Concrete

Waste Heat Utilisation is now a proven technology

Published

4 years ago

April 1, 2022

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Sanjay Kumar Khandelwal, Head – Power Plants, JK Cement, shares details about the working of waste heat recovery systems (WHRS) and its benefits, while elaborating on the efforts undertaken by his company to become energy-efficient.

What are the alternative or renewable sources of energy used by your organisation for the process of cement manufacturing?
At JK Cement, we are at the forefront of our sustainability journey. To achieve our clean energy targets, the alternative renewable energy sources used by our organisation are solar plants, wind energy, hydel energy, biomass and waste heat recovery systems (WHRS). The use of alternative fuels and raw material (AFR) to substitute fossil fuels has also been initiated.
We have installed WHRS with all the kilns except one kiln which we are planning to install in FY 22-23. In FY21 our Green Power Mix was 25 per cent and we are working to increase it to 75 per cent by FY 2030.
We started our AFR journey in FY 2013-14 with a very small quantity and now we have achieved a TSR of 6.5 per cent in FY 2020-21. We are proud to share that we have achieved a TSR of 20 per cent at one of our plants. To achieve the TSR target of 35 per cent we have made huge investments for installation of shredder, covered storage shed and feeding arrangement for both solid and liquid waste, refuse derived fuel (RDF), plastic waste etc. Further, to overcome the operational challenges we are installing chlorine bypass, an outside burning system and more shredders are also in the pipeline. For the supply side, we have recently signed a MoU with PRESPL for the supply of biofuel and biomass to achieve the proposed TSR target of 35 per cent

When did your organisation install the WHRS in cement plants and what were the key considerations taken into account while doing the same?
The first WHRS with a capacity of 13.2 MW was commissioned in 2008 at JK Cement Works, Nimbahera. Recently in our plant at Mangrol, we upgraded the capacity to 29.1 MW from 10 MW after the installation of Kiln-3. Our objective was to generate power without any additional fuels, maximise utilisation of waste heat generated from kiln operations, minimise heat losses into the environment and finally minimise water consumption.

What was the energy consumption of the plant prior to the system and how has that changed post installation?
Installation of WHRS plays a major role in not only reducing the overall energy consumption cost but also the requirement of other available non-renewable energy resources. This has resulted in minimising the Grid and CPP as a result of implementing WHRS to meet our energy requirements. Apart from that, regular monitoring of WHRS parameters and process optimisation is being done on a regular basis to recuperate maximum heat from the system so as to generate maximum power and to keep the WHRS system efficient.

How does the process of waste heat recovery work? What is the technology used by your organisation for its functionality and monitoring?
WHRS works on the thermal Rankine Cycle concept. Steam (hot gases) emitted from the preheater exit as well as clinker cooler from the Kiln operations, enters into the WHRS system. The steam then passes through the turbine to further the power generation process.
In order to ensure that our power generation is as efficient as possible, we have adopted the best operating and maintenance practices. This includes operating from a central control room using a state-of-the-art PLC-based operating system while keeping manual intervention to a minimum. We also compare the actual results with the design and the best data on a daily basis, making any adjustments necessary in real-time besides conducting regular system audits to ensure the efficiency of our WHRS.

On an average, energy cost is around 40 per cent of the production cost for cement manufacturing. What is the impact of the waste heat recovery system on the energy cost of the cement plant?
WHRS utilises hot gases emitted both from preheater as well as clinker cooler to generate power without the usage of any additional fuel. In other words, we are able to generate power without utilising any fossil fuels; which not only reduces overall carbon footprints but also restricts hot gases from entering into the atmosphere. This system results in reducing the overall cost of production by reducing overall power consumption cost followed by a reduction in cost through optimum power mix (maximum usage of WHRS and renewable power sources and least usage of grid and CPP power) through effective power management.

The WHRS is a major contributor towards reducing the carbon footprint. Tell us about its impact and support in achieving the decarbonising goals of the cement industry.
WHRS utilises hot gases emitted both from preheater as well as clinker cooler to generate power without the usage of any additional fuel. In other words, we are able to generate power without utilising any fossil fuels; which not only reduces the overall carbon footprint but also restricts hot gases from entering into the atmosphere.
This system results in reducing the overall cost of production by reducing our power consumption cost followed by a reduction in cost through optimum power mix and through effective power management.

