JP5595089B2 - Gasifier and boiler equipment - Google Patents

Description

  The present invention is a gasification furnace that burns and gasifies biomass to generate gas fuel, and uses gas fuel generated using biomass and fossil fuels such as coal and oil as fuels for combustion, and is generated by this combustion. The present invention relates to a boiler facility capable of recovering the generated heat.

  Various gasification furnaces have been proposed in which carbon monoxide, hydrogen, and the like are generated by burning biomass gas into fuel and generating it 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. In this case, the biomass is fed into the gasifier from one fuel supply system. However, there are biomass in various states (for example, type, size, shape, moisture content, etc.), and the optimum air ratio is different, so that the reaction rates in the gasification furnace are different. For this reason, when biomass in different states is introduced into the gasification furnace at once, 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.

  The gasification furnace of the present invention for achieving the above object is a gasification furnace that generates gas fuel by burning and gasifying biomass as fuel, the gasification furnace main body having a hollow shape, A plurality of fuel supply systems capable of supplying biomass into the gasification furnace main body, and an air supply system capable of supplying combustion / gasification air into the gasification furnace main body. .

  Therefore, by providing a plurality of fuel supply systems capable of supplying biomass in the gasifier main body, biomass in different states is supplied from different fuel supply systems to the position of the optimum air ratio in the gasifier main body. It is possible to improve the gasification rate by increasing the reaction rate in the gasification furnace, and as a result, the generation efficiency of the fuel gas can be improved.

  In the gasification furnace of the present invention, the plurality of fuel supply systems include a first fuel supply system capable of supplying biomass to a lower portion of the gasification furnace main body, and an upper side of the first fuel supply system in the gasification furnace main body. And a second fuel supply system capable of supplying biomass.

  Therefore, the biomass supply position with respect to the gasifier main body is changed according to the state of the biomass by changing the biomass supply position with respect to the gasifier main body vertically in the first fuel supply system and the second fuel supply system. It is possible to increase the reaction rate in the gasification furnace by burning the biomass at the position of the optimum air ratio adapted to the state, and to easily improve the gasification rate.

  In the gasification furnace of the present invention, the first fuel supply system supplies biomass having a lower reaction rate than biomass supplied from the second fuel supply system.

  Accordingly, by supplying biomass with a low reaction rate to the lower part of the gasifier main body from the first fuel supply system, biomass with a low reaction rate is properly combusted and gasified in a region with a high air ratio. The gasification rate can be improved by increasing the reaction rate in the gasification furnace.

  In the gasifier according to the present invention, the second fuel supply system supplies biomass to an intermediate position in a vertical direction in the gasifier main body.

  Therefore, by supplying biomass with a low reaction rate to the intermediate position of the gasification furnace main body from the second fuel supply system, biomass with a high reaction rate is properly combusted and gasified even in a region with a low air ratio. It is possible to improve the gasification rate by increasing the reaction rate in the gasification furnace.

  In the gasification furnace of the present invention, the air supply system supplies gasified air in the vicinity of a supply position where biomass is supplied by the first fuel supply system in the gasification furnace main body. .

  Therefore, the vicinity of the supply position where the biomass is supplied from the first fuel supply system in the gasifier main body can be set as the high air ratio region, and the biomass having a low reaction rate is appropriately combusted and gasified in the high air ratio region. Can be

  In addition, the boiler equipment of the present invention includes 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. A gasification furnace body having a hollow shape, a plurality of fuel supply systems capable of supplying biomass into the gasification furnace body, and an interior of the gasification furnace body And an air supply system capable of supplying combustion / gasification air.

  Therefore, in the gasifier, biomass in different states can be supplied from different fuel supply systems to the position of the optimal air ratio in the gasifier main body, and the reaction rate in the gasifier can be increased to increase the gas. The conversion rate can be improved, the fuel gas production efficiency can be improved, and 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 fuel supply systems may include a first fuel supply system capable of supplying biomass to a lower portion of the gasification furnace main body, and an upper side of the first fuel supply system in the gasification furnace main body. A second fuel supply system capable of supplying biomass, wherein the first fuel supply system supplies biomass having a lower reaction rate than biomass supplied from the second fuel supply system.

  Therefore, by supplying biomass with a low reaction rate to the lower part of the gasifier main body from the first fuel supply system, the biomass with a low reaction rate can be properly combusted and gasified in a region with a high air ratio. Thus, the reaction rate in the gasification furnace can be increased, and the gasification rate can be easily improved.

