Resulting power output
Assuming that the engine modifications described above are correctly implemented, decrease in maximum power output of petrol engines without turbo or supercharging can be limited to about 30 percent. Turbo or supercharged combustion running engines on producer gas can have power outputs equal to those in petrol operation.
Derating of direct injection diesel engines in dual fuel operation can usually be limited to 15 — 20 percent (80 percent producer gas, 20 percent diesel fuel).
2.1.1 Gas quality requirements for trouble-free operation
When a gasifier system is used in conjunction with an internal combustion engine, an important requirement is that the engine is supplied with a gas that is sufficiently free from dust, tars and acids. The tolerable amounts of these substances will vary depending on the type and outfit of the engine. Tiedema and van der Weide (38) give as tolerable average amounts for currently available engines the following values:
dust: lower than 50 mg/m3 gas preferably 5 mg/m3 gas tars: lower than 500 mg/m3 gas
acids: lower than 50 mg/m3 gas (measured as acetic acid).