Combustion process for the reduction of particulates in combustion fumes

摘要

A combustion process wherein a fuel, a comburent and component A) are fed to a combustor, component A), comprising low-melting salts and/or oxides having a melting temperature ≦1,450 K, the ratio by moles A′/(A″−A′)≧0.01, being: A′ the sum by moles between the amount of metals, under the form of low-melting salts and/or low-melting oxides present in the component A) and the amount of metals under the form of the low-melting salts and/or low-melting oxides or their low-melting mixtures, contained in the fuel, A″ is the sum of the amount of all the metals contained in the fuel and of those contained in component A), in which the combustor is isothermal type and flameless.

主权项

1. A combustion process for removing particle size diameter lower than 2.5 μm (PM 2.5) to values lower than 50 μm/Nm3 from combustion fumes wherein a fuel, a comburent, optionally premixed with recycling fumes, and component A) are fed to a combustor, component A) comprising low-melting salts and/or oxides and/or mixtures thereof having a melting temperature, comprising a melting point <1,450 K, the ratio by moles A′/(A″−A′) is >0.01, being:
A′ the sum by moles between an amount of metals, under the form of low-melting salts and/or oxides and/or mixtures thereof present in the component A) and an amount of metals under the form of the low-melting salts and/or oxides or mixtures thereof contained in the fuel, A″ is the sum of the amount of all the metals contained in the fuel and of those contained in component A), in which the combustor is isothermal type and flameless, wherein the comburent is oxygen and is used in molar excess with respect to a stoichiometric amount for combustion reaction with the fuel, wherein the titre of oxygen is at least 70% by volume, the complement to 100% being formed of inert gases and/or nitrogen; wherein metals present in the fuel and in component A) remain under a liquid state in the combustor and are removed from a bottom of the combustor; and wherein the pressure in the combustor is higher than the atmospheric pressure and up to 2,000 kPa and the temperature is comprised between 1,500 K (1,223° C.) and up to 2,100 K (1,827° C.).