JP5812575B2 - Boiler equipment - Google Patents

Description

The present invention, a fossil fuel such as gas fuels and coal or oil produced using the biomass is burned in combination as a fuel, it relates capable boiler facilities to recover the heat generated by this 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 facilities that combine such a gasification furnace and boiler, the gasification furnace supplies high-temperature air together with the biomass to combust and gasify the biomass, and the generated combustible gas is taken out as fuel gas. ing. Generally, high-temperature air is supplied from the lower part of the gasification furnace, and the combustion gas rises. Therefore, the air ratio is different in the gasification furnace, and the reaction rate of biomass is different. Therefore, there is a problem that the reaction rate of biomass varies at different positions in the gasification furnace, and the gasification rate of biomass is reduced. In addition, there are various types of biomass (for example, type, size, shape, moisture content, etc.), and since the optimum air ratio is different, the reaction rate in the gasification furnace is different. For this reason, when biomass in different states is charged into the gasification furnace, there is a problem that the reaction rate in the gasification furnace fluctuates and the biomass gasification rate decreases.

  This invention solves the subject mentioned above, and while providing the gasification rate, while improving the production | generation efficiency of fuel gas, it provides the boiler equipment which enables the improvement of heat recovery efficiency. Objective.

In order to achieve the above object, the boiler equipment of the present invention includes a circulating fluidized bed type gasification furnace that generates gas fuel by burning and gasifying biomass as fuel, and gas generated in the gasification furnace. A boiler that recovers heat generated by burning fuel and fossil fuel, and the gasification furnace has a hollow gasification furnace main body, and a fuel supply capable of supplying biomass into the gasification furnace main body And a plurality of air supply systems capable of supplying gasification air into the gasification furnace main body, and flow rate adjusting valves respectively provided in the plurality of air supply systems, and supplied to the gasification furnace main body The air supply amount of the plurality of air supply systems is increased or decreased by the flow rate adjusting valve according to the reaction rate of the biomass to be produced .

Accordingly, in a circulating fluidized bed type gasification furnace, air is supplied from a plurality of locations to the gasification furnace main body, so that the inside of the gasification furnace main body can be made to have a uniform air ratio. The gasification rate can be improved by increasing the reaction rate in the furnace, and as a result, the generation efficiency of fuel gas can be improved. As a result, the heat recovery efficiency can be improved in the boiler. .

In the boiler facility according to the present invention, the plurality of air supply systems are provided above a first air supply system capable of supplying air to a lower portion of the gasification furnace main body and the first air supply system in the gasification furnace main body. And a second air supply system capable of supplying air.

  Therefore, the first air supply system and the second air supply system have different air supply positions with respect to the gasification furnace main body so as to correspond to the combustion / gasification state and biomass state in the gasification furnace main body. The air supply position to the gasifier main body can be changed, and the reaction rate in the gasifier can be increased by burning and gasifying at an optimal air ratio adapted to the condition in the gasifier main body. The gasification rate can be improved easily.

In the boiler equipment according to the present invention, the second air supply system supplies air to an intermediate position in a vertical direction in the gasification furnace main body.

  Therefore, the air from the second air supply system is supplied to the intermediate position of the gasification furnace main body having a low reaction rate, and the biomass can be appropriately combusted and gasified over the entire region of the gasification furnace main body. The gasification rate can be improved by increasing the reaction rate in the gasification furnace.

In the boiler equipment according to the present invention, the second air supply system supplies a gasification accelerator to the gasification furnace main body.

  Therefore, the gasification promoter from the second air supply system is supplied into the gasification furnace main body having a low reaction rate, and the biomass can be combusted and gasified appropriately over the entire region of the gasification furnace main body. The gasification rate can be improved by increasing the reaction rate in the gasification furnace.

  In the boiler equipment of the present invention, the plurality of air supply systems supply a part of combustion air supplied to the boiler into the gasifier.