  According to the gasifier and boiler equipment of the present invention, since a plurality of fuel supply systems capable of supplying biomass are provided in the gasifier main body, different states of biomass are supplied from separate fuel supply systems in the gasifier main body. It can be supplied to the position of the optimal air ratio, the reaction rate in the gasification furnace can be increased and the gasification rate can be improved. As a result, the generation efficiency of fuel gas can be improved, It is possible to improve the heat recovery efficiency.

FIG. 1 is a schematic configuration diagram illustrating boiler equipment according to an embodiment of the present invention.

  Exemplary embodiments of a gasification furnace and 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 boiler equipment according to an embodiment of the present invention.

  The boiler equipment of this embodiment is a boiler equipment that can burn gas fuel generated using biomass and fossil fuel such as coal and oil together as fuel and recover the heat generated by this combustion. is there.

  As shown in FIG. 1, the boiler facility of the present embodiment includes a gasification furnace 10 that generates gas fuel by burning and gasifying biomass, and gas fuel and 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 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.

  The gasifier 10 has a plurality (two in this embodiment) of fuel supply systems capable of supplying biomass into the gasifier main body 11. That is, the first fuel supply system 61 capable of supplying biomass to the lower part of the gasifier main body 11 and the second fuel capable of supplying biomass above the biomass supply position of the first fuel supply system 61 in the gasifier main body 11. A supply system 62 is provided. In this case, the second fuel supply system 62 supplies biomass having a high reaction rate, and the first fuel supply system 61 supplies biomass having a reaction rate lower than that of biomass supplied from the second fuel supply system 62. To supply. The second fuel supply system 62 is disposed so as to supply biomass to an intermediate position in the vertical direction of the gasifier main body 11.

  Here, the biomass having a high reaction rate is one having a low water content, such as waste wood, driftwood, grass, waste, pellets, waste paper, waste plastic (resin), coal, etc. Biomass with a low water content is a material with a large amount of water, such as thinned wood, sludge, tires, etc., and is not limited to those presented here. In addition, lignin (woody element) contained in biomass such as wood is originally low in reactivity, and there is a concern that carbonaceous matter may remain in particles at low temperature and low air ratio. It is desirable to discriminate biomass containing a low-reactivity substance into a class with a low reaction rate. Furthermore, the biomass having a high reaction rate includes char scattered and discharged from the gasification furnace main body 11, and this char is collected by a dust removing device 25, a cyclone 26, and an electric dust collector 55 described later. The gasification furnace main body 11 may be supplied again.

  The first fuel supply system 61 includes a hopper 12a, a screw feeder 13a, a conveyor 14a, and a supply pipe 15a. The hopper 12a can store a predetermined amount of biomass, and the screw feeder 13a can supply a predetermined amount of biomass stored in the hopper 12a. The conveyor 14a can convey the biomass supplied from the screw feeder 13a, and removes mixed metal foreign matters such as nails and hinges by a magnetic separator (not shown). And biomass is thrown in into the gasifier main body 11 from the side part through the supply piping 15a. A drying device 16a for removing moisture contained in the biomass is provided above the hopper 12a.

  The second fuel supply system 62 includes a hopper 12b, a screw feeder 13b, a conveyor 14b, and a supply pipe 15b. The hopper 12b can store a predetermined amount of biomass, and the screw feeder 13b can supply a predetermined amount of biomass stored in the hopper 12b. The conveyor 14b can convey the biomass supplied from the screw feeder 13b, and removes mixed metal foreign matters such as nails and hinges by a magnetic separator (not shown). And biomass is thrown in into the gasifier main body 11 from the side part through the supply piping 15b. A drying device 16b that removes moisture contained in the biomass is provided above the hopper 12b.

  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. This air supply system supplies combustion and gasification air to the vicinity of the supply position where biomass is supplied from the first fuel supply system 61 in the gasifier main body 11, that is, to the lower part of the gasifier main body 11. It is possible. 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 dried by the drying devices 16a and 16b in the fuel supply systems 61 and 62, respectively. Then, it is stored in the hoppers 12a and 12b, and is introduced into the gasifier main body 11 from the hoppers 12a and 12b through the supply pipes 15a and 15b by the screw feeders 13a and 13b and the conveyors 14a and 14b. The gasification furnace main body 11 is supplied with high-temperature air for combustion and gasification from the lower part through an 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 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. 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 gasifier 10 of the boiler equipment of the present embodiment configured as described above, as described above, the first and second fuel supply systems 61 and 62 capable of supplying biomass to the gasifier main body 11 are provided, The first fuel supply system 61 can supply biomass having a low reaction rate to the lower part of the gasification furnace main body 11, and the second fuel supply system 62 has a reaction speed at an intermediate portion in the vertical direction of the gasification furnace main body 11. High biomass can be supplied. An air supply pipe 21 is provided as an air supply system for supplying combustion and gasification air to the gasifier main body 11, and the air supply pipe 21 is provided at the lower portion of the gasifier main body 11 for combustion and gasification. Of air can be supplied.

