Method for measuring flue gas temperature based on sound waves

Abstract

The invention discloses a method for measuring flue gas temperature based on sound waves. The method comprises the following steps: S1, symmetrically mounting a pair of sound wave sounding devices on two side walls of a hearth to be measured on the same plane; s2, the embedded control and detection module controls an electromagnetic valve to be opened; s3, transmitting the sound wave signal to an embedded control and detection module; and S4, the embedded control and detection module transmits the collected signal data to the TSN gateway, and then transmits the signal data to the data processing and analysis platform through the OPCUA network for calculation, and the formula is as follows: the flow velocity of the flue gas is obtained through the propagation velocity difference of sound waves in two directions of the same path. And the three-dimensional flow field of the flue gas space is calculated by using the sound wave velocity difference in two directions of multiple paths, so that the system can continuously operate in a severe environment for a long time, and the reliability of the temperature measurement system is ensured.

Description

technical field [0001] The invention belongs to the technical field of high-temperature flue gas temperature measurement, in particular to a method for measuring flue gas temperature based on sound waves. Background technique [0002] The combustion of petrochemical energy such as coal powder, oil, and natural gas, the resource utilization of the calorific value of industrial waste, and the incineration of domestic waste all require the heat exchange process of the flue gas. The temperature parameters of the flue gas are high and the composition is complex. The flow of the flue gas channel Field, temperature field is an extremely complicated physical process. [0003] The patent number is CN201721825653.9, and the application date is 2017-12-22, which discloses a flue gas temperature measurement device at the furnace outlet. Aiming at the defect that the existing temperature measuring device detects that the flue gas temperature is far from the real flue gas temperature at ...

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Problems solved by technology

[0006] The above-mentioned patent realizes the measurement of the flue gas temperature of the boiler flue by installing a target in the boiler flue and an infrared thermometer outside the boiler flue, and it is not easy to be damaged. However, non-contact flue gas such as infrared and thermal imaging cameras The temperature detection method cannot continuously detect specific areas due to the influence of flue gas flow and dust. The temperature fluctuation range is large, and it is difficult to make effective adjustment strategies for combustion control.

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