What are the technical indexes of tubular heating furnace?

Time：2022-05-18

Today, let’s share the following technical indicators of the tubular heating furnace:
1. heat load
The total heat transferred to the medium in the pipe per unit time of each heating furnace, unit: W or kj/h. The greater the heat load of the furnace, the greater the production capacity.

2. furnace thermal strength
The total calorific value of fuel combustion divided by the furnace volume is called furnace thermal intensity (also called volume thermal intensity), which represents the heat released by fuel combustion in unit time in unit volume of furnace, and the unit is kj/m3 · h or w/m3. The greater the thermal intensity of the furnace, the more compact the furnace is required to complete the same thermal task.

3. surface thermal strength of furnace tube
The heat transferred per unit furnace tube surface area in unit time is called furnace tube surface heat intensity, and the unit is kj/m2 · h or w/m2. The greater the heat intensity of the furnace tube surface, the smaller the heat transfer area required to complete the same thermal task, the less furnace tubes are used, and the furnace volume and investment can be reduced. It should be noted that the surface thermal strength of furnace tube generally refers to the average value.

4. furnace temperature (also known as fire wall temperature)
Furnace temperature refers to the temperature when the flue gas leaves the radiation chamber and enters the convection chamber. It represents the temperature of flue gas in the furnace and is an important control index in furnace operation.

5. flow rate and pressure drop in the pipe
The lower the velocity of liquid in the tube, the thicker the boundary layer, the smaller the heat transfer coefficient, the higher the tube wall temperature, and the longer the residence time of the medium in the furnace. As a result, the medium is easy to coke and the furnace tube is easy to be damaged. However, the high flow rate increases the pressure drop in the pipe and increases the power consumption of the pipeline system.

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