An undesired effect of this, has been the increase in the content of chlorine and its compounds in flue gases.
In order to ensure the abatement of these substances, a specific bypass system is installed that typically extracts up to 10-15% of the gas flow rate in the first few metres of the riser, the area where the highest concentration of these compounds in gaseous form and a temperature in the range of approximately 950 to 1100°C occur.
This gas stream is rapidly cooled with air in a mixing chamber, from which the gases exit at around 400°C, with the condensation and solidification of the chlorine compounds, which will be captured in the filtration state that follows.
Area Impianti is already well established in this application with both ceramic candle filters (which can be directly crossed by gases at 400°C) and bag filters (which require subsequent cooling to around 200°C of the gases exiting the mixing chamber).
The choice of the filter technology to be used will be discussed with the customer with a view to energy optimisation and integration of the chlorine bypass into the entire cement production plant.