Displaying items by tag: Synhelion
Storing energy at scale at cement plants
27 September 2023Taiwan Cement has just commissioned a 107MWh energy storage project at its Yingde plant in Guangdong province, China. Subsidiary NHOA Energy worked on the installation and has been promoting it this week. The battery storage works in conjunction with a 42MW waste heat recovery (WHR) unit, a 8MWp solar photovoltaic unit and a proprietary energy management system. It is expected to store about 46,000MWh/yr of electricity and save just under US$3m/yr in electricity costs.
NHOA Energy, formerly known as Engie EPS before Taiwan Cement bought a majority stake in it, claims it is one of the largest industrial microgrids in the world. We can’t verify this for sure, but it is definitely large. For comparison, the 750MW Vistra Moss Landing Energy Storage Facility in California often gets cited as the largest such facility in the world. This is run by a power company, as are many other large battery energy storage systems. In its annual report for 2022 Taiwan Cement said it was planning to using NHOA’s technology to build seven other large-scale energy storage projects at sites in Taiwan including its integrated Suao, Ho-Ping and Hualien cement plants.
The aim here appears to be supplying renewable electricity to the national grid in Taiwan. Taiwan Cement is diversifying away from cement production, with an aim to derive over 50% of its revenues from other activities besides cement by 2025. In 2022 cement and concrete represented 68% of its sales, while its electricity and energy division, including power supply and rechargeable lithium-ion batteries, represented 29%. The company is also not using its own batteries at the Yingde plant. Instead it is using lithium iron phosphate batteries supplied by Ningde Times. This is worth noting, as the cement producer’s batteries are used in vehicles.
Global Cement regularly reports news stories on cement plants that are building photovoltaic solar power arrays. However, so far at least, energy storage projects at scale have been rarer. One earlier example of an energy storage system loosely associated with a cement plant includes the now decommissioned Tehachapi Energy Storage Project that was situated next to the Tehachapi cement plant in California. That project tested using lithium ion batteries to improve grid performance and integrate intermittent generation from nearby wind farms. It is also worth noting that Sumitomo Osaka Cement’s sister company Sumitomo Electric is one of the world’s larger manufacturers of flow batteries, although no installation at a cement plant appears to have happened yet. In simple terms, flow batteries are an alternative to lithium ion batteries that don’t store as much energy but last longer.
More recently, Lucky Cement in Pakistan started commercial operation of a 34MW solar power plant with a 5.59MWh energy storage unit at its Pezu plant in Khyber Pakhtunkhwa in late 2022. Reon Energy provided the equipment including a lithium-ion based battery approach to the storage. Then, in March 2023, Holcim US said that it was working with TotalEnergies to build solar power capacity and a battery energy storage unit at the Florence cement plant in Colorado. TotalEnergies will install, maintain and operate a 33MW DC ground-mounted solar array and a 38.5MWh battery energy storage system at the site. Operation of the renewable energy system is expected to start in 2025.
Away from electrical batteries, the other approach to energy storage at cement plants that has received attention recently from several quite different companies has been thermal batteries. The two prominent groups using them at different scales are Rondo Energy and Synhelion. The former company has developed its Heat Battery technology, which uses refractory bricks to absorb intermittent renewable energy and then supply the energy back as a steady stream of hot gas for use in a cement plant mill, dryer, calciner or kiln. Both Siam Cement Group (SCG) and Titan Cement have invested in Rondo Energy. In July 2023 SCG and Rondo Energy said that they were planning to expand the production capacity of a heat battery storage unit at a SCG plant to 90GWh/yr. Synhelion, meanwhile, has been working with Cemex on using concentrated solar power to manufacture clinker. It achieved this on an ‘industrially viable scale’ in August 2023. It has since been reported that the companies are working on building a small scale industrial plant at Móstoles near Madrid by 2026. Crucially for this discussion though, the process also uses a thermal energy storage unit filled with ceramic refractory material to allow thermal energy to be released at night, and thus ensure continuous operation.
