A steam turbine flow characteristic optimization method based on optimal overlap degree of control valves
A technology of flow characteristics and optimization methods, applied to mechanical equipment, engine components, machines/engines, etc., can solve problems such as not being able to ensure a reasonable degree of overlap of adjustment gates
Active Publication Date: 2017-01-11
STATE GRID CORP OF CHINA +2
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At present, the methods for determining the overlap degree of steam turbine valves mainly include the drawing method or the empirical estimation method, and the setting has a certain degree of subjectivity, which cannot guarantee the reasonable degree of the degree of overlap of the valves.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 2
[0059] This embodiment is basically the same as Embodiment 1, and its main difference is: step 1) in this embodiment gradually changes the opening of the tune door according to the specified amount of change, specifically refers to gradually reducing the opening of the tune door according to the specified amount of change degree until the damper is fully closed. Undoubtedly, this method is the same as the method in the first embodiment, and can also realize data collection related to the steam flow rate of the reversing door at different opening operating point, so it will not be repeated here.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a turbine flow characteristic optimization method based on the optimal overlapping degree of control valves. The method comprises the steps that a flow characteristic function is set up in advance for all control valves, and the maximum steam flow and the minimum opening degree corresponding to the maximum steam flow of all the control valves are determined; and according to a target flow command, the control valves of a turbine are opened according to the control valve opening sequence under a sequence valve mode, and for each opened control valve, if the sum of the maximum steam flow of the current opened control valves cannot meet the requirement, the next control valve is opened when the actual opening degree reaches the minimum opening degree corresponding to the maximum steam flow until the sum of the maximum steam flow of all the opened control valves meets the requirement. By means of the method, pressure measuring points do not need to be mounted behind all control valves, the accuracy of the overlapping degree is high, and the subjectivity of people can be avoided; the defects of a graphing method and an empirical estimation method for obtaining the overlapping degree of the control valves in the prior art are overcome, the flow characteristic function of the control valves can be optimized, and operation stability and economy of the turbine are improved.
Description
technical field [0001] The invention relates to the technical field of automatic control of steam turbines, in particular to a method for optimizing flow characteristics of steam turbines based on the optimal overlap degree of adjustment gates. Background technique [0002] The regulating valve is an important regulating mechanism of the steam turbine. When the steam distribution of the steam turbine adopts the sequential valve control method, each regulating valve is opened in sequence according to the preset sequence. When the previous tone door has not been fully opened, the next tone door will be opened in advance, and the amount of this early opening is called the overlap degree of the tone door. When the steam turbine valves have no overlap or the overlap is too small, the throttling loss is small and the economy of the unit is high, but it will cause uneven load changes of the unit and increase the speed change rate of the speed control system; if the overlap is too ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): F01D17/00
Inventor 王志杰朱晓星陈厚涛傅强
Owner STATE GRID CORP OF CHINA