Can the pilot light of Duke Company’s sulfur burner be used for drying in low-temperature sections?

It shouldn’t be possible. We have discussed this issue with Duke, but they can provide a dedicated furnace burner for use at low temperatures.

The furnace can be dried at low temperatures; by taking process design into account, the drying temperature can be reduced to between 150 and 200 degrees.

What is the basis for that upstairs? Normally, the pilot light is used only to ignite the main burner, and the drying time at low temperatures is usually around two days. First, can the pilot light maintain a stable combustion over such a long period of time? The second is whether the power of the constant-light lamp meets the requirements for drying at low temperatures ,

1. Under normal circumstances, to achieve the temperature increase at this stage, we use air preheating to do so gradually, ensuring that the temperature reaches above 100°C. 2. To reach temperatures up to 200°C, it is necessary to use a burner to raise the temperature. There is a 15-unit bypass in the gas line of our main burner; with slight adjustments, temperature control can still be maintained. However, air supply at this point is a critical factor – if not managed properly, the burner may go out! 3. Actually, the sulfur unit is not maintained using a pilot light; the heating of the catalytic low-temperature section relies mainly on pilot lights. The Duke burner is similar to the catalytic burner, with the difference probably lying in the material used. Why not?

Based on my experience in driving and working with such systems, during furnace heating, Duke’s FlameEye is calibrated at the factory based on the characteristics of the fuel gas and acidic gases used for combustion; this calibration ensures good performance during normal ignition and operation； It won’t work well for oven drying, especially at low temperatures – the flame is small and the spectral range is narrow. If you want to use it for oven drying, you need to adjust the parameters using software; everyone has this software available, so you can take a look at it yourself. However, since it has an English interface, some experience is required to make the adjustments. There is no issue with it not being usable. I won’t go into details. The settings are related to light sensitivity, temperature sensitivity, safety factors, etc. It cannot be set to be too sensitive, nor can it be set to be too broad.

The temperature range of 100–200°C represents a challenge in furnace drying, as it is difficult to control. The constant-flame burner is not effective, and the main burner’s temperature rises rapidly once it starts burning. In fact, when designing the system, it would be possible to consider using medium-pressure steam to heat the air preheater. This way, the low-temperature section will be much better.