Linear butt welding thermocouple and measurement amending method

Abstract

The invention relates to a line butt-welding thermocouple and a measuring-correcting method. The thermocouple consists of a butt-welding thermocouple wire, thermocouple wire joints, a thin steel wire, a supporting block, fixing bolts, springs and a lead. Two thin steel tubes are fixed on the supporting block through the fixing bolts; wherein, one steel tube acts as a fixing arm and the position of the steel tube keeps unchanged when measuring; the other steel tube acts as a movable arm which can move freely; the upper ends of the fixing arm and the movable arm are respectively provided with the thermocouple wire joints; one end of the thermocouple wire joint is connected with the lead passing through the thin steel tube; two ends of the thermocouple wire are respectively fixed on the thermocouple wire joints by thin bolts; the tail ends of the fixing arm and the movable arm are sheathed with the springs; the measuring error caused by the heat expansion of the thermocouple wire can be removed by the adjustment on the position of the movable arm through the springs. By using the thermocouple to directly measure a flame temperature field, big heat conducting and radiation errors exist; while using the measuring method and a computer correcting procedure of the invention to correct the measuring result of the line butt-welding thermocouple can maximally reduce the error when in the mixing process.

Description

Technical field [0001] The invention relates to the technical field of measuring flame temperature, and is a linear butt welding thermocouple for measuring the flame temperature field and a measurement correction method. The flame temperature field can be accurately measured by the linear butt welding thermocouple and the measurement correction method of the present invention. Background technique [0002] When measuring the flame temperature with a thermocouple, the following problems will be encountered: 1) Radiation error. Due to the high flame temperature, the radiation error of the thermocouple must be corrected. 2) Heat conduction error. In most temperature measurement occasions, as long as the thermocouple is installed properly, the heat conduction error can be ignored. However, due to the large temperature gradient in the flame, the heat conduction error can sometimes be as high as 400°C. Therefore, it must be corrected. Moreover, as a contact measurement, the thermocoupl...

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Problems solved by technology

[0002] The following problems will be encountered when measuring the flame temperature with a thermocouple: 1) radiation error, because the temperature of the flame is very high, the radiation error of the thermocouple must be corrected

Moreover, as a contact measurement, the thermocouple will interfere with the flame flow field during the temperature measurement process.

3) The thermal expansion of the thermocouple wire becomes longer, which makes the thermocouple wire swing under the action of the air flow, resulting in temperature measurement errors

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