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Why is chlorine tested in various solid fuels?

Although biomass generally has a low concentration of chlorine compared with coal, heavy corrosion often occurs in a power plants that use biomass fuel causing leaks in the pipes of heat exchangers. Corrosion of heat transfer apparatus is strongly associated with ash deposits in the pipes.
Super-heater steam pipes are generally not designed to accommodate the chlorine in biomass fuels, therefore the concentration of chlorine in wood products impacts power plant outage frequency.