Connect with us

Concrete

Design for Solid Alternative Fuels

Published

on

Shares

Kapil Kukreja, Group Manager; Dr D K Panda, Joint Director; and Bharat Bhushan, Project Engineer, National Council for Cement and Building Materials (NCB), Ballabgarh, India, present their findings in an article that delves into the methodology used to tackle the identified issue and discusses the R&D project taken up by NCB that resulted in the creation of an innovative design capable of effectively managing diverse alternative fuels and their combinations.

At COP26, India made a significant commitment by pledging to embrace a low-carbon growth path and to shift half of its energy consumption away from fossil fuels and towards non-fossil alternatives by the close of this decade. Moreover, India has set the ambitious goal of achieving carbon neutrality by the year 2070. To achieve the target of carbon neutrality, alternative fuels (AFs), including biomass, refuse-derived fuel (RDF), used tires, plastic waste and hazardous waste, which have the potential to replace conventional fossil fuels such as coal, pet coke, etc. These AF are seen as promising solutions in line with India’s mission to reach carbon neutrality.
Nonetheless, with the adoption of these AF, challenges were encountered in handling of AF and their mix, encompassing environmental, product quality, logistical issues, health and safety concerns, as well as the intricacies of the processes and operations involved. However, one of the main challenges faced while handling AF used in cement plants is the jamming of the transfer chute.
Chute transfers are vital for material handling but can often become weak links in the chain. These components are used in conveying systems to transfer bulk materials between feeders, screens, and from one conveyor to another or for discharge into burners/pre-calciner. Chute design requires careful attention, as handling AFs with variations in material characteristics or operational requirements can lead to productivity losses and operational disruptions due to jamming or unpredictable chute behaviour.

Problem with chutes
A survey was conducted in the Indian cement industry in the year of 2019-20 to assess the issues related with handling of AFs and their mix. Out of 100 questionnaires distributed, 61 responses were received, providing valuable insights. The survey highlighted that 78.7 per cent of respondents faced transfer chute issues when handling AFs, primarily jamming. The main reasons included using conventional chute designs unsuitable for heterogeneous AFs,
lack of knowledge about material flow and properties, and the unexpected introduction of new materials not considered during chute design. These issues led to significant maintenance efforts and operational disruptions.
One significant cause of chute jamming is the reliance on traditional chute design methods, which have been widely employed in the Indian cement industry for handling uniform materials like limestone, coal, bauxite, and iron ore. These methods fall short when dealing with heterogeneous AFs due to the varying properties of these materials throughout the year, depending on their source, mix content, and other factors. Additionally, a lack of understanding of material flow and physical properties, such as shape, size, angle of repose and angle of inclination, contributes to chute issues.
Another key factor identified in the survey is the unexpected introduction of new materials that were not considered during chute design. Anticipating all potential AF types during design is challenging because cement plants select materials based on factors like cost, suitability for their raw mix, fossil fuel prices, and availability. Therefore, it was challenge to design a transfer chute which can handle various AF and their mix without any jamming issues.

Solution
Based on the survey result, NCB took the problem related to jamming of transfer chute while utilising AFs and their mix in Indian Cement Industry as an R&D project. The project commenced with the site visit of cement plants, discussion with plant personnel and determination of material properties, providing essential foundational data. Utilising this data, key input parameters were carefully selected to run the Discrete Element Modelling (DEM) simulations.
To ensure the DEM model’s accuracy, it underwent calibration through the development of CAD calibration models. These models aligned the DEM model with real-world conditions. Following calibration, the existing transfer chute design was simulated using DEM. Accordingly, 14 simulations of AFs were conducted using the DEM, and the subsequent outcomes were thoroughly examined to pinpoint significant concerns associated with the traditional chute design. This analysis served as the basis for developing an improved transfer
chute model. The enhanced design was subsequently subjected to DEM simulation to assess its
performance. The various designs were evaluated and necessary modifications were made to address any identified issues to improve the performance of the transfer chute.

