Drum water level full control system

Abstract

The invention provides a whole-process control system for a boiler water level. The whole-process control system comprises a magnetic levitation water level device, a differential pressure water level device and a switching device, wherein the magnetic levitation water level device is used for measuring the boiler water level value in a boiler, and outputting the boiler water level valve to a far end; the differential pressure water level device is used for obtaining the boiler water level value in the boiler through hydraulic pressure and outputting the boiler water level value; the switching device is respectively connected with the magnetic levitation water level device and the differential pressure water level device, is used for comparing the boiler water level outputted by the magnetic levitation water level device with that outputted by the differential pressure water level device, and selecting the boiler water level value outputted by the magnetic levitation water level device or a differential pressure water level device as a water level reference according to the comparison result, and is connected with a water level control system. Therefore, not only the labor intensity of workers is reduced, and misoperation risks, caused possibly by a large number of operations, are avoided, but also the absolute starting time of a unit is saved, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to the field of management of thermal power generators, in particular to a whole-process control system for the water level of a steam drum. Background technique [0002] There are a lot of complicated manual operations in the process of starting and stopping thermal power generating units, and misoperation accidents will inevitably occur. However, the realization of APS (one-button start-stop) replaces most of the manual operations and eliminates the potential safety hazards. , Improve the correctness and standardization of unit start and stop, and greatly reduce the work intensity of the staff. In addition, APS realizes fast, orderly and precise start-up and stop of the unit, shortens the time for start-up and stop of the unit, reduces the coal consumption and gas consumption during the start-up and stop process, and improves the efficiency of the unit. The realization of unit APS is a symbol of the improvement of the automatio...

AI Technical Summary

Problems solved by technology

Since there is no effective remote water level signal measurement means for monitoring and control in the cold state of the boiler and the initial stage of ignition, the design cannot realize the automatic control function of the water level in the whole process of boiler startup. Water can be supplied manually through manual monitoring, which brings great operating pressure to operators, wastes manpower and time, cannot realize APS control, and reduces the automation level and efficiency of the unit

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