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Treating method for discontinuous small-flow light-dydrocarbon-containing tail gas at low light dydrocarbon concentration

A treatment method and low-flow technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of high energy consumption and unsuitable condensation method for hydrocarbon tail gas recovery and treatment, and achieve high treatment efficiency and savings. Energy and energy saving effect

Active Publication Date: 2016-10-12
SHANGHAI LEADER CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its process treatment method is mainly adsorption and condensation, which is not suitable for the recovery and treatment of hydrocarbon tail gas with low concentration of light hydrocarbon components.
[0008] Patent CN 101793456 B uses multi-stage condensation, inter-stage pressurization, and recovery of low-temperature tail gas cooling capacity to recover volatile hydrocarbons. It is mainly determined to be multi-stage condensation. The cryogenic temperature is as low as -95°C, and the energy consumption is very high. Applicable to the treatment of hydrocarbon tail gas with low concentration of light hydrocarbon components

Method used

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  • Treating method for discontinuous small-flow light-dydrocarbon-containing tail gas at low light dydrocarbon concentration

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Experimental program
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Effect test

Embodiment 1

[0049] A treatment method for tail gas containing light hydrocarbons with intermittent, small flow rate and low concentration of light hydrocarbon components, which is processed by a process device as shown in Figure 1, and the treatment method specifically includes the following steps:

[0050] (a) The light hydrocarbon-containing tail gas with small flow rate and low light hydrocarbon component concentration discharged from different systems is collected into the buffer of the tail gas collection unit and cooled, wherein the condensate enters the condensate recovery tank, and the first non-condensable gas enters the step ( b) processing procedures;

[0051] (b) Pass the first non-condensable gas into the compression condensing unit for compression, heat exchange, and condensation, the condensate is passed into the condensate recovery tank, and the second non-condensable gas enters the processing procedure of step (c);

[0052] (c) The light hydrocarbon component concentratio...

Embodiment 2

[0068] The tail gas containing light hydrocarbon components and nitrogen (mostly) discharged from each unit is collected into the tail gas collection tank. The tail gas is collected and buffered in the collection tank. Under the condition of natural cooling, a small part of hydrocarbons condenses, and the condensate enters the condensate recovery tank. The preliminary measurement of the concentration of non-condensable gas at the outlet of the buffer tank is 1000g / m 3 .

[0069] The high concentration of hydrocarbon tail gas enters the process of compression and condensation treatment, in which the pressure of compressor 2 is controlled at 0.8MPa to 5.0MPa, and the temperature of the tail gas rises to about 130°C after the two-stage compression treatment of compressor 2. The gas at the outlet of the compressor 2 enters the primary water cooler 4 after heat exchange, and the cooling temperature is -10°C to 5°C to condense part of the hydrocarbons. The condensate and non-conden...

Embodiment 3

[0072] The tail gas containing light hydrocarbon components and nitrogen (mostly) discharged from each unit is collected into the tail gas collection tank. Preliminary measurement of the concentration of hydrocarbon components in the tail gas at the outlet of the buffer tank is 198g / m 3 , directly into the mineral oil absorption treatment process. After mineral oil absorption treatment, the concentration of hydrocarbon components in the tail gas is 3.96g / m 3 . Enter the catalytic oxidation link, after low-temperature catalytic oxidation and high-temperature catalytic oxidation treatment, the emissions meet the standards.

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Abstract

The invention relates to a treating method for a discontinuous small-flow light-dydrocarbon-containing tail gas at low light dydrocarbon concentration. The treating method comprises the following steps: (a) collecting and storing light-dydrocarbon-containing tail gas in a tail gas collecting unit for temporarily storing and cooling; (b) introducing a first non-condensable gas into a compressing condensate unit for compressing, exchanging heat and condensing; (c) testing the light dydrocarbon concentration A1 of a second non-condensable gas discharged from step (b) and selecting the following treating step according to the value of A1; (d) introducing the second non-condensable gas into an oil absorbing treating unit for performing oil absorbing treatment, removing light dydrocarbon and generating a third non-condensable gas; (e) testing the light dydrocarbon concentration A2 of a third non-condensable gas and selecting the following treating step according to the value of A1; (f) introducing the non-condensable gas into a catalytic oxidation unit, catalytically oxidizing, discharging after reaching the standard and introducing all the condensate into a condensate recycling tank. Compared with the prior art, the treating method provided by the invention has the advantages of energy-saving effect, simple equipment, excellent recycling effect of hydrocarbon gas, and the like.

Description

technical field [0001] The invention relates to a tail gas recovery and treatment method, in particular to a light hydrocarbon-containing tail gas treatment method with intermittent, small flow rate and low light hydrocarbon component concentration. Background technique [0002] Many chemical industries use hydrocarbons as raw materials or solvents in the daily production process. Volatile hydrocarbons are inevitably volatilized or emitted during use. If they are discharged directly, they will cause serious air pollution, and the direct discharge of these hydrocarbon gases is a waste of energy. Hydrocarbons with a low concentration of light hydrocarbon components discharged into the atmosphere will react with oxygen to form oxides under the irradiation of ultraviolet light, causing photochemical smog and polluting the atmosphere. And these oxides can also react with other nitrogen oxides or sulfides to promote the generation of acid rain and seriously damage the ecological ...

Claims

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Application Information

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IPC IPC(8): B01D53/14B01D53/86B01D53/72B01D53/00
CPCB01D53/002B01D53/1487B01D53/72B01D53/8668
Inventor 蔡祥军
Owner SHANGHAI LEADER CATALYST
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