Displaying items by tag: Research
Green hydrogen for grey cement
08 July 2020Hydrogen and its use in cement production has been adding a dash of colour to the industry news in recent weeks. Last week, Lafarge Zementwerke, OMV, Verbund and Borealis signed a memorandum of understanding (MOU) to plan and build a full-scale unit at a cement plant in Austria to capture CO2 and process it with hydrogen into synthetic fuels, plastics or other chemicals. This week, Air Products and ThyssenKrupp Uhde Chlorine Engineers (TUCE) signed a strategic agreement to work together in ‘key regions’ to develop projects supplying green hydrogen. Both of these developments follow the awarding of UK government funding in February 2020 to support a pilot project into studying a mix of hydrogen and biomass fuels at Hanson Cement’s Ribblesdale integrated plant.
As the title of this column suggests there is an environmental colour code to describe how hydrogen is made for industrial use. This is a bit more codified than when grey cement gets called ‘green’ but it pays to remember what the energy source is. So-called ‘green’ hydrogen is produced by the electrolysis of water using renewable energy sources such as hydroelectric or solar, ‘Grey’ hydrogen is made from steam reforming using fossil fuels and ‘Blue’ hydrogen is similar to grey but has the CO2 emissions from the fuels captured and stored/utilised. Price is seen as the main obstacle to wider uptake of hydrogen usage as a fuel in industry although this is changing as CO2 pricing mounts in some jurisdictions and the connected supply chain is developed. A study by BloombergNEF from March 2020 forecasted that green hydrogen prices could become cheaper than natural gas by 2050 in Brazil, China, India, Germany and Scandinavia but it conceded that many barriers would have to be overcome to get there. For example, hydrogen has to be manufactured making it more expensive than fossil fuels without government policy support and its, “lower energy density also makes it more expensive to handle.”
The three recent examples with respect to the cement industry are interesting because they are all exploring different directions. The Lafarge partnership in Austria wants to use hydrogen to aid the utilisation side of its carbon capture at a cement plant. The industrial suppliers, meanwhile, are positioning themselves in the equipment space for the technology required to use hydrogen on industrial plants. Secondly, ThyssenKrupp has alkaline water electrolysis technology that it says it has used at over 600 projects and electrochemical plants worldwide. Air Products works with industrial gas production, storage and handling.
Finally, the Hanson project in the UK will actually look at using hydrogen as a partial replacement for natural gas in the kiln combustion system. A Cembureau position paper in mid-2019 identified that the challenges to explore in using hydrogen in cement production included seeing how its use might affect the physical aspects of the kiln system, the fuel mass flows, temperature profile, heat transfer and the safety considerations for the plant. Later that year a feasibility study by the Mineral Products Association (MPA), Verein Deutscher Zementwerke (VDZ) and Cinar for the UK government department that is funding the Hanson project concluded that a hydrogen flame’s high heat in a burner alone might not make it suitable for clinker formation. However, the study did think that it could be used with biomass to address some of that alternative fuel’s “calorific limitations” at high levels. Hence the demonstration of a mixture of both hydrogen and biomass.
That’s all on hydrogen but, finally, if you didn’t log into yesterday’s Virtual Global CemProducer 2 Conference you missed a treat. One highlight was consultant John Kline’s presentation on using drones to inspect refractory in some hard to reach places. Flying a camera straight into a (cool) pyro-processing line was reminiscent of a science fiction film! Global Cement has encountered the deployment of unmanned aerial vehicles in quarry and stockpile surveys previously but this was a step beyond.
UK: Germany-based Loesche has joined a network of expert companies that “share relevant information and results regarding the reduction of environmental impact and the use of coal and enhanced energy security globally” in becoming an IEA Clean Coal Centre knowledge partner. The company said, “We are excited to be part of this renowned group of companies that aim to improve the environmental impact by use of green technologies, renewable resources, and alternative use of energy sources for more sustainable engineering projects.”
UK: The Global Cement and Concrete Research Network (Innovandi) has launched a week of online workshops dedicated to lowering cement and concrete’s carbon footprint through research and development, with the participation of 30 companies and 40 scientific institutions.
Global Cement and Concrete Association cement director Claude Loréa said, “Cement is fundamentally important to our world today and will play a crucial role in building the sustainable world of tomorrow. It is therefore critical to support and accelerate the breakthrough processes and products that will improve sustainability and decrease carbon emissions. The Innovandi Kick-off Week offers a platform for leaders from across the world of cement and concrete to collaborate with academic institutions and define the cutting-edge research that will address these challenges and help us create a better future.”
