JP2011220541A - Boiler facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boiler facility enabling steady combustion by suppressing production of harmful substances by appropriately supplying gaseous fuel and fossil fuel into a boiler body.SOLUTION: The boiler facility includes: a gasifying furnace 10 generating the gaseous fuel by burning and gasifying biomass as fuel; and a boiler 30 recovering heat generated by burning the gaseous fuel generated in the gasifying furnace and fossil fuel. The boiler body 31 of the boiler 30 includes: a plurality of combustion burners 33 for the fossil fuel, which are provided along the circumferential direction and form flame of a given form by injecting the fossil fuel and air; and a plurality of combustion burners 34 for the gaseous fuel, which are provided along the circumferential direction on the wall part of the boiler body 31 below the combustion burners 33 for the fossil fuel, and inject the gaseous fuel and air toward the flame formed by the combustion burners 33 for the fossil fuel.

Description

  The present invention relates to a gasification furnace that generates carbon monoxide, hydrogen, and the like by burning and gasifying biomass and generating this as gas fuel, a gas fuel generated using biomass, and a fossil fuel such as coal and oil Is combined with the fuel as a fuel, and the boiler equipment is capable of recovering the heat generated by the combustion.

  Various gasification furnaces have been proposed in which carbon monoxide, hydrogen, and the like are generated by gasifying biomass as fuel, and this is generated as gas fuel. In addition, various boilers have been proposed in which heat is generated by burning fossil fuels such as coal and oil as fuel, and the generated heat is recovered. And the equipment which supplies the gas fuel produced | generated with the gasification furnace to a boiler, uses this gas fuel and a fossil fuel together as a fuel, burns, and collect | recovers heat is described in the following patent document 1, for example Has been.

US Pat. No. 4,676,177

  In a facility that combines such a gasification furnace and a boiler, gas fuel and air are injected into the boiler body by a combustion burner, and fossil fuel and air are injected by another combustion burner and ignited. And burn. In this case, since the components of gas fuel and fossil fuel are different from each other, it is necessary to appropriately supply and burn them in the boiler body.

  This invention solves the subject mentioned above, and provides the boiler equipment which suppresses generation | occurrence | production of a harmful substance and enables stable combustion by supplying gas fuel and a fossil fuel appropriately in a boiler main body. For the purpose.

  In order to achieve the above object, the boiler equipment of the present invention comprises a gasification furnace that generates gas fuel by burning and gasifying biomass as fuel, and gas fuel and fossil fuel generated in the gasification furnace. A boiler that recovers heat generated by combustion, the boiler having a hollow shape capable of combusting gas fuel and fossil fuel, and provided in the boiler body along the circumferential direction and fossil A plurality of fossil fuel combustion burners that form a flame of a predetermined form by injecting fuel and air, and provided in the boiler body in the circumferential direction above or below the fossil fuel combustion burner. A plurality of gas fuel combustion burners for injecting gas fuel and air toward a flame formed by the fossil fuel combustion burner.

  Accordingly, the combustion burner for fossil fuel forms a predetermined form of flame by injecting fossil fuel and air, and the combustion burner for gas fuel is directed toward the flame formed by the combustion burner for fossil fuel. Gas fuel and air will be injected, and by properly supplying gas fuel and fossil fuel into the boiler body, the gas fuel can cool the flame caused by fossil fuel or inhibit its form In addition, it is possible to suppress the generation of harmful substances and enable stable combustion.

  In the boiler facility of the present invention, the plurality of fossil fuel combustion burners can form a flame that swirls around a center position along a vertical direction of the boiler body as an axis, and the plurality of gas fuel burners This combustion burner is characterized by injecting gaseous fuel and air in the tangential direction to the swirling flame.

  Therefore, since the combustion burner for gas fuel injects the gas fuel and air in the tangential direction of the flame swirled by the combustion burner for fossil fuel, the gas fuel does not inhibit the swirl flow of the flame by the fossil fuel. And stable combustion is possible.

  In the boiler equipment according to the present invention, the boiler body has a rectangular cross-sectional shape, and the plurality of fossil fuel combustion burners and the plurality of gas fuel combustion burners are disposed on a wall portion or a corner portion of the boiler body. It is characterized by being.

  Therefore, the combustion burner for fossil fuel and the combustion burner for gas fuel can stably supply fuel and air into the boiler body.

  In the boiler facility of the present invention, the plurality of fossil fuel combustion burners and the plurality of gas fuel combustion burners inject fuel and air in the same direction toward the flame in the boiler body, respectively. It is said.

