Difference between liquefied and compressed gas.

Gas that is extracted from the bowels of the earth or is a product of the processing of other hydrocarbons may subsequently be used in liquefied or compressed form. What are the special features of both applications of the respective fuel?

What is LPG?

Under liquefied it is customary to understand natural gas, which is converted from the initial, proper gaseous state into a liquid - by means of cooling to a very low temperature, of the order of minus 163 degrees Celsius. In this case, the volume of fuel is reduced by about 600 times.

The carriage of liquefied gas requires the use of special cryogenic tanks that are capable of maintaining the required temperature of the relevant substance. The advantage of this type of fuel is the ability to deliver it to those places where it is problematic to conduct conventional gas pipelines.

Converting liquefied gas to its original state also requires special infrastructure - regasification terminals. The processing cycle of the considered type of fuel - production, liquefaction, transportation and regasification - significantly increases the final cost of gas for the consumer.

The fuel in question is usually used for the same purposes as natural gas in its original state - for heating premises, ensuring the operation of industrial equipment, power plants, as a raw material in some segments of the chemical industry.

What is CNG?

Under compressed, or compressed, it is customary to understand natural gas, which, like liquefied, is also presented in a liquid state, which is achieved, however, not due to a decrease in temperature fuel, but by increasing the pressure in the container in which it is located. The volume of compressed gas is about 200 times less than that of the fuel in its original state.

Converting natural gas to liquid using high pressure is generally cheaper than liquefying fuel by lowering its temperature. The transportation of this type of gas is carried out in containers, as a rule, less technologically complex than cryo-tanks. Regasification of the appropriate type of fuel is not required: since it is under high pressure, it can be easily removed from the tanks - just opening the valves on them. Therefore, the cost of compressed gas for the consumer in most cases is lower than that of liquefied fuel.

Compressed gas is most often used in the form of fuel in various vehicles - cars, locomotives, ships, in gas turbine engines of aircraft.

Comparison

The main difference between liquefied and compressed gas is that the first type of fuel is obtained by lowering the temperature of the initial gaseous substance, which is accompanied by its transformation into a liquid. Compressed gas is also a liquid fuel, but it is obtained by placing it in a container under high pressure. In the first case, the initial volume of gas exceeds the processed (converted into liquid) by about 600 times, in the second - by 200 times.

It should be noted that liquefied gas is most often obtained by processing "classic" natural gas, represented mainly by methane. Compressed fuels are also made from many other naturally occurring gases, such as propane or butane.

Having determined what is the difference between liquefied and compressed gas, we reflect the conclusions in the table.

Table

Liquefied gas Compressed gas
What do they have in common?
To obtain both types of fuel, the same raw material is used - natural gas (for the production of liquefied gas, methane is most often used, for the release of compressed gas - also propane, butane and other gases)
What is the difference between them?
It is obtained by lowering the temperature of the source fuel - natural gasIt is obtained by increasing the pressure in the container in which the source natural gas is located
For storage and movement requires the use of high-tech cryocisternsFor storage and movement requires the use of relatively less technologically advanced sealed containers
The volume of the initial fuel is about 600 times more than converted to liquefied gasThe volume of the initial fuel is about 200 times larger than converted to compressed gas
Usually used for the same purposes, as usual natural gas - for heating premises, ensuring the operation of industrial equipment, power plantsIt is used, as a rule, as fuel for vehicles
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