Control method and system for speed regulation valve of steam turbine

Abstract

The invention provides a control method and a control system for a speed regulation valve of a steam turbine, wherein the method comprises the steps of: measuring the total flow rate controlled by each one of a plurality of speed regulation valves; setting a load threshold for the steam turbine, and setting the overlapping degree for each speed regulation valve; controlling the plurality of speed regulation valves to start according to the overlapping degrees of the speed regulation valves and according to the measured total flow rates controlled by the speed regulation valves in a sequence from small to large if the load of the steam turbine is larger than or equal to the load threshold; and controlling the plurality of speed regulation valves to start according to the overlapping degrees of the speed regulation valves and according to the measured total flow rates controlled by the speed regulation valves in a sequence from large to small if the load of the steam turbine is smaller than the load threshold. The method and the system disclosed by the invention have the advantages of realizing the technical effect of reducing energy consumption and guaranteeing safety and economic benefit of the steam turbine utilization.

Description

technical field [0001] The invention relates to the field of steam turbine control, in particular to a control method and system for a speed regulating valve of a steam turbine. Background technique [0002] At present, the steam turbines used in many large power plants in my country are mainly products manufactured and imported from the 1950s to the 1970s. Most of the steam turbines at that time used the cam steam distribution mechanism of the hydraulic speed control system to realize the control curve for the control of the speed control valve. This kind of control technology has complex structure, many components, poor speed control accuracy, high sluggish rate, and slow response. Especially after a period of use, the load fluctuates greatly, and even endangers the safe operation of the unit. [0003] With the transformation of production methods, energy saving and high efficiency have been paid more and more attention by people. In order to protect the existing investm...

AI Technical Summary

Problems solved by technology

Although the modified electro-hydraulic method can facilitate the control of the speed control valve of the steam turbine, but because the speed control valve of the steam turbine is very different from the condition when it leaves the factory, simply changing the control method cannot achieve the goal of energy saving and efficiency improvement

For the problems referred to above, there is no solution in the prior art

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