Flue gas emissions from pulverized oil shale fired boilers of Estonian and Baltic power plants have been studied.The concentrations of NO,, CO, C.H, HCI, НЕ апа polycyclic aromatic hydrocarbons in flue gases have been found to be relatively low and acceptable according to German emission limits, for instance. Desulphurization degree of flue gases by SO, absorption with ash has been found to vary depending on boiler type and operation conditions. In spite of significant sulphur capture (average values for different boilers in the range between 68 and 77 % of the initial sulphur content of the fuel), SO, concentrations in flue gases remain still very high (up to 2,600 mg/m>, 10 % O, ). Very high concentrations ofparticles, especially at Estonian Power Plant (up to 6,250 mg/m>, 10 % O, ) have been detected. Heavy metal emissions were too high by the reason of particle control insufficiency as well.Yearly emission estimates of this study support the former Estonian ones within the range of 10-15 %.
Emissions of fine particulates of grade PM2.5 and PM10 from different oil shale (OS) power plant (PP) boilers were studied. Pulverized (PF) and circulating fluidized-bed (CFB) boilers burning oil shale, biomass and retort gas were investigated. Particle emissions from OS boilers were found to be very fine. Over 90% of emitted particulate matter was in the size range of PM10 and 40-60% under the size of 2.5 µm. Distribution of fine particles by size was found to be depending on OS firing mode (PF or CFB). At CFB firing mode the share of the finest fraction PM2.5 was higher than that at PF firing mode. The distribution varied at the same type of different PF boilers, depending on the efficiency of boiler flue gas cleaning system and value of total suspended particulates' emission (TSP).
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