The working temperature of the diesel generator set, what is the matter with the high operating temp

After the unit is started to run, it will run for about 4-6 hours at full load, and the temperature and temperature rise of the generator will exceed the specified value. The maximum allowable temperature and temperature rise of generators and their parts are also different for different insulation levels.

The working temperature of the diesel generator set is 80 to 85 degrees.

After cold start or driving, the engine temperature is difficult to rise to the normal working temperature range, and the engine is overcooled, mainly due to the poor technical condition of the automobile insulation device and thermostat used in the cold season or area.

1) Causes. The thermostat valve is not closed tightly, and the engine heats up slowly after cold starting, and is in a cold state for a long time, especially in winter.

The thermal insulation device has poor working performance, loses the thermal insulation effect of the radiator, and the cold air flowing through the radiator and the engine cannot increase or decrease with the needs of the engine's thermal condition, so that the engine is supercooled.

The fan with clutch loses its function of adjusting the fan speed due to failure, resulting in excessive exhaust air volume and causing the engine to be subcooled.

2) Diagnosis and treatment.

First of all, check whether the engine radiator front insulation device is working well. If it is defective, it should be adjusted or repaired so that the blinds can work freely and flexibly adjust with the temperature of the engine.

Troubleshoot silicone clutch fans.

According to the inspection method of the thermostat to see whether its working performance is good, if it is found that the main valve can not be closed, it should be replaced.

The main reasons for the high temperature of diesel generator sets are:

1. The diesel engine uses hard water for a long time, and a large amount of scale is formed in the water tank and waterway, resulting in poor heat dissipation.

2. There are too many impurities deposited in the waterway of the body and the cylinder head, which makes the water circulation unsmooth and causes poor heat dissipation.

3. Serious burning of engine oil, resulting in excessive carbon deposits and poor heat dissipation.

4. Improper operation and use. Starting the diesel engine should be preheated with a small and medium throttle for a period of time, and the throttle should not be increased suddenly, and the load should be increased violently, otherwise the diesel engine will work rough and the temperature will increase sharply. Or the diesel engine is overloaded for a long time, which will also cause the diesel engine temperature to be too high.

5. The diesel engine is overheated due to the late oil supply time.

6. Put into full load operation immediately after maintenance, causing overheating of moving parts, or jamming due to too small matching gap.

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

The temperature of the diesel engine of the diesel generator set is too high, which will lead to the reduction of the matching clearance of the moving parts, the reduction of strength, poor lubrication, and in serious cases, it may cause the accident of pulling the cylinder and holding the shaft, so when the temperature of the diesel generator set is too high, it should be repaired in time.

Let's talk about the reasons first: There are many reasons why diesel engines overheat.

1. Let's talk about the external ones first, such as overload, long-term throttle overload operation, 2, the problems of the engine itself, such as the problem of the thermometer of circulating water, and the problem of the water-saving valve that cannot open the large circulation normally.

3. There is also a problem with the engine itself, such as holding the tile, pulling the cylinder slightly, or the oil is not good, so that the lubrication of the machine is poor, so the friction coefficient is too large, and the heat is great.

Let's talk about the aspects to solve, 1, the load of the line check, and the current is not within the allowable range to measure the current with an ammeter. It should be noted here that there is a gap between the actual power and the marked power of the generator, which is generally left and right. In order to pursue profits, many small domestic factories use aluminum core wires, which cannot even be reached, for example, the generators marked with 100 kilowatts, the actual power generation of 80 kilowatts is insufficient.

2. If the load is fine, then check the water temperature first, see if there is a problem with the water circulation, see if the fan is running normally, and whether the water can circulate greatly.

3. If all of the above are normal, then it is necessary to start from the mechanical aspect, check whether there is a lack of lubricating oil, and how long has it been since the oil has been changed. The quality and dosage of the oil should be maintained. Not too big, not too little.

If there is no problem with the oil, then you have to find a master, first listen to the engine to see if there is any abnormal noise, check whether there is a cylinder, whether there is a tile, or whether there is a single cylinder fire and other problems...

Yizhong Power Station Diesel Generator Set) What is the reason for the high operating temperature of the diesel generator set:

In addition to the hot weather in summer, it is not normal for diesel generator sets to have a high temperature in use.

1. Whether the diesel generator set is overloaded for a long time;

2. Whether there is water leakage or too little coolant in the diesel generator set;

3. Whether the inside and outside of the cooling system are clean, do a good job of cleaning;

4. Check whether the fan belt is loose and whether the blades are normal;

5. Whether the water temperature sensor or thermostat is operating normally.

The water used in the diesel generator set should be kept at a certain temperature in different seasons, so as to ensure the normal and normal operation of the water temperature of the unit. Compared with the high water temperature, the main reason for the low water temperature is relatively simple, mainly the fault of the thermostat is always open, and its main performance is that the water temperature shows that everything is normal at the beginning, when the unit is running, as the water temperature is getting lower and lower or maintains a low temperature state during the operation of the unit, it must be caused by the thermostat is always open.

