There is a protective system inside the heat exchanger inside the furnace, which is to protect it from operating during the operation. It is understood that the heating furnace air heat exchanger automatic protection system to improve the role of heating efficiency. The combustion air required for the combustion of the furnace is the hot air provided by the heat exchanger installed in the flue for preheating. Therefore, the normal heat exchanger is directly related to the use of heating furnace. And the heat exchanger is a metal tubular structure, which means that the protection of the heat exchanger is to prevent the temperature is too high, so as to avoid the heat exchanger burned.
From the furnace exhaust furnace exhaust temperature, the temperature is generally as high as 600 ¡æ -1100 ¡æ. Take away the heat of the fuel supply heat of 30% -70%, reduce the fuel consumption of industrial furnaces, the most effective way to save energy is recycling Heat dissipation of high temperature flue gas. Used to preheat the combustion of air, the recovery of heat back to the furnace, play a direct role in saving fuel. In order to prevent the air heat exchanger from being burned off when the preheater air temperature is too high, an air release pipe is provided on the air change manifold of the heat exchanger and is equipped with an automatic relief valve for hot air temperature exceeding the set value Automatically increase the amount of preheated air and open the valve to let loose part of the hot air. In order to reduce the heat through the heat exchanger temperature, to protect the purpose of heat exchanger.
Heat exchanger automatic protection device of the single-chip microcomputer controller, the analog input for the temperature and pressure signals, the need for A / D conversion, from the accuracy of 8 bits is enough; other input signal also includes the start signal. The setting of the start signal takes into account the automatic protection of the heat exchanger and the conversion of the manual control. Only when the microcontroller receives the start signal, began to automatically protect the control.