Issues with temperature measurement points in heating furnaces
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It’s a vertical coking heating furnace with radiation and convection chambers. What is the appropriate location for installing thermocouples? Any relevant standards would be helpful; those with experience can also share their insights. I’m still learning...
At least 2 thermocouples must be installed at the radiation top of each furnace. If multiple radiation chambers lead into one convection chamber, at least 1 thermocouple must also be installed at the entrance to that convection chamber; if the convection chamber is long, at least 2 thermocouples are required. Thermocouples should also be installed at the outlet of the convection chamber. If several process media are heated in the convection chamber, thermocouples must also be installed on the flue gas outlet side of each process coil.
The answer is upstairs! Each furnace’s radiation chamber and convection chamber should be equipped with at least two thermocouples each, so as to reflect the temperatures on both sides of the furnace and prevent uneven heating! Additionally, two furnace negative pressure monitors need to be installed at the top and bottom of the convection chamber! Use this to determine whether the convection chamber and chimney are unobstructed! Facilitates the operation of the heating furnace
Where is the furnace temperature measurement point? ? And the wall temperature refers to that temperature. . Is there a temperature measurement point for the flue gas temperature?
Our heating furnace has 6 inlet channels; then how many temperature settings are needed for the furnace chamber, and does it’s necessary to measure the wall temperature for each channel?
In accordance with the Safety Regulations for Heating Furnaces in the Petroleum Industry _ SY0031-2004, 9.5 Measurement Instruments: 9.5.1 Heating furnaces shall be equipped with temperature measurement instruments at least at the inlet and outlet of the medium, at the end of the heat transfer surfaces in the convection section, in the furnace chamber of tubular heating furnaces, and at the fuel inlet to the burner; heating furnaces equipped with air preheaters shall also have temperature measurement instruments at the preheating outlet. The instrument should accurately reflect the medium temperature and be easy to observe and maintain. 9.5.2 The range of temperature measuring instruments with dials should be 1.5 to 3.0 times the normal temperature. 9.5.3 The placement of pressure measurement ports and sampling ports in the heating furnace shall meet the requirements for thermal testing and sampling. 9.5.4 The calibration and maintenance of measuring instruments shall comply with the regulations of the **metrology department, and they should be calibrated once a year after installation. 9.6 Alarm Devices 9.6.1 Heating furnaces that have access to power supply should be equipped with an alarm device to detect the shutdown of the burner. The barrel-type heating furnace should be equipped with a low liquid level alarm for the heating section ； Tubular heating furnaces should be equipped with a furnace over-temperature alarm device.
I'm talking about measuring the flue gas temperature. As for the tube wall temperature, it generally does not need to be measured; if the medium tends to coking, a tube wall thermocouple can be added.