Product development
IMPROVING EFFICIENCY
Published
4 years agoon
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??urn almost anything??is the tagline that is used in pyro processing nowadays. This line only indicates the challenges faced by the machinery suppliers who are involved in pyro processing. With alternate fuels gaining momentum day by day, the challenge is becoming intense.
The kiln is the heart of a cement plant. Any efficiency gains in the kiln system or pyro process can lead to significant savings in fuel costs and power costs ??reducing overall operating expenses. In today?? world, there is a wide range of firing systems, starting from kiln burners to alternative fuel to pre calciners to various combustion devices. One needs to zero down on the requirements to have a perfect system. Pyro processing has remained the important part of plant operations.
The present cement machinery suppliers have been designing the products and services around space utilisation, energy consumption and emission reduction.
In the current issue, we have covered an interview with the Daniel Julien, CEO of Fives Pillard. Fives is a French multinational company having operations in India. The burners designed by Fives have been in use in our country for about three to four decades.
Similarly, pyro processing systems supplied by FLSmidth, KHD and thyssenkrupp have been equally popular. All the three major machinery suppliers like FLSmidth, KHD and thyssenkrupp have their own designs of pyro processing systems that are in use in the cement plants. The burning system suppliers have realised that fuels either to kilns or calciners vary in quality and in size to a large extent. The design of firing system should be such that it can accept all the variations in coal or alternate fuels. Different kind of hardware have been designed for that. These can be added even in the existing plants to feed the alternate fuels. A specially-designed equipment can be opted for the use of alternate fuel in calciners.
Let us take a broad view of the various options available in the pyro processing. The size of the kiln is generally decided based on the limestone reserve available. The other considerations are market size and availability of funds. The kiln size is determined keeping in view future expansion plans. If the market grows; there is always a margin left in the design to expand or may be even double the capacity of the kiln output. The designer of kilns has to take into account the investment cost and operating cost. The systems that score better on these parameters have gained excellent reputation.
In the modern design, the length of the kiln has been reduced because the calcining part of the reaction is done outside the kiln. There is continuous improvement happening on the design of calciners. When AFR is designed to be used in calciners, the design of calciners has to accommodate the use. Attention is paid to get low NOx calciner, which is supposed to be the advanced version. Today Computational Fluid Dynamics (CFD ) is commonly used while designing the hardware like pre heater and pre calciner. The buyer also ensures that he shall get the upgrades at reasonable costs. The low NOx calciner is the need of the hour. The design of calciner should be such that it can be adapted in the old plants as well along with new installations.
Over a period of time there has been a significant improvement in the pre heater and pre calciners of the kiln system so as to reduce the length of the kiln. It serves two-fold purpose 1) the length of kiln is shortened, the cost is reduced and 2) through put of the kiln improves. Day-by-day, the margins in design are getting reduced and the equipment supplied are operating closer to the limit values.
While considering the rotation of a rotary kiln, we have to appreciate that the kiln is lined in side with refractories, and one has to pay attention to the life of the refractory while considering the performance of pyro processing. By a rule of thumb, for the life of refractory, lining is around one year, which may slightly vary depending on the situation. General preference is given to have basic bricks for burning zone and alumina bricks in the rest of the kiln.
The other subject that is debated about the kilns is if it is having two tire stations or three tire stations. A tire station is nothing but the support on which the kiln is resting. The present trend is to go two tire stations. In this case length to diameter ratio of approx. 11:1 to 12:1. The investment cost is approximately lower by 15 per cent. The three-station kiln is an established and proven design and has been thoroughly tried and tested over the decades. The three-station rotary kiln system has relatively a balanced design that ensures stiffness and minimises wobbling and misalignment.
The other important part of the kiln is drive unit. The drive units consist of the main and auxiliary drive. Variable speed AC or DC motors are used as drive motors. The auxiliary drive is furnished with an electric motor and/or a combustion engine. In conjunction with multi-stage or planetary gearboxes and elastic, practically maintenance-free couplings, the drives offer maximum operational safety and efficiency.
The drives for all kilns are designed for the reliable operation of the kiln under any operating conditions. This means that even greater safety factors and torque reserve, are installed for nominal operation. All drive components are designed for the installed motor torque plus all safety factors and not only for effective torque generated at nominal capacity. Kiln suppliers offer various types of drives for kilns operation, depending on the application. The installed reserves and safety factors ensure the extremely flexible operation of the kiln, including higher clinker throughput, without overloading the drive.
FLSmidth advocates that some of the kiln outlet sections to be kept as spares with refractory lining already completed. It says ??on?? waste time on costly kiln stops to make repairs?? Our replaceable components can prolong the lifetime of kiln outlet sectors and drastically reduce replacement time. Replacing a damaged sector is easy. Reduce the costly downtime by having a second set of replaceable sectors ready to go for scheduled stoppages.
Keep false air out, hot gas in with our innovative graphite kiln seal. This innovative graphite rotary kiln sealing system can make any existing kiln more efficient by optimising pressure stability and reducing the release of hot gasses and dust particles. Its modular frame allows for pre-assembly, which means fast, easy installation with minimal downtime.
The increasing use of alternative fuels has brought the subject of safety to the forefront at many cement plants, especially the hazards related to the storage and transportation of fuels, structural failures of fly ash silos/coal bins, explosion in kilns and coal mills, etc., underline the importance of process safety management that needs to be addressed very seriously.
While Process Safety Management (PSM) is predominantly adopted in process industries such as the oil and gas sectors, its implementation in the cement industry helps plant personnel systematically identify and mitigate process hazards. Various studies have shown that there is enough scope for improving overall process safety in the cement plants.
– VIKAS DAMLE
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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.
Concrete
Indian cement industry is well known for its energy and natural resource efficiency
Published
2 years agoon
November 18, 2022By
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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.
Concrete
NTPC selects Carbon Clean and Green Power for carbon capture facility
Published
2 years agoon
October 12, 2022By
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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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Organisations valuing gender diversity achieve higher profitability
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Global Start-Up Challenge Launched to Drive Net Zero Concrete Solutions
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StarBigBloc Acquires Land for AAC Blocks Greenfield Facility in Indore
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Ministry of Steel Organises Chintan Shivir for CPSE leaders
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World Cement Association Calls for Industry Action
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Organisations valuing gender diversity achieve higher profitability
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StarBigBloc Acquires Land for AAC Blocks Greenfield Facility in Indore
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Ministry of Steel Organises Chintan Shivir for CPSE leaders
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World Cement Association Calls for Industry Action
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