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CHAPTER 6 Capstone FUEL REQUIREMENTS

CHAPTER 6: FUEL REQUIREMENTS

Capstone 1000 MicroTurbine systems are available in several versions that can operate on natural gas, and medium BTU gasses (such as from a landfill or anaerobic digester). Capstone has defined these fuel types according to energy content, Wobbe index, and other characteristics in the Fuel Requirements Specification (410002). Table 6-1 summarizes the energy content and inlet fuel pressure requirements for each C1000 package fuel version.

Table 6-1. Fuel Input Requirements

Fuel Type

Inlet Pressure Range

Fuel Type

Fuel Energy Content Range [HHV]

High Pressure NG

75-80psig (517 – 552 kPaG)

Natural Gas

30,700 – 47,500 kJ/m3 (825 – 1,275 Btu/scf)

Low Pressure NG

0.25 – 15 psig (1.8 – 103 kPaG)

Landfill

75 – 80 psig (517 – 552 kPaG)

Landfill Gas

13,000 – 22,300 kJ/m3 (350 – 600 Btu/scf)

Digester

75 – 80 psig (517 – 552 kPaG)

Digester Gas

20,500 – 32,600 kJ/m3 (550 – 875 Btu/scf)

The fuel provided to each C1000 package must meet the inlet pressure requirements under all operating conditions. Fuel flow during on-loads can be up to twice the nominal steady state value. Nominal steady state fuel flow [HHV] at full power and ISO conditions for each 200 kW power module is 2,400,000 kJ/hr (2,280,000 Btu/hr). The ratio of higher heating value (HHV) to lower heating value (LHV) is assumed to be 1.1 for all fuel types.

Maximum fuel contaminants are defined in the Fuel Requirements Specification (410002) for each fuel type. Some of the allowable contaminants depend on the specific MicroTurbine model rather than the fuel type definition. For the 200 kW power modules, the maximum allowable sulfur content (expressed as hydrogen sulfide) is shown in Table 6-2.

Table 6-2. Maximum Sulfur Content

Fuel Type

Maximum Sulfur Content (expressed as H2S)

High Pressure NG

5 ppm

Low Pressure NG

Landfill

5,000 ppm

Digester

5,000 ppm

410072 Rev A (January 2009)

Page 6-1

Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.

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