Ultrasonic flight time detection method for power station boiler temperature measurement under multipath condition
A time-of-flight and power station boiler technology, applied in the field of signal processing, can solve problems such as easy to generate errors, consume a lot of manpower and material resources, and affect the working efficiency of boilers, so as to achieve the effect of reducing manpower and material resources and improving work efficiency
Pending Publication Date: 2021-01-12
SHANGHAI DIANJI UNIV
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Problems solved by technology
[0003] The existing contact temperature measurement method consumes a lot of manpower and material resources, and requires the staff to work in high-noise and high-intensity operations for a long time, which seriously affects the health of the staff
And there is an obvious multipath delay effect inside the boiler. The signal received by the receiver is composed of the source signal and its various echoes. At the same time, there are various noise interferences. The measured temperature cannot accurately reflect The real-time temperature in the furnace is prone to errors and affects the working efficiency of the boiler
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[0018] like figure 1 As shown, the embodiment of the present invention provides a method for detecting the time-of-flight of ultrasonic waves under multi-path conditions for temperature measurement of utility boilers. It is used to improve the accuracy of temperature measurement in the furnace and improve the working efficiency of the boiler.
[0019] In a large boiler, the biggest feature of the signal and noise is the obvious spike, so the Gaussian noise model cannot be used to describe this process, and the Alpha stable distribution can be used to describe these signals and noise. Since the Alpha stable distribution does not have finite second-order statistics, time delay estimation algorithms based on finite second-order statistics cannot be used.
[0020] In the method of this embodiment, in order to measure the real-time temperature in the furnace more accurately, the use of multipath time delay algorithm under the condition of fractional low-order Alpha stable distribu...
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The invention discloses an ultrasonic flight time detection method for power station boiler temperature measurement under a multipath condition. The method comprises the following steps: decomposing observation data r (t) into a component form; and initializing each parameter, and performing iteration by adopting an EM algorithm until the parameters converge. According to the method, Alpha stabledistribution is adopted to describe signals and noise in the large boiler, an EM multipath time delay algorithm is adopted to process observation data, and a correct time delay estimation value can beobtained, so that the temperature condition in the boiler is better known, a large amount of manpower and material resources are reduced, and the working efficiency of the boiler is improved.
Description
technical field [0001] The invention belongs to the field of signal processing, and in particular relates to an ultrasonic flight time detection method under multi-path conditions for temperature measurement of power plant boilers. Background technique [0002] At present, the temperature measurement system of large-scale power plant boilers in my country is still relatively backward. The traditional contact measurement method is single-point measurement, which is not only not suitable for the working environment of the boiler, but also cannot quickly rebuild the temperature field in the boiler, and cannot realize the temperature control of the boiler. real-time monitoring. As a non-contact temperature measurement technology, acoustic temperature measurement can monitor the temperature in the furnace in real time, which can reduce the consumption of manpower and material resources. [0003] The existing contact temperature measurement method consumes a lot of manpower and ma...
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Login to View More IPC IPC(8): G01K11/24
CPCG01K11/24
Inventor 王免免刘文红
Owner SHANGHAI DIANJI UNIV