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Maximising waste heat recovery with FLSmidth Cross-Bar® Cooler

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Energy-related expenses in the cement sector, mostly on fuel and electricity, account for 30 to 40 percent of the industry?? cash costs. As cement producers are on the look-out to improve the efficiency of their equipment and reduce the energy costs, the utilisation of heat from clinker cooler to the waste heat recovery systems (WHRS) has become highly significant and an attractive proposition.

WHRS are revolutionary, energy-saving power generation systems that recover and reuse energy which enables greater energy security for cement companies in addition to adhering to the regulatory norms and policies.

The major challenge that comes along with WHRS via clinker cooler arrangement is to maintain maximum efficiency in both systems ??power generation through WHRS as well as the specific fuel consumption (SFC) in the pyro system. Hence, the performance of clinker coolers is not just about high recuperation efficiency anymore. With the experience and know-how of the FLSmidth cooler experts, the latest generation Cross-Bar Cooler has been developed with innovative features and has achieved many proven results for maximising heat recovery together with highest recuperation to the pyro process, enabling cement producers to achieve lowest operating costs.

Mid-air tapping

A significant factor to optimising the WHRS-clinker cooler system is the positioning of the mid-air/hot air tapping between the recuperation and the cooler vent. As indicated in the below diagrams, if the tapping is placed too close to tertiary air duct (TAD) in the recuperation zone for higher temperature hot air and hence higher heat recovery, it will take a toll on the recuperation temperatures and the cement producer will have to bear the hidden penalty of additional specific fuel consumption. As the tapping point cannot be altered, the consistency in the recuperation efficiency is another key to maximum heat recovery. FLSmidth Cross-Bar Cooler separates the clinker conveying and air distribution systems. Reciprocating bars effectively convey, mix and shear the clinker within the cooler and as the bars gradually wear over time, there is no effect on cooler operation and the thermal efficiency stays high. This also means that the heat output from mid-air tapping will be high and consistent. With the help of mid-air tapping, ~ 0.80-1 kg/kg cl at 390-415 degree centigrade heat can be utilised considering 76 percent thermal recuperation efficiency and 95kcal/kg cl standard cooler loss at grate loading ??2 tpd/m?*.

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Concrete

WCA’s annual conference

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At the World Cement Association’s annual conference the WCA Director, Emir Adiguzel addressed the global cement industry to outline the challenges and opportunities facing the global cement industry.

The conference held in Nanjing, had industry leaders, innovators and stakeholders in attendance to discuss the future of cement production and sustainability. The WCAA director emphasised on the cement industry’s stern commitment to sustainability; spoke about the global cement demand and market dynamics, projecting a period of stagnation from 2024-2030 with growth expected only in the Middle east, India and Africa; about the challenges and opportunities in carbon capture technology hat show promise but will need further development and substantial investment as well as about the strategic initiatives and collaboration within the industry in improving sustainability and operational performance.

Adiguzel concluded his address by highlighting the crucial point where the global cement industry stands by saying “Collaboration within the World Cement Association is essential for sharing knowledge and aligning on long-term objectives. Ensuring the industry’s resilience and adaptation to evolving market dynamics is crucial for the survival of independent cement producers”.

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Economy & Market

We are shaping the future of clean air

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Monil Parikh, Managing Director, Techflow Enterprises Pvt Ltd, leads us to a better understanding of how cutting-edge designs and advanced technologies are revolutionising the process of filtration, driving efficiency and environmental responsibility within the cement sector.

