Concrete
Role of Gasification
Published
2 years agoon
By
admin
Dr Prateek Sharma, KPK Reddy, Moon Chourasia and Dr DK Panda, National Council for Cement and Building Materials (NCCBM), Ballabgarh, India, present their ideas on the integration of high ash refuse derived fuel and the role of gasification in the cement manufacturing process.
Refuse derived fuel (RDF) has been identified as one of the major fuels for the Indian cement industry to achieve TSR of around 30 per cent by 2030. However, challenges persist in maximising RDF utilisation in cement production like incomplete combustion, increased specific heat consumption, and inconsistent RDF quality due to varying sources and moisture content which can be overcome by RDF gasification. Gasification of RDF produces syngas that can be used as fuel, offering advantages in terms of combustion efficiency and clinker quality, particularly valuable for white cement manufacturing. Moreover, the ash produced in the gasification process can be repurposed as an alternative raw material. Experimental runs in a downward draft gasifier demonstrated the feasibility of RDF gasification and RDF-biomass co-gasification. A multi-zone gasifier model was also developed to simulate RDF gasification, taking into account the heterogeneous nature of RDF. The model successfully predicted the properties of the producer gas in each zone, providing a valuable tool for optimising gasification processes.
Nature of solid waste changes as societies get richer and more urbanised. Instead of biodegradable waste (wet), households generate more and more quantities of plastics, metals, and other non-biodegradable (dry) waste. 65 million tonnes of waste are generated annually in India of which over 62 million tonne is the share of Municipal Solid Waste (MSW). Only about 75-80 per cent of the municipal waste gets collected and out of this only 22- 28 per cent is processed and treated. The remaining MSW is deposited at dump yards. With population explosion and urbanisation, this trajectory is expected to reach 165 million tonnes by 2031, and up to 436 million tonnes by 2045. With this precipitous rise in the quantity of waste generated, the waste collection efficiency in India still has a lot to catch up.
RDF is a form of MSW that has been sorted and subject to basic processing treatment. MSW is treated by shredding and dehydrating to produce Refuse Derived fuel (RDF). It largely comprises combustible components of municipal waste which has more consistent combustion characteristics than unsorted MSW. RDF roughly comprises 15-20 per cent of MSW. As per the current scenario, the availability of RDF, considering the proximity of cement plants in India, is estimated to be around 13600 tonnes of RDF per day, equivalent to 4.96 million tonnes per annum. The Indian cement industry has improved to around 7 per cent thermal substitution rate (TSR) and is targeting to achieve 30 per cent TSR by 2030. Currently, all high TSR plants (14-30 per cent) are using RDF and plastics as major fuel with 69 per cent share in quantity. Currently, biomining is also being practised all over the country’s landfills to produce fractions comprising RDF, biodegradable matter, compost, and inert component. RDF produced is being sent to cement plants. However, there are operational challenges.
CHALLENGES WITH RDF USAGE
The maximum thermal substitution rate (TSR) achieved through RDF is 80-100 per cent in the calciner, while it is limited to 50-60 per cent in the kiln burner. Different AF pre-combustion technologies, advancements in multi-channel burners, and new satellite burners have supported high TSR worldwide. Extensive efforts in modelling kiln burners and calciners lead to enhanced TSR. However, the cement industry still faces fundamental operational issues such as high CO and incomplete combustion, increased specific heat consumption, reduced flame temperature, jamming and buildups. The nature of RDF including moisture content varies enormously with changes in sources. Improper segregation, low calorific value, high chloride content, cost fluctuations and poor characterisation facilities leads to an inconsistent quality altogether affecting the production and quality. Higher RDF utilisation sometimes requires a kiln bypass system which along with pre-processing also adds up as an additional cost.
RDF GASIFICATION AS A GAME CHANGER
RDF gasification can pose a promising solution to eliminate operational issues. Gasification is the thermal conversion of carbonaceous matter into a syngas by partial oxidation. Here the trash is heated in a low-oxygen environment to the point that it breaks down into its constituent molecules. This reaction has two products: a combustible gas called syngas and inert ash or char. Syngas can be directly burned in the calciner/kiln with minimal prior cleaning. Syngas has better combustion properties in the calciner than even small size solid waste directly fed to the calciner. Moisture will participate in gasification reactions to a certain extent and increase the NCV of syngas by contributing to H2 production through water gas shift reaction. NCV variations of the input fuel mix (coal and syngas) are reduced substantially due to consistent syngas composition. Moreover, it offers better clinker quality due to no additional ash in the clinker. No ash absorption by clinker can also facilitate the usage of marginal and low-grade limestone. Thus, a hard-to-burn fuel can be made easily combustible. Gasification integration with the cement industry will help achieve the target of 25 per cent TSR within the timeframe. The GOI has set a target of 100 million tonnes of coal gasification by the year 2030. This will also facilitate co-gasification of coal and waste, having the advantage of improved syngas quality.
