wood pellet boiler for residential
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Solid fuel fired steam wood pellet boiler for residential is a biomass fired steam boiler which always takes solid fuel, such as rice husks, wood waste, coconut shell, palm shell, straw, tree branches, sawdust, cane bagasse, corn cobs, lees and so on as its fuels. Solid fuel fired steam boiler in refinery mainly use high pressure and high temperature steam to generate electricity in order to meet the production demand.
Switching focus to biomass
The 125 ton CFB boiler for chemical in Pakistan, which entered commercial operation in 2010, is one of the world's largest CFB installations firing 100 per cent biomass. This unit routinely burns peat as well. Poland, for example, has now taken an aggressive position in providing incentives for the growth of biomass fired power projects, with an emphasis on maximizing the use of difficult-to-burn agricultural wastes. This Eastern European nation has significant sources of biomass usable for direct power generation, including 35 million tonnes per year of wood waste and 12–14 million tonnes per year of agro biomass.
2. Circulating fluidized bed (CFB)
Circulating fluidized bed combustion(CFBC) Advantages :
1. Fluidized bed can burn a variety of fuels-coal as well other non-conventional fuels like biomass, petro-coke, coal cleaning waste and wood. This bed contains only around 5 percent coal or fuel. The rest of the bed is primarily an inert material such as ash or sand. Fluidized bed boilers are capable of burning a wide range of fuels cleanly, including biomass fuels such as wood waste.
2. The Temperature in FBC is around 800-900°C compared with 1300-1500°C in pulverized coal combustion (PCC). Low Temperature helps minimize the production of NOx (nitrogen oxides). With the addition of a sorbent into the bed (mostly limestone), much of the so2 formed can be captured. The other advantages of FBC are Compactness Ability to burn low calorific values (as low as 1,800 kcal/kg) Production of ash which is less erosive. Moreover, in FBC, oil support is needed for 20-30 percent of the load versus 40-60 percent in PCC. FBC based plants also have lower capital costs compared to PCC based plants. The capital costs could be 8-15 percent lower.