Low-carbon economy has brought new opportunities for China's leap-forward development. For China's carbon industry, the rise of a low-carbon economy not only shows good opportunities for development but also foreshadows new challenges. The carbon industry focuses on two aspects in the development of a low-carbon economy: First, it researches and produces carbon products that meet the needs of renewable energy and clean energy production; second, it does a good job of energy-saving and emission reduction in the carbon industry's own production process.
Carbon fiber and its products have excellent performance, light weight, high strength, corrosion resistance, used in the production of automobiles can greatly reduce the quality, save fuel, reduce emissions, large rotors used to produce wind turbines lightweight and strong, with The reinforcement of the building structure is convenient and reliable, and these areas have a very broad market space for themselves. It can be foreseen that the carbon industry will have a great deal in these areas. In addition, the traditional users of the carbon industry, the solar photovoltaic industry, have developed rapidly. Recently, the central government has earmarked a budget of 1.27 billion yuan to launch the “Solar Roof Project†and has included 111 of the first national photovoltaic building demonstration projects with a total size of 91 megawatts. Annual demand for special graphite materials is about 30,000 tons.
All kinds of carbon products mentioned above can be produced in most of our country at present, but the performance and quantity of products cannot meet the market demand. Therefore, China's carbon industry should increase investment in R&D, improve technological innovation capabilities, and strive to produce high-quality carbon products needed for low-carbon economy.
In addition, carbon industry also has a lot of energy-saving emission reduction space in its own production process. Although carbon products are not high energy-consuming products, the total energy consumption per ton of finished products of ordinary carbon electrodes is about 0.8 to 1.05 tons of standard coal. However, due to the high scrap rate, the industry level is higher than the average energy consumption of foreign advanced carbon companies. 10% to 20%.
In order to reduce the scrap rate and increase the yield, carbon companies should purchase qualified raw materials with stable quality and try their best to stabilize the raw material supply base. In particular, the choice of binder coal tar is very important. The production of graphite electrodes and carbon products for aluminum use modified asphalt is a general trend. The transition from the use of ordinary medium temperature asphalt to the use of modified asphalt as soon as possible is conducive to improving product quality and yield. When the foreign carbon plant produces graphite electrodes, the modified asphalt is used as a binder and the roasting process is optimized. The yield of primary roasting is 1% to 2% higher than that of the Chinese counterparts. In particular, roasting and impregnation processes basically produce no waste, and graphitization and Processing also rarely produces cracks.
In addition, carbon companies should also carry out technological innovations and technological transformations of equipment in due course. The upgrading and transformation of processes and equipment must be technically demonstrated and compared with plans, so that investment is low and the efficiency is high. For example, the production of high-power or ultra-high-power graphite electrodes should promote short-process production. Less one-time impregnation and less one-time roasting can greatly reduce energy consumption. The energy consumption per ton of ultra-high-power graphite electrodes can be reduced to about 0.2 tons or more of standard coal. The use of modified bitumen as a binder and impregnated bitumen with a low quinoline insoluble content as impregnating agent can also shorten the production process; graphite electrode production can reduce the maximum temperature of primary and secondary calcinations; graphitization uses internally heated tandem graphite Compared with DC's Acheson graphitization process, the power saving technology generally achieves 20% to 25%, and eliminates the electrical resistance material (approximately 300 kg of metallurgical coke per ton of finished electrode); carbon companies can also To enhance the utilization of waste heat, the carbon plant has three major furnaces: calciner, roaster and graphitization furnace, and there is ample potential for waste heat utilization. The application of these new process technologies has significant effects on the energy conservation and emission reduction of the carbon industry. If China's carbon industry through three years of efforts to reduce the overall energy consumption per unit of product 5%, can reduce carbon dioxide emissions by about 2 million tons per year.
It can be said that the development of a low-carbon economy is an important strategic opportunity for China's carbon industry to accelerate structural adjustment, actively adapt to the market, and achieve industrial upgrading. Chinese carbon companies and their colleagues in the industry should seize this opportunity to make the industry enter a healthy and orderly development track and work tirelessly for the sustained, stable and coordinated development of the carbon industry.