  Therefore, stable combustion can be ensured by appropriately mixing fossil fuel, gas fuel, and air.

  In the boiler facility of the present invention, the combustion burner for gas fuel has an outer cylinder positioned outside the inner cylinder, so that a gas fuel passage and an air passage are formed inside and outside, and the gas fuel passage is formed at the tip portion. And the air passage are combined to form an injection port for injecting gas fuel and air.

  Therefore, stable combustion can be ensured by appropriately mixing and injecting the gas fuel and air.

  In the boiler equipment of the present invention, a predetermined flow rate difference is set between the flow rate of the gas fuel flowing in the gas fuel passage and the flow rate of the air flowing in the air passage in the combustion burner for the gas fuel. It is characterized by that.

  Therefore, since the flow rate of the gas fuel is different from the flow rate of the air, the gas fuel and the air are appropriately mixed, and the mixing of both can be promoted to enable stable combustion.

  According to the boiler equipment of the present invention, a gasification furnace that generates gas fuel by burning and gasifying biomass as fuel, and heat generated by burning the gas fuel and fossil fuel generated in the gasification furnace are generated. A recovery boiler is provided, and the boiler is directed to a flame formed by a plurality of fossil fuel combustion burners that form a predetermined form of flame by injecting fossil fuel and air, and a fossil fuel combustion burner. Multiple combustion burners for injecting gas fuel and air are provided, and gas combustion and fossil fuel are appropriately supplied into the boiler body to suppress the generation of harmful substances and achieve stable combustion. Can be possible.

FIG. 1 is a schematic configuration diagram illustrating a boiler facility according to a first embodiment of the present invention. FIG. 2 is a layout diagram of fossil fuel combustion burners in a conventional boiler constituting the boiler equipment of the first embodiment. FIG. 3 is a cross-sectional view of a combustion burner for gas fuel in a conventional boiler that constitutes the boiler facility of the first embodiment. FIG. 4 is a layout diagram of a combustion burner for gas fuel in a conventional boiler constituting the boiler equipment of the first embodiment. FIG. 5 is a layout diagram of fossil fuel combustion burners in a conventional boiler constituting boiler equipment according to a second embodiment of the present invention. FIG. 6 is a layout diagram of a combustion burner for gas fuel in a conventional boiler constituting the boiler equipment of the second embodiment.

  Exemplary embodiments of boiler equipment according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example.

  FIG. 1 is a schematic configuration diagram illustrating a boiler facility according to a first embodiment of the present invention, FIG. 2 is a layout diagram of a combustion burner for fossil fuel in a conventional boiler constituting the boiler facility of the first embodiment, and FIG. FIG. 4 is a sectional view of a combustion burner for gas fuel in a conventional boiler constituting the boiler facility of Example 1, and FIG. 4 is an arrangement view of the combustion burner for gas fuel in the conventional boiler constituting the boiler facility of Example 1.

  The boiler equipment of Example 1 is a boiler equipment capable of recovering heat generated by combustion using gas fuel generated using biomass and fossil fuel such as coal and oil as fuel. is there.

  As shown in FIG. 1, the boiler facility of the first embodiment includes a gasification furnace 10 that generates gas fuel by burning and gasifying biomass, and a gas fuel and a fossil fuel generated in the gasification furnace 10. The boiler 30 which collect | recovers the heat | fever generate | occur | produced by burning is produced.

  Here, biomass is defined as organic resources derived from renewable organisms, excluding fossil resources. For example, thinned wood, waste wood, driftwood, grass, waste, sludge, tires, and pellets such as recycled fuel (pellets and chips) reduced in weight, and are not limited to those presented here. .

The gasification furnace 10 is a circulating fluidized bed type gasification furnace, and has a gasification furnace body 11. In this case, not only a circulating fluidized bed format but also a bubble type circulating fluidized bed format may be used. This gasification furnace main body 11 has a hollow shape and is installed along the vertical direction, and each of the upper and lower walls and the surrounding walls are entirely made of a refractory material, and is capable of preventing heat dissipation to the outside. Operation is possible at 500 to 1000 ° C. The gasification furnace main body 11 can supply fluidized sand as a fluidized material and biomass as a fuel. The temperature of the fluidized sand is increased by burning and gasifying the biomass inside, and carbon dioxide is mainly used. A combustible gas is generated as a component, and a gasification reaction occurs using this combustible gas as a gasifying agent. Here, as the fluidized sand, for example, silica sand (as a main component, SiO ₂ , Al ₂ O _3, etc.) is used to remove (desulfurize) sulfur from the gas generated in the gasification furnace main body 11. , Calcium carbonate (CaCO ₃ ) may be added.

