Concrete

Being Proactive about Sustainability

Hard-hitting facts such as scarcity and price hike of fossil fuels and challenges of waste management warn of difficult times ahead for the Indian cement industry, unless the players increase their efforts at increasing the capacity of Waste Heat Recovery Systems to meet their energy requirements.

Published

4 years ago

April 14, 2022

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Waste heat recovery has long been the base standard for setting up cement manufacturing units. In China, a cement kiln will not get an official sign-off unless it has waste heat recovery systems. In Europe, any industry requiring large quantities of heat input for manufacturing must have waste heat recovery as a natural corollary, and sometimes its use could be extended to providing heat input to the neighbourhood and community for simple needs such as room and water heating systems.

The economics of Waste Heat Recovery Systems (WHRS) is preceded by sustainability concerns, as cement manufacturing in kilns continues to produce 8 per cent of the global greenhouse gas (GHG) emissions. The conversion of limestone to clinker is where the bulk of the heat energy is expended. However, this bulk of heat energy that is generated in six-stage preheater kilns by burning of any fossil fuel input actually gets wasted as shown in the pie-chart Fig 1, and only 58 per cent is used in the conversion process yielding clinker.

Theoretically 710 Kcal needs to be generated to convert 1 kg of clinker, out of which actual conversion process would need 410 Kcal, the rest ending up as losses, which can be recovered. In reality, the Indian cement industry average is 744 Kcal of heat input for producing 1 kg of clinker, which means the actual losses are even more than the theoretical possibility.

Out of the total generated heat there are some unavoidable losses, that include radiation loss, loss for evaporation of residual moisture in fine coal and raw meal and some part of heat going with clinker from cooler. The balance loss in pre-heater exhaust gases and the cooler exhaust gases are completely recoverable through WHRS.

Let us look at some statistics from the Indian cement industry. On an average, Indian cement plants require electrical power of 20 billion kWh per year. The coal needed for generating this much power accounts to 32 million tonnes per year. A significant portion of this power could be replaced by the WHRS that will use waste heat from the kilns to generate electricity.

In sustainability terms, this is equivalent to replacing a large component of the 32 million tonnes of coal to be otherwise burnt for producing electricity. WHRS are also very stable systems that operate on the Rankine cycle and it provides an avenue for utilising waste water from the process as well.

Balancing the investments

Let us now see the economics of putting up a captive power generating unit versus putting up a WHRS. The capital investment for WHRS is high at Rs 8 cr per MW going by the current costs, whereas the CPP units can come at Rs 4.5 cr per MW. However, the project Internal Rate of Return (IRR) would be very different as the cost of generation would be as low as Rs 0.40 per unit for the former while Rs 4.5 per unit for the latter, which given the current trajectory of fossil fuel prices is already under severe stress of upward correction. It is only the initial cost that continues to act as a deterrent for putting up a waste heat recovery unit.

The Indian cement industry must act responsibly and move quickly to put in investments that could raise the waste heat recovery installed capacity to cross the minimum threshold of 25 per cent of electricity consumption. That will still be far from the 20 billion KWhr of total electricity consumption by the industry.
The other area of concern is the price trajectory of fossil fuels, which would continue to move northwards. WHRS is one of the simpler ways of insulating the industry from the vagaries of future price increases.

Thus WHRS could be the natural hedge to fossil fuel price increases for a substantial portion of the electrical consumption. As matters stand today most WHRS would be the highest IRR projects that the industry as an ensemble can think of.

