System and method for treating coating exhaust and coating equipment provided with system

Abstract

The invention discloses a system and method for treating coating exhaust and coating equipment provided with the system, and relates to the field of treatment of industrial exhaust. The system for treating coating exhaust comprises a demisting device, an adsorption device, a waste heat recovery device, a condensation heat exchange device and a VOCs recovery device. The demisting device, the adsorption device, the waste heat recovery device and the condensation heat exchange device are connected in sequence. The demisting device, the adsorption device and the waste heat recovery device are all connected with the VOCs recovery device. The VOCs recovery device is used for recovering VOCs, recovered by the demisting device, the adsorption device and the condensation heat exchange device, of coating exhaust. The waste heat recovery device is used for exchanging heat with coating exhaust passing through the adsorption device. The condensation heat exchange device is used for conducting condensation heat exchange on coating exhaust passing through the waste heat recovery device. By the adoption of the system and method for treating coating exhaust and the coating equipment provided with the system, production energy consumption and production cost can be effectively reduced under the condition that the production efficiency is not affected; and meanwhile, VOCs are effectively removed, and the requirement for environment protection is met.

Description

technical field [0001] The invention relates to the field of industrial waste gas treatment, in particular to a system and method for treating coating tail gas and coating equipment equipped with the system. Background technique [0002] Coating is to cover metal and non-metal surfaces with protective or decorative layers. The application range of coating technology covers all aspects of life, ranging from household appliances and mobile phones to automobiles, large-scale projects, ships, etc. my country's coating production line equipment It has been developing continuously since the 1970s, especially after the reform and opening up. According to incomplete statistics, there are thousands of coating production lines in my country, and the national investment in this project is as much as several billion yuan each year, resulting in The number of coating production lines continues to grow by hundreds every year. [0003] In today's society, with the rapid development of indus...

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Problems solved by technology

[0003] In today's society, with the rapid development of industrial technology, coating production has also shifted from manual to industrial automation. With the popularization of coating production automation, current coating production mainly includes two parts: spraying and drying. In the process, it is not only necessary to provide sufficient and uniform temperature for the painted product to ensure that the painted film is baked and cured; at the same time, the high-temperature flue gas discharged after drying not only contains a large amount of heat energy, but also contains a large amount of organic volatiles (VOCs), the high-temperature flue gas is directly discharged into the atmosphere or burned, which not only wastes heat energy, but also pollutes the environment

[0004] Since the drying process needs to consume a lot of heat energy and the cost is high, how to effectively reduce the temperature in the coating production and reduce the energy consumption of production has become the most concerned issue in the coating industry at present. The regulations on the content of organic volatiles in the atmosphere are becoming more and more stringent, and the flue gas needs to be treated before being discharged, resulting in rising production costs

[0005] In the face of the country's continuous promotion of high energy consumption and high pollution control, especially in the face of increasingly stringent environmental protection requirements, some companies have begun to treat the exhaust gas of the painting workshop. The current mainstream treatment method is to pass the exhaust gas through a thermal oxidation furnace. Combustion can effectively remove VOCs in the exhaust gas and avoid secondary pollution. However, due to the need to add auxiliary fuel during the combustion of VOCs, the production cost is relatively high

[0006] In order to collect the heat in the flue gas, a heat exchanger is currently installed at the gas outlet of the drying workshop. Since the VOCs in the flue gas are very easy to adhere to the heat exchange pipes, causing blockage of the heat exchange equipment, it is necessary to stop production and clean up. The long-term operation of the equipment will lead to a decrease in production efficiency; at the same time, the long-term accumulation of VOCs in the heat exchanger is prone to deflagration in a high-temperature environment, which is not conducive to the safe operation of the production system

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