13

N.D:Not Detected N/M:Not Measured

*1: Hydrogen Sulfide is reduced previously at the digester tank inlet.

N.D:Not Detected N/M:Not Measured

*1: Hydrogen Sulfide is reduced previously at the digester tank inlet.

(2)PHASE-3

Table-3 presents the data from the parametric tests and the estimated value at 200kW electrical output on 60% methane. In this test plant, the maximum load on 60% methane was 137 kW due to the increased pressure drop in the ADG piping which was the ADG inlet piping of FCPP and the piping between FCPP and the ADG pretreatment unit.

The parasite power of the ADG pretreatment unit was 7 kWh, consumed by the compressor. It is noted that the CO concentration at LTS outlet gas has a tendency to increase as methane concentration becomes low, due to the conversion a part of CO, into CO in the reformer. It is estimated that the optimum S/C would be 3.5 with 200 kW on 60% methane.

For the maximum load , it is confirmed that the standard PC25 B would be able to achieve 200kW electrical output on 75% methane. However, due to an increase in the amount of volume flow, maximum load on 60% methane would be 160 kW.

From the above results, it is confirmed that an ADG fueled FCPP can be designed by modifying the standard FCPP on natural gas without any special technology developments which require the system and component design, verification testing etc.

Experimental Condition S/C3.0 Ref. outlet

Temp:1292F LTS outlet Temp392F

O CO conversion Amethan conversion • CO(%) at LTS outlet ■ CO(%) at Ref. outlet AC02(%) at Ref. outlet

Experimental Condition S/C3.0 Ref. outlet

Temp:1292F LTS outlet Temp392F

O CO conversion Amethan conversion • CO(%) at LTS outlet ■ CO(%) at Ref. outlet AC02(%) at Ref. outlet

50 60 70 80 90 100 Methane concentration in fuel Gas(%)

Figure 3. FPS test results in Phase-1

The modifications necessary to achieve 200kW electrical output on 60% methane are as follows:

(1) Increase the size of ADG feed gas flow piping.

(2) Increase the capacity of the valves on this pipingline.

(3) Define the ejector specification to reduce the parasite power for the ADG pretreatment unit.

Table-3 Parametric test results

Methane Concentration^)

90%

75%

60%

Electrical Output(kW)

200kW

150 kW

137 kW

200kW(Estimate)

Electrical Efficiency (LHV%)

0 0

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