Device and method for washing, purifying and recovering organic waste gas by wet process

Abstract

The invention provides a device and a method for washing, purifying and recovering organic waste gas by a wet process. The device comprises an evaporation concentration layer, an absorption layer, a washing liquid spraying device, a demisting layer and a recovering tank. By utilizing the absorption layer, the waste gas reaches a saturation state or supersaturation state, so that washing liquid steam is condensed and condensation nucleus grows to absorb organic matters in the waste gas; and by further utilizing the evaporation concentration layer, the washing water exchanges heat with the organic waste gas and the organic waste gas is evaporated and concentrated, so the organic waste gas is purified and an organic solvent therein is recovered; therefore, the device can effectively wash and purify the organic waste gas by the wet process. The invention also provides a method for washing, purifying and recovering organic waste gas by a wet process.

Description

technical field [0001] The present invention provides a device and method for wet scrubbing, purification and recovery of organic waste gas, more specifically, a device and method for purifying organic waste gas by wet scrubbing and recovering organic solvents at the same time. Background technique [0002] Organic solvents are widely used in daily life and factory production products, and organic solvents are easy to volatilize into gases at room temperature, so they are also called volatile organic compounds (Volatile Organic Compounds, VOCs), and most VOCs have certain effects on the human body. Toxic, must be recycled to reduce harm to the human body; and the organic solvents used in different industries are also different, such as PU (polyurethane, polyurethane) production industry, technology manufacturing industry and lithium battery manufacturing industry, etc. Industry, the various organic solvents mainly used, and their related properties are listed in the followin...

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Problems solved by technology

[0007] Therefore, due to the traditional condensation recovery method, it is necessary to use refrigeration equipment to control the operating temperature at a relatively low temperature and a long enough residence time to remove VOCs through the condensation mechanism and ensure that the concentration of VOCs contained in the treated exhaust gas reaches the lowest; however, If such a traditional condensation recovery method is applied to an industry with a considerable amount of emissions and a VOCs concentration of only tens to hundreds of PPMv (<<1,000ppmv), in order to achieve high condensation efficiency, it needs to be reduced to an extremely low temperature (at least below zero 20℃), the energy consumption and equipment maintenance cost will be quite high; therefore, many operators often face the problem of poor recovery efficiency of condensing equipment based on the limitations of traditional condensing system design and the consideration of saving operating costs

[0008] On the other hand, there is currently no better and economical method and device for fine mist or particles of sub-micron order. (removal of about 50% efficiency), the required pressure drop needs to be as high as nearly 35 inches of water column, and the liquid-gas ratio is about 2.0 liters / m3, so its disadvantage is that the removal efficiency is limited, and its operating cost is also quite height of

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