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Type of information: TECHNICAL ARTICLES

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Revamping downdraft gasifier to minimize clinker formation for high-ash garden waste as feedstock

The conventional downdraft gasifier, when used with garden waste pellets (ash â?¼10%) as feedstock, exhibits formation of clinker due to hardening of softened ash, which results in discontinuous flame and intermittent operation. The design and operation protocol of the gasifier was appropriately modified to circumvent this problem. The effects of parameters such as grate movement, equivalence ratio (ER), and ratio of air entering at combustion and drying zones (split ratio) were systematically studied to maximize the lower heating value (LHV) of gas and minimize the amount of clinker. The grate movement of once in 20â?¯min, ER of 0.32, and air split ratio of 0:100 together proved to be the best for garden waste pellets. The producer gas LHV and cold gas efficiency were 3.59â?¯MJ/Nm3 and 62.61%, respectively, and comparable to the producer gas obtained from other biomass resources such as rice husk, wheat straw, and cotton stalks.

» Author: Haseen Siddiqui, Sonal K. Thengane, Sandeep Sharma, Sanjay M. Mahajani

» Reference: Bioresource Technology, Volume 265

» Publication Date: 01/10/2018

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