The examples above demonstrate that some cement companies are actively testing out storing energy at scale. Whilst this will not solve the cement sector’s process emissions, it does potentially start to make using renewable energy sources more reliable and reduce the variable costs of renewable power. Whether it catches on remains to be seen. Most of these kinds of projects have been run by power companies and that is where it may stay. It is instructive to note that Reon Energy was the only company to state that its battery-based energy storage system has a life-span of 8 - 12 years. Our current vision of a net-zero future points to high electrical usage but it may be shaped by how good the batteries are… from our phones to our cars to our cement plants.
For more information on Rondo Energy read the January 2023 issue of Global Cement Magazine
Spain: Switzerland-based Synhelion and Cemex España plan to build a new clinker plant near Madrid. The plant will use Synhelion’s synthetic fuel to produce clinker from clay and crushed sand at 1200°C. The fuel consists of a gas produced from green hydrogen and captured CO2, using solar heat. La Tribune de Genève Online News has reported that Synhelion’s thermochemical reactor further helps to capture CO2 emissions from clinker production. A study by the Swiss Federal Institute of Technology Lausanne indicated that this can halve the cost of carbon capture at cement plants, to below Euro85/t.
Mexico/Switzerland: Cemex and industrial solar heat specialist Synhelion have achieved constant clinker production on an industrially viable scale using only solar heat. The partners say that this confirms the technology's potential for industrial-scale implementation.
Cemex chief executive officer Fernando A González said “I am convinced we are getting closer to the technologies that will enable net-zero CO2 cement and concrete production. The solid progress I see here proves that solar cement is not just a dream: it is achievable through continued collaboration, and backed up by rigorous research and testing.”
DOE provides funding to Solar MEAD project
17 February 2023US: The US Department of Energy (DOE) has awarded US$3.2m to Solar MEAD, a project that aims to replace fossil fuels with concentrated solar thermal (CST) energy in clinker production. Solar MEAD is jointly led by Cemex, Swiss solar fuels innovator Synhelion and Sandia National Laboratories, a research and development laboratory run by the DOE.
Synhelion’s CST technology generates hot gas at 1500°C, high enough to produce clinker without any thermal fuels. Cemex and Synhelion produced a batch of clinker with CST in a research setting in Spain in 2022. In the Solar MEAD project, Sandia National Laboratories will contribute its research facilities in New Mexico and subject expertise to help accelerate the adaptation of the technology for use in cement manufacturing. The projects aims are to increase the efficiency of CST technology by improving heat transfer from the hot gas to the cement raw mix and further reduce the CO2 emissions of the process.
Cemex Ventures enlarges investment in Synhelion
16 December 2022Switzerland: Cemex's innovation investments subsidiary Cemex Ventures has made a further investment in solar-powered clinker production system developer Synhelion. Synhelion's technology enables cement plants to entirely replace fuels in their cement production with concentrated solar heat. Cemex Ventures said that its investment reflects the importance of sustainable fuel alternatives for Cemex's 2050 net zero CO2 emissions strategy.
Other investors include oil company Eni, engineering company SMS Group and airline Swiss.
Update on electric cement kilns
15 June 2022Coolbrook has been in the news recently with collaboration deals struck with Cemex and UltraTech Cement. First the Finland-based company officially launched its Roto Dynamic Heater (RDH) technology with a memorandum of understanding signed with Cemex in May 2022. Then, this week, it signed a similar agreement with UltraTech Cement.
The specifics of either agreement are unknown but the target is clearly to build an industrial pilot of an electric kiln – or something like it - at a cement plant. Coolbrook says it has run a pilot of its RDH technology in Finland. Further tests are now scheduled to continue for two years starting from September 2022 at the Brightlands Chemelot Campus at Geleen in the Netherlands. Commercial scale demonstrations are scheduled from 2022 with the hope of commercial use from 2024. Links with Cemex and UltraTech Cement seem to suggest progress. At the same time Coolbrook will be testing its RotoDynamic Reactor (RDR) technology, which promises to electrify the steam cracking process used in plastic manufacturing.