Carbon fiber and its products have excellent performance, light weight, high strength, corrosion resistance, used in the production of automobiles can greatly reduce the quality, save fuel, reduce emissions, large rotors used to produce wind turbines lightweight and strong, with The reinforcement of the building structure is convenient and reliable, and these areas have a very broad market space for themselves. It can be foreseen that the carbon industry will have a great deal in these areas. In addition, the traditional users of the carbon industry, the solar photovoltaic industry, have developed rapidly. Recently, the central government has earmarked a budget of 1.27 billion yuan to launch the “Solar Roof Project†and has included 111 of the first national photovoltaic building demonstration projects with a total size of 91 megawatts. Annual demand for special graphite materials is about 30,000 tons.
All kinds of carbon products mentioned above can be produced in most of our country at present, but the performance and quantity of products cannot meet the market demand. Therefore, China's carbon industry should increase investment in R&D, improve technological innovation capabilities, and strive to produce high-quality carbon products needed for low-carbon economy.
In addition, carbon industry also has a lot of energy-saving emission reduction space in its own production process. Although carbon products are not high energy-consuming products, the total energy consumption per ton of finished products of ordinary carbon electrodes is about 0.8 to 1.05 tons of standard coal. However, due to the high scrap rate, the industry level is higher than the average energy consumption of foreign advanced carbon companies. 10% to 20%.
In order to reduce the scrap rate and increase the yield, carbon companies should purchase qualified raw materials with stable quality and try their best to stabilize the raw material supply base. In particular, the choice of binder coal tar is very important. The production of graphite electrodes and carbon products for aluminum use modified asphalt is a general trend. The transition from the use of ordinary medium temperature asphalt to the use of modified asphalt as soon as possible is conducive to improving product quality and yield. When the foreign carbon plant produces graphite electrodes, the modified asphalt is used as a binder and the roasting process is optimized. The yield of primary roasting is 1% to 2% higher than that of the Chinese counterparts. In particular, roasting and impregnation processes basically produce no waste, and graphitization and Processing also rarely produces cracks.
In addition, carbon companies should also carry out technological innovations and technological transformations of equipment in due course. The upgrading and transformation of processes and equipment must be technically demonstrated and compared with plans, so that investment is low and the efficiency is high. For example, the production of high-power or ultra-high-power graphite electrodes should promote short-process production. Less one-time impregnation and less one-time roasting can greatly reduce energy consumption. The energy consumption per ton of ultra-high-power graphite electrodes can be reduced to about 0.2 tons or more of standard coal. The use of modified bitumen as a binder and impregnated bitumen with a low quinoline insoluble content as impregnating agent can also shorten the production process; graphite electrode production can reduce the maximum temperature of primary and secondary calcinations; graphitization uses internally heated tandem graphite Compared with DC's Acheson graphitization process, the power saving technology generally achieves 20% to 25%, and eliminates the electrical resistance material (approximately 300 kg of metallurgical coke per ton of finished electrode); carbon companies can also To enhance the utilization of waste heat, the carbon plant has three major furnaces: calciner, roaster and graphitization furnace, and there is ample potential for waste heat utilization. The application of these new process technologies has significant effects on the energy conservation and emission reduction of the carbon industry. If China's carbon industry through three years of efforts to reduce the overall energy consumption per unit of product 5%, can reduce carbon dioxide emissions by about 2 million tons per year.
It can be said that the development of a low-carbon economy is an important strategic opportunity for China's carbon industry to accelerate structural adjustment, actively adapt to the market, and achieve industrial upgrading. Chinese carbon companies and their colleagues in the industry should seize this opportunity to make the industry enter a healthy and orderly development track and work tirelessly for the sustained, stable and coordinated development of the carbon industry.
U tube heat exchanger is suitable for the large temperature difference between tube side and shell side. The shell side media is easy to scale and needs cleaning, while the tube side media is clean and not easy to scale. It is also suitable for high temperature, high pressure, fluid corrosive working conditions.
Each heat exchange tube is bent into U-shape, the two ends are fixed in the upper and lower areas of the same Tube Sheet, and divided into two chambers of inlet and outlet with the partition in the tube box. This kind of heat exchanger completely eliminates the thermal stress, the structure is simpler than the floating type, but the tube side is not easy to clean.
The number of tubes is small, the utilization of the tube sheet is not frequent, and the shell side fluid is easy to short circuiting, which is unfavorable to heat transfer. If there is a leak or damage in the tube, the external U-tube can be replaced, while the broken inner tube can not be replaced, only plugged, and one broken U-tube means two broken, so the U-tube easily scrapped.
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Guangdong Jiema Energy Saving Technology Co.,Ltd , https://www.heatexchangerjm.com