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HZI STM to supply boiler tech to Vantaan Energia

HZI STM to supply boiler tech to Vantaan Energia
The new high-temperature incineration plant will be built adjacent to the existing waste-to-energy (WtE) facility units (photo courtesy Vantaan Energia).

Hitachi Zosen Inova Steinmüller (HZI STM), a subsidiary of the Swiss-Japanese green-tech company Hitachi Zosen Inova AG, has announced that it has been selected to supply and install its rotary kiln boiler technology for a new high-temperature incineration plant treating hazardous waste in Finland.

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Vantaan Energia Oy, one of Finland’s largest municipality-owned energy companies recently announced that it has decided to invest in a new high-temperature incineration plant to treat non-recyclable business- and industrial hazardous waste.

The existing Vantaan Energia energy-from-waste (EfW) facility was originally built by Steinmüller Babcock Environment GmbH (SBE), then part of the Japan-headed Nippon Steel & Sumikin Engineering Co., Ltd, and since acquired by HZI.

This relationship now continues with the newly formed Hitachi Zosen Inova Steinmüller (HZI STM) also providing other services and products to the Vantaan Energia plant in Vantaa, a city in the north of Finland’s capital city Helsinki.

We are delighted to be supplying and installing our state-of-the-art rotary kiln boiler technology into Vantaan Energia’s facility, which will be an important element in our client’s and Finland’s decarbonization strategies. HZI and HZI Steinmüller are proud to have worked on the existing Vantaa EfW facility and now as a Hitachi Zosen Inova, we look forward to again working with Vantaan Energia on this next project, said Thomas Feilenreiter, Hitachi Zosen Inova’s VP of Systems & Service Solutions.

Toward 2030 carbon negativity

The design works have already started and HZI STM will begin to install the rotary kiln boiler in November 2023.

Commercial operations are expected in the summer of 2025, after a three-year engineering and construction phase. Once operational, the facility will provide between 12 MW and 24 MW of heat.

The high-temperature incineration plant treating non-recyclable hazardous waste continues Vantaan Energia’s investment program to phase out the use of fossil fuels in the company’s energy production as soon as possible and to continue towards carbon-negative energy production in 2030. Energy utilization of waste and carbon capture and processing into new products play a key role in our strategy, said Jukka Toivonen, CEO at Vantaan Energia.

Rotary kiln boiler technology

This EfW project will build on HZI STM’s experience in providing robust boiler technologies that will safely, securely, and reliably treat a mixture of non-recyclable hazardous waste materials while providing energy, and reducing Finland’s use of landfills.

The new infrastructure project gained the required building permit in the summer of 2022 and this was followed by the signing of a contract for engineering, procurement, and construction (EPC) on October 24, 2022.

The Vantaan Energia facility will not only treat around 40 000 tonnes of non-recyclable hazardous waste per year but will also generate sustainable steam which will be used by homes and industry via a local district heating network.

Hitachi Zosen Inova Steinmüller has a long history of installing its rotary kiln boiler technology and has previously instated these types of EfW facilities around the world – including the Clean Harbors El Dorado incineration facility in El Dorado, Arkansas (AR), United States (US).

Commissioned at the end of 2016, the US$120 million Clean Harbors El Dorado commercial hazardous waste incinerator in El Dorado can handle industrial and laboratory chemicals, manufacturing by-products, medical waste, and other solid and liquid materials. The HZI STM proprietary rotary kiln (foreground) and secondary combustion chamber (photo courtesy Clean Harbors).

According to HZI STM, a key advantage of rotary kiln technology is that several hazardous waste streams can be processed simultaneously, for example, solid waste, waste oil, polluted sludges, and polluted liquids.

These non-recyclable waste materials can be treated in a single treatment unit.

A secondary combustion chamber is installed directly after the rotary kiln to ensure that toxic substances in the flue gas are safely destroyed at a temperature of at least 1 100°C.

This temperature is considerably higher than in conventional domestic waste EfW facilities. The secondary combustion chamber is located at the end of the rotary kiln.

The flue gas from the secondary combustion chamber is fed into a steam boiler in which process steam is generated at approximately 212°C. This steam will be used for heating purposes or optional industrial processes.

The plant’s modern flue gas cleaning system downstream of the boiler ensures that the latest and demanding European emission limits are always safely met.

For Vantaan Energia, the high safety level of the technology and design solutions used, the implementation of the investment projects according to stringent targets, and the high degree of availability of the plants are extremely important. Cooperation with HZI STM has been excellent in the soon-to-be-completed project on the Waste-To-Energy Plant. We are extremely happy that HZI STM will continue as our important partner also in the high-temperature incineration plant project, ended Jukka Toivonen.

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