What do you know about the four major energy-saving and emission reduction measures in the printing and dyeing industry

1、 Strengthen production management and reduce resource waste

By establishing a reward and punishment system for energy conservation and consumption reduction, strengthening the cultivation of employees' awareness of energy conservation and consumption reduction, involving all staff, and making every effort to reduce steam, electricity, water, and dye consumption. Many enterprises have installed electricity and water meters in their production workshops, implemented a daily report system for dye and chemical consumption, and evaluated and rewarded unit electricity consumption, unit water consumption, and dye and chemical consumption by various departments, mobilizing the enthusiasm of all employees to save energy and reduce consumption.

Applying computer management technology to install online automatic measurement and control systems at key process points on the production line; Equipped with automatic weighing, chemical and distribution systems for additives, colorants and dyes; Equipped with steam automatic control system, fabric moisture automatic measurement and control system, etc., precise control can be achieved according to the process requirements, and the dependence on manual labor can be reduced. It can play a good role in energy conservation, water conservation, and saving dye additives.

2、 Adopting new printing and dyeing technologies and processes to achieve energy conservation and emission reduction

In terms of pre-treatment, new equipment and efficient additives are used to shorten the process flow, reducing water consumption, saving steam and electricity without compromising treatment quality, achieving energy-saving and emission reduction effects. Since the mid-1980s, China's printing and dyeing industry has conducted research on short process pretreatment processes from both the aspects of technology and equipment. Various efficient water washing machines, high feed impregnation machines, combined steaming boxes and other pretreatment equipment provide the equipment foundation for shortening the process. Various new high-efficiency pretreatment additives such as high-efficiency refining agents, non silicon hydrogen peroxide stabilizers, and various pretreatment enzyme preparations make the short process technology mature. At present, the pretreatment technology has undergone revolutionary changes compared to the traditional alkali alkali oxygen process. The one-step pretreatment process of biological enzyme complex and hydrogen peroxide is widely used in the pretreatment process of cotton and its blended fabrics.

The cold rolling pile pretreatment process and cold rolling pile dyeing process technology have developed rapidly in recent years, and the cold rolling pile pretreatment process has been widely used in practical production. The fabric is treated with a pre-treatment solution before immersion and rolling, and then stacked for a certain period of time. It is then subjected to short steaming and efficient water washing to achieve pre-treatment effects such as removing impurities, improving whiteness, and enhancing fabric wool effect. Compared with the conventional three-step pretreatment process, it greatly saves steam consumption and water consumption, and the COD of the pretreatment wastewater is also significantly reduced.

The technology of reactive dye cold rolling batch dyeing has also developed rapidly in recent years due to equipment improvements and dye performance improvements, and has become the mainstream process for corduroy dyeing. Cold rolling batch dyeing is applied to the dyeing of corduroy, which improves production efficiency, enriches the color of the fabric surface, and achieves uniform dyeing without "black air". It cannot be compared with the reactive dye rolling drying rolling steaming method for dyeing corduroy. Other pure cotton fabrics, such as yarn cards and chiffon, have also achieved success in using reactive dyes for cold rolling batch dyeing. This energy-saving and water-saving dyeing process technology still has great potential for promotion and application in China.

The application of other new processes and technologies, such as low alkali pretreatment process, low-temperature dyeing process with reactive dyes, alkaline substitute process with reactive dyes, one bath process for knitted fabric dyeing, and rapid dyeing process with dispersed dyes, can achieve good energy-saving and emission reduction effects.

3、 Do a good job in the secondary utilization of printing and dyeing wastewater, and improve the reuse rate of water

At present, the development of printing and dyeing wastewater treatment technology is rapid. While ensuring the quality of treated water, the goal of joint efforts is to significantly reduce treatment costs. After deep treatment, the water quality of printing and dyeing wastewater can be comparable to tap water, and can be applied in every printing and dyeing process, with a reuse ratio of 50-60%. This technology has become increasingly mature, and there have been multiple successful cases in China.

While emphasizing wastewater treatment, it is also necessary to pay more attention to how to improve the reuse rate of water, how to reduce the amount of printing and dyeing wastewater, how to reduce the amount of pollutants in wastewater, and how to improve the reuse rate of water. Many companies have done effective work in this area, such as using production water as dyeing cooling water first, and recycling some waste heat while reusing it; Install a heat recovery device on the machine that generates hot wastewater to recover and utilize the heat in the wastewater; Adopting advanced steam condensate traps, utilizing pumpless back pressure to recycle hot steam condensate back to boiler rooms or hot water machines; After biochemical and physicochemical treatment, the printing and dyeing wastewater can be used as washing water, medium and dark color dyeing water, etc.

4、 Utilization of residual heat from smoke and dust removal of waste steam from heat setting machine

The direct discharge of high-temperature exhaust gas from the heat setting machine not only causes air pollution but also takes away a large amount of heat energy. The currently developed printing and dyeing exhaust gas treatment system integrates multiple technologies such as exhaust gas spray absorption, oil-water separation, washing water recycling, waste heat utilization, and waste oil collection and utilization, which is another significant contribution to energy conservation and emission reduction. The effective utilization of this device not only achieves the environmental benefits of smoke and dust removal, but also recovers the waste heat and oil in the exhaust gas, achieving a dual effect of environmental protection and cost reduction and efficiency improvement.

In short, with the advancement of technology, the improvement of printing and dyeing processes, the updating of printing and dyeing equipment, and the application of new materials, energy conservation and emission reduction work will gradually deepen and achieve more effective results. At the same time, doing a good job in energy conservation and emission reduction is also an important measure for enterprises to expand their living space, reduce costs and increase efficiency. Only by continuously and effectively doing this work can we promote the healthy and sustainable development of the industry, and enable enterprises to stand firm in the face of the current severe situation and strive for new development.