METHOD FOR CONTROLLING LIQUID LEVEL OF ABSORBING TOWER IN FLUE GAS DESULFURIZATION APPARATUS ACCORDING TO WET LIMESTONE/GYPSUM PROCESS

摘要

PURPOSE:To constantly keep the concn. of CaCO3 in a washing solution even if the load of a boiler is varied, by calculating the level set valve of a washing solution as the function of the load of a boiler or the flow amount of fuel and operating the regulation valve of the absorbing solution withdrawing piping from an absorbing tower by a level regulator. CONSTITUTION:The flue gas from a boiler 14 is introduced into an absorbing tower 3 from a flue gas inlet duct 1 and cooled at the inlet part of the absorbing tower by a washing solution to remove the dust in said flue gas and SOx in the exhaust gas is further absorbed in the main body part of the absorbing tower 3. The washing solution is recirculated by a pump 5 and recirculation piping 6 and a part thereof is discharged out of the system from piping 8. The boiler load detection signal from the detector arranged to the boiler 14 is inputted to a function generator 12 and the output signal thereof is inputted to a level detection regulator 9 as the level set value thereof. A regulation valve 10 is operated by the level detection regulator 9 so as to adjust the level of the washing solution to said set value to regulate the withdrawal amount of the washing solution.