TUYERE ASSEMBLY

• US 3,672,648 A
• Filed: 11/27/1970
• Issued: 06/27/1972
• Est. Priority Date: 11/27/1970
• Status: Expired due to Term

• Current Assignee: Franklin Carr Price
• Original Assignee: Franklin Carr Price
• Inventors: Price, Franklin Carr
• Primary Examiner(s): Camby, John J.
• Application Number:
  US05/093,274
• Time in Patent Office: 578 Days
• Field of Search: 263/21A 34/57R,57A
• US Class Current: 422/143
• CPC Class Codes: B01J 8/44 Fluidisation grids

Abstract

A tuyere for controlling flow through a hole in a flat reactor hearth which utilizes the Bernoulli effect to retain its position. The tuyere is essentially a flat disc with a centering shaft fitting loosely in the hearth hole to prevent sideways movement. Either metal, including sheet metal, or refractory material can be used to form the tuyere, and it can be shaped to completely block backflow or with port grooves to increase gas volume flow.

Claims

1. In a fluidized bed reactor having a wind box and a reaction chamber, the combination comprising, a substantially horizontal hearth separating the wind box from the reaction chamber, said hearth having a flat top surface and an opening extending from the wind box through said flat surface with no peripheral lip, and a tuyere for controlling flow through the opening, said tuyere having a substantially flat body on said surface overlying the opening and being at least approximately twice the size of said opening, said body having a stop surface cooperating with a portion of the hearth to prevent lateral movement of the body from said opening, the flow through said opening and against said body being substantially unimpeded so that said flow after striking said body expands radially and increases in velocity between the body and said flat surface to develop a force holding the tuyere in place.

2. The combination of claim 1 in which said opening and said tuyere body are substantially circular and the face of the body contacting said surface is recessed in its center portion, said stop surface being defined by a shaft on said body extending from the approximate center of said recess down into said opening.

3. The combination of claim 2 in which said contaCt face includes an unbroken periphery resting on said hearth surface without creating a gap between the tuyere and the hearth.

4. The combination of claim 2 in which said contact face is formed with a port groove extending radially from said recessed center portion.

5. The combination of claim 4 in which said groove extends through the periphery of said body.