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Analysis of the Causes of Excessive Temperature of Diesel Engine Fire Pump

2019-08-14
 The engine cooling system of the diesel fire pump uses a double closed loop heat exchanger. The system has the advantages of high cooling efficiency and little influence on the ambient temperature of the pump house. The cooling water flows from the pump outlet pipe to the heat exchanger by the ball valve, so that the body cooling water temperature is between 85 and 95 °C. If the water temperature is too high, the opening of the ball valve can be increased, the heat dissipation capacity of the heat exchanger can be increased, and the water temperature of the engine cooling water can be lowered. Instead, the opening of the ball valve can be closed to increase the water temperature of the engine cooling water.
The diesel engine fire pump group, such as the automatic control fire pump group, adds a solenoid valve in parallel with the ball valve in the heat pipe. In general, the solenoid valve is closed, and the cooling water can meet the engine cooling requirements through the gate valve. When the engine cooling water temperature exceeds 95 ° C, the solenoid valve will automatically open, increasing the cooling water flow and reducing the engine cooling water temperature. After 20 seconds, the water temperature of the diesel engine still exceeds 95 ° C, the automatic control system will give an audible and visual alarm, and call the staff to the site to check the cause.
There are several reasons why the temperature of a diesel engine fire pump is too high:
1: Diesel engine fire pump overload operation. Therefore, in the operation of the fire pump, high-speed, overload operation of the diesel engine must be avoided.
2: The oil radiator of the diesel engine fire pump is blocked by foreign matter, resulting in poor heat dissipation;
3: The oil temperature adjustment switch of the diesel engine fire pump is not in the correct position. In summer, the oil will not dissipate heat through the radiator;
4: The cylinder of the diesel engine fire pump leaks, and the high temperature gas enters the oil pan and heats the oil of the oil pan.
5: The cooling fan speed of the air cooler of the diesel engine fire pump is too low, which reduces the cooling intensity and raises the temperature of the diesel engine.