Patent ID: 7935226
Filing Date: 2011-05-03
Classification: B08B,C10B

Abstract:
1. A method to remove coke from a coker drum comprising: a) impinging a fluid from fluid jet on a layer of coke on the inside surface of a section of said coker drum, b) determining a vibration signal for a time period on a wall of the coke drum, c) determining amplitude versus frequency by a Fourier Transform of the vibration signal, d) repeating steps a) to c), until the vibration signal indicates that the layer of coke is removed from the section of the coker drum, e) impinging the fluid jet into a new layer of coke when the amplitude versus frequency of step d) indicates that a layer of coke has been removed and then repeating steps a) through d) until all of the coke has been removed from the coker drum.