EVELINE - Up-to-date Waste-to-Energy Plant

EVELINE - Up-to-date Waste-to-Energy Plant

Due to the current objectives plan of waste management of the Czech Republic, which provides specific measures for waste treatment in the Czech Republic, we come up with a modern concept of up-to-date waste-to-energy plants with small and medium capacities (WtE Plant).

Our target is to deliver such units with annual capacities ranging from 10 up to 30 kt, which:

  • contribute to decentralization of heat and power generation
  • reduce transportation costs of municipal waste from producers,
  • offer a convenient alternative how to close the chain of producers and utilizators – effective waste-to-energy conception

 

Technical design of the small WtE Plant including steam production and subsequent power generation could be defined as follows:

  • Annual capacity is about 10 000 t/a. This quantity is approximately produced on the territory of 20,000 to 25,000 inhabitants. WtE Plant can be equipped with one up to three equivalent lines, thus annual capacity of 30 kt in total.
  • Natural gas used as a stabilizing and additional fuel.
  • The generated steam is used for power production in a simple turbine working in Rankine cycle.
  • Waste from a specific locality is deprived of non-incinerated particles, such as clay, stones, rubble, large pieces of metal, ash, etc.
  • Estimated calorific value of municipal waste ranges between 8 and 10 MJ/kg.
  • Working time is estimated to 8,000 hours/a.

The heart of the WtE Plant is a combustion chamber with reciprocating grate which allows incineration of municipal waste in wide range of composition. Ideal incineration process conditions are provided by controlled multi-stage injection of combustion air and by controlled speed of the grate. Flue gas temperature at the end of the combustion chamber, which is given by legislation, is maintained at 850°C, in  case of non-standard conditions, by stabilization burner firing natural gas. The size and arrangement of the combustion chamber after last injection of combustion air is designed to ensure residence time of flue gases for 2 s at 850 °C. The combustion chamber is in two pass arrangement. Flue gases then enter a steam boiler where steam is generated at given parameters.

Flue gas cleaning system of the WtE Plant primarily uses the dry method of flue gas cleaning, secondarily the wet scrubbing. Wet scrubber may not be used in certain cases. Cleaned flue gases leave the WtE Plant by a stack.

Main features of small and medium size WtE Plants:

  • significant contribution to energy self-sufficiency
  • waste treatment at place of its origin,
  • reliability, effective and relatively simple technology, which is designed to produce heat and power,
  • balanced technical and economic solution.
EVELINE - Up-to-date Waste-to-Energy Plant
EVELINE - Up-to-date Waste-to-Energy Plant
EVELINE - Up-to-date Waste-to-Energy Plant