Odisha road built from industrial waste materials
18 June 2020India: Odisha has received its first cement-free road near Amanapada, Cuttack District. The Pioneer newspaper has reported that researchers from the Kalinga Institute of Industrial Technology (KIIT) developed the new material, made from 100% industrial waste, in order to cut the CO2 emissions involved in cement production and in anticipation of an acute limestone shortage in India in 25 – 50 years. KIIT founder Achyuta Samanta thanked the students whose work brought this pilot project to fruition. “The new technology has the potential to bring about a revolution in engineering construction,” he said.
Germany: Lubricants specialist Fuchs has announced its collaboration with chemicals company BASF in performing a cradle-to-grave analysis of different mineral oil hydraulic fluids that takes into account all environmental and economic aspects of their lifecycle. The study concluded that high performance multigrade hydraulic oil (HVLP) has a lower environmental impact and lower overall cost than monograde hydraulic oil (HLP). Fuchs said, “This advantage is mainly based on an improved diesel fuel economy throughout the use phase - primarily due to improved volumetric fluid efficiency, lower friction and lower fluid mass circulation ratio.”
Fuchs and BASF both supply lubricants and chemical products to the cement industry.
Germany: HeidelbergCement’s profit was Euro1.24bn in 2019, down by 3.4% from Euro1.23bn in 2018. Its revenue grew by 4.3% to Euro18.9bn from Euro18.1bn. HeidelbergCement says that it reduced its specific net CO2 emissions by 1.5% year-on-year to 590kg/t from 599kg/t in 2018 and ‘intensified its research and development (R&D) efforts on carbon capture and utilisation/storage (CCU/S)’ in every operating region globally.
The group announced a year-on-year increase in volumes in the first two months of 2020, with all but three of its plants (HeidelbergCement subsidiary Italcementi’s 2.8Mt/yr Calusco plant, 2.5Mt/yr Rezzato plant and 0.6Mt/yr Tavernola plant in Lombardy region, Italy) still operating through the coronavirus pandemic, though it noted that construction is slowing in the US, Australia and Western Europe due to the outbreak.
HeidelbergCement cancelled its 7 May 2020 annual general meeting (AGM) ‘due to the spread of the coronavirus.’
Mexico: Cemex Ventures has partnered with BCG and Tracxn to launch a list of 2019’s global 50 ‘most promising’ construction start-ups. Assessment categories were technical innovation, project management and sustainability. Companies like the UK’s Cloud Cycle, a concrete management platform provider, and the US’s Concrete Sensors, which provides remote concrete strength, temperature and relative humility measurement solutions, typify the promising developments in how the construction industry uses its cement.
Solar-powered cement production
20 November 2019Microsoft co-founder Bill Gates entered the world of cement this week with a public relations blitz for Heliogen. He’s one of the backers of a new Californian technology startup looking to use concentrated solar power (CSP) to power heavy industrial processes like clinker or steel production. The company says it has concentrated solar energy commercially to levels above 1000°C.
Its process, called HelioMax, uses a closed-loop control system to improve the accuracy of a heliostat system. It says it achieves this by using computer vision software to better align an array of mirrors to reflect sunlight towards a single target. Temperatures of up to 1500°C is one of its targets so that it can apply itself to a variety of processes in the cement, steel, mining, petrochemical and waste treatment industries. It says it can do this for US$4.5/MCF. Another target once it hits 1500°C is to start manufacturing hydrogen or synthetic gas fuels.
Heliogen’s press release was picked up by the international press, including Global Cement, but it didn’t mention the similar work that SOLPART (Solar-Heated Reactors for Industrials Production of Reactive Particulates) project is doing in France. This project, backed by European Union Horizon 2020 funding, is developing a pilot scale high temperature (950°C) 24hr/day solar process for energy intensive non-metallic minerals’ industries like cement and lime. It’s using a 50kW solar reactor to test a fluidised bed system at the PROMES (PROcédés, Materials and Solar Energy) testing site in Odeillo, France.
Heliogen’s claim that it can beat 1000°C is significant here but it doesn’t go far enough. Clinker production requires temperatures of up to around 1450°C in the sintering phase to form the clumps of clinker. SOLPART has been only testing the calcination stage of clinker production that suits the temperature range it can achieve. Unless Heliogen can use its method to beat 1450°C then it looks likely that it will, similarly, only be able to cut fossil fuel usage in the calcination stage. If either Heliogen or SOLPART manage to do even this at the industrial scale and it is cost effective then the gains would be considerable. As well as cutting CO2 emissions from fossil fuel usage in cement production this would reduce NOx and SOx emissions. It would also cut the fuel bill.
