Investigation of technical and technological parameters of syngas combined purifying equipment

Abstract

This scientific work is devoted to the investigation of technical and technological parameters of combined cooling and purifying equipment for syngas, produced from lignin, from mechanical impurities and tars. The design of a combined purifier of syngas consisted of wet and dry stages. A scheme of definition of quantity of mechanical impurities and tars in syngas is presented. Wet stage is an irrigated scrubber 0.65 m high with a filtering header in the form of reservoir with bulk filler. Dry stage is a filtering header 0.9 m high with stuffed filler. Dependencies of the integral purification coefficient from fuel moisture content, water consumption and irrigated header type, syngas velocity in scrubber and scrubber cross-section area were found experimentally. Fractional composition of tar and abrasive and disperse composition of dust in syngas were examined before and after purifier. According to the produced data, a combined purifier provides a high grade of refining of syngas -84.4 % by mechanical impurities and 72 % by tars for wet stage water consumption equal to 15 L•m -3 . It was defined that optimal water consumption for cooling is 7 L•m -3 , and for purifying is 11-15 L•m -3 . Changing the height of the irrigated header does not affect the grade of refining of syngas, and raising syngas velocity in combined purifier deteriorates its purification. The dispersed composition of mechanical impurities proves that the purification coefficient of syngas from ash abrasive particles is more than 99 %. Tar content in syngas after combined purifier is minimal, around 20-30 mg•m -3 . The presented design of equipment for combined purification of syngas is an alternative to expensive filtering equipment for small business and farms.