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Filler extraction tower for dephenolizing coal gasification wastewater and extraction dephenolizing processing method

A technology of coal gasification wastewater and extraction tower, which is applied in the direction of extraction water/sewage treatment, etc. It can solve the problems of difficult to meet the wastewater discharge index, does not involve packing extraction tower, and exceeds the biochemical treatment load, etc., and is easy to install and maintain, and easy to install and maintain and promote decentralized effects

Inactive Publication Date: 2010-03-03
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are problems such as low extraction tower efficiency and easy blockage of extraction equipment
For example, after the coal gasification wastewater of Harbin Gasification Plant is extracted by the extraction tower, the total phenols are still as high as 1400mg/L, and the COD cr As high as 6000mg/L, it not only caused waste of phenol, but also seriously exceeded the biochemical treatment load after the wastewater entered the subsequent biochemical treatment section, making it difficult to meet the wastew

Method used

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  • Filler extraction tower for dephenolizing coal gasification wastewater and extraction dephenolizing processing method
  • Filler extraction tower for dephenolizing coal gasification wastewater and extraction dephenolizing processing method
  • Filler extraction tower for dephenolizing coal gasification wastewater and extraction dephenolizing processing method

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Experimental program
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Effect test

Embodiment 1

[0038] The total phenol content of a coal gasification wastewater entering a packed extraction tower is 6010mg·L -1 , the pH value is 6, the water temperature is 50°C, and the flow rate is 100 tons / hour.

[0039] The extraction tower is a packed tower, the height of the packing layer is 17.5m, the extraction agent is methyl isobutyl ketone, and the ratio of solvent to sewage is 1:6. The theoretical number of stages of the solvent recovery tower is 20, the pressure at the top of the tower is 0.11MPa, the temperature is 110°C, the pressure at the bottom of the tower is 0.12MPa, the temperature is 215°C, and the reflux ratio is 0.5. During operation, the phase interface in the upper amplification section of the extraction tower is easy to control, and the total phenol content in the treated wastewater is 280mg·L -1 , the phenol content in the recovery extraction solvent is about 80mg / l -1 , the content of extractant in crude phenol is about 800mg / l -1 . The removal rate of ph...

Embodiment 2

[0041] The total phenol content of the coal gasification sewage entering the packed extraction tower is 5680mg·L -1 , the pH value is 5, the water temperature is 50°C, and the flow rate is 60 tons / hour.

[0042] The extraction tower is a packed tower, the height of the packing layer is 17.5m, the extraction agent is methyl isobutyl ketone, and the ratio of solvent to sewage is 1:6. The theoretical number of stages of the solvent recovery tower is 20, the pressure at the top of the tower is 0.11MPa, the temperature is 110°C, the pressure at the bottom of the tower is 0.12MPa, the temperature is 215°C, and the reflux ratio is 0.5. The total phenol content in the treated wastewater is 260mg·L -1 , the phenol content in the recovery extraction solvent is about 74mg / l -1 , the content of extractant in crude phenol is about 750mg / l -1 . The removal rate of phenol was 95.4%, and the calibrated extraction grade was 5 grades.

Embodiment 3

[0044] The total phenol content of the coal gasification wastewater entering the packed extraction tower is 5540mg·L -1 , the pH value is 6.5, the water temperature is 50°C, and the flow rate is 80 tons / hour.

[0045] The extraction tower adopts a packed tower, the height of the packing layer is 17.5m, the extractant is diisopropyl ether, and the ratio of solvent to sewage is 1:10. The theoretical number of stages of the solvent recovery tower is 20, the pressure at the top of the tower is 0.11MPa, the temperature is 68°C, the pressure at the bottom of the tower is 0.12MPa, the temperature is 200°C, and the reflux ratio is 0.5. The total phenol content in the treated wastewater is 350mg·L -1 , the phenol content in the recovery extraction solvent is about 80mg / l -1 , the content of extractant in crude phenol is about 280mg / l -1 . The removal rate of phenol was 93.6%, and the calibrated extraction grade was 5 grades.

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Abstract

The invention discloses a filler extraction tower for dephenolizing coal gasification wastewater and an extraction dephenolizing processing method. A honeycomb grid filler layer of the filler extraction tower comprises a plurality of rectangular plate pieces and a rectangular baffle plate in a hollow cavity of the extraction tower, and each rectangular plate piece and the rectangular baffle plateare both provided with a plurality of tongue type holes; the spacing of the two adjacent rectangular plate pieces is 50-70mm, the rectangular baffle plate is inserted between the rectangular plate pieces, and a whole structure is arranged between the rectangular plate pieces and the rectangular baffle plate; and the extraction dephenolizing processing method comprises the following steps: sewage enters the extraction tower from a distributor between an amplification section at the upper section and the honeycomb grid filler layer, countercurrent extraction is carried out on the sewage and an extraction solvent entering from a lower distributor, and the extraction temperature is 30-60 DEG C. The invention adopts the filler extraction tower to realize the industrial application of the coal gasification wastewater having high concentration and containing phenol and has the characteristics of high extraction efficiency, large processing quantity, simple operation, low operation expense, easy installation and maintenance and the like. The total phenol removing rate is as high as more than 93%.

Description

technical field [0001] The invention relates to a packing extraction tower for dephenolizing coal gasification wastewater and a method for extracting dephenolization of coal gasification wastewater using the device. Background technique [0002] Coal gasification wastewater comes from highly polluted wastewater produced during gas washing. The water quality is complex. The pollutants mainly include ammonia, carbon dioxide, unit phenols, polyphenols, fatty acids, etc., and the content of hydrogen sulfide is small. In addition, it also contains a small amount of tar and fly ash. and other substances. Wastewater COD cr High value, difficult to biodegrade. Among them, especially phenols, there are many kinds and high concentrations. For example, China Coal Longhua Harbin Gasification Plant produces 100 tons of coal gasification wastewater per hour, and its phenol content is as high as 4500-7000 mg / L, and the polyphenol content is 1500-3500 mg / L, COD cr More than 20000mg / L. ...

Claims

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Application Information

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IPC IPC(8): C02F1/26
Inventor 钱宇陈赟高亚楼盖恒军周志远章莉娟孙玉江冯大春周永涛李秀喜宁秋实孟祥青吴昌祥
Owner SOUTH CHINA UNIV OF TECH
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