Hybrid Furnace
What is a Hybrid Furnace?
A hybrid furnace is a specialized glass melting tank that combines different heating systems within a holistic furnace concept. In industrial practice, this primarily involves the synergistic combination of classic gas heating with modern electric heating elements.
The strategic goal of this approach is to specifically leverage the specific advantages of both energy sources. This allows the melting process to be highly flexibly adapted to technical requirements, fluctuating energy prices, and increasingly stringent regulatory frameworks.
Unlike purely gas-heated glass tanks, hybrid technology enables additional electrical energy input, which primarily serves to stabilize and precisely fine-tune the temperature profile. Compared to fully electric systems, it offers the decisive advantage that the existing gas-based infrastructure can continue to be used. This makes the hybrid furnace an ideal bridge technology to gradually and economically secure the transition to low-CO₂ melting processes.
Hybrid furnace from the inside
// IWG Glasofenbau
Gas and Electrically Heated Hybrid Furnaces
In this classic hybrid concept, gaseous firing continues to provide a significant portion of the thermal energy. The integrated electric heating elements are specifically used to optimize glass quality through precise temperature control in the melt.
This configuration allows for flexible load distribution: depending on the availability or price development of the energy sources, the electrical share can be successively adjusted. Especially for modernization projects (full repairs), this is an attractive way to reduce CO₂ emissions without having to fundamentally abandon the proven plant layout.
In addition, the targeted placement of electrodes enables precise control of glass bath convection, which significantly improves the homogenization of the melt. This thermal stability minimizes wear on the refractory material at the bottom and side walls, which can extend the campaign life of the plant.
Technical Glass
C-Glass, E-Glass, Borosilicate Glass, Neutral Glass, Sodium Silicate Glass, Display Glass and Glass Ceramic
Tableware
Crystal Glass, Borosilicate Glass, Soda-Lime Glass, Crystal Glass
Glass Containers
Soda-Lime Glass, Borosilicate Glass
Glass Conditioning
Forehearths for various glass types
Glass Conditioning
Platinum Feeder System
Oxy-Fuel and Electrically Heated Hybrid Furnaces
This technologically advanced variant combines oxygen-supported combustion with additional electric heating. By using pure oxygen instead of ambient air, the nitrogen ballast is eliminated, leading to significantly higher flame temperatures and reduced exhaust gas volume.
The supplementary electric heating ensures homogeneous heat distribution deep within the glass bath. This concept is characterized by maximum energy efficiency and is preferably used where the highest glass quality is to be produced in a limited space.
Furthermore, the elimination of nitrogen massively reduces the formation of thermal nitrogen oxides (NOx), often allowing for smaller exhaust gas treatment systems. The combination of both systems also permits an exceptionally compact design of the melting tank, as the specific melting capacity per square meter of surface area drastically increases due to the concentrated energy supply.
Technical Glass
C-Glass, E-Glass, Borosilicate Glass, Neutral Glass, Sodium Silicate Glass, Display Glass and Glass Ceramic
Tableware
Crystal Glass, Borosilicate Glass, Soda-Lime Glass, Crystal Glass
Glass Containers
Soda-Lime Glass, Borosilicate Glass
Glass Conditioning
Forehearths for various glass types
Glass Conditioning
Platinum Feeder System
Can Hybrid Furnaces Be Customized?
A decisive advantage of hybrid furnaces is their high compatibility with existing plant components. They can be designed in such a way that proven systems such as bubbling systems, exhaust systems, feeders, as well as cooling and control devices can either be directly reused or specifically adapted with minimal effort.
Particularly in modernization projects (brownfield projects), we at IWG Glasofenbau place great importance on precisely aligning the hybrid furnace structurally and control-technically with the existing infrastructure. This not only minimizes the necessary interventions in the building structure but also significantly reduces initial investment costs.
Furthermore, this concept enables a gradual electrification of the melting process. Instead of having to convert the entire operation in a risky large-scale project, existing systems can be successively expanded or supplemented with additional electrical components. This modular approach ensures that investments remain predictable over several campaigns and that the transformation process towards CO₂-low production can take place without lengthy operational interruptions. IWG Glasofenbau integrates these strategic aspects deeply into the planning phase to guarantee technical compatibility and long-term operational reliability over the entire lifecycle of the plant.
Conditioning
Piston, screw, and custom-adapted batch charger solutions
Equipment
Fuel Heating Technology
Equipment
E-Boosting
Equipment
Air Cooling
Equipment
Furnace Pressure Measurement
Equipment
Bubbling
Equipment
Glass Level Measurement
Equipment
Control and Measurement Technology
Equipment
Drainage System
The Fundamental Difference: Electric Boosting vs. Hybrid Furnace
It is important to distinguish between a simple boosting system and a true hybrid furnace. Electrical boosting merely functions as a supportive additional technology for an existing gas furnace. It serves to compensate for localized temperature deficits or to temporarily increase melting capacity, while the primary dependence on gas remains.
The hybrid furnace, on the other hand, is designed from the ground up as an integral system. Here, gas and electricity are structurally and control-technically equal partners. Electrical heating is firmly integrated into the process control and designed to play a significant role throughout the entire lifecycle of the plant.
The Differences in Direct Comparison:
- Strategic Role: While boosting selectively optimizes an existing plant, the hybrid furnace serves as the basis for a complete transformation of melting technology.
- Energy Share: In boosting, the electricity share usually remains low (supplementary heating); in the hybrid furnace, both energy sources are equivalent and flexibly controllable.
- Plant Design: Hybrid furnaces are structurally prepared for high electrical loads (e.g., special electrode arrangement and bottom cooling), which is often only possible to a limited extent with standard gas furnaces with boosting.
