ã€Abstract】 When corundum is smelted, a large amount of high-temperature flue gas will be produced, which can be recycled and used to provide industrial and domestic hot water or to heat buildings. This will not only reduce the pollution discharge of industrial enterprises, but also greatly reduce The original energy consumption of industrial enterprises. This article mainly introduces the development of waste heat utilization technology and the utilization of residual corundum smelting industry. I. Introduction Energy-saving emission reduction is a long-term strategic guideline for China's economic and social development and an extremely urgent task. The rapid economic growth in our country has made tremendous achievements in all aspects of construction. However, enormous resources have been paid and the environment has been destroyed. As a result, the contradictions between the two have become increasingly acute and the masses have reacted strongly to environmental pollution. This situation is directly related to the unreasonable economic structure and the mode of growth. We will not speed up the readjustment of the economic structure, change of the mode of growth, fail to support resources, accommodate the environment, afford the society, and make economic development unsustainable. Only by adhering to the principle of saving development, clean development and safe development can the sound and rapid economic development be achieved. Waste heat is secondary energy, if you can once again use the heat generated by the combustion or melting of materials, it will increase the utilization of energy and reduce the cost of the enterprise. For the corundum smelting industry, when smelting will produce a lot of heat, and this part of the heat are generally not used by enterprises, but after the dust will be excluded, and businesses need heat to heat or need shower heat Water, if we can better combine the two parts, then it can bring benefits to the enterprise, but also to achieve the purpose of energy-saving emission reduction, enterprises and countries to achieve a win-win situation. Second, waste heat utilization The waste heat we are talking about is mainly industrial waste heat. Industrial waste heat mainly refers to low-grade energy such as waste heat, waste water and waste gas discharged from thermal conversion equipment and energy-using equipment of industrial and mining enterprises in the process of production. This waste heat recovery technology recycles this low grade energy source to provide industrial and domestic hot water or Heating the building can not only reduce the pollution discharge of industrial enterprises, but also greatly reduce the original energy consumption of industrial enterprises [1]. Waste heat resources are those resources that can be recycled but not yet utilized under the current conditions. In general, from its sources can be divided into several types of high temperature flue gas waste heat and cooling medium heat. In our country, the recovery rate of waste heat resources in the production departments of all enterprises is less than 40%, which means that the potential for waste heat recovery in China is huge. Therefore, making better use of waste heat resources is one of the most important ways to save energy and reduce emissions, clean development and safety [2]. Due to the use of production methods, production processes, production equipment and raw materials, fuel conditions and the process of ever-changing needs, resulting in waste heat utilization has brought many difficulties. However, how to make better use of waste heat and make it exert its due effect is the direction that people care about and develop. With the difference of production technology and service conditions, the waste heat heat source also produces a certain degree of certainty for its better recycling Of the obstacles, for the characteristics of brown corundum smelting industry and the way heat generated, the use of waste heat often have the following two difficulties: (1) heat source is not stable. This is mainly related to the preparation process. For example, the production of corundum is cyclical and the heat provided by the heat source in the production process also fluctuates with the production fluctuations. (2) dust in dust content. In particular, when the temperature of the flue gas is high and the amount of dust is large, it is easier to bond and deposit ash, which may cause serious wear and clogging of the equipment for waste heat recovery. Waste heat resources can be divided into three categories according to their temperature: high temperature waste heat (waste heat resources with temperature higher than 500 ℃), medium temperature waste heat (waste heat resources with temperature 200-500 ℃), low temperature waste heat (flue gas with temperature lower than 200 ℃ And liquids below 100 ° C). Residual heat resources, as they belong to the secondary energy, so in the course of their primary energy consumption should reduce primary energy consumption and reduce the number of unnecessary energy conversion. In practice, the heat exchanger is used for direct heat exchange, the water is heated by waste heat or the material is dried to remove moisture. Third, the type and characteristics of commonly used heat exchangers Tubular heat exchangers: Two different fluids heat transfer in the shell, one in the tube and one in the tube. Features are solid structure, flexible adaptability, wide range of materials. Residual heat temperature range allows the inlet flue gas temperature of more than 1000 ℃, export flue gas temperature of about 600 ℃, the average temperature difference of about 300 ℃. Plate heat exchanger: The main structure of the heat exchanger plate and the strip between the plates, used in liquid - liquid heat exchange. Characterized by the heat transfer coefficient is about 2 times the tube, heat transfer efficiency, compact structure, save material. Waste heat temperature range is about 700 ℃ inlet flue gas temperature, outlet temperature up to 360 ℃. Ceramic heat exchanger: a new type of tube heat recovery device, the main component of silicon carbide. Good thermal conductivity, high strength, anti-oxidation, thermal shock resistance. Long life, small maintenance, reliable performance and stability, easy to operate. Allow 1550 ℃ waste heat into the heat exchanger, combustion air can be preheated to 815 ℃. Heat pipe heat exchanger: An efficient heat transfer element that transfers heat through the evaporative and condensing phase change process of the working fluid in the hermetically sealed vacuum tube and heat exchange between the two walls, combining heat storage and heat exchange. Excellent thermal conductivity, high heat transfer coefficient, has a good isothermal, controlled temperature, heat delivery ability. The working temperature of the heat pipe is widely distributed and used in practical applications
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