Temperature-controlled heat tracing pitot tube

Abstract

The invention provides a temperature-controlled heat tracing pitot tube, and belongs to the technical field of flue gas detecting equipment. A heating film and an insulating layer successively wrap the outside of each of a whole-pressure measuring tube and a back-pressure measuring tube of the temperature-controlled heat tracing pitot tube, a heat-insulation layer wraps the insulating layer of thewhole-pressure measuring tube and the insulating layer of the back-pressure measuring tube jointly; a protecting shell is arranged on the outside of the heat-insulation layer; at least one temperature probe penetrates through a side wall of the protecting shell and extends into the heat-insulation layer; a measuring end of the temperature probe is close to the portions, which are in contact witheach other, of the insulating layer of the whole-pressure measuring tube and the insulating layer of the back-pressure measuring tube; and the end, which is away from the whole-pressure measuring tube, of a whole-pressure joint, the end, which is away from the back-pressure measuring tube, of a back-pressure joint and the end, which is away from a measuring end, of the temperature probe are connected with an online monitoring instrument. The temperature in the temperature-controlled heat tracing pitot tube can be maintained at 80 DEG C or above, the problem that the pitot tube is corroded dueto condensation is solved, the online monitoring instrument has a blowing function, solid particulate matter impurities in discharged gas can be removed effectively, and the problem of blockage of thepitot tube is solved effectively.

Description

technical field [0001] The invention relates to the technical field of smoke detection equipment, in particular to a temperature-controlled heat tracing pitot tube. Background technique [0002] In smoke detection work, Pitot tube is one of the most commonly used sampling devices in detection sampling equipment. When measuring, insert the pitot tube flowmeter probe into the pipeline, and make the central axis of the full pressure and back pressure probes be in the center of the flow section and in line with the direction of the flow line. And pass it to the monitoring system; at the same time, the back pressure probe measuring hole picks up the throttling static pressure and passes it to the monitoring system. The monitoring system reads the total and static pressure values, calculates the difference between dynamic pressure and static pressure, and applies the formula to calculate flow rate value. [0003] However, because the flue gas contains various gas components, suc...

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Problems solved by technology

[0004] In order to solve the problems existing in the prior art, the object of the present invention is to provide a temperature-controlled heating pitot tube, which can maintain the temperature inside the pitot tube above 80°C and solve the corrosion problem of the pitot tube caused by condensation. Online The monitoring instrument has a purging function, which can effectively remove solid particulate impurities in the exhaust gas, and effectively solve the problem of pitot tube blockage

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