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

Publication Type  Journal Article
Year of Publication  2018
Authors  Haseen Siddiqui, S.K.T.
Journal Title  Bioresource Technology
Volume  266
Pages  220-231
Start Page  220
Journal Date  06/2018
Short Title  Revamping downdraft gasifier for high ash biomass
Publisher  Elsevier
Key Words  Clinker; Downdraft gasifier; Garden waste pellets; Grate movement interval; Air split ratio
Abstract  

The conventional downdraft gasifier, when used with garden waste pellets (ash ∼10%) 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 20 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 3.59 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.

URL  https://doi.org/10.1016/j.biortech.2018.06.086
Citation Key  6318
Export  Tagged XML BibTex
AttachmentSize
Revamping downdraft gasifier to minimize clinker formation for high-ash garden waste as feedstock.pdf1.84 MB