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Device and method for processing acid gas of refinery plant

A treatment device and acid gas technology, applied in separation methods, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of health damage of operators, poor operation safety, complicated process, etc., and achieve no secondary pollution and low operating costs Low cost and simple equipment

Inactive Publication Date: 2014-03-19
CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is complicated, the production environment is harsh, and the operation safety is poor, leaving major hidden dangers to environmental pollution and health damage to operators.

Method used

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  • Device and method for processing acid gas of refinery plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The acid tail gas characteristic of a refinery is H 2 S is 66.8%, CO 2 1.75% for hydrocarbons, air and others for 31.45%.

[0022] The acid gas raw material is passed through the liquid separation tank 1, and the preliminary gas-liquid separation process occurs. The separated gas enters from the air inlet at the lower part of the supergravity machine 2, and the amine absorbent DEA enters from the upper liquid inlet of the supergravity machine 2. contact, where the H 2 S is absorbed, the operating pressure of the supergravity machine 2 is controlled at about 0.05MPa, and the operating temperature is controlled at 25°C; the liquid at the bottom of the supergravity machine 2 is pumped into the absorbent regeneration tower 4, and the temperature is raised to 120°C, so that the absorbent and H 2 S gas-liquid separation, the proposed purer H 2 S gas enters the lye spray tower 5 from the air inlet at the lower part of the lye spray tower 5, pumps the absorbent liquid separa...

Embodiment 2

[0024] The acid tail gas characteristic of a refinery is H 2 S is 76.53%, CO 2 2.2% for hydrocarbons, air and others for 21.27%.

[0025] The acid gas raw material is passed through the liquid separation tank 1, and a preliminary gas-liquid separation process occurs. The separated gas enters from the air inlet at the lower part of the supergravity machine 2, and the amine absorbent DIPA that enters from the upper liquid inlet of the supergravity machine 2 contact, where the H 2 S is absorbed, the operating pressure of the supergravity machine 2 is controlled at about 0.05MPa, and the operating temperature is controlled at 25°C; the liquid at the bottom of the supergravity machine 2 is pumped into the absorbent regeneration tower 4, and the temperature is raised to 125°C, so that the absorbent and H 2 S gas-liquid separation, the proposed purer H 2 S gas enters the lye spray tower 5 from the air inlet at the lower part of the lye spray tower 5, pumps the absorbent liquid sep...

Embodiment 3

[0027] The acid tail gas characteristic of a refinery is H 2 S is 85.28%, CO 2 8.2% for hydrocarbons, air and others for 6.52%.

[0028] The acid gas raw material is passed through the liquid separation tank 1, and a preliminary gas-liquid separation process occurs. The separated gas enters from the air inlet at the lower part of the supergravity machine 2, and the amine absorbent MDEA enters from the upper liquid inlet of the supergravity machine 2. contact, where the H 2 S is absorbed, the operating pressure of the supergravity machine 2 is controlled at about 0.05MPa, and the operating temperature is controlled at 35°C; the liquid at the bottom of the supergravity machine 2 is pumped into the absorbent regeneration tower 4, and the temperature is raised to 110°C, so that the absorbent and H 2 S gas-liquid separation, the proposed purer H 2 S gas enters the lye spray tower 5 from the air inlet at the lower part of the lye spray tower 5, pumps the absorbent liquid separate...

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Abstract

The invention relates to a device for processing acid gas of a refinery plant. The device comprises a liquid separating tank, a supergravity machine, an absorbent regeneration tower, an absorbent storing tank, an alkali liquid spraying tower and an alkali liquid storing tank, wherein an air outlet of the liquid separating tank is communicated with an air inlet at the lower part of the supergravity machine; a liquid outlet at the bottom of the supergravity machine is connected to the absorbent regeneration tower through a liquid outlet pipe with a pump, and a liquid outlet at the bottom of the absorbent regeneration tower is communicated with the absorbent storing tank; a liquid outlet of the absorbent storing tank is communicated with a liquid inlet at the upper part of the supergravity machine, an air outlet at the top of the absorbent regeneration tower is communicated with an air inlet at the lower part of the alkali liquid spraying tower, and a liquid inlet at the top of the alkali liquid spraying tower is communicated with a liquid outlet of the alkali liquid storing tank. The device provided by the invention has the advantages that the supergravity technology is adopted to process the acid gas of the refinery plant, the H2S content after purifying reach 99%, H2S is continuously absorbed by adopting alkali liquid in a circulating manner to prepare NaHS, the equipment is simple, the investment is small, the desulphurization efficiency is high, the device does not have secondary pollution, and the device has the efficient resource utilization rate.

Description

technical field [0001] The invention relates to a treatment device and method for acid gas in small and medium-sized refineries. Background technique [0002] Refinery acid gas is a kind of processing tail gas produced in the process of petroleum processing, and its main component is H 2 S. Large-scale refineries have a large amount of acid gas, and generally build acid gas treatment devices for sulfur production. 2 S is recycled and utilized. For small and medium-sized refineries, due to the small amount of acid gas, the cost of setting up a sulfur plant is relatively high. Generally, the acid gas is directly introduced into the flare (or boiler) for combustion to generate SO 2 High-altitude emissions, causing serious environmental pollution. With the enhancement of people's awareness of environmental protection, and to ensure the full utilization of resources, H must be 2 S for recycling. There are many effective recycling methods in the industry. Among these methods,...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/52B01D53/14B01D53/24C01B17/32
Inventor 黄益平陈英才徐义明陆晓咏周俊超岳昌海倪嵩波
Owner CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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