Optimized design method for nozzle number of nozzle sets considering turbine actual operation binding
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A technology of practical operation and optimized design, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as reduced internal efficiency, small valve opening, throttling loss, etc.
Active Publication Date: 2012-09-19
NANJING POWER HORIZON INFORMATION TECH CO LTD
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[0004] The present invention aims at the problems of large throttling loss caused by the small valve opening of some of the working load points under the conditions of multiple common working load points of the existing unit, and the relative internal efficiency is reduced. Considering the long working hours of multiple load points A method for optimizing the number of nozzles in the regulating stage nozzle group of the steam turbine is proposed under the actual operating constraints of the probability and sliding pressure operation mode of the steam turbine
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specific Embodiment approach 1
[0102] Embodiment 1: The optimal design method for the number of nozzles of each nozzle group considering the actual operation constraints of the steam turbine described in this embodiment is implemented according to the following steps:
[0103] Step 1. Build an optimization model for the number of nozzles:
[0104] Y=W 1 (xgz 1 -Ge 1 ) 2 +W 2 (xgz 2 -Ge 2 ) 2 +...+W l (xgz l -Ge l ) 2 (2-10)
[0105] W 1 , W 2 ......W l Indicates the percentage of operating time at each load point;
[0106] xgz 1 , xgz 2 ......xgz l Indicates the actual flow of each given load point;
[0107] Ge 1 , Ge 2 ......Ge l Indicates the theoretical flow at each given load point;
[0108] The comprehensive deviation degree between the actual flow and the theoretical flow is represented by Y;
[0109] Step 2: Calculate the actual flow of each given load point:
[0110] Calculate the actual flow of 1...l given load points from the number of nozzles of each valve and their c...
specific Embodiment approach 2
[0220] Specific embodiment 2: In this embodiment, in step 2, the dichotomy method is used to calculate p 2 During the process, the pressure after the nozzle is p 1k The calculation process is as follows: the sliding pressure operation law curve obtained by the steam turbine unit in the actual operation: power - main steam pressure, and then according to the actual operating load, check the main steam pressure, and then calculate p 1k . Other steps are the same as in the first embodiment.
[0221] The method of the present invention is further elaborated as follows:
[0222] 1. Genetic algorithm and its improved optimization method
[0223] Genetic algorithm is an efficient global search algorithm based on natural selection and genetic theory, which combines the survival rule of the fittest in the process of biological evolution with the random information exchange mechanism of chromosomes within the population. The genetic algorithm abandons the traditional search method, ...
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Abstract
The invention discloses an optimized design method for nozzle number of nozzle sets considering turbine actual operation binding and relates to an optimized design method for the nozzle number of a turbine. The optimized design method aims at solving the problem of large throttle loss and relative reduced inner efficiency caused by small valve opening degree of several working load points under the condition of a plurality of normally used working load points of the existing units. The method includes: constructing a nozzle number optimizing model; calculating actual flow of each load point; calculating theoretical flow of each designated load points; constructing constraint conditions of the nozzle number optimizing model; and obtaining a corresponding optimized nozzle number combination when the comprehensive deviation degree Y is minimum under the designated load point based on the genetic algorithm theory. The optimized design method ensures that when the unit reaches the load points, the adjusting-level valves can be in the full-opening or full-closing state, so that the maximum valve nozzle number combination can be optimized, and the unit has optimal economy under the condition that the throttling reduction of an adjusting level of the turbine is reduced maximumly.
Description
technical field [0001] The invention relates to an optimal design method for the number of nozzles of a steam turbine. Background technique [0002] A steam turbine is a rotating machine that uses steam as power and converts the energy of steam into mechanical work. It is one of the most important prime movers in the world and has an extremely wide range of applications in power plants, industrial production, ships and other industries. Therefore, optimizing the steam turbine has great practical application value in improving economic efficiency and saving energy. [0003] The start and stop of the steam turbine and the change of power are realized by changing the opening degree of the regulating valve, thereby changing the steam flow or steam parameters entering the steam turbine. At present, the existing steam distribution methods include nozzle steam distribution, throttle steam distribution, sliding pressure steam distribution, full ESC "valve management" steam distribu...
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Patent Type & Authority Applications(China)
IPC IPC(8): F01D9/02
Inventor 刘金福万杰付云峰李飞张怀鹏张可浩游尔胜王一丰蔡鼎于达仁
Owner NANJING POWER HORIZON INFORMATION TECH CO LTD
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