MIXING TIME, CIRCULATION TIME AND LIQUID CIRCULATION VELOCITY IN A MODIFIED AIRLIFT LOOP REACTOR WITH DOUBLE DRAFT TUBES

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BEHIN J.; Kompany R.

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Seminar Paper

Paper Information

Seminar: CHEMICAL ENGINEERING CONGRESS AND EXHIBITION
Year:2008 | Issue:5

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Title

MIXING TIME, CIRCULATION TIME AND LIQUID CIRCULATION VELOCITY IN A MODIFIED AIRLIFT LOOP REACTOR WITH DOUBLE DRAFT TUBES

Author(s)

BEHIN J. | Kompany R.

Keywords

MODIFIED AIRLIFT LOOP REACTOR

DOUBLE DRAFT TUBES

MIXING TIME

CIRCULATION TIME

LIQUID CIRCULATION VELOCITY

Abstract

THE LIQUID MIXING TIME, CIRCULATION TIME, AND CIRCULATION VELOCITY IN THE RISER AND TWO DOWN COMERS OF A MODIFIED AIRLIFT LOOP REACTOR WITH DOUBLE DRAFT TUBES WERE INVESTIGATED. THE MIXING PARAMETERS FOUND WITH USING TRACER TECHNIQUE IN A COLUMN OF 18.5CM IN DIAMETER, 90CM IN HEIGHT, AND TWO CONCENTRIC DRAFT TUBES OF 14 AND 8.5CM IN DIAMETER AND 82CM IN HEIGHT RESPECTIVELY. THE TRACER INJECTION METHOD AND IMPULSE RESPONSE WAS USED TO FIND THE MIXING PARAMETERS. THE MIXING TIMES DECREASED WITH SUPERFICIAL GAS VELOCITY, WITH A POWER CORRELATION. THE EXPONENT VALUES WERE -0.194, -0.197 AND -0.164 FOR RISER, INNER AND OUTER DOWN COMERS RESPECTIVELY, WHICH SHOWS THE LOWER VALUES OF MIXING TIME FOR DOUBLE DRAFT-TUBE CONFIGURATION COMPARED TO CONVENTIONAL ALR. THE MIXING PARAMETERS AND CIRCULATION VELOCITY ARE COMPARED FOR DIFFERENT PART OF THE COLUMN. FOR ALL INJECTIONS POINTS, THE SIMILAR RESULTS WERE ACHIEVED IN ALL SECTIONS. AN ASCENDING TREND OF CIRCULATION VELOCITY WITH THE INCREASE OF SUPERFICIAL GAS VELOCITY WAS SEEN. THE CIRCULATION VELOCITY IN RISER, INNER AND OUTER DOWN COMERS VARIED WITH AN EXPONENT OF 0.235, 0.145, AND 0.177 WITH SUPERFICIAL GAS VELOCITY RESPECTIVELY. THE LIQUID CIRCULATION VELOCITY IN THE OUTER DOWNCOMER SHOWED HIGHER VALUES, BECAUSE OF HIGHER WALL EFFECTS AND LOSSES, THAN THE INNER ONE.

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APA: Copy

BEHIN, J., & Kompany, R.. (2008). MIXING TIME, CIRCULATION TIME AND LIQUID CIRCULATION VELOCITY IN A MODIFIED AIRLIFT LOOP REACTOR WITH DOUBLE DRAFT TUBES. INTERNATIONAL CHEMICAL ENGINEERING CONGRESS AND EXHIBITION. SID. https://sid.ir/paper/908653/en

Vancouver: Copy

BEHIN J., Kompany R.. MIXING TIME, CIRCULATION TIME AND LIQUID CIRCULATION VELOCITY IN A MODIFIED AIRLIFT LOOP REACTOR WITH DOUBLE DRAFT TUBES. 2008. Available from: https://sid.ir/paper/908653/en

IEEE: Copy

J. BEHIN, and R. Kompany, “MIXING TIME, CIRCULATION TIME AND LIQUID CIRCULATION VELOCITY IN A MODIFIED AIRLIFT LOOP REACTOR WITH DOUBLE DRAFT TUBES,” presented at the INTERNATIONAL CHEMICAL ENGINEERING CONGRESS AND EXHIBITION. 2008, [Online]. Available: https://sid.ir/paper/908653/en

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