KR20200062035A - Solid fuel supply apparatus, solid fuel supply method, pulverizer and boiler - Google Patents

Abstract

The present invention relates to a solid fuel supply apparatus, a method thereof, and a boiler. According to the present invention, by suppressing the stoppage of a rotary valve, a stable supply of solid fuel is ensured. The solid fuel supply apparatus comprises: a solid fuel supply pipe (63) for supplying solid fuel; the rotary valve (64) provided on the solid fuel supply pipe (63) and having a rotatable impeller (82); a detector (115) for detecting roll-in at the rotary valve (64); and a control device (65) which rotates the impeller (82) in the reverse direction over a predetermined period of time (Tb) when the detector (115) detects the roll-in, and then rotates the impeller in the forward direction.

Description

Solid fuel supply device and method and pulverizer, boiler {SOLID FUEL SUPPLY APPARATUS, SOLID FUEL SUPPLY METHOD, PULVERIZER AND BOILER}

The present invention relates to a solid fuel supply device and method, a pulverizer provided with the solid fuel supply device, and a boiler provided with the pulverizer.

The boiler has a furnace having a hollow shape and installed in the vertical direction, and a plurality of combustion devices (combustion burners) are arranged along the circumferential direction on the furnace wall. In the boiler, flue is connected upwardly in the vertical direction of the furnace, and a heat exchanger for generating steam is disposed in the flue. Then, a combustion burner injects a mixture of fuel and air into the furnace to form a flame, and a high-temperature combustion gas is generated and flows in the flue. The combustion gas flowing in the flue heats water or steam flowing in a plurality of heat transfer tubes constituting a heat exchanger to generate superheated steam.

In the boiler, solid fuel pulverized into a fine phase by the solid fuel supply device is supplied to the combustion burner. The solid fuel supply device includes a bunker, a fuel supply, a solid fuel supply pipe, a pulverizer (mill), and a fine fuel supply pipe. The fuel feeder supplies the solid fuel of the bunker from the solid fuel supply pipe to the grinder. The pulverizer pulverizes the solid fuel into a fine powder smaller than a predetermined particle diameter, and supplies it to the combustion burner from the fine fuel supply pipe.

In recent years, utilization of renewable energy is progressing, and application of biomass as a solid fuel is required. As a carbon-containing solid fuel, biomass fuels such as wood-based materials are difficult to finely pulverize, and have high combustibility and relatively large particle diameters, so that they can be suitably combusted. Therefore, when used as a solid fuel, biomass fuel is usually supplied to a combustion apparatus (combustion burner) provided in a boiler from a pulverizer in a state of a particle size of about 5 to 10 times larger than that of coal.

As described above, since coal and biomass fuels have different particle sizes when supplied to a combustion burner, pulverizers for pulverizing and classifying solid fuels are designed separately for biomass fuel crushing purposes and coal crushing purposes (eg For example, it is originally preferable that the housing shape, the rotational speed of the rotary table, the rotational speed of the classifier, etc.). However, from the standpoint of equipment cost and installation space, biomass fuel can be used by using the pulverizer capable of sharing coal and biomass fuel in response to both solid fuel of biomass fuel and coal with the same grinder. What is possible is desired.

The biomass fuel is a chip or pellet formed by compression molding wood chips or the like into a predetermined size, and has a constant particle size. Therefore, when the biomass fuel is stored in the down spout portion between the bunker and the fuel feeder, the gap formed between each biomass fuel becomes larger than that of coal fuel. The pulverizer performs drying and conveyance by supplying hot air to the biomass fuel when pulverizing the biomass fuel. Then, the hot air blown out from the inside of the grinder passes through this gap and exits into the bunker, and there is a concern that deterioration of conveyance of biomass fuel, generation of dust, ignition of the down spout portion, etc. may occur. Thus, by providing a rotary valve between the feeder and the fuel supply pipe, the sealing property is secured, and the backflow by blowing up hot gas from the crusher to the bunker is suppressed. Moreover, as what provided the rotary valve in a fuel supply part, there exist some described in patent document 1, for example.