Publically available details on the RDH technology are light. In its promotional material Coolbrook says that it can achieve process temperatures of up to around 1700°C. This is crucial to achieve full clinker formation in a cement kiln. Reaching this temperature with non-combustion style kilns, such as solar reactors, has previously been a problem. Notably, Synhelion and Cemex said in February 2022 that they had managed to produce clinker using concentrated solar radiation. Retrofit possibilities and compact equipment size are also mentioned in the promotional material for the RDH. The former is an obvious attraction but size of equipment footprint is increasingly emerging as a potential issue for cement plants looking to reduce their CO2 emissions. Rick Bohan from the Portland Cement Association (PCA) presented a summary of the potential and problems of emerging carbon capture and utilisation/storage (CCUS) technologies for cement plants in the US at the Virtual Global CemCCUS Seminar that took place on 14 June 2022. He noted that installing CCUS equipment makes cement plants start to look different (more like petrochemical plants in the view of Global Cement Weekly) and that they may require more space to install it all.
Coolbrook hasn’t been the only organisation looking at kiln electrification. The installation with the most available information on kiln electrification has been the Decarbonate project, led by the VTT, formerly known as the Technical Research Centre of Finland. The project has built a pilot rotary kiln with a length of 8m inside a shipping container. It has a production capacity of around 25kg/hr. The system reportedly uses fixed radiant heating coils around the kiln, surrounded by insulation materials. Early results presented to the 1st Virtual Global CemPower Seminar in late 2021 were that the kiln started up, sufficient calcination was occurring and the system was operated continuously for three days at a temperature of 1000°C with no problems reported. Further research was scheduled to carry on into 2022 with longer trials planned for three different materials.
HeidelbergCement’s subsidiary in Sweden, Cementa, completed a feasibility study on implementing electrified cement production at its Slite plant in 2019. It then said that it was conducting further study with electricity producer Vattenfall as part of CemZero project. This consists of three projects running to 2025. Namely: heat transfer with plasma in rotary kilns; direct separation of carbon dioxide from calcination of carbonate-based raw materials in the production of cement clinker and burnt lime; and carbon dioxide-free products with electrified production - reactivity of cement clinker with secondary additives. HeidelbergCement has since announced plans to build a full scale 1.8Mt/yr carbon capture and storage (CCS) plant at the Slite cement plant by 2030.
How this would fit with any kiln electrification plans is unknown. However, one attraction of moving to an electrical kiln, for all of the projects above, is to cut out the 40 – 50% of a cement plant’s CO2 emissions that arise from the fuel that is burnt. Taking a kiln electric also makes CO2 capture easier. Much of the remainder of the CO2 released comes from the decomposition of limestone during calcination when clinker is created. Substitute out fossil or alternative fuels and the flue gas becomes much purer CO2.
It is early days for cement kiln electrification but progress is happening both commercially and scientifically. The next step to watch out for will be the first pilot installation at a cement plant. One point to finish with is a comment that Rick Bohan made at the IEEE-IAS/PCA Cement Industry Technical Conference that took place in May 2022: carbon capture is expected to double a cement plant’s energy consumption. Kiln electrification is one potential route for cement production to reach net zero. CCUS is another. If one or both occur then a low carbon future could be a high energy one also.
Watch out for Global Cement’s forthcoming interview with Coolbrook in the September 2022 issue of Global Cement Magazine
For more on CCUS, download the proceedings pack for the Virtual Global CemCCUS Seminar 2022
Update on Spain, February 2022
09 February 2022The data on cement consumption for 2021 in Spain is out this week and it looks promising. As the national cement association Oficemen explained, last year was the sector’s best for over a decade, nearly reaching 15Mt consumption and exceeding the figure in 2019 before the Covid-19 pandemic started. Oficemen also singled out particular strong performance in December 2021. It now expects this growth trend to continue into 2022 with a forecast of 5% to 15.6Mt predicted based on both domestic and infrastructure segments.
Graph 1: Cement consumption in Spain, 2012 – 2021. Source: Oficemen.
The Spanish cement industry reached a peak consumption of over 50Mt in the late 2000s before hitting a near-50 year low in the 2010s in the wake of the 2008 financial crisis. The market then started to recover in the second half of the 2010s until Covid-19 came along. A report on the Spanish cement market to the start of 2021 that lays out the situation can be found in the February 2021 issue of Global Cement Magazine. The larger news stories since then have been Votorantim Cimentos’ growth in the market through its acquisitions of FYM and Cementos Balboa, and Çimsa Çimento’s final completion of its deal to buy the Buñol white cement plant from Cemex. Each of these stories involve an integrated cement plant changing ownership.
