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A method of freezing and concentrating coal chemical industry wastewater

A coal chemical wastewater, freeze concentration technology, applied in the direction of frozen water/sewage treatment, chemical instruments and methods, filtration treatment, etc., can solve the problems of difficult separation, introduction of refrigerant, difficult control of ice crystal formation process, etc.

Active Publication Date: 2017-09-26
SYNFUELS CHINA INNER MONGOLIA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when freezing by direct heat exchange, the ice crystal formation process is not easy to control, and the material is operated under a certain pressure, which requires relatively high equipment requirements; in addition, due to the direct contact between the refrigerant and the wastewater, the refrigerant may be introduced into the wastewater. make it difficult to separate

Method used

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  • A method of freezing and concentrating coal chemical industry wastewater
  • A method of freezing and concentrating coal chemical industry wastewater
  • A method of freezing and concentrating coal chemical industry wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The 30000kg / h coal-water slurry gasification black water 1 from the upstream unit is filtered 2, cooled down to 15°C; mixed with the wastewater concentrate from the bottom, and sent to the heat exchanger 4 as the feed 3 to be mixed with the refrigerant 5. Heat exchange; the temperature of the heat exchanger is -22°C. After the heat exchange, the ice slurry 6 containing small ice crystals is sent to the recrystallizer 7 to make the ice crystals grow up and be purified; 7. Carry out cyclic material exchange; during the cyclic exchange process, the ice crystals gradually grow and the number of ice crystals gradually increases; through the pressure change in the cleaning tower 9, the pressure variation range is 0 to 4bar, after the ice slurry 8 is sucked into the cleaning tower 9 Squeeze to separate the ice crystals from the concentrate. After cleaning and melting the ice crystals at the top of the cleaning tower, discharge 28,500 kg / h of regenerated water 11 (the ratio of t...

Embodiment 2

[0043]The 30000kg / h Lurgi gasified black water 1 from the upstream unit is filtered 2 and then cooled to room temperature; after being mixed with the concentrated liquid from the bottom, it is sent as feed 3 to the heat exchanger 4 to exchange heat with the refrigerant 5; The temperature of the heat exchanger is -20°C. After the heat exchange, the ice slurry 6 containing small ice crystals is sent to the recrystallizer 7 to make the ice crystals grow up and be purified; the ice slurry is circulated and exchanged between the heat exchanger 4 and the recrystallizer 7 ; During the circulation and exchange process, the ice crystals grow gradually and the number of ice crystals gradually increases; through the pressure change in the cleaning tower 9, the pressure variation range is 0 to 3.5 bar, the ice slurry 8 is sucked into the cleaning tower 9 and squeezed, so that The ice crystals are separated from the concentrated solution, and the 28636kg / h regenerated water 11 is discharged...

Embodiment 3

[0048] 30000kg / h Fischer-Tropsch synthetic water from upstream unit 1 Add 150kg / h Ca(OH) in pretreatment unit 2 2 After neutralization, the pH value is 6.91, mixed with the concentrated liquid from the bottom as feed 3, feed 3 is sent to heat exchanger 4 to exchange heat with refrigerant 5, and the temperature of heat exchanger is -26°C; heat exchange Finally, the ice slurry 6 containing small ice crystals is sent to the recrystallizer 7 to make the ice crystals grow up and be purified; the ice slurry is circulated and exchanged at the heat exchanger 4 and the recrystallizer 7; during the circulation exchange process, the ice crystals gradually The number of grown ice crystals gradually increases; through the pressure change in the cleaning tower 9, the pressure range is 0-4.0bar, the ice slurry 8 is sucked into the cleaning tower 9 and squeezed, so that the ice crystals and the concentrated solution are separated, and the ice crystals are cleaned and melted. Discharge 26000kg...

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Abstract

The invention provides a method for refrigeration condensation treatment on coal chemical industry waste water. The method comprises pre-treating coal chemical industry waste water, carrying out pre-cooling to a room temperature or less, carrying out heat change through a heat exchanger to obtain ice slurry with small-sized ice crystals, feeding the ice slurry into a re-crystallization device, carrying out recycling material exchange on the ice slurry in the heat exchanger and the re-crystallization device, feeding the ice slurry in the re-crystallization device into a washing tower, separating ice crystals and the waste water concentrate, pre-heating to melt the ice crystals at the top of the washing tower to obtain reclaimed water, and discharging the waste water concentrate from the bottom of the washing tower. The refrigeration condensation technology is carried out at a low temperature under normal pressure, is safe and reliable in operation and does not easily block a pipe. After treatment on coal-chemical engineering waste water, salt and organic matter content of the coal-chemical engineering wastewater is reduced and TDS and COD of the coal-chemical engineering waste water are reduced. The produced reclaimed water can be directly used as circulating cooling water. Pollutes in waste water are enriched in the concentrate so that a waste water treatment amount in deep treatment is reduced. Through combination with a waste water deep treatment process, zero discharge of coal-chemical engineering waste water is realized.

Description

technical field [0001] The invention relates to a method for freezing and concentrating coal chemical industry wastewater. Background technique [0002] Coal chemical wastewater mainly includes coking wastewater, coal gasification black water, coal direct / indirect liquefaction wastewater, and wastewater generated during the preparation of synthesis gas conversion catalysts. Huge water consumption and wastewater discharge are a prominent problem that restricts the development of the coal chemical industry. question. If the above wastewater can be recycled, the goals of saving water resources and environmental protection can be achieved, and the coal chemical industry can realize clean production. [0003] Generally, the treatment methods of coal chemical wastewater mainly include pretreatment process + biochemical treatment process + wastewater reuse treatment + concentrated brine treatment + concentration and evaporation and drying processes, etc. It mainly removes substan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/22C02F9/04C02F9/06C02F9/14
CPCC02F1/001C02F1/04C02F1/22C02F1/40C02F1/441C02F1/4672C02F1/4693C02F1/52C02F1/66C02F1/72C02F1/722C02F1/725C02F1/78C02F3/00C02F9/00C02F2001/007C02F2103/34C02F2209/02C02F2209/03C02F2305/026C02F2305/06C02F2305/10
Inventor 耿春宇高琳李连峰冯胜科李向阳郝栩杨勇李永旺
Owner SYNFUELS CHINA INNER MONGOLIA CO LTD
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