CN109751614B - Solid fuel supply device, method for operating same, and combustion facility - Google Patents
Solid fuel supply device, method for operating same, and combustion facility Download PDFInfo
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- CN109751614B CN109751614B CN201811282075.8A CN201811282075A CN109751614B CN 109751614 B CN109751614 B CN 109751614B CN 201811282075 A CN201811282075 A CN 201811282075A CN 109751614 B CN109751614 B CN 109751614B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/10—Pulverizing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/50—Blending
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Abstract
The invention relates to a solid fuel supply device, an operation method thereof and a combustion facility, aiming to restrain the amount of air from the inside of a pulverizer passing through a storage part, well maintain the pressure inside the pulverizer, and realize the restraint of the increase of the installation cost and the restraint of the deterioration of maintenance performance. The solid fuel supply device (3) supplies coal-mixed biomass fuel as solid fuel to a pulverizer (2) that supplies fine powder fuel obtained by pulverizing solid fuel to a boiler main body (4). A solid fuel supply device (3) is provided with: a silo (25) for storing the coal-mixed biomass fuel supplied to the interior of the pulverizer (2); a biomass fuel transport device (23) that transports the biomass fuel to a silo (25); and a coal supply device (24) for mixing the biomass fuel conveyed to the silo (25) with coal. The coal supply device (24) mixes the coal so that the mixing ratio of the coal in the coal-mixed biomass fuel stored in the silo (25) is 4 to 50 wt%.
Description
Technical Field
The present invention relates to a solid fuel supply device and a combustion facility for supplying a carbon-containing solid fuel to a pulverizer, and a method for operating the solid fuel supply device.
Background
Among carbonaceous solid fuels supplied to a combustion device such as a boiler or an Integrated Gasification Combined Cycle (IGCC), biomass fuels are being mixed with carbon dioxide during the growth of biomass to neutralize the carbon, and are attracting attention as one of measures for reducing the amount of carbon dioxide discharged from a boiler or the like using fossil fuels. Biomass fuel such as woody fuel is introduced into a pulverizer in a sheet or pellet state, pulverized by the pulverizer, and then supplied to a burner or the like provided in a boiler.
For example, patent document 1 discloses a pulverizer for pulverizing a biomass fuel. In patent document 1, biomass fuel transported by a truck is charged into a supply hopper via various devices and stored. The biomass fuel stored in the supply hopper is discharged to the metering conveyor by a predetermined amount at a time through the feeder, and is further weighed by the metering conveyor and then supplied to the vertical roller mill through the double-hinged gate.
[ Prior Art document ]
[ patent document ]
[ patent document 1 ] Japanese patent application laid-open No. 2008-208360
Disclosure of Invention
[ SUMMARY OF THE INVENTION ]
[ problem to be solved by the invention ]
However, since the pieces or particles of the biomass fuel before pulverization are large in particle size and light in weight, when the biomass fuel is accumulated in a reservoir such as a supply hopper, gaps formed between the biomass fuels (gaps formed between the biomass fuel and adjacent biomass fuels) increase.
In general, the pressure inside the pulverizer is increased because a gas for transporting the pulverized fine fuel, which is the pulverized solid fuel, is supplied. The reservoir communicates with the inside of the pulverizer in order to supply the solid fuel to the inside of the pulverizer.
Therefore, when only the biomass fuel is accumulated in the accumulation portion, the sealing property of the accumulation portion is lowered to prevent the transportation gas such as air blown up from the inside of the pulverizer and the fine powder fuel from passing through the gaps formed between the biomass fuels, and the pressure inside the pulverizer may be lowered. When the transportation gas blows against the reservoir, the transportation of the biomass in the reservoir is deteriorated, dust is generated, and the pressure inside the pulverizer is lowered, which may cause various problems in the operation of the pulverizer, such as a decrease in the transportation amount of the fine powder fuel.
In the device of patent document 1, air in the vertical roller mill is prevented from passing through the feeder between the vertical roller mill and the feeder by a double-hinged shutter. However, since the double-hinged gate is provided between the vertical roller mill and the feeder, the installation cost is increased, and the maintenance of the double-hinged gate is required, so that the operability of the vertical roller mill may be deteriorated.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a solid fuel supply device, a combustion facility, and a method for operating a solid fuel supply device, which can suppress an increase in installation cost and a decrease in operability by suppressing the flow rate of a reverse flow caused by blowing up of a transport gas and a fine powder fuel from the inside of a pulverizer passing through a storage portion, thereby maintaining the pressure inside the pulverizer well.
[ MEANS FOR solving PROBLEMS ] A method for solving the problems
In order to solve the above problems, the solid fuel supply device, the combustion equipment, and the method for operating the solid fuel supply device according to the present invention adopt the following configurations.
A solid fuel supply device according to an aspect of the present invention is a solid fuel supply device for supplying biomass fuel and coal as solid fuel to a pulverizer for supplying fine powder fuel obtained by pulverizing the solid fuel to a boiler, the solid fuel supply device including: a storage unit that stores the solid fuel supplied to the inside of the pulverizer; a biomass fuel transport unit that transports the biomass fuel to the reservoir unit; and a coal mixing unit that mixes coal with the biomass fuel transported to the storage unit, wherein the coal mixing unit mixes the coal so that a mixing ratio of the coal in the solid fuel stored in the storage unit is 4 wt% or more and 50 wt% or less.
In the above configuration, the biomass fuel conveyed to the reservoir portion is mixed with coal. Thus, the solid fuel accumulated in the accumulation portion becomes a fuel in which the biomass fuel and the coal are mixed. Since coal has a smaller particle size than biomass fuel, the coal enters gaps formed between the biomass fuels stored in the reservoir. As a result, the coal blocks the gaps formed between the biomass fuels, so that the transport gas such as air and the fine powder fuel are less likely to pass through the reservoir, and the flow rate of the transport gas and the fine powder fuel flowing through the reservoir and blown up from the inside of the pulverizer and flowing backward can be suppressed. Therefore, the pressure inside the pulverizer can be maintained well.
In addition, the surface area of the entire solid fuel accumulated in the accumulation portion is increased by mixing the coal having a small particle size of the biomass fuel. When the surface area of the entire solid fuel accumulated in the accumulation portion is increased, the pressure loss of the transport gas and the fine powder fuel passing through the gaps of the accumulated solid fuel is increased. Accordingly, the transport gas and the fine powder fuel are less likely to pass through the reservoir, and therefore, the flow rate of the transport gas and the fine powder fuel blown up from the inside of the pulverizer and flowing backward through the reservoir can be suppressed. Therefore, the pressure inside the pulverizer can be maintained well.
