Benchmark enterprise for VOCs comprehensive management in packaging and printing industry ② Xuchang Yongchang Printing: Actively devote to environmental protection management, work hard and take the lead

In recent years, the environmental protection governance has been strengthened, and the people's awareness of environmental protection has been enhanced. With the guidance, help and promotion of the printing industry association, the VOCs emission and governance in the packaging and printing industry have made great progress.
Xuchang Yongchang Printing Co., Ltd. has always implemented the new development concept, adhered to green development, highlighted the precise, scientific and legal pollution control, vigorously implemented the green transformation of enterprises, strictly controlled the increase of pollutant emissions, effectively reduced the pollutant stock, promoted the transformation and upgrading of enterprises, accelerated the formation of a green development mode, and worked hard to achieve high-quality development of enterprises.

 

 

 

Earnestly implement measures to strengthen the work and make achievements through three approaches
Xuchang Yongchang Printing has always been actively engaged in environmental protection and governance, working hard, taking the lead and bravely standing at the forefront. From the original environmental protection and governance equipment, it has developed to whether the environmental protection equipment is good, the governance effect is good, and the operation is standard and efficient. The continuous optimization of environmental protection management has brought about the reduction of comprehensive energy consumption and the improvement of product quality for Xuchang Yongchang Printing.
Source substitution of raw and auxiliary materials
Xuchang Yongchang Printing Co., Ltd. continuously improved the printing process, increased the use of environment-friendly ink, and actively used environment-friendly ink, low VOCs content fountain solution, car wash water, etc. to control the source. By actively implementing the source substitution of raw and auxiliary materials, the proportion of low VOCs content inks such as water-based inks (VOCs ≤ 15%) and energy curing inks (VOCs ≤ 10%) used in intaglio printing of the company has reached more than 75%; All lithographic printing uses UV energy curing ink for printing, and the proportion of use reaches 100%. The actual VOCs content is 0%~0.8%, which is lower than the national standard (GB 38507-2020) for energy curing ink VOCs content limit (VOCs ≤ 2%); All screen printing uses energy curing ink for printing, and the proportion of use reaches 100%; All printing processes and products of the company have not used solvent based varnish, and the proportion of water based, UV curing (UV) and other non solvent based varnish has reached 100%.
Unorganized emission
Materials involving VOCs are stored in closed containers and in closed raw material rooms.

 

 

A dedicated ink mixing room is set for ink mixing, and the ink mixing room is set as a closed space. The waste gas from the ink mixing room is input to the photo oxygen ion catalytic purification and activated carbon adsorption device through the pipeline. The VOCs waste gas after regeneration and desorption of activated carbon enters the RTO incineration treatment and is discharged after reaching the standard.
Printing is carried out in a fully enclosed workshop, equipped with an efficient organic waste gas collection system. The gravure printing equipment shall be isolated as a whole, and the area around the gravure printing machine shall be separated for full airtight collection to maintain negative pressure; Each group of ovens shall be sealed to maintain negative pressure; The overall exhaust air of the printing machine is collected, and the VOCs waste gas collected is discharged to the RTO for incineration before reaching the standard. The low concentration VOCs waste gas is input to the photo oxygen ion catalytic purification and activated carbon adsorption device, and the VOCs waste gas after regeneration and desorption of activated carbon enters the RTO incineration treatment and is discharged up to the standard.
Selection and treatment of VOCs treatment equipment
On June 7, 2018, Xuchang Yongchang Printing officially launched the VOCs governance equipment transformation project.
First, we went out for investigation. From June 12 to 20, we arranged relevant personnel to go out for investigation and study, which took about 3700 kilometers in seven days. We communicated with five VOCs waste gas treatment enterprises, visited seven VOCs waste gas treatment enterprises and learned about VOCs waste gas treatment technology.
The second is expert demonstration. On July 2, the company invited experts from the Sixth Design and Research Institute of Machinery Industry, Henan Architectural Design and Research Institute, Huangjinye Production and Manufacturing Center, Shanghai Tobacco Packaging and Printing Co., Ltd., Xuchang Environmental Protection Management Department and other units to organize a demonstration meeting of VOCs comprehensive treatment technology scheme, and formulate a proposal that is suitable for the current situation of Yongchang VOCs comprehensive treatment technology scheme with development space.
The third is to standardize procurement. After the project approval of the superior competent department, the company will start public bidding. Based on the principle of selecting the best from the best, the company signed a contract with Wuxi Advancing Technology Co., Ltd. (ATI), the Asian partner of TANN, the world's leading VOCs waste gas treatment brand, and the transformation and upgrading of environmental protection treatment facilities officially entered into the implementation stage.

