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What are the common problems of diesel generators?

What are the common problems of diesel generators?

Diesel generators have become a must in many fields. Therefore, many customers want to know how much diesel generators cost to generate electricity. Is it cost-effective to rely on diesel generators to generate electricity?

Diesel generators are fuel-efficient, have high thermal efficiency, and when the working conditions change, the fuel consumption rate curve changes relatively flatly, and it is also economical under low load.

One liter of diesel concept heat (kg standard coal) 1.3515; 1 kWh of electricity concept heat (kg standard coal) 0.1229; diesel generator set power energy conversion efficiency 30-40%;

One liter of diesel power generation capacity (kWh) 3.3-4.4; one liter of diesel average selling price (RMB) 6.44; diesel generator fuel production cost (RMB/kWh) 1.5-2.0; national average commercial electricity production cost (RMB/kWh) ) 0.74

Through the above analysis, you should be able to have a general understanding. Let’s talk about the conversion method of diesel power generation: under normal circumstances, the conversion efficiency of diesel generator set power generation is about 31%, and the weight of 1 liter of diesel is about 0.835 kg.

Diesel 1 kg of diesel heat = 10200 kcal/kg = 10200*1000*4.184J=42676800 joules,

0.835 kg of diesel calorific value = 0.835*42676800 joules, 1 kWh of electricity = 1000W*1H = 3600000 joules, 35635128 joules ÷ 3600000 joules = 9.89 (kWh of electricity) Counting the conversion rate of diesel generator sets, about 1 liter of diesel can generate 3.065 kWh of electricity.

Diesel generator sets have a wide range of power, and different brands of diesel generator sets have different fuel-saving conditions.

Diesel generator sets are more and more widely found in factories, communities, construction sites and other fields that require emergency power supply. In order to enable diesel generator sets to operate normally and efficiently, their heated parts must be properly cooled to make them work normally. Efficient operation within the temperature range, the water tank of the diesel generator set is an important component of the heat dissipation circuit of the water-cooled engine, which can absorb the heat of the cylinder block and prevent the unit from overheating and causing failure.

Due to the large specific heat capacity of water, the temperature rise after absorbing the heat of the cylinder block is not much, so the heat of the engine passes through the liquid circuit of cooling water, uses water as a heat carrier to conduct heat, and then passes through a large area of radiating fins for convection. way to dissipate heat to maintain the proper working temperature of the diesel generator set engine.

When the water temperature of the diesel generator set engine is high, the water pump pumps the water repeatedly to reduce the temperature of the engine. Wall) to achieve the purpose of protecting the engine, if the water temperature is too low in winter, the water circulation will be stopped at this time to prevent the engine temperature of the diesel generator set from being too low.

The water tank of the diesel generator set plays a very important role in the entire generator set body. If the water tank is used improperly, it will cause damage to the diesel engine and generator, and even cause the diesel engine to be scrapped in severe cases. Therefore, users must learn how to use generators’ water tank.

Mechanical equipment has a useful life, and diesel generator sets are no exception. So what is the scrap standard for diesel generator sets? Let’s briefly introduce the circumstances under which diesel generator sets can be scrapped.

The old generator set equipment that has exceeded the specified service life, the structure and parts of the diesel generator set are seriously worn, the equipment performance does not meet the requirements, and the generator set cannot be repaired or has no value for repair and transformation.

Diesel generator sets that cannot be repaired for equipment that has been severely damaged due to accidental disasters or major accidents.

It will seriously affect the environmental protection and safety. Continued use will pollute the environment, cause personal safety accidents and Weihai health, and it is uneconomical to repair and transform the generator set.

It is not advisable to modify the generator set used for special equipment that is eliminated due to product model change and process change.

The generator set that cannot be used or transferred out of the old equipment replaced by technical transformation and update.

In the above five situations, we can apply for the scrapping of the diesel generator set. The general service life of diesel generator sets is: the service life of domestic diesel generator sets is 10,000 hours or 10 years; the service life of imported diesel generator sets is 12,000 hours or 12 years.

Diesel generator set oil supply and exhaust gas method.

If you don’t have the wrench to loosen the joint in the pipeline, you can press the hand pump repeatedly until the pressure of the low-pressure oil circuit from the fuel pump to the fuel injection pump is high enough, and the fuel flows from the relief valve into the fuel return pipeline. The gas will be discharged from the overflow valve.

If the trailer generator does not have a suitable screwdriver or wrench to open the bleed screw on the fuel injection pump during driving, you can unscrew the hand fuel pump first, then loosen any pipe joint from the diesel filter to the fuel injection pump, and then Press the hand oil pump repeatedly to discharge a smooth and bubble-free oil flow from the joint, then tighten the joint while pressing the hand oil pump, and then press the hand oil pump back to its original position.

Use a screwdriver or wrench to unscrew any exhaust screw on the upper end of the fuel injection pump for several turns, and press the manual fuel pump by hand until the diesel discharged is continuous, smooth and without bubbles, and a “squeak” sound is heard. Then tighten the bleed screw, and manually press the oil pump back to its original position.

