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The desulphurization slurry flow of the coal-fired unit is usually regulated by a single PID loop that controls the pH value of the gypsum slurry. And the desulphurization system is characterized with large inertia and serious hysteresis, which often results in SO2 concentration of the outlet exceeding the standard, and leads the operators to turn the regulating valve to manual mode. The SO2 concentration of the outlet was taken into consideration into the optimized control strategy ofdoi:10.1051/matecconf/201822804004 fatcat:vwbhxz75bjhk5n7az7amqvlmza