An overview and the recent advancement of combustion applied to glass melting furnaces

The glass industry plays a pivotal role in modern manufacturing, providing essential materials for a multitude of applications ranging from construction to consumer goods. However, the substantial energy demands, primarily driven by the intense heat required to melt raw materials within furnaces, pose significant challenges. Traditionally, thermal energy is sourced from combustion processes in dedicated chambers. Yet, in the pursuit of efficiency and environmental sustainability, there is a growing preference for integrated systems. Notably, the utilization of electrode installations within glass baths emerges as a promising choice for direct melting augmentation through electricity in a more efficient way. This study introduces a sophisticated computational fluid dynamics (CFD) model, developed by the authors, tailored to simulate the real operation of a glass furnace. The model fully couples the reactive flow in the combustion space (the furnace) with convective motions within the glass tank including the effect of the electrodes. By changing the thermal energy from combustion with varying levels of electrode operation (keeping the same overall heat flux to the glass), the furnace behaviour is investigated. The research specifically examines the effects of electrode operation on crucial furnace parameters, including flame heat release and convective motions inside the glass bath, across different scenarios. Insights are gained into the complex interplay between electrode operation, thermal dynamics, and glass quality within the furnace environment. The findings of this study not only deepen the understanding of fundamental processes within glass manufacturing but also offer actionable insights for industry stakeholders. By elucidating the intricate relationship between electrode operation and glass melting process, this research provides practical guidance for optimizing furnace design and operation, enhancing efficiency and CO2 reduction, with the same product quality, in the glass industry.

Purpose The purpose of this study is to evaluate the resource utilization efficiency and export performance of countries in the glass and glassware industry, a sector of increasing importance due to sustainability concerns. By focusing on key raw materials used in glass production, this study aims to provide a comparative analysis of countries during the period 2018–2022, a time marked by significant macroeconomic disruptions such as the trade wars. This study also highlights the importance of efficient resource management in the global glass industry, especially in relation to low-carbon production and international trade. Design/methodology/approach This study provides an innovative evaluation of export performance and raw material dependency in the glass and glassware industry across countries, using advanced multi-criteria decision-making (MCDM) methods: logarithmic percentage change-driven objective weighting, multiple criteria ranking by alternative trace, ranking the alternatives by perimeter similarity, ranking by alternatives median similarity and ranking the alternatives based on the trace to median index. These methods enable a comprehensive analysis of national data, including raw material availability, export capacity and trade dynamics. By integrating these techniques, this study presents a nuanced assessment of how countries navigate critical raw material dependency while maintaining export competitiveness. This approach yields valuable insights into the strategic positioning of nations within this essential global industry. Findings This study highlights the strong performance of Türkiye, Poland, India and Spain in the glass industry. Türkiye’s advantage lies in its abundant raw materials, meeting nearly all domestic demand. Poland benefits from its growing production capacity and local silica sand resources, while India’s long history of glass production and proximity to ore-rich regions enhance its competitiveness. Spain’s recent improvements are linked to macroeconomic factors. In contrast, countries like China, Germany and Japan show lower rankings due to higher raw material consumption. Despite being major producers, their reliance on intensive raw materials affects their overall performance in the industry. Originality/value This study brings a unique perspective to the glass and glassware industry by providing a comprehensive evaluation of countries based on their resource utilization and export performance. Unlike previous research, which primarily focuses on production volumes, this study incorporates both the availability of raw materials and the efficiency of their use, offering a more holistic view of national performance. By using innovative MCDM methods, this research goes beyond traditional metrics. In addition, this study emphasizes the growing significance of macroeconomic factors and raw material proximity, contributing new insights to the strategic positioning of countries within the global glass industry.

This chapter documents the Chinese glass industry’s growth and subsidies from 2004-2008. In 2009, with 31 percent of global production, China was the world’s largest producer of glass and glass products, had the greatest number of glass-producing enterprises, and the largest number of float-glass production lines. China was also the largest glass consumer. Since 2003, Chinese glass production had doubled; production capacity had also doubled since 2003 and increased threefold since 2000. China’s glass industry enjoyed no economies of scale or scope and displayed geographic fragmentation, with manufacturers in 29 of the 32 provinces. Analysis took place at the flat-glass sector that received $4.8 billion in subsidies from 2004-2008. Extrapolating to the glass industry, China’s glass and glass-products industry received at least $30.3 billion in subsidies from 2004-2008, including to heavy oil, coal, electricity, and soda ash, reaching 35 percent of gross industrial output value of glass in 2008.

