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Concentration homogenization method of hydrocarbon-containing waste gas

A waste gas and concentration technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., 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: 2013-08-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Concentration homogenization method of hydrocarbon-containing waste gas

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Comparison scheme
Effect test

Embodiment 1

[0020] The hydrocarbon-containing waste gas discharged from an acid water tank, the volume content of hydrocarbon substances in the exhaust gas caused by the change of water quality, water inlet, drainage and temperature 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 bubbling tower is used. A gas distributor is set in the middle of the bubbling tower for secondary gas-liquid contact distribution. The top of the tower is discharged, and the volumetric air 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] In the exhaust gas of a certain alkali residue tank area, the total hydrocarbon concentration varies in the range of 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 packing tower is used. The circulating solvent oil is circulated from the bottom of the tower to the top of the tower, and the hydrocarbon-containing waste gas enters the spray packing tower from the bottom of the tower, and is discharged from the top of the tower. The spray tower adopts stainless steel Pall ring packing with Φ25mm×25mm×2mm, and the spray liquid-gas ratio is 30L / m 3 , the volume air velocity of the 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 present invention relates to a pretreatment method for hydrocarbon-containing waste gas, in particular to a concentration homogenization method for 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 exhaust gas, sewage oil or oil storage tank exhaust gas, alkali residue storage tank exhaust gas, sewage treatment plant exhaust gas, etc. , If not effectively recycled, on the one hand, it will cause a lot of waste of resources, on the other hand, it will cause serious environmental pollution, and there are also certain safety hazards. [0003] The recovery and treatment methods of hydrocarbon-containing waste gas generally include absorption method, adsorption method, condensation method, membrane oil and gas recovery technology,...

Claims

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Application Information

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