  As a fuel supply system, a hopper 12, a screw feeder 13, a conveyor 14, and a supply pipe 15 are provided. The hopper 12 can store a predetermined amount of biomass, and the screw feeder 13 can supply the biomass stored in the hopper 12 by a predetermined amount. The conveyor 14 can convey the biomass supplied from the screw feeder 13, and removes mixed metal foreign matters such as nails and hinges by a magnetic separator (not shown). Then, the biomass is introduced into the gasifier main body 11 from the side through the supply pipe 15.

  In the fuel supply system, a drying device 16 is provided above the hopper 12. The drying device 16 removes moisture contained in the biomass.

  The gasifier main body 11 is connected to a cyclone 17 that separates combustible gas and fluidized sand. That is, the upper part of the gasifier main body 11 is connected to the upper part of the cyclone 17 via the discharge pipe 18, and the lower part of the cyclone 17 is below the gasifier main body 11 via the circulation pipe 19. The seal pod 20 is attached to the circulation pipe 19.

  An air supply system for supplying combustion / gasification air to the gasification furnace main body 11 is provided. That is, the end of the air supply pipe 21 constituting the air supply system is connected to the lower portion of the gasification furnace main body 11, and the air supply branch pipe 22 branched from the air supply pipe 21 is connected to the seal pod 20. ing. As will be described later, the air supply pipe 21 can supply high-temperature air heated to 200 to 350 ° C. from the lower part of the gasification furnace main body 11 to the inside, and is supplied to the seal pod 20 through the air supply branch pipe 22. can do.

  The gasification furnace main body 11 is connected to a lower portion of a foreign matter discharge pipe 23 for removing foreign matters mixed in the biomass.

  The cyclone 17 is connected to a combustible gas generated in the upper portion, that is, a gas fuel pipe 24 for supplying gaseous fuel. The gas fuel pipe 24 is for conveying the gas fuel to the boiler 30, and a dust removing device 25 and a cyclone 26 are provided in the middle part. The dust removing device 25 collects and removes a component that does not become a fuel that has a high specific gravity and is difficult to ride on a gas fuel flow, specifically, powder mainly composed of silica sand, by reducing the flow velocity. Therefore, the dust removing device 25 is provided with a powder discharge pipe 27 in the lower part. The cyclone 26 has a ceramic filter and removes fine char that could not be removed by the cyclone 17. Therefore, the cyclone 26 is provided with a char discharge pipe 28 in the lower part.

The gas fuel generated in the gasification furnace 10 is composed mainly of carbon monoxide (CO), hydrogen (H ₂ ), carbon dioxide (CO ₂ ), nitrogen (N), etc., and has a viscosity of 300 to 1100 kcal / It is a low calorie gas of about Nm ³ and is produced by the gasifier 10 in the range of 650 to 850 ° C.

  Therefore, in the gasification furnace 10, the gasification furnace main body 11 is supplied with fluid sand from a supply path (not shown), and the biomass is stored in the hopper 12 after being dried by the drying device 16. The gasification furnace main body 11 is charged through the supply pipe 15 by the screw feeder 13 and the conveyor 14. Further, the gasification furnace main body 11 is supplied with high-temperature air for gasification from the lower part through the air supply pipe 21. Then, fluidized sand and biomass are fluidly mixed in the gasification furnace main body 11, and the biomass is combusted and gasified to generate combustible gas.

  The combustible gas generated by the combustion and gasification is discharged to the cyclone 17 through the discharge pipe 18 together with the fluidized sand, and is separated into the combustible gas and the fluidized sand by the cyclone 17. The separated combustible gas is supplied as gas fuel to the boiler 30 through the gas fuel pipe 24. At this time, the gas fuel flowing through the gas fuel pipe 24 collects and removes powder mainly composed of silica sand by the dust removing device 25, and fine char is removed by the cyclone 26. Further, the high-temperature fluidized sand separated by the cyclone 17 is returned to the gasifier main body 11 by the circulation pipe 19 through the seal pod 20.