  Therefore, a part of the combustion air supplied to the boiler is supplied into the gasification furnace by the air supply system, and there is no need to separately provide an air supply system or heating means, thereby simplifying the configuration. Equipment costs can be reduced and high-quality gas fuel can be produced.

  In the boiler facility of the present invention, one of the plurality of air supply systems supplies a part of the exhaust gas discharged from the boiler into the gasifier.

  Therefore, a part of the exhaust gas discharged from the boiler is supplied into the gasification furnace by the air supply system, and gasification can be promoted by the exhaust gas without providing a separate supply system. High gas fuel can be generated.

According to boiler facility of the present invention, since the air gasification providing a plurality of air supply system that can supply, air is supplied from a plurality of locations with respect to the gasification furnace body into gasifier unit Thus, the inside of the gasification furnace main body can be made to have a uniform air ratio, the reaction rate in the gasification furnace can be increased and the gasification rate can be improved, and as a result, the generation efficiency of fuel gas is improved. As a result, the heat recovery efficiency can be improved.

FIG. 1 is a schematic configuration diagram illustrating a boiler facility according to a first embodiment of the present invention. FIG. 2 is a schematic configuration diagram illustrating boiler equipment according to the second embodiment of the present invention. FIG. 3 is a schematic configuration diagram illustrating boiler equipment according to the third embodiment of the present invention.

With reference to the accompanying drawings, illustrating preferred embodiments of the engagement Rubo Ira equipment present invention in detail. 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.

  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 recycled fuel (pellets and chips) with reduced amounts thereof 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 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.

  A plurality (two in this embodiment) of air supply systems for supplying combustion air to the gasifier main body 11 are provided. That is, an air supply pipe 21 is provided as an air supply system, and the air supply pipe 21 has a tip portion branched into two, a first air supply pipe 61 as a first fuel supply system, and a second fuel. A second air supply pipe 62 is provided as a supply system. The front end of the first air supply pipe 61 is connected to the lower portion of the gasifier main body 11, and the air supply branch pipe 22 branched from the first air supply pipe 21 is connected to the seal pod 20. . In addition, the second air supply pipe 62 is connected at a tip portion above the first air supply pipe 61 in the gasification furnace main body 11, that is, in a vertical intermediate position in the gasification furnace main body 11. 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 and the middle part of the gasification furnace main body 11, and the air supply branch pipe 22 can seal pods. 20 can be supplied.

  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. The gasification furnace main body 11 is supplied with combustion high-temperature air from the lower part through the first air supply pipe 61 and is supplied with combustion hot air from the lower part through the second air supply pipe 62. 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 the 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.

  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 (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 gasification furnace 10 of the boiler equipment of the present embodiment configured as described above, as described above, the first and second air supply systems 61 capable of supplying combustion / gasification air to the gasification furnace main body 11, 62 is provided, the first air supply pipe 61 can supply air to the lower part of the gasification furnace main body 11, and the second air supply pipe 62 supplies air to the middle part in the vertical direction of the gasification furnace main body 11. It can be supplied. In addition, a fuel supply system (such as a hopper 12, a screw feeder 13, a conveyor 14, and a supply pipe 15) that supplies biomass to the gasifier main body 11 is provided, and biomass can be supplied to the gasifier main body 11.

  That is, the gasification furnace main body 11 is supplied with biomass and air for combustion / gasification together with fluidized sand, so that the biomass burns, and the generated combustible gas such as carbon monoxide rises. It is discharged from a gas fuel pipe 24 provided in. In this case, the generated gas rises, and the gas ratio of the gasification furnace main body 11 varies between the upper side and the lower side of the gasification furnace main body 11. In the gasification furnace main body 11, in order to burn biomass and gasify efficiently, it is considered that it is optimal to set the air ratio in the range of 0.3 to 0.7.