If you need to remove the air in the oil circuit on the way, you can first loosen the bleed screw on the fuel injection pump or loosen any joint between the diesel filter and the fuel injection pump, and then drive the mechanical fuel pump by starting. This leak point will spray out smooth and bubble-free fuel, and then you can tighten the above leak point you loosened.

How to maintain the water tank radiator of diesel generator set?

When the diesel generator set is working, the pressure cover should be closed to avoid hindering the normal operation of the cooling system. It is necessary to check the coolant level in the radiator of the water tank frequently and replenish the coolant in time. If the coolant level is too low, the cooling effect of the system will be affected. , aggravate diesel engine cavitation, but need to be careful to prevent the steam from hurting people. So how to maintain the water tank radiator of the diesel generator set?

The water tank radiator needs frequent maintenance to ensure the heat exchange between the coolant and the air. Under normal circumstances, the exterior and interior of the radiator of the water tank should be cleaned every 500 hours of operation of the diesel engine. To clean the internal scale and precipitated impurities, first drain the water in the radiator, and then use clean water with a certain pressure (such as tap water) to pass into the radiator core until the water flowing out is clean.

After the water tank radiator has been used for a period of time, if there is a leak, it can be repaired with solder. When individual pipes are seriously damaged and cannot be repaired, the pipes are allowed to be blocked, but the number of blocked pipes cannot be more than three, otherwise the outlet water temperature of the diesel engine may exceed the allowable range.

The pressure cover set on the water inlet of the radiator of the water tank can increase the pressure of the system to a certain range, which not only increases the boiling point of the coolant, so that the system can work normally at a higher temperature and a certain altitude, and also improves the Resistance to cavitation of diesel engines and water pumps. There is a steam valve and an air valve in the pressure cover. When the positive pressure or negative pressure in the radiator of the water tank exceeds the specified value, the valve set in the pressure cover will automatically open to achieve the purpose of steam discharge or air entry.

What will happen if the water in the diesel generator water tank boils dry?

The role of the water tank of the diesel generator set We all know that the main role is to reduce the water temperature. If the water temperature cannot be lowered for a long time, the diesel generator will be considered bad.

The water tank of the diesel generator set is an important part of the water-cooled engine. As an important component of the cooling circuit of the water-cooled engine, it can absorb the heat of the cylinder block and prevent the engine from overheating.

Due to the large specific heat capacity of water, the temperature rise after absorbing the heat of the cylinder block is not much, so the heat of the engine passes through the liquid circuit of cooling water, uses water as a heat carrier to conduct heat, and then passes through a large area of radiating fins for convection. way to dissipate heat to maintain the proper working temperature of the diesel generator set engine.

When the water temperature of the diesel generator set engine is high, the water pump is repeatedly circulated to reduce the temperature of the engine. ) To achieve the purpose of protecting the engine, if the water temperature is too low in winter, the water circulation will be stopped at this time to prevent the engine temperature of the diesel generator set from being too low.

The purpose of the water tank is to cool the engine in operation. The lack of water in the water tank will cause the water temperature to rise, the vehicle water temperature will be alarmed, the engine heat dissipation is poor, and the expansion of components will reduce the fitting clearance of each component. On the other hand, if the temperature is too high, the viscosity of the oil will decrease. , in this case, the wear of each component is increased. If proper treatment is not taken immediately, the engine is likely to burn and cause serious engine damage.

If it burns out, it’s leaking water, or a faulty engine head gasket has caused water to enter the cylinder block. At this time, stop immediately to cool down, remember not to turn off the engine, let the car cool down slowly, and prevent the cylinder from rising.

What are the main pollutants emitted by diesel generators?

The types of diesel engine emissions can be divided into two categories: harmful emissions and harmless emissions according to their harm to human beings. Hazardous emissions, also known as emission pollutants, mainly come from exhaust emissions (commonly known as tail gas), with a small amount from crankcase emissions and fuel evaporative emissions. Exhaust emissions are harmful substances emitted from the exhaust pipe of a diesel engine.

The diesel used in diesel engines is high molecular hydrocarbons. When it is completely burned in the combustion chamber, it will only produce carbon dioxide (C02) and water vapor (1-120), plus excess oxygen (02) and residual nitrogen ()D etc. These components are the products of the complete combustion of fuel oil and air, and from a toxicological point of view, these components in the exhaust gas are harmless (CO2 was not considered a pollutant in the past, but with the With extensive use, the volume fraction of CO2 in the atmosphere has increased from 280 × 10-6 at the beginning of the industrial age to about 340 × 10-6 now, causing the greenhouse effect and attracting the attention of all mankind). In addition to the above-mentioned basic components, there are also incomplete combustion products and intermediate products of combustion reaction in diesel engine exhaust, mainly including carbon monoxide (CO), hydrocarbon () O, sulfur dioxide (SOD, NOX and PM, etc.) The proportion of the total mass in the exhaust emissions of diesel engines is not large, less than 1%, but most of them are harmful, or have a strong irritating odor, and some are carcinogenic and mutagenic (mutagenic). ) and is therefore classified as a hazardous discharge.