FIRES IN EXPLOSION RISK IN COAL POWER GENERATING PLANTS: Many types of combustible and flammable materials can be present in coal-fired plant: Coal. The main combustible fuel. In addition, coal dust is a major source of dust explosions in a coal-fired power plant. It can cause primary explosion when the right concentration of finely divided dust, suspended in air, is exposed to a sufficient source of ignition causing combustion. If this primary explosion occurs, additional available dust can disperse and secondary explosions can spread throughout the facility. Propane. Used as start-up fuel. It can be present in gas cylinders, piping to ignition burner and to combustor, gas shut-off valve, gas control valve block, gas-relief valve. Natural gas. As start-up or alternate fuel. Gas can be present in gas compressor station, filter and scrubber station, gas pre-heater areas, gas shut-off valve and filter, gas control valve block, gas relief valve, and gas piping. Fuel oil. As start-up or alternate fuel. Can be present in oil tanks, fuel unloading and forwarding pump station, fuel oil booster pump and leakage tank, fuel oil control valve block and fuel oil piping to burners. The fuel oil becomes flammable when heated above its flash point. Hydrogen. As cooling medium for generator cooling and release from DC system batteries. Also present in hydrogen gas unit, seal oil unit, control cubicle and piping. Ammonia. Aqueous ammonia is used for nitrogen oxide emission reduction by selective catalytic reduction (SCR) or selective non-catalytic reduction (SNCR) method. Includes ammonia storage and piping.
Posted on: Thu, 07 Nov 2013 08:51:19 +0000
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