Further, since there is no need to provide a special device such as a rotary valve for suppressing the flow rate of the carrier gas and the fine powder fuel blown up from the inside of the pulverizer and flowing backward in the storage portion or between the storage portion and the pulverizer, it is possible to suppress an increase in installation cost and a decrease in operability.
The coal mixing unit mixes the coal so that the mixing ratio of the coal in the solid fuel stored in the reservoir is 4 wt% or more and 50 wt% or less, and therefore the solid fuel mainly composed of the biomass fuel can be supplied to the boiler.
In the solid fuel supply device according to an aspect of the present invention, the coal mixing unit may mix the coal so that a mixing ratio of the coal in the solid fuel stored in the storage unit is 5 wt% or more and 10 wt% or less.
When the mixing ratio of the mixed coal is small, the coal does not sufficiently enter the gaps formed between the biomass fuels accumulated in the reservoir, and the transportation gas and the fine powder fuel from the inside of the pulverizer pass through the gaps, and the pressure inside the pulverizer may not be maintained satisfactorily.
On the other hand, when the mixing ratio of the mixed coal is large, for example, when the pulverizer has a structure suitable for the treatment of the biomass fuel (for example, a shape of the casing, a rotation speed of the pulverizing table, a rotation speed of the rotary classifier, or the like), coal having properties different from those of the biomass fuel may not be treated properly. When the amount of coal fine powder fuel that has not been appropriately processed by the pulverizer increases, the operating state of the boiler may change, and combustibility may decrease.
Therefore, in the above configuration, the mixing ratio of the mixed coal is 5 wt% or more and 10 wt% or less. This makes it possible to maintain the pressure inside the pulverizer well and to prevent the operating state of the boiler from decreasing.
In addition, a solid fuel supply device according to an aspect of the present invention may include: a supply unit that is provided between the storage unit and the pulverizer and supplies the solid fuel stored in the storage unit to the pulverizer; and a temperature measuring device that measures a temperature in the supply unit, wherein the coal mixing unit changes a mixing ratio of the coal based on the temperature measured by the temperature measuring device.
Since the high-temperature transportation gas is supplied into the pulverizer, the temperature of the transportation gas such as air in the pulverizer rises.
In the above-described configuration, since the supply portion is provided between the reservoir portion and the pulverizer, the transportation gas and the fine powder fuel in the pulverizer also flow through the supply portion when passing through the reservoir portion. Since the temperature of the transportation gas in the pulverizer is high due to the circulation of the high-temperature transportation gas in the pulverizer, the temperature in the supply portion rises when the transportation gas and the fine powder fuel in the pulverizer circulate in the supply portion. In the above configuration, the temperature measuring device measures the temperature inside the supply unit. Therefore, whether the transportation gas and the fine powder fuel in the pulverizer flow backward and pass through the storage portion can be reliably detected by the temperature in the supply portion. Further, since the mixing ratio of the coal is changed based on the measured temperature, the mixing ratio of the coal can be appropriately adjusted according to the flow rates of the transport gas and the fine powder fuel passing through the reservoir, and the flow rate at which the transport gas and the fine powder fuel passing through the interior of the pulverizer and passing through the reservoir are blown up and flow back can be more favorably suppressed.
Further, since the supply portion is provided between the reservoir portion and the pulverizer, when the conveyance gas blows up and a reverse flow occurs, the temperature detector measures the temperature relatively near the pulverizer, and therefore the conveyance gas is not cooled significantly by other structures and the like, and can be measured and sensed by the temperature detector while maintaining a relatively high temperature. Therefore, the temperature measuring device is less likely to be affected by other environments when measuring the temperature. This makes it possible to accurately determine whether or not the transport gas and the fine powder fuel pass through the reservoir.
Further, a combustion facility according to an aspect of the present invention includes: the solid fuel supply device according to any one of the above; a pulverizer that pulverizes the solid fuel supplied by the solid fuel supply device; and a combustion unit to which the solid fuel pulverized by the pulverizer is supplied.
According to the above configuration, the flow rate at which the transportation gas and the fine powder fuel from the inside of the pulverizer passing through the reservoir portion are blown up and flow backward is suppressed, whereby the pressure inside the pulverizer can be maintained satisfactorily. This stabilizes the supply of the coal biomass fuel to the pulverizer 2, and the pulverizer can appropriately handle the solid fuel. Therefore, the properties of the fine powder fuel supplied to the combustion section can be made appropriate, and the energy efficiency of the entire combustion facility can be improved.
A method of operating a solid fuel supply device according to an aspect of the present invention is a method of operating a solid fuel supply device that supplies biomass fuel and coal as solid fuel to a pulverizer that supplies fine powder fuel obtained by pulverizing the solid fuel to a boiler, the solid fuel supply device including a reservoir that accumulates the solid fuel supplied to the inside of the pulverizer, the method including: a biomass fuel transport step of transporting the biomass fuel to the reservoir; and a coal mixing step of mixing the biomass fuel transported to the storage unit with coal, wherein in the coal mixing step, the coal is mixed so that a mixing ratio of the coal in the solid fuel stored in the storage unit is 4 wt% or more and 50 wt% or less.
[ Effect of the invention ]
According to the present invention, the flow rate of the reverse flow caused by the blowing-up of the transportation gas and the fine powder fuel from the inside of the pulverizer passing through the accumulation portion is suppressed, whereby the pressure inside the pulverizer is favorably maintained, and the increase in installation cost and the decrease in operability can be suppressed.
Drawings
Fig. 1 is a schematic configuration diagram of a boiler plant according to a first embodiment of the present invention.
Fig. 2 is a graph showing the relationship between the mixing ratio of coal and the sealing property and the relationship between the mixing ratio of coal and the combustibility.
Fig. 3 is a diagram showing a model of a large-particle-diameter aligned state.
Fig. 4 is a diagram showing a model of a dense arrangement state of small particle diameters.
Fig. 5 is a graph showing a relationship between a small particle fraction and sealing performance.
Fig. 6 is a schematic configuration diagram of a boiler plant according to a second embodiment of the present invention.
Fig. 7 is a flowchart showing a process of changing the mixing ratio of coal.
