Process and apparatus for controlling and metering the pneumatic transfer of solid particulates
First Claim
1. The method of controlling the flow of a fluidized particulate solid used in the processing of a hydrocarbon feedstock, which comprises:
- (a) passing a fluidized stream of said particulate solid downwardly from a pressurized source of said particulate solid in a first conduit to a junction with a second conduit where said solid particulate is mixed with a stream of a fluid transport medium from a third conduit;
(b) passing a stream of the resulting mixed solid/particulate transport medium upwardly in the second conduit from the first conduit for a distance at least as great as the diameter of the first conduit at said junction to a fourth conduit;
(c) transporting the particulate solid/fluid transport medium stream in the fourth conduit to a desired location;
(d) determining the temperature of the particulate solid in the first conduit;
(e) determining the temperature of the transport medium in the third conduit;
(f) determining the temperature of the solid particulate/transport medium mixture; and
(g) setting the flow rate of the transport medium in the third conduit to produce a target mass flow of the particulate solid in the fourth conduit determined in accordance with the following equation;
space="preserve" listing-type="equation">Mp=Mm·
Cm·
(T46-T40)/Cp·
(T36-T46)where;
Mp represents the target mass flow of the particulate solid in the fourth conduit,Mm represents the mass flow of the transport medium in the third conduit,Cp represents the heat capacity of the particulate solid,Cm represents the heat capacity of the transport medium,T46 represents the temperature of the particulate solid in the fourth conduit,T40 represents the temperature of the transport medium in the third conduit,T36 represents the temperature of the particulate solid in the first conduit.
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Accused Products
Abstract
The method of controlling the flow of a fluidizable particulate solid, e.g., FCC catalyst, which comprises: (a) passing a fluidized stream of the particulate solid downwardly from a source of the particulate solid, e.g., an FCC regenerator, in a first conduit to a junction with a second conduit where the solid particulate is mixed with a stream of a fluid transport medium from a third conduit; (b) passing a stream of the resulting mixed solid particulate/transport medium upwardly in the second conduit at an angle less than 90° from the first conduit for a distance at least as great as the diameter of the first conduit at the junction into a fourth conduit; (c) transporting the particulate solid/fluid transport medium stream in the fourth conduit to a desired location; and (d) controlling the mass flow of the particulate solid in the fourth conduit by setting the flow rate of the transport medium in the third conduit. By determining the temperatures of the particulate solid in the first conduit, the transport medium in the third conduit and the particulate solid transport medium mixture, the mass flow of the particulate solid in the fourth conduit may be controlled by setting the flow rate of the transport medium in the third conduit. Apparatus for carrying out the method is also included.
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Citations
21 Claims
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1. The method of controlling the flow of a fluidized particulate solid used in the processing of a hydrocarbon feedstock, which comprises:
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(a) passing a fluidized stream of said particulate solid downwardly from a pressurized source of said particulate solid in a first conduit to a junction with a second conduit where said solid particulate is mixed with a stream of a fluid transport medium from a third conduit; (b) passing a stream of the resulting mixed solid/particulate transport medium upwardly in the second conduit from the first conduit for a distance at least as great as the diameter of the first conduit at said junction to a fourth conduit; (c) transporting the particulate solid/fluid transport medium stream in the fourth conduit to a desired location; (d) determining the temperature of the particulate solid in the first conduit; (e) determining the temperature of the transport medium in the third conduit; (f) determining the temperature of the solid particulate/transport medium mixture; and (g) setting the flow rate of the transport medium in the third conduit to produce a target mass flow of the particulate solid in the fourth conduit determined in accordance with the following equation;
space="preserve" listing-type="equation">Mp=Mm·
Cm·
(T46-T40)/Cp·
(T36-T46)where; Mp represents the target mass flow of the particulate solid in the fourth conduit, Mm represents the mass flow of the transport medium in the third conduit, Cp represents the heat capacity of the particulate solid, Cm represents the heat capacity of the transport medium, T46 represents the temperature of the particulate solid in the fourth conduit, T40 represents the temperature of the transport medium in the third conduit, T36 represents the temperature of the particulate solid in the first conduit. - View Dependent Claims (2)
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3. The method of controlling the flow of a fluidized particulate solid used in the processing of a hydrocarbon feedstock, which comprises:
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(a) passing a fluidized stream of said particulate solid downwardly from a source of said particulate solid in a first conduit to a junction with a second conduit where said solid particulate is mixed with a stream of a fluid transport medium from a third conduit; (b) passing a stream of the resulting mixed solid particulate/transport medium upwardly in the second conduit at an angle less than 90°
from the first conduit for a distance at least as great as the diameter of the first conduit at said junction into a fourth conduit;(c) transporting the particulate solid/fluid transport medium stream in the fourth conduit to a desired location; and (d) controlling the mass flow of the particulate solid in said fourth conduit by setting the flow rate of said transport medium in said third conduit. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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10. Apparatus useful for controlling the flow of a fluidized particulate solid to be transported in a unit for the processing of a hydrocarbon feedstock, which apparatus comprises:
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(a) a downwardly extending first conduit having upper and lower ends, the upper end thereof being connectable to a source of said particulate solid; (b) a second conduit having upper and lower ends, the lower end thereof being connected to the lower end of said first conduit to place said first and second conduits in flow communication, said second conduit having a length extending upwardly from its junction with said first conduit for a distance at least as great as the diameter of the lower end of said first conduit; (c) a third conduit having first and second ends, said first end being connectable to a source of a fluid transport medium and said second end being connected to said junction to place said third conduit in flow communication with said first and second conduits; and (d) a fourth conduit having a first end and a second end and being in flow communication with said second conduit for receiving a stream of said particulate solid and said transport medium, the second end of said fourth conduit being connectable to a vessel for receiving the transported particulate solid. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification