Introduction  Because of the high temperature, high dust content and high corrodibility of the flue gas produced by incinerators, easy damage of the thermocouple for measurement of furnace flue gas temperature, and high maintenance cost. This paper explores ways to improve furnace flue gas temperature measurement.

  Method  Firstly, this paper introduced two advanced furnace flue gas temperature measurement methods based on infrared technology, the principle of infrared temperature measurement and bicolorimetry temperature measurement was analyzed, and then the structure and practical application of infrared and colorimetry temperature measurement device were introduced, and the technical comparison was made in detail.

  Result  The infrared and colorimetric method temperature measurement device can be used for the furnace flue gas temperature measurement of refuse incinerators, and can be used for the combustion optimization of refuse incinerators and the ammonia injection optimization of the SNCR system through further research.

  Conclusion  With the application and promotion of the new measuring device, its reliability and accuracy have been improved and verified, and it has a good application prospect.