Temperature control issue of coal tar during heating in a tubular furnace
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The temperature control of coal tar during heating in a tubular furnace is achieved by controlling the flow rate of the combustion gas entering the furnace. Does the flow rate of the air used for combustion need to change as well? I don’t see any method in the process to control the air supply to the tubular furnace? Could controlling the flow rate of the combustion gas alone lead to incomplete combustion? Or excess air? I have never seen a tubular furnace, and I don’t know much about its combustion control. Please help me understand it.
It is recommended to communicate more with those in charge of the process, as this helps to determine the control parameters more accurately.
In the combustion process, the ratio between fuel and oxidizer must be taken into account. There are several methods for controlling this ratio in order to achieve complete combustion. As for the specific conveying and combustion processes, it depends on how the process and equipment are designed.
As far as I know, cascade control is used quite often. The secondary circuit controls the furnace temperature, while the primary circuit controls the outlet temperature of the material. The control execution object is the gas flow rate. There is no need to control the air flow; there is a flap at the bottom of the furnace, and the color of the flame can be observed manually to make adjustments, after which no further action is required. This post was last edited by shirley63 on 2009-4-15 12:38.]
Simple temperature control makes it difficult to achieve precise control. Because the temperature itself has a large lag, coupled with a large lag in process capacity, it is simply impossible to achieve accurate control. Generally, cascade control of flow and temperature is employed: the main loop is used for temperature control, while the secondary loop is used for flow control. The secondary loop can quickly overcome disturbances caused by fluctuations in gas flow, thereby ensuring stable gas flow; meanwhile, the other disturbances in the main loop allow for precise temperature control. Our factory uses this method to control the temperature of a section of the furnace. As for the fuel-to-air ratio, air is generally supplied in excess to ensure complete combustion.