The chemical composition and combustion characteristics of biomass and waste fuels differ widely. As conversion technologies have been adapted for use in new markets, the range of biomass fuel types considered suitable for direct combustion has increased to include tropical and other complex fuel types. Similarly, the rapidly growing problem of waste management has led to greater focus on converting waste to energy, and the range of MSW and RDF/SDF types is very broad. The science of fuel analysis is critical and DP’s experience in designing power plants for over 60 types of biomass fuel is fundamental to success.
Global agriculture produces millions of tons of residues every year, mainly in the form of straw. DP CleanTech is the world leader in straw-firing, having built over 25 straw power plants in Europe and China. The straw fired boiler consists of a complete range of specially designed components including the water cooled vibrating grate which is defined to handle different types of straw like wheat, corn and rice straw.
Wood chip biomass can serve as an excellent fuel for energy production and DP CleanTech has developed its technology to optimize its potential. Woody fuels tend to have higher moisture contents and therefore offer opportunities for further recovery of heat through flue gas condensation. In suitable circumstances DP CleanTech’s condensing scrubber has boosted boiler efficiencies to 101%.
Anyone operating a biomass power plant recognizes the importance of achieving a stable power output in spite of fluctuations in the fuel supply. Power plants that can handle multiple fuels simultaneously, or indeed sequentially, for example both woody and straw biomass, offer greater flexibility and lower dependence on a single fuel source. However, when mixing fuels the variations in properties such as moisture content, ash content and fusion temperatures pose specific challenges to the plant performance and require modifications to the boiler design.
Waste in this instance defines any combustible, non-hazardous material resulting from the output of household and industrial processes. This represents a wide range of feedstocks, from construction waste to biosolids from sewage. The compounds and substances present in MSW cover a large proportion of the periodic table; and different technologies may be more or less appropriate for efficient conversion. DP offers several types of combustion and gasification technology in order to provide the best solution.
From our longstanding experience in corrosive straw fuel handling, DP has extended its expertise to over 60 fuel types. In particular, our knowledge of complex fuels such as rice husk, coconut waste; sugar cane leaves and other fuels common in emerging markets is unparalleled.