Fusing Furnace Cooling System: Troubleshooting Manual For Leaks/Blockages/Pump Failures

Fusing Furnace The cooling system mainly cools down the induction coil, power cabinet, water-cooled cables, transformer and key components of the furnace body to prevent overheating from causing performance degradation or damage to parts.
As frit furnaces develop towards higher power and higher efficiency, the importance of the cooling system continues to increase. Establishing a comprehensive fault diagnosis mechanism and daily maintenance system is of great significance for ensuring the long-term stable operation of the equipment

I. Product Overview

The operating temperature of a furnace is typically between 1350℃ and 1600℃. At such high temperatures, the cooling system is not just an aid, but its lifeline. Critical components such as induction coils, furnace flanges, and silicon molybdenum rod electrodes all rely on circulating water to remove heat. If the cooling system malfunctions, the furnace temperature can spiral out of control within minutes, leading to cracked refractory materials, burnt electrodes, or even the complete failure of the furnace.

Common cooling system failures fall into three categories: leakage, blockage, and pump failure. Leaks reduce water flow and cause localized overheating of the furnace; blockages reduce flow and cause uneven cooling; pump failure directly interrupts the entire circulation process. These three types of failures account for over 80% of cooling system problems. This article provides complete troubleshooting steps and emergency handling methods from an on-site operational perspective.

II. Product Features and Advantages

1. Closed-Loop Circulation Cooling Design, Stable Water Quality

Industrial-grade fused furnaces typically employ closed-loop circulation cooling systems. Cooling water circulates repeatedly within the pipes, preventing contact with outside air and reducing oxygen dissolution and dust contamination. The water quality in a closed-loop system remains stable over the long term, with significantly lower scaling and corrosion rates compared to open-loop systems. The system is equipped with an expansion tank to accommodate thermal expansion and contraction and provide stable suction pressure for the pump.

2. Multi-Point Temperature and Flow Monitoring, Early Anomaly Detection

Modern furnace cooling systems are equipped with flow switches and temperature sensors on each critical branch. Parameters such as the return water temperature of the induction coil, the cooling water flow rate of the electrodes, and the furnace flange temperature are displayed in real time on the control panel. If the return water temperature exceeds the set value (typically 45℃–50℃) or the flow rate falls below the lower limit, the system will automatically alarm and record the fault.

3. Dual Pumps for Mutual Backup, Seamless Switching

Medium and large-sized furnaces are typically equipped with two cooling water pumps, one for operation and one as a backup. If the main pump fails or the water pressure drops, the backup pump automatically starts, with a switching time of no more than 3 artículos de segunda clase. The dual pumps, along with the electric valves, can also be rotated periodically, extending the pumps’ lifespan.

4. Stainless Steel Piping for Corrosion Resistance

The piping and joints of the fused furnace cooling system are preferably made of 304 or 316 stainless steel, rather than ordinary galvanized pipes or carbon steel pipes. Stainless steel has a much stronger resistance to electrochemical corrosion and high-temperature water corrosion, making it particularly suitable for handling circulating water containing impurities or with fluctuating pH. Flexible hoses are used for connections in critical areas, facilitating disassembly and maintenance while also reducing vibration and noise.

5. Automatic Water Replenishment and Low Water Level Protection

The expansion tank is equipped with an automatic water replenishment valve and a level switch. Soft water is automatically replenished when the water level falls below the set value; if the level drops to the minimum safety line, the system will shut down automatically, and an audible and visual alarm will sound.

III. Two Core Product Topics

1. Common Faults and Troubleshooting Methods for Fusing Furnace Cooling Systems

Cooling system faults mainly focus on three aspects: leakage, blockage, and abnormal circulation pump operation. Loose pipe joints, aging or corroded seals can easily cause cooling water leakage; during long-term use, scale and impurity buildup can cause pipe blockage, leading to a decrease in cooling water flow; while impeller wear, motor failure, or abnormal power supply in the circulation pump can cause the circulation system to stop working.

In actual troubleshooting, operators can first visually inspect and conduct equipment inspections to observe for leaks, water pressure drops, abnormal vibrations, or unusual noises. Then, use instruments such as thermometers, pressure gauges, and flow meters to check system operating parameters to determine if there are insufficient flow or abnormal heat dissipation problems. For equipment that operates for extended periods, filters and heat exchangers should also be checked regularly to prevent blockages that could reduce cooling efficiency.

Timely detection and handling of these potential problems can effectively prevent equipment overheating, shutdowns, and even damage to critical components.

2. How to Reduce Cooling System Failure Rate

Compared to post-failure repair, preventative maintenance can save companies more costs. Most cooling system failures are related to insufficient routine maintenance, with water quality management being particularly critical. Minerals and impurities in cooling water easily form scale, which, over time, reduces heat exchange efficiency and accelerates equipment corrosion.

Companies should establish a regular inspection system to maintain circulating pumps, cooling pipes, valves, heat exchangers, and sensors. Simultaneously, the hardness, pH, and conductivity of the cooling water should be tested regularly, and water treatment or replacement of the cooling medium should be performed when necessary.

IV. Product Applications

• Large-scale continuous production fusing furnaces:A frit production line with a daily output of more than 20 tons usually operates continuously throughout the year.
• Retrofitting old fusing furnaces: Many factories’ fusing furnaces, after 5-10 years of use, suffer from severe scaling and frequent blockages in the cooling pipes. Online chemical cleaning (injecting citric acid solution and circulating it for 24 hours) can restore over 80% of the flow rate and extend equipment life by 2-3 years.
• High-temperature summer periods: When the ambient temperature is high, the cooling tower’s heat dissipation effect will be poor, and the return water temperature will easily exceed the standard.
• Power outage emergency: If the fusing furnace cooling water pump relies on mains power, immediately manually activate the backup water source (high-level water tank, fire hydrant, or industrial tap water) after a power outage. The furnace temperature will continue to rise for 15-20 minutes after a power outage, and without cooling water, the coil may burn out.

V.Supplier

Luoyang Anjing equipo inteligente Co., Limitado. es una empresa dedicada a la investigación, desarrollo, producción, ventas, y servicios técnicos de equipos de tratamiento térmico como hornos eléctricos de alta temperatura.. Producimos laboratorio, vacío, industrial, y horno de media frecuencia, cubriendo un rango de temperatura de -100 ℃ a 2600 ℃, sirviendo a industrias como las de nuevas energías, semiconductores, y materiales avanzados. Podemos proporcionar soluciones personalizadas basadas en una atmósfera específica., temperatura ultra alta, y requisitos del sistema de control inteligente. Por favor no dude en contactarnos si está interesado.