Optimal initial pressure global optimization method for steam turbine set based on multi-factor

Abstract

The invention relates to an optimal initial pressure global optimization method for the steam turbine set based on multi-factor, and belongs to the technical field of steam turbine set operation technologies. The method comprises building a quantitative calculation model for steam turbine variable pressure operation consumption differences, obtaining an economic characteristic variation trend in a feasible sliding pressure interval of the steam turbine set under different pitch peak working conditions according to a global variable pressure optimization test, and blending the economic characteristic variation trend with other target parameters of primary frequency modulation characteristics, backpressure characteristics and the like of the set to obtain optimal operation initial pressure of the steam turbine set based on multi-factor to be adapted to power station site actual operation demands and achieve both the power station economy and the power grid safety. The optimal initial pressure global optimization method is applicable to optimal initial pressure global optimization of the steam turbine set.

Description

technical field [0001] The invention relates to a multi-factor global optimization method for the optimal initial pressure of a steam turbine unit, which belongs to the technical field of steam turbine generator unit operation. Background technique [0002] Due to the gap between peak and valley power demand, the turbo-generator set is in peak-shaving operation state for a long time. The selection of steam turbine operation mode under partial load is directly related to the thermal economy and safety of the unit. Scholars at home and abroad have done a lot of research on the characteristics of variable pressure operation of steam turbines, and generally use the analysis method of combining discrete comparison of multiple operating points and differential consumption analysis to obtain the optimal operation mode of the unit. [0003] The optimal initial pressure test method for conventional steam turbines usually adopts several base loads, and selects several different main ...

AI Technical Summary

Problems solved by technology

[0006] The optimal initial pressure test method of conventional steam turbine generally adopts the form of discrete comparison of "absolute value" of multiple working condition points. As far as the test itself is concerned, there are the following deficiencies: ①Constrained by time and cost, the "to be compared" working condition point Usually 3 to 5, therefore, the unit initial pressure value span between different working conditions is relatively large; at the same time, the selection of the "to be compared" working condition point lacks sufficient basis, human factors are greatly affected, and there are easy to lose the optimal point of unit efficiency ② only rely on the comparison of the "absolute value" of the test results of multiple sample working conditions, which is affected by the large uncertainty of the test results, it is difficult to accurately explain the difference in unit efficiency; ③ the proposed consumption difference The theoretical basis of the analysis method is insufficient, ignoring the coupling between thermal parameters, and there is a certain deviation between the analysis results and the actual; ④ Even if part of the test is based on the principle of the steam turbine, based on the valve point bonus in the feasible sliding pressure range, the optimization is carried out in a targeted manner ; but the valve point depends on the flow characteristics of the steam distribution mechanism and the reasonable setting of the overlapping degree, so the so-called "valve point" does not always have a bonus

[0007] (2) The optimization goal is single and lacks practical guidance:

[0008] The usual "optimum initial pressure" only considers the maximization of unit efficiency one-sidedly, and does not take into account other factors and objectives such as the primary frequency regulation characteristics and back pressure characteristics in the peak-shaving operation of the unit. Therefore, the optimal initial pressure operation curve obtained from the test It cannot meet the needs of the actual peak-shaving operation of the unit, and even affect the safety of the power grid

Furthermore, the conventional steam turbine optimal initial pressure test method is affected by the complexity of the boundary conditions of the thermodynamic system and the accuracy of test instruments, and it is difficult to obtain the results of the steam turbine unit under different initial pressures through the test results with large uncertainties under multiple working conditions. Therefore, this method cannot realize the fusion decision of other multi-factors such as unit economic characteristics and primary frequency regulation characteristics.

Images