[ notation ] to show
1 boiler plant (combustion plant)
2 disintegrating machine
3 solid fuel supply device
4 boiler main body (burning part)
7 crushed material supply pipe
9 burner
11 casing
13 fuel supply pipe
15 crushing table
16 crushing roller
20 gas supply pipe for transportation
21 rotary classifier
22 fin
23 Biomass fuel conveyor (Biomass fuel conveyor)
24 coal supply device (coal mixing part)
25 stock bin (storage part)
26 solid fuel feeder (supply part)
27 descending nozzle (accumulation part)
28 sealed gas supply pipe
34 thermometer and tester
35 control device
Detailed Description
Hereinafter, an embodiment of a solid fuel supply device, a boiler facility, and an operation method of a solid fuel supply device according to the present invention will be described with reference to the drawings.
[ first embodiment ]
Hereinafter, a first embodiment of the present invention will be described with reference to fig. 1.
Fig. 1 shows a boiler facility 1 including a pulverizer 2, a solid fuel supply device 3, and a boiler main body (combustion unit) 4 according to the present embodiment. In the present embodiment, the upper side represents the vertically upper direction, and the lower side represents the vertically lower direction.
The boiler plant (combustion plant) 1 includes a pulverizer 2, and the pulverizer 2 mainly pulverizes biomass fuel, which is solid fuel, supplied to a burner 9 provided in a boiler main body 4. Here, the biomass fuel is an organic resource obtained from a renewable organism, and examples thereof include woody biomass fuels such as a thinning material, waste wood, driftwood, and grasses, non-woody biomass fuels such as waste, dewatered sludge, and tires. The biomass fuel includes a granular or pellet-like recycled fuel and the like using these as a raw material, and is not limited to the fuel described here.
A pulverized material supply pipe 7 is connected to the pulverizer 2, and the fine powder fuel of the biomass fuel pulverized by the pulverizer 2 is guided to a burner 9 provided in the boiler main body 4 through the pulverized material supply pipe 7 together with heated air serving as a transport gas.
A flame is formed in the furnace in the boiler main body 4 by the burner 9, and steam is generated by a heat exchanger, not shown, in the boiler main body 4. The generated steam is guided to a steam turbine, not shown, to rotate the steam turbine. When the steam turbine is rotationally driven, a generator, not shown, coupled to a rotating shaft of the steam turbine rotates to generate electricity.
Next, the pulverizer 2 will be explained.
The housing 11 constituting the outer shell of the pulverizer 2 has a vertical substantially cylindrical hollow shape, and a fuel supply pipe 13 is attached to the center of the ceiling portion 12. The fuel supply pipe 13 supplies biomass fuel mixed with a predetermined amount of coal (hereinafter, referred to as "coal-mixed biomass fuel". about a coal mixing method and the like, which will be described later) introduced from the solid fuel supply device 3 into the casing 11, and is disposed at a central position of the casing 11 in the vertical direction (vertical direction), and has a lower end portion extending into the casing 11.
A mount 14 is provided in the housing 11, and a grinding table 15 is rotatably disposed on the mount 14. The lower end of the fuel supply pipe 13 is disposed opposite to the center of the pulverization table 15. The fuel supply pipe 13 supplies the coal-mixed biomass fuel from above to the pulverizing table 15 below. The mill table 15 is rotatable about a central axis in the vertical direction (vertical direction), and is rotationally driven by the drive device 10.
A plurality of (e.g., 3) pulverizing rollers 16 are disposed above the pulverizing table 15 so as to face each other. Each of the mill rollers 16 is disposed above the outer peripheral portion of the mill table 15 at regular intervals in the circumferential direction (in fig. 1, only 2 mill rollers 16 are shown for the sake of illustration). When the mill table 15 rotates with the outer peripheral surface thereof in contact with the upper surface of the mill table 15, the mill roller 16 receives a rotational force from the mill table 15 and rotates together therewith. When the coal-mixed biomass fuel is supplied from the fuel supply pipe 13, the coal-mixed biomass fuel is pressed between the grinding roller 16 and the grinding table 15 and ground to become a fine powder fuel.
A gas supply pipe 20 for transportation is connected to a lower portion of the casing 11. The conveyance gas supplied through the conveyance gas supply pipe 20 is guided into the casing 11 and supplied to a space below the pulverization table 15. The carrier gas is set to a high temperature for preheating and drying the solid fuel to be carried, and is set to, for example, about 120 degrees (c) to 150 degrees (c). Therefore, the temperature of the space below the grinding table 15 is about 120 to 150 degrees. The gas for conveyance in the present embodiment is air blown from, for example, a blower not shown. The temperature of the transportation gas may be adjusted by mixing heated air supplied through a heat exchanger (heater) such as an air preheater (not shown) using the combustion gas of the boiler main body 4 as a heat source.
A rotary classifier 21 is provided at an upper portion of the casing 11. The rotary classifier 21 is disposed so as to surround the fuel supply pipe 13, and rotates around the fuel supply pipe 13 by a driving force from a driving device (not shown). The plurality of fins 22 attached to the outer peripheral side thereof rotate in the circumferential direction in accordance with the rotation of the rotary classifier 21. The pulverized material pulverized by the pulverization table 15 and the pulverization rollers 16 is lifted up by the flow of the transportation gas that rises from below the pulverization table 15 through the outer peripheral side of the pulverization table 15. Among the rolled pulverized materials, the pulverized material having a relatively large diameter is dropped by the fins 22, returned to the pulverization table 15, and pulverized again. Thereby, the pulverized material is classified by the rotary classifier 21 to become a fine powder fuel. Since the conveyance gas is used to convey and cool the pulverized material in the casing 11 while drying it, the temperature of the upper space of the casing 11 is, for example, about 60 degrees.
The ceiling portion 12 is connected to a plurality of pulverized material supply pipes 7. The pulverized material supply pipe 7 discharges the fine powder fuel classified by the rotary classifier 21, and guides the gas for transporting the discharged fine powder fuel to the burner 9 of the boiler main body 4. The pulverized material supply pipes 7 are connected to a plurality of openings provided in the ceiling portion 12. The number of the pulverized material supply pipes 7 varies depending on the size and the pulverization capacity of the pulverizer 2, but is generally in the range of 2 to 8, and is often 4 to 6. In fig. 1, only 1 root is illustrated due to the illustrated relationship.
