Waste heat recovery
AssigneePhillips Petroleum Company
InventorWilliam T. Cooper
Life of this patent
Estimating the term…
Abstract
A fixed fluidized particulate solids bed heat recovery vessel or steam generator having indirect heat exchange means within a bed of fluidized carbonaceous solids, such as coke, pelleted carbon black and the like, and introduction of a gas containing entrained solids to effect fluidization of the bed of carbonaceous solids wherein in a preferred embodiment, the reaction effluent from a carbon black reaction zone comprising carbon black suspended in a non-oxidizing gas is preferably quenched, e.g., using water and/or cooled recycled reaction effluent and is then further cooled using a fluidized fixed bed of carbonaceous solids having a cooling coil within the fluidized bed.
Claims9
A process for conducting indirect heat exchange between a gas stream containing suspended light solids and a heat exchange fluid in an indirect heat exchange zone containing fluidized fixed bed solids which comprises:
- (a) introducing a gas stream containing entrained solids into an inlet connected to a lower portion of an enlarged heat exchange zone containing a fluidized fixed bed of particulate carbonaceous solids and a heat exchange coil extending into said fluidized bed and having a heat exchange fluid flowing through said coil, said heat exchange zone being so sized that the actual gas passage space in said enlarged zone occupied by said fluidized fixed bed is substantially the same cross-sectional area as that of the gas inlet and gas outlet which prevents the suspended solids from accumulating in the fluidized bed and allows the suspended solids to flow in an entrained manner in the gas stream,
- (b) flowing said gas stream through said fluidized bed of particulate carbonaceous solids at a flow rate sufficient to maintain fluidized conditions and at a rate such that said gas is heated or cooled by the heat exchange fluid in said coil,
- (c) removing said gas stream containing suspended solids at a different temperature from an upper portion of said heat exchange zone,
- (d) passing said gas stream containing suspended solids to a gas-solids separation zone to separate suspended solids therefrom and recover cooled gas substantially reduced in suspended solids content, and
- (e) quenching said gas stream containing entrained solids prior to step (a) with water and at least a portion of said cooled gas recovered in (d).
Dependencies are inferred from the claim text.