The glass industry is a significant source of greenhouse gas emissions due to its energy consumption profile and the use of fossil fuels in the manufacturing process. Most of the energy to produce glass is consumed in the process of treating raw materials to elevated temperatures, usually above 1500°C. Glass manufacturing also generates significant environmental impacts, such as greenhouse gas emissions, air pollution, water consumption, and waste generation. Therefore, improving the sustainability of glass manufacturing is a significant challenge for the industry and society. There are ways to reduce the energy consumption and emissions of glass melting, such as recycling glass, using oxy‐fuel burners, improving furnace insulation and design, and adopting electric melting technologies. These methods can help save energy, lower costs, and enhance the sustainability and environmental footprint of the glass industry. However, the industry faces challenges and barriers, such as technical feasibility, economic viability, capital investment, and market acceptance. More research and development must be invested to improve the energy efficiency and environmental performance of glass melting. The objective of this paper is to provide an overview of the growth glass industry has made over the past 30 years and the remaining challenges for sustainable glass manufacturing with a focus on the fiberglass segment. Sharing of procedural methods, technical approaches, and results can help enable the global glass industry in our future sustainability challenges. The fiberglass segment included a broad technical view including glass chemistry development, product development, new industry codes and standards, melting development, computational fluid dynamic modeling, life cycle assessments, and sustainability goals linked to capital planning. The net result delivered a significant reduction in environmental emissions at the global enterprise scale. The implemented changes have taken decades, significant investments, and resources to plan and develop. Practices reviewed and implemented can help drive collaboration and commonality within the glass industry to achieve sustainability goals. Action is needed now if the glass industry is to meet global government demands of reducing carbon emissions by 55% by 2030 and zero carbon emissions by 2050 in alignment with the Paris Agreement on decarbonization.

This book contains selected peer-reviewed extended papers abstracts of which were presented at the 9th International Conference on Mechanical Engineering, Materials Science and Civil Engineering (ICMEMSCE 2021, December 6-7, 2021, China). The collection represents results of engineering research in materials science and materials processing technologies for modern mechanical engineering and construction.

Glass examiners in forensic laboratories have found it useful to incorporate elemental analysis as part of their routine examination and evaluation of glass evidence. The value of the measurement of major, minor and trace elemental composition of glass for its classification into glass types has been recognised for some time [1–4]. It is usually helpful to be able to classify the questioned glass into one of a number of possible categories, such as sheet (or ‘float’, the name of the process for the manufacture of most sheet glass), container, vehicle window (also made by the float process), vehicle headlamp (a borosilicate glass) or tableware (including leaded glass). One reason for classification is to facilitate the assessment of the association between the questioned and the known fragments by either classifying both as the same type of glass and then applying the appropriate comparison criteria or by eliminating straight away the questioned fragment from originating from the known source. Technological advances in the manufacture of glass and the improved quality control in the glass industry has led to less variability in physical and optical properties between the manufacturers of products and also to less variability between the different plants from the same manufacturer. Through the use of the computer-controlled delivery of raw materials and the sophisticated on-line monitoring of the manufacturing lines, the glass manufacturing industry has aimed to control the differences in density, refractive index, thickness, colour and toughening (tempering) properties. The result of this improved quality in the manufacture of glass has been an industry-wide narrowing in the ranges of physical properties in glasses of the same type. Consequently, the discrimination potential, or the ability to distinguish between glass fragments, has been diminished and the sole reliance on measurements such as density and refractive index can lead to overstating the value of positive ‘matches’. For example, recent studies show that for float glass sampled on three separate occasions over a period of 18 months from the same United States plant, the refractive index was found to be analytically indistinguishable [5] when using a precise method for the measurement of refractive index. Consequently, a number of publications have been

Glass examiners in forensic laboratories have found it useful to incorporate elemental analysis as part of their routine examination and evaluation of glass evidence. The value of the measurement of major, minor and trace elemental composition of glass for its classification into glass types has been recognised for some time [1–4]. It is usually helpful to be able to classify the questioned glass into one of a number of possible categories, such as sheet (or ‘float’, the name of the process for the manufacture of most sheet glass), container, vehicle window (also made by the float process), vehicle headlamp (a borosilicate glass) or tableware (including leaded glass). One reason for classification is to facilitate the assessment of the association between the questioned and the known fragments by either classifying both as the same type of glass and then applying the appropriate comparison criteria or by eliminating straight away the questioned fragment from originating from the known source. Technological advances in the manufacture of glass and the improved quality control in the glass industry has led to less variability in physical and optical properties between the manufacturers of products and also to less variability between the different plants from the same manufacturer. Through the use of the computer-controlled delivery of raw materials and the sophisticated on-line monitoring of the manufacturing lines, the glass manufacturing industry has aimed to control the differences in density, refractive index, thickness, colour and toughening (tempering) properties. The result of this improved quality in the manufacture of glass has been an industry-wide narrowing in the ranges of physical properties in glasses of the same type. Consequently, the discrimination potential, or the ability to distinguish between glass fragments, has been diminished and the sole reliance on measurements such as density and refractive index can lead to overstating the value of positive ‘matches’. For example, recent studies show that for float glass sampled on three separate occasions over a period of 18 months from the same United States plant, the refractive index was found to be analytically indistinguishable [5] when using a precise method for the measurement of refractive index. Consequently, a number of publications have been

