US 4,242,077 A · Fluid bed furnace and fuel supply system for use therein

Abstract

A fuel supply system for use in a fluid bed furnace or the like of the type which includes a bed comprising a quantity of particles, which bed fluidizes in response to the flow of heated gases upwardly therethrough and a burner for burning a supplied fuel and providing the fluid bed with a sufficient gas mixture flow at an elevated temperature for heating and fluidizing the fluid bed. The fluid supply system includes a source of air, a source of gas fuel, mixing means coupled to the furnace burner for mixing the air and gas fuel together for providing the burner with a fuel mixture, flow rate control means for providing the air and gas fuel to the mixing means in substantially stoichiometric flow rate proportions and fluid bed level detecting means for sensing the level of the fluidizable material within the fluid bed and coupled to the flow rate control means for varying the flow rates of the gas fuel and air provided to the mixing means in direct relation to the level of the fluidizable material within the fluid bed. As a result, excessive agitation of the fluid bed is avoided.

Claims12

Dependent claims

A fuel supply system for use in a fluid bed furnace or the like of the type including a fluid bed containing a quantity of inert, particulate material which fluidizes in response to sufficient gas flow therethrough and a burner for burning a supplied fuel and providing the fluid bed with a gas mixture flow at an elevated temperature for heating and fluidizing the fluid bed, said fuel supply system comprising:

a source of air;
a source of gas fuel;
mixing means coupled to the furnace burner for mixing the air and gas fuel together for providing the burner with a fuel mixture;
flow rate control means for providing said air and gas fuel to said mixing means in desired proportions;
and fluid bed level detecting means for sensing the level of the inert fluidizable material within the fluid bed and coupled to said flow rate control means for varying the flow rates of the gas fuel and air provided to said mixing means in relation to the level of the fluidizable material within the fluid bed.

2 more elements

A fluid bed furnace comprising:

a fluid bed containing a quantity of inert, particulate material which fluidizes in response to gas flow therethrough;
a burner for burning a supplied fuel mixture and providing said fluid bed with a gas mixture at an elevated temperature for heating and fluidizing said fluidizable material;
a source of air;
a source of gas fuel;
combining means coupled to said burner for mixing the air and gas fuel together for providing said burner with a supplied fuel mixture;
flow rate control means for providing said air and said gas fuel to said combining means in desired proportions;
and fluid bed level detecting means for sensing the level of the inert fluidizable material within said fluid bed and coupled to said flow rate control means for varying the flow rates of said air and said gas fuel provided to said mixing means in direct relation to the level of the fluidizable material within said fluid bed.

4 more elements

Dependencies are inferred from the claim text.

Fluid bed furnace and fuel supply system for use therein

Life of this patent

Fluid bed furnace and fuel supply system for use therein

Life of this patent

Abstract

Claims12