Collecting system for printing and coating waste gas

Abstract

The invention relates to a collecting system for printing and coating waste gas. The collecting system comprises a fresh air intake system, a hot air drying system, a printing machine and a tail gas treatment system which are sequentially connected, wherein the tail gas treatment system is connected with the hot air drying system through a heat energy recycling system; the fresh air sucked by thefresh air intake system is sent into the printing machine via the hot air drying system, and carries the waste gas in the printing machine out of the tail gas treatment system; the high-temperature waste gas treated by the tail gas treatment system is performed with heat exchange by the heat energy recycling system, and the gas after heat exchange is exhausted out; the heat absorbed by the heat energy recycling device is recycled into the hot air drying system. The collecting system has the advantages that part or all of heat energy can be recycled by the heat energy recycling system; the hotair is directly recycled to a circulating drying air inlet of the printing machine by the hot air recycling system, so as to greatly reduce the air volume and fully recycle the heat energy; the running cost of tail gas treatment is greatly reduced, a large amount of heat energy is saved, and the higher social and economic benefits are realized.

Description

technical field [0001] The invention relates to the field of VOCs waste gas treatment, in particular to a collection system for printing and coating waste gas. Background technique [0002] VOCs are a class of volatile organic compounds with a boiling point lower than 250°C, which are very harmful to human health and the ecological environment. Effective treatment of this type of organic waste gas can not only avoid environmental pollution, but also reduce the operating costs of enterprises, and have high social and economic benefits. [0003] In the printing industry, a large amount of VOCS-containing exhaust gas is also emitted, especially in the color printing process. Due to the need for overprinting, that is, after printing one color, it needs to be dried quickly in order to print the next color. In the existing printing presses, the surrounding air is generally directly extracted, heated and then entered into the drying box of the printing press, and then discharged. ...

AI Technical Summary

Problems solved by technology

In recent years, some of the newly manufactured and installed printing machines have carried out simple internal circulation and partially recycled the heat. However, due to the large air volume, the energy consumption during heating is huge, and the air volume is large. The treatment used for exhaust gas treatment The scale of the equipment is large, and the operating cost is also high

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