If this is not the case, then the water temperature gauge display may fail due to the failure of the water temperature sensor, meter, and circuit, just like when the water temperature is too high.

When the diesel engine is working, the normal temperature of the cooling water should be kept at 75-90 degrees, at this time, the diesel engine can produce the maximum power, the fuel consumption will be close to the economic state, and the degree of wear of the parts is relatively low.

If the cooling system is working abnormally, the temperature of the cooling water is too high or too low, which will not only affect the normal operation of the diesel engine, but even cause failures and accidents. The cooling water should be slightly alkaline clean water, and must not contain corrosive compounds, and the cooling medium should develop from the cooling water to the direction of the coolant. Clean soft water should be used in the cooling system, and the pH value of the cooling water should be controlled between 8 and 11 to minimize the fouling and blockage in the cooling system to prevent affecting the cooling effect.

In use, the inside of the cooling system should be cleaned regularly with chemical agents to ensure good cooling cycle and normal heat dissipation.

Hello, Suntech diesel generator set engineer reminds that the working water temperature of diesel generator set is between 80-90 degrees.

1. Overloading work for a long time will cause an increase in fuel consumption, an increase in internal heat dissipation, and a boiling of cooling water. (Yanan Motor answers).

Solution: The best way to deal with this situation is to avoid overloading it for long periods of time.

2. It is very important whether the amount of liquid inside the mechanical equipment meets the standard, usually if the amount of liquid is insufficient, especially the insufficient coolant, it will reduce the heat dissipation effect of the equipment, so that the diesel engine will overheat.

Solution: For the high temperature caused by this situation, as long as the inspection work is mainly done in the daily use process, the insufficient amount of liquid can be replenished in time.

3. Whether the heat dissipation of the mechanical equipment is good, whether the cleanliness of the surface is good, whether the cooling fan is good, and whether the heat dissipation effect is good may cause the high temperature failure of the diesel engine.

Solution: In order to prevent this from happening, we only need to do a good job of inspection in daily use, so that we can find some abnormal situations in time and repair or replace them.

Because the environmental conditions have a great impact on the operation of diesel generator sets, there are a series of standards for environmental requirements. The calibrated power of diesel generator sets is for a specific environmental condition, which refers to the ambient atmospheric pressure, frustration and relative humidity of the diesel generator set operation site, which has a great impact on the performance and working efficiency of the diesel generator.

When the ambient atmospheric pressure decreases, the temperature rises, and the relative humidity increases, the dry air drawn into the cylinder of the diesel engine decreases, and the power of the diesel engine decreases. Conversely, the power of the diesel engine will increase. Then when the ambient temperature is too low, when the temperature of the cooling water of the water tank is too low, the temperature of the lubricating oil decreases, the viscosity of the oil is greater when the temperature is low, and its fluidity becomes poor, which not only increases the wear of the parts of the diesel generator set, but also increases the mechanical power loss due to the increase of the movement resistance of the parts, and the output power of the diesel generator set will be reduced.

2) If the ambient temperature is too low, the temperature of the cylinder will be very low, and the water vapor in the cylinder will easily condense on the cylinder wall, and the sulfur dioxide generated by the diesel generator when it burns will become a strong corrosive agent and adhere to the cylinder wall when it encounters the water condensed on the cylinder wall, so the surface of the cylinder wall will be strongly corroded, resulting in the loosening of the metal structure on the surface; When the cylinder liner and the piston ring rub and scrape with each other, the loose metal on the surface of the corrosion layer will quickly wear off, or etch spots and pits appear on the working surface of the cylinder liner.

3) Heat loss increases, fuel consumption increases.

When the diesel generator set works at low temperature, the cooling water takes away a large amount of heat energy in the cylinder, which increases its heat loss; If the mixture is not well formed and burned, the fuel consumption will increase by 8% to 10%; When the droplet fuel enters the cylinder, it flushes the oil film on the cylinder wall and penetrates into the crankcase, increasing the wear of the parts, diluting the oil in the oil pan, increasing fuel consumption and reducing power output.

4) Combustion deteriorates, and the performance of the whole machine deteriorates.

Some parts that are thermally expanded do not expand to their proper size due to too low temperature, which affects the working performance of the whole machine, such as the gap between the piston and the cylinder.

