Exhaust Gas Dispersal
The exhaust gases from a CHP plant can cause a nuisance within the local environment if the installation is not correctly designed and operated. The UK National Air Quality Strategy has set limits for airborne pollutant concentrations in the general environment where people are exposed to them, and these must be respected. Other legislation relating to use of gas-fired equipment also sets standards for the design of exhaust systems.
Adequate pollutant dispersion can be achieved by ensuring that discharge of the exhaust occurs at a sufficient height above the surrounding area. The required height for an exhaust system, or a chimney, depends on a wide range of factors, including the composition of the exhaust and its temperature and velocity, and the quality of the background air. The supplier of the CHP package should have the necessary knowledge to design a system that meets local requirements, and may sometimes work in conjunction with the local authority.
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