The solid fuel supply device 3 includes: a biomass fuel conveying device (biomass fuel conveying unit) 23 that conveys the biomass fuel stored in a silo (not shown) to a silo (storage unit) 25; a coal supply device (coal mixing unit) 24 for substantially uniformly scattering coal to the biomass fuel transported by the biomass fuel transport device 23 and mixing a required amount of coal; a bunker 25 for storing the coal-mixed biomass fuel mixed with coal by the coal supply device 24; and a solid fuel feeder (feeder) 26 for feeding the coal-mixed biomass fuel introduced from the bunker 25 to the pulverizer 2. The solid fuel supply device 3 further includes: a descending nozzle (reservoir) 27 directly connecting the lower end of the silo 25 to the solid fuel feeder 26; and a seal gas supply pipe 28 for supplying a seal gas such as air or an inert gas into the solid fuel feeder 26.
The biomass fuel transport device 23 has a biomass fuel hopper 23a for temporarily accumulating the biomass fuel from the silo and a first conveyor belt 23 b. The biomass fuel transport device 23 carries the biomass fuel from the biomass fuel hopper 23a on the first conveyor belt 23 b. In the state of being conveyed by the biomass fuel conveying device 23, the biomass fuel is in a granular state before being pulverized. The size of the particles is, for example, about 6 to 8mm in diameter and about 40mm or less in length. The supply amount of the biomass fuel to the silo 25 is adjusted by the belt speed of the first conveyor belt 23 b.
The coal feeder 24 includes a coal hopper 24a for temporarily storing coal and a second conveyor belt 24b, and is disposed such that the downstream end of the second conveyor belt 24b is positioned above the first conveyor belt 23b, for example. The coal supply device 24 adjusts the supply flow rate of the coal fuel by the belt speed of the second conveyor belt 24b that carries the coal from the coal hopper 24a while placing the coal on the second conveyor belt 24 b. The coal is dropped downward from the downstream end of the second conveyor belt 24b, and the coal is substantially uniformly scattered on the biomass fuel placed on the first conveyor belt 23 b. The coal supply device 24 mixes the coal so that the mixing ratio of the coal in the coal-mixed biomass fuel stored in the bunker 25 is, for example, 4 wt% or more and 50 wt% or less, and more preferably 5 wt% or more and 10 wt% or less.
The particle size of the coal supplied from the coal supply device 24 (i.e., the coal before pulverization) is, for example, about 7 to 8mm in 80% passing particle size. The mixing ratio of coal in the coal-mixed biomass fuel can be appropriately adjusted depending on the properties, particle size, and the like of the biomass fuel or coal, and the same effect can be obtained by setting the mixing ratio to an appropriate value range of 50 wt% or less, for example.
Even if pulverized into a fine powder fuel coarser than coal, the biomass fuel can ensure combustibility of the burner 9 of the boiler main body 4. On the other hand, when the pulverizer 2 is configured to be suitable for processing of the biomass fuel (for example, the shape of the casing 11, the rotational speed of the pulverizing table 15, the rotational speed of the rotary classifier 21, or the like), coal having properties different from those of the biomass fuel cannot be processed properly, and the coal is supplied as the fine powder fuel to the combustor 9 while being kept in a coarse particle state, and there is a possibility that combustion performance is deteriorated. Therefore, it is preferable to set an upper limit for increasing the mixing ratio of the coal fuel to the biomass fuel.
The hopper 25 is disposed substantially vertically below the downstream end of the first conveyor belt 23 b. The magazine 25 is formed in, for example, a substantially cylindrical shape, and an inclined surface is formed so as to have a diameter reduced from the vicinity of a substantially center in the vertical direction. The lower end of the silo 25 is connected to the upper end of a downdraft tube 27.
The solid fuel feeder 26 includes a housing 26a constituting a casing and a third conveyor 26b disposed inside the housing 26 a. A descending nozzle 27 is connected to the upper surface of the frame 26a, and a seal gas supply pipe 28 and the fuel supply pipe 13 are connected to the lower surface of the frame 26 a. The upstream end of the third conveyor belt 26b is disposed below the connecting portion between the frame 26a and the downcomer nozzle 27, and the downstream end of the third conveyor belt 26b is disposed above the connecting portion between the frame 26a and the fuel supply pipe 13.
The descent nozzle 27 is a metal pipe extending linearly in the vertical direction (vertical direction), and the coal-mixed biomass fuel is stacked inside. That is, the amount of the coal-mixed biomass fuel supplied from the biomass fuel conveyor 23 to the silo 25 and the amount of the coal-mixed biomass fuel supplied from the solid fuel supplier 26 to the pulverizer are balanced, and the coal-mixed biomass fuel is loaded into the drop nozzle 27. The downcomer pipe 27 is directly connected to the lower end of the bunker 25 and the solid fuel feeder 26, and the downcomer pipe 27 is not provided with a special device such as a rotary valve for suppressing a reverse flow caused by blowing up of the carrier gas and the fine powder fuel from the inside of the pulverizer 2. The size of the downcomer pipe 27 varies depending on the properties, particle size, supply amount, and the like of the solid fuel to be supplied, and for example, the length in the vertical direction is set to about 1 to 5m when the diameter is about 600mm, and about 2 to 5m when the diameter is about 900 mm.
The seal gas supply pipe 28 supplies seal gas such as air supplied from a seal gas supply device (not shown) to the inside of the housing 26a of the solid fuel feeder 26. The inside of the housing 26a is in a higher pressure state than the inside of the pulverizer 2 by the sealing gas. The sealing gas is filled in the housing 26a and flows into the pulverizer 2 through the fuel supply pipe 13. Since the temperature of the sealing gas is about 30 degrees, the temperature inside the housing 26a is about 30 degrees during normal operation of the pulverizer 2. Therefore, as will be described later, the temperature sensor 34 can easily detect the reverse flow caused by the blowing-up of the carrier gas and the fine fuel powder.
The operation of the pulverizer 2 and the boiler facility 1 according to the present embodiment for pulverizing biomass fuel will be described below.
The biomass fuel stored in the silo is transferred to the biomass fuel hopper 23a by a transfer device (not shown) and temporarily stored in the biomass fuel hopper 23 a. The biomass fuel temporarily stored in the biomass fuel hopper 23a is transported by a required amount to the silo 25 by the first conveyor belt 23b (biomass fuel transport step).
Meanwhile, the coal is conveyed to the coal hopper 24a by a conveyor (not shown) and temporarily accumulated in the coal hopper 24 a. The coal temporarily accumulated in the coal hopper 24a is transported by a required amount by the second conveyor belt 24 b. The coal conveyed by the second conveyor belt 24b falls onto the first conveyor belt 23b, for example, from the downstream end of the second conveyor belt 24 b. Since the biomass fuel is transported by the first conveyor belt 23b, the coal is scattered substantially uniformly onto the biomass fuel, and the coal-mixed biomass fuel is produced (coal mixing step). The coal-mixed biomass fuel falls from the downstream end of the first conveyor belt 23b into the silo 25. The coal-mixed biomass fuel dropped into the bunker 25 is loaded and accumulated inside the bunker 25 and inside the descent nozzle 27.
