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Show • For concept evaluation, a 3 MMBtu/hr watertube boiler located at Alzeta's research facility was used. This facility simulates the thermal environment of a larger industrial boiler, yet allows for quick and inexpensive tests to be conducted that would not be possible in larger test facilities. • The second facility was a 50,000 Ib/hr oil field steamer owned and operated by Chevron USA in Bakersfield, California. This piece of equipment was retrofitted with a Pyromat CSB30-4S0-30 burner in 1994, and was modified for fuel staging tests in 1995. The steamer had been modified in 1994 for simulated FGR tests with a high-C02 fuel. The following sections describe three test programs. In the first, staging and FGR were evaluated at laboratory scale. These tests were followed by a field demonstration of the staging concept. "Simulated" FGR tests were also completed at the field test site using a low Btu casing gas. The third set of tests, conducted in the Alzeta laboratory facility. were used to optimize the staged fuel concept. 3.1 CONCEPT DEVELOPMENT Facility Description A 3 MMBtu/hr watertube boiler was used for laboratory testing. The boiler has 257 fe of heating surface and is capable of providing 2570 Ib/hr of steam at 200 psig. The configuration is an '0' type with the steam drum directly above the mud drum. A 5-pass convective section sits above the radiant section. The internal dimensions of the radiant section are approximately 29 inches high by 39 inches wide by 48 inches deep .. This provides a space heat release rate of over 100.000 Btu/fe which is typical of the most compact watertube boilers on the market. A large viewing window on the rear wall of the boiler was added to view the burner when in operation and to record tests with a video camera. The boiler was equipped with thermocouples to measure stack temperature and boiler efficiency. Additional thermocouples and a suction pyrometer were used to measure gas phase temperatures in the radiant section. The facility was connected to Alzeta's emissions bench where real-time NOx• CO and stack O2 measurements were recorded. 6 |