Fig 1: Simulation Results for Industrial Waste
Additionally, adjustments to the DEM parameters were carried out to fine-tune the model’s accuracy. The ultimate goal of this comprehensive process was to arrive at the final design of a transfer chute suitable for handling AF and their mix without jamming. The final parameters obtained after fine tuning and making adjustment to the chute design in simulation are as follows:
• Chute Valley Angle: 70°
• Chute Width (Minimum): 4.3 to 4.5 times the lump size
• Chute Hood Height at the material entrance: Minimum 0.6 times the Belt Width
• Cross-sectional area of transfer chute: Minimum 10 to 11 times of cross-sectional area of the material stream inside the chute.
• Selected Liners: UHMWPE
Based on the above parameters obtained after simulation, an experimental setup comprising four transfer chutes and belt conveyors was established on NCB’s Ballabgarh premises to conduct experimental study on the different samples of AF collected from different cement plants and sites. Thereafter, 19 AF and their mix were collected from different cement plants across India. The materials were experimented on different mass flow rates of 3, 5, 8, 10 and 15 tph and with moisture content levels spanning from 0.18 to 45 per cent. Remarkably, even after a total of 261 hours of operation on the experimental setup, no instances of jamming were observed in the transfer chute.
Even when faced with a jamming scenario, the innovative flexible arrangement introduced in the transfer chute design (patent filed by NCB) proven to be highly effective at swiftly addressing blockages caused by solid AF. It helps in clearing these blockages in just six minutes, representing a significant improvement compared to the conventional method, which typically necessitates a lengthy 85 to 105 minutes to remove and resume operations. This innovative approach optimises the chute cleaning process, ensuring uninterrupted operations.
Figures 2, 3 and 4 shows the general arrangement of the of the experimental setup and glimpses of experiments:

Conclusion
In the cement industry, conventional transfer chute designs have posed challenges when handling a range of diverse alternative fuels. To address this issue, a new transfer chute design capable of handling various AFs and their mixtures has been developed by the NCB. This innovative design can handle various AFs and their mixes and also significantly reduces chute jamming and cleaning time to 6-8 minutes. The NCB led the development of this versatile transfer chute design, which promises to enhance material handling in cement plants. The project’s outcomes led by NCB are valuable for system design improvements and process optimisation, streamlining cement plant operations.

ABOUT THE AUTHOR:
Dr Kapil Kukreja, Group Manager (CME), NCB
has over 19 years of work experience in the field of System Design, Project Engineering and Management. He has previously worked with organisations like ACC, Holtec Consulting, JK White Cement etc.

Bharat Bhushan, Project Engineer (CME), NCB has a one-year experience as Project Engineer in the field of System Design, Project Engineering & Management.

Dr Dhirendra Kumar Panda, Joint Director, NCB has over 36 years of experience in the areas of Geology, Raw Materials and Mining and administrative experience as a Team Leader, Programme Leader and Head of the Centre.

Concrete

JSW Cement Begins Production At Nagaur Rajasthan Plant

Greenfield integrated cement plant begins operations in Rajasthan

Published

on

By

Shares



JSW Cement has started production at a new greenfield integrated cement plant in Nagaur, Rajasthan, marking its first integrated facility in north India. The commissioning advances its national expansion and raises cement grinding capacity to 24.1 million tonnes per annum (MTPA) and clinker manufacturing capacity to nine point seven four MTPA including joint venture capacity. The plant is strategically located to serve high growth markets in Rajasthan, Haryana, Punjab and the National Capital Region.

The Nagaur plant comprises a three point three MTPA clinkerisation unit and a two point five MTPA cement grinding unit, with an additional one MTPA grinding unit under construction. The facility’s capacity additions enable it to meet regional demand and support infrastructure development. The project was funded by equity and long term debt and the company allocated Rs 8 bn from IPO proceeds to part finance the unit.

