Diesel Generator vs. Natural Gas Generator

Diesel Generator vs. Natural Gas Generator

Diesel generator sets are internal combustion engine as the driving force of small power generation equipment, in the case of power shortages, diesel generator sets are particularly important, diesel generator sets as a self-contained power station AC emergency power supply equipment have been more and more widely used in major fields.

Natural gas generator sets are ignition-type gas machines fuelled by high calorific value gas such as natural gas. The supercharging system and intercooler system are added based on non-supercharged models, and the cooling system adopts separate high and low-temperature circulations, with the high-temperature circulation cooling the high-temperature parts such as cylinder, body and cylinder head, and the low-temperature circulation cooling the supercharged gas and air as well as the oil cooler.

Difference Between Natural Gas Generator & Diesel Generator

1. Due to the use of different fuels, natural gas generators compared to diesel generator sets, low safety performance, and high fuel consumption.

2. Fuel: In terms of fuel type, diesel generator sets use diesel as fuel, while gas generator sets use gas as fuel. Diesel fuel is a common fuel, through the combustion of diesel fuel to produce heat energy, which is converted into electricity. Gas, on the other hand, is a clean, efficient energy source, through the combustion of gas to produce heat energy, which is then converted into electricity. Diesel generator sets use petroleum-based fuels, while gas generator sets use natural gas as fuel.

In contrast, natural gas is a cleaner source of energy, and the emissions from combustion are more environmentally friendly. In addition, natural gas reserves are more abundant and stable.

3. Ignition: Gas gensets run on compression ignition (CI), while diesel gensets run on spark ignition (SI). The two ignition systems are different, the gas generator engine is larger, has rapid switching, the voltage rises fast, ignition success rate than the diesel generator is a little higher.

4. Cylinder pressurized material: gas generator sets are pressurized with air and atomized natural gas in the cylinder, while diesel generator sets are pressurized with air and atomized diesel fuel in the cylinder.

5. Scope of application: gas generator sets are mainly used for industrial units dedicated to power generation, while diesel generator sets are mainly used for general household use or small shop power generation.

6. Safety performance: Due to the safety performance of the fuel, diesel generator sets have higher safety performance and lower fuel consumption, while gas generator sets have lower safety performance and higher fuel consumption.

7. Volume and weight: In general, the volume and weight of diesel generator sets are much larger than gas generator sets.

8. Power range: the power range of diesel generator sets is much larger than gas generator sets, the general maximum power of diesel generator sets is up to 2000KW, while the maximum power of gas generators is only about 800KW.

You can choose different equipment according to your own needs.

Support For Customisation Diesel Generator

People who purchase generators do not know whether a petrol generator is good or a diesel generator is good and tangled, but after reading this article will not need to be tangled.

Petrol Generator VS. Diesel Generator

1. The cylinder-compressed material is different:

The petrol engine in the compression stroke stage is a mixture of gasoline and air compression;

Diesel engine in the compression stroke stage is the compression of air. (What is A Diesel Generator Set? | Working Principle)

2. Ignition mode is different:

Petrol engine relies on spark plug ignition;

Diesel engines rely on atomized diesel fuel sprayed to high-pressure gas self-ignition.

3. The mixing of fuel and air:

In the petrol engine, fuel and air are mixed in the carburetor and intake piping.

In the diesel engine, diesel and air mixing is in the diesel fuel is injected into the cylinder after;

4. The scope of application:

Petrol generator is mainly a general family generator;

Diesel generators are mainly special generators for construction units.

5. The difference between the sound and volume:

Petrol generator than diesel generator noise is smaller, petrol generator than diesel generator volume is smaller;

6. Fuel consumption and working hours:

Petrol generator than diesel generator fuel consumption is higher, in 24 hours of continuous work time, petrol generator daily continuous work time than diesel generator continuous work time is less;

Of course, the biggest difference between the two is the ignition device and the fuel system is different. The diesel generator is a compression-ignition internal combustion engine, which uses an injection pump and a number of injectors; while the petrol generator has a carburetor, a distributor, and a number of spark plugs.

In general, petrol generators, generally speaking, are for domestic use, disaster relief and emergency response, etc., while diesel generators think of large-scale construction, so most of the internal parts of the diesel generator the petrol generators are stronger and heavier, this is due to the diesel generator to withstand the machine to withstand the greater pressure.

Internal structure:

1. The two use different pistons, diesel generators use a W-type piston, and gas generators use a basin-type structure piston, which can reduce the compression ratio.

2. The two superchargers are different, gas generators use a double supercharger, belonging to the variable pressure system.

The supercharger pressure wheel is smaller than the gas generator.

3. The two phone systems are different, the gas generator engine is larger, the switch quickly voltage rises fast, ignition success rate than diesel generators is higher.

4. The two camshafts are different, the diesel generator valve overlap angle is larger, the guide gas is more adequate, the gas generator set valve overlap angle is smaller, and can not sweep the gas in a large area, only through the piston will be pushed out, so the exhaust temperature is higher.

Diesel Generator Efficiency

The efficiency of a diesel generator is the ratio of effective energy converted from fuel to fuel energy per unit of time for a diesel generator.

The efficiency of a diesel generator is affected by three main factors.

