| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1733885 | Energy | 2012 | 14 Pages |
The suitable size (electricity output capacity) of micro gas turbine cogeneration systems (MGT-CGSs) depending on scale of the sewage treatment plant was investigated. Since heat demand of the plant is affected by ambient temperature, performance under three typical ambient temperature conditions was investigated. Considering operation of the MGT-CGS under various loads and efficiency of the MGT-CGS under a partial load condition, the optimal combination of MGT-CGSs (MGT-Combination) with different sizes, 30 kW, 65 kW and 200 kW, was also proposed. An actual middle-scale plant was adopted as the analysis model, and it was scaled down to 0.50 and 0.25 in cases of smaller scale. Excluding MGT-Combination, it was found that the MGT that has approximately the same fuel energy input under full load as the biogas energy produced in the plant has the highest efficiency. However, in the case of heat demand of the plant varying throughout the year such as the operation in a cold region, partial load operation will be frequent and efficiency will decrease. Furthermore, MGT-Combination has the highest efficiency but its efficiency will be the same as that of the other MGT-CGSs when only comparatively constant operation is required throughout the year such as operation in a tropical region.
► A relation between scale of sewage treatment plants and biogas fuelled-micro gas turbine cogeneration systems (MGT-CGSs) was investigated. ► MGT-CGSs with electrical power output of 30 kW, 65 kW and 200 kW in three different scale sewage treatment plants were investigated. ► MGT-CGSs that have same fuel energy input under full-load as the biogas energy produced has the highest efficiency. ► However, in the case of heat demand of the plant varying throughout the year, its efficiency will decrease. ► The MGT-CGS that combined 30–200 kW MGTs has the highest efficiency.
