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Sewage storage tank exhaust air-release purification processing method

A technology for discharging gas and storage tanks, which is applied in the direction of heating water/sewage treatment, chemical instruments and methods, and separation methods. The effect of low running cost

Active Publication Date: 2008-03-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of this method is relatively complicated, a special absorbent is required, and the purification effect on hydrocarbons is not ideal

Method used

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  • Sewage storage tank exhaust air-release purification processing method

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Embodiment 1

[0020] 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. The absorbent is hydrorefined by catalytic cracking diesel fraction, and then the distillate oil at 250-360°C is distilled out. The kinematic viscosity of the absorbent at 40°C is 4mm 2 / s, freezing point -20°C.

[0021] Table 1 Concentration of main odor pollutants in the discharge gas of acidic water storage tanks

[0022] Main types of odor

[0023] The acid sewage storage tank adopts two-stage purification operation. The purific...

Embodiment 2

[0028] 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 12~15L / m 3 The diameter of the second-stage absorption tower is 700mm, and the height of the packing layer is 3500mm. The absorbent is distilled and separated from petroleum atmospheric distillate oil at 300-380°C. Distillate oil obtained from butylphenol (40°C kinematic viscosity is 30mm 2 / s, freezing point -5°C) or squalane (isotriacane), liquid-gas ratio 6-8L / m 3 . The operating temperature of the first-stage rinsing and the second-stage rinsing is controlled at 35°C to 45°C. The eluent of the first-stage packed tower is re...

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Abstract

The invention relates to a purification processing method of the discharge gas of an acid waste water tank, belongs to waste gas purification treatment technology. The invention makes the discharge gas of the acid waste water tank process two-stage purification treatment: the first stage purification treatment uses segregation liquid in the process of rich ammonia segregation in the acid waste water stripping process or stripping purified water as absorption liquid; the purification treatment in the second stage uses property stable and high boiling point solvent oil and so on as absorbent. The invention organically combines the acid waste water stripping process with the purification treatment process of the acid waste water tank discharge gas, which not only can remove the odorous substances in the acid waste water tank discharge gas, but also can effectively reclaim hydrocarbon substances. The invention has simple devices and low operation cost, and has no potential safety hazard.

Description

technical field [0001] The invention relates to a method for purifying the discharge gas of a sewage storage tank, in particular to a method for purifying the discharge gas of an acid sewage storage tank containing sulfide, ammonia and volatile organic compounds (VOC) in petroleum refining enterprises and some petrochemical enterprises. Purification treatment method. 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...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/14C02F1/04
Inventor 方向晨刘忠生任龙赵威郭兵兵
Owner CHINA PETROLEUM & CHEM CORP
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