The negative pressure control in a pot furnace directly influences the temperature stability of the calcining zone and the burnout rate of volatile matter by regulating the flow states of air and volatile matter. Specifically, excessive negative pressure leads to a decrease in temperature and a decline in burnout rate, while insufficient negative pressure causes temperature fluctuations and incomplete combustion. Here is a detailed analysis:
Impact of Negative Pressure on Temperature Stability in the Calcining Zone
- Excessive Negative Pressure: The air flow rate within the flue increases, leading to heightened heat loss and a subsequent drop in the temperature of the calcining zone. Simultaneously, the flame is elongated, weakening heat transfer intensity and further compromising temperature stability.
- Insufficient Negative Pressure: Difficulty in extracting volatile matter results in inadequate preheated air supply, causing incomplete combustion. This leads to erratic temperature fluctuations in the calcining zone that are challenging to control. Additionally, poor flue gas mobility within the kiln and unstable flames exacerbate temperature variations.
- Ideal Negative Pressure Range: The negative pressure at the top of each furnace chamber should be maintained between 49 and 98 Pa, with the negative pressure inside the pots approaching zero. Within this range, the flow states of air and volatile matter within the flue are optimal, facilitating the maintenance of stable temperatures in the calcining zone.
Impact of Negative Pressure on the Burnout Rate of Volatile Matter
- Excessive Negative Pressure: Volatile matter is drawn into subsequent equipment before complete combustion, resulting in heat loss. This not only reduces the burnout rate but also affects the temperature stability of the calcining zone.
- Insufficient Negative Pressure: Difficulty in extracting volatile matter leads to their accumulation within the kiln. This not only lowers the burnout rate but also poses a risk of explosion and other safety incidents.
- Optimization Measures: Adjusting the opening of the negative pressure pull plate and controlling the flue inlet pressure can optimize the pressure distribution within the flue, enabling volatile matter to combust under optimal conditions and thereby enhancing the burnout rate.
Practical Recommendations for Negative Pressure Control
- Precise Negative Pressure Adjustment: Utilize an automatic negative pressure control system to automatically regulate the opening of the flue negative pressure pull plate based on the negative pressure at the inlet of each first-floor flue. This ensures precise control of the flue inlet pressure, maintains an appropriate flame length within the flue, and enhances the production stability and thermal efficiency of the pot furnace.
- Enhanced Equipment Maintenance: Regularly inspect the condition of fans and clean their blades. Ensure that the damper actuators operate without jamming and provide accurate feedback. Verify the proper functioning of measuring instruments (such as pressure transmitters) and that the sampling tubes are unobstructed.
- Optimization of Operating Parameters: Formulate raw materials reasonably based on their varying physicochemical properties to adjust the volatile matter content. Simultaneously, adjust the negative pressure to an appropriate range according to the calcining temperature requirements and maintain uniform temperature along the longitudinal direction of the furnace body
Post time: Apr-29-2026