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What Is Diesel Generator Set Circulating Cooling System

Nov. 12, 2018

The cooling system of the diesel generator set is forced liquid cooling, or pressure liquid cooling, that is, the diesel generator set has a dedicated cooling water pump to complete the circulating flow of the diesel generator coolant. According to the conditions of use of the diesel generator set, open cycle cooling or closed cycle cooling may be employed. Let's share the working principle of the open-circuit cooling system of the diesel generator set.

What Is Diesel Generator Set Circulating Cooling System.jpg


The open-type circulating cooling system, that is, the inlet and outlet of the diesel generator set is open, and the user directly turns on the water source during use. Depending on the layout of the diesel generator set and the oil cooler, the types of open-circuit circulating cooling systems are slightly different.


When the diesel generator set is working, the inlet water temperature is required to be not lower than 60 °C. Therefore, appropriate measures should be taken to adjust the appropriate inlet water temperature for the water used in the open-loop cooling system. Generally, a mixing bucket can be installed between the water source and the diesel generator set, and the inlet and outlet of the diesel generator set and the water from the water source can be connected to the mixing bucket, and the diesel generator set can be controlled by controlling the amount of cold water entering the mixing bucket. Inlet temperature.


Diesel generator sets are not allowed to have air resistance and water cut during operation, especially when the diesel generator set is parked for a long time, it is more prone to waterway air resistance. Because the gas resistance or water cut will cause the diesel generator set to overheat, and even serious accidents such as pulling the cylinder, it should be promptly removed. If there is air resistance: the water volume of the cylinder head outlet pipe is reduced or the water is not discharged at all, the reading of the water temperature meter rises sharply. At this time, do not stop the emergency. The load should be appropriately reduced, the rotation speed should be reduced, and the water temperature at the outlet end of the cylinder head should be quickly released. The susceptor releases the air in the waterway until the cooling water flows out and the water temperature returns to normal. Be careful when deflated to prevent heat from injuring people.


The difference between small cycle and large cycle of diesel generator set


During the operation of diesel generator sets, there are often cases where the coolant does not circulate, including large cycles, no small cycles, or small cycles without large cycles, resulting in a rapid rise in cylinder temperature and an increase in oil temperature. The sudden shutdown and other phenomena directly affect the safe use of diesel generator sets. So what is the small cycle and large cycle of the diesel generator set?


The difference between small cycle and large cycle of diesel generator set


Diesel generator set small cycle


When the temperature of the cooling water of the engine is lower than the opening temperature of the thermostat, the thermostat is in a closed state, and the cooling water of the engine outlet flows back into the water jacket of the cylinder block through the water pump for small circulation.


Diesel generator set big cycle


When the cooling water temperature reaches the set value or above (different engines have different requirements for the opening temperature of the thermostat), in order to control the engine cooling water within the specified temperature, the thermostat is opened and the cooling water of the engine outlet is opened. It flows to the radiator for cooling and then flows into the engine cooling channel via the pump.


Analyze the cause of the generator coolant not circulating


The non-circulation of the generator coolant has a great impact on the operation of the equipment. Today, the Guangxi Guangxi technicians will teach you how to judge the reason why the coolant does not circulate.


1. Diesel generator pump failure. First of all, we must first check whether the pump is working well. If it is found that the pump drive pinion wears too much, the pump has no effect and needs to be replaced before it can be cycled normally.


2. The coolant level of the diesel generator set is too low or does not meet the requirements. If the liquid level is too low, the temperature of the coolant will increase directly, so that the coolant will not circulate. The coolant is 50% antifreeze + 50% softened water + DCA4 according to the regulations. If it does not meet the requirements, the pipeline will be blocked and the pipe wall will be produced. Rust prevents the coolant from circulating properly.


3. The diesel generator set thermostat is faulty. A thermostat is installed in the combustion chamber of the engine to control the temperature of the engine combustion chamber. The thermostat must be fully opened at the specified temperature to facilitate small circulation. If there is no thermostat, the coolant cannot maintain the circulating temperature, and a low temperature alarm may occur.


4. The air in the cooling system of the diesel generator set is mixed, which causes the pipeline to be unobstructed. The damage of the suction valve and the exhaust valve on the expansion tank directly affects the circulation. At this time, it should be checked frequently whether the pressure value meets the requirements. The suction pressure is 10kpa. The exhaust pressure is 40kpa. Except for the exhaust pipe, it is also an important reason for the circulation.


5. The radiator of the diesel generator set is blocked or damaged. The cooling fan does not work or the heat sink is clogged, so that the temperature of the coolant can not be lowered, and the heat sink is rusted, causing liquid leakage, which can also cause poor circulation.



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