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Luofu Boiler - Research on the Status Quo and Future Trend of Energy Saving and Emission Reduction of Industrial Furnace
Taking effective measures to reduce the waste of resources and environmental pollution caused by furnace kiln production is one of the key issues for the reform and exploration of industrial production roads by the Chinese government in recent years. The promotion of energy-saving renovation projects in industrial production has become a solution to industrial production and the environment. The main route between tensions. Taking effective measures to reduce the waste of resources and environmental pollution caused by furnace kiln production is one of the key issues for the reform and exploration of industrial production roads by the Chinese government in recent years. The promotion of energy-saving renovation projects in industrial production has become a solution to industrial production and the environment. The main route between tensions. The research and development and application of technology in industrial energy-saving production at home and abroad have achieved remarkable results. However, due to the late start of China, there are still many problems in this field that need urgent improvement and improvement. Therefore, government departments and researchers need to continuously strive to To ensure that in the near future, a perfect industrial production energy-saving system with Chinese characteristics will be formed.
Use new environmentally friendly energy sources as fuel to reduce environmental pollution.
The energy sources of traditional industrial production are mainly coal and oil. The expansion of industrial production scale on a global scale has made the energy crisis more and more serious, resulting in a sharp rise in energy prices, which is beyond the reach of countries. At the same time, industrial production is inevitable. It will cause environmental pollution problems to deteriorate, and the consequences of industrial waste emissions are affecting the normal production and life of human beings. In order to alleviate the above problems, all countries are committed to the development and application of new alternative energy materials. Currently, the new alternative energy sources are non-bio-energy, the cost of bio-energy is low, and raw materials are everywhere, which is industrial energy-saving production. best choice. New biofuels have received worldwide attention in recent years, and countries have successively carried out research and development of biofuels to replace traditional high-energy and high-pollution raw materials such as coal and petroleum. The manufacturing mechanism of biofuels is a new source of renewable energy by extracting and utilizing organic matter that the body itself can use to create energy by photosynthesis, and extracting energy that can be effectively utilized by people. In the bioenergy manufacturing process, both animals and plants and microorganisms can be used for energy development and manufacturing. At present, foreign countries mainly develop ethanol materials as a new energy source, while China is committed to obtaining bioenergy from agricultural production. Compared with traditional energy sources, bioenergy has the following advantages: First, the source of energy is diverse and easy to obtain. For example, crop straw produced by agricultural production, animal waste, organic waste discharged from industrial production and life, and a large number of energy-rich animals and plants, which are abundant in nature, easy to obtain, and capable of being regenerated. The advantages. Second, the variety of energy products is available, providing a variety of options for industrial production. Energy produced by biotransformation technology can present different types of expressions, such as biogas, ethanol. Energy and various solid energy materials, which can be widely used in industrial production, and will not cause any pollution to the environment, and at the same time, recycle waste in industrial and agricultural production, and truly realize waste turning into treasure. Third, in the production and manufacturing process of new bioenergy, it can effectively promote the development of related production industries, not only can reduce the cost of industrial production, but also promote the increase of farmers' income and income, and help narrow the gap between the rich and the poor in rural areas and cities. Finally, bioenergy has the advantage of being recyclable. Since its raw material source is organic organisms in nature, it can promote the absorption of carbon dioxide by plants, which will be disadvantageous.
Develop and utilize new combustion technologies
The adoption of new industrial combustion technology is also an effective way to save energy and reduce emissions. At present, the combustion technologies widely used in China mainly include the following.
High-temperature air combustion technology, also known as regenerative combustion technology, is an efficient waste heat recovery energy-saving technology. The regenerative combustion technology refers to alternately switching air or gaseous fuel and flue gas to flow through the regenerator, which can recover the sensible heat of the high-temperature flue gas to the greatest extent, and the exhaust gas temperature can be lowered to below 180 ° C, which can be used for combustion. The medium or gaseous fuel is preheated to above 1000 °C to form a new flame type different from the conventional flame, and the commutation combustion makes the temperature distribution in the furnace more uniform. At present, China has successfully applied regenerative combustion technology in industrial furnaces such as steel kiln, aluminum melting furnace, forging furnace and ladle roaster.
