Biomass gasification for combined heat and power production

Jim AnderssonEnergy Engineering

Division of Energy ScienceLuleå University of Technology

HighBio seminar 2011 Kokkola, Finland

Highbio

Main objectives

Modeling of CHP plant in Aspen Plus, for establishing heat and mass balance

Evaluate the production cost of electricity (COE) and cost of heat (COH) for CHP plant up to 10 MWel

Sensitivity analysis of different factor affecting the production costs, e.g. investigate during which conditions it is profitable.

Gas turbine performanceGas turbine Siemens

TB5000-

Case 1

SiemensTornado

-Case 2

Nuovo Pignone PGT10

-Case 3

MWel

(Natural gas) 3.9 6.7 11.3

MWel

(Syngas) 2.7 4.7 8.3

Heat and mass balance

29 MWth

3.3 MWel

11.2 MWth

Electrical efficiency 11%Thermal efficiency 38%Electrical/Thermal output 0.29Total efficiency 49%

3.7 MWel

2.3 MWth0.8 MWel

Economic evaluation• A municipality has a heat

demand of x-MW and a investment in a heat producing facility necessary

• The additional investment will account for the COE

• COE – Cost of electricityCOH – Cost of heat

Economic results

Case 1 Case 2 Case 3

Total investment(Meuro) 12.0 16.4 22.8

COE (Euro/MWh) 241 173 147

COH(Euro/MWh)

50 50 50

Based on 6000 operating hours per year

Case III – Fixed COH

Case III

Conclusions

Net plant output is 0.9 to 3.3 MWel

COE in the range 147-241 €/MWh, resulting COH 50 €/MWhOperating hours, capital cost and biomass price

affect the COE most, along with plant efficiency Possible to increase the total efficiency, e.g.

reduce the production cost