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Four common combustion technologies in industry

Category: Industry News Publish Time：2018-10-08

Air combustion technology, also known as regenerative combustion technology, is a highly efficient waste heat recovery and energy-saving technology. Regenerative combustion technology refers to the alternating switching of air or gas fuel and flue gas through a heat storage medium, which can maximize the recovery of sensible heat from high-temperature flue gas. The exhaust gas temperature can be reduced to below 180℃, and the combustion medium or gas fuel can be preheated to above 1000℃, forming a new type of flame different from traditional flames, and the combustion direction is changed to make the temperature distribution in the furnace more uniform. At present, China has successfully applied regenerative combustion technology to industrial furnaces such as steel reheating furnaces, glass kilns, aluminum melting furnaces, forging furnaces, and steel ladle baking ovens.

　　Warm Air Combustion Technology

　　Also known as regenerative combustion technology, it is a highly efficient waste heat recovery and energy-saving technology. Regenerative combustion technology refers to the alternating switching of air or gas fuel and flue gas, allowing them to flow through the regenerator. This maximizes the recovery of sensible heat from high-temperature flue gas, reducing the exhaust gas temperature to below 180℃. It can preheat the combustion medium or gas fuel to over 1000℃, forming a new type of flame different from traditional flames, and the combustion direction is changed to make the temperature distribution in the furnace more uniform. Currently, China has successfully applied regenerative combustion technology to industrial furnaces such as steel reheating furnaces, glass kilns, aluminum melting furnaces, forging furnaces, and ladle baking ovens.

　　Pulse Combustion Technology

　　This is a type of intermittent combustion method that uses pulse width modulation technology to control the temperature of the kiln by adjusting the on-off ratio of the combustion time. This technology makes it easier to control the furnace temperature of the heating furnace, so the temperature field in the furnace is uniform, the temperature fluctuation is minimal, and fuel can be saved. In recent years, this technology has been gradually promoted and applied in the combustion system control of industrial furnaces in metallurgy, ceramics, and other industries, with good results.

　　Oxy-fuel Combustion Technology

　　This is a highly efficient and enhanced combustion technology in which the oxygen content in the combustion air exceeds the conventional value. Oxy-fuel combustion technology can lower the ignition point of the fuel, accelerate the combustion reaction rate, promote complete combustion, reduce the excess air coefficient, and reduce the amount of flue gas after combustion, thereby improving the utilization efficiency of heat. Oxy-fuel combustion technology is more suitable for high-temperature industrial furnaces, such as metal heating furnaces and glass melting furnaces. Data shows that if 23%~25% oxy-fuel air is used for combustion in forging heating furnaces, 1/4 of the fuel can be saved.

　　Staged Combustion Technology

　　This refers to changing the air supply method to send an insufficient amount of air into the main combustion zone, forming oxygen-deficient fuel-rich combustion. Then, the remaining air is added in the secondary combustion zone to form a fuel-lean combustion zone, completing the entire combustion process. Staged combustion can reduce nitrogen oxide emissions. According to the project operation results, after adopting staged air supply combustion technology, the emission of nitrogen oxides in the exhaust gas is reduced by about 35%.

Keywords: Four common combustion technologies in industry

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