The U.S. glass industry is comprised of four primary industry segments--flat glass, container glass, specialty glass, and fiberglass--which together consume $1.6 billion in energy annually. On average, energy costs in the U.S. glass industry account for around 14 percent of total glass production costs. Energy efficiency improvement is an important way to reduce these costs and to increase predictable earnings, especially in times of high energy price volatility. There is a variety of opportunities available at individual plants in the U.S. glass industry to reduce energy consumption in a cost-effective manner. This Energy Guide discusses energy efficiency practices and energy-efficient technologies that can be implemented at the component, process, system, and organizational levels. A discussion of the trends, structure, and energy consumption characteristics of the U.S. glass industry is provided along with a description of the major process steps in glass manufacturing. Expected savings in energy and energy-related costs are given for many energy efficiency measures, based on case study data from real-world applications in glass production facilities and related industries worldwide. Typical measure payback periods and references to further information in the technical literature are also provided, when available. The information in this Energy Guide is intended to help energy and plant managers in the U.S. glass industry reduce energy consumption in a cost-effective manner while maintaining the quality of products manufactured. Further research on the economics of the measures--as well on as their applicability to different production practices--is needed to assess potential implementation of selected technologies at individual plants.

In recent years, the European Union’s legislation about sustainable development has promoted the gradual decarbonization of all industrial sectors, pushing towards the final goal of a carbon-neutral European glass industry in 2050. Moreover, the COVID-19 pandemic, the war in Ukraine and the consequent natural gas supply crisis have led to significant increases in the costs of traditional energy commodities and CO2 emission allowances. In this scenario, the European glass industry, which is both an energy-intensive sector and a large emitter of CO2, needs to reduce its specific energy consumption, change its energy sources and decarbonize its production process. In order to understand and support this metamorphosis of the glass industry, the follwing questions must be answered: are the technologies reported in scientific publications merely theoretical exercises, or can they be adopted by the industry? In what timeframe can they be adopted? The aim of this study is to review consolidated and emerging technologies applicable to the glass industry and investigate which ones can be implemented in the short or medium term to reduce energy consumption and CO2 emissions related to the glass production process. This study is based on a review of the literature, the materials presented in technical conferences and the opinions of interviewed experts. This study showed that the literature is not very substantial, lacking detailed information on technologies and their effects in terms of energy savings or emissions. More information can be found in the proceedings of selected specialist conferences. This study found that, on one hand, some technologies are mature and only adopted when economically viable, and appropriate boundary conditions are available; the state of the art regarding these technologies was already extensively covered in past publications (e.g., cullet pre-heating). On the other hand, there are many promising technologies in the research or testing phase (i.e., steam methane reforming, process electrification, use of hydrogen); in-depth studies about them are limited due to the novelty of the solutions that they propose or not available due to industrial secrecy issues. In addition to periodicals and specialized conferences, interviews were carried out with managers and technicians from industry, as well as technicians from the Italian glass research institute and industrial machinery producers (especially melting furnaces). The interviews represent added value of this publication, useful in helping us to truly understand the state of the art and degree of readiness of the technologies identified. In addition, the production values of the glass industry were studied: our research confirmed that the most important sub-sectors are flat and container glass, as well as the largest glass-producing nations/continents. Finally, a review of specific energy consumption and CO2 emissions indexes was carried out.