  On the other hand, the boiler 30 is a conventional boiler and has a boiler body 31 capable of burning gas fuel and fossil fuel. The boiler main body 31 has a hollow shape and is installed in the vertical direction, and a combustion device 32 is provided at the lower part of the boiler main body wall constituting the boiler main body 31. The combustion device 32 includes a plurality of fossil fuel combustion burners 33 mounted on the boiler body wall and a plurality of gas fuel combustion burners 34. In the present embodiment, four combustion burners 33 for fossil fuels are arranged in four stages along the circumferential direction. On the other hand, four combustion burners 34 for gas fuel are disposed below the plurality of combustion burners 33 for fossil fuels, and four are disposed along the circumferential direction in the vertical direction. The arrangement relationship between the combustion burner 33 for fossil fuel and the combustion burner 34 for gas fuel may be upside down. In each combustion burner 33, 34, the number in the circumferential direction is not limited to four, and the number of stages is not limited to four or one stage. Furthermore, you may arrange | position so that each combustion burner 33 and 34 may be opposed.

  The combustion burner 33 for fossil fuel is connected to a pulverized coal supply unit 35 via a supply pipe 36 and to a fuel oil (or fuel gas) supply part 37 via a supply pipe 38. In this case, pulverized coal or fuel oil can be supplied as the fossil fuel. On the other hand, the gas fuel combustion burner 34 is connected to the gas fuel pipe 24 from the gasification furnace 10. In this case, the gas fuel supplied from the gas fuel pipe 24 to the combustion burner 34 for gas fuel is preferably maintained at 400 ° C. or higher.

  Further, the combustion device 32 has an air supply pipe 39 capable of supplying combustion air to the combustion burners 33 and 34. The air supply pipe 39 has a blower 40 attached to a base end portion thereof, and a distal end portion. Is connected to a wind box 41 provided on the outer peripheral side of the boiler body 31. Therefore, the air supplied to the wind box 41 can be supplied to the combustion burners 33 and 34.

  The boiler body 31 has a flue 42 connected to the upper portion thereof, and the superheaters 43 and 44, the reheaters 45 and 46, and the nodes for recovering the heat of the exhaust gas as a convection heat transfer section are connected to the flue 42. Charcoal units 47, 48, and 49 are provided, and heat exchange is performed between the exhaust gas generated by the combustion in the boiler body 31 and water.

  The flue 42 is connected to an exhaust gas pipe 50 through which the exhaust gas subjected to heat exchange is discharged downstream. The exhaust gas pipe 50 is provided with an air heater 51 between the air supply pipe 39 and performs heat exchange between the air flowing through the air supply pipe 39 and the exhaust gas flowing through the exhaust gas pipe 50, and It is desirable to raise the temperature of combustion air to be supplied to a range of 200 to 300 ° C.

  The air supply pipe 39 is branched from a position downstream of the air heater 51, and the air supply pipe 21 is provided. The air supply pipe 21 is equipped with a dust removing device 52 capable of removing particulate matter such as dust and dust, and a blower 53 capable of boosting high-temperature air. Air heated by an air heater 51 to 200 to 300 ° C. The gasification furnace 10 can be supplied into the gasification furnace body 11. In this case, without using the air heated to 200 to 300 ° C. by the air heater 51, after the air is sucked from the outside and heated as necessary, the gasification of the gasifier 10 is performed through the air supply pipe 21. You may supply in the furnace main body 11. FIG. As the heat source for raising the temperature of the air, it is efficient to use gas fuel generated in the gasification furnace 10, fluidized sand separated by the cyclone 17, or the like.

  The exhaust gas pipe 50 is located upstream of the air heater 51 and is provided with a selective reduction catalyst 54, and is located downstream of the air heater 51 and is provided with an electric dust collector 55, an induction blower 56, and a desulfurization device 57. A chimney 58 is provided at the downstream end.

  Accordingly, when the blower 40 is driven in the boiler 30 to suck air, the air is heated by the air heater 51 through the air supply pipe 39 and then supplied to the combustion burners 33 and 34 through the wind box 41. . Further, pulverized coal or fuel oil as fossil fuel is supplied to the combustion burner 33 for fossil fuel through the supply pipes 36 and 38, and gas fuel from the gasifier 10 is supplied to the gas fuel through the gas fuel pipe 24. The combustion burner 34 is supplied.

  Then, the combustion burner 33 for fossil fuel injects combustion air and fossil fuel into the boiler body 31 and ignites at the same time, and the combustion burner 34 for gas fuel ignites combustion air and gas fuel to the boiler body 31. Ignites simultaneously with injection. In the boiler body 31, combustion air, fossil fuel, and gas fuel are burned to generate a flame. When a flame is generated in the lower part of the boiler body 31, the combustion gas rises in the boiler body 31 and is discharged to the flue 42.

