Thus, from a general point of view biomass energy can be recommended. The introduction of small-scale biomass fueled engine systems as a new electricity source or as replacement for diesel and petrol driven power units seems highly attractive for small industries in rural areas as well as villages. Most promissing is systems for wood industries with a need for electricity and a continous output of residue products as wood chips, saw dust and bark.

Economic Analysis of Wood-gas Utilization

The conversion of stationary diesel engines to run on wood-gas is one of the most important potential uses for shaft-power. The example analysed is a comparison between a conventional 30 kW diesel unit and an imported complete gasifier and engine unit. This example is chosen, because it is most feasible to replace the similar diesel/petrol systems.

By using wood-gas in rural area of tropical countries with a good wood supply, it is possible to save 12-50% of the costs compared to generating electricity by a diesel engine, table 2. Thus, a wood-gasifier engine system is an excellent investment. In most countries it can be locally manufactured and reduce import of costly fuel.

Perspectives

Wood gas for electricity production has been found to be promising especially in rural areas and on tropical islands where fossil fuels are extremely expensive and high vegetation growth generates enough biomas for a gasifier system. By changing from a conventional diesel engine a net saving of 35% of the costs can be achieved. Gasification characteristics of tropical wood are not well enough known, and need to be explored. Promising results from use of gasifiers in Philippines, Brazil, etc. have been reported, so we can suppose there will be a very little risk for failure by increasing use of biomass-fuel.