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Biomass Cogeneration System - Combined heat and power plants with waste wood (wood biomass)

VADO offers solutions and manufacturing of equipment for burning down of waste woods and biomass.

We offer complex integrated plants that can burn down practically every biogenic fuel and secondary wood products for generation of electrical and thermal power with this fuel as well as separate components of these plants.

The offered CHP plants will be manufactured as module version. As processing medium the classical water vapor or steam of silicon oil can be used (ORC process). The electricity will be produced through the steam process. Waste heat may be exploited at temperatures ranging from 40°C up to 150°C. The thermal output released in consequence of this process makes up from 3000 kW up to 28 000 kW. Plants with electrical performances of up to 3,000 kWel are equipped with two steam generators; plants delivering up to 7,000 kWel are equipped with four steam generators.

Technical Data 

Wood fuel value

Turbo generators

The electricity will be generated in the thermodynamic continuous process, which water or organic silicon oil circulates in closed circuit in. In both cases it is referred to closed steam circuit what various processing medium are used for. The differences depending on type of construction are indicated on the diagram below:

Steam turbines process description (steam power plant)

In the steam process water vaporizes under pressure in the boiler and then overheats. Steam is going to the turbine which the thermal power will be transformed into mechanical power in. The alternator connected to the turbine generates electrical power. The exhaust steam extracted from the turbine will be supplied to the condenser, which residual energy, normally servicing for the heat, will be feed to the heat carrier in. During heat transfer steam will be condensed into water again, that will be going to the steam boiler and the process begins from the start.

ORC circuit process description

In the ORC process the processing medium will be replaced by silicon oil. Biomass (waste wood) will be burn in the thermal oil boiler. Then the generated heat will be feed through economizer to the oil circuit (thermal oil), that vaporizes the organic processing fluid in the thermal oil vaporizer. The vaporized processing fluid turns the turbine connected to the alternator. Then the vaporized fluid goes through regenerator heating processing fluid that will be feed to the vaporizer. Further this fluid condenses in the water condenser. The condensate will be pump into vaporizer and the thermodynamic circuit closes.

Energy distribution

The electricity generation depends on heat extraction. When the rated power of the heat generator makes up 100% then the provided power is equal to approx. 18% and the heat power approx. 82%. With this ration the water temperature is 90°С. The lower is the water temperature the more electricity will be provided and accordingly less heat. These data can be calculated on base of the diagram below and formulas. It is to be taking into account that the auxiliary power makes up 15% to 20%. The data below are indicated as valuation assumption.

Wood biomass as fuel: sawdust, chips, rind and other wood waste from wood conversion (furniture manufactures, paper making, lumbering etc.)

This kind of fuel has fuel value (Hu) depending on humidity:

Wood

Fuel value (Hu) per kg (ash content approx. 3%)

Humidity, %

0

10

20

30

40

50

60

Broadleaf wood

4,84

4,30

3,74

3,19

2,64

2,09

1,53

Firwood

5,12

4,54

3,96

3,38

2,80

2,22

1,64

Average value

4,98

4,42

3,85

3,29

2,72

2,15

1,59

Consumption according to the diagram

55%

62%

71%

83%

100%

127%

171%

The scope of supply consists of:

  • Fuel feeding unit, incl. hydraulic system
  • Firebox
  • Inlet air system, incl. air preheater
  • Ash removing unit
  • Steam boiler with economizer, condensate preheater
  • Exhaust gas system with exhaust pipe (option)
  • Piping system, incl. water treatment
  • Turbo generator with steam engine and alternator
  • Control system incl. electrical engineering

Advantages:

Using of waste woods as fuel at wood conversion manufactures enables following:

  • organize selling of excess heat and/or electricity;
  • reduce or exclude purchasing of heat and/or power energy or energy ressources;
  • recovery waste, reduce costs for its transportation and dump maintenance;
  • secure the energy consumption reliability, provide energy supply independence taking into account practically zero-costs for waste;
  • enhance local economic development.
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