FR2652891A2 - Method and device for regulation or control of the level of heat of a pulverulent solid, including a heat exchanger with fluidised or mobile bed compartments - Google Patents

Abstract

The main patent application describes a method and a device for thermal regulation of fluidised or mobile beds of pulverulent solids, the device including a fluidised or mobile bed heat exchanger. According to the invention, a pulverulent solid is made to flow essentially from the base of an enclosure in the heat exchanger, including an internal separating partition which defines two elongate adjacent compartments which communicate through their lower part. In the peripheral compartment where the pulverulent solid flows downwards, the fluidisation pressure is less than the fluidisation pressure prevailing in the central compartment where the pulverulent solid rises through the heat exchanger.

Description

The main patent relates to a process for thermal regulation and / or flow rate of a pulverulent solid with heat exchange in a fluidized bed and a device for implementing this process. More particularly, the process can be applied to the regeneration of catalysts which are particularly charged with hydrocarbon residues and with coke after reaction with a hydrocarbon charge. It can relate to hydrotreatment, hydrocracking or catalytic cracking, reforming catalysts or even any contact masses used for example in thermal cracking processes.

The invention may also relate to (a) any refining reaction in the presence of a fluidized or mobile catalyst or (b) the combustion of coal.

In accordance with the present addition, the solid circulates from top to bottom in the peripheral compartment, in a fluidized bed. I1 is driven by first fluidization means (a ring or a grid) which are adapted to deliver in this peripheral compartment a fluidization speed of for example between 1 cm / s and 10 cm / s. I1 then crosses a passage space at the base of the exchanger and rises in the central compartment in a fluidized bed. Second fluidization means (ring or grid) are in fact adapted to deliver, in the central compartment of generally larger volume, a fluidization speed for example between 0.1 m / s and 1 m / s. The fluidization pressure is higher in the ascending part than the fluidization pressure in the descending part. The thermal flow is adjusted by playing on a pressure differential between the two compartments.

Claims (1)

 CLAIM Method for regulating or controlling the thermal level in a continuous fluidized or mobile bed treatment of a pulverulent solid, the method comprising at least one treatment zone into which said solid is introduced and a treatment of this solid is carried out in a dense or mobile fluidized bed zone, at least part of the solid is withdrawn from said dense or mobile fluidized bed, this part of solid is sent to a regulation or control zone of the thermal level which is advantageously elongated and having an axis of symmetry, we proceed to a thermal regulation by indirect heat exchange with a fluid, the part of the solid thus thermally regulated is reintroduced into said dense or mobile fluidized bed, the method being characterized in that it is circulated by means of an inert fluid or not in a dense or mobile fluidized bed, said part of the solid in the regulation zone comprising an internal partition dividing which defines two adjacent compartments, elongated along said axis and communicating through their lower part, one of the two compartments being disposed at the periphery of the regulation zone, the other compartment being disposed in the central part of said zone, the solid circulating at the fluidized state from one compartment to another, said solid traveling from top to bottom in the fluidized state in the peripheral compartment, then circulates from bottom to top in the fluidized state in the central compartment, the fluidization pressure being higher in the ascending part than that of the descending part.