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Yuhua Fused Cast
How to Extend the Service Life of a Glass Furnace
Time：
Aug 04,2026
The key to extending the service life of glass furnaces is Strictly control refractory erosion, stabilize the thermal operating regime, and implement refined maintenance and scientific overhauls. This can extend the kiln’s service life from the conventional 3–5 years to 8–12 years. Below, we present a comprehensive solution across five key dimensions: materials, thermal engineering, operation, maintenance, and overhaul.
I. Refractory Material Selection and Structural Optimization (Foundation for Service Life)
The essence of kiln life is Refractory materials exhibit resistance to erosion, thermal shock, and permeation. Overall performance.
- Precise Material Selection by Zone
- Melting Section / Pool Wall : Selection Electrofused AZS brick (33#/36#/41#), with the strongest resistance to glass melt erosion; use in critical areas No shrinkage cavities, high density High-quality fused cast bricks that minimize the leaching of the glass phase.
- Vault / Breastwork : use High-quality silica brick (SiO₂ > 96%), with dimensional stability and alkali resistance; the top surface can be laminated. Ceramic fiber module , insulates and reduces thermal shock.
- Bottom of the pool : Used on the ground floor Magnesia / Magnesia-chrome brick , upper deck Dense zircon brick or Electrofused AZS layer , leak-proof and resistant to erosion by molten glass.
- Regenerative chamber : For high-temperature areas Magnesia-alumina spinel brick , for the medium- and low-temperature range High-alumina brick , alkali resistance, dust resistance, and thermal cycling.
- Structural and Construction Upgrades
- Adopt Composite furnace lining : The inner layer is dense and erosion-resistant, while the outer layer is lightweight and thermally insulating, reducing heat loss and fluctuations in the outer wall temperature.
- Strict control Expansion joint (3–5 mm), filled with ceramic fibers to prevent cracking of the brick body caused by thermal expansion and contraction.
- Key areas (such as the liquid discharge port and the feed inlet) are made… Thickened / Thickened brick + protective cover Design to enhance local resistance to scour.
- Hammering is prohibited during construction to prevent the formation of microcracks; use Dry-stone masonry + precision mortar , ensuring tight mortar joints.
II. Stable Control of the Thermal Regime (Reducing Thermal Shock)
Severe temperature fluctuations are the primary cause of cracking and spalling in refractory materials.
- Precise temperature control, minimizing fluctuations.
- The temperature fluctuation in the melting section is controlled within ±10℃ Inside, abrupt increases and decreases are strictly prohibited.
- Adopt Oxy-fuel combustion / Top-fired technology , the flame is directed vertically downward to prevent direct scouring of the vault and sidewalls, thereby reducing localized overheating.
- Coordination Electrical fluxing , supplementing the bottom heat to enhance temperature uniformity and reduce the scouring of the glass melt against the tank walls caused by convection.
- Standardize the heating/cooling curve
- New kiln / After overhaul, the temperature rise shall be strictly in accordance with 7–14-day curve Execution, with a focus on control. 573°C (quartz phase transition) and 1200℃ At critical junctions, proceed slowly.
- During planned cold maintenance, according to Cooling curve Cool slowly to avoid thermal shock damage.
- Optimize flame and atmosphere
- Control Air-fuel ratio , avoid a reducing atmosphere (which can erode refractory materials) or an excessively oxidizing environment (which exacerbates alkali volatilization).
- Regularly clean the spray gun and burner to ensure a stable flame, prevent off‑center burning, and avoid flame impingement on the refractory bricks.
III. Raw Materials and Molten Glass Quality Control (Source‑Level Erosion Reduction)
Raw material impurities and the composition of the glass melt directly determine the erosion rate of refractory materials.
- Strictly control raw material purity.
- Reduce in the batch composition Alkali metals (Na₂O, K₂O), sulfur, chlorine Content, reducing chemical erosion of silica bricks and AZS bricks.
- Control Iron, titanium Monitor color‑forming impurities to prevent localized overheating and abnormal glass melt viscosity.
- Stabilizing the composition and viscosity of glass melt
- Ingredient variation ≤ ±0.5% , to prevent abrupt changes in viscosity from exacerbating convective erosion.
- Reasonable control Liquid level height , reducing the erosion of the pool walls caused by liquid surface fluctuations.
- Reduce batch fly and scaling.
- Optimize the feeder to minimize material spillage; regularly clean scale buildup from the vault and sidewalls to prevent localized overheating and alkali accumulation.
IV. Daily Precision Operations and Maintenance (Extending Service Life)
- Establish a three-level inspection system.
- Daily : Check temperature, pressure, flame, liquid level, outer wall temperature, and burner status.
- Weekly : Inspect refractory materials for cracks, spalling, redness, and bulging; clean ash and dust from the flue and heat‑storage chambers.
- Monthly / Quarterly : use Infrared thermography, ultrasonic thickness measurement Perform nondestructive testing to assess the remaining thickness and integrity of the furnace lining.
- Online Monitoring and Early Warning
- Installation Lining temperature, heat flux, and molten glass leakage Monitoring system with automatic anomaly alerts.
- Establish Refractory Material Life Prediction Model , predict the remaining life based on the erosion rate and the number of thermal cycles.
- Standardize procedures to minimize human-induced damage.
- Strictly prohibited Overloaded operation , Frequent load changes; avoid impact of hard objects against the furnace lining.
- Control Stable discharge rate , reducing the erosion of the pool walls caused by the flow of molten glass.
V. Scientific Maintenance and Local Repairs (Avoiding Major Overhauls and Extending Overall Service Life)
- Implement preventive localized maintenance.
- Discover Microcracks, localized corrosion, blistering At that time, immediately adopt Hot‑state patching, ceramic welding repair, and spray coating restoration , to prevent further injury.
- Hot-state repair is preferred. Same material or higher grade Refractory materials, ensuring compatibility.
- Optimize maintenance strategies
- Adopt Partial replacement Rather than a full overhaul, this approach reduces costs and downtime.
- Utilize Low-load period, planned maintenance window Centralized maintenance to prevent unplanned downtime.
- Quality Control for Overhaul Projects
- During major overhauls, thoroughly remove old bricks and inspect the steel structure; new brickwork must be executed in strict accordance with specifications. Dry masonry, wet masonry, expansion joints Standard.
- After overhaul, according to Standard Heating Curve Bake the kiln to ensure the refractory lining is fully stabilized.
VI. Key Technologies and Case Outcomes
- Oxy-fuel combustion + electrical auxiliary melting : The flames do not scorch the bricks, the temperature is uniform, and the kiln’s service life can be extended. 30%-50% 。
- Nano-composite refractory materials : The erosion depth is only that of conventional materials. 30% , significantly enhancing erosion resistance.
- Ceramic Fiber Composite Furnace Lining : The outer wall temperature from 450℃降至 90℃ , reduced heat loss 28% , the kiln age has been extended from 8 years to 12 years.
In summary, extending the service life of glass furnaces is Materials, thermal engineering, operation, maintenance, and overhaul of systems engineering. The core is Control erosion at the source, stabilize thermal processes, perform meticulous maintenance, and carry out timely repairs. , shifting from passive major overhauls to proactive preventive maintenance to ensure long‑term, efficient, and stable kiln operation.
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