refers to the equipment (industrial furnace) that heats materials or workpieces (generally metal) to rolling forging temperature in the metallurgical industry, and can be divided into continuous heating furnace and chamber heating furnace. Heating furnaces are widely used in petroleum, chemical industry, metallurgy, machinery, heat, building materials, electronics, materials, light industry, and many other industries. The steel rolling heating furnace in the metallurgical industry is used to heat the steel parts that need to be rolled. According to different process requirements, it is required to maintain a certain temperature in the steel rolling heating furnace cavity. The temperature is obtained by burning fuel, and the effective combustion of fuel is controlled by the air volume blown by the blower of the heating furnace.
Generally, the air volume and air pressure of the heating furnace fan are adjusted by manually changing the butterfly valve in front of the fan inlet. The motor has been running at full pressure and full speed, and the start and stop methods are realized by switching the contactor. This working method makes the entire system energy-saving. Poor, inconvenient to debug, and high failure rate of equipment. These shortcomings can be improved after using the frequency converter in the system. Next, let's introduce the application of EN500-560KW frequency converter on the heating furnace fan in a large ironworks.
Structural composition: The heating furnace is generally composed of five parts: radiation chamber, convection chamber, waste heat recovery system, burner and ventilation system. Its structure usually includes: steel structure, furnace tube, furnace wall (furnace lining), burner, hole accessories, etc. Among them, the function of the ventilation system is to introduce the combustion air into the burner and lead the exhaust gas out of the furnace. It is divided into natural ventilation and forced ventilation in two ways. The former relies on the suction of the chimney itself, while the latter uses a fan.
Main principle: Use the high-temperature flame and flue gas generated when the fuel burns in the furnace as a heat source to heat the medium flowing in the furnace tube to make it reach the specified process temperature. The fuel is sprayed from the burner to generate high-temperature flame and high-temperature flue gas. The high-temperature flame transfers heat to the furnace tube in the radiation chamber through radiation, and then to the medium in the furnace tube. The high-temperature flue gas enters the convection chamber of the heating furnace
upward due to the suction force of the chimney or the action of the induced draft fan, and transfers heat to the furnace tube in the convection chamber by convection, and then to the medium in the furnace tube.
The 560KW large blower in the ventilation system of the on-site heating furnace is driven by the EN500 560KW frequency converter. Constant speed, so as to change the motor speed, to achieve the purpose of changing the air pressure and air volume. There is also a set of 315KW fan and Ener EN500 315KW frequency converter on site for backup. Application advantages
After the heating furnace
ventilation system adopts EN500 series frequency converter, the energy saving effect of the system is remarkable, the power consumption is greatly reduced, the effect of saving fuel is achieved, and the maintenance cost is also reduced.
EN500 series frequency converter has wide speed range, high precision, convenient debugging, wind pressure and air volume can be changed according to process requirements, which reduces labor intensity of workers, improves quality and increases output.
EN500 series inverters have powerful protection functions, and can provide complete over-current, over-voltage, under-voltage, overload and other protection functions to make the system run more stable and reliable, which has won the trust of users.