As usual this comes with some caveats. Firstly, it doesn’t touch process emissions from cement production. Decomposing limestone to make calcium oxide releases CO2 all by itself with no fuel. About one third of cement production CO2 emissions arise from fossil fuel usage but the remaining two thirds comes from the process emissions. However, one gain from cutting the amount of fossil fuels used is a more concentrated stream of CO2 in the flue gas. This can potentially reduce the cost of CO2 capture and utilisation. Secondly, concentrated solar power systems are at the mercy of the weather, particularly cloud cover. To cope with this SOLPART has been testing a storage system for hot materials to allow the process to work in a 24-hour industrial production setting.
Looking more broadly, plenty of cement producers have been building and using solar power to supply electricity. Mostly, these are photovoltaic (PV) plants but HeidelbergCement built a CSP plant in Morocco. Notably, PPC Zimbabwe said this week that it was building a solar plant to supply energy to two of its cement plants. It is doing this in order to provide a more reliable source of electricity than the local grid. India’s Birla Corporation has also said that it is buying a solar energy company today. The next step here is to try and run a cement plant kiln using electricity. This is exactly what Cementa, HeidelbergCement’s subsidiary in Sweden, and Vattenfall have been exploring as part of their CemZero project. The pilot study demonstrated that it was technically possible but only competitive compared with ‘other alternatives in order to achieve radical reductions in emissions.’
None of the above presents short or medium-term reasons for the cement industry to switch to solar power in bulk but it clearly deserves more research and, critically, funding. One particular strand to pull out here about using non-fossil fuel powered clinker production systems is that it produces purer process CO2 emissions. Mounting carbon taxes could gradually force cement plants to capture their CO2 but once the various technologies above become sufficiently mature they could bring this about sooner and potentially at a lower cost. In the meantime the more billionaires who take an interest in cement production the better.
Global Cement and Concrete Association launches research network
10 October 2019UK: The Global Cement and Concrete Association (GCCA) has launched ‘Innovandi,’ a research network between industry and scientific institutions. The network intends to research the areas of process technology, including the impact of co-processing, efficiency of clinker production and implementation of CCUS/ technologies, and products. This will include the impact of clinker substitutes and alternative binders in concrete, low carbon concrete technology and improve the understanding of CO2 reduction through re-carbonation.
“Our industry is fully committed to taking action to reduce CO2 emissions. As such, Innovandi is an industry led initiative and will bring together the best minds from all corners of the cement and concrete world, academia and business. Together we will truly collaborate on a global scale and use our expertise to find new ways of working and developing effective innovations,” said Benjamin Sporton, the chief executive officer (CEO) of the GCCA.
24 companies from the cement and concrete industry, including cement and concrete manufacturers, admixture specialists and equipment suppliers, have committed to the initiative, with scientific institutions and additional companies set to join as its work begins work. These include Buzzi Unicem, Cementir Holding, Cementos Argos, Cementos Molins, Cementos Pacasmayo, Cemento Progresso, Cemex, CNBM, Chryso, CRH, Dalmia Cement, FLSmidth, Grupo Cementos de Chihuahua (GCC), GCP Applied Technologies, Mapei, HeidelbergCement, LafargeHolcim, Nesher Israel Enterprises, SCG Cement, Titan Cement, Refratechnik Cement, Sika Technology, Subote New Materials and Votorantim.
As part of the new initiative, the GCCA also intends to establish an annual Innovandi global conference to promote collaboration on innovation and research in the sector.
Massachusetts Institute of Technology research team investigate electrochemical process to make clinker
01 October 2019US: A team of researchers at the Massachusetts Institute of Technology (MIT) have demonstrated an electrochemical process to make clinker in a laboratory. A paper on the work by Yet-Ming Chiang, the Kyocera Professor of Materials Science and Engineering at MIT, with postdoctoral researcher Leah Ellis, graduate student Andres Badel and others has been published in the Proceedings of the National Academy of Sciences of the United States of America (PNAS).
In the new process, pulverised limestone is dissolved in acid at one electrode in an electrolyser and carbon dioxide (CO2) is released in a pure, concentrated stream. Lime is precipitated out as a solid at the other electrode. The lime can then be processed in another step to produce clinker.
Benefits of the new process include potentially substituting fossil fuels with electricity supplied from renewable sources and the production of a pure source of CO2 that could be captured with less or no scrubbing compared to conventional clinker production.