A boiler system that intelligently controls the blowdown rate according to the pH value

Abstract

The invention provides an automatic control system. The system comprises a monitoring diagnosis controller and a boiler; the boiler comprises a blow-down pipe arranged at the lower end of a boiler drum; a blow-down valve is arranged on the blow-off pipe; one end of the blow-down valve is connected with a valve adjusting device; the valve adjusting device is in data connection with the monitoring diagnosis controller for transferring valve openness data to the monitoring diagnosis controller and receiving an instruction from the monitoring diagnosis controller to adjust the openness of the blow-down valve; the drum comprises a water quality analyzer; the water quality analyzer comprises a pH value testing unit for measuring the pH value of water in the drum; the water quality analyzer is in data connection with the monitoring diagnosis controller for receiving the measured pH data; boiler blow-down is termly performed; the blow-down time is kept invariable; and a central diagnosis monitor automatically sets the blow-down speed according to the measured pH value to automatically control the blow-down quantity. As the blow-down speed is automatically calculated, compared with the prior art, the system has the advantages that the lagging is reduced, and the optimal blow-down control can be realized.

Description

technical field [0001] The invention belongs to the field of 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 approximated as t...

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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