Benzene organic vapor recycling device and benzene organic vapor recycling method

Abstract

The invention discloses a benzene organic vapor recycling device and a benzene organic vapor recycling method. The benzene organic vapor recycling device comprises a low-temperature condensing device, a variable-temperature adsorbing device and a variable-pressure adsorbing device, wherein the low-temperature condensing device comprises a cold-box heat exchanger, a refrigerating compressor and a condensing heat exchanger which are sequentially connected; a vapor inlet of the cold-box heat exchanger is connected with a benzene organic vapor outlet; the condensing heat exchanger is connected with the cold-box heat exchanger through a valve to form a cooling circulating system; the condensing heat exchanger is further provided with a cooling water inlet and a cooling water outlet to form a water circulating system; the cold-box heat exchanger is further provided with a liquid outlet; the liquid outlet of the cold-box heat exchanger is connected with a layering trough and is used for recycling benzene liquid. The benzene organic vapor recycling device recycles and purifies benzene vapor through the low-temperature condensing device, the variable-temperature adsorbing device and the variable-pressure adsorbing device; finally, the benzene organic vapor achieves a concentration lower than 12 mg / m<3> and completely reaches the discharge standard; no secondary pollution is generated during operation of the benzene organic vapor recycling device.

Description

technical field [0001] The present invention relates to a recovery device for organic vapors of benzene (benzene, toluene, xylene, etc.), in particular to a three-stage recovery device for organic vapors of benzenes. Background technique [0002] Energy and the environment are the themes of the development of the world today and the problems that our country must face. With the enhancement of environmental awareness and the requirement of sustainable development, the recovery of benzene organic vapor will receive more and more attention. The volatilization of benzene organic vapor exists in the production, loading and unloading, storage, canning and other links of the petrochemical industry, such as refineries, coking plants, benzene storage and other places. [0003] Since benzene series and other hydrocarbons are very easy to volatilize in the process of production, storage, transportation, sales, use, etc., resulting in very serious fixed emission sources of benzene orga...

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Problems solved by technology

[0003] Since benzene series and other hydrocarbons are very easy to volatilize in the process of production, storage, transportation, sales, use, etc., resulting in very serious fixed emission sources of benzene organic vapors, which not only cause resource loss, but also constitute a potential fire hazard. At the same time, toxic benzene organic vapors seriously pollute the environment and endanger the health of employees

[0004] According to the investigation, the name is "a two-stage benzene organic vapor recovery device and its recovery method", the patent number is ZL201120415119.7, a two-stage benzene organic vapor recovery device and its recovery method using a combination of condensation treatment and temperature swing adsorption, It solves the recovery of benzene organic vapor to a large extent, but there is still a certain difference with the national milligram-level emission indicators

[0005] So far, there is no mature device on the market that can meet the requirements of large-scale petrochemical plants and coking plants, benzene storage and benzene transfer warehouses and other places where benzene vapor is volatile and discharged.

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