Japanese Patent No. 4716217

The rotary valve has a structure in which the impeller is rotatably supported in the casing. The biomass fuel enters the space between the plurality of blades in the impeller, and is transported by rotating the impeller. The gap between the tip of the plurality of blades of the impeller and the inner surface of the casing is set narrow, and the sealability between them is secured. By the way, since the biomass fuel is compression molded of wood, etc., foreign materials such as fibers such as bark and debris of wood may be mixed in the production of biomass fuel. Therefore, when the impeller rotates, this fibrous or foreign matter may enter the gap between the tip of the blade and the inner surface of the casing. When the gap between the tip of the blade and the inner surface of the casing is fibrous of wood, the friction between them increases, so that curling may occur, and when the foreign matter entering the gap is hard, it is in the gap. In some cases, jamming and curling may occur. In these cases, there is a concern that the rotation of the impeller is inhibited and the operation of the rotary valve is stopped. When the operation of the rotary valve is completely stopped, biomass fuel cannot be supplied to the grinder, and the pulverizer generates pulverized fuel and cannot continuously convey it to the combustion burner, which may interfere with the stable operation of the boiler.

An object of the present invention is to provide a solid fuel supply device and method, and a pulverizer and a boiler, which solve the above-mentioned problems and secure the supply of solid fuel by suppressing the total stoppage of the rotary valve.

The solid fuel supply device of the present invention for achieving the above object, a solid fuel supply pipe for supplying solid fuel, a rotary valve having a rotatable impeller provided in the solid fuel supply pipe, and rolled in the rotary valve It is characterized in that it comprises a detector for detecting and a control device for rotating the impeller in a forward direction over a predetermined time when the detector detects the roll-in and then rotating in the forward direction.

Therefore, when the impeller of the rotary valve rotates in the forward direction to supply solid fuel by the solid fuel supply pipe, if the detector detects the curling in the rotary valve, the control device rotates the impeller in the reverse direction over a predetermined time. Afterwards, it rotates in the forward direction. That is, when the impeller rotates in the forward direction, when the fiber or foreign matter rolls into the gap between the tip end in the radial direction of the impeller and the inner surface (sealing surface) of the casing, the impeller is rolled in the reverse direction to rotate it. Lifting is eliminated, and the fibrous or foreign matter that has caused curling is accommodated in the transport space provided between the plurality of blades. Then, when the impeller is rotated in the forward direction after a lapse of a predetermined period of time, fibers or foreign substances accommodated in the conveying space portion of the impeller are appropriately supplied to the grinder by the solid fuel supply pipe together with the solid fuel without drying again. As a result, the total stoppage of operation of the rotary valve can be suppressed to ensure the supply of solid fuel.

In the solid fuel supply apparatus of the present invention, a pulverizer is provided in the solid fuel supply pipe on the downstream side in the supply direction of the solid fuel, and the predetermined time is greater than the crushing time of the solid fuel by the grinder is completed. It is characterized by being set in a short time.

Therefore, the grinder is held in the grinder while the impeller is rotated in the reverse direction due to the curling of the rotary valve in that the predetermined time is set to a time shorter than the crushing treatment of the solid fuel by the grinder is completed. The pulverized solid fuel can be continuously supplied to the pulverized fuel. After that, after the lapse of a predetermined time, the impeller is rotated in the forward direction, and before the pulverization treatment of the solid fuel held by the grinder is completed and the supply of the pulverized fuel is finished, the entanglement is resolved and the solid into the grinder is removed. The supply of fuel can be resumed, and the pulverized fuel can be continuously supplied.

In the solid fuel supply apparatus of the present invention, the predetermined time is characterized in that it is set to a time between 1/4 rotation and 1/2 rotation of the impeller.

Therefore, while the impeller is rotated from 1/4 turn to 1/2 turn in the reverse direction, the curling occurrence portion in the impeller has a state that is vertically higher than the horizontal position, and the fibrous or foreign matter that has curled has a plurality of blades. Gravity falls and is accommodated in the conveying space provided between. For this reason, since the predetermined time is set to a time between 1/4 rotation of the impeller and 1/2 rotation, it is easy to adhere the solid fuel to the inner surface of the sealing surface of the casing in order not to rotate in the reverse direction for a long time. While preventing, it is possible to quickly release the curling and resume the supply of solid fuel to the grinder.

In the solid fuel supply apparatus of the present invention, when the impeller rotates in the forward direction, the amount of the solid fuel accommodated in the conveying space portion provided between the plurality of blades is set to an amount smaller than the volume of the conveying space portion. Doing.

