REFERENCES

BIOMASS WASTE HEAT RECOVERY BOILER FOR HEAT SUPPLY OF THE PRODUCTION OF POLYETHYLENE TEREPHTHALATE (PET) BOTTLES

 

Use of CO2 neutral biomass rather than fossil fuels to ensure the heat supply
for the PET production

 

Heat source: Flue gases from biomass combustion

With over 308 thousand tons per year of polyethylene terephthalate (PET) granules is NEO Group one of the biggest producers in Europe. For the location in Lithuania closed to port Klaipeda Maxxtec supplied the thermal oil system to ensure the heat supply for the production with biomass as energy source. Since the beginning of 2015 green energy is being produced from biomass.

The annual production of over 308 000 tons PET corresponds to about 12 % of the total European production. For this process, heat of 2 x 12 megawatts (MW) from biomass is generated at temperatures of more than 310 °C with the two 65 tons waste heat recovery systems. Two economizer and two air preheater ensure the efficient usage of biomass.

The operating principle of a Maxxtec heat transfer system is based on the combination of a 2-pass-heater with economizer uses thermal oil as heat transfer fluid to move the heat from hot flue gases to the production process.

Customer is Axis Technologies a part of the Axis Industries group, which designs and implements projects in the fields of biofuel energy, boiler-house and power-station, electricity and automation, carries out construction and modernization works in the Baltic States and other foreign countries.

“We are pleased to apply this eco-friendly alternative to the former natural gas combustion jointly with Axis”, so Hermann Hauck, technical project manager of Maxxtec GmbH. “With our technology, the PET producer NEO Group will use CO2-neutral biomass as energy sources and thereby we also contribute to reducing local carbon dioxide emissions”.

Heat use: Thermal oil waste heat boiler with exhaust gas heat exchanger as economizer
Fuel: Biomass
Thermal output: 2 x 12 megawatt (MW) power
Exhaust-gas temperature: approx. 950 °C (before heater) -> approx. 320 °C (after heat exchanger)
Heating capacity per year: approx. 96.000.000 kWh/a operated by 8.000 hours/year under full load
CO2 - reduction: 19.200 tons per year (biomass is CO2 neutral, calculated on natural gas to 0,2 kg CO2/kWh)
Cost saving: 4.800.000 € per year (calculated assuming a price difference of 0,05 €/kWh between biomass and natural gas without CO2 rate)

 

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