Analysis of four major energy-saving and emission reduction measures for printing and dyeing enterprises

I. Strengthen production management and reduce waste of resources

 

Through the formulation of a system of rewards and punishments for energy conservation and consumption reduction, we will strengthen the awareness of employees' awareness of energy conservation and consumption reduction, and participate in all efforts to reduce steam consumption, electricity consumption, water consumption and consumption of dyeing materials. Many enterprises install electricity meters and water meters in each production workshop, and implement daily consumption system for dyeing and chemical materials consumption. Each department evaluates the unit's electricity consumption, unit water consumption, and consumption of dyed materials, and mobilizes the enthusiasm of all employees for energy conservation and consumption reduction. 

 

Application of computer management technology, install online automatic measurement and control system at key process points of production line; equipped with automatic weighing, chemical material and distribution system for additives, color paste and dyeing materials; equipped with automatic steam control system, automatic measurement and control of cloth surface moisture The system, etc., achieve precise control according to the process requirements, and reduce the dependence on labor, which can play a very good role in energy saving, water saving, and saving dye additives.

 

Second, the use of printing and dyeing new technology, new technology to achieve energy saving

 

In terms of pre-treatment, the use of new equipment, the use of high-efficiency auxiliaries to shorten the process, without reducing the quality of treatment, reduce water consumption, save steam and electricity, and achieve energy saving and emission reduction. Since the mid-1980s, China's printing and dyeing industry has carried out research on short-process pre-treatment processes from both process and equipment. Various high-efficiency washing machines, high-feeding machine, combined steamer and other pre-treatment equipment provide equipment basis for shortening the process, and various new high-efficiency pretreatment additives such as high-efficiency refining agent, non-silicone hydrogen peroxide stabilizer and various Pretreatment enzyme preparations have made the short process technology mature. At present, the pretreatment technology has undergone a revolutionary change compared with the traditional alkaline alkali oxygen process. The one-step pretreatment process of biological enzyme compound plus hydrogen peroxide is widely used in the pretreatment process of cotton and its blended fabrics. .

 

The cold-rolled pre-treatment process and the cold-rolled pile dyeing process technology have developed rapidly in recent years, and the cold-rolled pile pretreatment process has been widely used in actual production. The fabric is piled up for a certain period of time after being treated with the working solution before padding, and then subjected to short steaming and high-efficiency water washing to achieve pretreatment effects such as removing impurities, improving whiteness, and improving fabric gross effect. Compared with the conventional three-step pretreatment process, steam consumption and water consumption are greatly saved, and the COD of the pretreatment wastewater is also significantly reduced.

 

The dyeing process technology of reactive dye cold-rolled pile has been developed rapidly due to the improvement of equipment and the improvement of dye performance in recent years, and has become the mainstream process of corduroy dyeing. The cold-rolled pile dyeing is applied to the corduroy dyeing, and the production efficiency is improved, the fabric color is full, and the dyeing is uniform without "black gas", which is not comparable to the reactive dye rolling-baking-rolling-steaming dyeing corduroy. Other pure cotton fabrics, such as gauze, crepe, etc., have been successfully dyed by cold-rolled piles of reactive dyes. This energy-saving and water-saving dyeing process technology has a large space for popularization and application in China.

 

Other technologies such as low alkali pretreatment process, reactive dye low temperature dyeing process, reactive dye base agent process, knitted fabric dyeing and one bath process, disperse dye rapid dyeing process, etc. can achieve good energy saving. Emission reduction effect.

 

Third, do a good job in the secondary use of printing and dyeing wastewater, improve the reuse of water

 

At present, the printing and dyeing wastewater treatment technology is developing rapidly, and the treatment cost is minimized while ensuring the treatment of water quality. This is the goal of joint efforts. After the advanced treatment, the dyeing wastewater can be compared with the tap water. It can be applied to every printing and dyeing process, and the recycling ratio is 50-60%. This has become more and more mature in technology, and there have been many successful cases in China.

 

While paying attention to wastewater treatment, of course, more attention needs to be paid 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 increase the reuse rate of water. Many enterprises have done fruitful work in this area, such as: using the production water as the dyeing cooling water first, and recycling some of the waste heat while recycling; adding a heat recovery device to the machine that generates hot waste water, The heat in the waste water is recycled; the advanced steam condensate trap is used, and the hot steam condensed water is reused to the boiler room or the hot water machine by the pumpless back pressure; the printing and dyeing wastewater is subjected to biochemical-physicochemical treatment After that, it is applied to water for washing, water for washing after dark dyeing, and the like.

 

4. Use of smoke and waste heat of waste heat of heat setting machine

 

The direct discharge of high-temperature exhaust gas from heat setting machine not only causes air pollution but also takes a lot of heat energy. The dyeing and exhaust gas treatment system developed at present has collected exhaust gas spray absorption, oil-water separation, washing water recycling, waste heat utilization, waste oil collection and utilization. A number of technologies are another major contribution to energy conservation and emission reduction. The effective use of the device not only achieves the environmental benefits of eliminating smoke and dust, but also recovers the waste heat and waste gas in the exhaust gas, achieving the dual effects of environmental protection, cost reduction and efficiency enhancement.

 

In short, with the advancement of science and technology, the improvement of printing and dyeing process, the updating of printing and dyeing equipment and the application of new materials, the energy conservation and emission reduction work will be gradually deepened, and more effective results will be achieved. At the same time, energy conservation and emission reduction will also be an opportunity for enterprises to expand their living space. The important measures to reduce costs and increase efficiency are only to continue to do this work steadily, in order to promote the healthy and sustainable development of the industry, in order to stand firm in the face of the current grim situation, and strive for new developments. .

 

Transfer from the global textile network