Coal gasification sewage reuse treatment method and device

A technology of coal gasification sewage and treatment methods, which is applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, natural water treatment, etc. It can solve the problems of large sewage water volume, large dosage of chemicals, high investment and operation costs, etc. problems, to achieve the effect of reducing the amount of concentrated water and organic matter content, the proportion of organic matter and ammonia nitrogen content is appropriate, and the water resource utilization rate is high

Active Publication Date: 2021-04-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]1. Sewage has the characteristics of large water volume, high calcium hardness, high ammonia nitrogen, high COD, etc., resulting in long treatment and reuse process, high investment and operation costs, and large area occupied
[0008]2. Ultrafiltration + reverse osmosis desalination is used after sewage treatment, which has the problems of low water production rate and difficult treatment of concentrated water
[0009]3. It is difficult to biochemically treat fluoride ions, and there are problems of high equipment investment or large dosage of chemicals when treating fluoride ions
[0010]4. When the electro-adsorption process is used to treat sewage, there are problems such as calcium fluoride scaling, polyacrylamide pollution of electro-adsorption components, and ammonia nitrogen concentration affecting the operation of biochemical reactions, etc.

Method used

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  • Coal gasification sewage reuse treatment method and device

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Effect test

Embodiment 1

[0080] A coal gasification device consumes 1,700 tons of raw coal, about 1,100 tons of water for coal-water slurry, and about 2,400 tons of sewage discharged outside. Regardless of evaporation loss, it can be seen that other auxiliary, washing, cooling and other facilities use more than 1,300 tons of water. Adopting the process of the present invention, the raw water is off-white, with a conductivity of 3700 μS / cm, calcium hardness of 750 mg / L, alkalinity of 680 mg / L, fluoride ions of 15 mg / L, ammonia nitrogen of 270 mg / L, and COD of 500 mg / L. When the flocculant dosage is 100mg / L, the turbidity of the flocculated water is 1.4NTU, and the suspended ash is removed. The pH value of alkali addition reaction is 10.2~10.5, the calcium hardness of alkali precipitation effluent is 150~180mg / L, and the ammonia nitrogen of gasification membrane effluent is 20~30mg / L.

[0081]The effluent from the ammonia removal area enters the filter unit after the pH value is adjusted by the acid sol...

Embodiment 2

[0133] A coal gasification device consumes 1,700 tons of raw coal, about 1,100 tons of water for coal-water slurry, and about 2,400 tons of sewage discharged outside. Regardless of evaporation loss, it can be seen that other auxiliary, washing, cooling and other facilities use more than 1,300 tons of water. Adopting the technology of the present invention, the raw water is off-white, with conductivity of 3700 μS / cm, calcium hardness of 750 mg / L, alkalinity of 680 mg / L, fluoride ion of 18 mg / L, ammonia nitrogen of 300 mg / L, and COD of 700 mg / L. When the flocculant dosage is 50mg / L, the turbidity of the flocculated water is 2.0NTU, and the suspended ash is removed. The pH value of alkali addition reaction is 9.5~9.8, the calcium hardness of alkali precipitation effluent is 200~250mg / L, and the ammonia nitrogen of gasification membrane effluent is 30~40mg / L.

[0134] The effluent from the ammonia removal area enters the filter unit after the pH value is adjusted by the acid solut...

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Abstract

The invention belongs to the technical field of coal gasification sewage treatment, and particularly relates to a coal gasification sewage reuse treatment method and a device. The method comprises the following steps: adding a flocculating agent into the coal gasification sewage to remove suspended ash, adding alkali liquor to remove calcium hardness, removing ammonia to reduce ammonia nitrogen in the water, filtering in a filtering unit, carrying out electro-adsorption desalination, recycling the produced water for supplementing water to coal water slurry, carrying out defluorination treatment on the concentrated water, and finally carrying out biochemical treatment until the water is discharged after reaching the standard. According to the coal gasification sewage reuse treatment method and device, high-water-yield reuse of the coal gasification sewage can be guaranteed, meanwhile, the amount of concentrated water and the content of organic matter are reduced, and the standard treatment cost of the concentrated water is low.

Description

technical field [0001] The invention belongs to the technical field of coal gasification sewage treatment, and in particular relates to a treatment method and device for coal gasification sewage reuse. Background technique [0002] my country is a country with a lot of coal and little oil and little gas. Coal, as a basic energy source and an important raw material, will be the main energy source in our country for a long time. Through different processes, coal can be converted into various chemical raw materials. At present, many coal chemical technologies have been successfully applied, such as coal-to-methanol, coal-to-olefins, coal-to-ethylene glycol, coal-to-natural gas, coal-to-hydrogen, etc. These technologies can solve the problem of poor oil and less gas energy. The above coal chemical technologies all need to gasify coal. The commonly used coal gasification technology is coal water slurry pressurized gasification technology, that is, coal, water, additives, alkali,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/34
Inventor 梁明张广张方银潘咸峰黄斌
Owner CHINA PETROLEUM & CHEM CORP
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