Industrial biomass gasification
Under increasingly difficult production conditions, the fuel costs for SMEs are becoming a burden. Meanwhile in Vietnam, each year there are about 8.2 million ton of rice hull, 1 million ton of coffee bean husks, 3 million tons of sawdust, wood chips corn cobs, etc with up to approximately 100 million tons of biomass in total per year. It is a huge source of renewable fuel.
The gasification technology and equipment developed by CCS during the implementation of SPIN project is a large-diameter gasifier stove of ø500-ø800mm using biomass fuels as a heat source for the need of SMEs, such as boilers, dryers etc. One ø500 ricehull-based gasifier stove generates about 103KWh of energy. The pyrolysis flame from biomass fuels reaches a high temperature of 1700 Degree Celsius, deeply-fires and exposes to the heat exchanger of the equipment, which provides higher heat exchange efficiency than direct combustion.
Recently, the gasification stove has been used in the tea industry (Suoi Giang, Yen Bai and Moc Chau, Sonla), applied successfully as heat source for the boiler in Ngoc Dong, Ha Nam and Quan Hoa, Thanh Hoa, supplying heat for lumber kiln in PISICO company, Quy Nhon, Bing Dinh. Using biomass as an alternative source for fossil fuel (coal or natural gas) has saved a significant amount of energy for the enterprises.
In addition, the remained bio-ash (biochar) - a by-product of the gasification process is also a precious resource. Gasification retains the geometric structure of the material before burning (rice hull, coffee bean's husk, etc..). It helps keep nutrients to improve soil, makes the soil more porous and thus reduces the amount of chemical fertilizers required. Besides, because of the remaining components of fixed carbon in biochar (20% C of the material), using it would add more carbon to the soil and this is an efficient solution as carbon is buried underground instead of emitted into the atmosphere.