The coal-mixed biomass fuel stored in the bunker 25 and the downcomer 27 is transported by the third conveyor 26b built in the solid fuel feeder 26 and fed to the fuel supply pipe 13. The coal-mixed biomass fuel supplied to the fuel supply pipe 13 falls toward the inside of the pulverizer 2. At this time, inside the solid fuel feeder 26, the pressure inside the housing 26a of the solid fuel feeder 26 is higher than the pressure inside the pulverizer 2 due to the seal gas supplied from the seal gas supply pipe 28. Therefore, the coal-mixed biomass fuel falls well into the pulverizer 2.
The coal-mixed biomass fuel supplied into the pulverizer 2 falls onto the pulverizing table 15, moves to the outer peripheral side by centrifugal force, and is pulverized between the plurality of pulverizing rollers 16 and the pulverizing table 15 to become fine powder fuel. The pulverized coal-mixed biomass fuel rises in the pulverizer 2 by the transportation gas that passes through the transportation gas supply pipe 20 and is blown into the pulverizer 2.
Above the grinding table 15, a rotary classifier 21 composed of a plurality of fins (blades) 22 rotates, and the coarsely and heavily ground material is knocked off by centrifugal force of the fins 22 and returned to the grinding table 15. The pulverized material is repeatedly pulverized again by the pulverization table 15 until the particle diameter becomes smaller than a predetermined diameter. The pulverized material having a reduced particle size is passed through the rotary classifier 21, discharged from the pulverizer 2, and conveyed to the outside through the pulverized material supply pipe 7. The carrier gas mixed with the carried fine fuel powder is carried to the burner 9 of the boiler main body 4 and burned.
According to the present embodiment, the following operational effects are exhibited.
In the present embodiment, coal is mixed with the biomass fuel conveyed to the silo 25. Thus, the solid fuel accumulated in the bunker 25 and the downcomer 27 becomes a coal-mixed biomass fuel in which the biomass fuel is mixed with coal. Since coal has a smaller particle size than biomass fuel, in coal-mixed biomass fuel, coal enters gaps formed between the biomass fuels. As a result, the coal blocks the gaps formed between the biomass fuels, and therefore the transportation gas and the pulverized fuel from the inside of the pulverizer 2 are less likely to pass through the bunker 25 and the drop nozzle 27. This can suppress the flow rate of the carrier gas and the fine powder fuel flowing through the silo 25 and the downcomer nozzle 27 and flowing backward from the inside of the pulverizer 2 due to the blow-up. That is, the coal-blended biomass fuel has improved sealing properties at the bunker 25 and the downcomer pipe 27 compared to the biomass fuel alone, which is not blended with coal. Therefore, the coal-mixed biomass fuel accumulated in the silo 25 and the downcomer pipe 27 functions as a sealing material, and thus the pressure inside the pulverizer 2 can be maintained satisfactorily. Thus, the carrier gas mixed with the fine powder fuel is stably supplied to the burner 9 of the boiler main body 4 through the pulverized material supply pipe 7.
In addition, the mixing ratio of the coal having a small particle size of the biomass fuel increases the surface area of the entire solid fuel stored in the silo 25 and the downcomer 27. Since the transportation gas and the fine fuel from the inside of the pulverizer 2 that are to pass through the silo 25 and the downcomer 27 flow while contacting the surface of the solid fuel, when the surface area of the entire solid fuel stored in the silo 25 and the downcomer 27 is increased, the pressure loss when the transportation gas and the fine fuel pass through the gaps of the stored solid fuel is increased. Accordingly, the carrier gas and the fine powder fuel are less likely to pass through the silo 25 and the drop nozzle 27, and therefore the flow rate of the carrier gas and the fine powder fuel flowing through the silo 25 and the drop nozzle 27 and flowing back from the inside of the pulverizer 2 due to the blow-up can be suppressed. Therefore, the pressure inside the pulverizer 2 can be maintained well. Thus, the carrier gas mixed with the fine powder fuel is stably supplied to the burner 9 of the boiler main body 4 through the pulverized material supply pipe 7.
Further, since the descent nozzle 27 does not need to be provided with a special device or the like (for example, a rotary valve or the like) for suppressing the flow rate of the reverse flow caused by the blowing-up of the transportation gas and the fine powder fuel from the inside of the pulverizer 2 passing through the hopper 25 and the descent nozzle 27, it is possible to suppress an increase in installation cost and a decrease in operability as compared with the case of providing the device or the like.
Further, according to the present embodiment, the pressure inside the pulverizer 2 can be maintained satisfactorily by suppressing the flow rate of the carrier gas and the fine powder fuel flowing through the hopper 25 and the down nozzle 27 and flowing in a reverse direction due to the blowing-up of the carrier gas and the fine powder fuel from the inside of the pulverizer 2. This stabilizes the supply of the coal biomass fuel to the pulverizer 2, and the pulverizer 2 can appropriately handle the solid fuel. Therefore, the properties of the fine powder fuel supplied to the boiler main body 4 can be made appropriate, and the energy efficiency of the entire boiler plant 1 can be improved.
When the mixing ratio of the mixed coal is small, the coal does not sufficiently enter the gaps formed between the biomass fuels stored in the silo 25 and the downcomer pipe 27. As a result, the transportation gas and the fine fuel from the inside of the pulverizer 2 pass through the gap, and the pressure inside the pulverizer 2 may not be maintained satisfactorily.
On the other hand, when the mixing ratio of the mixed coal is large, the coal may not be properly processed in the pulverizer 2. Specifically, although the pulverized coal is not particularly highly combustible and therefore needs to be pulverized finer than the biomass fuel and supplied to the combustor 9, the pulverizer 2 is adjusted to a configuration suitable for the treatment of the biomass fuel (for example, a casing shape, a rotation speed of the pulverizing table 15, a rotation speed of the rotary classifier 21, and the like), and therefore, among the coal contained in the coal-mixed biomass fuel, coarse coal having a size not pulverized to be necessary as the fine powder fuel of the coal exists. Coarse coal is mixed with the pulverized fine powder fuel and supplied to the combustor 9, whereby combustibility in the combustor 9 is reduced and the amount of unburned fine coal powder may increase. When the amount of unburned fine coal particles increases in the burner 9, ash accumulates in the bottom of the boiler main body 4, and there is a possibility that environmental problems may be reduced due to an increase in the amount of CO produced, an increase in NOx, and the like.
