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Prudinec landfill degassing system

One gas engin with generator whit the capacity of:mE Jakuševec 2 (GP4) consinst of:Prudinec Landfill degassing system consists of:

1.    
GN - gas network - landfill body degassing system consists of:

  • 128 gas wells with control regulator valves
  • Approximately 8,0 km of gas pipelines with vapour traps, condensate collection manholes and pits
  • Five temporary degassing gas lines at the work surface where waste is deposited daily

2.     Gas plant mTEO consists of:

  •        Three high-temperature flares with compressors with the capacity of 1,700 m3 of gas per hour
  •        Three gas engines with generators with the capacity of 525 m3 gas per hour per engine
  •        Three generators with a total power of 3 MW 

2.  mE Jakuševec 2 (GP4) consinst of:
  •      one gas engin with generator whit the capacity of: 555 m3 gas per hour
  •      one generator with a total power of: 1.2 MW


Degassing system:

Perforated pipes are sonded into the layers of waste deposited at individual finished surfaces to collect the gas generated by the decomposition of the organic waste component. The gas is then extracted using compressors and conveyed to the biogas collecting station using an underground gas pipe system.
Five temporary degassing lines, which are used to actively degas the surface during construction (surface area 6/1 and 6/2), have also been added to the active degassing system. Since December 2014 until December 2019, 7,07 million m3 of landfill gas was extracted. This gas was then used in the production of electricity from renewable energy sources.

The landfill gas collecting station continually analyses and controls the chemical composition and the quality of the landfill gas. Compressors are used to compress the extracted gas and convey it to the consumers, mainly to the gas engines-generators for the generation of electricity, which is fed into HEPs system. The remaining amount is thermally processed, i.e. incinerated at high-temperature flares.

 

mTEO - Gas facility (GP1, GP2, GP3):

  • From December 2014 to December 2019 the gas facility has produced 134.429 MWh of electricity; 147.15 thousand.m3 of landfill gas has been extracted from the landfill, Tablica 1.

  • In 2014, 12.003.668 kWh of electricity was generated by two gas engine-generators, which is enough to cover the average annual electricity consumption of around 4.000 households.
  • A third gas engine-generator was added to the existing two on February 13, 2015. Since then, the three gas engine-generators have produced 17.524.144 kWh of electricity, which is enough to cover the average annual electricity consumption of around 5.500 households.
  • This success was then picked up again in 2016, when 19.006.584kWh of electricity was produced from renewable energy sources using all three gas engine-generators. This amount of electricity, which is enough to cover the average annual electricity consumption of around 6.300 households, was fed into the system of the Croatian Electric Company (Cro. “HEP”).
  • During 2017, 13.609.660 kWh of electricity was produced from renewable energy sources and fed into HEP's system. This decrease in production in comparison to 2016 was caused by engine halts and major overhauls done on two of the gas engine-generators (including a raise in E60 overhaul intervals to 24.000 work hours). The produced electricity is enough to cover the average annual electricity consumption of around 4.500 households.
  • In 2018, 18.297.660kWh of electricity was produced from renewable energy sources and fed into HEP's system, which is enough to cover the average annual electricity consumption of around 6.100 households.
  • From January to December 2019, the gas facility has produced 19.091 MWh of electricity from renewable energy sources, which was fed into HEP's system and is enough to cover the yearly average electricity consumption of around 6.360 households, (mTEO).




mEJakuševec 2 – gas facility (GP4)

Due to the increase of the amount of landfill gas to 1.800-2.000 m3/h which is to be collected and thermally processed, the mTEO gas facility was expanded with the addition of another gas engine-generator named mEJakuševec 2 (GP4). The power to produce electricity and thermal energy and/or thermally process landfill gas in the  high-temperature flares (B1, B2, B3) was therefore increased by another 1,2 MWel. The mEJakuševec also holds its own transformer (T4), voltage unit (SN) and an upgraded system for thermal energy exploitation.
Landfill gas cleaning system:
- modernised the facility which has been running for the past 15 years; it consists of a dehumidifying unit/condensate isolation unit and a unit which uses active coal to clean gas and eliminate silicon compounds and silicate
- has been on a „trial run“ since December 2018
Combustion gas cleaning and ventilation system:
- modernised the facility and all gas engine-generators with the aim to eliminate dust particulates in the air used in the combustion process and the ventilation system thereby expanding the running hours and reducing costs and the scope of gas engine-generator maintenance
- will be placed on a „trial run“ at the end of May 2019



On May 25, 2019, an internal technical investigation was conducted upon which mE Jakuševec 2 – GP4 was placed on a trial run to produce electricity. On September 17, 2019, HEP granted it permission to become a „full fledged member“ of the gas facility.

From May 28, 2019 to December 2019, 4.512 MWh of electricity was sourced from this renewable energy source and fed into HEP's network. The amount of electricity produced is enough to supply around 2.580 households with electricity in the amount they would consume during a 7 month period, (GP4).


Last modified: 11/02/2020