Heat is power, waste is energy

A crucial aspect of sustainable waste management is generating energy from all kinds of waste heat to reduce energy consumption. At SMT’s plant in Perth, Scotland, within division Kanthal, a new Combined Heat and Power system will reduce the plant’s energy consumption substantially, providing one-third of the total power requirement.

The site in Perth is home to the company’s Globar® Silicon Carbide (SiC) heating elements. Making heating elements from this precious and complex material is an energy-intensive process, and this places an even greater impetus to make the operations as clean and efficient as possible.

Steven McCluskie, Manufacturing Manager at Kanthal in Perth, explains:

“The production of heating elements has a positive impact on industrial processes globally, reducing emissions by shifting those processes from gas to electric,” he says. “Since our manufacturing processes here at Kanthal Perth require a great deal of energy, we are driven to address both the direct and indirect emissions from our own operations.”

The recent installation of a 520-kW electric Combined Heat and Power (CHP) system, along with a seven-year energy supply agreement for discounted electricity via its CHP installer, is set to reduce its electricity costs and usage significantly.

“This is a very good example of how we are transforming our operations to support our long-term sustainability targets, both maximizing waste circularity and reducing CO2 emissions,” says Håkan Sundström, Head of Sustainability and Governance at Sandvik Materials Technology.

It is exciting, how new technology makes it possible to further reduce our CO2 emissions and at the same time develop leading solutions for our customers in sustainable industrial heating,” finishes Sundström.

Heat and power generaton in one system

“The CHP saves money because, as the name suggests, it combines heat and power generation in one system,” continues McCluskie, adding that the system is expected to reduce the plant’s energy costs by 12 percent annually based on current prices.

Internal departmental fan heater in Production Unit, Perth

The CHP unit, which is fueled by natural gas, will help to reduce costs by displacing other, more costly forms of polluting energy generation solutions, like coal and conventional gas turbines - both of which are currently part of the UK’s energy mix. Furthermore, the waste heat from this system can also be used to heat other parts of the business.

“The CHP will enable us to use the heat it generates specifically to heat our manufacturing areas and site hot water. This minimizes our reliance on various older, less efficient and less sustainable gas boilers, gas radiant- and space heaters around our site,” continues McCluskie. “By bringing down our electricity costs and usage the CHP also supports Kanthal’s sustainability goals.”

Heating the plant

So far, required pipework has been installed, along with a water-pumping system linked to a heat exchanger on the CHP unit. The heat is pumped around the factory shop floor via a series of strategically placed high-level-mounted fan units. In addition, the pipework is linked to the office central-heating system and shower blocks to further offset the use of aging gas boilers.

Going forward, the CHP is projected to generate around one-third of the total power, and more than 80% of the Perth facility’s total heating and hot water requirements, equivalent to greater than 3GWh per year.Steven McCluskie, Manufacturing Manager and Scott Lawson, Production Unit Manager, Kanthal

“Our customers look to us to support their energy transformation, but we also have a duty to ensure that our own processes are as sustainable as possible,” Scott Lawson, PU Manager in Perth comments. “We will not stop here. We have ambitions to further expand on-site generation of electricity, in whatever form that may take,” he adds.