In the present embodiment, the mixing ratio of the coal to be mixed is, for example, 4% by weight or more and 50% by weight or less, and more preferably 5% by weight or more and 10% by weight or less. This can maintain the pressure inside the mill satisfactorily, and also prevent the combustibility of the boiler main body 4 from decreasing. The mixing ratio of coal in the coal-mixed biomass fuel can be appropriately adjusted by the properties, particle size, and the like of the biomass fuel or coal, and similar effects can be obtained by setting the mixing ratio to an appropriate value range of 50 wt% or less, for example.
Here, the relationship between the effect of improving the sealing property of the coal-mixed biomass fuel and the combustibility of the boiler main body 4 will be described with reference to fig. 2.
Fig. 2 shows the relationship between the mixing ratio of coal and the sealing property (shown by a solid line in the figure) and the relationship between the mixing ratio of coal and the combustibility (shown by a one-dot chain line in the figure). The relationship between the mixing ratio of coal and the sealing property is expressed by assuming that the coal content is 1.0 in the case of 100%. The relationship between the mixing ratio of coal and combustibility is expressed as 1.0 in the case of 100% biomass fuel.
As is clear from fig. 2, the sealing property with respect to the mixing ratio of coal to biomass fuel is improved as the mixing ratio of coal to biomass fuel is increased. It is also found that the sealing property is drastically improved and saturation occurs at 50 wt% or more when the mixing ratio of the coal is from about 0 wt% to about 10 wt% (see fig. 5 described later). It is also known that the combustibility with respect to the mixing ratio of coal is reduced as the mixing ratio of coal to biomass fuel is increased. This is because, since the combustibility is adjusted to a configuration suitable for the treatment of the biomass fuel (for example, the shape of the casing, the rotational speed of the mill table 15, the rotational speed of the rotary classifier 21, or the like) as described above, if the mixing ratio of the coal is excessively increased, coarse-grained coal is mixed with the fine powder fuel and supplied to the burner 9, and the combustibility of the burner 9 is lowered.
From this, it is found that the sealing property is high without significantly lowering the combustion property, for example, from 4 to 50% by weight, and more preferably from 5 to 10% by weight, in the mixing ratio of the coal.
The present invention is made based on the finding that the sealing property is greatly improved even when the mixing ratio of coal is low.
The sealing property is greatly improved even when the mixing ratio of the coal is low as follows. Hereinafter, description will be given with reference to fig. 3 to 5.
The invention of the present application is an invention that finds the following: in the case of biomass fuel alone (particles having a large particle size), although the gaps (porosity) formed between the biomass fuels are large, the porosity is decreased by adding coal (particles having a small particle size), and the sealing property can be rapidly improved.
The particles of the biomass fuel (large-particle-diameter particles) and the coal (small-particle-diameter particles) are formed into a spherical shape in a pseudo manner, and the biomass fuel (large-particle-diameter particles) is in a state in which many pores are generated, and therefore, they are arranged in order. When n particles having a particle diameter D are aligned in the vertical and horizontal directions (see fig. 3. fig. 3 shows a case where 3 particles having a particle diameter D are aligned in the vertical and horizontal directions, for example), the porosity is represented by the following formula (1).
＝1-〔[(π/4)×D2×n×n]/(D×n×D×n)〕···(1)
That is, the porosity is represented by the following formula (2).
1-(π/4)···(2)
That is, when the particles are aligned, the porosity is about 21.5% which is constant regardless of the size of the particle diameter.
However, the porosity is reduced by mixing the densely arranged state of the particles (coal in the present embodiment) having the small particle diameter (particle diameter D) (see fig. 4. fig. 4 shows, for example, a case where 7 particles having the small particle diameter are arranged in the densely arranged state) with respect to the aligned state (hereinafter referred to as "aligned state") of the particles having the large particle diameter (particle diameter D) (biomass fuel in the present embodiment). Here, mixing of particles having a small particle size with particles having a large particle size is simulated by changing one or more of a part of the particles having a large particle size in an aligned state to particles having a small particle size in a densely aligned state. As an example, a case is shown in which 1 or more of 9 large-sized particles are changed to small-sized particles in a densely arranged state.
The pressure loss (Δ p/L) per unit length of the fluid flowing through the solid particle-packed layer is expressed by the following formula (3) from the formula of kezernian kalman.
Δp/L＝K×V×μ×Sv2×(1-)2/3···(3)
Wherein, K: coefficient of Kezeni
V: superficial velocity
μ: viscosity of fluid
: porosity of the product
Sv: surface area per unit volume of particles
The leakage flow rate is proportional to the superficial velocity obtained according to the above formula of kezerni kalman, and therefore the sealing property can be evaluated by the flow rate ratio capable of suppressing the leakage. Therefore, the sealing property can be expressed by the following formula (4).
[ (leakage flow rate in the state of becoming standard) - (leakage flow rate in the state of deriving sealing rate) ]/(leakage flow rate in the state of becoming standard) · (4)
The graph of fig. 5 shows the small particle fraction as a function of the tightness.
In fig. 5, the sealing property is expressed by the following formula (5) in accordance with the above formula (4).
[ maximum leakage flow (Ca ═ 0%) -leakage flow (Ca ═ X%) ]/maximum leakage flow (Ca ═ 0%) · (5)
Wherein, Ca: the small particle ratio (the ratio of the number of densely arranged small particles to the number of densely arranged small particles added to the number of densely arranged large particles, for example, in the case where 1 of the large-sized particles in FIG. 3 is densely arranged small particles, the small particle ratio is 1/9, which is about 11%)
The leakage flow rate Q is expressed by the following formula (6).
Q＝K×V＝K/(Δp/L)···(6)
Wherein, K: coefficient of Kezeni
V: superficial velocity
As is clear from the graph of fig. 5, the small particle fraction is a low value, and the sealing property is drastically improved. This is because the surface area Sv increases sharply by mixing small particles, and the pressure loss Δ p/L increases.
Further, with respect to the sealing property, from the graph of fig. 5, if the mixing ratio of the coal is, for example, 4 wt%, the sealing property becomes about 0.5, and the leakage flow rate is halved, and it is estimated that the leakage is greatly improved, and if the mixing ratio of the coal is, for example, 50 wt% or more, the sealing property is saturated to about 1.0, and it is estimated that the leakage flow rate is almost vanished. In addition, in consideration of the combustibility shown in fig. 2, it is not preferable to increase the mixing ratio of the coal to a large extent, and therefore, it is considered that the mixing ratio of the coal is preferably from 4 to 50% by weight from the viewpoint of sealing property.
