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Large capacity VRMs with multi drives will be the preferred option

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YV Satyamurthy, Consultant
As a consultant for cement, lime and mineral industry, YV Satyamurthy believes that the statutory requirement of reporting of SOx & NOx along with SPM compels the industry to install CEMS for all the stacks.

What have been the noticeable technological advancements in cement manufacturing that have taken place in the last decade?
Over the last one decade, no major technological breakthroughs have taken place. However, as the plants have to be operated more energy efficiently while complying with stringent regulatory norms for emission control and safety, the technology suppliers have come out with ‘Innovations’ for improvements on this front. Further, competitive in the market place, the technology development was driven by incorporation of automation systems for better process control, reduction in manpower and reliability of plants for continuous operation.

One more challenge for the technology suppliers was to come with technologies, which are in sized for higher capacities but when the plants have to be operated at lower capacities (due to market conditions), while maintaining higher efficiency parameters.

Some of the major technological innovations made during this decade are:

  • Plants are designed and operated at capacities as high as 14,000 TPD Clinker production
  • ILC technology with ‘Low Pressure’ drop for six stage ‘Pre Heaters’ continues to be most preferred option for pyro-processing, irrespective of capacity of plant
  • Multi-drive systems for vertical roller mills (e.g. MVR of Pfieffer or QMS-RD of Polysius) have become a major feature, which eliminated the risk with failure of high HP gearboxes for VRMs. This has made designing the VRMs for very high capacity cement grinding systems (one mill of capacity 3 MTPA)
  • Developments of technologies for AFR processing and firing inside the kilns/calciners
  • Robo-labs for in process quality control
  • Online sampling and analytical systems for in process quality control (like free lime analysers at Cooler inlet, online sampling and analysis by XRF)
  • Traffic management in packing plants with RF tagging of vehicles for optimising the packer outputs
  • Wagon tipplers for unloading capacities of approximately 2,000 TPH as against approxi?mately 1,000 tonnes
  • Design for energy efficient grinding of pet coke
  • Modular design grinding plants for production of (capacity up to 300,000 TPH) by End users at construction sites
  • Online condition monitoring systems for high capacity VRMs
  • Online emission monitoring systems (CEMS)
  • Prefabricated sheds for storage areas
  • Installation of reliable construction lifts for regular operation and maintenance in kiln/silos areas
  • Online particle size analysers are also installed in many of the installation abroad and few plants in India for process control in grinding systems

What is the progress done to reduce overall energy consumption in manufacturing?
Implementation of PAT scheme has made the industry to focus on energy consumption and implement projects of retrofitting/replacement and upgradations to reduce the energy consumption to derive the benefits of this scheme. Taking into account various technological advances made in mechanical conveying systems made the industry to eliminate/minimise the use of pneumatic conveying systems. Many of the old plants have upgraded their process control systems during the period to latest configurations to have sustained kiln operations.

Are you satisfied with the research done on use of low grade limestone and use of ash coal?
A number of initiatives by R&D centres/technology suppliers are required on this topic. Especially, more reliable systems (wobblers), which can work for higher moisture content of limestone are required for removal of clay/siliceous materials from ROM limestone. Research needs to be done for utilisation of High Cl content Lime Stone (Gujarat (Kutch area)/Rajasthan) and its implications on bypass systems and utilisation over burden Bypass ESP dust.

What are the recent developments in pyro processing?

  • Increase of top stage of PH system by distribution rotating disc
  • Separate combustion chamber (e.g. hot disc/step combustor) before pre-calciner for firing RDF (refuse derived fuel)/AFR for better combustion efficiency with clean air entry at high temperature
  • High flame momentum burners (up to 11N/MW)
  • Technology development for prevention/solutions of operational problem such as Snowmen (e.g. Air blast cooler), coating on fan blades, pet coke/AFR grinding/firing systems.
  • Waste Heat recovery by power generation has become a standard industrial practice for greenfield plants
  • Bag house instead of ESPs for cooler exit gases
  • Online free lime sampling at cooler inlet and testing systems for process control
  • Online measurement of production rate on Product conveyors to clinker silo
  • Reliable online measurement of kiln inlet gas analyser for O2 and CO
  • Roller crusher at cooler discharge has become a standard solution for cooler designs

What are your views on the use of fuzz logic and expert systems in kiln and mill operations?
The expert systems and fuzz logic systems for kiln and mill operation have become a standard design feature in all the technology suppliers. However, as the technology suppliers are keeping a very high price for supply of such systems, except for plants, which are above 6,000 TPD capacity, the cement companies are not keen on buying the systems.