- Future-Proofing: The hybrid furnace allows for a successive increase in the electricity share over several campaigns, whereas boosting reaches its technological limits as soon as gas is no longer intended to be the main energy source.
Thus, while electrical boosting represents a reactive measure for efficiency improvement, the hybrid furnace functions as a proactive foundation for companies that want to secure their production capacities independently of fossil fuel markets.
Advantages and Limitations of Hybrid Melting Technology
The use of hybrid furnaces offers significant advantages in modern process management. A central aspect is economic resilience: thanks to high flexibility in the choice of energy sources, operators can react dynamically to price fluctuations in the gas and electricity markets, thereby actively optimizing their operating costs. From a technological perspective, precise electrical control leads to significantly more stable melt homogeneity, which particularly minimizes the reject rate and increases product quality for demanding glass types. Furthermore, the hybrid concept enables a long-term, risk-minimized decarbonization strategy: since the electrical proportion can be increased over several campaigns, investments remain scalable and align with the actual progress of local infrastructure development.
Your Advantages at a Glance:
- Cost Efficiency: Dynamic reaction to fluctuating energy prices (gas/electricity).
- Quality Assurance: Higher homogeneity through precise electrical temperature control.
- Predictability: Scalable investments through gradual electrification.
By combining heating media, the thermal inertia of the furnace is also reduced, allowing for faster adjustments during product changes or throughput variations.
Technical Limitations and Infrastructural Requirements
At the same time, however, the technical and operational limits must also be considered transparently. The system complexity of a hybrid furnace is significantly higher compared to conventional, purely gas-heated furnaces. This places increased demands on control and regulation technology as well as on operating personnel, who must be trained to handle high-performance electrical heating components. Another critical factor is site-specific economic viability:
The advantages of a hybrid furnace can only be fully exploited where a sufficiently dimensioned grid connection is available or can be realized in a timely manner. Furthermore, the integration of different heating systems requires precise coordination of refractory materials, as the altered thermal load and flow dynamics in the glass melt must be obligatorily considered during material selection. Hybrid furnaces are therefore not a universal \"plug-and-play\" replacement, but a highly specialized solution whose success is closely linked to a thorough site analysis and a clear long-term transformation strategy.
Factors to Consider:
- Complexity: Higher demands on sensor technology, control, and personnel expertise.
- Infrastructure: Necessity of a powerful on-site electrical grid connection.
- Material Stress: Special requirements for refractory materials due to altered glass melt convection.
Additionally, electrical safety technology (e.g., grounding concepts and insulation monitoring) must be designed significantly more elaborately than for standard furnaces due to the high voltages in the melting area.
Super-Hybrid Furnaces as a Further Development of Hybrid Melting Concepts
Super-hybrid furnaces represent the consistent further development of classic hybrid concepts and are optimized for a massively increased electrical heating proportion. While in standard hybrid furnaces the fossil and electrical energy input often still maintain a balanced ratio, in super-hybrid systems the focus shifts drastically in favor of electricity.
The fundamental technological principle is to maintain the operational flexibility of hybrid heating while minimizing dependence on fossil fuels. In this scenario, electric heating takes on the main share of melting capacity, while gaseous energy sources are used only supplementarily for specific process phases or for top heat support. A decisive future advantage: The remaining gas infrastructure can be converted to CO₂-free gases such as hydrogen or biogenic methane in the long term without system disruption.
Strategic Relevance for Modern Production Sites
The Super-Hybrid furnace is the ideal solution for locations pursuing the following goals:
- Maximum Emission Reduction: Significant reduction of energy-related CO₂ values while maintaining process stability.
- Infrastructural Bridge: Perfectly suited for plants where 100% electrification is not yet technically or grid-wise feasible.
- Investment Security: The concept offers maximum flexibility for long-term plant strategy, as it can be modularly adapted to the availability of green energy over several campaigns.
Designed as a \"High-Electric\" system, the Super-Hybrid furnace forms a robust technological bridge between today\'s melting processes and the fully electric glass furnaces of the future.
IWG Glasofenbau already considers these stages of evolution in the initial planning phase. We develop systems that not only meet today\'s requirements but are already prepared for the energy conditions of the next decades.
Modernization of Existing Hybrid Systems
Existing hybrid systems offer an excellent basis for technological upgrades. Since the basic infrastructure for various energy sources is already in place, modernizations can be implemented in a targeted manner without having to attack the core structure of the glass furnace. The focus here is primarily on increasing the performance of the electrical components and implementing state-of-the-art control and regulation technology.
The Advantages of Targeted Modernization by IWG Glasofenbau:
- Future-proof Adaptation: Increasing the degree of electrification and connecting to modern energy infrastructures to meet new regulatory CO₂ requirements.
- Maximum Resource Efficiency: Existing exhaust, feeder, and bubbling systems (plumbing) can often be adopted or optimized with little effort.
- Minimized Downtime: Through modular planning, measures can be implemented campaign by campaign, reducing downtime to an absolute minimum.
- Predictable Investments (CAPEX): Instead of a risky complete new build, we enable gradual modernization that is perfectly aligned with your site\'s long-term strategy.
Hybrid Furnace from IWG Glasofenbau
The realization of efficient hybrid and super-hybrid furnaces requires in-depth expertise in melting technology as well as a precise understanding of modern plant structures. IWG Glasofenbau supports you holistically – from the first technical analysis and conceptual planning to final implementation during ongoing operation.
We consider heating concepts, energy infrastructure, and control technology as an inseparable unit to guarantee maximum process reliability while ensuring optimal economic efficiency. Whether for a complete new build or the gradual modernization of your existing plants: Our solutions are consistently designed to make your production site technologically flexible and fit for global decarbonization in the long term.