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Method for measuring heat absorbed by boiler water cooled wall in real time

A real-time measurement, 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 valid measurement values.

Inactive Publication Date: 2011-04-27
SHANGHAI JIAO TONG 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

Method used

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  • Method for measuring heat absorbed by boiler water cooled wall in real time
  • Method for measuring heat absorbed by boiler water cooled wall in real time
  • Method for measuring heat absorbed by boiler water cooled wall in real time

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Embodiment Construction

[0045] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

[0046] 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. At any operating time τ of the boiler, the real-time measurement method of the heat of the water wall is used, in order of time , respectively measure the corresponding heat value Q of the water-cooled wall at the time τ=t, 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 over tim...

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Abstract

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...

Claims

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Application Information

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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 JIAO TONG UNIV
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