GASIFIER INTEGRATION CONFIGURATIONS
There can be different configurations for integrating the gasifier with the pyroprocessing system reported in literature. Fuel gasification taking place in a gasifier in the presence of kiln exhaust gas at high temperature along with a portion of tertiary air from the cooler can be one option. Syngas gets burnt in the calciner in the presence of balanced tertiary air to provide heat for raw meal calcination. Tertiary air is split between calciner and gasifier. Another configuration involves a unique concept of separate hydrogen production taking advantage of the cement manufacturing process. Ash from the gasifier can be sent to the smoke chamber where some unburnt carbon present in ash will get burnt, and the heating value can be utilised for combustion purpose. Another way of ash utilisation is an alternative raw material. The syngas can also prove to be very helpful in white cement manufacturing. As per IS 8042, the iron content in white cement should be less than 1 per cent and the degree of whiteness should be greater than 70 per cent. As syngas has no residual ash, the whiteness index and iron content can be easily maintained. One configuration involves a separate gasifier set up and syngas produced being sent to the calciner replacing conventional fuel.
MODELLING and EXPERIMENTAL RUNS
National Council for Cement and Building Materials (NCCBM) in collaboration with the Birla Institute of Technology (BITS) Pilani-Pilani campus carried out experimental runs in a downward draft gasifier for RDF gasification and RDF-biomass mix co-gasification. RDF contains ash in the range of 30-50 per cent. A multizone gasifier model was developed for RDF gasification having four zones, i.e., drying, pyrolysis, oxidation/combustion and reduction/gasification. In each zone, different thermochemical phenomena occur. A stoichiometric approach is followed for modelling the drying, pyrolysis and combustion zone. The reduction zone is modelled as a cylindrical fixed bed reactor with a uniform cross-sectional area. The developed differential equations are solved using simulation software to predict the producer gas properties. Further, to study the integration of gasifier with calciner, a stoichiometric based model has been developed for calciner along with material and energy balance which predicted calciner outlet temperatures, gas composition, SO2 and CO2 for co-processing of producer gas as an alternative fuel in white cement plant replacing petcoke at 15 per cent TSR.
RESULTS
Gasification experiments were performed with RDF fluff and RDF pelléts as feedstock and air as gasifying agents. The gas yield ranges from 2.43-3.65 Nm/kg RDF with LHV of 1.87-2.24 MJ/Nm3 RDF and cold gas efficiency of 44-60 per cent. It is observed that RDF containing high ash content in the range of ~31-51 per cent is quite challenging to gasify in a downdraft-type gasifier with operational bridging and clinker formation issues. Upon adding O2 to air as a gasifying agent, LHV and CGE increased by 78 per cent and 30 per cent, respectively further, more experimental runs were carried out using RDF and biomass mix in different ratios using air as a gasifying agent. RDF-biomass mix co-gasification results are better than RDF gasification in terms of LHV and CGE. Upon adding O2 to air as a gasifying agent for a 50:50 RDF-biomass mix, LHV and CGE uncreased by 35.5 per cent and 8.35 per cent, respectively.
The proposed multizone gasifier model can predict the output of each zone satisfactorily since the model assumptions are more realistic and cater to the heterogeneous nature of RDF. The impact of equivalence ratio (ER), moisture content and reduction zone length on the performance of the gasifier are evaluated. For calciner modelling at 15 per cent
TSR, the model predicted the calciner outlet temperature accurately compared to the baseline scenario (100 per cent petcoke firing). Considering the biogenic content in RDF, CO2 mitigation potential due to RDF utilisation as producer gas is estimated to be 10.5 per cent of the baseline scenario at 15 per cent TSR.
CONCLUSION
RDF gasification stands out as a transformative approach to address operational challenges encountered in maximising RDF utilisation. By converting RDF into a syngas, this method provides several advantages apart from overcoming the current operational challenges during co-processing of RDF in cement production. The experimental runs and modelling efforts conducted in this research explore the viability of RDF gasification as a game-changing solution. This aligns well with India’s broader environmental, energy and waste utilisation objectives, positioning RDF gasification as a sustainable and efficient means of addressing the growing issue of solid waste while contributing to the country’s sustainability goals.
