Combustion plants (e.g. in relation to industrial heat production, district heating or electricity generation, not forgetting the propulsion of ships) are based on the use of fuels such as natural gas, liquefied petroleum gas, biomethane, heating fuel, coal, heavy fuel oil, biomass or biogas.

Some combustion products released to the atmosphere are undesirable and their rate must be restricted (by exhaust gas clean-up), in relation to the environmental and ecological concern for which sensitivity seems to be - and it is fortunate for those concerned with the sustainability of life, not just human, on the planet - growing, at least in Western Europe.

In many countries in the world, and for a long time, limits of emission of atmospheric pollutants exist, the non-respect of which leads to the impossibility of putting into operation installations e.g. of stationary engines for power generation or the prohibition to penetrate in some territorial waters for boats.

A decree is limiting the emissions of polluants into air.

In France, Decree No. 2018-704 of August 3, 2018 amending the nomenclature of Establishments Classified for Environmental Protection (ECEP) and some provisions of the Environment Code (e.g. the contents of the application document package for authorization and registration) transposes into French law (EU) Directive No 2015/2193 of 25 November 2015 on the limitation of emissions of certain pollutants into the air from Medium Combustion Plants (MCP).

The following are concerned: new installations with a capacity of more than 1 megawatt (MW) from 20 December 2018, existing installations with a capacity of more than 5 MW from 1 January 2025 and existing installations with a power between 1 and 5 MW from January 1, 2030.

Emission limit values (in mg/Nm3) are now fixed, in relation with Table 2 of Annex II of the Directive, for new engines and gas turbines, depending on the fuel (liquid: diesel fuel or other or gaseous: natural gas or other) for different pollutants: sulfur dioxide (SO2), nitrogen oxides Nox, and dust.

Combined or not with silencers designed to reduce noise, Selective Catalytic Reduction SCR devices (catalytic converters) marketed by ITS are able to limit the air pollutants contained in the exhaust gases of heat engines, to prevent the pollution of air.

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Selective Catalytic Reduction Device SCR - catalytic converter

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