How about the use of pet coke on the backdrop of recent ban in Delhi NCR region?
World over, pet coke has been utilised (up to 100 per cent) in cement kilns and cement producers are able to keep the SOx emissions within prescribed limits. However, considering the high Sulphur content in Pet coke supplied by Indian companies, it may be needed to install SOx control systems for Kiln exit gases.

What are the changes you can point out in grinding process?

  • Ball mill systems: Except for small capacity plants, ball mill systems are not preferred for any projects. However, to start with ball mill and later on upgrading with Roller Press for energy efficiency is how cement projects are designed
  • Vertical roller mills or roll press (in finish grinding/semi-finish grinding) is the most preferred choice across all types of cement grinding
  • Large capacity vertical roller mills with multi drives are going to be most preferred option by industry in future
  • Only in areas where water shortage is there for spraying into VRMS (especially for PPC production), roller press systems with ball mill can be a preferred option
  • VRM suppliers have also now come out with designs utilising water spray only for starting the mill for PPC grinding. However, these designs are yet to proven for different Clinker granulometry/hardness

What is your take on continuous emission monitoring system (CEMS)?
The statutory requirement of reporting of SOx and NOx along with SPM compels the industry to install CEMS for all the stacks. As the suppliers of CEMS are already established, proven designs in Europe, there is no problem of choosing a reliable system by the industry.

What are the measures taken to reduce gaseous and dust pollution?
SNCR systems using Ammonia for control of NOx will become a compulsory requirement for the industry and already many of the major cement companies are installing these systems. The designs of bag filters/houses available for achieving < than 10 mg/NM3 is sufficiently adequate to operate the plants below prescribed limits in future. Many plants have already operating at below prescribed limits. Cooler exhaust dedusting through bag houses instead of ESP have to adapted by all the cement producers to meet the prescribed limits. SOx emission control systems only for High S (>5 per cent) petcoke have to be adopted by industry after mapping the present SOx levels for different quality of pet coke. Though all process Stack emissions by the industry are in general, below the present prescribed norms, the fugitive dust emissions and proper design/maintenance of auxiliary bag filters is continue to be a major concern in industry. For plants located in water shortage areas and for opening unloading/storage areas, one option is to go for dry fog systems.

How far has been the penetration of robotic labs for quality control? Comment specifically on sample collection and real time analysis.
The penetration of Robo-lab system is not very encouraging in the Indian cement industry. Wherever these systems are installed, the unresolved issues of maintenance and procurement of spares have become a major concern for reliable operation of the system. Industry is not interested in installation Robo-lab systems due to high CAPEX and negative feedback from clients. However, mechanised sample collection and conveying systems are becoming more and more acceptable, as they reduce the sampling bias and transportation time. Few plants have also installed online analysers (Neutron/Gamma Ray) systems and also online sampling with in-situ XRF/Free lime analysers. Considering CAPEX and reliability view point, it appears these systems are more attractive. On-line Particle size analysers are also installed in many of the installation abroad and few plants in India for process control in grinding systems and this is one the developments.

What about the automation done in the physical testing of cement?
Automation done in the physical testing of cement in modern plants is quite sophisticated. The test results are directly recorded without manual interface and the data goes to MIS system through SAP for review by the top management. Hence there is no chance for bias in reporting. However, this needs a good calibration procedure for the testing machine, duly witnessed and verified at 2-3 levels in the organisation.

What technological gaps you see in plants in India and that in Europe?
As far as major process technology absorption is concerned, the Indian cement industry has state-of-the-art technologies implemented in latest plants of large capacities. However, few gaps do exist in old plants, for which there is a need for absorption of technologies through upgradation or replacements. AFR utilisation technologies are more developed in Europe and some of the plants even achieving 100 per cent; whereas in India, it is in nascent stage.

What are the steps taken to reduce dust and mitigation of CO2 emission per unit of cement in the present system or by way of development of a new product?
As on date, no carbon capturing technology is developed by industry with respect to capturing CO2 through an absorption process. However, a large reduction in clinker factor in cement is achieved through production of more percentage of blended cement and higher levels of absorption of slag and fly ash absorption in cement. A long pending issue of BIS standard for Portland Limestone Cement, where in it is possible to use more than 10 per cent of Limestone in cement is overdue, which can substantially reduced CO2/T of cement. "Carbon Cure, Canada" & "Solidia, US" are two of the major CO2 capturing technologies, which have already completed pilot studies and plan commercialise the technologies.

