinerator for combustion. The main feature of the dry process is that the desulfurization waste liquid and sulfur foam are After pretreatment, it is dried into a solid mixture (with a water content of 3%-5%) and sent to a vertical incinerator for combustion. Both processes need to provide an external heat source to evaporate the water in the solution, and the heat energy uti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/765C01B17/80C01B17/54C01B17/56C01B17/02C01C1/242C02F9/10B01D50/00F22B1/16C02F103/18
CPCC01B17/765C01B17/80C01B17/54C01B17/56C01B17/0205C01B17/0243C01C1/242C02F1/001C02F1/04B01D50/00F22B1/16C02F2103/18Y02P20/10Y02P20/129
Inventor 孟昭颂宋伯苍尹建斌王玉衡
Owner 山东绿知源环保工程有限公司
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