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, etc., and achieve the effect of avoiding separate treatment, reducing discharge, and having large operation flexibility.
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[0025] Example 1
[0026] The acid sewage from the coal-to-liquid plant contains high sulfur and ammonia. The hydrogen sulfide concentration is 48,000 ppm and the ammonia concentration is 31,000 ppm. 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 is pumped to the oil eliminator 3 to further remove the tiny oil droplets in the water.
[0027] The degreasing acidic sewage is sent out by the pump in two parts under flow control. Among them, the acidic sewage, which accounts for 47% of the total weight of the sewage, enters the upper packing section of the first stripping tower 4 as a cold feed, and the remaining acidic sewage passes through the sewage -After the purifi...
Example Embodiment
[0031] Example 2
[0032] The acidic sewage from the coal-to-liquid plant contains high sulfur and ammonia. The hydrogen sulfide concentration is 11,000 ppm and the ammonia concentration is 18,000 ppm. 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 is pumped to the oil eliminator 3 to further remove the tiny oil droplets in the water.
[0033] The degreasing acidic sewage is sent out by the pump in two parts under flow control. The acidic sewage, which accounts for 10% of the total weight of the sewage, enters the packing section of the first stripping tower as a cold feed, and the rest is exchanged by sewage-purified water. After the device 5 is heated to 118°C, it...
Example Embodiment
[0037] Example 3
[0038] The acidic sewage from the coal-to-liquid plant contains high sulfur and ammonia. The hydrogen sulfide concentration is 54,000 ppm and the ammonia concentration is 35,000 ppm. 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 is pumped to the oil eliminator 3 to further remove the tiny oil droplets in the water.
[0039] The degreasing acidic sewage is sent out by the pump in two parts under flow control. Among them, the acidic sewage, which accounts for 47% of the total weight of the sewage, enters the packing section of the first stripper 4 as a cold feed, and the remaining acidic sewage passes through the sewage- After the purified water h...
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