Structural design of a probe system for a high-temperature pressurized fluidized-bed combustor

Abstract

A lack of information about the operating characteristics of a jetting pressurized fluidized-bed combustor (PFBC) can be attributed to the environment (1227 K and 2.93 MPa) in the bed. To gain information about a PFBC's operation, a pressure and temperature probe has been designed to measure the small pressure fluctuations and bulk fluid temperature in the feed jet area. This research concentrates on the structural design and analysis of a multi-tier dual-static-pressure and temperature probe system. Each tier contains two branches placed one above the other in the axial direction; they are arranged to measure the differential pressure and temperature at a given radial and axial location in the feed jet. Each branch is a structural tube member, of 6.35 mm outside diameter, with a smaller tube, of 1.07 mm inside diameter, placed inside for the pressure measurement. A thermocouple is placed on the upper branch of each tier for the temperature measurement. Inconel 600 alloy is selected for the structural and pressure measurement tubing and thermocouple sheathing material because of cost, availability and manufacturing concerns. This paper presents the results of the structural design of the probe system to be fitted in the bed.

Keywords

computer-aided design analysis flow measurement modelling pressure measurement vibration

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References

Atkinson

C. M.

Clark

N. N.

The analysis of fluidized bed behavior using probes. In Proceedings of the Conference on Powder and Bulk Solids, Rosemont, Illinois, 13–15 May 1986, pp. 437–443 (Powder Advisory Centre, London).

Rowe

P. N.

Masson

Interaction of bubbles with probes in gas fluidised beds. Trans. Instn Chem. Engrs, 1981, 59 (3), 177–185.

Oki

Akehata

Shirai

A method for evaluating the size of moving particles with a fiber optic probe. Powder Technol., 1975, 11, 51–57.

Oki

Walawender

Fan

L. T.

The measurement of local velocity of solid particles. Powder Technol., 1977, 18, 171–178.

Ishida

Tanaka

An optical probe to detect both bubbles and suspended particles in a three-phase fluidized bed. J. Chem. Engng Japan, 1982, 15 (5), 389–391.

Sitnai

Utilization of the pressure differential records from gas fluidized beds with internals for bubble parameters determination. Chem. Engng Sci., 1982, 37, 1059–1066.

Geldart

Xie

H. Y.

The use of pressure probes in fluidized beds of group A powders. In Fluidization VII, Proceedings of the Seventh Engineering Foundation Conference on Fluidization, 1992, pp. 749–756 (Engineering Foundation, New York).

Flemmer

R. L. C.

A pneumatic probe to detect gas bubbles in fluidized beds. 1. Method of operation. Ind. Engng Chemistry Fundamentals, 1984, 23, 113–115.

Flemmer

R. L. C.

Swart

H. C.

Mori

A pneumatic probe to detect gas bubbles in fluidized beds. 2. Response of the probe. Ind. Engng Chemistry Fundamentals, 1984, 23, 116–119.

10.

Werther

Bubbles in gas fluidised beds. Part 1. Trans. Instn. Chem. Engrs1974, 52, 149–159.

11.

Clark

N. N.

Karamavruc

A. I.

Effect of transducer diaphragm movement on pressure probe measurements. Chem. Engng Sci., 1997, 52 (8), 1301–1306.

12.

Smith

Karamavruc

A. I.

Clark

Thompson

Hydrodynamic analysis of a jetting fluid gasifier. Phase I final report (revised) DE-AP21-95MC05122, Morgantown Energy Technology Center, Morgantown, West Virginia, 1995.

13.

Inconel Alloy 600, 7th edition, 1987 (Inco Alloys International, Huntington, West Virginia).

14.

I-DEAS Master Series, 1996 (Structural Dynamics Research Corporation, Milford, Ohio).

15.

Haji-Sulaiman

Lim

C. J.

Watkinson

A. P.

Gas composition and temperature profiles in a spouted bed coal gasifier. Can. J. Chem. Engng, 1986, 64, 125–132.