Too big, not well sealed; The valve clearance is too large and is subject to rocker arm impact, etc., and makes it difficult for diesel generators to start. When the temperature of cylinders, pistons and other parts decreases, it will cause the temperature drop at the end of compression, the delay of ignition and the deterioration of combustion conditions, resulting in incomplete fuel combustion, rough working of diesel generators and exhaust smoke.

No matter what brand, imported or domestic diesel generator sets, their operation will be affected by the working environment. Among them, the three environmental factors of altitude, temperature and humidity have a particularly obvious impact on diesel generator sets

1. Altitude. The general altitude of diesel generator set is not higher than 1000 meters. For every 100 meters of altitude gain, the output of the diesel generator set decreases by 5%.

Because the higher the altitude, the lower the local air pressure, the thinner the air, and the small oxygen content, which will lead to the poor combustion conditions of the unit due to insufficient air intake.

2. Ambient temperature. The normal ambient temperature of the diesel generator set is minus 15 degrees to minus 40 degrees, and other protective functions should be installed on the diesel generator set below or above this temperature, such as auxiliary starting measures corresponding to the low temperature start should be taken at low temperature.

3. Air humidity. The humidity of the air also has an impact on the diesel generator set, if the unit is used in a relatively high air humidity environment for a long time, it will cause great damage to the generator set, or even unusable.

Based on the above, when using diesel generator sets, we must fully consider the impact of environmental factors on them, try to avoid using the unit in high altitude, ultra-low or ultra-high temperature and high humidity environment, if it is to be used under harsh conditions, we must install corresponding protective measures to protect the normal operation of the unit.

The actual operation of the diesel generator set will be affected by the environment, and the altitude and other factors such as the temperature and heat, and the size of the air pressure will interfere with the operation of the unit. What we will introduce to you is the influence of ambient temperature on the power of the generator set.

According to the international technical requirements, the ambient temperature of the generator is generally defined as 40 degrees Celsius, and all designs and powers are based on this ambient temperature.

In fact, for generators, the ambient temperature should be the inlet air temperature of the generator. Since the generator works with the diesel engine, the heating of the diesel engine will cause the temperature in the entire space to exceed 40 degrees Celsius.

It is very important that the ambient temperature of the generator should not exceed 40 degrees Celsius during actual operation. If the actual ambient temperature exceeds 40 degrees Celsius, then the generator should be operated at reduced power.

For ambient temperatures, if it is below 40 degrees Celsius, the power of the generator can be higher than the rated power.

When the ambient temperature exceeds 40 degrees Celsius, the power correction factor of the generator:

Ambient temperature (degrees Celsius) factor.

Some technicians like to adjust the outlet water temperature very low when operating the diesel generator set, they think that the water temperature is low, there will be no cavitation in the water pump, the cooling water (liquid) will not be interrupted, and there is an insurance factor in use. In fact, as long as the water temperature does not exceed 95, cavitation will not occur, and the cooling water (liquid) will not be interrupted. On the contrary, if the water temperature is too low, it is extremely harmful to the work of the diesel engine.

It is believed that the water temperature is too low, which will mainly bring the following three harms.

First, the temperature is low, the diesel combustion conditions in the cylinder deteriorate, the combustion period increases after ignition, the engine work is easy to be rough, aggravate the damage of crankshaft bearings, piston rings and other parts, reduce power and reduce economy.

Second, the water vapor after combustion is easy to condense on the cylinder wall, causing metal corrosion.

The third is that the diesel fuel that comes to burn may dilute the engine oil and make the lubrication worse. Fourth, the fuel combustion is incomplete and the formation of gum, so that the piston ring is stuck in the piston ring groove, the valve is stuck, and the pressure in the cylinder is reduced at the end of compression. Fifth, the water temperature is too low, the oil temperature is also low, the oil becomes thicker, the fluidity becomes poor, so that the oil supply is insufficient, and the crankshaft bearing clearance becomes smaller, and the lubrication is poor.

So, what is the water temperature of the diesel generator set?

In winter, the temperature is low, the ambient temperature of the diesel generator set is also low, and the temperature of the coolant will also be low. Therefore, the temperature rise of the coolant of the diesel generator set will be slower, and the temperature of the coolant should be about 80° when the diesel engine exerts the maximum effective power. When using diesel generator sets in winter, the water temperature should be guaranteed to be about 80° when preparing to transmit power to run the load.

Summer temperatures are higher, and this summer has been even more unusual. Some of the high temperatures reach. The coolant of diesel generator sets rises quickly in such a hot season.

Diesel engines are prone to cylinder pulling accidents at 100° water temperatures, so diesel generator sets should stop working or reduce load when the coolant exceeds about 95°.