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Two-tower stripping treatment method for sewage in coal chemical engineering equipment

A technology of coal chemical industry and stripping, applied in the field of coal chemical industry, can solve the problems of unsatisfactory acid sewage treatment effect, and achieve the effect of avoiding separate treatment, reducing air pollution and reducing treatment costs

Active Publication Date: 2012-01-11
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for stripping sewage with two towers, which can overcome the defects of unsatisfactory treatment effect on acid sewage of coal chemical plant in the prior art

Method used

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  • Two-tower stripping treatment method for sewage in coal chemical engineering equipment
  • Two-tower stripping treatment method for sewage in coal chemical engineering equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Acid sewage with high sulfur and ammonia content from coal-to-liquids plant, in which the concentration of hydrogen sulfide is 48000ppm and the concentration of ammonia is 31000ppm. The sewage first enters the sewage degassing tank 1 to remove oil and gas, and the removed oil and gas are discharged to the incinerator of the sulfur recovery device. Under the control of the liquid level, the sewage at the bottom of the tank is pumped into the sewage storage tank 2, where it stands for a long time to remove most of the oil in the water, and then pumped to the degreaser 3 to further remove tiny oil droplets in the water.

[0027] The acidic sewage after deoiling is divided into two parts by the pump under the flow control, and the acidic sewage accounting for 47% of the total weight of the sewage enters the upper packing section of the first stripper 4 as cold feed, and the remaining acidic sewage is passed through the sewage - After the purified water heat exchanger 5 is h...

Embodiment 2

[0032] Acid sewage with high sulfur and ammonia content from coal-to-liquids plant, in which the concentration of hydrogen sulfide is 11000ppm and the concentration of ammonia is 18000ppm. The sewage first enters the sewage degassing tank 1 to remove oil and gas, and the removed oil and gas are discharged to the incinerator of the sulfur recovery device. Under the control of the liquid level, the sewage at the bottom of the tank is pumped into the sewage storage tank 2, where it stands for a long time to remove most of the oil in the water, and then pumped to the degreaser 3 to further remove tiny oil droplets in the water.

[0033] The acidic sewage after oil removal is divided into two parts by the pump under flow control, among which the acidic sewage accounting for 10% of the total weight of the sewage enters the packing section of the first stripping tower as cold feed, and the rest is exchanged by sewage-purified water After being heated to 118°C by the tank 5, it exchan...

Embodiment 3

[0038] Acid sewage with high sulfur and ammonia content from coal-to-liquids plant, in which the concentration of hydrogen sulfide is 54000ppm and the concentration of ammonia is 35000ppm. The sewage first enters the sewage degassing tank 1 to remove oil and gas, and the removed oil and gas are discharged to the incinerator of the sulfur recovery device. Under the control of the liquid level, the sewage at the bottom of the tank is pumped into the sewage storage tank 2, where it stands for a long time to remove most of the oil in the water, and then pumped to the degreaser 3 to further remove tiny oil droplets in the water.

[0039] The acidic sewage after oil removal is divided into two parts by the pump under flow control, and the acidic sewage accounting for 47% of the total weight of the sewage enters the packing section of the first stripper 4 as cold feed, and the remaining acidic sewage is passed through the sewage- After the purified water heat exchanger 5 is heated to...

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Abstract

The invention discloses a two-tower stripping treatment method for sewage in coal chemical engineering equipment, which comprises the following steps: sour sewage is subjected to oil gas removing and oil removing and then enters a first stripping tower (4), acidic gas is separated from the top of the first stripping tower, desulphurized water at the bottom of the tower enters a second stripping tower (10), and purified water is exhausted from the bottom of the second stripping tower; gas separated from the top of the second stripping tower is cooled down and then subjected to liquid-gas separation, the separated gas is cooled and segregated, the obtained segregated liquid returns to a sewage storage tank (2), and the obtained segregated gas enters a gas ammonia refining system. In the invention, the two-tower stripping process is utilized, thereby reducing the exhaustion of sulfides and nitrides, relieving air pollution and simultaneously recovering sulfur and ammonia.

Description

technical field [0001] The invention relates to sewage treatment technology in the field of coal chemical industry, in particular to a method for treating sulfur-containing and ammonia-containing sewage in a large-scale coal chemical plant by a double-tower steam stripping method, especially a method for treating high-concentration sewage in a coal liquefaction plant. Background technique [0002] Coal chemical equipment, especially industrial processes such as coal-to-oil, coal liquefaction, coal gasification, coal-to-hydrogen, and coal-to-natural gas, often produce acidic sewage containing more hydrogen sulfide and ammonia. The sewage composition of industrial processes such as industrial processes is more complex and more difficult to treat. If it is not treated in time, it will seriously pollute the environment and cause the loss of effectively used resources. At present, the treatment method of acid sewage containing hydrogen sulfide and ammonia is mainly applicable to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/04C02F1/20C01C1/12
Inventor 蔡丽娟黄泽川
Owner CHNA ENERGY INVESTMENT CORP LTD
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