A vocs recovery system and method integrating absorption, desorption and recovery

Abstract

The invention discloses a VOCs recovery system and method that integrates absorption, desorption and recovery. The recovery system includes a water washing unit: connected to a self-coupling pre-cooling unit, used to wash VOCs intake air; a self-coupling pre-cooling unit: connected to To the low-temperature absorption unit, used to condense the VOCs gas after washing; the low-temperature absorption unit: connected to the high-temperature desorption unit through the second heat exchanger, used to absorb the condensed VOCs gas; the high-temperature desorption unit: through the heat exchanger 3. Connected to the low-temperature recovery unit for desorption of VOCs gas after low-temperature absorption; low-temperature recovery unit: connected to the low-temperature absorption unit for recovery of liquefied VOCs, and retransmitting unliquefied VOCs to the low-temperature absorption unit for processing . The recovery system of the invention not only has high energy saving, but also realizes the recycling of the absorption liquid.

Description

technical field [0001] The invention belongs to the field of VOCs recovery and treatment, and in particular 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 (volatileorganic compounds), often appears. In addition to carbon and hydrogen, its molecular structure also contains oxygen, nitrogen, sulfur, and chlorine. Society and enterprises have brought many serious hazards. For example, when a large number of VOCs are evaporatively discharged, they float and gather on the surface space due to their high density, which not only easily causes fire and explosion hazards, but also stimulates the human respiratory tract, causing cancer and other hazards. In addition, it is also a The main reactants produced by photochemical smog cause serious harm to ecology and the environment. my country has limited oi...

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

Images