The Research On Acoustic Pyrometer

The security and economy of power station unit operation is directly affected by the furnace combustion status. And an extremely important role for the furnaces control and combustion diagnosis is played by the flame temperature, which is an important parameter reflected for combustion process in furnace. Asa new technology developed in recent years, acoustic thermometry is an effective non-contact measurement method of furnace temperature. As it has high measurement accuracy, wide measurement and space range, continuous and real-time measurement, strong anti-interference ability, easy maintenance, and other advantages, it is especially suitable for the measurement of the furnace temperature in the power station.This article briefly described the theoretical basis of acoustic thermometry, the hardware of temperature measuring system consists and the software design flowchart. Itused the change of distances to simulate the temperature in furnaces under laboratory conditions, analysed system performance, and got a lot of data.It also did temperature-resistant experiments for the sound source device and sound signal receiving device, got the temperature limit, designed the acoustic waveguide to import and export the sound waves to the furnace, and designed acoustic waveguide dual cooling device used for cooling the sound source device and sound signalreceiving device. In general this article has completed the following works:1. Added display circuit of lower position machine, in order to operate and display the measurement result independentlywithout the host computer. Improved the program, added interpolation algorithm, improved measurement of delay time resolution, and expanded the measurement range of system.2. Used the change of distances to simulate the temperature in furnaces under laboratory conditions, compared the performance of the moving coil microphone and piezoelectric microphone, and examined the stability of the system running.3. Got the temperature limit by temperature-resistant experiments for the sound source device and sound signal receiving device,It referenced for the design of acoustic waveguide dual cooling device. 4. Designed the acoustic waveguide to import and export the sound waves to the furnace, and designed acoustic waveguide dual cooling device used for cooling the sound source device and sound signal receiving device. It also gave the assembly diagram on the entire system in industrial field.