METHOD AND SYSTEM FOR PURIFYING A PRODUCT GAS FORMED FROM BIOMASS

摘要

A method for purifying a combustible gas that is contaminated with contaminants, such as tar and/or dust particles, comprises feeding oil to the contaminated gas. The oil evaporates through contact with the contaminated gas. Said evaporated oil is condensed on a quantity of the contaminants in such a manner that said contaminants grow in size to form particles of increased size in the gas. An electric field between electrodes is applied, by means of which said particles of increased size are electrically charged and removed from the gas. The condensation of the oil takes place at a temperature above the water dew point of the contaminated gas. This water dew point is preferably between 50-100 °C, in particular between 50-80 °C.