Pulse combustion technology is a discontinuous combustion method that uses pulse width modulation technology to achieve temperature control of the furnace by adjusting the on-off ratio of the combustion time. This technology makes it easier to control the furnace temperature of the furnace, so the temperature field in the furnace is uniform and the temperature fluctuation is extremely small, and fuel can be saved. In recent years, this technology has been gradually promoted and applied in the control of industrial furnace combustion systems such as metallurgy and ceramics, with good results.
Oxygen-enriched combustion technology is an efficient intensive combustion technology with oxygen content in combustion-supporting air exceeding conventional values. Oxygen-enriched combustion technology can reduce the burning point of fuel, speed up the combustion reaction, promote complete combustion, reduce the excess air coefficient, reduce the amount of flue gas after combustion, and thus improve the efficiency of heat utilization. Oxygen-enriched combustion technology is more suitable for high-temperature industrial furnaces, such as metal heating furnaces and glass melting furnaces. There are data showing that forging furnaces can save 1/4 of fuel if they use 23%~25% oxygen-enriched air to support combustion. The staged combustion technology means that the insufficient amount of air is sent to the main combustion zone by changing the air supply mode to form an excess combustion of the oxygen-deficient fuel, and then the remaining air is added in the second-stage combustion zone to form a lean combustion zone of the fuel to complete the combustion. process. Staged combustion can reduce the emission of nitrogen oxides. According to the results of the project operation, the nitrogen oxide emissions in the exhaust gas are reduced by about 35% after using the graded air combustion technology.
Effective reuse of by-products produced during the production process
Industrial furnace waste heat mainly refers to the sensible heat of the discharged combustion products and the sensible heat taken away by the heated product. The amount of heat taken by these sensible heats is large. If they can be used well, their economic and social benefits are significant residual heat of medium and high temperature flue gas. The main utilization methods include: using waste heat boiler to produce steam or heating heat transfer oil for direct use, using heat exchanger to preheat combustion air, and steam production from waste heat boiler and steam steam turbine to generate steel heating furnace as an example, rolling steel heating furnace is released. The smoke temperature is about 1000 °C. The high-efficiency air and gas preheater is installed in the flue to preheat the combustion air and gas. The air can be preheated to 600 °C, the gas is preheated to 300 °C, and the fuel consumption per ton of steel can be reduced by 0.3GJ. .
Low-temperature flue gas waste heat generally refers to the waste heat of flue gas with a temperature lower than 400 °C. Although the residual heat is low, the amount of waste heat is very large. Now, pure low-temperature waste heat power generation technology is generally used to save energy and reduce economic consumption. For example, a cement plant converts waste heat from low-temperature exhaust gas below 400 °C into electrical energy and uses it for production, which can reduce the overall power consumption of cement clinker production by about 60%, or reduce the overall power consumption of cement production by about 33%.
The residual pressure recovery power generation technology refers to the use of the residual pressure of the exhaust gas generated by the industrial furnace to directly generate electricity. For example, a steel plant blast furnace top gas residual pressure turbine power generation device is a device that uses the pressure energy of the blast furnace top gas to perform work by turbine expansion to drive the generator to generate electricity.
In recent years, China's technical level in industrial furnace and kiln production has been significantly improved, but compared with other countries, there is still room for improvement in energy conservation and emission reduction, in order to fundamentally realize the full use of energy. At the same time, it will take a long time to achieve zero pollution emission to the air. For this reason, we should further increase R&D and improvement on the basis of energy-saving technologies that have already achieved results, and finally achieve the goal of reducing skills and achieve Sustainable development of human society.