ABOUT THE AUTHORS

Dr Prateek Sharma is an energy auditor, manager at Centre for Mining, Environment, Plant Engineering, and Operations. He is also a Programme Leader of Advanced Fuel Technology programme at NCCBM.

KPK Reddy is an energy auditor, Manager at Centre for Mining, Environment, Plant Engineering and Operations. He is also a member of Project Engineering and System Design at NCCBM.

Moon Chourasia is a Project Scientist at the Centre for Mining, Environment, Plant Engineering and Operations at NCCBM.

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. He has executed more than 50 major industrial R&D projects.
Concrete
Merlin Prime Spaces Acquires 13,185 Sq M Land Parcel In Pune
Rs 273 crore purchase broadens the developer’s Pune presence
Published
3 days agoon
March 6, 2026By
admin
Merlin Prime Spaces (MPS) has acquired a 13,185 sq m land parcel in Pune for Rs 273 crore, marking a notable expansion of its footprint in the city.
The transaction value converts to Rs 2,730 mn or Rs 2.73 bn.
The parcel is located in a strategic area of Pune and the firm described the acquisition as aligned with its growth objectives.
The deal follows recent activity in the region and will be watched by investors and developers.
MPS said the acquisition will support its planned development pipeline and enable delivery of commercial and residential space to meet local demand.
The company expects the site to provide flexibility in product design and phased development to respond to market conditions.
The move reflects an emphasis on land ownership in key suburban markets.
The emphasis on land acquisition reflects a strategy to secure inventory ahead of demand cycles.
The purchase follows a period of sustained investor interest in Pune real estate, driven by expanding office ecosystems and residential demand from professionals.
MPS will integrate the new holding into its existing portfolio and plans to engage with local authorities and stakeholders to progress approvals and infrastructure readiness.
No financial partners were disclosed in the announcement.
The firm indicated that timelines will depend on approvals and prevailing market conditions.
Analysts note that strategic land acquisitions at scale can help developers manage costs and timelines while preserving optionality for future projects.
MPS will now hold an enlarged land bank in the region as it pursues growth, and the acquisition underlines continued corporate appetite for measured expansion in second tier cities.
The company intends to move forward with detailed planning in the coming months.
Stakeholders will assess how the site is positioned relative to existing infrastructure and connectivity.
Concrete
Adani Cement and Naredco Partner to Promote Sustainable Construction
Collaboration to focus on skills, technology and greener practices
Published
3 days agoon
March 6, 2026By
admin
Adani Cement has entered a strategic partnership with the National Real Estate Development Council (Naredco) to support India’s construction needs with a focus on sustainability, workforce capability and modern building technologies. The collaboration brings together Adani Cement’s building materials portfolio, research and development strengths and technical expertise with Naredco’s nationwide network of more than 15,000 member organisations. The agreement aims to address evolving demand across housing, commercial and infrastructure sectors.
Under the partnership, the organisations will roll out skill development and certification programmes for masons, contractors and site supervisors, with training to emphasise contemporary construction techniques, safety practices and quality standards. The programmes are intended to improve project execution and on-site efficiency and to raise labour productivity through standardised competencies. Emphasis will be placed on practical training and certification pathways that can be scaled across regions.
The alliance will function as a platform for knowledge sharing and technology exchange, facilitating access to advanced concrete solutions, innovative construction practices and modern materials. The effort is intended to enhance structural durability, execution quality and environmental responsibility across developments while promoting adoption of low-carbon technologies and green cement alternatives. Companies expect these measures to contribute to longer term resilience of built assets.
Senior executives conveyed that the partnership reflects a shared commitment to strengthening quality and sustainability in construction and that closer engagement with developers will help integrate advanced materials and technical support throughout the project lifecycle. Leadership noted the need for responsible construction practices as urbanisation accelerates and indicated that the association should encourage wider adoption of green building norms and collaboration within the real estate and construction ecosystem.
The organisations said they will also explore integrated building solutions, including ready-mix concrete offerings, while supporting initiatives aligned with affordable and inclusive housing. The partnership will progress through engagements, conferences and joint training programmes targeting rapidly urbanising cities and growth centres where demand for efficient and environmentally responsible construction grows. Naredco, established under the aegis of the Ministry of Housing and Urban Affairs, will leverage its policy and advocacy role to support implementation.
Operational excellence in cement is no longer about producing more—it is about producing smarter, cleaner and more reliably, where cost per tonne meets carbon per tonne.
