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Processing method of sewage storage tank discharging gas

A technology for exhaust gas and storage tank, which is applied in the field of treatment of exhaust gas from acid sewage storage tanks, can solve the problems of difficulty in stable operation of compressors, high operating costs, gas backflow into storage tanks, etc., so as to reduce equipment investment and operating costs. , Guarantee the effect of purification treatment and low operating cost

Active Publication Date: 2008-08-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is a combination of two typical oil and gas recovery processes. The disadvantage is that the process is long and the operating cost is high.
The disadvantage of this method is that when the flow of oil and gas is unstable, especially when the amount of oil and gas fluctuates greatly, it is difficult for the compressor to operate stably
In practical applications, especially in the treatment of breathing gas in oil storage tanks, the gas volume changes greatly, and even the phenomenon of gas backflow into the storage tank occurs. Therefore, in this case, the oil-gas compression cooling-adsorption process cannot be applied

Method used

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  • Processing method of sewage storage tank discharging gas
  • Processing method of sewage storage tank discharging gas
  • Processing method of sewage storage tank discharging gas

Examples

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Effect test

Embodiment 1

[0023] An enterprise's sour water storage tank emits about 1000m3 of gas 3 / h, the composition of main odor pollutants is shown in Table 1. The side line extraction condensation of the stripping tower is three-stage condensation, wherein the weight concentration of the subcondensed liquid ammonia in the third-stage condensation is about 30%. The above-mentioned third-stage condensation and segregation liquid is used as the first-stage absorption liquid for the purification treatment of the exhaust gas of the acidic water storage tank.

[0024] The first stage adopts packing purification tower, and the packing is Dg50 plastic Pall ring. The diameter of the first-stage elutriation tower is 600mm, and the height of the packing layer is 3000mm. The eluent comes from the acidic water stripping ammonia gas three-stage condensing system, the ammonia weight concentration is 30%, and the liquid-gas ratio is 4-8L / m 3 .

[0025] In the second stage of cooling and adsorption, the refri...

Embodiment 2

[0032] According to the method described in Example 1, wherein the filler adopts Dg38 stainless steel saddle ring. The diameter of the first-stage eluting tower is 600mm, and the height of the packing layer is 2600mm. The eluent comes from the acidic water stripping ammonia gas condensate system, which is a mixed solution of the second-stage condensate and the third-stage condensate, and the weight concentration of ammonia is 20%. , liquid-gas ratio 5 ~ 10L / m 3 .

[0033] In the second-stage cooling adsorption, the refrigerant is liquid ammonia from the stripping process, and the temperature of the exhaust gas at the outlet is controlled at 3°C. The condensed water generated by the cooler is discharged into the oily sewage treatment system. The adsorbent is ordinary commercially available dehydrocarbon activated carbon. Airspeed is 600h -1 , the two adsorption towers are switched to use, and the maximum temperature of the adsorbent bed is about 52°C. When the concentration o...

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Abstract

The present invention provides a purifying treating method of sour water storage tank discharging. The sour water storage tank discharging of the invention is purified via two purifying treatments, the first treatment employs segregating liquid or stripped purifying water of the segregating course rich in ammonia in the stripped process of the sour water as absorption liquid, the second treatment employs cooling absorption process, the cooling process employs liquid ammonia vaporization refrigeration in the sour water stripped process, ammonia after vaporization returns to the ammonia liquefying system in the stripped process, the absorption course employs at least two active carbon beds switching operation, employs steam regeneration after absorption saturation of active carbon, the active carbon absorption steam comes from a reboiler at the bottom in the course of stripped process. The invention organical combination the stripped process of the sour water and the purifying treatment process of the sour water storage tank discharging, not only removes the malodorous substance in the sour water storage tank discharging, but alos effectively recovers hydrocarbons. The process method has simple equipment, lower cost and has no potential safety hazard.

Description

technical field [0001] The invention relates to a treatment method for exhaust gas from an acidic sewage storage tank, in particular to a method for purifying the exhaust gas from an acidic sewage storage tank containing sulfide, ammonia, volatile hydrocarbons, etc. in petroleum refining enterprises and some petrochemical enterprises . Background technique [0002] In petroleum refining enterprises and some petrochemical enterprises, a kind of acid sewage containing hydrogen sulfide, organic sulfur sulfide, ammonia, volatile organic compounds (VOC) and other pollutants will be produced. These sewage cannot be discharged directly, and water vapor is generally used to The hydrogen sulfide and ammonia are treated and recovered by the stripping method, and the purified water after stripping can be reused as process water or sent to the sewage treatment plant for further treatment and discharge. [0003] Acidic sewage stripping can generally adopt double-tower stripping process ...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/04B01D53/14C02F1/04
Inventor 刘忠生方向晨郭兵兵
Owner CHINA PETROLEUM & CHEM CORP
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