Is use of simulation based learning for skill upgradation happening in cement?
As in the case of expert system implementation in cement plants, though the simulation based learning is much talked about by industry, it is not fully adopted by the Indian industry. Though vendors offer simulator-based training to end-users, it is very expensive. As manpower costs in packing/bagging and loading are going up, many of the cement plants are revamping the existing systems with semi-automatic and automatic bag loading systems. Proven technological solutions are available and industry is very much focussed in this area.

YV Satyamurthy has an experience of 35 years in functional areas, viz project management for cement and mineral projects, cement plant operations, process and quality Control, EPC contracts, energy management, overseas consultancy services and technical training development.

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Economy & Market

Impactful Branding

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Advertising or branding is never about driving sales. It’s about creating brand awareness and recall. It’s about conveying the core values of your brand to your consumers. In this context, why is branding important for cement companies? As far as the customers are concerned cement is simply cement. It is precisely for this reason that branding, marketing and advertising of cement becomes crucial. Since the customer is unable to differentiate between the shades of grey, the onus of creating this awareness is carried by the brands. That explains the heavy marketing budgets, celebrity-centric commercials, emotion-invoking taglines and campaigns enunciating the many benefits of their offerings.
Marketing strategies of cement companies have undergone gradual transformation owing to the change in consumer behaviour. While TV commercials are high on humour and emotions to establish a fast connect with the customer, social media campaigns are focussed more on capturing the consumer’s attention in an over-crowded virtual world. Branding for cement companies has become a holistic growth strategy with quantifiable results. This has made brands opt for a mix package of traditional and new-age tools, such as social media. However, the hero of every marketing communication is the message, which encapsulates the unique selling points of the product. That after all is crux of the matter here.
While cement companies are effectively using marketing tools to reach out to the consumers, they need to strengthen the four Cs of the branding process – Consumer, Cost, Communication and Convenience. Putting up the right message, at the right time and at the right place for the right kind of customer demographic is of utmost importance in the long run. It is precisely for this reason that regional players are likely to have an upper hand as they rely on local language and cultural references to drive home the point. But modern marketing and branding domain is exponentially growing and it would be an interesting exercise to tabulate and analyse its impact on branding for cement.

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Concrete

Indian cement industry is well known for its energy and natural resource efficiency

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Dr Hitesh Sukhwal, Deputy General Manager – Environment, Udaipur Cement Works Limited (UCWL) takes us through the multifaceted efforts that the company has undertaken to keep emissions in check with the use of alternative sources of energy and carbon capture technology.

Tell us about the policies of your organisation for the betterment of the environment.
Caring for people is one of the core values of our JK Lakshmi Cement Limited. We strongly believe that we all together can make a difference. In all our units, we have taken measures to reduce carbon footprint, emissions and minimise the use of natural resources. Climate change and sustainable development are major global concerns. As a responsible corporate, we are committed with and doing consistent effort small or big to preserve and enrich the environment in and around our area of operations.
As far as environmental policies are concerned, we are committed to comply with all applicable laws, standards and regulations of regulatory bodies pertaining to the environment. We are consistently making efforts to integrate the environmental concerns into the mainstream of the operations. We are giving thrust upon natural resource conservation like limestone, gypsum, water and energy. We are utilising different kinds of alternative fuels and raw materials. Awareness among the employees and local people on environmental concerns is an integral part of our company. We are adopting best environmental practices aligned with sustainable development goals.
Udaipur Cement Works Limited is a subsidiary of the JK Lakshmi Cement Limited. Since its inception, the company is committed towards boosting sustainability through adopting the latest art of technology designs, resource efficient equipment and various in-house innovations. We are giving thrust upon renewable and clean energy sources for our cement manufacturing. Solar Power and Waste Heat Recovery based power are our key ingredients for total power mix.

What impact does cement production have on the environment? Elaborate the major areas affected.
The major environmental concern areas during cement production are air emissions through point and nonpoint sources due to plant operation and emissions from mining operation, from material transport, carbon emissions through process, transit, noise pollution, vibration during mining, natural resource depletion, loss of biodiversity and change in landscape.
India is the second largest cement producer in the world. The Indian cement industry is well known for its energy and natural resource efficiency worldwide. The Indian cement industry is a frontrunner for implementing significant technology measures to ensure a greener future.
The cement industry is an energy intensive and significant contributor to climate change. Cement production contributes greenhouse gases directly and indirectly into the atmosphere through calcination and use of fossil fuels in an energy form. The industry believes in a circular economy by utilising alternative fuels for making cement. Cement companies are focusing on major areas of energy efficiency by adoption of technology measures, clinker substitution by alternative raw material for cement making, alternative fuels and green and clean energy resources. These all efforts are being done towards environment protection and sustainable future.
Nowadays, almost all cement units have a dry manufacturing process for cement production, only a few exceptions where wet manufacturing processes are in operation. In the dry manufacturing process, water is used only for the purpose of machinery cooling, which is recirculated in a closed loop, thus, no polluted water is generated during the dry manufacturing process.
We should also accept the fact that modern life is impossible without cement. However, through state-of-the-art technology and innovations, it is possible to mitigate all kinds of pollution without harm to the environment and human beings.