  Therefore, in the first embodiment, air is supplied to the lower part of the gasifier main body 11 through the first air supply pipe 61, and air is supplied to the intermediate portion (upper part) of the gasifier main body 11 through the second air supply pipe 62. Is adjusted so that the air ratio is uniform from the upper side to the lower side of the gasification furnace main body 11. Therefore, the gasification furnace main body 11 is supplied not only from the lower part but also from the middle part (upper part), and is adjusted so that the inside has a uniform air ratio. The reaction rate can be increased by homogenizing and appropriately burning and gasifying the biomass.

  Moreover, you may adjust the air quantity supplied to the lower part and intermediate part of the gasification furnace main body 11 by providing a flow regulating valve in the 1st air supply piping 61 and the 2nd air supply piping 62. FIG. That is, the air supply amount from the first air supply pipe 61 and the air supply amount from the second air supply pipe 62 may be increased or decreased by the flow rate adjustment valve according to the combustion state in the gasification furnace main body 11.

  In this case, the biomass burned in the gasification furnace main body 11 includes those that are easily gasified and those that are difficult to gasify. For example, those having a low water content, such as wood chips, wheat straw, pellets, and coal, have a high reaction rate, and those having a high water content, such as thinned wood, sludge, and driftwood, have a low reaction rate. Therefore, the air supply amount from the first air supply pipe 61 and the air supply amount from the second air supply pipe 62 are increased or decreased by the flow rate adjustment valve according to the reaction rate of the biomass supplied to the gasifier main body 11. May be.

  Therefore, in the gasification furnace main body 11 of the gasification furnace 10, air is supplied from the first air supply pipe 61 to the lower part of the gasification furnace main body 11, and the gasification furnace main body 11 is supplied from the second air supply pipe 62. Air is supplied to the intermediate part. Further, biomass is supplied from the fuel supply system into the gasifier main body 11.

  Then, the gasifier main body 11 rises by generating combustible gas containing carbon monoxide and hydrogen generated by a gasification reaction using carbon dioxide generated by combustion of biomass at the lower part as a gasifying agent. The air is supplied not only from the lower part but also from the middle part, so that the air ratio is uniform over the entire region, and biomass is appropriately gasified even in the upper part. The combustible gas generated by the gasification is separated from the fluid sand by the cyclone 17 and supplied to the boiler 30 through the gas fuel pipe 24 as gas fuel.

  As described above, in the gasification furnace according to the first embodiment, a fuel supply system capable of supplying biomass into the gasification furnace main body 11 and the gasification furnace main body with respect to the gasification furnace main body 11 having a hollow shape. 11, first and second air supply pipes 61 and 62 (air supply pipes 21) are provided as a plurality of air supply systems capable of supplying gasification air.

  Therefore, by providing the first and second air supply pipes 61 and 62 capable of supplying air into the gasifier main body 11, air is supplied to the gasifier main body 11 from a plurality of locations. The gasification furnace body 11 can be made to have a uniform air ratio, the reaction rate in the gasification furnace 10 can be increased, and the gasification rate can be improved. As a result, the production efficiency of fuel gas is improved. can do. In the gasifier main body 11, air is supplied from the first and second air supply pipes 61 and 62 to the biomass in various states in the gasifier main body 11, It can be adjusted to an optimal air ratio according to the state of biomass, and the reaction rate in the gasification furnace 10 can be increased to improve the gasification rate.

  Further, in the gasification furnace of the first embodiment, the first air supply pipe 61 can supply air to the lower part of the gasification furnace main body 11, and the second air supply pipe 62 is the first air supply pipe in the gasification furnace main body 11. Air can be supplied above the air supply pipe 61. Therefore, the first air supply pipe 61 and the second air supply pipe 62 are different in the supply position of air to the gasifier main body 11 up and down, so that the gasification state and biomass state in the gasifier main body can be achieved. Accordingly, the supply position of air to the gasification furnace main body 11 can be changed, and the reaction in the gasification furnace 10 is performed by combustion and gasification at an optimal air ratio adapted to the gasification state of the gasification furnace main body 11. The speed can be increased and the gasification rate can be easily improved.

