Method for measuring temperature by using non-intruding sound wave and system thereof

Abstract

The invention discloses a method for measuring temperature by using a non-intruding type sound wave. The method comprises the following steps: (1) generating a sound source in a boiler through high pressure gas; (2) receiving a sound wave with a wave guide device and sending the sound wave to a microphone, and amplifying the sound wave through an amplifier; (3) transmitting the above sound wave through a signal cable; (4) accessing the above sound wave to a computer through a data collection card in order to obtain a transmission time t of the sound wave in a hearth of the boiler; (5) calculating a temperature T of the hearth. The invention also discloses a system for measuring temperature by using the non-intruding sound wave. According to the method and the system in the invention, a space temperature distribution state of an internal combustion field of a measured object is determined in real time, and the method and the system have the advantages of a non-intruding type, full automation, no need of daily maintenance, and capability of working stably and reliably for a long time.

Description

technical field [0001] The invention relates to the field of temperature measurement, in particular to a method and system for non-invasive acoustic wave temperature measurement. Background technique [0002] For industrial boilers, the basic requirement for their combustion is to establish and maintain a stable combustion flame. Unstable combustion will not only reduce the thermal efficiency of the boiler, generate pollutants and noise, but also cause fire extinguishing in the boiler furnace in extreme cases. If not handled properly, it will induce deflagration in the furnace and cause safety accidents. In addition, the industrial combustion process has the characteristics of transient changes, random turbulence, large equipment size, and harsh environment. These all bring difficulties to the online measurement of thermophysical field parameters, and it is difficult to obtain thermophysical field parameters that describe the actual combustion process. In particular, the me...

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Problems solved by technology

Unstable combustion will not only reduce the thermal efficiency of the boiler, generate pollutants and noise, but also cause fire in the boiler furnace in extreme cases. If it is not handled properly, it will induce deflagration in the furnace and cause safety accidents

In addition, the industrial combustion process has the characteristics of transient changes, random turbulence, large equipment size, and harsh environment, all of which bring difficulties to the online measurement of the thermophysical quantity field parameters, and it is difficult to obtain the thermophysical quantity field parameters describing the actual combustion process

In particular, the measurement of temperature distribution is very difficult, resulting in no reliable basis for combustion adjustment, and combustion optimization operation cannot be realized

The limitation of traditional temperature measurement methods is that DCS (distributed control system) can only monitor the information of flame presence and absence; flame video can directly observe the furnace flame image, but only provides qualitative flame presence / absence and certain fire There is no quantitative temperature information; the smoke temperature probe only monitors the smoke temperature at the furnace outlet during the start-up process, but cannot complete the monitoring of the full load condition

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