  At this time, water supplied from a water supply pump (not shown) is preheated by the economizers 47, 48, and 49, then supplied to a steam drum (not shown), and supplied to each water pipe (not shown) on the boiler body wall. It is heated to become saturated steam and fed into a steam drum (not shown). Further, saturated steam of a steam drum (not shown) is introduced into the superheaters 43 and 44 and is heated by the combustion gas. The superheated steam generated by the superheaters 43 and 44 is supplied to a power plant (not shown) such as a turbine. Further, the steam taken out in the middle of the expansion process in the turbine is introduced into the reheaters 45 and 46, overheated again, and returned to the turbine. In addition, although the boiler main body 31 was demonstrated as a drum type | mold (steam drum), it is not limited to this structure.

  Thereafter, the exhaust gas that has passed through the economizers 47, 48, and 49 of the flue 42 is removed of harmful substances such as NOx by the selective reduction catalyst 54 in the exhaust gas pipe 50, and the particulate matter is removed by the electric dust collector 55. After the sulfur content is removed by the desulfurization device 57, it is discharged from the chimney 58 to the atmosphere.

  In the boiler 30 of the boiler equipment according to the first embodiment configured as described above, as described above, the combustion device 32 is provided in the lower portion of the boiler body 31, and the combustion device 32 is a combustion burner 33 for a plurality of fossil fuels. And a plurality of combustion burners 34 for gas fuel. As shown in FIG. 2, the boiler main body 31 has a rectangular cross-sectional shape, and four combustion burners 33 for fossil fuel are arranged on the wall portion of the boiler main body 31 along the circumferential direction. Each combustion burner 33 for fossil fuel has the same shape, and an injection port is formed at the tip.

  Therefore, in the combustion burner 33 for fossil fuel, pulverized coal or fuel oil (or fuel gas) as fossil fuel is supplied from the supply pipes 36 and 38, and high-temperature air passes from the air supply pipe 39 to the wind box 41. If supplied, the mixture of fossil fuel and air can be injected into the boiler body 31 from the injection port.

  In this case, the combustion burner 33 for each fossil fuel can form a flame of a predetermined form in the boiler body 31 by injecting fossil fuel and air. Specifically, the combustion burner 33 for each fossil fuel can form a flame that swirls around the center position along the vertical direction of the boiler body 31 as an axis. In the combustion burner 33 for fossil fuel, a predetermined flow velocity difference is set between the flow velocity of the gas fuel flowing through the fossil fuel passage 63 and the flow velocity of air flowing through the air passage 64. Specifically, it is desirable to set a flow rate difference of 20 to 40 m / s between the flow rate of fossil fuel and the flow rate of air. Here, the flow rate of the fossil fuel and the flow rate of the air need only be high, and the flow rate of the fossil fuel may be high or the flow rate of the air may be high.

  On the other hand, as shown in FIGS. 3 and 4, four combustion burners 34 for gas fuel are arranged on the wall portion of the boiler body 31 along the circumferential direction. The combustion burner 34 for each gas fuel has an outer cylinder 72 positioned outside the inner cylinder 71, thereby forming a gas fuel passage 73 along the axial direction inside the inner cylinder 71, and the inner cylinder 71 and the outer cylinder An air passage 74 along the axial direction is formed between the air passage 72 and the air passage 72. The gas fuel passage 73 has a fuel injection port 75 formed at the tip, and the air passage 74 has an air injection port 76 formed at the tip.

  Therefore, in the combustion burner 34 for gas fuel, when gas fuel is supplied from the gas fuel pipe 24 and hot air is supplied from the air supply pipe 39 via the wind box 41, the gas fuel is supplied to the gas fuel passage 73. Then, the fuel injection port 75 is passed through, and the air passes through the air passage 74 and reaches the air injection port 76, and the mixture of the gas fuel and air can be injected into the boiler body 31.