Tell us about the impact blended cement creates on the environment and emission rate.
Our country started cement production in 1914. However, it was introduced in the year 1904 at a small scale, earlier. Initially, the manufacturing of cement was only for Ordinary Portland Cement (OPC). In the 1980s, the production of blended cement was introduced by replacing fly ash and blast furnace slag. The production of blended cement increased in the growth period and crossed the 50 per cent in the year 2004.
The manufacturing of blended cement results in substantial savings in the thermal and electrical energy consumption as well as saving of natural resources. The overall consumption of raw materials, fossil fuel such as coal, efficient burning and state-of-the-art technology in cement plants have resulted in the gradual reduction of emission of carbon dioxide (CO2). Later, the production of blended cement was increased in manifolds.
If we think about the growth of blended cement in the past few decades, we can understand how much quantity of , (fly ash and slag) consumed and saved natural resources like limestone and fossil fuel, which were anyhow disposed of and harmed the environment. This is the reason it is called green cement. Reduction in the clinker to cement ratio has the second highest emission reduction potential i.e., 37 per cent. The low carbon roadmap for cement industries can be achieved from blended cement. Portland Pozzolana Cement (PPC), Portland Slag Cement (PSC) and Composite Cement are already approved by the National Agency BIS.
As far as kilogram CO2 per ton of cement emission concerns, Portland Slag Cement (PSC) has a larger potential, other than PPC, Composite Cement etc. for carbon emission reduction. BIS approved 60 per cent slag and 35 per cent clinker in composition of PSC. Thus, clinker per centage is quite less in PSC composition compared to other blended cement. The manufacturing of blended cement directly reduces thermal and process emissions, which contribute high in overall emissions from the cement industry, and this cannot be addressed through adoption of energy efficiency measures.
In the coming times, the cement industry must relook for other blended cement options to achieve a low carbon emissions road map. In near future, availability of fly ash and slag in terms of quality and quantity will be reduced due to various government schemes for low carbon initiatives viz. enhance renewable energy sources, waste to energy plants etc.
Further, it is required to increase awareness among consumers, like individual home builders or large infrastructure projects, to adopt greener alternatives viz. PPC and PSC for more sustainable
resource utilisation.

What are the decarbonising efforts taken by your organisation?
India is the world’s second largest cement producer. Rapid growth of big infrastructure, low-cost housing (Pradhan Mantri Awas Yojna), smart cities project and urbanisation will create cement demand in future. Being an energy intensive industry, we are also focusing upon alternative and renewable energy sources for long-term sustainable business growth for cement production.
Presently, our focus is to improve efficiency of zero carbon electricity generation technology such as waste heat recovery power through process optimisation and by adopting technological innovations in WHR power systems. We are also increasing our capacity for WHR based power and solar power in the near future. Right now, we are sourcing about 50 per cent of our power requirement from clean and renewable energy sources i.e., zero carbon electricity generation technology. Usage of alternative fuel during co-processing in the cement manufacturing process is a viable and sustainable option. In our unit, we are utilising alternative raw material and fuel for reducing carbon emissions. We are also looking forward to green logistics for our product transport in nearby areas.
By reducing clinker – cement ratio, increasing production of PPC and PSC cement, utilisation of alternative raw materials like synthetic gypsum/chemical gypsum, Jarosite generated from other process industries, we can reduce carbon emissions from cement manufacturing process. Further, we are looking forward to generating onsite fossil free electricity generation facilities by increasing the capacity of WHR based power and ground mounted solar energy plants.
We can say energy is the prime requirement of the cement industry and renewable energy is one of the major sources, which provides an opportunity to make a clean, safe and infinite source of power which is affordable for the cement industry.

