Common four combustion technologies in industry
1: High-temperature air combustion technology
Also called regenerative combustion technology, it is an efficient waste heat recovery energy-saving technology. Regenerative combustion technology refers to alternately switching air or gas fuel and flue gas to make it flow through the regenerator, and it can recover the sensible heat of the high-temperature flue gas to the maximum extent. The flue gas temperature can fall below 180° C., and it can help the combustion. The medium or gaseous fuel is preheated to over 1000°C, forming a new type of flame that is different from the traditional flame, and reversing the combustion to make the temperature distribution in the furnace more uniform. At present, China has successfully applied regenerative combustion technology to industrial kilns such as glass furnaces, aluminum furnaces, forging furnaces, and ladle roasters in rolling mills.
2: Pulse Combustion Technology
is a method of intermittent combustion. Pulse width modulation technology is used to control the temperature of the furnace by adjusting the on-off ratio of the combustion time. This technology is relatively easy to control the furnace temperature of the furnace, so the temperature field inside the furnace is even and the temperature fluctuation is minimal, and it can also save fuel. In recent years, this technology has been gradually applied in the control of combustion systems of industrial furnaces such as metallurgy and ceramics with good results.
3: Oxygen-enriched combustion technology
A highly efficient, enhanced combustion technique with oxygen content in the combustion air that exceeds conventional values. Oxygen-enriched combustion technology can reduce the ignition point of the fuel, accelerate the combustion reaction rate, 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 application in high-temperature industrial furnaces, such as metal heating furnaces and glass melting furnaces, etc. There are data that forged heating furnaces use 23%~25% of oxygen-enriched air to help fuel, which can save 1/4 of the fuel.
4: Staged combustion technology
means that the insufficient amount of air is sent to the main combustion zone by changing the air supply method to form excess oxygen-deficient fuel, and then the remaining air is added in the second-stage combustion zone to form a lean-burn fuel zone to complete the entire combustion. process. Staged combustion can reduce the emission of nitrogen oxides. According to the results of the project, the use of graded air combustion technology will reduce the emission of nitrogen oxides in the exhaust gas by about 35%.
