The hottest implementation of three emission reduc

2022-08-12
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Implement three major emission reduction measures to easily deal with VOCs emission standards

release date: Source: Internet editor: lychee Views: 907 copyright and disclaimer

core tip: at the just concluded printing enterprise pollutant control and governance Technology Forum, he Xiaochu, senior engineer of Shanghai Academy of Environmental Sciences, made a wonderful speech on the topic of "interpretation of air pollutant emission standards and control policies of printing industry", Part of the speech is summarized as follows, providing reference and reference for printing enterprises to significantly reduce VOCs emissions And C company, an American wire and cable manufacturer, has developed a road test for extruded transmission lines made of thermoplastic composites

[China Packaging News] at the recently concluded printing enterprise pollutant control and treatment technology forum, he Xiaochu, a senior engineer of Shanghai Academy of Environmental Sciences, made a wonderful speech on the topic of "interpretation of air pollutant emission standards and control policies in the printing industry". Some of the speech contents are summarized as follows, providing reference and reference for printing enterprises to significantly reduce VOCs emissions

what is VOCs

organic compounds participating in atmospheric photochemical reactions, or organic compounds determined by measurement or accounting according to the specified methods

common VOCs: benzene homologues, petroleum hydrocarbons, organic chlorides, freon series, organic ketones, amines, alcohols, ethers, esters, acids, etc. (common in the printing industry: esters, alcohols, ketones, benzene, etc.)

current situation of the printing industry

VOCs emission sources in the printing industry are mainly the use of solvent based inks, fountain solutions, adhesives, coating fluids, varnish, car washing water; VOCs emission nodes in the printing industry are mainly in printing, compounding, coating, glazing and drying processes; Printing enterprises mainly use offset printing, followed by gravure printing. At present, gravure printing mostly uses solvent based ink, which is the main source of VOCs emissions in the printing industry; At present, the management level of printing enterprises varies greatly, and there are few effective end treatment facilities; The capture efficiency of the printing process in typical printing enterprises is only% lower, but the NMHC emission concentration can reach 600 mg/m3, and the NMHC concentration at the emission outlet of typical composite and coating processes can reach 3500 mg/m3

emission reduction measures

1. Green raw and auxiliary materials

raw and auxiliary materials with low/no VOCs content are used to replace raw and auxiliary materials with high VOCs content

2. Cleaner production process

process control: optimize process arrangement, reduce downtime and frequent printing changes

ink supply: the central ink supply system is adopted

printing method: flat offset printing with oily current ink and UV ink, flexo printing with water-based ink and UV ink instead of gravure printing and flexo printing with solvent based ink

compounding: solvent free compounding is used instead of solvent compounding

3. Production management

inking: set up a special inking room. When secondary inking is required in the process of ink use, use a mobile suction hood

printing: effective collection of printing and drying exhaust; The ink tank and ink supply system are sealed in the normal production process; Reduce the amount of trial printing and waste products

car washing: wipe car washing is adopted, and many of them are non-standard products. Automatic car washing is required, and a special car washing room needs to be set up for rinsing

composite: composite and drying exhaust air are effectively collected; The adhesive coating tank is closed for ventilation

record account: the polluting unit records the name of raw materials containing VOCs and VOCs content used every month. 7. Diameter of sample holder: ф 50mm ф 60mm ф 89mm, purchase volume, usage, inventory, etc

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