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"Metal filter bags will be a new technology, compared to the traditional filter bag performance will be superior." It can be directly used to purify high temperature flue gas, and the purified high temperature flue gas can directly enter the SCR(selective catalytic reduction) denitrification link, eliminating the heating energy consumption of the conventional filter bag, and realizing the integration of desulfurization and denitrification." At the recently held Chinese Academy of Engineering strategic research and consulting project "Textile industry pollution reduction carbon synergies implementation path research", Li Guimei, president of the China Industrial Textile Industry Association (hereinafter referred to as the "Middle Class Association"), pointed out that the industrial chain upstream and downstream pollution reduction carbon synergies, is an important way for the green development of the industrial textile industry.
Green development is the basis of high-quality development, and the new quality productivity itself is green productivity. Nonwovens are the main components of the industrial textile industry in China. Reducing the energy consumption of the three major production processes of nonwovens, including needling, spunling and spunbonding, is the basis for the green development of the industrial textile industry. From the perspective of industry characteristics, the whole industrial chain to reduce pollution and carbon synergies, improve the construction of the standard system, is the direction of green development of the industry.
Production energy saving and consumption reduction is the foundation
China's industrial textile industry has developed rapidly in recent years, with an average annual growth rate of 8.6%. In 2022, China's industrial textile fiber processing capacity reached 19.6 million tons, of which nonwovens occupy an important proportion in industrial textiles, and its output reached 8.13 million tons. It is a topic that must be studied deeply in the green development of the industry to do a good job in the energy saving and consumption reduction of the three major production processes of nonwovens: needling, spunlace and spunbond.
In order to consolidate the basic research work of energy conservation and consumption reduction in the industry, the Middle Class Association undertook the carbon reduction research in the field of spunlaced, needled and spunbonded nonwovens of the industrial textile industry in the consulting project of the Chinese Academy of Engineering's "Dual-carbon Development Strategy and Technology Roadmap for Textile Industry". The research group visited and investigated key enterprises, established analytical models, accurately measured the carbon emission level of the industry, and sorted out industry-related low-carbon technologies.
In the production of spunlaced nonwovens, the intelligent low-carbon transformation technology of the whole process can be used to monitor, analyze, control and optimize the energy consumption and raw material consumption of water, electricity, gas and heat in the production process, so as to realize the fine management of energy consumption and achieve the effect of energy saving and consumption reduction. By promoting high-efficiency and energy-saving spunling equipment, using simulation technology to study the fluid dynamics in the working process of spunling, establishing the corresponding relationship between different pressure of water spunling head, suction roller configuration and different products, setting up rationalization process and making full use of resources and energy, the comprehensive energy efficiency can be reduced by 15%. Promote and apply the control device for efficient recovery and utilization of hot and humid gas, increase the temperature of fresh air through heat exchanger heating and drying system, reduce natural gas consumption, and reduce energy consumption per unit product by about 5%.
In the production of spunbond nonwovens, the high speed and high yield spunbond production technology and equipment can improve the production speed and productivity of single thread. The higher the production efficiency of spunbonded nonwovens, the lower the energy consumption per unit product. At present, the production speed of the new generation of spunbond production line can reach 600-800 meters/minute, and the unit energy consumption can be reduced by 15%-25%. In the process, the melt direct spinning technology can reduce the unit energy consumption of spunbond nonwovens by 10%-15%, while greatly reducing transportation costs and carbon emissions.
In the production of needling nonwovens, the energy consumption of needling machine can be reduced by 7% by realizing the lightweight of mechanical parts of needling equipment. Using light load, low damage, energy saving needle consolidation technology, can effectively improve the needle hook tooth holding ability, reduce the load of the needle machine, enhance the fiber displacement and entanglement effect, production efficiency can be increased by 14%, energy consumption per unit product reduced by 8%. The multi-needle plate acupuncture reinforcement technology can achieve a higher efficiency of fiber mesh reinforcement in one needle machine, which is more than 30% more efficient than the traditional single needle plate acupuncture machine, and the energy consumption per unit product is reduced by 15%. Promotion of efficient carding needle production line, the use of "double comb double shop" configuration instead of the current "one comb and one shop" based needle production line, can improve the utilization rate of needle machine, improve the production line speed, unit product energy consumption can be reduced by 15%-25%.
Li Guimei said that the Middle Class Association actively explored new models and new paths for the green innovation and development of the nonwoven industry, and led the establishment of the Green Development and Innovation Alliance for the nonwoven industry of the Middle Class Association (hereinafter referred to as the "non-woven Green Alliance"); Participated in the research of "Textile Industry Dual Carbon Development Strategy and Technology Roadmap" of the Chinese Academy of Engineering; Establish a green standard system for spunlaced, needled, spunbonded nonwovens and other fields, and formulate and revise more than 10 related standards; To carry out industrial green factory cultivation and other work, a total of 15 enterprises have been rated as industrial green factories.
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