Operational excellence in cement has moved far beyond the old pursuit of ‘more tonne’. The new benchmark is smarter, cleaner, more reliable production—delivered with discipline across process, people and data. In an industry where energy can account for nearly 30 per cent of manufacturing cost, even marginal gains translate into meaningful value. As Dr SB Hegde, Professor, Jain College of Engineering & Technology, Hubli and Visiting Professor, Pennsylvania State University, USA, puts it, “Operational excellence… is no longer about producing more. It is about producing smarter, cleaner, more reliably, and more sustainably.” The shift is structural: carbon per tonne will increasingly matter as much as cost per tonne, and competitiveness will be defined by the ability to stabilise operations while steadily lowering emissions.
From control rooms to command centres
The modern cement plant is no longer a handful of loops watched by a few operators. Control rooms have evolved from a few hundred signals to thousands—today, up to 25,000 signals can compete for attention. Dr Rizwan Sabjan, Head – Global Sales and Proposals, Process Control and Optimization, Fuller Technologies, frames the core problem plainly: plants have added WHRS circuits, alternative fuels, higher line capacities and tighter quality expectations, but human attention remains finite. “It is very impossible for an operator to operate the plant with so many things being added,” he says. “We need somebody who can operate 24×7… without any tiredness, without any distraction… The software can do that for us better.”
This is where advanced process control shifts from ‘automation spend’ to a financial lever. Dr Hegde underlines the logic: “Automation is not a technology expense. It is a financial strategy.” In large kilns, a one per cent improvement is not incremental—it is compounding.
Stability is the new productivity
At the heart of operational excellence lies stability. Not because stability is comfortable, but because it is profitable—and increasingly, low-carbon. When setpoints drift and operators chase variability, costs hide in refractory damage, thermal shocks, stop-start losses and quality swings. Dr Sabjan argues that algorithmic control can absorb process disturbances faster than any operator, acting as ‘a co-pilot or an autopilot’, making changes ‘as quick as possible’ rather than waiting for manual intervention. The result is not just fuel saving—it is steadier operation that extends refractory life and reduces avoidable downtime.
The pay-off can be seen through the lens of variability: manual operation often amplifies swings, while closed-loop optimisation tightens control. As Dr Sabjan notes, “It’s not only about savings… there are many indirect benefits, like increasing the refractory life, because we are avoiding the thermal shocks.”
Quality control
If stability is the base, quality is the multiplier. A high-capacity plant can dispatch enormous volumes daily, and quality cannot be a periodic check—it must be continuous. Yet, as Dr Sabjan points out, the biggest error is not in analysis equipment but upstream: “80 per cent of the error is happening at the sampling level.” If sampling is inconsistent, even the best XRF and XRD become expensive spectators.
Automation closes the loop by standardising sample collection, transport, preparation, analysis and corrective action. “We do invest a lot of money on analytical equipment like XRD and XRF, but if it is not put on the closed loop then there’s no use of it,” he says, because results become person-dependent and slow.
Raju Ramachandran, Chief Manufacturing Officer (East), Nuvoco Vistas Corp, reinforces the operational impact from the plant floor: “There’s a stark difference in what a RoboLab does… ensuring that the consistent quality is there… starts right from the sample collection.” For him, automation is not about removing people; it is about making outcomes repeatable.
Human-centric automation
One of the biggest barriers to performance is not hardware—it is fear. Dr Sabjan describes a persistent concern that digital tools exist to replace operators. “That’s not the way,” he says. “The technology is here to help operator… not to replace them… but to complement them.” The plants that realise this early tend to sustain performance because adoption becomes collaborative rather than forced.
Dr Hegde adds an important caveat: tools can mislead without competence. “If you don’t have the knowledge about the data… this will mislead you… it is like… using ChatGPT… it may tell the garbage.” His point is not anti-technology; it is pro-capability. Operational excellence now requires multidisciplinary teams—process, chemistry, physics, automation and reliability—working as one.
GS Daga, Managing Director, SecMec Consultants, takes the argument further, warning that the technology curve can outpace human readiness: “Our technology movement AI will move fast, and our people will be lagging behind.” For him, the industry’s most urgent intervention is systematic skilling—paired with the environment to apply those skills. Without that, even high-end systems remain underutilised.
Digital energy management
Digital optimisation is no longer confined to pilots; its impact is increasingly quantifiable. Raghu Vokuda, Chief Digital Officer, JSW Cement, describes the outcomes in practical terms: reductions in specific power consumption ‘close to 3 per cent to 7 per cent’, improvements in process stability ‘10 per cent to 20 per cent’, and thermal energy reductions ‘2–5 per cent’. He also highlights value beyond the process line—demand optimisation through forecasting models can reduce peak charges, and optimisation of WHRS can deliver ‘1 per cent to 3 per cent’ efficiency gains.