If the mixing ratio of the coal is, for example, 5 wt%, the sealing property becomes about 0.6 and the leakage flow rate decreases to about 40%, and it is estimated that the problem of the occurrence of leakage is almost eliminated, and if the mixing ratio of the coal is, for example, 10 wt% or more, the sealing property becomes about 0.8 and it is estimated that the sealing property is sufficient. Therefore, the sealing property is sufficient at from 5 to 10% by weight, and the sealing property and the combustibility including the combustibility shown in fig. 2 are high, and are considered to be more preferable.
Therefore, as can be seen from the above-mentioned equation and the graph, the sealing property is drastically improved by mixing a small amount of particles (coal in the present embodiment) having a small particle diameter with particles having a large particle diameter (biomass in the present embodiment).
[ second embodiment ]
Next, a second embodiment of the present invention will be described with reference to fig. 6 and 7. The solid fuel supply device 33 of the present embodiment is different from the first embodiment in that it includes a temperature detector 34 and a control device 35. The same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
As shown in fig. 6, the temperature sensor 34 is provided inside the solid fuel feeder 26, for example, above a connection portion between the solid fuel feeder 26 and the fuel supply pipe 13. That is, the temperature sensor 34 is provided near the upper end of the fuel supply pipe 13. The temperature sensor 34 measures the temperature inside the housing 26a of the solid fuel supplier 26, and transmits the measured temperature to the control device 35.
The control device 35 controls the coal supply device 24 based on the temperature measured by the temperature measuring device 34, and adjusts the mixing ratio of the coal mixed with the biomass fuel. Specifically, the belt speed of the second conveyor belt 24b of the coal supply device 24 is adjusted to adjust the amount of coal to be scattered onto the biomass fuel.
The control device 35 is composed of, for example, a cpu (central Processing unit), a ram (random access memory), a rom (read Only memory), and a computer-readable storage medium. A series of processes for realizing various functions is stored in a storage medium or the like in the form of a program as an example, and the CPU reads out the program to the RAM or the like and executes processing of information and arithmetic processing to realize various functions. The program may be installed in advance in a ROM or another storage medium, provided in a state of being stored in a computer-readable storage medium, distributed via wired or wireless communication means, or the like. The computer-readable storage medium is a magnetic disk, an optical magnetic disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like.
Next, the mixing ratio changing process performed by the control device 35 of the present embodiment will be described with reference to the flowchart of fig. 7.
First, the controller 35 obtains the temperature inside the solid fuel supplier 26 measured by the temperature detector 34 (S1). Next, it is determined whether or not the acquired temperature is equal to or higher than a predetermined temperature (S2). When the acquired temperature is equal to or higher than a predetermined temperature (for example, 50 degrees), the process proceeds to S3. If the acquired temperature is not equal to or higher than the predetermined temperature, the process returns to S1.
At S3, it is determined that a backflow occurs due to the blowing-up of the transportation gas and the fine powder fuel inside the pulverizer 2, and the belt speed of the second conveyor belt 24b of the coal supply device 24 is increased to increase the mixing ratio of the coal from a predetermined weight%. Here, for example, an increase of 1 wt.% is made. When the mixing ratio of the coal is increased by 1 wt%, the flow proceeds to S4. In S4, the temperature inside the solid fuel supply device 26 measured by the temperature detector 34 is acquired, and it is determined whether or not the temperature increase has stopped. The determination of S4 may be performed after a predetermined time has elapsed since the mixing ratio of coal was increased by 1 wt% in S3. When the temperature rise stops, the process proceeds to S5. If the temperature rise is not stopped, the process proceeds to S3, where the mixing ratio of the coal is further increased by, for example, 1 wt%.
In S5, the operation is performed for a while without increasing the amount of coal to be mixed, and after a lapse of a predetermined time, the mixing ratio of the coal is gradually decreased by, for example, 1 wt% each time to return to the predetermined mixing ratio, that is, the predetermined weight%. When the mixing ratio of the coal is returned to the predetermined mixing ratio, the process proceeds to S1.
The above control is an example, and numerical values and the like may be appropriately changed. For example, the predetermined temperature for increasing the mixing ratio of the coal is not limited to 50 degrees, and may be a temperature based on the temperature of the conveyance gas blown up from the inside of the pulverizer 2 and flowing in a reverse direction, as long as the temperature is a temperature at which the occurrence of a reverse flow caused by blowing up can be sensed. The ratio of increasing the mixing ratio of the coal is not limited to 1% by weight each time. It may be more than 1% by weight or less than 1% by weight.
According to the present embodiment, the following operational effects are exhibited.
In the present embodiment, the solid fuel feeder 26, the temperature of which is measured by the temperature detector 34, is provided between the drop nozzle 27 and the pulverizer 2. As a result, the transportation gas and the fine fuel in the pulverizer 2 flow through the solid fuel feeder 26 when passing through the drop nozzle 27.
In the normal operation, the temperature in the solid fuel feeder 26 is substantially the same as the temperature of the seal gas, for example, about 30 degrees. On the other hand, since the high-temperature transportation gas is supplied into the pulverizer 2, the temperature of the transportation gas in the pulverizer 2 increases. The temperature in the pulverizer 2 is, for example, about 60 degrees in the upper space of the pulverizer 2 away from the connecting portion of the conveying gas supply pipe 20. Therefore, when the transportation gas and the fine powder fuel in the pulverizer 2 flow through the solid fuel feeder 26, the temperature in the solid fuel feeder 26 rises.
In the present embodiment, the temperature detector 34 measures the temperature inside the solid fuel supplier 26, and determines whether the temperature inside the solid fuel supplier 26 is, for example, 50 degrees or more. Accordingly, when the temperature inside the solid fuel feeder 26 rises to 50 degrees or more, it can be determined that the transportation gas and the fine powder fuel in the pulverizer 2 flow back by blowing up in the fuel supply pipe 13, flow into the solid fuel feeder 26, and pass through the descent nozzle 27 and the bunker 25. Therefore, whether the transportation gas and the fine powder fuel in the pulverizer 2 pass through the descent nozzle 27 and the silo 25 can be reliably detected by a simple method.
