# US 4,400,150 A · Fluidized bed combustor distributor plate assembly

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- Number: US 4,400,150 A
- Document ID: US4400150A
- Status: Granted
- Kind: A
- Application number: 06/198,919
- Filed: 1980-10-20
- Granted: 1983-08-23
- Earliest claimed: 1980-10-20
- Assignees: Stone-Platt Fluidfire Limited
- Inventors: Willard P. Smith; Bruce R. Hutchinson
- Web page: https://patentgrep.com/patent/US4400150A

## CPC

- B01J 8/1818: {Feeding of the fluidising gas (B01J8/44 takes precedence)}
- F23C 10/00: Fluidised bed combustion apparatus
- F23C 10/20: Inlets for fluidisation air, e.g. grids; Bottoms
- F23C 10/24: Devices for removal of material from the bed (devices for controlling the level of the bed or the amount of material in the bed F23C10/30)
- F23C 10/28: Control devices specially adapted for fluidised bed, combustion apparatus
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- F23C: METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN {A CARRIER GAS OR} AIR (burners F23D)

## Abstract

A fluidized bed combustor having a distributor plate assembly including an inverted frustopyramidal surface with slots and offset shields thereover to form laterally oriented air flow openings into the combustion chamber from a first plenum for debris particle classification along said surface. At the bottom of each frustopyramidal surface is an outlet for classified debris. Air flow riser tubes project up from a second plenum to a position above said surface. Forced air is supplied to the slots and the risers, with means to regulate relative flow to them. Projecting down from the debris outlets are drop tubes having cooling fins, such tubes connecting to inlets of an auger conveyor. The auger conveyor has a coolant-cooled housing and a coolant-cooled auger.

## Claims

### Claim 1

A fluidized bed combustor comprising:
a combustion chamber;
a distributor plate assembly at the bottom of said chamber, including a distributor plate with downwardly sloping surfaces; said surfaces having slots with vertically spaced shields thereabove to form laterally oriented air flow openings to said chamber to cause particle classification along said sloped surfaces; air flow riser tubes in addition to said shielded slots, projecting up through said surfaces to a position elevated thereabove, having air inlets at the bottom and outlets at the top;
means for supplying forced air to said slots for the three purposes of classification, fluidization, and combustion, and to said risers for the two purposes of fluidization and combustion; and
means for controlling classification of the fluidized bed independent from fluidization thereof comprising means for regulating the proportion of air flow to said slots with respect to the air flow to said riser whereby variation of the relative rate of air flow through said slots and said risers changes the classification relative to the fluidization of the fluidized bed.

### Claim 2 (depends on 1)

The combustor in claim 1 wherein said slots and shields are elongated and oriented with the long dimension thereof oriented down said sloping surfaces.