Tell us about your air pollution control systems.
Techflow Enterprises, operating from our expansive 30,000 sq m facility, which is one of India’s largest, manufactures a comprehensive suite of air pollution control systems specifically designed for cement plants. Our solutions include:

Pulse Jet Bag Filters: Employing compressed air for efficient cleaning, these capture fine dust particles generated during grinding and packing. Techflow’s bag filters are designed to restrict the outlet emission up to 5mg/Nm3.
Electrostatic Precipitators (ESPs): Ideal for ultra-fine particulate matter in kiln exhaust gases, ESPs utilise an electric field for superior dust capture with 99.9 per cent capacity.
Centrifugal Fans: We offer various fans like induced draft (ID) fans for draft creation, process fans for dust-laden air transport, and kiln fans for high-temperature gas streams.
Techflow’s commitment to quality is evident in our proven track record. We are actively supplying solutions to leading cement players like Adani Cements, Ambuja and ACC Cement, Dalmia Bharat Cement and Wonder Cement. Our installations across India and Asia stand as a testament to our expertise in handling cement plant dust control challenges.

How do your products and systems integrate with cement plants?
Techflow’s air pollution control systems seamlessly integrate into your existing cement plant. Our pulse jet bag filters fit effortlessly downstream of grinding mills and packing stations, effectively capturing fine dust particles generated during these processes. Electrostatic Precipitators (ESPs) excel in kiln exit gas streams, working alongside existing cyclones to achieve ultra-fine particulate control, a critical step in maintaining clean air emissions.
Techflow’s comprehensive offering of centrifugal fans ensures a perfect fit for any application. Our ID fans seamlessly integrate into the kiln system, creating the necessary draft to pull exhaust gases through the air pollution control equipment. Process fans, strategically placed throughout the plant, efficiently convey dust-laden air from various generation points, like clinker coolers and raw material handling, towards the filtration units. This modular approach minimises disruption during installation and ensures optimal dust collection across your entire cement production process.
How do your innovative designs better the process of filtration at cement plants bringing efficiency to the process?
Techflow’s commitment to innovation translates to superior filtration efficiency and operational cost savings for cement plants. Our pulse jet bag filters incorporate features like:

  • High-efficiency filter media: Designed for specific dust types, this media minimises pressure drop across the filter, reducing energy consumption.
  • Improved flue gas entry design
  • Low Pressure Cleaning Systems
  • Optimised pulse cleaning systems: These systems efficiently dislodge dust cake buildup using compressed air, maximising filter media life, and minimising downtime.

Our ESPs utilise advanced electrode designs to enhance particle collection and reduce maintenance intervals. Furthermore, Techflow’s centrifugal fans are meticulously crafted for superior aerodynamic performance, leading to lower energy consumption and improved overall plant efficiency.
Techflow has developed a SMART-LINK automation module for better maintenance and real-time remote tracking of performance of each equipment. Cement plants equipped with Techflow’s systems experience reduced operational costs, minimised downtime and compliance with ever-evolving environmental regulations.

What is the key differentiator between traditional filters and modern filters?
Traditional bag filter systems often relied on manual cleaning methods, leading to inconsistent performance, increased downtime, and potential worker exposure to dust. Modern pulse jet bag filters, like those offered by Techflow, address these limitations.
Our systems leverage automated cleaning mechanisms, ensuring consistent filtration efficiency and minimal operator intervention. Additionally, advanced filter media materials in Techflow’s bag filters offer superior dust capture capabilities compared to traditional fabric filters.
This commitment to modern technology translates to a safer and more efficient and environmentally friendly dust control solution for cement plants.

Can your designs be customised as per the requirement of the customers?
At Techflow, we understand that every cement plant has unique dust control requirements. That is why we prioritise customisation across our entire product range:

Pulse Jet Bag Filters: Filter media type and micron rating based on dust properties, number of filter bags, and pulse cleaning system configuration like cycle time and pressure can all be adjusted to optimise performance for your specific dust and airflow. The system can be designed to achieve less than 5mg/Nm3 outlet emission standards as well.

  • Electrostatic Precipitators (ESP): ESP design can be customised with features like the number of electrode rows, electrode spacing, and power input like voltage and current to achieve the desired dust collection efficiency for your specific outlet emission capacity less than 20mg/Nm3.
  • Centrifugal Fans: Fan designs are tailored by adjusting factors like impeller diameter, blade design, and motor size to meet the specific pressure and flow requirements of various processes within a cement plant.

