Steam turbine valve steam distribution management function generation method based on CFD method

Abstract

The invention discloses a steam turbine valve steam distribution management function generation method based on a CFD method. The method comprises the steps: establishing an entity simulation model with a height adjusting valve, a guide pipe, a nozzle steam inlet chamber, a full-size three-dimensional whole-circle adjusting-stage nozzle and moving blades; solving the three-dimensional viscous compressible unsteady control equation set and the turbulence model equation set, and obtaining the performance parameters of the fluid research area under the known boundary condition. Based on a fluid domain calculation model, check analysis of a valve flow characteristic curve and actual through-flow capacity of each valve point under a designed valve sequence is carried out for each height adjusting valve. A steam turbine valve steam distribution management function is generated on the basis of the optimized valve flow overlapping degree. According to the method, the flow characteristic rule of the high-pressure regulating valve under different opening working conditions can be accurately calculated, the through-flow capacity of the unit under different valve point working conditions is evaluated and obtained, the valve rise and the total flow linearity under the given overlapping degree condition are effectively checked, and the method has important significance in improving the regulating quality and safe and economical operation of a thermal power generating unit.

Description

technical field [0001] The invention belongs to the field of thermal power generation, and in particular relates to a method for generating a steam turbine valve steam distribution management function based on a CFD method. Background technique [0002] The high-speed valve of the steam turbine is an important regulating device. Its steam distribution method, control method, operation method and equipment performance directly affect the regulation characteristics, operation characteristics, economy and safe and stable operation level of the unit. At present, the grid-connected consumption of large-scale wind energy and other new energy has to require more and more high-power thermal power units to operate rapidly and deeply with varying loads. The adjustment quality requirements of AGC and primary frequency modulation are getting higher and higher. [0003] In the initial design of the steam turbine valve management system, the opening sequence of the high-pressure regulati...

AI Technical Summary

Problems solved by technology

Due to the deviation between the design state and the actual environment, during the operation of some units, there is often a certain high-pressure regulating valve in a certain load range oscillating, and there is a problem of excessive opening of the high-pressure regulating valve; During the switching process of the valve / sequence valve, there will be problems such as large vibration of the high-profile door, uneven force of the high-pressure rotor, large fluctuation of the speed, and rise in the temperature of the bearing bush.

Images