Depth requirements for the installation of thermocouples for temperature measurement in power stations-Chemical Instrument Network

　　With the continuous development of China's power industry, there is a growing demand in the market forThermocouples for temperature measurement in power stationsThe demand for power generation is increasing. Starting from market demand, our company has introduced relevant technologies from both domestic and foreign sources. Based on our existing products, we have extensively listened to the opinions of design institutes and power station users, and redesigned our existing products to add new varieties. This has made the entire supporting series of varieties and specifications meet the needs of domestic or imported 300000 and 600000 kilowatt generator sets, as well as other domestic units, and meet the market with excellent quality.

For the installation of thermocouples for temperature measurement in power plants, users should pay attention to the following requirements:

1. In order toThermocouples for temperature measurement in power stationsThere is sufficient heat exchange between the measuring end and the measured medium, and the location of the measuring point should be selected reasonably, avoiding the installation of thermocouples near dead corners of valves, elbows, pipelines, and equipment as much as possible.

2. Thermocouples with protective sleeves suffer from heat transfer and dissipation losses. In order to reduce measurement errors, thermocouples and thermistors should have sufficient insertion depth:

1) For thermocouples used to measure the fluid temperature at the center of a pipeline, their measuring end should generally be inserted into the center of the pipeline (vertically or obliquely installed) If the diameter of the tested fluid pipeline is 200 millimeters, the insertion depth of the thermocouple or thermistor should be selected as 100 millimeters;

2) For temperature measurement of high temperature, high pressure, and high-speed fluids (such as main steam temperature), in order to reduce the resistance of the protective sleeve to the fluid and prevent the protective sleeve from breaking under the action of the fluid, shallow insertion of the protective tube or the use of a hot sleeve thermocouple can be adopted. The depth of insertion of the shallow insertion thermocouple protective sleeve into the main steam pipeline should not be less than 75mm; the standard insertion depth of the hot sleeve thermocouple is 100mm;

3) If it is necessary to measure the temperature of the flue gas inside the flue, even though the diameter of the flue is 4m, a thermocouple or thermistor can be inserted at a depth of 1m; When the insertion depth of the measuring element exceeds 1m, it should be installed vertically as much as possible, or support frames and protective sleeves should be added.

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