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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. T

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.

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I claim: 1. 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 sepa

I claim: 1. 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; 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; and controlling the exhaust gas flow in the bypass duct to adjust the quantity of solid particles bypassing the particle separator, wherein the exhaust gas flow in the bypass duct is controlled by feeding additional gas to the bypass duct. 2. The method as recited in claim 1, further comprising controlling the exhaust gas flow in the bypass duct by a control damper arranged in the bypass duct. 3. 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 particle 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; a separate bypass duct, having a first end connected upstream of the particle separator, and a second end connected to the exhaust gas duct downstream of the particle separator, for conducting a portion of the exhaust gas with entrained solid particles to bypass the particle separator, wherein the entrained particles are not returned back to the furnace, thereby decreasing the quantity of solid particles in the furnace; and controlling means, provided in the bypass duct, for controlling the flow of exhaust gas in the bypass duct, wherein said controlling means comprises additional gas piping introducing gas into the bypass duct. 4. The apparatus as recited in claim 3, wherein the additional gas piping is provided with means for adjusting the quantity of gas introduced into the bypass duct. 5. The apparatus as recited in claim 3, wherein said first end of said bypass duct is connected to a top of said furnace. 6. The apparatus as recited in claim 3, wherein said first end of said bypass duct is connected to said discharge duct between a top of said furnace and said particle separator. 7. The apparatus as recited in claim 3, wherein said controlling means comprises a control damper arranged in said bypass duct. 8. The apparatus as recited in claim 3, wherein said bypass duct is lined to endure both the temperature and the solids flowing in said bypass duct. 9. The apparatus as recited in claim 3, wherein said particle separator is a cyclone separator.