How to control the burner of a hollow paddle dryer

1. Regarding the burner of this hollow dryer, its proportional control produces high flame temperature and efficiency, but it is not suitable for many applications, including low-temperature processes. Low-temperature processes typically have range ratios of 20 to 1, 30 to 1, or even higher for heat dissipation requirements. In proportional control systems, the burner is difficult to operate, with heat output range ratios greater than 10 to 1, making it difficult to control the flow rate accurately and repeatably over a wider range.

 

 

3. Gear Ratio Control. This method focuses on the middle ground between efficiency and operating costs, using a gear ratio system. In an excess air system, the control valve on the air and fuel, as the low flame enters the burner, reduces the airflow, but the fuel valve operates in such a way that the fuel flow decreases even faster; this change occurs from high to low.

 

2. Excess Air Control. The problem lies in the fact that burner regulation is not easy, and the expensive control systems have led to the development of excess air systems. With these systems, the burner is set near the fire or at a high accuracy rate, but it can operate as a throttling mechanism for low fire, resulting in increasingly more excess air. The simplest and most popular way to do this is to lock the combustion airflow at a fixed speed and vary only the fuel flow rate. Thousands of these systems are used in cryogenic processes in dryers.