  1. Fuel type: different fuel types have different calorific value, which affects the efficiency of the generator.
  2. Power: the greater the power of the generator, the more fuel it needs to consume, thus reducing efficiency.
  3. Operating conditions: factors such as temperature, pressure, humidity, etc. can affect the efficiency of the generator.

Under normal circumstances, the efficiency of the diesel generator is generally between 25% -35%, of course, can also be installed through the addition of high-efficiency diesel generators to improve efficiency

Gas Generator Efficiency

The power generation efficiency of a gas turbine generator is the percentage of the chemical energy of the fuel that it is able to convert into electrical energy.

Generation efficiency is usually expressed as a percentage and can be calculated using the following formula:


Generation Efficiency = Generation Power / Fuel Consumption Power × 100%


Among them, power generation power refers to the actual electrical power output of the gas turbine generator, and fuel consumption power refers to the heat energy produced by fuel combustion.

There are many factors affecting the power generation efficiency of a gas turbine generator, including the calorific value of the fuel, combustion efficiency, compression ratio, intake temperature, etc. The higher the calorific value of the fuel, the more the gas turbine generator will generate power. The higher the calorific value of the fuel, the higher the power generation efficiency of the gas turbine generator.

Combustion efficiency refers to the ratio of the heat energy released by the fuel in the combustion process to the heat energy contained in the fuel itself, and the higher the combustion efficiency, the higher the power generation efficiency. Compression ratio refers to the ratio of the highest pressure to the lowest pressure of the gas in the compression process, the higher the compression ratio, the higher the power generation efficiency.

An increase in intake gas temperature can improve the power generation efficiency of a gas turbine generator because the heat energy of the high temperature gas is more adequate.

In the third generation of Kotech’s KGS series silent generator sets, the design is perfect

  1. The whole series of silent diesel generator sets can be lifted on the top of the box.
  2. The overall structure is more compact, with built-in large horizontal silencers, and lower noise; silent diesel generator sets
  3. Cancellation of the traditional design of the bottom of the box into the wind, to prevent debris and dust inhalation, and increase the area of air intake and exhaust.
  4. Independent output switch box on the static speaker box, to facilitate the connection of the cable (especially suitable for construction, and leasing); Silent diesel generator sets
  5. The static speaker box is waterproof and the weatherproof grade is higher.

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Generator Applications

1. Gas generator sets are generally used for constant load, while diesel units are usually emergency or standby power.

2. Gas units of rich gas sources, coal bed methane natural gas biogas, etc. can be used as a gas source, while the diesel generator set can only use diesel as fuel.

3. The comprehensive benefits of gas units (power generation value – maintenance costs) over diesel units, gas than diesel oil economy.

Energy efficiency: Gas generator sets have a higher energy efficiency. This is mainly because gas is a high-density energy, energy per unit volume is higher than diesel, so the gas genset has a higher energy use efficiency. In addition, gas gensets also have lower operating costs and lower emissions, so they are widely used in many areas.

Operation and maintenance: diesel generator sets and gas generator sets also have certain differences. Diesel generator set maintenance is relatively simple, and mainly involved in regular oil changes, cleaning air filters and other routine maintenance work.

Emissions: Diesel generator sets emissions are relatively high, and will produce a lot of exhaust and noise pollution.

The gas genset emissions are relatively low, producing less exhaust and noise pollution, so more environmentally friendly.

Diesel generator sets, on the other hand, because the combustion of the exhaust gas contains a large number of harmful substances, such as particulate matter and nitrogen oxides, the environment is more polluted.

Therefore, diesel generator sets need to configure exhaust gas treatment equipment to purify the exhaust gas, increasing the cost and complexity.

Cost: The cost of gas generator sets is relatively low compared to diesel generator sets, because the price of gas is more stable, and sufficient reserves, will not be affected by market fluctuations like petroleum-based fuels.

At the same time, the maintenance cost of gas generator sets is also lower, because of the simple structure of the gas engine, and the service life is longer.

Applicable scenes: Diesel generator sets are usually suitable for some temporary or emergency lighting, power transmission and other power supply, such as open-pit mining, and construction sites.

Gas generator sets are more suitable for long-term continuous power demand, such as factories, commercial complexes and other places.

Naturl Gas & Diesel generator Advantages

Naturl Gas generator:

1. Good quality of power generation

As the generator set works only in rotary motion, ESC response speed works especially smoothly, The generator set output voltage and frequency of high precision, fluctuations are small, in the sudden plus air minus 50 percent and 75 percent of the load, the unit set armpit into a camel line is very stable.

Better than the diesel generator set electrical performance indicators.

2. Good starting performance, high start-up success rate

From cold start after the success of the full load time is only 30 seconds, while the international regulations of the diesel generator start after the success of 3 minutes with the load, the gas turbine generator set can be any ambient temperature and climate to ensure the success rate of the start.

3. Low noise and vibration

As the combustion turbine is in high-speed rotation, it has very small vibration, and low-frequency noise is better than diesel generator sets.

Diesel generator:

1. High thermal efficiency

High thermal efficiency, that is, low fuel consumption rate, good economy, especially the diesel engine, it is the highest thermal efficiency of the heat engine, the highest effective thermal efficiency up to has reached 46%.

2. Wide range of power

Stand-alone power can be from zero to several tens of thousands of kilowatts, a wide range of applications.

3. Compact structure, lightweight, internal combustion engine mass and its calibrated power ratio (known as the ratio of mass) are small and easy to move.

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