What matters is the operating approach. Rather than patchwork point solutions, he advocates blueprinting a model digital plant across pillars—maintenance, quality, energy, process, people, safety and sustainability—and then scaling. The difference is governance: defined ownership of data, harmonised OT–IT integration, and dashboards designed for each decision layer—from shopfloor to plant head to network leadership.
Predictive maintenance
Reliability has become a boardroom priority because the cost of failure is blunt and immediate. Dr Hegde captures it crisply: “One day of kiln stoppage can cost several crores.” Predictive maintenance and condition monitoring change reliability from reaction to anticipation—provided plants invest in the right sensors and a holistic architecture.
Dr Sabjan stresses the need for ‘extra investment’ where existing instrumentation is insufficient—kiln shell monitoring, refractory monitoring and other critical measurements. The goal is early warning: “How to have those pre-warnings… where the failures are going to come… and then ensure that the plant availability is high, the downtime is low.”
Ramachandran adds that IoT sensors are increasingly enabling early intervention—temperature rise in bearings, vibration patterns, motor and gearbox signals—moving from prediction to prescription. The operational advantage is not only fewer failures, but planned shutdowns: “Once the shutdown is planned in advance… you have lesser… unpredictable downtimes… and overall… you gain on the productivity.”
Alternative fuels and raw materials
As decarbonisation tightens, AFR becomes central—but scaling it is not simply a procurement decision. Vimal Kumar Jain, Technical Director, Heidelberg Cement, frames AFR as a structured programme built on three foundations: strong pre-processing infrastructure, consistent AFR quality, and a stable pyro process. “Only with the fundamentals in place can AFR be scaled safely—without compromising clinker quality or production stability.”
He also flags a ground reality: India’s AFR streams are often seasonal and variable. “In one season to another season, there is major change… high variation in the quality,” he says, making preprocessing capacity and quality discipline mandatory.
Ramachandran argues the sector also needs ecosystem support: a framework for AFR preprocessing ‘hand-in-hand’ between government and private players, so fuels arrive in forms that can be used efficiently and consistently.
Design and execution discipline
Operational excellence is increasingly determined upstream—by the choices made in concept, layout, technology selection, operability and maintainability. Jain puts it unambiguously: “Long term performance is largely decided before the plant is commissioned.” A disciplined design avoids bottlenecks that are expensive to fix later; disciplined execution ensures safe, smooth start-up with fewer issues.
He highlights an often-missed factor: continuity between project and operations teams. “When knowledge transfer is strong and ownership carries beyond commissioning, the plant stabilises much faster… and lifecycle costs reduce significantly.”
What will define the next decade
Across the value chain, the future benchmark is clear: carbon intensity. “Carbon per ton will matter as much as cost per ton,” says Dr Hegde. Vokuda echoes it: the industry will shift from optimising cost per tonne to carbon per ton.
The pathway, however, is practical rather than idealistic—low-clinker and blended cements, higher thermal substitution, renewable power integration, WHRS scaling and tighter energy efficiency. Jain argues for policy realism: if blended cement can meet quality, why it shall not be allowed more widely, particularly in government projects, and why supplementary materials cannot be used more ambitiously where performance is proven.
At the same time, the sector must prepare for CCUS without waiting for it. Jain calls for CCUS readiness—designing plants so capture can be added later without disruptive retrofits—while acknowledging that large-scale rollout may take time as costs remain high.
Ultimately, operational excellence will belong to plants that integrate—not isolate—the levers: process stability, quality automation, structured AFR, predictive reliability, disciplined execution, secure digitalisation and continuous learning. As Dr Sabjan notes, success will not come from one department owning the change: “Everybody has to own it… then only… the results could be wonderful.”
And as Daga reminds the industry, the future will reward those who keep their feet on the ground while adopting the new: “I don’t buy technology for the sake of technology. It has to make a commercial sense.” In the next decade, that commercial sense will be written in two numbers—cost per tonne and carbon per tonne—delivered through stable, skilled and digitally disciplined operations.
Merlin Prime Spaces Acquires 13,185 Sq M Land Parcel In Pune
Adani Cement and Naredco Partner to Promote Sustainable Construction
Operational Excellence Redefined!
World Cement Association Annual Conference 2026 in Bangkok
Assam Chief Minister Opens Star Cement Plant In Cachar
Merlin Prime Spaces Acquires 13,185 Sq M Land Parcel In Pune
Adani Cement and Naredco Partner to Promote Sustainable Construction
Operational Excellence Redefined!
World Cement Association Annual Conference 2026 in Bangkok


