The invention provides an
intelligent control system which comprises a monitoring and diagnosing controller and a boiler. The boiler comprises a blowdown
pipe arranged at the lower end of a boiler steam pocket, a blowdown valve is arranged on the blowdown
pipe, one end of the blowdown valve is connected with a valve adjusting device, the valve adjusting device is in
data connection with the monitoring and diagnosing controller, and therefore valve aperture data can be transmitted to the monitoring and diagnosing controller; meanwhile, a command is received from the monitoring and diagnosing controller, and the aperture of the blowdown valve is adjusted; the steam pocket further comprises a
water quality analyzer which comprises a PH value testing unit so as to measure the PH value of water in the steam pocket, and the
water quality analyzer is in data conenction with the monitoring and diagnosing controller, and therefore measured PH data are conveniently received; and the boiler is subject to blowdown, the blowdown time and blowdown speed are automatically set by the central monitoring and diagnosing controller according to the measured PH value, and therefore the blowdown amount is automatically controlled. According to the
intelligent control system, the blowdown amount is automatically calculated; and compared with the prior art, the hysteretic nature caused by
automatic control in the prior art is reduced, and the optimal blowdown control can be achieved.