Looking back at Oficemen’s summary describing 2012 depicts a much different dwindling market. However, one commonality it shares with the association’s roundup for 2021 is that it complains about the country’s disadvantage in electricity costs compared to its neighbours. Back in 2012 this was framed as holding back exports. As Oficemen noted at the time it exported 5.9Mt of cement in 2012, less than half the 13Mt it exported in 1983. Jump forward to 2021 and exports are now 6.8Mt. Energy is still a key issue though. Now Oficemen’s president, José Manuel Cascajero Rodríguez, says that the sector’s production costs have increased by 25% since the latest round of electricity price rises began. He then compares the cost of energy intensive industry in Spain unfavourably against France and Germany and calls for a structural change in the Spanish electricity market to make prices more predictable. Cement producers elsewhere in Europe and beyond may share Oficemen’s concerns regard unpredictable energy prices over the last six months but electricity has been a particular issue for Spain for a long time. To take one recent local example, in November 2021 Cementos Cosmos said it was planning to scale down the production of clinker at its Córdoba cement plant as a result of the high cost of electricity.
The other issue that gets raised in Oficemen’s 2021 summary is competition from cement importers outside the European Union (EU) and the necessity of a border carbon adjustment mechanism (CBAM) to take in account carbon taxation for producers within Europe. To jump back a bit, back in May 2021 the EU Emissions trading Scheme (ETS) reached Euro50/t. Then in December 2021 Cembureau, the European cement association, published a calculation predicting that if the EU ETS CO2 cost made it to Euro90/t then this could represent 12 - 15% of the production costs of cement producers. Well, as readers will have guessed, the EU ETS beat Euro90/t on 2 February 2022 and then rose to Euro96.7/t on 7 February 2022. Answers in an email for when readers think the EU ETS price will top Euro100/t.
All of the above feeds neatly into the week’s other big Spanish news story: Cemex and Synhelion have successfully produced clinker from concentrated solar radiation at a pilot unit at the Very High Concentration Solar Tower of IMDEA Energy near Madrid. It’s early days yet as the process needs to be scaled up but, make no mistake, this is a big story. An interview with the team behind Cemex and Synhelion’s solar concentration project can be found in the December 2020 issue of Global Cement Magazine for more information. The SOLPART (Solar-Heated Reactors for Industrials Production of Reactive Particulates) project in France did similar research a few years ago but it didn’t reach the 1500°C target required to reach the sintering phase where clumps of clinker form. US-based Heliogen has been trying to industrialise concentrated solar energy but not much has been heard about its cement-industry ambitions since it said it reached temperatures of about 1000°C in 2019.
The relevance of an eventual full-scale concentrated solar unit for the entire production line or just the preheater and/or calciner at a cement plant in Spain makes considerable sense. At a stroke energy costs are reduced, diverted to a renewable source and any desired CO2 capture becomes, in theory, easier and cheaper. Cemex said in the interview with Global Cement Magazine that the tentative next step would be a pilot unit at a cement plant, although, candidate plants could be in the US or Mexico, as well as Spain. Another side of the drive to cut energy and carbon costs can also be seen in a couple of photovoltaic solar projects supplying cement plants that were announced in 2021 for Spanish plants run by Cemex and Cementos Cosmos.
We leave the Spanish cement sector in a growth phase but with plenty of challenges ahead, not least from electricity costs and the mounting cost of carbon. Yet in common with other countries in Europe the industry faces a high-wire balancing act between staying economically viable and inching towards net zero. It’s conceivable that an industrial scale concentrated solar unit at a cement plant in Spain by 2030 might steady the wobbles along the way.
Mexico: Cemex has announced the signing of a collaboration agreement with Switzerland-based alternative fuel (AF) specialist Synhelion, through which the pair aim to develop the use of solar power as an alternative heat source to fuel in clinker production. Pilot testing of Synhelion products will begin at a Cemex plant in late 2022, at a total investment cost of up to US$10m.
Head of global research and development Davide Zampini said, "Thanks to the technology that Synhelion is developing, we can bring the solar heat up to 1500°C. In the process, we can also capture the carbon dioxide (CO2), and that fits perfectly into the process of the synthetic fuel."