Testing device for thermal secondary air thermal state calibration

Abstract

The invention relates to a testing device for thermal secondary air thermal state calibration. The testing device comprises a Pitot tube, a temperature measurement part, an extension tube and a protection tube, in a use state, one end of the Pitot tube is communicated with one end of the extension tube, the protection tube is sleeved outside the Pitot tube, the extension tube and the temperature measurement part, the other end of the Pitot tube extends out of one end of the protection tube, the other end of the extension tube extends out of the other end of the protection tube, and the two ends of the temperature measurement component extend out of the two ends of the protection tube. Because the extension tube is additionally connected to the Pitot tube and protected by the protection tube, the extension length can be flexibly adjusted, the insertion position can be accurately positioned, long-time measurement can be carried out in a high-temperature environment, instrument transportation and field disassembly and assembly are facilitated, field personnel transportation and test operation are facilitated, and the thermal state calibration accuracy of the actual large-scale section thermal secondary air flow is improved.

Description

technical field [0001] The invention relates to the field of flow measurement, in particular to a test device for thermal state calibration of hot secondary air. Background technique [0002] As the capacity level of domestic coal-fired units continues to increase, the size of the secondary air duct continues to increase. The cross-sectional size of the hot secondary air duct for millions of units reaches 6m×5m or more, and the temperature of the hot secondary air at the outlet of the air preheater is above 300°C . [0003] The traditional conventional Pitot tube is welded by two steel pipes. Due to material reasons, the length is about 3.5m, which is difficult to meet the measurement requirements of the equal-section grid method. At the same time, due to the long length of the Pitot tube, it is difficult to transport and prone to bending. This greatly reduces the accuracy of thermal state calibration of hot secondary air flow. Contents of the invention [0004] The purp...

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Problems solved by technology

[0003] The traditional conventional Pitot tube is welded by two steel pipes. Due to material reasons, the length is about 3.5m, which is difficult to meet the measurement requirements of the equal-section grid method. At the same time, due to the long length of the Pitot tube, it is difficult to transport and prone to bending. fold, which greatly reduces the accuracy of the thermal state calibration of the hot secondary air flow

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