  In this case, the combustion burner 34 for each gas fuel can inject gas fuel and air toward the flame formed by the combustion burner 33 for each fossil fuel. Specifically, the combustion burner 34 for each gas fuel has a combustion flame burner 33 for fossil fuel, with respect to a swirling flame that swirls around the center position along the vertical direction in the boiler body 31 as an axis. Gas fuel and air can be injected in the tangential direction. In the combustion burner 34 for gas fuel, a predetermined flow velocity difference is set between the flow velocity of the gas fuel flowing in the gas fuel passage 73 and the flow velocity of air flowing in the air passage 74. Specifically, it is desirable to set a flow rate difference of 20 to 40 m / s between the flow rate of gas fuel and the flow rate of air. Here, the flow rate of the gas fuel and the flow rate of the air need only be high, and the flow rate of the gas fuel may be high or the flow rate of the air may be high.

  The combustion burner 33 for fossil fuel and the combustion burner 34 for gas fuel have substantially the same configuration, and have substantially the same arrangement configuration, and a plurality of combustion burners 33 for fossil fuel and a plurality of combustion burners for gas fuel are used. After the swirl flame is formed in the boiler body 31, the combustion burner 34 injects fossil fuel and air, gas fuel and air in the same direction toward the swirl flame, respectively. In this case, the combustion burner 33 for each fossil fuel and the combustion burner 34 for each gas fuel inject fossil fuel and air, gas fuel and air toward the tangential direction of the swirling flame generated in the boiler body 31. However, since the combustion burner 34 for gas fuel is positioned below the combustion burner 33 for fossil fuel, the gas fuel and the combustion fuel burner 34 for the fossil fuel are directed upward with respect to the swirling flame formed by the combustion burner 33 for fossil fuel. Air will be injected.

  Further, the combustion burner 34 for gas fuel is not equipped with a flame holder. That is, the combustion burner 34 for gas fuel injects the gas fuel produced | generated in the gasifier 10, and although this gas fuel removes microparticles | fine-particles with the dust removal apparatus 25 or the cyclone 26, g / nm3 Ordered fine particles (powder) are mixed. Therefore, since the fine particles may adversely affect the flame holder (for example, wear or blockage due to the fine particles), the flame holder is not attached. However, as described above, in the combustion burner 34 for gas fuel, a flow rate difference is set between the flow rate of the gas fuel and the flow rate of the air, thereby promoting the mixing of the gas fuel and the air. Therefore, stable combustion can be ensured without a flame holder.

  Thus, in the boiler equipment of Example 1, the gasification furnace 10 which produces | generates gas fuel by burning and gasifying biomass as a fuel, the gas fuel and fossil fuel produced | generated by the gasification furnace 10 are used. A boiler 30 for recovering heat generated by combustion; a boiler body 31 having a hollow shape capable of burning gas fuel and fossil fuel; and a boiler body 31 provided along the circumferential direction. A plurality of fossil fuel combustion burners 33 that form a flame of a predetermined form by injecting fossil fuel and air, and provided in the boiler body 31 along the circumferential direction below the fossil fuel combustion burner 33. A plurality of combustion burners 34 for gas fuel are provided for injecting gas fuel and air toward the flame formed by the combustion burner 33 for fossil fuel.

  Therefore, the combustion burner 33 for fossil fuel forms a predetermined flame by injecting fossil fuel and air, and the combustion burner 34 for gas fuel is formed by the combustion burner 33 for fossil fuel. Gas fuel and air will be injected toward the flame. Therefore, by properly supplying the gas fuel and the fossil fuel into the boiler body 31, the gas fuel does not cool the flame caused by the fossil fuel or obstruct the form thereof. Generation of harmful substances can be suppressed, and stable combustion in the boiler 30 can be achieved.

  In this case, the combustion burner 33 for each fossil fuel can form a flame that swirls about the center position along the vertical direction of the boiler body 31 as an axis, and the combustion burner 34 for each gas fuel Gas fuel and air are injected in the tangential direction to the flame in a swirling form. Accordingly, the gas fuel combustion burner 34 injects the gas fuel and the air in the tangential direction of the swirl flame formed by the fossil fuel combustion burner 33, so that the gas fuel inhibits the swirl flow of the fossil fuel flame. There is nothing, and stable combustion can be made possible.

  Moreover, in the boiler equipment of Example 1, the boiler main body 31 is made into a rectangular cross-sectional shape, and the combustion burner 33 for each fossil fuel and the combustion burner 34 for several gas fuels are arrange | positioned in the wall part of the boiler main body 31. FIG. Therefore, the combustion burner 33 for fossil fuel and the combustion burner 34 for gas fuel can stably supply fuel and air into the boiler body 31.

  In the boiler facility of the first embodiment, the combustion burners 33 for fossil fuels and the combustion burners 34 for gas fuels respectively inject fuel and air toward the flame in the boiler body 31 in the same direction. Yes. Therefore, stable combustion can be ensured by appropriately mixing fossil fuel, gas fuel, and air.

