In the earth's womb in the composition of gases, there is sometimes hydrogen sulphide - a substance without color and with a sharp, suffocating smell. Hydrogen sulphide is an active substance with a strong corrosion effect. Its removal from the natural gas composition takes place in the purification plants.

Before passing through the gas pipelines, natural gas is also subjected to drying to remove the accompanying quantities of water. Drying takes place in installations where the gas is treated with diethylene glycol.

Since natural gas is colorless and odorless in order to detect its leakage, it is odorized before it is fed into the distribution networks. After purification and drying, 16 g of ethyl mercaptan per 1000 m3 of gas are added.

Gaseous fuel combustion is a process of quickly combining its combustible elements with oxygen. This process proceeds in certain quantitative ratios, which are expressed by the equations for the oxidation reaction.

Burning can begin if the air mixture is heated to a specific temperature called a flash point.

The starting burning process of the gas mixture is maintained independently if the amount of heat released by the combustion is sufficient to heat the new fuel to a flashpoint.

If the gas in the mixture is insufficient or the supply air is too much, the heat released by the combustion is not reached and the combustion is stopped.

The smallest and largest volumes of gas content in the gas mixture, within which a flash or explosion may occur, are called the lower and upper limits of explosion.