About the plant

• The total power capacity of the WtE unit is up to 20 MWe, and the total heat capacity is up to 70 MWt. The WtE unit can produce up to 160 GWh of power and up to 524 GWh of heat.
• The total power capacity of the biomass unit is up to 80 MWe, and the total heat capacity is up to 175 MWt. The biomass unit can produce up to 405 GWh of power and up to 1,274 GWh of heat.

Combustion type

• WtE unit has a boiler with a combustion grate.
• Biomass unit has circulation fluidized boilers (CFB).

WtE unit:

• Selective non-catalytic reduction system
• Spray dry absorbers
• Sleeve filtration system

Biomass unit:

• Selective non-catalytic reduction system
• Spray dry absorbers
• Sleeve filtration system

WtE unit:

• Continuous monitoring of nitrogen oxides, carbon monoxide, sulphur dioxide, particulates, total organic carbon, hydrogen chloride and hydrogen fluoride, ammonia, oxygen and water vapour.
• Spot measuring of heavy metals, dioxins and furans (PCDDs/Fs) as well as polychlorinated biphenyls (PCBs).

Biomass unit:

• Spot measuring of nitrogen oxides, carbon monoxide, sulphur dioxide, particulates, oxygen and water vapour concentration.

We are also carrying out periodic monitoring of industrial and municipal wastewater, surface water, groundwater and fly ash.

For the waste installation:

• Constantly – concentrations of nitric oxides, carbon monoxide, carbon dioxide, sulfur dioxide, particulate matter, total organic carbon, hydrogen chloride and hydrogen fluoride, ammonia, oxygen, water vapour, and etc.
  
• Periodically – heavy metals, dioxins and furans, arsenic, and etc.

For biofuel installations:

• concentrations of nitric oxides, carbon monoxide, carbon dioxide, sulfur dioxide, particulate matter, ammonia, oxygen, and water vapour.

Vilnius CHP has dual utility as it has two separate cogeneration units. One is a WtE unit, where the waste remaining after sorting and mechanical and biological treatment is turned to energy. The other is a biomass unit.

The WtE unit has receiving, weighing, preparing, storing and feeding systems. The 70 MW boiler also has a travelling grate as well as a fly ash, bottom ash and flue gas treatment product collection and storing system. The unit also has a flue gas treatment system, a condensing economizer, a flue gas monitoring system and a steam turbine with a 20 MW generator.

The biomass unit has receiving, weighing, mixing, storing and feeding systems. Next to the plant there is a biomass storage lot with rail tracks, which can store around 30 thousand tonnes of biomass.

The biomass unit has two circulation fluidized boilers that are the same in terms of their parameters and construction, up to 95 MW each. The unit also contains a steam turbine with an 80 MW generator. It also has a fly ash, bottom ash and flue gas treatment product collection and storing system, two identical flue gas treatment systems, two identical condensing economizers, and the stack of each boiler has two separate flue gas monitoring systems.

The total power capacity of the plant is up to 100 MW, and heat capacity is around 240 MW. Vilnius CHP was designed while taking into the account the capital’s heating demand and the situation in the waste and biomass markets. It can cover around a third of the heat demand during the coldest periods and around 40% of the annual heat energy needs of Vilnius.

Vilnius CHP generates heat, which is supplied to the Vilnius district heating network, and electricity, which is supplied to the 110 kV electricity network operated by a transmission system operator, LITGRID.

The biomass supply is diversified through road and rail deliveries. To manage the supply flows and to ensure a reserve, we have installed an additional biomass unloading and storage lot. The plant can amass a biomass reserve, which would last for up to 4 weeks.

The incoming vehicles are automatically weighed and assigned an unloading hole, biomass is then unloaded, and samples are collected. After the vehicles are weighed, they are assigned an unloading hole. There are 8 unloading holes with conveyor belts that transport biomass for sampling, removing metal, shredding larger chunks and storing in it 3 silos, which ensure a biomass reserve for 3 full days.

Each silo can hold ~8000 m³, or 2560 tonnes, of biomass and combined they can hold 24000 m³, or 7680 tonnes, in total. When silos are full, the conveyor belts transport biomass to the biomass boiler with two smaller silos/interim storage facilities for biomass boilers No 1 and No 2 each. The capacity of each smaller interim storage facility is 200 m³. When the smaller silos are full, conveyor belts transport the biomass using 4 feeders to a boiler furnace for combustion and energy production.

The plant has a fuel lab to assess the quality of the biomass. Biomass samples, which were taken automatically, are analysed for moisture content, ash content and calorific value.