What are the current programmes run by your organisation for re-building the environment and reducing pollution?
We are working in different ways for environmental aspects. As I said, we strongly believe that we all together can make a difference. We focus on every environmental aspect directly / indirectly related to our operation and surroundings.
If we talk about air pollution in operation, every section of the operational unit is well equipped with state-of-the-art technology-based air pollution control equipment (BagHouse and ESP) to mitigate the dust pollution beyond the compliance standard. We use high class standard PTFE glass fibre filter bags in our bag houses. UCWL has installed the DeNOx system (SNCR) for abatement of NOx pollution within norms. The company has installed a 6 MW capacity Waste Heat Recovery based power plant that utilises waste heat of kiln i.e., green and clean energy source. Also, installed a 14.6 MW capacity solar power system in the form of a renewable energy source.
All material transfer points are equipped with a dust extraction system. Material is stored under a covered shed to avoid secondary fugitive dust emission sources. Finished product is stored in silos. Water spraying system are mounted with material handling point. Road vacuum sweeping machine deployed for housekeeping of paved area.
In mining, have deployed wet drill machine for drilling bore holes. Controlled blasting is carried out with optimum charge using Air Decking Technique with wooden spacers and non-electric detonator (NONEL) for control of noise, fly rock, vibration, and dust emission. No secondary blasting is being done. The boulders are broken by hydraulic rock breaker. Moreover, instead of road transport, we installed Overland Belt Conveying system for crushed limestone transport from mine lease area to cement plant. Thus omit an insignificant amount of greenhouse gas emissions due to material transport, which is otherwise emitted from combustion of fossil fuel in the transport system. All point emission sources (stacks) are well equipped with online continuous emission monitoring system (OCEMS) for measuring parameters like PM, SO2 and NOx for 24×7. OCEMS data are interfaced with SPCB and CPCB servers.
The company has done considerable work upon water conservation and certified at 2.76 times water positive. We installed a digital water flow metre for each abstraction point and digital ground water level recorder for measuring ground water level 24×7. All digital metres and level recorders are monitored by an in-house designed IoT based dashboard. Through this live dashboard, we can assess the impact of rainwater harvesting (RWH) and ground water monitoring.
All points of domestic sewage are well connected with Sewage Treatment Plant (STP) and treated water is being utilised in industrial cooling purposes, green belt development and in dust suppression. Effluent Treatment Plant (ETP) installed for mine’s workshop. Treated water is reused in washing activity. The unit maintains Zero Liquid Discharge (ZLD).
Our unit has done extensive plantations of native and pollution tolerant species in industrial premises and mine lease areas. Moreover, we are not confined to our industrial boundary for plantation. We organised seedling distribution camps in our surrounding areas. We involve our stakeholders, too, for our plantation drive. UCWL has also extended its services under Corporate Social Responsibility for betterment of the environment in its surrounding. We conduct awareness programs for employees and stakeholders. We have banned Single Use Plastic (SUP) in our premises. In our industrial township, we have implemented a solid waste management system for our all households, guest house and bachelor hostel. A complete process of segregated waste (dry and wet) door to door collection systems is well established.

Tell us about the efforts taken by your organisation to better the environment in and around the manufacturing unit.
UCWL has invested capital in various environmental management and protection projects like installed DeNOx (SNCR) system, strengthening green belt development in and out of industrial premises, installed high class pollution control equipment, ground-mounted solar power plant etc.
The company has taken up various energy conservation projects like, installed VFD to reduce power consumption, improve efficiency of WHR power generation by installing additional economiser tubes and AI-based process optimisation systems. Further, we are going to increase WHR power generation capacity under our upcoming expansion project. UCWL promotes rainwater harvesting for augmentation of the ground water resource. Various scientifically based WHR structures are installed in plant premises and mine lease areas. About 80 per cent of present water requirement is being fulfilled by harvested rainwater sourced from Mine’s Pit. We are also looking forward towards green transport (CNG/LNG based), which will drastically reduce carbon footprint.
We are proud to say that JK Lakshmi Cement Limited has a strong leadership and vision for developing an eco-conscious and sustainable role model of our cement business. The company was a pioneer among cement industries of India, which had installed the DeNOx (SNCR) system in its cement plant.

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Concrete

NTPC selects Carbon Clean and Green Power for carbon capture facility

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Carbon Clean and Green Power International Pvt. Ltd has been chosen by NTPC Energy Technology Research Alliance (NETRA) to establish the carbon capture facility at NTPC Vindhyachal. This facility, which will use a modified tertiary amine to absorb CO2 from the power plant’s flue gas, is intended to capture 20 tonnes of CO2) per day. A catalytic hydrogenation method will eventually be used to mix the CO2 with hydrogen to create 10 tonnes of methanol each day. For NTPC, capturing CO2 from coal-fired power plant flue gas and turning it into methanol is a key area that has the potential to open up new business prospects and revenue streams.

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