Method and device for purifying organic waste gas and utilizing residual heat in printing ink workshop

Abstract

The invention discloses a method and device for purifying organic waste gas and utilizing residual heat in a printing ink workshop. The method is characterized by using an adsorption rotating wheel to adsorb organic components in the large-air volume low-concentration waste gas onto an adsorption zone, evacuating the purified waste gas, carrying out desorption on the organic components on the adsorption rotating wheel adsorption zone by desorption gas, letting the desorbed waste gas containing high-concentration organic components enter a regenerative burner for high temperature oxidation treatment, simultaneously, cooling the desorbted adsorption rotating wheel by low-concentration waste gas and letting the cooled adsorption rotating wheel enter the next adsorption cycle; wherein the partial heat generated by the high temperature oxidation treatment of the waste gas can be used for preheating the desorption gas through a first heat transfer unit, and the excess heat can be used for heating fresh air or softened water through a second heat transfer unit. According to the invention, the adsorption-desorption mode is utilized to converse the large-air volume low-concentration waste gas generated in the printing ink workshop into the high-concentration small-air volume waste gas, and then the waste gas is thoroughly purified by high temperature oxidation, thus the purification efficiency is high, the energy consumption is low, and the heat utilization rate is high.

Description

technical field [0001] The invention relates to the technical field of organic waste gas purification, in particular to a method and device for the purification of organic waste gas in an ink workshop, which combines high-temperature oxidation and heat recovery for purification and waste heat utilization. Background technique [0002] In printing, coating and other industries, printing inks and glues contain a large amount of organic solvents, of various types, and most of them are harmful, such as toluene, xylene, ethyl acetate, acetone, isopropanol, etc. After the printing and coating process is completed, the paper or coating is conveyed to the drying box, and the hot air is sent to the drying box by the blower for drying. During the drying process, the organic solvent is heated by hot air, and volatilizes from the paper or coated surface into the gas phase, generating a large amount of organic waste gas. This kind of exhaust gas is not only harmful to the health of prod...

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Problems solved by technology

[0003] At present, there are several methods for the treatment of organic waste gas: the first is direct discharge, which not only wastes a lot of organic solvents, but also causes serious environmental problems; the second is the use of activated carbon fibers for adsorption and recovery, which can be recycled Some solvents, but because the concentration of exhaust gas in the printing and coating industry is generally low, the economic benefits are not high, and water vapor is needed for desorption, which consumes a lot of energy; the third is to use catalytic oxidation or high-temperature oxidation to treat VOCs components Carry out destruction to achieve the purpose of purification. This method has high purification efficiency, but due to the characteristics of large air volume and low concentration in the printing industry, it generally cannot maintain self-heating operation, and the power equipment such as fans required for waste gas transportation consumes a lot of energy

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