Two-stage refrigeration liquefier and organic solvent recovery method and system

A secondary refrigeration and organic solvent technology, applied in refrigeration and liquefaction, chemical instruments and methods, refrigerators, etc., can solve the problems of inability to achieve full recovery of organic solvents, inability to realize organic solvent reuse, inability to meet environmental protection policies, etc. Achieve the effects of prolonging cooling time, promoting gas liquefaction, and high cycle efficiency

Pending Publication Date: 2022-05-13
湖南依明机械科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the technical problem that the treatment method based on the adsorption unit cannot realize the full recovery of organic solvents, let alone realize

Method used

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  • Two-stage refrigeration liquefier and organic solvent recovery method and system
  • Two-stage refrigeration liquefier and organic solvent recovery method and system
  • Two-stage refrigeration liquefier and organic solvent recovery method and system

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Embodiment 1

[0080] Adopt above-mentioned a kind of organic solvent recovery method, be used for the treatment of the waste gas containing organic solvent of coating machine or printing factory, comprise the following steps:

[0081] Step S1, installing an axial flow booster fan on the exhaust gas collection pipeline of the coating machine or the printing factory to pressurize the exhaust gas to 0.15MPa;

[0082] Step S2, the pressurized exhaust gas enters the normal temperature water cooling heat exchanger, and the temperature is lowered from 60-80°C to 30-40°C;

[0083] Step S3, further remove the moisture in the waste gas by double-layer drier until the moisture content is 0.02-0.03g / m 3 ;

[0084] Step S4, after drying, the exhaust gas is passed into the regenerator to exchange heat with the exhaust gas of the secondary refrigeration liquefier for pre-cooling, and the temperature drops to 0-5°C;

[0085] Step S5. After precooling, the exhaust gas is sent to the secondary refrigeratio...

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Abstract

The invention relates to a two-stage refrigeration liquefier and an organic solvent recovery method and system.The two-stage refrigeration liquefier comprises a compressor, a condenser, a first-stage evaporator, a second-stage evaporator, a gas-liquid separator, a throttling valve and an ejector, and the first-stage evaporator and the second-stage evaporator are connected in parallel and located between the gas-liquid separator and the ejector; the gas-liquid separator, the compressor, the condenser, the ejector and the first-stage evaporator are sequentially connected to form a first circulation loop, and the gas-liquid separator, the throttling valve, the second-stage evaporator, the ejector and the first-stage evaporator are sequentially connected to form a second circulation loop. According to the main treatment method of the organic solvent recovery method, the secondary refrigeration liquefier with the ejector is adopted to realize the secondary refrigeration temperature. The pretreatment comprises pressurization, water cooling, drying and pre-cooling, the post-treatment comprises condensed liquid dehydration, uncondensed gas adsorption, emission and desorption gas return condensation circulation, full recovery and zero emission are truly realized, and an organic solvent is directly reused after recovery.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment containing organic solvents in related industries such as coating machines and printing presses, and specifically relates to a secondary refrigeration liquefier and an organic solvent recovery method and system. Background technique [0002] At present, industrial production emits a large amount of waste gas containing organic solvents, such as printing and coating machine industries, and the pollution of waste gas emissions containing organic solvents cannot be underestimated. During the coating and printing process, a large amount of organic compounds will be volatilized, such as hydrocarbons, alcohols, esters, ethers, nitriles, etc., and these organic solvents will be discharged in the form of exhaust gas through air entrainment. Due to environmental protection requirements, it is necessary to treat the discharge after reaching the standard. From the perspective of treatment proces...

Claims

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Application Information

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IPC IPC(8): F25B9/06F25B41/40F25B41/20F25B43/00F25B5/02B01D53/02B01D53/00B01D53/26B01D61/00B01D5/00
CPCF25B9/06F25B41/40F25B41/20F25B43/00F25B5/02B01D53/02B01D53/002B01D53/26B01D61/00B01D5/006
Inventor 不公告发明人
Owner 湖南依明机械科技有限公司
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