-Procyon Mukherjee

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Concrete

World Cement Association Annual Conference 2026 in Bangkok

Global leaders to focus on decarbonisation and digitisation

Published

1 day ago

March 2, 2026

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The World Cement Association (WCA) will host its 2026 Annual Conference from 19–21 April 2026 at The Athenee Hotel in Bangkok, Thailand. The two-day programme will convene global cement industry leaders, policymakers, technology providers and stakeholders to examine strategic, operational and sustainability challenges shaping the sector’s next phase of transformation. The conference theme of shaping a sustainable future through digitisation, innovation and performance will frame sessions and networking opportunities across the event.\n\nThe programme will open with a comprehensive assessment of the global economic environment and its impact on cement markets, alongside regional outlooks across Asia and Europe. Speakers will address regulatory developments including carbon border adjustment mechanisms (CBAM) in Europe, progress in China’s carbon trading system and market dynamics in Thailand and South East Asia, and will outline practical decarbonisation pathways such as alternative fuels, next-generation supplementary cementitious materials (SCMs) and calcined clay developments. Sessions will also examine AI-enabled kiln optimisation and other digital approaches to improve plant performance.\n\nDay two will focus on overcapacity challenges and industry restructuring, using case studies and regional perspectives to provide delegates with practical insights into unlocking performance while accelerating decarbonisation. Discussions will explore digital maturity and AI-driven plant operations, manufacturing optimisation, sustainable building solutions and circular concrete models, together with evolving customer requirements across the construction value chain. The event will include the WCA Awards Ceremony at the Awards Gala Dinner on 20 April to recognise excellence in sustainability, innovation, safety and leadership.\n\nPhilippe Richart, chief executive officer of the WCA, said the sector was navigating a period of profound transformation, from managing overcapacity and market volatility to deploying AI and delivering measurable decarbonisation, and that the Annual Conference would bring global leaders together to exchange practical solutions and strengthen collaboration. Registration is open and tickets include admission to the two-day event, all sessions, refreshments and lunch, exhibition access and the Awards Gala Dinner. Further information on the programme is available via the WCA Annual Conference 2026 event page and queries on sponsorship or exhibition may be directed to events@worldcementassociation.org.

Concrete

Assam Chief Minister Opens Star Cement Plant In Cachar

New plant aims to boost local industry and supply chains

Published

1 day ago

March 2, 2026

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Chief Minister Himanta Biswa Sarma inaugurated the Star Cement plant in Cachar on 28 February 2026, marking the opening of a manufacturing facility designed to serve the region. The event was attended by state officials and company representatives, and it was reported with inputs from ANI. The plant is positioned as a strategic addition to the industrial landscape of southern Assam and is expected to improve the availability of construction materials for local projects.

The establishment is expected to generate employment opportunities and to stimulate ancillary businesses in the supply chain, including transport and local vendors. State officials indicated that the plant will enhance logistical efficiency by reducing the need to transport cement over long distances, which may lower construction costs for public and private projects. Observers said the presence of a regional cement facility can support housing and infrastructure initiatives that are underway or planned.

Government representatives reiterated that the state seeks to attract responsible investment that complements regional priorities and that the administration will continue to facilitate infrastructure and connectivity to support industrial operations. The inauguration was presented as consistent with broader efforts to diversify the industrial base in the northeast and to create an enabling environment for small and medium enterprises that supply goods and services to larger manufacturers.

Company sources and the state leadership underlined the importance of maintaining environmental safeguards while pursuing industrial growth, and they signalled that compliance with applicable norms will be a priority at the new facility. The announcement was framed as a step towards balanced development that links job creation, regional supply chains and local economic resilience. The report was prepared by the TNM Bureau with inputs from ANI.

Concrete

Adani Cement, NAREDCO Form Strategic Alliance

Partnership to advance skills and sustainable construction

Published

1 day ago

March 2, 2026

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Adani Cement has entered into a strategic partnership with the National Real Estate Development Council (NAREDCO) to support India’s expanding housing and infrastructure requirements aligned with the vision of Viksit Bharat 2047.

The collaboration brings together Adani Cement’s building materials portfolio, research capabilities and technical expertise with NAREDCO’s network of over 15,000 member organisations. The partnership will focus on skill development, knowledge exchange, technology adoption and sustainable construction practices across the real estate ecosystem.

Joint initiatives will include certification programmes for masons and contractors, along with training modules for site supervisors from NAREDCO member organisations to strengthen execution standards and quality control. The partners will also promote modern construction technologies, green materials and integrated building solutions, including ready-mix concrete, while exploring support for affordable housing.

Vinod Bahety, CEO – Cement Business, Adani Group, said, “This partnership reflects a shared commitment to nation-building and to creating an ecosystem where quality, innovation, and sustainability are integral to every project. By working closely with NAREDCO, we aim to equip developers with advanced materials, deeper technical support, and structured knowledge platforms that can improve performance across the entire project lifecycle.”

Dr. Niranjan Hiranandani, Chairman, NAREDCO, stated that the association aims to encourage responsible construction practices and promote adoption of green building norms across expanding urban centres.