There are 3 choices in accommodating power station facility which have beeninstalled to fulfill standard regulation of environmental quality which progressivelytighten. Firstly, facility modification of pulverized–coal fired power plant byapplying a flue–gas desulfurisation technology throw away to cost moneyinstallation of tired which can 20% of total cost development of it. Secondly,modification system of coal fired power generation become natural gas combinedcycle (NGCC) can reach low emission, but fuel cost relatively high, so willinfluence the electricity generating cost. Third, modification system of electricgeneration which have been installed by utilizing a mechanism of coalgasification is most efficient and best alternative to yield an environmentalfriendly of electric generation combined cycle. In this paper, writer try to make abasic design of circulating fluidized–bed coal gasifier using clay catalist relatedon third choice which expected applicable in the next future to come replacepower station system which have ended a period as well as newly even if.Kata Kunci: gasifier batubara unggun mengambang, katalis tanah liat,pembangkit listrik

All this time, PT Natcham’s gasifier only be used for synthetic gas production asfuel of 400 kW gas engine power generation for the mushroom industry’selectricity needs while energy crisis. From now on, the application anddevelopment of biomass gasification technology is focused on synthetic gasproduction to be processed furthermore from gas to liquid (GTL) throughFischer–Tropsch synthesis process. H2+CO contained in syngas product is low(average 20% of total producer gas) with H2/CO ratio = 0.30–0,35. Producedsynthetic gas composition more and less equal to the design maker of Peako –China that is feasible to be utilized as fuel for 400 kW gas engine powergeneration, but not meet yet specification requirements of syngas composition asgas feeding for Fischer–Tropsch synthesis process (Gas–To–Liquid, GTL).Installation of O2 and steam injection system inside gasifier necessary to improvesyngas quality, all at once N2 content decreasing in the syngas, with the result ofH2/CO ratio >1 that will improve liquid product.Kata kunci: fixed–bed gasifier, gasification, rice husk, synthetic gas

Fuel spray injection plays a main role in determining the performance of dieselengines, where the spray pattern illustrates fuel combustion occurs in thecombustion chamber. Characteristics of Sauter Mean Diameter (SMD) spray isdevoted to fuel evaporation, and mixing and combustion quality affected bypressure injection (P) and the physical chemical properties of the fuel (density,surface tension, viscosity and boiling point). From fuel spray test results showedthat fuel evaporation characteristics of fuel at a certain pressure effect on engineperformance. The higher the injection pressure will reduce the diameter of thefuel sprays after injection (SMD), thus speeding up evaporation and mixingprocesses between fuel and air in the combustion chamber with resulted thecombustion process is more completelyKata kunci: characteristics of fuel spray, diesel fuel, DME.