What other technological or automation advancements can contribute towards making the process of cement manufacturing energy optimised?
To name a few: VFD installation, PID-based automation, low DP control valve installation, high energy efficient fans, high efficient motors, PF improvement system, cross country belt conveyors for material conveying, installation of horizontal roller press (HRP) mills with lower specific energy consumption, high efficiency cooler, lower pressure drop preheater, high efficiency latest motors, mechanical conveying in place of pneumatic conveying, replacement of reciprocating compressors with screw compressors, automation of compressed air pressure as per requirement with installation of controller, adopting drip irrigations to conserve water, regular audits etc, can all go a long way in improving and optimising cement manufacturing process.

Are there any specific researches taken in the direction of finding more alternative sources of energy that have a lower impact on the environment?
At a global level, to extract heat at a low temperature range, Organic Rankine Cycle based power generation, Vapour Absorption Machine, water heating and the use of CPP are some of the latest developments, which contribute a lot in reducing the carbon footprint. However, this requires very high capital investments.
The use of green hydrogen as an alternative fuel, electrification of clinkering process, use of concentrated solar energy for producing clinker are the fields that can be explored that has the potential to lower environmental impact

How do you foresee the future of energy consumption in the cement manufacturing process and its impact on the end product cost?
World energy demand is expected to increase by 35 per cent by 2030 as developing nations have to modernise and expand their economic output. This creates a near impossible scenario for secure, low carbon energy supplies to keep pace with this demand. So, the need of the hour is to be 3 times more energy efficient!
In today’s scenario, the cement industry is becoming more and more energy efficient not only through its process optimisation but also by adopting newer technologies. Waste Heat Utilisation is now a proven technology and has become an integral part of the cement manufacturing process. AFR is another viable option that has the potential to reduce the consumption of fossil fuels. This can not only help in reducing carbon footprint but also improve cost economics besides reducing environmental impact. Other industry wastes like slag, red-mud, zinc waste etc. and hazardous wastes along with biomass are also being used.
Chemical gypsum and similar alternative raw materials are also being used in the cement process. This has not only made the manufacturing process energy efficient but has also optimised the end product cost. However, other factors like increasing fuel and raw materials cost, manpower, overheads, logistics and mining cost etc. are major concerns that can increase the end-product cost, therefore, nullifying the effect of optimisation and energy efficiency.
With a strong focus on AFR usage, the challenge that we face is in terms of its availability, utilisation, economic and technical feasibility. This also requires creating an ecosystem that supports its adoption. Therefore, regulatory authorities need to come forward and help take this to the level that has been achieved by developed countries.

-Kanika Mathur

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Cement Makers Reaffirm Commitment to Sustainable Growth

Published

7 hours ago

June 5, 2026

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World Environment Day spotlight on innovation and circularity

On World Environment Day, the Indian cement industry reiterated its commitment to supporting India’s climate ambitions through sustainable manufacturing, resource efficiency and the adoption of cleaner technologies.

The Cement Manufacturers’ Association (CMA) said the sector remains aligned with the Government of India’s Net Zero commitments and is accelerating efforts to reduce its environmental footprint while supporting the country’s infrastructure and development agenda.

Parth Jindal, President, CMA and Managing Director, JSW Cement, said the industry is increasingly adopting cleaner technologies, improving energy efficiency and expanding the use of alternative fuels and raw materials. He also highlighted the growing importance of circular economy practices, where industrial by-products and waste streams from one sector are utilised as resources in another.

“The Indian Cement Industry is aligned to the Government’s commitments on carbon mitigation and is accelerating the adoption of cleaner technologies, resource efficiency and circular economy practices while actively exploring the potential of Carbon Capture, Utilisation and Storage (CCUS) as a critical pathway for deep decarbonisation,” said Jindal.

He added that coprocessing industrial waste and by-products helps conserve natural resources, reduce disposal requirements and lower the environmental footprint across multiple sectors.

According to Jindal, sustainability is no longer limited to manufacturing processes but is increasingly influencing investment decisions, innovation strategies and long-term growth plans within the industry.

Echoing similar views, Dr Raghavpat Singhania, Vice President, CMA and Managing Director, JK Cement, said sustainable development extends beyond emissions reduction and must also focus on responsible resource utilisation and waste minimisation.

“Sustainability in the built environment cannot be measured by emissions alone. It is equally about how efficiently we use resources, how effectively we minimise waste and how responsibly we create the infrastructure that will serve future generations,” said Singhania.

He noted that the cement industry is advancing its sustainability agenda through greater resource efficiency, increased circularity, technological innovation and continuous improvements in manufacturing practices. As a key contributor to India’s infrastructure development, the sector has a critical role to play in balancing economic growth with environmental responsibility.

On the occasion of World Environment Day, industry leaders reaffirmed their commitment to supporting India’s climate goals while delivering the materials required for resilient, durable and sustainable infrastructure.