  In the gasification furnace of the first embodiment, the second air supply pipe 62 supplies air to an intermediate position in the vertical direction in the gasification furnace main body 11. Accordingly, the air from the second air supply pipe 62 is supplied to the intermediate position of the gasification furnace main body 11 having a low reaction rate, and the biomass is appropriately combusted and gasified over the entire region of the gasification furnace main body 11. It is possible to increase the reaction rate in the gasification furnace 10 and improve the gasification rate.

  In the boiler facility of the first embodiment, the gasification furnace 10 that generates gas fuel by burning and gasifying biomass as fuel, and the gas fuel and fossil fuel generated in the gasification furnace 10 are combusted. A boiler 30 for recovering the generated heat is provided, and as the gasification furnace 10, a fuel supply system capable of supplying biomass into the gasification furnace body 11, and a gas, First and second air supply pipes 61 and 62 (air supply pipes 21) as a plurality of air supply systems capable of supplying gasification air are provided in the gasification furnace main body 11.

  Therefore, in the gasification furnace 10, air is supplied to the gasification furnace main body 11 from a plurality of locations, so that the inside of the gasification furnace main body 11 can be made to have a uniform air ratio. The gasification rate can be improved by increasing the reaction rate in the interior, and as a result, the production efficiency of the fuel gas can be improved. As a result, the heat recovery efficiency can be improved in the boiler. In the gasifier main body 11, air is supplied from the first and second air supply pipes 61 and 62 to the biomass in various states in the gasifier main body 11, It can be adjusted to an optimal air ratio according to the state of biomass, and the reaction rate in the gasification furnace 10 can be increased to improve the gasification rate.

  In this case, the first and second air supply pipes 61 and 62 supply part of the combustion air supplied to the boiler 30 to the gasifier main body 11. Therefore, a part of the combustion air supplied to the boiler 30 is supplied into the gasification furnace 10 through the air supply pipe 21, and it is not necessary to provide an air supply system or heating means separately, and the configuration is simplified. By doing so, it is possible to reduce equipment costs and to produce high quality gas fuel.

  FIG. 2 is a schematic configuration diagram illustrating boiler equipment according to the second embodiment of the present invention. 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 facility of the second embodiment, as shown in FIG. 2, an air supply pipe 71 is provided as an air supply system capable of supplying gasification air to the gasification furnace main body 11 of the gasification furnace 10. The supply pipe 71 is provided with a blower 72 at the base end and a heat exchanger 73 for exchanging heat with the gas fuel pipe 24 at an intermediate part. In addition, the air supply pipe 71 is branched into two ends, and a first air supply pipe 74 as a first fuel supply system and a second air supply pipe 75 as a second fuel supply system are provided. One air supply pipe 74 is connected to the lower portion of the gasification furnace main body 11 at the tip, and an air supply branch pipe 76 branched from the first air supply pipe 74 is connected to the seal pod 20. In addition, the second air supply pipe 75 is connected at a tip portion above the first air supply pipe 74 in the gasifier main body 11, that is, in a vertical intermediate position in the gasifier main body 11.

  Therefore, when external air is drawn into the air supply pipe 71 by the blower 72 in the gasification furnace main body 11 of the gasification furnace 10, this air is combined with the gas fuel flowing through the gas fuel pipe 24 by the heat exchanger 73. Heat exchange between the two. Here, the air flowing through the air supply pipe 71 is desirably heated to 200 to 350 ° C. And the air heated here is supplied to the lower part of the gasification furnace main body 11 from the 1st air supply piping 74, and is supplied to the intermediate part of the gasification furnace main body 11 from the 2nd air supply piping 75. FIG. Further, biomass is supplied from the fuel supply system into the gasifier main body 11.

  Then, the gasifier main body 11 rises by generating combustible gas containing carbon monoxide and hydrogen generated by a gasification reaction using carbon dioxide generated by combustion of biomass at the lower part as a gasifying agent. The air is supplied not only from the lower part but also from the middle part, so that the air ratio is uniform over the entire region, and biomass is appropriately gasified even in the upper part. The combustible gas generated by the gasification is separated from the fluid sand by the cyclone 17 and supplied to the boiler 30 through the gas fuel pipe 24 as gas fuel.

