The main reason why the exhaust temperature of 500 kW generator set is too high

Introduction The main reasons for the excessively high exhaust temperature of the 500 kW generator set are ① the exhaust valve of the diesel generator set is not closed well; ② the fuel supply advance angle is too late; ③ the diesel generator set is overloaded; Depend

The main reason why the exhaust temperature of 500 kW generator set is too high

①The exhaust valve of the diesel generator set is not closed tightly;

②The advance angle of the fuel supply is too late;

③The diesel generator is overloaded. According to the working conditions, the diesel generator set was found not to work under overload conditions and the valve clearances were checked to be within the specified range. Finally, it was found that the advance angle of the fuel supply of the diesel generator set was found. It was too late. After readjusting the fuel feed advance angle, the fault disappeared. This is also what causes early damage to the turbocharger.

1) When the temperature is low, the combustion conditions of diesel in the cylinder deteriorate, the fuel atomization is poor, the combustion period after ignition is prolonged, and the engine is prone to rough operation, which aggravatesve damage to crankshaft bearings, piston rings and other parts, and reduces power economy.

2) Water vapor after combustion easily condenses on the cylinder wall, causing metal corrosion.

3) Diesel combustion can dilute engine oil and worsen lubrication conditions.

4) The fuel is not completely burned and forms a colloid, causing the piston ring to become stuck in the piston ring groove, the valve to become stuck, and the internal force of the piston to decrease. cylinder at the end of compression.

5) The water temperature is too low and the engine oil temperature is too low. Engine oil becomes thicker and fluidity becomes poor. The amount of oil pumped by the oil pump is low, resulting in insufficient oil. power supply to the generator. In addition, the crankshaft bearing clearance becomes smaller and the lubricationation is reduced. Many operators do not want diesel generators to run at operating speeds. They believe that lower speeds will not cause a breakdown. In fact, too low a speed will also cause bad consequences, as follows:

1) Too low a speed will reduce the power output of the diesel engine and reduce its power;

2 ) Too low rotation speed will cause the working speed of each component to decrease, which will deteriorate the working performance of the components, reduce the output pressure of the oil pump, etc. ;

3) Reduce the reserve power of the diesel engine, which must be in normal operation. The diesel engine is under full load or overload.

4) If the speed is too low, the speed of the engine working machines; the linkage mechanism will also be reduced, which will reduce the mechanical performance of the work, such as reduction of the water flow of the water pump, the reduction of the water pump. The elevator, etc.

What should be the rated generator inlet air temperature and outlet air temperature?

The main causes of excessive generator set temperature diesel are:

1. Long-term diesel engine When hard water is used, a large amount of scale will form in the water tank and waterways, resulting in poor heat dissipation.

2. There are too many impurities deposited in the water channels between the body and the cylinder head, which blocks water circulation and results in poor heat dissipation.

3. Seriously burns engine oil, causing excessive carbon deposits and poor heat dissipation.

4. Improper operation and use. When starting the diesel engine, you must first use a small or medium throttle to preheat pend a certain time. Do not suddenly increase the throttle or suddenly increase the load, otherwise the diesel engine will run abruptly and the temperature will rise sharply. Or, long-term overload operation of the diesel engine will also cause the diesel engine to become too hot.

5. Delaying fuel delivery too late will cause the diesel engine to overheat.

6. Put it into operation at full load immediately after repair, causing overheating or jamming of moving parts due to too little mounting clearance.

7. Insufficient cooling water causes the diesel engine to overheat.

If the temperature of the diesel engine of the diesel generator set is too high, it will cause reduced matching clearance, resistance and poor lubrication of moving parts. In severe cases, this can cause the cylinder to pull. and the accidentsshaft retaining nts. Therefore, when the temperature of the diesel generator set is too high, it is necessary to repair it quickly.

The inlet air temperature is ambient temperature; the outlet air temperature should not exceed 40°C.

According to international technical requirements, the ambient operating temperature of the generator is set at 40°C. All designs and wattages are based on this ambient temperature. For generators, ambient temperature is the inlet air temperature of the generator. Since the generator works with the diesel engine, the heat generated by the diesel engine will cause the entire space to exceed 40°C.

The ambient temperature of the generator during actual operation should not exceed 40°C. If the actual ambient temperature exceeds 40°C, the generator must operate at reduced power. For ambient temperature, if it is lower than40°C, the generator power may be higher than the rated power.

Detailed information:

Generator usage requirements:

< p>1. Check that the transmission parts of the internal combustion engine and generator should be reliably connected, the output line wires should be well insulated, and all instruments should be complete and efficient.

2. After starting, it should run at low speed for 3-5 minutes. The operation can only be started after the oil temperature and pressure are normal. There should be no abnormal noise when the generator accelerates, the slip ring and commutator brushes should be in good contact, and there should be no jumps or sparks.

3. Before stopping, you must first turn off the main switches of each power branch, gradually reduce theload, turn off the generator main power switch and return the excitation rheostat to maximum. resistance position to reduce the voltage to the lowest value. Turn off the excitation switch and neutral point grounding switch to stop the internal combustion engine.

Baidu Encyclopedia - Generator Reverse Power

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