Heating furnace air heat exchanger automatic protection system
There is a protection system inside the furnace air heat exchanger, which protects it from errors during operation. It is understood that the heating furnace air heat exchanger automatic protection system improves the heating efficiency. The combustion air required for the combustion of the furnace is the hot air supplied by the heat exchanger installed in the flue. Therefore, the normality of the heat exchanger is directly related to the use of the furnace. The heat exchanger is also a metal tubular structure, which means that the protection of the heat exchanger is to prevent the temperature from being too high, so as to avoid burning the heat exchanger.
The flue gas discharged from the tail of the industrial furnace is generally as high as 600 ° C -1100 ° C. The heat taken away accounts for 30%-70% of the fuel supply heat, which reduces the fuel consumption of the industrial furnace. The most effective way to save energy is to recycle. The residual heat of high temperature flue gas. It is used to preheat the combustion air and return the recovered heat to the furnace to directly save fuel. In order to prevent the air heat exchanger from being burnt out when the preheater air temperature is too high, an air release pipe is arranged on the air exchange main pipe of the heat exchanger and an automatic release valve is installed for the hot air temperature exceeding the set value. Automatically increase the amount of preheated air and open the valve to dissipate a portion of the hot air. In order to reduce the temperature of the hot air passing through the heat exchanger, the purpose of protecting the heat exchanger is achieved.
The single-chip microcomputer controller of the heat exchanger automatic protection device has analog input quantity as temperature and pressure signal, and needs A/D conversion. It is enough to consider 8 bits from the accuracy; other input signals also include the start signal. The setting of the start signal takes into account the conversion of the automatic protection and manual control of the heat exchanger. The automatic protection control is started only when the MCU receives the start signal.