A self-adaptive disturbance-free switching device for steam-driven induced draft fan in thermal power plant

Abstract

The invention discloses a self-adaptive undisturbed switching device of a steam-driven induced draft fan in a heat-engine plant. The self-adaptive undisturbed switching device of the steam-driven induced draft fan in the heat-engine plant comprises a control signal main center device, an undisturbed switching unit, a stationary blade server, a rotating speed server, the induced draught fan and a small steam engine. The control signal main center device calls running data in a data collecting system of the heat-engine plant, and transmits the called running data to the undisturbed switching unit, the undisturbed switching unit carries out judgment of switching control over the opening degree of stationary blades of the induced draft fan and the rotating speed of the small steam engine on the received data, and transmits control instructions after the judgment to the stationary blade server and the rotating speed server, and the stationary blade server and the rotating speed server act according to the received control instructions to control the induced draught fan and the small steam engine respectively, wherein the stationary blade server is used for controlling the opening degree of the stationary blades of the induced draft fan, and the rotating speed server is used for controlling the rotating speed of the small steam engine. The self-adaptive undisturbed switching device of the steam-driven induced draft fan in the heat-engine plant is accurate, efficient and capable of carrying out automatic control according to the real-time running parameters of different induced draft fans and different heat-engine plants.

Description

technical field [0001] The invention belongs to self-adaptive automatic control equipment in a thermal power plant, in particular to an adaptive non-disturbance switching device for a steam-driven induced draft fan in a thermal power plant. Background technique [0002] National environmental protection requirements stipulate that the FGD system of new power plants does not have a flue gas bypass and the existing FGD system must remove the bypass flue, which makes the power plant have higher and higher requirements for the FGD system. The FGD system does not have a flue gas bypass, and its operation is directly related to the safety of the unit. If the FGD system is shut down, the unit must also be shut down. From the moment the boiler is ignited, all the flue gas will directly enter the absorption tower for treatment, which makes the flue gas system in the design etc. are quite different from the conventional FGD system. For this reason, when new and old power plants insta...

AI Technical Summary

Problems solved by technology

It will have safety hazards when the induced draft fan fails and quickly reduces the load (runbank, RB), and it lacks the ability to respond quickly to the negative pressure of the furnace

[0005] After the steam-driven induced draft fan is adopted, the switch between the two controls becomes very complicated. If the switch is not done properly, it is easy to cause major accidents such as small machine stall and fan surge.

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