  Further, in the boiler facility of the first embodiment, the combustion burner 34 for gas fuel has a gas fuel passage 73 and an air passage 74 formed inside and outside by the outer cylinder 72 being positioned outside the inner cylinder 71, and the tip The gas fuel passage 73 and the air passage 74 are joined to each other to form an injection port 77 for injecting gas fuel and air. Therefore, stable combustion can be ensured by appropriately mixing and injecting the gas fuel and air.

  Further, in the boiler facility of the first embodiment, in the combustion burner 34 for gas fuel, a predetermined flow velocity difference between the flow velocity of the gas fuel flowing in the gas fuel passage 73 and the flow velocity of air flowing in the air passage 74 is obtained. Is set. Therefore, since the flow rate of the gas fuel is different from the flow rate of the air, the gas fuel and the air are appropriately mixed, and the mixing of both can be promoted to enable stable combustion.

  FIG. 5 is a layout diagram of a combustion burner for fossil fuel in a conventional boiler constituting a boiler facility according to a second embodiment of the present invention, and FIG. 6 is a combustion burner for gas fuel in a conventional boiler constituting the boiler facility of the second embodiment. FIG. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

  In the boiler of the boiler facility of the second embodiment, as shown in FIGS. 5 and 6, as a combustion device, a plurality of combustion burners 33 for fossil fuels and a plurality of combustion burners 34 for gas fuels are provided at the lower portion of the boiler body 31. And are provided. Four combustion burners 33 for fossil fuel are arranged along the circumferential direction at the corners of the boiler body 31, and are arranged in multiple stages in the vertical direction. In this case, the combustion burner 33 for each fossil fuel can form a flame of a predetermined form in the boiler body 31 by injecting fossil fuel and air. Specifically, the combustion burner 33 for each fossil fuel can form a flame that swirls around the center position along the vertical direction of the boiler body 31 as an axis.

  On the other hand, four combustion burners 34 for gas fuel are arranged at the corners of the boiler body 31 along the circumferential direction. In this case, the combustion burner 34 for each gas fuel can inject gas fuel and air toward the flame formed by the combustion burner 33 for each fossil fuel. Specifically, the combustion burner 34 for each gas fuel has a combustion flame burner 33 for fossil fuel, with respect to a swirling flame that swirls around the center position along the vertical direction in the boiler body 31 as an axis. Gas fuel and air can be injected in the tangential direction.

  The combustion burner 33 for fossil fuel and the combustion burner 34 for gas fuel have substantially the same configuration, and have substantially the same arrangement configuration, and a plurality of combustion burners 33 for fossil fuel and a plurality of combustion burners for gas fuel are used. After the swirl flame is formed in the boiler body 31, the combustion burner 34 injects fossil fuel and air, gas fuel and air in the same direction toward the swirl flame, respectively. In this case, the combustion burner 33 for each fossil fuel and the combustion burner 34 for each gas fuel inject fossil fuel and air, gas fuel and air toward the tangential direction of the swirling flame generated in the boiler body 31. However, since the combustion burner 34 for gas fuel is positioned below the combustion burner 33 for fossil fuel, the gas fuel and the combustion fuel burner 34 for the fossil fuel are directed upward with respect to the swirling flame formed by the combustion burner 33 for fossil fuel. Air will be injected.

  As described above, in the boiler facility according to the second embodiment, the combustion for a plurality of fossil fuels that forms a predetermined form of flame by injecting the fossil fuel and air along the circumferential direction to the corners of the boiler body 31. A burner 33 is provided, and gas fuel and air are injected below the fossil fuel combustion burner 33 toward the flame formed by the fossil fuel combustion burner 33 along the circumferential direction at the corners of the boiler body 31. A plurality of combustion burners 34 for gas fuel are provided.

  Therefore, the combustion burner 33 for fossil fuel forms a swirl flame by injecting fossil fuel and air, and the combustion burner 34 for gas fuel forms a swirl flame formed by the combustion burner 33 for fossil fuel. Gas fuel and air will be injected toward the tangential direction. Therefore, by properly supplying the gas fuel and the fossil fuel into the boiler body 31, the gas fuel does not cool the flame caused by the fossil fuel or obstruct the form thereof. Generation of harmful substances can be suppressed, and stable combustion in the boiler 30 can be achieved.