Therefore, the amount of solid fuel accommodated in the conveying space portion of the impeller can be adjusted, for example, by the amount of solid fuel supplied from the solid fuel supply pipe and the rotational speed of the impeller. When the amount of solid fuel accommodated in the conveying space portion of the impeller is set to an amount smaller than the volume of the conveying space portion, when the impeller is rotated due to rolling in the rotary valve and the impeller is rotated in the reverse direction, the fibrous or foreign matter that has been rolled into the impeller When this falls off, the dropped fibers or foreign matter can be accommodated in the conveying space, and when the impeller is rotated in the forward direction after a lapse of a predetermined time, the supply of solid fuel is resumed without the fibers or foreign matter being rolled back into the impeller. Can be.

In the solid fuel supply apparatus of the present invention, the amount of the solid fuel accommodated in the conveying space portion is set between 30% and 80% of the volume of the conveying space portion.

Therefore, since the amount of solid fuel accommodated in the conveying space portion is set to between 30% and 80% of the volume of the conveying space portion, it is possible to efficiently supply an appropriate amount of solid fuel and to cause curling that has fallen off from the impeller. Fibrous or foreign matter can be suitably accommodated in the conveying space.

In the solid fuel supply device of the present invention, further comprising an electric motor for driving and rotating the impeller, the detector detects the current value or power value of the electric motor, and the control device, the current value of the electric motor Alternatively, when the power value reaches a predetermined determination value, the impeller is rotated in the reverse direction over the predetermined time.

Therefore, when the electric current value or electric power value of the electric motor reaches the determination value, the detector detects it by rolling and rotates the impeller in the reverse direction. The detection of the curling of this detector is easy and reliable, and it is possible to detect the curling of fibers or foreign substances in the rotary valve based on the detection results using the current electric motor or electric current measuring detector. It can suppress the increase of the cost affecting the.

In the solid fuel supply device of the present invention, the control device is characterized in that the rotation of the impeller is stopped when the number of rotations of the impeller in the reverse direction exceeds a preset number of reversals.

Therefore, when the number of times the impeller is rotated in the reverse direction exceeds a predetermined number of reversals, by stopping the rotation of the impeller, by stopping the operation of the rotary valve when fibrous or foreign matter in the rotary valve is not resolved, The occurrence of damage or malfunction of the rotary valve can be suppressed in advance.

In the solid fuel supply device of the present invention, when the control device detects that the detector rolls in between the predetermined times when the impeller is rotated in the reverse direction over the predetermined time, the rotation of the impeller is stopped. It is characterized by.

Therefore, even when the impeller is rotated in the reverse direction over a predetermined time, when the detector detects the curling and the fibrous or foreign matter is not resolved, an abnormality such as the rotary valve itself other than the curling is considered. By stopping the operation of the rotary valve, the occurrence of damage or malfunction of the rotary valve can be suppressed in advance.

In the solid fuel supply apparatus of the present invention, a casing for rotatably supporting the impeller is further provided, and the casing is provided with an inspection hole.

Therefore, from the point of providing an inspection hole in the casing of the impeller, when the curling of the fibrous or foreign matter is not resolved even if the impeller is rotated in the reverse direction, after the operation of the rotary valve is stopped, the operator is rolled into the impeller through the inspection hole. Fibrous or foreign matter can be reliably removed and operation of the rotary valve can be resumed quickly.

In the solid fuel supply device of the present invention, a decomposable connection portion is provided on the upstream side in the supply direction of the solid fuel than the rotary valve in the solid fuel supply pipe.

Therefore, after providing a decomposable connecting portion on the upstream side of the rotary valve in the solid fuel supply pipe, after the impeller is rotated in the reverse direction, when the entrainment of fibers or foreign matter is not resolved, after the operation of the rotary valve is stopped, The operator can disassemble the connecting portion and open the inlet portion of the rotary valve to remove even large fibers or foreign substances that have been rolled into the impeller.

In the solid fuel supply apparatus of the present invention, a winding simulation switch is provided to output the winding signal regardless of the detection result of the detector.

Therefore, the operator can rotate the impeller in the reverse direction over a predetermined period of time, regardless of the detection result of the detector, by using the curling simulation switch, and even if the detector does not detect the curling, fibers or The slight curling of the foreign body is eliminated. In addition, an operation failure or the like can be found in advance by performing the trial operation of the impeller in advance.

In the solid fuel supply apparatus of the present invention, the forward rotation switch of the rotary valve, the reverse rotation switch of the rotary valve, and the display panel of the detector are arranged in the vicinity of the rotary valve.

Therefore, since the forward rotation switch, the reverse rotation switch, and the display half are arranged in the vicinity of the rotary valve, the operator can easily operate the forward rotation switch and the reverse rotation switch while looking at the display half.

