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床温是增压流化床（PFB）的关键参数,而接触式测量温度是比较可靠的方法。接触式离不开热电偶,它的测温范围不成问题,关键是其外保护套管的使用寿命。用热电偶测量增压流化床内温度时,对套管的要求较高: ①耐高温（1000～1100℃）,承受压力达7kgf/cm~2。 ②抗腐蚀,因为燃煤介质中含有SO_2、SO_3、Na_2O、K_2O等腐蚀性气体。 ③耐磨损,因为床料粒径为0～6mm的气固两相流,以大于1m/s的流化速度频繁冲蚀着套管的外表面。
Bed temperature is a key parameter of pressurized fluidized bed (PFB), and contact temperature measurement is a more reliable method. Contact is inseparable from the thermocouple, its temperature range is not a problem, the key is the outer life of the protective sleeve. Thermocouple temperature measurement pressurized fluidized bed, the higher requirements of the casing: ① high temperature (1000 ~ 1100 ℃), under pressure up to 7kgf / cm ~ 2. ② anti-corrosion, because coal-fired medium containing SO2, SO3, Na2O, K2O and other corrosive gases. ③ wear-resistant, because the bed material particle size of 0 ~ 6mm gas-solid two-phase flow, fluid velocity greater than 1m / s frequent erosion of the outer surface of the sleeve.