Industry News Producing biogas from waste and sludge W

ELTEC Biopower to Present Solutions for Climate-Neutral Energy Generation

at IFAT At this year’s IFAT, the world’s

leading trade fair for environmental technologies, will now be held in Munich, Germany, from 7 - 11 September, biogas plant manufacturer WELTEC BIOPOWER will again present its anaerobic digestion plants for industrial and municipal use. In Hall A4, at Booth 508, the internationally renowned biogas specialists will provide information on all topics concerning the use of organic waste and sludge for the production of energy. The reference projects for

the digestion of waste and the production of biomethane, which is equivalent to natural gas, include the WELTEC plant of the French potato chips manufacturer Altho, whose chips brand Bret’s accounts for one third of the French market. Every year, the plant in St. Gérand, Brittany, produces about 1.75 million standard m³ of biomethane from 22,000 t of production waste in the form of potatoes and starch as well as

sludge from the internal wastewater treatment plant. This amount of the climate-neutral energy source corresponds to the gas consumption of a town of 5,000 inhabitants. Altho benefits greatly from the biomethane production, which enables it to use its leftovers in a sustainable manner and cut greenhouse emissions. The annual savings amount to approximately 3,900 t of CO2eq. This corresponds to the emissions that more than 2,000 persons would cause with a flight

from Munich to New York. For the energy plant, WELTEC has

implemented process technology that is both innovative and reliable: The mix of solid and liquid substances is first pre-processed and homogenised in order to ensure efficient digestion in the stainless- steel digester. The entire process is fully automated and controlled by a PLC unit. With the help of the membrane processing, the biogas is then transformed into biomethane. “Custom-tuned biogas technology

is a must”, says Jens Albartus, Director of WELTEC BIOPOWER. “Usually, anaerobic digestion plants will only encounter technical problems if the process technology does not meet the requirement profile.” For this reason, plant operators and investors should opt for a provider who has experience with various substrates and climate conditions. In its projects, WELTEC custom-tailors its plants so as to ensure stable, economic operation. In more than 300 planned and implemented biogas projects in 25 countries, the specialists have gained a wealth of experience with diverse framework conditions. Regardless of whether sludge,

abattoir waste or production leftovers are used as raw material, WELTEC thus guarantees a high energy yield. This is achieved with the right blend of expertise, smart processes and custom-tailored supervision by biologists and engineers. IFAT visitors will be able to get further information on the efficient conversion of organic waste to high-energy biogas and biomethane at the booth of WELTEC Biopower (Hall A4, Booth 508).

Valmet to supply a flue gas condensing plant to Helen’s Vuosaari bioenergy heating plant in Helsinki

Valmet will supply a flue gas condensing plant to Helen Ltd’s Vuosaari C bioenergy heating plant in Helsinki, Finland. The new bioenergy heating

plant will feature very high energy efficiency, as the heat from flue gases will be recovered to increase district heat production by 69 megawatts (MW) with Valmet’s advanced environmental technology. The order is included in Valmet’s

orders received of the first quarter 2020. The value of these types of orders is approximately between EUR 20–30 million. The flue gas condensing plant will be handed over to Helen in December, 2022. “Our company’s target is to be carbon neutral by 2035. As the flue

gases after combustion are led to the condensing plant, it is possible to utilize the fuel to its fullest. The heat recovery at the Vuosaari plant will increase plant efficiency to about 122 percent based on the fuel’s effective heating value,” says Antti Saikkonen, Project Director, Helen Ltd. “The exceptionally high heat

recovery is achieved by using absorption heat pumps to cool down the scrubber water and by cooling the flue gas going into the stack to below 12 Celsius. The absorption heat pumps use low-pressure steam as the driving media instead of electricity,” says Risto Hämäläinen, Director, Environmental Systems, Pulp and Energy, Valmet. Valmet’s delivery consists of

a flue gas condensing plant and condensate treatment equipment, including a boiler make-up water production system. Flue gas from the bioenergy

heating plant’s circulating fluidized bed (CFB) boiler is recovered by condensing flue gas moisture in a wet scrubber. Flue gas moisture is increased by moisturizing the combustion air going into the boiler. Heat recovery increases district heat production by an additional 69 MW, which is over 30% of the fuel heat input based on the effective heating value. Flue gas condensate from the

process is treated and utilized as raw water at the boiler plant and as boiler make-up water after demineralizing.

Information about the customer Helen Ltd Helen Ltd. is one of the largest energy companies in Finland with more than 500,000 customers. The company produces and sells electricity, district heating and district cooling. Furthermore, it offers solutions for

regional and renewable energy, smart housing and electric mobility. Helen’s target is to achieve 100%

carbon neutrality in its energy production in 2035.

VALMET Corporate Communications For further information: Risto Hämäläinen, Director, Environmental Systems, Pulp and Energy, Valmet Tel. +358 40 505 2001

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