  As described above, in the gasification furnace according to the second embodiment, a fuel supply system capable of supplying biomass into the gasification furnace main body 11 and the gasification furnace main body with respect to the gasification furnace main body 11 having a hollow shape. 11, a plurality of first and second air supply pipes 74 and 75 (air supply pipes 71) serving as a plurality of air supply systems capable of supplying gasification air are provided.

  Accordingly, air is supplied to the gasification furnace main body 11 from a plurality of locations, the inside of the gasification furnace main body 11 can be made to have a uniform air ratio, and the reaction rate in the gasification furnace 10 is increased. Thus, the gasification rate can be improved. In this case, the external air is heated by the heat exchanger 73 and then supplied to the lower part and the middle part of the gasifier main body 11 by the first and second air supply pipes 74 and 75, and is independent of the gasifier 10. Thus, the amount of air supplied to the lower part or the middle part of the gasification furnace main body 11 can be controlled regardless of the operation of the boiler 30.

  Even in the present embodiment, the amount of air supplied to the lower part and the middle part of the gasification furnace main body 11 is adjusted by providing flow control valves in the first air supply pipe 74 and the second air supply pipe 75. be able to. Further, a dust collector may be provided in the air supply pipe 71.

  FIG. 3 is a schematic configuration diagram illustrating boiler equipment according to the third embodiment of the present invention. 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 facility of the third embodiment, as shown in FIG. 3, an air supply pipe 21 is provided as an air supply system capable of supplying gasification air to the gasification furnace main body 11 of the gasification furnace 10. The supply pipe 21 is connected at its base end to an air supply pipe 39 that supplies combustion air to the boiler 30. In addition, the air supply pipe 21 is branched into two ends, and a first air supply pipe 61 and a second air supply pipe 62 are provided. The first air supply pipe 61 has a tip end portion of the gasifier main body 11. The second air supply pipe 62 that is connected to the lower part of the second air supply pipe 62 is connected to the middle part of the gasifier main body 11 at the tip.

  An exhaust gas supply pipe 81 is provided as a second air supply system capable of supplying boiler exhaust gas containing carbon dioxide as a gasification accelerator to the gasification furnace body 11 of the gasification furnace 10. 82 is attached. The exhaust gas supply pipe 81 has a base end connected between the selective reduction catalyst 54 and the air heater 51 in the exhaust gas pipe 50 from the boiler 30. Further, the exhaust gas supply pipe 81 is connected at a tip portion above the second air supply pipe 62 in the gasification furnace main body 11.

  Therefore, in the gasification furnace main body 11 of the gasification furnace 10, high-temperature air in the air supply pipe 39 passes through the air supply pipe 21 and is supplied from the first air supply pipe 61 to the lower portion of the gasification furnace main body 11. The gas is supplied from the second air supply pipe 62 to the intermediate portion of the gasifier main body 11. Further, the exhaust gas in the exhaust gas pipe 50 is supplied from the exhaust gas supply pipe 81 to the intermediate portion of the gasifier main body 11. Further, biomass is supplied from the fuel supply system into the gasifier main body 11.

  Then, the gasifier main body 11 rises by generating combustible gas containing carbon monoxide and hydrogen generated by a gasification reaction using carbon dioxide generated by combustion of biomass at the lower part as a gasifying agent. The air is supplied not only from the lower part but also from the middle part, so that the air ratio is uniform over the entire region, and biomass is appropriately gasified even in the upper part. Moreover, the gasification of biomass is accelerated | stimulated by supplying the waste gas containing a carbon dioxide to the intermediate part of the gasification furnace main body 11. FIG. The combustible gas generated by the gasification is separated from the fluid sand by the cyclone 17 and supplied to the boiler 30 through the gas fuel pipe 24 as gas fuel.

