Discussion on the subversive high-efficiency and energy-saving heating furnace to help "carbon neutralization"

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Carbon dioxide is an important emission in the process of global energy production, industrial manufacturing, transportation and residents' life. Since the industrial revolution, the concentration of carbon dioxide in the atmosphere has increased by nearly 50% (280ppm to 415ppm), which has also brought a series of problems such as the rise of global average temperature and abnormal ecological climate. As the world's largest carbon emitter, China has the responsibility and obligation to bring the control of carbon dioxide emissions into the overall national strategic decision-making. Only then can carbon dioxide emissions reach the peak by 2030 and strive to achieve the goal of carbon neutralization by 2060.

At present, China's industrial structure dominated by heavy chemical industry, energy structure dominated by coal and transportation structure dominated by road transportation still maintain structural, root and trend pressure on ecological and environmental protection. The direct means to change the current industrial structure, energy structure and transportation structure is to resolutely curb the blind development of "two high" projects and rationally guide the green and low-carbon upgrading of industries / industries. To this end, the guidance on strengthening the prevention and control of ecological environment sources of high energy consumption and high emission construction projects issued by the Ministry of ecological environment on May 30, 2021 mentioned that it is necessary to "strictly examine and approve the EIA of 'two high' projects". This will have a transformative and far-reaching impact on the very important metal processing industry in the national economy.

Construction, manufacturing and transportation are closely related to each other. The construction industry needs a lot of steel, non-ferrous metals, cement, glass and so on, as well as transportation energy consumption. Mining and beneficiation, nonferrous and ferrous metal smelting and rolling processing are manufacturing industries with high energy consumption, including crude steel, electrolytic aluminum, nickel pig iron, copper, lead-zinc, cement and other industries that use a lot of coal power and coke production. The high energy consuming industries mentioned above are facing the pressure of production reduction or production bottleneck. Recently, Inner Mongolia's "several safeguard measures for ensuring the completion of the dual control task of energy consumption in the 14th five year plan" policy was released, resulting in that Inner Mongolia will no longer approve new electrolytic aluminum production capacity from 2021, and copper, lead and zinc mining enterprises and electrolytic zinc smelters are required that the energy consumption level in that year shall not exceed the energy consumption level in the same period of the past year, which means that the road of capacity and output expansion has been stalled.

The reporter noted that in this wave of carbon neutralization, metal processing enterprises are increasingly adopting new technologies, processes and equipment with energy conservation and environmental protection, including electromagnetic induction heating. Electromagnetic induction heating is a major change in the direct heating mode following the thermal heating generated by the combustion of wood, liquefied gas, natural gas and diesel and the thermal effect of current carrying resistance. Substituting "electricity" for "combustion" is the only way for the whole metal smelting and processing industry to achieve the national carbon neutralization goal on time.

In recent 20 years, with the development of power semiconductor power devices, induction heating has developed very rapidly. The traditional heating methods of industrial resistance furnace and flame furnace will be gradually replaced by induction heating, which is energy-saving, environmental protection, safety and known as "green heating". In this field, superconducting strong magnetic pole low-frequency induction heater, as the "pearl on the crown" product in electric induction heating equipment, will quickly stand out in this product transformation of carbon neutralization.

The basic principle of superconducting induction heating is that the superconducting wire with zero resistance is wound into a magnet to produce a strong stable magnetic field. Then hold the workpiece with the mechanical gripper and rotate it in the magnetic field under the drag of the motor, so as to generate eddy current and realize the heating of the workpiece. High efficiency and energy saving are the outstanding advantages of this heating method. In the traditional power frequency furnace, a large amount of heat energy is consumed on the copper coil generating the magnetic field and is not injected into the workpiece, so the heating efficiency is less than 50%. Superconducting induction heating, due to its zero resistance characteristics, produces a strong magnetic field and only consumes some low-temperature refrigeration loss. Combined with the mechanical transmission loss, the total loss will not exceed 20%. Therefore, the heating energy efficiency can be greatly improved to more than 80%. This means that a 1MW superconducting furnace can replace the traditional 2.5MW power frequency furnace. One year's operation can save 6 million kwh for customers. In addition, it can also save power capacity increase fees and future carbon emission targets.

Another core advantage is the ultra-high heat penetration depth. The heating power of the induction furnace is directly proportional to the product of magnetic field and frequency. Because the magnetic field of the superconducting furnace is more than 100 times that of the traditional power frequency furnace, the superconducting furnace can realize extremely low frequency heating of about 5Hz. The heat penetration depth is increased from 7mm to 200mm. This means that in the whole field of metal heating, mankind has finally found a method to synchronously heat large-diameter metals from the heart to the surface. This will not only open up a new plan for the improvement of the whole metal hot working quality in the future. It can increase the metal processing capacity by adjusting the process to achieve rapid heating without increasing the power of heating equipment, which will further save carbon emission indicators for enterprises.

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