Overload steam supplementing throttling steam distribution steam turbine flow characteristic test method

Abstract

The invention discloses an overload steam supplementing throttling steam distribution steam turbine flow characteristic test method. The method comprises the following steps: under the condition that initial parameters are certain and an overlapping degree of a regulating valve is removed, carrying out a steam turbine flow characteristic test; simultaneously combining a Friuli Greig formula of a second stage of a high pressure cylinder with a heat exchange formula of a number one high-pressure heater, and constructing a steam inlet flow mathematics representation equation of a steam turbine set; obtaining a zero-overlapping steam distribution function by performing direct value mapping and power correction of overload steam supplementing valve position instructions through "steam turbine steam inlet flow-main regulating valve position instructions and the overload steam supplementing valve position instructions" at a zero-overlapping state; and through a dual means of setting "a valve regulating openness amplitude limit under amplification of each unit of steam inlet flow instructions" and value quantification of "the influence degree of main adjusting valve throttling loss on heat consumption of the steam turbine set", refinement setting on the overlapping degree of the regulating valve is carried out, accordingly, an overlapping degree steam distribution function according with a steam turbine actual flow characteristic is obtained, and thus accurate control of a steam turbine steam inlet flow is realized.

Description

technical field [0001] The invention relates to a flow characteristic test method of a steam turbine with overload, steam supplement and throttling distribution, and belongs to the technical field of steam turbine generator set operation. Background technique [0002] In recent years, the second-generation throttling steam distribution super (super) critical steam turbine unit represented by the third phase of Waigaoqiao has been put into production in a large number in my country's power market. According to the design characteristics of companies such as Siemens and Alstom, the second-generation throttling steam turbine unit adopts the overload steam supplement technology for the first time. The overload steam supplement technology starts from a certain working condition to draw a stream of fresh steam (5% to 10% of the steam intake) from behind the main steam valve and in front of the main regulating steam valve, and after throttling by the load supplement steam valve, th...

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Problems solved by technology

Up to now, there is no perfect, mature and standardized test method for flow characteristic of steam turbine unit with overload supplementary throttle and distribution steam in the industry

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