Soft measurement method and device for reheat steam flow of coal-fired power plant
A technology for reheating steam flow and coal-fired power station, which is applied in the field of measurement and can solve the problems of complicated calculation, many measuring points, unable to reflect the flow of reheated steam, etc.
Inactive Publication Date: 2014-04-30
YANTAI LONGYUAN POWER TECH
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Problems solved by technology
[0031] 1) Disadvantages of fixed coefficient method
In the actual operation of the generator set, due to the influence of many factors, the load fluctuates frequently, and the change of the operation mode and operation parameters makes the calculated reheat steam flow rate not reflect the real reheat steam flow rate.
[0032] 2) Disadvantages of using the steam pressure and temperature calculation method at the inlet of the medium pressure cylinder
The accuracy is poor, but it can basically meet the operation requirements
[0033] 3) Disadvantages of differential pressure method
Due to the fact that there are many unmeasurable factors during the operation of the actual unit, the magnitude of the extraction error obtained by this method cannot be estimated
[0034] 4) Disadvantages of heat balance method
The calculation result of the heat balance method is accurate, but it requires many measuring points and the calculation is complicated, and due to the existence of the intermediate volume link, this formula is only suitable for steady-state conditions
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[0079] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as any limitation of the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0080] The relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
[0081] At the same time, it should be understood that, for the conveni...
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The invention discloses a soft measurement method and device for reheat steam flow of a coal-fired power plant. Work condition parameters are detected in real time, the sum of first-grade steam extraction flow D1 and second-grade steam extraction flow D2 is calculated, the accurate value Drj (t) of the reheat steam flow is calculated by utilizing the sum of the first-grade steam extraction flow D1 and the second-grade steam extraction flow D2, an existing heat balance formula is simplified, and then the high-accuracy soft measurement result of the reheat steam flow is obtained. Meanwhile, the dynamic value Drf (t) of the reheat steam flow is determined by utilizing grade front parameters, and information fusion is carried out on the accurate value Drj (t) and the dynamic value Drf (t) of the reheat steam flow to obtain the final soft measurement value Dr (t) of the reheat steam flow. In the information fusion process, errors generated when Drf (t) calculates the stable work conditions are restrained through a filter function, therefore, the soft measurement value Dr (t) of the reheat steam flow has the accuracy of the accurate value Drj (t) of the reheat steam flow and the dynamic characteristics of the dynamic value Drf (t) of the reheat steam flow, and the accuracy of boiler calculation indexes can be improved.
Description
technical field [0001] The invention relates to the field of measurement technology, in particular to a soft measurement method and device for reheating steam flow in a coal-fired power station. Background technique [0002] The reheat steam flow rate is often used to calculate some important indicators for monitoring the state of the boiler and steam turbine, such as the oxygen content of the boiler exhaust smoke and the heat rate of the steam turbine, which are important power plant boiler parameters. The reheat steam flow usually has no measuring points in the actual power plant boiler monitoring system, and the data of the reheat steam flow currently used are obtained through indirect calculation. At present, thermal power plants generally undertake the task of load peak regulation, and large changes in boiler load cause large changes in reheating steam flow, which puts forward higher requirements for improving the accuracy and real-time performance of the calculation me...
Claims
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Inventor 张杨隋海涛石书雨范国朝吕霞
Owner YANTAI LONGYUAN POWER TECH