Company leadership said commissioning was completed within 21 months and that the expansion advances its aim to become a pan India player, with a mid term target of 41.85 MTPA and a long term vision of 60 MTPA. The plant includes sustainability features such as co processing of alternative fuels and a seven kilometre overland belt conveyor to transport limestone from the mines, reducing road transport impacts. The operation is expected to support economic growth and provide supplies for construction projects across the north.

The site will incorporate a 16 megawatt (MW) Waste Heat Recovery System to capture and reuse process heat, reducing the carbon footprint. JSW Cement’s operations include eight plants in India and a clinker unit in the UAE through a joint venture, providing a presence across the building materials value chain. The company emphasised use of industrial by products in manufacture and focus on producing eco friendly building materials.

Continue Reading

Concrete

MAPEI India Celebrates 15 Years of Building Excellence

MAPEI India celebrates 15 years with growth, expansion and CSR impact

Published

on

By

Shares



MAPEI India marks its 15th anniversary, celebrating a journey defined by innovation, trust, and continuous growth. Beginning in 2011 with just four employees and a single manufacturing facility in Bengaluru, the company has evolved into a key player in India’s construction chemicals industry, now employing over 380 professionals across the country. Over the past 15 years, MAPEI India has delivered strong performance with a sales CAGR of 31 per cent. From zero production in its early years, the company shipped 1,71,000 metric tonnes of materials in 2025, demonstrating robust operational capabilities and rising market acceptance.
To support expanding demand, MAPEI India has steadily scaled its manufacturing footprint. Following the Bengaluru plant in 2011, new facilities were launched in Vadodara in 2016 and Kosi (Mathura) in 2022. A fourth facility in Kharagpur is set to go live in 2026, strengthening the company’s nationwide supply network.
As part of its commitment to global standards, MAPEI India operates under an Integrated Management System (IMS) certified for ISO 9001 (Quality), ISO 14001 (Environment) and ISO 45001 (Health & Safety). These certifications reinforce its dedication to delivering safe, sustainable, and high quality solutions.
With a diverse portfolio of over 20 product lines, MAPEI India has supported iconic projects such as the Atal Tunnel, the Statue of Unity, and major airport and metro developments. The company has also invested Rs 3.2 crore in CSR initiatives focused on education, women’s empowerment, and rehabilitation. As it steps into the future, MAPEI India remains committed to excellence, sustainability, and customer trust.
Mapei hai to bharosa hai.

Continue Reading

Concrete

Material Flow Efficiency

Published

on

By

Shares

We explore how material handling systems are becoming strategic assets in cement plants, enabling efficient movement of raw materials, clinker and finished cement. Advanced conveying, automation and digital technologies are improving plant productivity while supporting energy efficiency and sustainability goals.

Material handling systems form the operational backbone of cement plants, enabling the efficient movement of raw materials, clinker and finished cement across complex production networks. With India’s cement industry producing over 391 million tonnes of cement in FY2024 and possessing an installed capacity of around 668 mtpa, according to the CRISIL Research Industry Report, 2025, efficient material logistics have become critical to maintaining plant productivity and cost competitiveness. At the same time, cement production is highly energy intensive and contributes around 7 per cent to
8 per cent of global CO2 emissions, making efficient material flow and logistics optimisation essential for reducing operational inefficiencies and emissions states the International Energy Agency Cement Technology Roadmap, 2023. As plants scale capacity and integrate digital technologies, modern material handling systems, ranging from automated conveyors to intelligent stockyards, are increasingly recognised as strategic assets that influence plant stability, energy efficiency and environmental performance.

