Constant-slip pressure curve test optimization method of steam turbine under throttling and steam distribution

Abstract

The invention discloses a constant-slip pressure curve test optimization method of a steam turbine under throttling and steam distribution. The method comprises the following steps that a, the openingdegrees of governor valves are set, and a heat system parameters of a unit is kept stably for 15 minutes to complete the test in sequence; b, DCS test data is acquired and a mean value is calculated;c, correction through flows and correction generator powers are calculated under the opening degrees of all governor valves, and a governor valve flow characteristic curve and a governor valve powercharacteristic curve are obtained; d, the opening degrees of four governor valves are set and a main steam pressure with 50% rated load and the main steam pressure with 80% of the rated load are calculated, and four sets of pre-selected fixed sliding pressure curves are obtained; e, a variable load speed rate is set to carry out a load up test and a load down test, the opening degrees of the governor valves corresponding to the set variable load speed rate is calculated; and f, the main steam pressure corresponding to the 50% rated load and the main steam pressure corresponding to the 80% rated load are calculated, the two points are connected to draw a straight line, so that the optimized constant-slip-pressure curve is obtained. According to the method, the constant-slip pressure curve of the steam turbine under the throttling and steam distribution can be obtained, the curve gives consideration to the operation economy and load response characteristics of the unit.

Description

technical field [0001] The invention belongs to the field of power plants, and in particular relates to a constant sliding pressure curve test optimization method of a steam turbine under throttling steam distribution. Background technique [0002] In recent years, new large-scale steam turbine units with advanced energy consumption and primary and secondary reheating mostly adopt throttling steam distribution mode, while some old steam turbine units participating in deep peak regulation are out of safety in operation under ultra-low load Considering that, it also adopts throttling steam distribution mode to run. In the past, the steam turbine constant sliding pressure curve optimization work was carried out under the nozzle steam distribution mode, but most of the steam turbines currently operating under the throttling steam distribution mode, the power plant only considers the load response ability of the power grid when it participates in peak regulation The assessment r...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a constant sliding pressure curve test optimization method for a steam turbine under throttling steam distribution, which solves the problem of existing steam turbines operating under throttling steam distribution and meets the assessment requirements of the power grid. Defects that cannot meet the requirements of energy saving

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