This focus on customisation ensures Techflow’s air pollution control systems perfectly match your cement plant’s needs, guaranteeing optimal dust capture and efficient operation.

What is the role of technology and automation in building filtration systems?
Techflow has designed a SMART-LINK System that can be integrated to our equipment which tracks and monitors performance of equipment in real time.

  • Continuous diagnostics
  • Condition-based maintenance
  • Prevention of unplanned downtime
  • Early problem detection using AI
  • Data collection for process optimisation and efficiency maximisation
  • Auto alert with warning driving timely human interactions
  • Remote maintenance assistance by Techflow Team.

What are the major challenges in the filtration process and your system integration at cement plants?
The cement industry’s focus on sustainability, higher production and diverse fuel sources creates filtration hurdles. Adapting to changing dust properties, handling increased dust loads, and integrating seamlessly within space constraints are key challenges.
Techflow tackles these issues through advanced design techniques, exploration of innovative filter media, and modular system design. This ensures our filtration systems remain adaptable, efficient and seamlessly integrated within your cement plant, empowering your success.

How do you plan to further better your products and bring innovation in the future?
At Techflow, we are not just building filtration systems, we are shaping the future of clean air in the Indian cement industry. After successful expansion of the manufacturing facility in 2023, now it is time to improve designs and process optimisation. The future holds exciting possibilities: next-generation filter media with self-cleaning properties and
extended lifespans, minimising maintenance and maximising efficiency.
Techflow’s legendary after-sales support is about to get even better. We are expanding our global service network to provide you with 24/7 access to a team of India’s most experienced filtration specialists, ensuring your system operates flawlessly throughout its lifecycle.
Together, we will lead the way towards a sustainable future, paving the path for a greener tomorrow with green cement.

  • Kanika Mathur

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Economy & Market

Digitalisation is changing the logistics landscape

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Haresh Calcuttawala, CEO and Co-Founder, Trezix, explains how their platform streamlines export processes, optimises logistics operations, and addresses the challenges faced by the cement industry.

How does your platform help in the compliance of cement exports?
The Trezix platform helps with the end-to-end processes for exporters, ensuring complete visibility of these processes focusing on shipments, documents, compliances, etc. The platform is also integrated with various stakeholders’ part of the export process including integration with Unified Logistics Integration Platform (ULIP) by the Government of India.

What is the impact of your systems on the cost and productivity of a cement plant?
The Trezix platform helps to optimise the turnaround time, visibility of shipment and improving efficiencies, which results in optimisation in logistics cost and improvement in working capital.

What are the major challenges in logistics and how can that be resolved?
A major challenge in the cement industry is the logistics cost and time for delivery. This can only be resolved with faster turnaround time, complete visibility of shipments, delivery lead time and process control to adhere to compliance.

Tell us your views on the change technology is bringing to logistics.
In the cement industry, so far technology has been more focused on internal process, and optimising demand and supply in the area of supply chain. However, now the focus has completely shifted to external stakeholders and their processes, and how have we integrated processes to further optimise the logistics execution.

Can your systems and solutions be customised based on customer requirements?
Every customer has some unique value proposition for their customer segment. Trezix has flexibility by way of configuration to adhere to industry needs and specific customer needs, keeping in mind the regulatory processes are not deviated to fulfil statutory requirements.

How do you foresee the face of logistics changing for the cement industry?
Digitalisation is one of the biggest waves you can see in the logistics space, which is changing the face of the industry. Digitalisation is changing the logistics landscape. Various concepts like Just In Time (JIT) to customer delivery are now a reality. Vehicle utilisation, fuel efficiency, delivery visibility, vehicle tracking through RFID, Fastag, FOIS (rail receipt tracking), container/cargo tracking across geography is now a reality.

  • Kanika Mathur

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