Strategic role of material handling
Material handling is no longer viewed as a secondary utility within cement plants; it is now recognised as a strategic system that directly influences production efficiency and process stability.
Cement manufacturing involves the continuous movement of large volumes of limestone, clay, additives, clinker and finished cement across multiple production stages. Even minor disruptions in conveying systems or storage infrastructure can lead to kiln feed fluctuations, production delays and significant financial losses. According to Indian Cement Industry Operational Benchmarking Study, 2024, unplanned downtime in large integrated cement plants can cost between Rs.15–20 lakh per hour, highlighting the economic importance of reliable material handling systems.
Modern cement plants are therefore investing in advanced mechanical handling systems designed for high throughput and operational reliability. Large integrated plants can process over 10,000 tonnes per day of clinker, requiring highly efficient conveying systems and automated stockyards to maintain continuous material flow, suggests the International Cement Review Industry Analysis, 2024. Efficient material handling also reduces spillage, minimises dust emissions and improves workplace safety. As cement plants become larger and more technologically advanced, the role of material handling is evolving from simple transport infrastructure to a critical operational system that supports both productivity and sustainability.

From quarry to plant
The transport of raw materials from quarry to processing plant represents one of the most energy-intensive stages of cement production. Traditionally, limestone and other raw materials were transported using diesel-powered trucks, which resulted in high fuel consumption, dust generation and increased operational costs. However, modern plants are increasingly adopting long-distance belt conveyors and pipe conveyors as a more efficient alternative. These systems allow continuous material transport over distances of 10–15 kilometres, significantly reducing fuel consumption and operating costs while improving environmental performance, states the FLSmidth Cement Industry Technology Report, 2024.
Milind Khangan, Marketing Manager, Vertex Market Research & Consulting, says, “Efficient and enclosed handling of fine materials such as cement, fly ash and slag requires modern pneumatic conveying systems. By optimising the air-to-material ratio, these systems can reduce energy consumption by 10 per cent to 15 per cent while ensuring smooth material flow. Closed-loop conveying further minimises dust loading and improves the performance of bag filters, supporting cleaner plant operations. In addition, flow-regulated conveying lines help prevent clogging and maintain reliable dispatch performance. Overall, automation in pneumatic conveying delivers immediate operational benefits, including improved equipment uptime, lower energy use, reduced material spillage and more stable kiln and mill performance.”
Pipe conveyor systems are particularly gaining traction because they provide a completely enclosed transport system that prevents material spillage and dust emissions. According to global cement engineering studies, conveyor-based transport can reduce energy consumption by up to 30 per cent compared to truck haulage, while also improving operational reliability. Several cement plants in India have already implemented such systems to stabilise quarry-to-plant logistics while reducing carbon emissions associated with diesel transport.

Stockyard management and homogenisation
Stockyards play a critical role in maintaining raw material consistency and stabilising kiln feed quality. Modern cement plants use advanced stacker and reclaimer systems to ensure efficient storage and blending of raw materials before they enter the grinding and pyroprocessing stages. Automated stacking methods such as chevron or windrow stacking enable uniform distribution of materials, while bridge-type or portal reclaimers ensure consistent extraction during kiln feed preparation. These systems are essential for maintaining stable chemical composition of raw meal, which directly influences kiln efficiency and clinker quality. The Cement Plant Operations Handbook, 2024 indicates that advanced homogenisation systems can reduce raw mix variability by up to 50 per cent, significantly improving kiln stability and energy efficiency. Integrated stockyard management systems also incorporate sensors for monitoring bulk density, moisture levels and stockpile volumes, enabling real-time control over material blending processes.

Clinker and cement conveying technologies
Once clinker is produced in the kiln, it must be efficiently transported to storage silos and subsequently to grinding and packing units. Modern cement plants rely on high-capacity belt conveyors, bucket elevators and pneumatic conveying systems to manage this stage of material flow. Steel-cord belt bucket elevators are now capable of lifting materials to heights exceeding 120 metres with capacities reaching 1,500 tonnes per hour, making them suitable for large-scale clinker production lines, states the European Cement Engineering Association Technical Paper, 2023.
For fine materials such as cement, fly ash and slag, pneumatic conveying systems provide a reliable and dust-free solution. These systems transport powdered materials using controlled airflow, ensuring enclosed and contamination-free movement between grinding units, silos and packing stations. Optimised pneumatic systems can reduce energy consumption by 10 per cent to 15 per cent compared to older conveying technologies, while also improving plant cleanliness and environmental compliance, according to the Global Cement Technology Review, 2024.

