Absorption, desorption and recovery integrated VOCs recovery system and absorption, desorption and recovery integrated VOCs recovery method

Abstract

The invention discloses an absorption, desorption and recovery integrated VOCs recovery system and an absorption, desorption and recovery integrated VOCs recovery method. The recovery system comprises: a water washing unit connected with a self-coupling pre-cooling unit and used for carrying out water washing on VOCs inlet gas; the self-coupling pre-cooling unit connected to a low-temperature absorption unit and used for condensing the washed VOCs gas; the low-temperature absorption unit connected to a high-temperature desorption unit through a heat exchanger II and used for absorbing the condensed VOCs gas; the high-temperature desorption unit connected to a low-temperature recovery unit through a heat exchanger III and used for desorbing the VOCs gas subjected to low-temperature absorption; and the low-temperature recovery unit connected to the low-temperature absorption unit and used for recovering the liquefied VOCs and conveying the non-liquefied VOCs to the low-temperature absorption unit again so as to be treated. The recovery system disclosed by the invention is highly energy-saving, and realizes cyclic utilization of the absorption liquid.

Description

Technical field [0001] The invention belongs to the field of VOCs recovery treatment, and specifically relates to a VOCs recovery system and method integrating absorption, desorption and recovery. Background technique [0002] In various industrial production and related processes, a kind of volatile organic compounds, namely VOCs (volatile organic compounds), often appear, whose molecular structure contains oxygen, nitrogen, sulfur, and chlorine in addition to carbon and hydrogen. Society and enterprises have brought many serious hazards. For example, when a large amount of VOCs evaporate and discharge, they will not only easily cause fire and explosion hazards due to high density, but also irritate the human respiratory tract and cause cancer and other hazards. In addition, it is still The main reactants produced by photochemical smog cause serious harm to ecology and the environment. my country's oil resources are limited, and it is also a big oil consumer and importer, so VO...

AI Technical Summary

Problems solved by technology

The current recovery method mainly adopts a single recovery method, including adsorption method, absorption method, condensation method and membrane method, but in actual operation, the single use of these methods will cause a series of problems, and the recovery efficiency is low

For example, the absorption method has high requirements on the performance of the absorbent, the consumption of the absorbent is large, and the equipment occupies a large space, resulting in a low process recovery rate; in practical applications, the adsorption method often uses an adsorbent with relatively good adsorption performance and moderate price, such as Activated carbon, but the adsorption heat of activated carbon is high, and the adsorption temperature rises rapidly, which leads to the reduction of adsorption performance and service life, and also increases the safety hazards such as fire and explosion; the condensation method has high temperature requirements and needs to condense the gas at an extremely low temperature In order to achieve the ideal condensation effect, it has high requirements for materials and processes, and the recovery and operation costs are relatively high; membrane oil and gas recovery is a modern oil and gas separation technology that emerged in the late last century, and the separation is achieved by different molecular sizes. It occupies a small area, operates safely, and is easy to maintain, but it usually needs to be combined with other processes to achieve good separation efficiency

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