Intelligent acid-base control boiler blowdown system

Abstract

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.

Description

technical field [0001] The invention belongs to the field of automatic control boilers and belongs to the field of F22. Background technique [0002] When the steam boiler is in operation, the boiler water is concentrated as the steam is produced. When the salt concentration rises to a certain level, the pot water will produce bubbles, soda and water will rise together, and a large amount of water will be carried in the steam, which will cause a serious false water level and make the control of the furnace condition unstable. Therefore, the salt concentration of boiler water must be controlled to ensure steam quality and boiler operation safety. [0003] my country has national standards for the water quality of industrial boilers. For example, in GB1576-2001, for steam boilers with a pressure of 1.6-2.5Mpa and a superheater, it is stipulated that the dissolved solids concentration (TDS) of the boiler water shall not exceed 2500mg / L. Among them, the dissolved solids can be...

AI Technical Summary

Problems solved by technology

For example, 201510601501X automatically discharges sewage according to the steam-water ratio of the boiler, but the existing sewage discharge method is to automatically open the sewage valve when a certain parameter reaches a certain level, and close the sewage valve when a certain parameter drops to a certain low limit

Although this intermittent automatic sewage discharge method is improved compared with manual timed sewage discharge, the salt content always fluctuates between high and low limits, and because of the hysteresis of data control, there is still a certain amount of excessive discharge or insufficient discharge, which is not the best. Excellent pollution control scheme

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