How to control the temperature of coal tar in tube furnace heating?
Thread Content
The temperature control of coal tar in the tube furnace heating is achieved by controlling the flow rate of the combustion gas entering the tube furnace. Does the combustion air flow need to change accordingly? Didn’t you see a way to control the air entering the tube furnace in the process? Will controlling the flow of combustion gas alone cause insufficient combustion? Or excess air? I have never seen a tube furnace and I don’t know much about its combustion control. Please help me answer it.
The air is also adjusted by the opening size
Strictly speaking, it is controlled by controlling the temperature of the radiation room. There must be excess air, and the general air intake volume. Unless the temperature doesn't rise.
As far as I know, cascade control is used more often. The auxiliary loop controls the furnace temperature, and the main loop controls the outlet temperature of the material. The control execution object is gas flow. There is no need to control the air flow. There is a flap under the stove. You can manually observe the flame color and adjust it manually. You don’t need to move it in the future.
Yes, the oil outlet temperature is controlled by controlling the gas flow, the fuel burning condition is observed through the flame, and the burning condition of the fire is adjusted by adjusting the size of the damper. There is generally excess air
Generally, the furnace temperature at the outlet of the tube furnace is used to automatically control the gas volume. The combustion fan will adjust the air volume according to the gas volume. This is a program set by the manufacturer when leaving the factory.
Using cascade control, the main parameter is the oil outlet temperature, and the auxiliary parameter is the gas flow rate.
By adjusting the amount of gas and air, the temperatures of the radiant section, convection section, and flue of the tube furnace are controlled within a suitable range. The gas volume can be adjusted through the regulating valve installed in the main pipe. The air volume can be adjusted through the air inlet under the tube furnace. In addition, the burner nozzle must be cleaned regularly to prevent clogging. :lol It's just a family thing.
Coal coking furnaces are generally older. The dampers are manually adjusted and there is a lot of natural air. Most of them do not have air preheating. New petrochemical furnaces are much better. After air preheating, they not only have good combustion effects, but also have sufficient atomization and high efficiency when using fuel. At the same time, they can also adjust the air inlet volume with a variable frequency fan as discussed in WYC754020, but it can also be achieved by using fuel alone. If you are interested, you can go to the glass and ceramics industries to see their kiln control and glass liquid path control. Their stability and efficiency are much better than those in the coal tar processing industry, but the equipment is also much more expensive.