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AssigneeInstitut Francais du Petrole
InventorsFran.cedilla.ois Heslot, Claude Beauducel
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In a pipe containing a fluid wherein particles circulate, at least one detector is attached. The detector includes a cavity in fluid communication with the pipe by a vent whose section, at least at an opening for fluid communication with a pipe is of the same dimensions as that of the circulating particles. A periodic exciter such as a source of acoustical waves or a generator of the periodic motion piston type suitable for inducing alternate pressure variations in the fluid in the cavity is coupled with the cavity. The excitation frequency can be selected in keeping with a resonance frequency of the cavity. Signals representative of the pressure variations of the excited fluid, resulting from flowing of the particles past the opening of each vent are measured. Processing of the signals allows the velocity of the particles to be determined. Other parameters of the particles can be determined by means of two distinct detectors coupled with the pipe. The detector may be used for monitoring the flow of catalytic particles in continuous reforming plants, for example.
A process for monitoring a flow of particles or pellets with dimensions in a certain range, circulating in a pipe containing a fluid, comprising:
A process for monitoring a flow of particles or pellets with dimensions in a certain range, circulating in a pipe containing a fluid, comprising:
A device for monitoring a flow of particles or pellets with dimensions in a certain range, circulating in a pipe containing fluid, which comprises at least one detector comprising a cavity opening in and acoustically coupled with the pipe through a vent whose section, at least at an opening for fluid communication with the pipe, is of a same order of magnitude as the dimensions of said particles, and an excitation means with a certain electroacoustic impedance which is coupled with the cavity for generating periodic pressure variations in the fluid inside the cavity, means for measuring signals indicative of pressure variations of the fluid in the cavity resulting from variations of the acoustic coupling of the cavity with the pipe when particles flow in the pipe past the opening of the vent, and processing means for determining therefrom at least one parameter indicative of the flow of particles.
A device for monitoring a flow of particles or pellets with dimensions in a certain range, circulating in a pipe containing a fluid which comprises at least two detectors each comprising a cavity opening in and acoustically coupled with the pipe through a vent whose section, at least at an opening for fluid communication with the pipe, is of a same order of magnitude as the dimensions of said particles, and the at least two detectors communicating with the pipe at different points along the pipe, excitation means with a certain electroacoustic impedance which is coupled with said cavities for generating periodic pressure variations in the fluid inside the cavities, means for measuring signals indicative of pressure variations of the fluid in the cavities resulting from variations of the acoustic coupling of the cavities with the pipe when particles flow in the pipe past the opening of the vent, and processing means for determining therefrom at least two parameters indicative of the flow of particles.
Dependencies are inferred from the claim text.