The research revolves around : Creativity (product design) through the introduction of a new product or service or improvement of an existing product in order to improve services and meet the needs of the customer, and Technical development (innovation in production methods), through design a new production process or improvement of an existing process, the aim of the first is to introduce a new product and the goal of the second is to obtain a high and continuous level of quality in performance. The glass industry is an important industry in Egypt that requires continuous development to keep pace with the global development and achieve the highest level of production at the lowest cost and high quality achieve sustainability of the product in the domestic and overseas market, the research has tended to how to achieve sustainability of the glass blowing through the benefit of Creativity and technical development Research problem: - weak link between Creativity and technical development, and its impact on the improvement and sustainability of the glass product. Research Objective: - Quality and improvement of the blown glass product through Creativity and development of its techniques. Research goal - The impact of Creativity and continuous technical development on the blown glass product Research hypothesis: - The Creativity and development of the glass product formed by the blowing method has a great impact in improving its quality and achieving a competitive advantage for the product. Research Methodology: Analytical / Experimental

Owens Corning and other glass manufacturers have used oxy-fuel combustion technology successfully in furnaces to reduce emissions, increase throughput, reduce fuel consumption and, depending on the costs of oxygen and fuel, reduce energy costs. The front end of a fiberglass furnace is the refractory channel system that delivers glass from the melter to the forming process. After the melter, it is the second largest user of energy in a fiberglass plant. A consortium of glass companies and suppliers, led by Owens Corning, was formed to develop and demonstrate oxy/fuel combustion technology for the front end of a fiberglass melter, to demonstrate the viability of this energy saving technology to the U.S. glass industry, as a D.O.E. sponsored project. The project goals were to reduce natural gas consumption and CO2 green house gas emissions by 65 to 70% and create net cost savings after the purchase of oxygen to achieve a project payback of less than 2 years. Project results in Jackson, TN included achieving a 56% reduction in gas consumption and CO2 emissions. A subsequent installation in Guelph ON, not impacted by unrelated operational changes in Jackson, achieved a 64% reduction. Using the more accurate 64% reduction in the payback calculation yielded a 2.2 year payback in Jackson. The installation of the demonstration combustion system saves 77,000 DT/yr of natural gas or 77 trillion Btu/yr and eliminates 4500 tons/yr of CO2 emissions. This combustion system is one of several energy and green house gas reduction technologies being adopted by Owens Corning to achieve aggressive goals relating to the company’s global facility environmental footprint.

The glass industry is divided into broad sectors for the manufacture of containers (bottles and jars), flat glass (for architecture and transport glazing), glass fibre (for reinforcement and insulation), domestic glass (kitchen and tableware) and technical glasses (for a host of scientific and industrial uses). Manufacturing processes differ from sector to sector [1, 2]. Technical and commercial developments in glass manufacture over the past, say, forty years have yielded new products, and methods of manufacture have changed dramatically in terms of speed of production, the quality of glass produced and the number of peripheral processes for treating glass. There are many different glass compositions but they fall into a limited number of types which simplifies classification [3]. A composition is developed to meet the requirements of the manufacturing process, the properties required in the use of the end product and the economics of production. Manufacturers’ catalogues show a wide range of products, with compositions which vary from product to product. In the large tonnage sectors (container, flat and domestic) compositions tend to be similar within each sector but there are differences of detail. Glass is manufactured in most technically advanced countries and there is a good deal of international trade. Since glass is a highly durable material, products can remain in use for long periods of time, with church windows providing an extreme example. Samples of glass arising from a particular site or event may therefore possess an easily determined composition be it ancient or modern, domestic or foreign.

The glass industry is considered one of the most important features of the traditional Egyptian handicraft industries, especiallywhat bears the ancient Egyptian heritage, because this heritage has established the foundations and principles of many modernglass technologies such as casting techniques and techniques for reforming glass free, in addition to the aesthetic and heritagevalues it bears distinctive industries that qualify them for Small heritage. In light of globalization and international agreementsand the conquest of Egyptian markets with international glass products that are not commensurate with the Egyptian thought andheritage, there have been no serious scientific attempts to benefit from the ancient Egyptian glass industry, technically andaesthetically, and this is what the research focused on how to revive this heritage, which is distinguished by innovative glasstechniques and methods by forming For traditional glass products such as charms, amulets and utensils, which suit the level ofsmall craftsmanship and reach a high level of quality that is competitive in the global market. From here, the research problemarose in the need to revive the ancient Egyptian glass industry heritage with innovative techniques for heritage glass productssuitable for small heritage industries, leading to the research goal of creating modern technical methods and methods using glasspastes to form glass products to revive the ancient Egyptian glass industry heritage, and for which research appears in the ancientEgyptian glass industry. With the ancient Egyptian glass industry heritage to compete not only at the local Egyptian level but alsoat the global level, the research assumes that by studying and analysing the techniques of the ancient Egyptian glass industry andtaking advantage of the glass paste forming techniques that were reached in previous research. 2 Technological methods andmethods for forming pastes can be devised Glassware carrying the ancient Egyptian glass heritage, such as amulets, medallionsand utensils, which are suitable for small traditional crafts industries. The research has reached some results, including: Theanalysis of the forms and methods of production of ancient Egyptian glass products through historical development can be usedin devising technical methods and methods of forming with glass pastes to form amulets, inlays and utensils

