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Concentration homogenization method of hydrocarbon-containing waste gas

A waste gas and concentration technology, which is applied in the direction of chemical instruments and methods, separation methods, and dispersed particle separation, can solve the problems of limited concentration homogenization effect and limited adsorption capacity of high-concentration hydrocarbon-containing waste gas, and achieve good concentration homogenization effect, Conducive to stable operation and large buffer capacity

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, due to the limited adsorption capacity of solid adsorbents, and the strong adsorption capacity of solid adsorbents for hydrocarbon components, it is not easy to desorb, so this method is generally only applicable to the concentration homogenization of relatively low concentration exhaust gas. The effect needs to be further improved, especially for the concentration homogenization effect of high-concentration hydrocarbon-containing waste gas.

Method used

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Effect test

Embodiment 1

[0020] The hydrocarbon-containing waste gas discharged from an acidic water tank, due to the quality of the influent water, in the exhaust gas caused by water inflow, drainage and temperature changes, the volume content of hydrocarbons varies within the range of 1% to 12%, and the average concentration within a certain period is 5 %about.

[0021] Diesel oil with a distillation range temperature of 220-350°C is used as solvent oil, and a bubble column is used. A gas distributor is installed in the middle of the bubble column for secondary gas-liquid contact distribution. The hydrocarbon-containing waste gas enters the bubble column from the bottom of the column. Exhausted from the top of the tower, the volume space velocity of the exhaust gas is 1000h -1 , after 48 hours of stable operation, the concentration of hydrocarbons in the exhaust fluctuates in the range of 4.2% to 7.8% (volume).

Embodiment 2

[0023] The concentration of total hydrocarbons in the discharge gas from a certain alkali slag tank farm ranges from 3% to 20% (volume), and the average concentration within a period of time is 8% (volume).

[0024] Diesel oil with a distillation range temperature of 250-380°C is used as solvent oil, and a spray packed tower is used. The circulating solvent oil circulates from the bottom of the tower to the top of the tower, and the hydrocarbon-containing waste gas enters the spray packed tower from the bottom of the tower, and is discharged from the top of the tower. The shower tower adopts stainless steel Pall ring packing with a packing of Φ25mm×25mm×2mm, and the spray liquid-gas ratio is 30L / m 3 , the volume space velocity of exhaust gas is 800h -1 , after 48 hours of stable operation, the concentration of hydrocarbons in the exhaust fluctuates in the range of 6% to 12% (volume).

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Abstract

The invention discloses a concentration homogenization method of hydrocarbon-containing waste gas. The method comprises the following steps: contacting the hydrocarbon-containing waste gas with high boiling point solvent oil, then performing gas-liquid separation, using the separated gas phase to perform the post-treatment, and recycling the separated liquid phase, wherein the high boiling point solvent oil is a distillate with the initial boiling point of more than 200 DEG C. In the method disclosed by the invention, the solvent oil with high boiling point and low volatility is used as the absorbent, when the concentration of hydrocarbon in the gas is higher, hydrocarbons are absorbed by the absorbent and the hydrocarbon concentration of the discharged gas is reduced; when the concentration of hydrocarbon in the gas is lower, the hydrocarbons absorbed by the absorbent are released under the gas stripping action and the hydrocarbon concentration of the discharged gas is increased; andthe concentration homogenization treatment of the gas can be realized through the absorption-desorption process of hydrocarbons. The method disclosed by the invention, the high boiling point solvent oil is used as the concentration homogenization medium of the hydrocarbon-containing waste gas, thus the method has the advantages of large buffer capacity, good concentration homogenization effect and the like and the method is especially suitable for the concentration homogenization treatment of the waste gas with higher hydrocarbon concentration.

Description

technical field [0001] The invention relates to a method for pretreatment of hydrocarbon-containing waste gas, in particular to a method for concentration homogenization of hydrocarbon-containing waste gas before further recovery and treatment. Background technique [0002] In the process of petroleum processing and petrochemical production, gas containing hydrocarbons is often discharged and needs to be treated, such as acid sewage storage tank discharge gas, waste oil or oil product storage tank discharge gas, alkali residue storage tank discharge gas, sewage treatment plant discharge gas, etc. If it is not recycled effectively, it will cause a lot of waste of resources on the one hand, and cause serious environmental pollution on the other hand, and there are also certain hidden dangers at the same time. [0003] The recovery and treatment methods of hydrocarbon-containing waste gas generally include absorption method, adsorption method, condensation method, membrane oil ...

Claims

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Application Information

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IPC IPC(8): B01D53/14B01D53/18
Inventor 刘忠生王新王海波齐慧敏
Owner CHINA PETROLEUM & CHEM CORP
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