Cyclone bypass for a circulating fluidized bed reactor
AssigneeFoster Wheeler Energy Corporation
InventorPonnusami Gounder
Life of this patent
Estimating the term…
Abstract
A method of and an apparatus for operating a circulating fluidized bed reactor having a furnace with a discharge port for exhaust gas, and a particle separator having an inlet connected to the exhaust gas discharge port and an outlet duct for the exhaust gas and a return duct for separated solids. The method includes the steps of arranging a bypass duct bypassing the particle separator, and conducting a partial flow of exhaust gas along the duct for increasing the fly ash content in the exhaust gas after the separator. The bypass duct is advantageously provided with means for controlling the flow of exhaust gas in the bypass duct.
Claims21
A method of operating a circulating fluidized bed reactor having a furnace with a discharge port for exhaust gas, and a particle separator for separating solid particles from the exhaust gas, having an inlet connected to the exhaust gas discharge port via an outlet duct for the exhaust gas, and a return duct for separated solid particles, the method comprising the steps of:
- arranging a bypass duct bypassing the particle separator;
- and
- conducting a partial flow of exhaust gas and solid particles entrained with the exhaust gas along the bypass duct for increasing the solid particle content in the exhaust gas after the particle separator, wherein the entrained particles are not returned back to the furnace.
A circulating fluidized bed reactor, said reactor comprising:
- a furnace having a fluidized bed of solid particles;
- a discharge port for removing exhaust gas with entrained solid particles from said furnace;
- a particle separator connected to said discharge port for separating solid particles from the exhaust gas, said particle separator having an exhaust gas outlet connected to an exhaust gas duct and a solids outlet connected to a return duct for recycling the separated solid particles back to the bottom of the furnace;
- and
- means for conducting a portion of the exhaust gas and solid particles entrained with the exhaust gas past said particle separator, wherein the entrained particles are not returned back to the furnace, thereby decreasing the quantity of solid particles in the furnace.
A method of operating a circulating fluidized bed reactor having a furnace for combustion, a discharge port connected to the furnace for conducting combustion exhaust gas, a discharge duct connected to the discharge port, and a particle separator connected to the discharge duct for separating solid particles from the exhaust gas, wherein connected to the particle separator are a return duct connecting the particle separator to the furnace and an exhaust duct for discharging exhaust gas from the particle separator, the method comprising the steps of:
- arranging a bypass duct connected to the furnace and the exhaust duct, wherein the bypass duct bypasses the particle separator;
- and
- conducting a partial flow of exhaust gas and solid particles entrained with the exhaust gas along the bypass duct for increasing the solid particle content in the exhaust gas after the particle separator, wherein the entrained particles are not returned back to the furnace.
A circulating fluidized bed reactor, said reactor comprising:
- a furnace having a fluidized bed of solid particles into which fuel and at least one gas are added for combustion;
- a discharge port connected to the furnace for removing from the furnace exhaust gas with entrained particles resulting from the combustion;
- a discharge duct connected to the discharge port;
- a particle separator connected to the discharge duct for separating solid particles from the exhaust gas;
- an exhaust gas outlet connected to the particle separator;
- an exhaust gas duct connected to the exhaust gas outlet for discharging the exhaust gas from the particles separator;
- a return duct connected to both the particle separator and the furnace for recycling the solids separated from the exhaust gas back to the furnace;
- and p1 means for conducting a portion of the exhaust gas with entrained solid particles from the furnace past the particle separator, wherein the entrained particles are not returned back to the furnace, thereby decreasing the quantity of solid particles in the furnace.
Dependencies are inferred from the claim text.