  Moreover, in the boiler equipment of Example 2, the boiler main body 31 is made into a rectangular cross-sectional shape, and the combustion burner 33 for each fossil fuel and the combustion burner 34 for several gas fuels are arrange | positioned at the corner | angular part of a boiler main body. Therefore, the combustion burner 33 for fossil fuel and the combustion burner 34 for gas fuel can stably supply fuel and air into the boiler body 31.

  In each of the embodiments described above, the combustion body burner 33 for fossil fuel is disposed above and the combustion burner 34 for gas fuel is disposed below in the boiler body 31 of the boiler 30, but combustion for fossil fuel is performed. The arrangement relationship between the burner 33 and the combustion burner 34 for gas fuel is not limited to this arrangement. For example, in the boiler body 31 of the boiler 30, the combustion burner 33 for fossil fuel is disposed below, the combustion burner 34 for gas fuel is disposed above, or the combustion burner 33 for fossil fuel is vertically arranged in multiple stages. Alternatively, a gas fuel combustion burner 34 may be disposed between the multi-stage fossil fuel combustion burners 33.

  Further, in each of the above-described embodiments, the combustion burner 33 for each fossil fuel forms a swirling flame, and the combustion burner 34 for each gas fuel injects gas fuel and air in the tangential direction with respect to the swirling flame. However, the fuel and air injection modes by the combustion burners 33 and 34 are not limited to these. For example, in the boiler body 31 of the boiler 30, when a plurality of combustion burners 33 for fossil fuels are arranged to face each other and a flame is formed so that the injection of fossil fuel and air collides, a plurality of gases Similarly, the combustion burner 34 for fuel is disposed oppositely so that the injection of gas fuel and air collides with each other and is injected toward the fire formed by the combustion burner 33 for each fossil fuel. That's fine.

  The boiler equipment according to the present invention is harmful by properly supplying gas fuel and fossil fuel into the boiler body by injecting gas fuel toward the flame formed by the injection for fossil fuel. It suppresses the generation of substances and enables stable combustion, and can be applied to any boiler equipment.

DESCRIPTION OF SYMBOLS 10 Gasification furnace 11 Gasification furnace main body 12 Hopper 15 Supply piping 16 Drying device 17 Cyclone 21 Air supply piping 24 Gas fuel piping 25 Dust removal device 26 Cyclone 30 Boiler 31 Boiler main body 32 Combustion device 33 Combustion burner 34 for fossil fuel 34 Gas fuel Combustion burner 39 Air supply pipe 42 Flue 51 Air heater 52 Dust remover 53 Blower

Claims (6)

A gasification furnace that generates gas fuel by burning and gasifying biomass as fuel;
A boiler that recovers heat generated by burning the gas fuel and fossil fuel generated in the gasifier;
With
The boiler is
A boiler body having a hollow shape capable of burning gas fuel and fossil fuel;
A plurality of fossil fuel combustion burners that are provided along the circumferential direction of the boiler body and inject a fossil fuel and air to form a flame of a predetermined form;
A plurality of gas fuels that are provided in the boiler main body in the circumferential direction above or below the fossil fuel combustion burner and inject gas fuel and air toward the flame formed by the fossil fuel combustion burner A combustion burner for
Having
Boiler equipment characterized by that.   The plurality of fossil fuel combustion burners can form a flame that swirls around a central position along a vertical direction of the boiler body as an axis, and the plurality of gas fuel combustion burners The boiler equipment according to claim 1, wherein gas fuel and air are injected in a tangential direction with respect to a flame in a form to perform.   The boiler body has a rectangular cross-sectional shape, and the plurality of fossil fuel combustion burners and the plurality of gas fuel combustion burners are disposed on a wall portion or a corner portion of the boiler body. The boiler equipment according to claim 1 or 2.   2. The combustion burner for the plurality of fossil fuels and the combustion burner for the plurality of gas fuels respectively inject fuel and air in the same direction toward the flame in the boiler body. Boiler equipment.   In the combustion burner for gas fuel, the outer cylinder is located outside the inner cylinder, so that a gas fuel passage and an air passage are formed inside and outside, and the gas fuel passage and the air passage merge at the tip. The boiler equipment according to any one of claims 1 to 4, wherein an injection port for injecting gas fuel and air is formed. The gas fuel combustion burner sets a predetermined flow rate difference between a flow rate of the gas fuel flowing in the gas fuel passage and a flow rate of air flowing in the air passage. 5. The boiler equipment according to 5.

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