Abstract: A heat storage particle that includes a ceramic particle containing a vanadium oxide as a main component thereof, and a metal film covering the ceramic particle.

Abstract: A pulverized coal burner for an oxyfuel combustion boiler which attains uniform combustion from a pulverized coal burner and which constrains a temperature rise of an oxygen injection nozzle is provided. The burner includes burner inner and outer cylinders arranged to penetrate a wind box and come close to a throat portion. A pulverized coal feed passage is provided between the burner inner and outer cylinders. A plurality of oxygen injection devices are arranged outwardly of the burner outer cylinder so as to directly feed oxygen ahead of the burner outer cylinder.

Abstract: Provided are a method and an apparatus of controlling an oxygen supply in an oxyfuel combustion boiler capable of attaining stable oxyfuel combustion even when properties of coal are changed. A boiler-brought-in oxygen density is obtained when coal with a fuel ratio measured by fuel measuring means 39 is burned stably with oxygen in a boiler 4 so that a relationship between the fuel ratio and/or carbon content of the coal and the boiler-brought-in oxygen density is obtained and inputted in advance into the controller. When the coal is changed to the new kind of coal, a total amount of gases recirculated is regulated such that a boiler-brought-in oxygen density becomes accordance with a fuel ratio and/or a carbon content which is measured in advance for the new kind of coal.

Abstract: Stable operation of oxyfuel combustion boiler is ensured and amplification in likelihood of or downsizing of forced draft fan is attained. Upon change of commanded boiler load from start value to target value by target time, a feed amount of oxygen from oxygen producing device is regulated for attainment of oxygen concentration on entry side of the boiler body from reference value to attainment point or target entry-side oxygen concentration within entry-side oxygen concentration regulation range by target time. After attainment to attainment point, control is made to return entry-side oxygen concentration to reference value at return point. Airflow rate of forced draft fan is controlled with change rate smaller than change rate with which air flow rate of forced draft fan reaches target value by target time.

Abstract: In an oxygen mixer for an oxygen combustion boiler, circulating exhaust gas heated in a rotary preheater is mixed with oxygen. Resultant mixed gas is guided to a boiler furnace through a combustion gas duct having bends. At the bend closest to the rotary preheater in the combustion gas duct, an oxygen injection nozzle is arranged to have a plurality of injection ports for injection of oxygen into circulating exhaust gas.

Abstract: An apparatus of controlling oxygen supply for a boiler having wind boxes 2a and 2b arranged on left and right of a boiler body 1 is configured to control supply balance of oxygen by adjusting oxygen supply opening degrees of the left and right oxygen distribution dampers 15a and 15b in accordance with a oxygen supply flow rate and left and right actually measured oxygen concentrations when controlling the oxygen supply amounts and to control the exhaust gas flow rates by correcting an exhaust gas flow rate set value corresponding to a boiler load demand in accordance with an oxygen concentration set value corresponding to a boiler load demand, left and right actually measured exhaust gas flow rates and left and right actually measured oxygen concentrations and adjusting left and right exhaust gas introduction opening degrees of the left and right exhaust gas introduction dampers 8a and 8b when controlling the exhaust gas flow rates.

Abstract: In an apparatus of controlling an exhaust gas in an oxyfuel combustion boiler having the boiler 4 provided with burners 6 and a two-stage combustion port 7, a primary recirculation line 12 through which pulverized coal obtained by a mill 3 is fed to the burners 6 of the boiler 4 by the primary recirculating exhaust gas, a secondary recirculation line 14 through which another portion of the exhaust gas in recirculation is fed to a wind box 5 of the boiler 4, an oxygen producer 23, a direct supply line 25 through which a portion of oxygen produced by the oxygen producer 23 is directly fed to the burner 6 and a secondary oxygen mixing line 24 through which another portion of oxygen produced by the oxygen producer 23 is fed to the secondary recirculation line 14, the apparatus comprises an oxygen supply line 26 through which oxygen is fed to the two-stage combustion port of the boiler 4 and a flow rate regulator 20, 27 in the oxygen supply line for adjusting oxygen density.

Abstract: Provided are a method and an apparatus for controlling combustion in an oxygen fired boiler which are easily applicable to an existing air fired boiler for easy and stable control of the combustion. Oxygen with a setting amount in accordance with a boiler load demand 35 is supplied to a boiler body 4. Heat absorption amount of the boiler is measured from inlet temperature of feedwater supplied to the boiler body 4 and outlet temperature of steam. Recirculation flow rate of combustion exhaust gas 14a is controlled such that heat absorption amount 41 of the boiler body 4 becomes equal to a targeted heat absorption amount 42 to thereby control oxygen concentration in all gas guided to the boiler body 4.

Abstract: Stable operation of oxyfuel combustion boiler is ensured and amplification in likelihood of or downsizing of forced draft fan is attained. Upon change of commanded boiler load from start value to target value by target time, a feed amount of oxygen from oxygen producing device is regulated for attainment of oxygen concentration on entry side of the boiler body from reference value to attainment point or target entry-side oxygen concentration within entry-side oxygen concentration regulation range by target time. After attainment to attainment point, control is made to return entry-side oxygen concentration to reference value at return point. Airflow rate of forced draft fan is controlled with change rate smaller than change rate with which air flow rate of forced draft fan reaches target value by target time.

Abstract: Provided are a method and an apparatus of controlling a flow rate of a primary recirculating exhaust gas in an oxyfuel combustion boiler, capable of realizing a stable combustion by a burner in oxyfuel combustion. Weight ratio of flow rate of primary recirculating exhaust gas [ton/h] to amount of pulverized coal from a mill [ton/h] is defined as G/C, and the flow rate of primary recirculating exhaust gas is controlled so that the G/C falls within a given range.