  That is, the gasification furnace main body 11 is supplied with biomass and air for combustion and gasification together with fluidized sand, so that the biomass is combusted and gasified, and the generated combustible gas such as carbon monoxide increases. The gas fuel pipe 24 provided at the upper portion is discharged. In this case, the product gas rises and the combustion air is supplied to the lower part of the gasifier main body 11 by the air supply pipe 21, and the gasifier main body 11 has a high air ratio at the lower part. The upper air ratio is low. In the gasification furnace main body 11, in order to burn biomass efficiently and efficiently gasify, it is thought that it is optimal to set the air ratio in a range of 0.3 to 0.7, but the gasification furnace The air ratio varies above and below the main body 11.

  Therefore, in the present embodiment, the first fuel supply system 61 supplies biomass having a low reaction rate to the lower part of the gasification furnace main body 11 which is a region where the air ratio is high. It is designed to increase the reaction rate by burning and gasifying properly in the high air ratio region. On the other hand, by supplying biomass having a high reaction rate to the middle part (upper part) of the gasification furnace main body 11 which is the region where the air ratio is low by the second fuel supply system 62, even in the region where the air ratio is low, Biomass that has a high reaction rate and is easily gasified is appropriately burned and gasified to increase the reaction rate.

  Therefore, in the gasifier main body 11 of the gasifier 10, biomass having a low reaction rate is supplied from the first fuel supply system 61 to the lower portion of the gasifier main body 11, and the gasifier main body is supplied from the second fuel supply system 62. While biomass having a high reaction rate is supplied to the middle part of 11, high-temperature air for combustion and gasification is supplied to the lower part from the air supply pipe 21.

  Then, in the gasification furnace main body 11, the biomass having a low reaction rate in the high air ratio region is combusted and gasified in the lower part, and a combustible gas containing carbon dioxide is generated and rises. Biomass with a high reaction rate in the air ratio region is combusted and gasified, and combustible gas is generated. In this case, in the gasification furnace main body 11, the combustion / gasification reaction of biomass is accelerated by a high air ratio in the lower part, and carbon dioxide serving as a gas promoter is generated in the upper part. On the other hand, the gasification furnace main body 11 is in an oxygen deficient state with a low air ratio due to carbon dioxide generated at the upper part and the gasification of the biomass is promoted. The combustible gas generated by the combustion and 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.

  Thus, in the gasification furnace of the present embodiment, the first and second fuel supply systems 61 and 62 capable of supplying biomass to the gasification furnace main body 11 having a hollow shape, and combustion / gasification An air supply pipe 21 is provided as an air supply system capable of supplying air.

  Therefore, by providing the first and second fuel supply systems 61 and 62 capable of supplying biomass in the gasifier main body 11, biomass in different states can be supplied from the separate fuel supply systems 61 and 62 to the gasifier main body 11. Can be supplied to the position of the optimal air ratio, the reaction rate in the gasification furnace 10 can be increased, the gasification rate can be improved, and as a result, the production efficiency of gas fuel can be improved. .

  Further, in the gasification furnace of the present embodiment, biomass can be supplied to the lower part of the gasification furnace main body 11 by the first fuel supply system 61, and the first fuel supply system in the gasification furnace main body 11 by the second fuel supply system 62. It is possible to supply biomass above 61. Therefore, the biomass supply position to the gasification furnace main body 11 is made different between the first fuel supply system 61 and the second fuel supply system 62 in the vertical direction, thereby supplying the biomass to the gasification furnace main body 11 according to the state of the biomass. The position can be changed, and the biomass can be burned and gasified at the position of the optimal air ratio adapted to the state to increase the reaction rate in the gasification furnace 10 and easily improve the gasification rate. be able to.

