Gas cleaning and cooling for gasifier system is accomplished by a cyclone, a gas cooler with some scrubbing action and a packed bed filter. Gas cooling increases density of gas in order to maximize the amount of gas entering the engine cylinder. Wet scrubbers are used to remove gaseous pollutants and solid particles while cooling the gas at same time. There exist different kinds of scrubbers for small scale producer engine system. A Packing bed scrubber consists of packing, liquid, support grates and distributors plates. Packing can be made from wide range of commercial and home made materials-steel, wool, wood chips, coke, gravel etc. Gas is passed through bottom and removed at top.Fabric filter is considered to be one of the suitable filters for vehicle application. It is placed immediately after cyclone. In filter with glass-fiber cloth, it is possible to withstand a gas temperature up to 300 C. The performance of filter depends on type of gasifier, fuel moisture content and how vehicle is driven. It is recommended that gas flow rate through the filter box shall not exceed 65 m3/h. Pressure loss over filter is affected by load and amount of dust in the producer gas.
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