Method for measuring heat absorbed by boiler water cooled wall in real time
A real-time measurement and water-cooled wall technology, applied in the field of boiler systems, can solve problems such as the inability to apply the radiation heat transfer model and the lack of effective measurement values
Inactive Publication Date: 2012-08-22
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
However, the vast majority of thermal power plants in China have not put into operation such equipment
That is to say, for a large number of thermal power plants, the furnace temperature has no effective measurement value, so the radiation heat transfer model cannot be applied
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[0047] Below in conjunction with accompanying drawing the embodiment of the present invention is described in detail: present embodiment implements under the premise of the technical scheme of the present invention, has provided detailed implementation mode and specific operation process, but protection scope of the present invention is not limited to following implementation example.
[0048] Such as figure 1 As shown, taking a 300MW thermal power plant as an example, the steam-water system of the natural circulation boiler has three parts: the downcomer, the water wall and the steam drum. Corresponding heat value Q of water-cooled wall at time t+Δt, t+2Δt, ... t+nΔt dt , Q d(t+Δt) , Q d(t+2Δt) ,...,Q d(t+nΔt) , and plot the water wall heat measurement Q dτ Trend curves that change over time. Realize the soft-sensing method of heat absorption of boiler water wall based on mass and energy conservation of steam-water system. The boiler model is HG-1025 / 17.3-WM18, the boi...
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The invention relates to a method for measuring heat absorbed by a boiler water cooled wall in real time in the technical field of boiler systems, which comprises the following steps of: 1, obtaining boiler parameters according to the operating standard of a boiler; 2, figuring out a trend curve of heat measured values Qdr changing with the time under the time t by using an IF97 formula; 3, figuring out the proportion of steam to water in a steam pocket and the water cooled wall by using a steam pocket water level model and a water cooled wall steam-liquid recycle ratio model, figuring out the flow and the enthalpy value of a working medium in an outlet of a descending pipe; and 4, figuring out a steam pocket inertia constant Ip by using the steam pocket model, and figuring out the heat absorption real-time measured value Q of the water cooled wall. The invention can be used for one-line measurement on the heat absorption capacity of the water cooled wall of a power plane, and can also be used for on-line recognition of coal heat value and real-time measurement of the boil efficiency.
Description
technical field [0001] The invention relates to a measurement method in the technical field of boiler systems, in particular to a real-time measurement method for the heat absorbed by a water-cooled wall of a boiler. Background technique [0002] At present, the main method for measuring the heat absorption of the water-cooled wall of the thermal power plant boiler is to calculate based on the radiation heat transfer model. For example, Zhang Tengfei and others published the article "Mathematical Model and Simulation of Furnace Radiation Heat Transfer" in "Journal of China Electrical Engineering Society" (October 2003, Volume 23, No. 10, Page 215-219), proposing a method based on radiation heat transfer Mathematical model of water wall heat measurement method. It is based on the imaginary surface model of radiation heat transfer calculation, establishes the lumped parameter model of heat transfer in the furnace, derives the matrix expression for calculating the effective ra...
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IPC IPC(8): G01K17/06
Inventor 袁景淇蔡惟张锐锋陈宇于彤惠兆宇王旭辉葛翔宇潘轶彪朱凯
Owner SHANGHAI JIAOTONG UNIV