Abstract: Provided are a method and an apparatus of controlling exhaust gas in an oxyfuel combustion boiler which can attain stable combustion of the boiler while an amount of unburned combustibles and a NOx density in exhaust gas are maintained in their allowable ranges. A rate of supply of directly supplied oxygen to burners 6 to a total amount of oxygen produced by an air separation unit 18 is regulated in an operating range where the NOx density in the exhaust gas is below a NOx limit value and the amount of unburned combustibles in the exhaust gas is blow an unburned combustible limit value to thereby attain stable combustion of the oxyfuel combustion boiler.

Abstract: To prevent electrolytic corrosion from occurring by reliably establishing an electrical conduction between a motor output shaft and brackets. A first bracket 51 attached to one end part and a second bracket 52 attached to the other end part are electrically connected to each other via a conductive member 8 embedded in a molding resin part 21 of a stator 2.

Abstract: Provided are fuel feed means 3, an air separation unit 6 air feed means 7, a combustion furnace 11 with a burner 9 for combustion, an exhaust gas line 14 for leading an exhaust gas from the combustion furnace 11 to outside of the combustion furnace 11, exhaust gas treatment means 20a and 20b included in the exhaust gas line 14, and a recirculation line 15 for circulating a portion of the exhaust gas at least exhaust gas treatment means 20a and 20b for recirculation of a portion of the exhaust gas at least dust-removed by the exhaust gas treatment means 20a and 20b to the burner. Further provided are exhaust gas capture means 18 for taking out carbon dioxide gas from a remaining non-recirculating exhaust gas, and carbon dioxide gas feed means 33, 40 and 46 for introducing carbon dioxide gas to equipments 10, 20a and 20b of the oxyfuel combustion boiler facility.

Abstract: In an oxygen mixer for an oxygen combustion boiler, circulating exhaust gas heated in a rotary preheater is mixed with oxygen. Resultant mixed gas is guided to a boiler furnace through a combustion gas duct having bends. At the bend closest to the rotary preheater in the combustion gas duct, an oxygen injection nozzle is arranged to have a plurality of injection ports for injection of oxygen into circulating exhaust gas.

Abstract: There is provided an electrical motor in which the dimensional accuracy of a stator is increased more easily, and the influence exerted on a magnetic circuit is kept as little as possible. In an electrical motor in which the stator 3 formed with n number (n is a positive integer) of teeth 33 in a row in a straight line form is bent into an annular shape and the end parts thereof are connected to each other, the sum of opening angles ? of a cutout 35 formed between segments of the stator 3 is made larger than 360 degrees, and a minute clearance is formed between the opposed surfaces of the cutout 35 when the stator is bent into an annular shape.

Abstract: In an apparatus of controlling an exhaust gas in an oxyfuel combustion boiler having the boiler 4 provided with burners 6 and a two-stage combustion port 7, a primary recirculation line 12 through which pulverized coal obtained by a mill 3 is fed to the burners 6 of the boiler 4 by the primary recirculating exhaust gas, a secondary recirculation line 14 through which another portion of the exhaust gas in recirculation is fed to a wind box 5 of the boiler 4, an oxygen producer 23, a direct supply line 25 through which a portion of oxygen produced by the oxygen producer 23 is directly fed to the burner 6 and a secondary oxygen mixing line 24 through which another portion of oxygen produced by the oxygen producer 23 is fed to the secondary recirculation line 14, the apparatus comprises an oxygen supply line 26 through which oxygen is fed to the two-stage combustion port of the boiler 4 and a flow rate regulator 20, 27 in the oxygen supply line for adjusting oxygen density.

Abstract: Provided are a method and an apparatus of controlling a flow rate of a primary recirculating exhaust gas in an oxyfuel combustion boiler, capable of realizing a stable combustion by a burner in oxyfuel combustion. Weight ratio of flow rate of primary recirculating exhaust gas [ton/h] to amount of pulverized coal from a mill [ton/h] is defined as G/C, and the flow rate of primary recirculating exhaust gas is controlled so that the G/C falls within a given range.

Abstract: In order to provide a pulverized coal burner for an oxyfuel combustion boiler which attains uniform combustion from a pulverized coal burner and which constrains a temperature rise of an oxygen injection nozzle, burner inner and outer cylinders are arranged to penetrate a wind box 2 and come close to a throat portion 3. A pulverized coal feed passage 9 is provided between the burner inner and outer cylinders 4 and 5. A plurality of oxygen injection means 11 are arranged outwardly of the burner outer cylinder 4 so as to directly feed oxygen ahead of the burner outer cylinder 4.

Abstract: Provided are a method and an apparatus of controlling exhaust gas in an oxyfuel combustion boiler which can attain stable combustion of the boiler while an amount of unburned combustibles and a NOx density in exhaust gas are maintained in their allowable ranges. A rate of supply of directly supplied oxygen to burners 6 to a total amount of oxygen produced by an air separation unit 18 is regulated in an operating range where the NOx density in the exhaust gas is below a NOx limit value and the amount of unburned combustibles in the exhaust gas is blow an unburned combustible limit value to thereby attain stable combustion of the oxyfuel combustion boiler.

Abstract: A method and an apparatus of controlling combustion in an oxyfuel combustion boiler are provided which ensure a sufficient furnace heat absorption through prevention of lowering of flame temperature, enabling oxyfuel combustion operations to be performed in a stable manner. A boiler-brought-in oxygen density which is an oxygen density for a total amount of gases introduced into a coal burning boiler is calculated and a flow rate of total recirculating gases is controlled such that the boiler-brought-in oxygen density falls within a predetermined range.