  In the gasification furnace of the present embodiment, the second fuel supply system 62 supplies biomass having a high reaction rate, and the first fuel supply system 61 is supplied from the second fuel supply system 62. We supply biomass that has a lower reaction rate than biomass. Therefore, by supplying biomass having a low reaction rate to the lower portion of the gasification furnace main body 11 from the first fuel supply system 61, the biomass having a low reaction rate is appropriately combusted and gasified in a region having a high air ratio. Thus, the reaction rate in the gasification furnace 10 can be increased and the gasification rate can be improved.

  Moreover, in the gasification furnace of the present embodiment, the second fuel supply system 62 supplies biomass to an intermediate position in the vertical direction in the gasification furnace main body 11. Therefore, by supplying biomass having a low reaction rate to the intermediate position of the gasification furnace main body 11 from the second fuel supply system 62, the biomass having a high reaction rate can be combusted and gas properly even in a region where the air ratio is low. The reaction rate in the gasification furnace 10 can be increased and the gasification rate can be improved.

  In the gasification furnace of the present embodiment, the air supply pipe 21 supplies combustion / gasification air in the vicinity of a supply position where biomass is supplied by the first fuel supply system 61. Therefore, the lower part of the gasification furnace main body 11 can be set as a high air ratio region, and biomass having a low reaction rate can be appropriately combusted and gasified in the high air ratio region.

  Moreover, in the boiler facility of the present 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 first and second fuel supply system 61 capable of supplying biomass to a gasification furnace body 11 having a hollow shape as a gasification furnace 10 provided with a boiler 30 that recovers heat generated by gasification. , 62 and an air supply pipe 21 as an air supply system capable of supplying combustion / gasification air.

  Therefore, in the gasification furnace 10, biomass in different states can be supplied from the separate fuel supply systems 61 and 62 to the position of the optimum air ratio in the gasification furnace main body 11. The gasification rate can be improved by increasing the reaction rate, and the fuel gas generation efficiency can be improved. As a result, the boiler 30 can improve the heat recovery efficiency.

  In the embodiment described above, the first and second fuel supply systems 61 and 62 are provided as the plurality of fuel supply systems capable of supplying biomass into the gasifier main body 11 as the gasifier main body. Three or more supply systems may be provided.

  The gasification furnace and boiler equipment according to the present invention can improve the generation efficiency of fuel gas by improving the gasification rate by providing a plurality of fuel supply systems capable of supplying biomass in the gasification furnace main body. In addition, the heat recovery efficiency can be improved, and can be applied to any gasification furnace and boiler equipment.

10 Gasification furnace 11 Gasification furnace body (Gasification furnace body)
12a, 12b Hopper 15a, 15b Supply piping 16a, 16b Drying device 17 Cyclone 21 Air supply piping (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 Smoke channel 51 Air heater 52 Dust removal device 53 Blower 61 First fuel supply Series 62 Second fuel supply system

Claims (4)

A gasification furnace that generates gas fuel by burning and gasifying biomass as fuel,
A gasification furnace body having a hollow shape;
A plurality of fuel supply systems capable of supplying biomass into the gasifier body;
An air supply system capable of supplying combustion / gasification air into the gasification furnace body;
Bei to give a,
The plurality of fuel supply systems include a first fuel supply system capable of supplying biomass to a lower portion of the gasifier main body, and a second fuel capable of supplying biomass above the first fuel supply system in the gasifier main body. A fuel supply system,
The first fuel supply system is used for supplying biomass having a lower reaction rate than biomass supplied from the second fuel supply system.
A gasification furnace characterized by that. The gasifier according to claim 1 , wherein the second fuel supply system supplies biomass to an intermediate position in a vertical direction in the gasifier main body. The air supply system, at the gasifier unit, to claim 1 or 2, characterized in that supplying the combustion and gasification air in the vicinity of the feed position biomass is supplied by the first fuel supply system The gasifier described. 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 gasifier is
A gasification furnace body having a hollow shape;
A plurality of fuel supply systems capable of supplying biomass into the gasifier body;
An air supply system capable of supplying combustion air into the gasification furnace body;
I have a,
The plurality of fuel supply systems include a first fuel supply system capable of supplying biomass to a lower portion of the gasifier main body, and a second fuel capable of supplying biomass above the first fuel supply system in the gasifier main body. A fuel supply system,
The first fuel supply system is used for supplying biomass having a lower reaction rate than biomass supplied from the second fuel supply system.
Boiler equipment characterized by that.

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