 

 

Treatment of high concentration VOCs waste gas: First, for VOCs waste gas in gravure printing machine ovens with relatively large air volume and relatively high concentration, LEL air reducing and concentration increasing energy-saving devices are added to each color group of the gravure printing machine, and then the discharged VOCs waste gas is input into RTO (new regenerative oxidation device) for incineration treatment; Second, for the VOCs waste gas at the bottom of the gravure printing machine with relatively low concentration, the method of increasing ground exhaust is adopted for organized collection, and the VOCs waste gas is input into RTO for treatment by incineration; Third, the gravure printing machine should be closed and isolated to achieve effective control of VOCs waste gas. Suggested reference data: after LEL air reduction and enrichment, the air volume of the gravure printing equipment will be reduced to less than 20000 m3/h, including the air volume of the gravure printing machine oven will be reduced to about 12500 m3/h, and the air volume of the ground exhaust fan in the isolation room will be controlled to about 5000 m3/h. (The original air volume of 1 # gravure printing machine is 35000m3/h, and that of 2 # gravure printing machine is 40000m3/h).
Treatment of low concentration VOCs waste gas: for low concentration VOCs waste gas in offset printing machine, silk screen printing machine, single concave machine, gravure printing machine UV printing unit and other equipment, as well as in ink mixing room, chemical warehouse and other places, the method of overall isolation of equipment and increased ventilation of enclosed environment is adopted to realize the organized collection of low concentration gases, and input them to devices such as photo oxygen ion purification and activated carbon adsorption, and then discharge them up to standard after comprehensive treatment.
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Comprehensive governance has been effective, and social and economic benefits have been reaped
For more than two years, Xuchang Yongchang Printing VOCs have been comprehensively managed effectively, benefiting from both social and economic benefits.
Environmental protection facilities are upgraded to guarantee the production and operation of enterprises. After the environmental upgrading and transformation in December 2018, the production and operation of Xuchang Yongchang Printing entered a stable upgrading stage. Since 2019, the company's environmental governance has been highly recognized by the local government management departments.
Reducing wind and increasing concentration brings cost reduction and efficiency increase. After the implementation of wind reduction and concentration increase for the ten color gravure printing unit, the steam energy consumption per 10000 meters of gravure printing products decreased from 4.26 tons/10000 meters in 2017 to 2.38 tons/10000 meters in 2019, a decrease of 44.13%. In 2019, 8861 tons of steam was consumed, 4182 tons less than 13043 tons in 2017. In 2019, the output was 37.2 million meters, an increase of 6.65 million meters or 21.70% compared with 30.65 million meters in 2017. In 2019, the actual steam consumption cost is 1.9051 million yuan. If we refer to the calculation of steam energy consumption in 2017, the steam consumption cost in 2019 will be 3.4071 million yuan, and the steam procurement cost will be reduced by 1.502 million yuan.
Make full use of the subsidy policy. In order to support the development of the manufacturing industry, different special fund policies will be introduced. Yongchang Company has upgraded environmental protection facilities in 2018, and won 890000 yuan of government special funds in 2020.
Make full use of tax policy. According to the Regulations of the People's Republic of China on the Implementation of the Enterprise Income Tax Law, enterprises purchase and actually use the special equipment for environmental protection, energy conservation and water saving, and production safety specified in the Catalogue of Enterprise Income Tax Preferences for Special Equipment for Environmental Protection, Catalogue of Enterprise Income Tax Preferences for Special Equipment for Energy and Water Conservation, and Catalogue of Enterprise Income Tax Preferences for Special Equipment for Work Safety, 10% of the investment amount of the special equipment can be deducted from the tax payable of the enterprise in the current year; If the current year is insufficient for credit, the credit can be carried forward in the next five tax years.
Have the courage to shoulder the social responsibilities that should be fulfilled. As a diversified printing and packaging enterprise in the tobacco industry, Xuchang Yongchang Printing insists on the supremacy of interests and consumers' interests. Through the upgrading and transformation of environmental protection management facilities, it has provided better production and working environment for employees and a better and more secure living and living environment for residents, which has been highly valued and recognized by the local government.
Regarding future VOCs governance, Li Anyong, deputy general manager of Xuchang Yongchang Printing, said that the company will continue to promote VOCs waste gas governance. First, further standardize and improve the system and process, and detail the implementation of environmental protection governance responsibilities; The second is to further strengthen the analysis of online detection. The detection data should be accurate and true, and the reported data should be timely and effective. The detection data should be analyzed regularly and targeted rectification measures should be formulated; The third is to further optimize and improve the on-site management, so that the enterprise's VOCs waste gas treatment work continues to improve.
With regard to the promotion of the standardization of VOCs governance, Li Anyong, Deputy General Manager, suggested that we could further refine and improve the standards, such as online testing, standardizing testing methods, uploading data requirements, etc., so that enterprises can have standards to follow; At the same time, when introducing relevant standards, it is hoped that opinions can be widely solicited so that systems and standards can be implemented easily.
(Source: Printing Industry Magazine)