While the glass industry (flat glass, container glass, pressed and blown glass, and insulation fiber glass) has reduced its specific energy use (Btu/ton) by almost 30% since 1972, significant potential for further reduction still remains. State-of-the-art technologies are available which could lead to incremental improvements in glass industry energy productivity; however, these technologies must compete for capital with projects undertaken for other reasons (e.g., capacity expansion, equipment rebuild, labor cost reduction, product quality improvement, or compliance with environmental, health or safety regulations). Narrowing profit margins in the large tonnage segments of the glass industry in recent years and the fact that energy costs represent less than 25% of the value added in glass manufacture have combined to impede the widespread adoption of many state-of-the-art conservation technologies. Savings in energy costs alone have not provided the incentive to justify the capital expenditures required to realize the energy savings. Beyond implementation of state-of-the-art technologies, significant potential energy savings could accrue from advanced technologies which represent a radical departure from current glass making technology. Long-term research and development (R and D) programs, which address the technical and economic barriers associated with advanced, energy-conserving technologies, offer the opportunity to realize this energy-saving potential.

The pursuit of sustainable energy solutions and the enhancement of catalytic processes represent critical fronts in the battle against climate change and the drive towards a greener future. This special issue brings together groundbreaking research that addresses these pivotal areas, highlighting the innovative strides made in catalysis and bioenergy. The articles featured in this issue collectively underscore the importance of advanced material science and chemical engineering in fostering sustainable energy practices. IntroductionThe urgency of combating climate change requires a transition to sustainable energy systems, with advanced catalytic processes playing a crucial role [1]. However, this transition faces significant challenges, including the entrenched reliance on fossil fuels and the need to overcome technical, economic, and infrastructural barriers [2]. One of the foremost challenges is the entrenched reliance on fossil fuels, which are deeply embedded in our industrial and economic systems Where, shifting to renewable resources such as biomass and CO2 requires overcoming significant technical, economic, and infrastructural barriers [3]. Technically, developing efficient and selective catalysts that operate under mild conditions is essential to maximize product yield and minimize waste, while also addressing catalyst stability and resistance to deactivation[4]. Economically, substantial initial investments and comprehensive life cycle assessments are needed to ensure the viability of new catalytic processes [1]. Logistically, integrating these processes into existing industrial frameworks requires strategic planning and policy support. Infrastructurally, transitioning involves significant changes to the energy grid and supply chains, necessitating reliable renewable feedstocks and efficient conversion methods. Interdisciplinary collaboration is vital for addressing these complex challenges. The special issue "Catalytic Production of Sustainable Fuels and Derivatives via Carbon Footprints" highlights advancements in catalytic technologies that reduce carbon emissions and enhance environmental sustainability. Catalysis, historically central to the chemical industry, is evolving to meet sustainability principles by converting renewable resources into valuable products. This issue addresses key challenges and strategies for improving catalytic efficiency and selectivity, contributing to sustainable and economically viable processes. It underscores the importance of advanced material science and chemical engineering in fostering sustainable energy practices, providing both scientific understanding and practical solutions for real-world applications, paving the way for a greener future.Theme and SignificanceOne of the critical questions addressed in this issue is how to improve the efficiency and selectivity of catalysts to maximize the yield of desired products while minimizing by-products and waste. This involves optimizing catalyst composition, structure, and reaction conditions. Another significant issue is the utilization of sustainable feedstocks, such as biomass and CO2, for fuel and chemical production. Research in this issue explores how advanced catalysts can facilitate the efficient conversion of these renewable resources, contributing to a circular economy and reducing carbon emissions. Integrating advanced catalytic processes into existing industrial frameworks poses both opportunities and challenges. Therefore, discussing strategies for scaling up laboratory-scale innovations to industrial applications and addressing economic and logistical considerations is essential. Understanding and mitigating the environmental impact of catalytic processes is paramount. This includes evaluating the life cycle of catalysts, their recyclability, and the overall carbon footprint of the processes they enable. Additionally, the stability and deactivation of catalysts are critical concerns that require innovative solutions to extend catalyst lifetimes and enhance their performance. The complexity of developing sustainable catalytic processes necessitates interdisciplinary collaboration. This issue highlights the integration of insights from material science, chemical engineering, environmental science, and economics to create holistic solutions. Addressing the social and ethical implications of these technologies, such as ensuring equitable access to sustainable energy and minimizing negative impacts on communities, is also crucial for fostering a just energy transition.