Oxy-PFBC temperature management through staged gas injection and gas velocity management
AssigneeGas Technology Institute
InventorsWilliam W. Follett, IV, Douglas M. Heim
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Abstract
A pressurized fluidized bed combustor (PFBC) and method of operation. A heated diluent is used alone or in combination with adjustments to a combustor gas velocity, to manage the bed temperature and keep it within allowable ranges. The diluent can be taken from the combustor flue gas, and recycled and reheated through the fluidized bed.
Claims20
A method of operating a pressurized fluidized bed combustor (PFBC) with a multi-stage heat exchanger, the method comprising:
- adjusting a quantity and temperature of diluent injected with an oxidizer into the PFBC, wherein the adjusting the quantity and temperature of the diluent injected comprises a multi-stage diluent injection;
- injecting a first diluent injection upstream of a first heat exchanger;
- and
- injecting a second diluent injection downstream of the first heat exchanger.
A method of operating a pressurized fluidized bed combustor (PFBC) with a multi-stage heat exchanger, the method comprising adjusting a combustor gas velocity, wherein the adjusting the combustor gas velocity comprises adjusting both a fuel flow rate and a gas flow rate of a diluent and an oxidizer, wherein the gas flow rate is increased proportional to the fuel flow rate.
A pressurized fluidized bed combustor PFBC) comprising an adjustable diluent injection system, wherein the adjustable diluent injection system comprises a first diluent injection port upstream of a first heat exchanger, and a second diluent injection port upstream of a second heat exchanger and downstream of the first heat exchanger.
A pressurized fluidized bed combustor (PFBC) comprising:
- an adjustable diluent injection system;
- a combustor housing containing a granular solid substrate;
- a first injection area including a first fuel injector for a fuel and a first oxidizer injector for an oxidant and a diluent;
- a first heat exchanger downstream of the first injection area;
- a second injection area downstream of the first heat exchanger, and including a second fuel injector for the fuel and a second oxidizer injector for the oxidant and the diluent;
- and
- a second heat exchanger downstream of the second injection area.
Dependencies are inferred from the claim text.