Concrete

Building a Greener Future Together

Published

1 day ago

June 4, 2026

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Environmental sustainability requires immediate action, not just long-term commitments and discussions. Recycling, circular economy practices, and technology-driven waste management can help industries reduce environmental impact while supporting sustainable growth.

Author: Jignesh Kundaria, Director and CEO, Fornnax Technology

World Environment Day serves as an important reminder that environmental sustainability can no longer remain confined to discussions, reports, or long-term commitments. The environmental challenges facing the world today demand immediate, measurable, and collective action. Across industries and communities, waste generation continues to outpace our ability to process it responsibly, placing increasing pressure on ecosystems, natural resources, public health, and the well-being of future generations.

One of the most significant shifts required today is a change in how society perceives waste. Rather than being viewed as a material to be discarded, waste must be recognised as a valuable resource that can contribute to both economic growth and environmental protection when managed through the right technologies and systems. This mindset forms the foundation of the circular economy model that countries across the world are increasingly adopting to reduce landfill dependence, recover valuable materials, and create more sustainable industrial ecosystems.

India has made meaningful progress in strengthening awareness around sustainability, recycling, and environmental responsibility over the past decade. Significant efforts are being made to formalise the recycling sector through improved infrastructure, technology adoption, policy implementation, and broader stakeholder participation. These developments are creating a stronger foundation for responsible waste management and resource recovery across the country.

However, achieving long-term environmental impact requires collaboration from all stakeholders. Industries, policymakers, technology providers, and communities must work together with greater accountability to strengthen recycling ecosystems, encourage responsible waste management practices, and create sustainable outcomes through consistent execution rather than temporary interventions.

As someone closely associated with the recycling industry, I firmly believe that technology will play a decisive role in addressing future environmental challenges. Advanced recycling systems have the potential to recover valuable resources, reduce pollution, minimise landfill burdens, and conserve energy, creating a more sustainable future for generations to come. This belief is deeply reflected in Fornnax’s motto, “Committed to Create a Green Future,” which embodies our commitment to building long-term environmental value through innovation and responsible action.

At the same time, technology alone cannot deliver meaningful change. Real progress requires intent, awareness, participation, and a shared sense of responsibility. Sustainable development can only be achieved when innovation is supported by collective action and a genuine commitment to environmental stewardship.

On this World Environment Day, let us move beyond conversations and take meaningful steps towards creating a cleaner, greener, and more sustainable planet. By embracing innovation, strengthening recycling ecosystems, and acting responsibly today, we can create lasting environmental impact and secure a better future for generations to come.

Concrete

JK Lakshmi Advances LC3 Cement Expansion

Company highlights commercial production and research partnerships

Published

4 days ago

June 1, 2026

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The meeting reviewed progress in limestone calcined clay cement (LC3) technology and its commercial adoption in India’s cement sector, focusing on low-carbon alternatives to conventional binders. JK Lakshmi Cement noted that limestone calcined clay cement can reduce carbon dioxide emissions by up to 40 per cent compared with conventional cement and said this reduction supports industry decarbonisation. The company highlighted that it was among the first two cement manufacturers in India to move LC3 into commercial production after the Bureau of Indian Standards approved the technology as a cement standard.

Vinita Singhania said the transition of LC3 from research to commercial production reflected collaboration between industry, academia and international institutions. Maya Tissafi acknowledged JK Lakshmi Cement’s role in advancing LC3 adoption in India and its contribution in taking the technology from laboratory trials to commercial implementation. Both representatives underlined the growing relevance of sustainable construction materials as India expands infrastructure and urban development.

The meeting explored continued collaboration with Swiss research institutions such as EPFL, EMPA and ETH Zurich alongside Indian academic partners and development organisations. JK Lakshmi Cement has been associated with the LC3 initiative since 2014 and worked with EPFL, IIT Delhi, IIT Madras, Development Alternatives and Technology and Action for Rural Advancement. The company conducted one of the earliest industrial trials of LC3 and recently announced commercial production of Green Pro LC3 cement from its Jaykaypuram plant in Rajasthan.

India remains the world’s second-largest cement producer and expansion of infrastructure, urbanisation and housing demand continue to support long-term sector growth, increasing interest in low-carbon technologies. The company reported an annual turnover of more than Rupees (Rs) 60 bn and current cement capacity of about 18 million (mn) tonnes (t) per annum, with a target of reaching 30 million (mn) tonnes (t) by 2030. Apart from grey cement, the company also makes ready-mix concrete, gypsum plaster, wall putty, primers, adhesives and fly ash blocks, and both sides concluded on the need for continued collaboration to develop sustainable construction solutions.