  As described above, in the gasification furnace according to the third embodiment, a fuel supply system capable of supplying biomass into the gasification furnace main body 11 and the gasification furnace main body with respect to the gasification furnace main body 11 having a hollow shape. 11 includes first and second air supply pipes 61 and 62 (air supply pipes 21) as a plurality of air supply systems capable of supplying gasification air, and a gasifier main body as a second air supply system. 11 is provided with an exhaust gas supply pipe 81 capable of supplying exhaust gas.

  Accordingly, air is supplied to the gasification furnace main body 11 from a plurality of locations, the inside of the gasification furnace main body 11 can be made to have a uniform air ratio, and the reaction rate in the gasification furnace 10 is increased. Thus, the gasification rate can be improved. In addition, the exhaust gas as the gasification accelerator is supplied to the gasification furnace main body 11 separately from the air, and the reaction rate in the gasification furnace 10 can be further increased to improve the gasification rate.

  In the present embodiment, the exhaust gas amount supplied to the gasifier main body 11 can be adjusted by providing the exhaust gas supply pipe 81 with a flow rate adjustment valve. Further, only the first air supply pipe 61 or the second air supply pipe 62 may be used as the air supply system, and the exhaust gas supply pipe 81 may be provided as the second air supply system. Furthermore, although the exhaust gas supply pipe 81 is provided as the second air supply system, a route for supplying carbon dioxide and a route for supplying water vapor may be provided separately.

  In the above-described embodiment, the first and second air supply systems 61, 62, 74, and 75 are provided as a plurality of fuel supply systems that can supply air into the gasifier main body 11 as the gasifier main body. However, three or more air supply systems may be provided.

Engaging Rubo Ira equipment present invention, by providing a plurality of air supply system capable of supplying air gasification in the gasification furnace body, an improvement in production efficiency of the fuel gas by improving the gasification efficiency It is possible to improve the heat recovery efficiency and can be applied to any gasification furnace and boiler equipment.

10 Gasifier 11 Gasifier Body 12a, 12b Hopper (Fuel Supply System)
15a, 15b Supply piping (fuel supply system)
16a, 16b Drying device 17 Cyclone 21 Air supply pipe (air supply system)
24 Gas fuel piping 25 Dust removal device 26 Cyclone 30 Boiler 31 Boiler body 32 Combustion device 33 Combustion burner for fossil fuel 34 Combustion burner for gas fuel 39 Air supply piping 42 Flue 51 Air heater 52 Dust removal device 53 Blower 61, 74 1st Air supply piping (first fuel supply system)
62,75 Second air supply pipe (second fuel supply system)
81 Exhaust gas supply pipe (second air supply system)

Claims (6)

  A circulating fluidized bed type 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 gasifier is
  A gasification furnace body having a hollow shape;
  A fuel supply system capable of supplying biomass into the gasifier body;
  A plurality of air supply systems capable of supplying gasification air into the gasification furnace body;
  A flow rate adjusting valve provided in each of a plurality of air supply systems;
  Have
  Increasing or decreasing the air supply amount of the plurality of air supply systems by the flow rate adjusting valve according to the reaction rate of biomass supplied to the gasifier main body,
  Boiler equipment characterized by that. The plurality of air supply systems include a first air supply system capable of supplying air to a lower portion of the gasification furnace main body, and a second air supply capable of supplying air above the first air supply system in the gasification furnace main body. The boiler equipment according to claim 1, further comprising an air supply system. The boiler equipment according to claim 2, wherein the second air supply system supplies air to an intermediate position in a vertical direction in the gasification furnace main body. The boiler equipment according to claim 2 or 3, wherein the second air supply system supplies a gasification accelerator to the gasification furnace main body. The boiler equipment according to any one of claims 1 to 4, wherein the plurality of air supply systems supply a part of combustion air supplied to the boiler into the gasification furnace. 5. The apparatus according to claim 1 , wherein one of the plurality of air supply systems supplies a part of the exhaust gas discharged from the boiler into the gasification furnace. Boiler equipment.

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