Automation and digitalisation
Digitalisation is transforming material handling systems by introducing real-time monitoring, predictive maintenance and automated control. Advanced sensors and Industrial Internet of Things (IIoT) platforms enable plant operators to track conveyor health, stockpile levels and equipment performance in real time. Predictive maintenance systems analyse vibration patterns, temperature fluctuations and equipment load data to detect potential failures before they occur. According to McKinsey’s Industry 4.0 Manufacturing Report, 2023, for heavy industries, digital monitoring and predictive maintenance technologies can reduce equipment downtime by up to 30 per cent and increase productivity by 10 per cent to 15 per cent. Digital control centres also integrate data from conveyors, stacker reclaimers and dispatch systems, enabling centralised management of material flows from quarry to dispatch.

Handling of AFR
The growing adoption of Alternative Fuels and Raw Materials (AFR) has introduced new challenges and opportunities for material handling systems in cement plants. AFR materials such as refuse-derived fuel (RDF), biomass and industrial waste often have irregular particle sizes, variable moisture content and lower bulk density compared to conventional fuels. As a result, specialised storage, dosing and feeding systems are required to ensure consistent kiln combustion. According to the Cement Sector Decarbonisation Roadmap published by NITI Aayog in 2026, increasing the use of AFR could enable India’s cement sector to achieve thermal substitution rates of around 20 per cent in the coming decades. To support this transition, plants are investing in automated receiving stations, shredding units, drying systems and precision dosing equipment to stabilise AFR supply and combustion performance.

Energy efficiency and dust control
Material handling systems also play a crucial role in improving plant energy efficiency and environmental performance. Modern conveyor systems equipped with variable speed drives and energy-efficient motors can significantly reduce electricity consumption. Permanent magnet motors used in conveyor drives can deliver 8 per cent to 12 per cent energy savings compared to conventional induction motors, improving overall plant energy efficiency according to the IEA Industrial Energy Efficiency Study, 2023. Dust control is another major concern in cement plants, particularly during material transfer and storage operations. Enclosed conveyors, dust extraction systems and advanced bag filters are widely used to minimise particulate emissions and improve workplace safety.

Future trends in material handling
The future of material handling in cement plants will be shaped by automation, digitalisation and sustainability considerations. Emerging technologies such as AI-driven logistics optimisation, autonomous mobile equipment and digital twins are expected to further improve plant efficiency and operational visibility. Digital twin models allow engineers to simulate material flow patterns, optimise stockyard operations and predict equipment performance under different operating conditions. According to the International Energy Agency Digitalisation and Energy Report, 2024, the adoption of advanced digital technologies could improve industrial energy efficiency by up to 20 per cent in heavy industries such as cement manufacturing. As cement plants expand capacity and adopt low-carbon technologies, intelligent material handling systems will play a critical role in maintaining productivity and reducing environmental impact.

Conclusion
Material handling systems have evolved from basic transport infrastructure into strategic operational systems that directly influence plant efficiency, reliability and sustainability. From quarry transport and automated stockyards to digital dispatch platforms and advanced conveying technologies, modern material handling solutions enable cement plants to manage large production volumes while maintaining process stability.
As India’s cement industry continues to expand to meet infrastructure and urban development demands, investments in advanced material handling technologies will become increasingly important. By integrating automation, digital monitoring and energy-efficient systems, cement manufacturers can improve operational performance while supporting the industry’s long-term sustainability and decarbonisation goals.

  • Kanika Mathur

Continue Reading

Trending News

SUBSCRIBE TO THE NEWSLETTER

 

Don't miss out on valuable insights and opportunities to connect with like minded professionals.

 


    This will close in 0 seconds