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Method for treating coal gasification wastewater by single-tower pressurization stripping and device therefor

A technology for coal gasification wastewater and stripping, which is applied in chemical instruments and methods, separation methods, degassed water/sewage treatment, etc., can solve problems such as affecting the efficiency and normal operation of equipment, inability to reduce pollution loads, and unbearable economy. Achieve the effect of improving the extraction effect, saving the amount of caustic soda, and reducing the processing load

Inactive Publication Date: 2009-05-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Ionic PhO - The hydrophilicity of the group is enhanced, and the solubility in water is greatly improved, which leads to the deterioration of the extraction effect
An effective measure to improve the extraction effect is to reduce the pH during extraction to below 7, but due to the presence of ammonia, more than 40 kg of hydrochloric acid needs to be added per ton of water, which is economically unbearable
Therefore, under the current process, the pollution load cannot be reduced to a level that meets the requirements of the biochemical section
[0006] Severe fouling and blockage of equipment in the existing process
Due to CO 2 The residual amount is high, and the deamination is carried out at the end, so there is always more CO in the operation process 2 Coexist with ammonia, the two are easy to combine to produce ammonium salt crystals (ammonium bicarbonate, ammonium carbonate) and deposit on the wall of the equipment, which affects the efficiency and normal operation of the equipment

Method used

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  • Method for treating coal gasification wastewater by single-tower pressurization stripping and device therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The flow rate is 88 tons / hour, and the total phenol content is about 6400mg·l -1 (Volatile phenol about 3200mg l -1 , fatty acid about 3000mg·l -1 ); the total ammonia content is 7800mg l -1 , CO 2 About 4200mg·l -1 , oil content 350mg·l -1 , COD Cr The value is about 25000mg·l -1 , with a pH value of 10 and a water temperature of 80°C, the waste water to be treated is figure 1 process as shown. The parameters such as the number of stages, pressure and temperature of each tower are as follows:

[0031] Theoretical stages of the oleic acid gas and ammonia stripping tower are 25, the upper part of the feed inlet is bulk packing, the lower part of the feed inlet is a slanted hole tray, the temperature at the top of the tower is 60°C, the pressure is 0.32MPa, the temperature at the bottom of the tower is 138°C, and the pressure is 0.34 MPa. The side line production temperature is 133°C, the pressure is 0.33MPa, and the washing water volume of the acid gas scrubber...

Embodiment 2

[0036] The flow rate is 60 tons / hour, and the total phenol content is about 5500mg·l -1 (Volatile phenol about 3000mg·l -1 , the fatty acid is about 3120mg·l -1 ), total ammonia 5900mg·l -1 , CO 2 About 6000mg·l -1 , oil content 400mg·l -1 , COD Cr The value is about 23000mg·l -1 , the pH value is 9.5, and the wastewater to be treated at a water temperature of 80°C is figure 1 process as shown. The parameters such as the number of stages, pressure and temperature of each tower are as follows:

[0037] The temperature at the top of the oleic acid gas and ammonia stripping tower is 55°C, the pressure is 0.4MPa, the temperature at the bottom of the tower is 148°C, and the pressure is 0.43MPa. The side line production temperature is 141°C and the pressure is 0.42MPa.

[0038] The height of the packing layer of the extraction tower is 14m, diisopropyl ether is used as the extraction agent, the pH is adjusted by adding acid before extraction, the solvent ratio is 1:6, the ...

Embodiment 3

[0043] The flow rate is 100 tons / hour, and the total phenol content is about 5300mg·l -1 (Volatile phenol about 2600mg·l -1 , fatty acid about 2800mg·l -1 ), total ammonia 6000mg·l -1 , CO 2 About 9000mg·l -1 , oil content 400mg·l -1 , COD Cr The value is about 22000mg·l -1 , with a pH value of 10 and a water temperature of 80°C, the waste water to be treated is figure 1 process as shown. The parameters such as the number of stages, pressure and temperature of each tower are as follows:

[0044] The height of the packing layer of the extraction tower is 10m, the extraction agent is methyl isobutyl ketone, the pH is adjusted by adding acid before extraction, and the solvent ratio is 1:6. The rest of the conditions are the same as Example 1.

[0045] The total phenol content in the treated wastewater is 320mg·l -1 , the total ammonia content is less than 80mg·l -1 , COD Cr About 3300mg·l -1 , the extractant is less than 10mg·l -1 , after biochemical treatment, the...

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Abstract

The invention discloses a gasification wastewater disposing method and device through single-tower pressurizing stripping, which comprises the following steps: entering the extracted of acid gas or ammonia gas of cold and hot coal gasification wastewater from band lateral line in the stripping tower from top and upper top; blending gas; dividing phases; washing; separating light oil and acid gas; preparing liquid ammonia through two-grade concreting and refining; separating crude phenol and organic solvent from bottom of tower through inversed-extracting autoclave liquid and organic solvent; recycling organic solvent through stripping. The gasification disposing device contains oil acid gas / ammonia stripping tower, extracting tower, acid gas washing tower, solvent stripping tower, solvent recycling tower, oil-water separator, dephlegmator, pump and reservoir.

Description

technical field [0001] The invention relates to a treatment and recovery method of coal gasification wastewater, in particular to a method for treating coal gasification wastewater by pressurized steam stripping in a single tower. [0002] The invention also relates to a device for implementing the above method. Background technique [0003] With the continuous rise of oil prices, the application of coal in the fields of energy and chemical industry has been paid more and more attention. Coal gasification is an effective way to use coal cleanly and efficiently, and it is widely used in industries such as coal-to-gas, synthetic ammonia, and coal-fired power generation. The Lurgi pressurized gasification process is one of the most widely used gasification processes at present. During this process, a large amount of highly polluted wastewater is produced, of which: COD Cr Content at 20000mg·l -1 Above, it is alkaline, and the water quality is very complicated. Wastewater al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/20C02F1/26C02F1/40
Inventor 钱宇盖恒军江燕斌章莉娟李秀喜
Owner SOUTH CHINA UNIV OF TECH
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