In the present embodiment, when it is determined that the transportation gas and the fine fuel in the pulverizer 2 pass through the drop nozzle 27 and the silo 25, the mixing ratio of the coal is increased from the predetermined mixing ratio and then decreased. This makes it possible to form the mixing ratio of the coal corresponding to the flow rate of the reverse flow caused by the blow-up of the carrier gas and the fine powder fuel passing through the downcomer 27 and the silo 25, to reliably prevent the carrier gas and the fine powder fuel in the pulverizer 2 from passing through the downcomer 27 and the silo 25, and to prevent the combustion state of the boiler main body 4 from being lowered by excessively increasing the mixing ratio of the coal.
Since the solid fuel supplier 26 is provided between the drop nozzle 27 and the pulverizer 2, the temperature measuring device 34 measures a relatively near temperature of the pulverizer 2. Thus, the transportation gas is not cooled significantly by other structures and the like, and can be measured and sensed by the temperature sensor 34 while maintaining a relatively high temperature. Therefore, when the temperature is measured by the temperature measuring device 34, it is less likely to be affected by other environments such as the sealing gas supplied into the solid fuel supplier 26. This makes it possible to accurately judge whether or not the back flow caused by the blowing of the transportation gas and the fine fuel in the pulverizer 2 passes through the downcomer 27 and the silo 25.
The present invention is not limited to the inventions according to the above embodiments, and can be modified as appropriate without departing from the scope of the invention.
For example, although the biomass fuel and the coal are mixed by scattering the coal to the biomass fuel conveyed by the first conveyor belt 23b of the biomass fuel conveyor 23 in each of the above embodiments, the biomass fuel may be mixed by scattering the biomass fuel to the coal conveyed by the second conveyor belt 24b of the coal supply device 24. Alternatively, the biomass fuel and the coal may be directly supplied from the biomass fuel conveyor 23 and the coal supply device 24 to the silo 25 to be mixed.
In the above embodiments, the solid fuel supply device is provided in the boiler facility 1, but the solid fuel supply device may supply fuel to a combustion device such as an Integrated Gasification Combined Cycle (IGCC).
Claims (5)
1. A solid fuel supply device for supplying biomass fuel and coal as solid fuel to a pulverizer for supplying fine powder fuel obtained by pulverizing the solid fuel to a boiler, the solid fuel supply device comprising:
a storage unit that stores the solid fuel supplied to the inside of the pulverizer;
a biomass fuel transport unit that transports the biomass fuel to the storage unit; and
a coal mixing unit that mixes the coal with the biomass fuel transported to the storage unit,
the coal mixing unit mixes the coal so that the mixing ratio of the coal in the solid fuel stored in the storage unit is 4 wt% or more and 50 wt% or less,
in the solid fuel accumulated in the accumulation portion, the weight of the biomass fuel is greater than the weight of the coal, or the weight of the biomass fuel is the same as the weight of the coal.
2. The solid fuel supply apparatus according to claim 1,
the coal mixing unit mixes the coal so that a mixing ratio of the coal in the solid fuel stored in the storage unit is 5 wt% or more and 10 wt% or less.
3. The solid fuel supply apparatus according to claim 1,
the solid fuel supply device is provided with:
a supply unit that is provided between the storage unit and the pulverizer and supplies the solid fuel stored in the storage unit to the pulverizer; and
a temperature measuring device for measuring the temperature in the supply part,
the coal mixing unit increases the mixing ratio of the coal when the temperature measured by the temperature measuring device is equal to or higher than a predetermined temperature.
4. A combustion apparatus is provided with:
a solid fuel supply device according to any one of claims 1 to 3;
a pulverizer that pulverizes the solid fuel supplied by the solid fuel supply device; and
and a combustion unit to which the solid fuel pulverized by the pulverizer is supplied.
5. A method for operating a solid fuel supply device for supplying biomass fuel and coal as solid fuel to a pulverizer for supplying fine powder fuel obtained by pulverizing the solid fuel to a boiler,
the solid fuel supply device is provided with a storage part for storing the solid fuel supplied to the interior of the pulverizer, wherein the weight of the biomass fuel in the stored solid fuel is larger than that of the coal, or the weight of the biomass fuel is the same as that of the coal,
the method for operating the solid fuel supply device includes:
a biomass fuel transport step of transporting the biomass fuel to the storage section; and
a coal mixing step of mixing the coal with the biomass fuel transported to the storage portion,
in the coal mixing step, the coal is mixed so that the mixing ratio of the coal in the solid fuel stored in the storage portion is 4 wt% or more and 50 wt% or less.
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| JP2017212874A JP6971784B2 (en) | 2017-11-02 | 2017-11-02 | Operation method of solid fuel supply device and combustion equipment and solid fuel supply device |
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| JP7423204B2 (en) * | 2019-06-28 | 2024-01-29 | 三菱重工業株式会社 | Grinding equipment, boiler system, and method of operating the grinding equipment |
| KR102286906B1 (en) * | 2019-11-01 | 2021-08-06 | 한국남동발전 주식회사 | Method for producing Bio-char using the process of the biomass fired boiler |
| CN110749522B (en) * | 2019-11-13 | 2020-09-22 | 扎鲁特旗扎哈淖尔煤业有限公司 | Crushing type coal quality identification device |
| JP2021085634A (en) * | 2019-11-29 | 2021-06-03 | 三菱パワー株式会社 | Solid fuel crushing system and electric power generating plant comprising the same as well as control method for solid fuel crushing system |
| JP2022063523A (en) * | 2020-10-12 | 2022-04-22 | 三菱重工業株式会社 | Solid fuel crushing apparatus, power generation plant, and operation method for solid fuel crushing apparatus |
| CN113526165B (en) * | 2021-07-15 | 2022-11-18 | 神华北电胜利能源有限公司 | Coal pulverizer discharge system |
| CN113790462A (en) * | 2021-09-08 | 2021-12-14 | 煤科院节能技术有限公司 | Biomass powder fuel storage and supply device |
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| JP2008208360A (en) | 2007-02-01 | 2008-09-11 | Ube Ind Ltd | Solid fuel and method for preparing the same |
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| JP5566867B2 (en) * | 2010-11-25 | 2014-08-06 | 三菱重工業株式会社 | Biomass / coal mixed combustion system and biomass / coal mixed combustion method |
| CN104329660A (en) * | 2011-09-30 | 2015-02-04 | 三菱重工业株式会社 | Biomass crushing device and biomass/coal co-combustion system |
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| JP6971784B2 (en) | 2021-11-24 |
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