In addition, the solid fuel supply method of the present invention, in the solid fuel supply device is provided with a rotary valve having an impeller rotatable in a solid fuel supply pipe for supplying solid fuel, by rotating the impeller to the solid fuel supply pipe Having a process of supplying fuel, a process of rotating the impeller in a reverse direction over a predetermined time when the curling is detected in the rotary valve, and a process of rotating the impeller in a forward direction after the lapse of the predetermined time. It is characterized by.

Therefore, when the impeller rotates in the forward direction, the fiber or foreign matter is rolled into the gap between the tip end in the radial direction of the impeller and the inner surface (sealing surface) of the casing, and the impeller is rotated in the reverse direction, thereby rotating the impeller in the reverse direction. The roll-up of the fibrous or foreign matter is eliminated, and the fibrous or foreign matter is accommodated in the conveying space portion provided between the plurality of blades. Then, when the impeller is rotated in the forward direction after a predetermined time has elapsed, the fibrous or foreign matter accommodated in the conveying space portion of the impeller is appropriately supplied by the solid fuel supply pipe together with the solid fuel without being re-dried. As a result, the total stoppage of operation of the rotary valve can be suppressed to ensure the supply of solid fuel.

Further, the pulverizer of the present invention is characterized in that it comprises the solid fuel supply device.

Therefore, solid fuel can be continuously supplied to the boiler.

In addition, the boiler of the present invention is characterized by comprising a solid fuel supply device.

Therefore, the solid fuel supply device can continuously supply the solid fuel to the boiler, and the boiler can continue stable operation.

According to the solid fuel supply apparatus and method of the present invention and the pulverizer and the boiler, it is possible to secure the supply of solid fuel by suppressing the total stoppage of the rotary valve.

1 is a schematic configuration diagram showing the boiler of the first embodiment.
2 is a schematic configuration diagram showing the solid fuel supply device of the first embodiment.
3 is a schematic view showing a rotary valve in a solid fuel supply device.
4 is a plan view showing an arrangement configuration of a rotary valve.
5 is a flow chart showing the operation of the solid fuel supply device.
6 is a schematic view showing a state where the foreign material is rolled into the rotary valve.
7 is a schematic diagram showing a reverse rotation state of the rotary valve.
8 is a schematic diagram showing a forward rotation state of the rotary valve.
9 is a flowchart showing the operation of the solid fuel supply device of the second embodiment.
10 is a time chart showing the operation of the solid fuel supply device.

Hereinafter, with reference to the accompanying drawings, a solid fuel supply apparatus and method according to the present invention and suitable embodiments of the boiler will be described in detail. In addition, this invention is not limited by this embodiment, Moreover, when there are multiple embodiments, what is comprised by combining each embodiment is also included.

[First Embodiment]

1 is a schematic configuration diagram showing the boiler of the first embodiment.

The boiler of the first embodiment uses, for example, pulverized fuel (carbon-containing solid fuel) that has crushed biomass, combusts the pulverized fuel with a combustion burner, recovers heat generated by the combustion, and supplies water. It is a pulverized fuel combustion boiler capable of heat-exchanging steam to produce superheated steam. In the following description, the upper side, the upper side, or the upper side represents the upper side in the vertical direction, and the lower side, the lower side or the lower side represents the lower side in the vertical direction.

In the first embodiment, as shown in FIG. 1, the boiler 10 has a furnace 11, a combustion device 12, and a flue 13. The furnace 11 is formed in a hollow shape of four cylinders and is provided along the vertical direction. The furnace wall (heat transfer tube) constituting the furnace 11 is composed of a plurality of evaporation tubes and fins connecting them, and the temperature of the furnace wall is suppressed by heat exchange with feed water or steam.

The combustion device 12 is provided on the lower side of the furnace wall constituting the furnace 11. In the present embodiment, the combustion device 12 has a plurality of combustion burners (for example, 21, 22, 23, 24, 25) mounted on the furnace wall. For example, in each of the combustion burners 21, 22, 23, 24, and 25, a plurality of burners arranged at equal intervals along the circumferential direction is set as one set, and a set of them is a plurality along the vertical direction. It is arranged as a stage. However, the shape of the furnace and the number and number of combustion burners in one stage are not limited to this embodiment.

Each combustion burner (21, 22, 23, 24, 25) is connected to a grinder (mill) (31, 32, 33, 34, 35) through a fine fuel supply pipe (26, 27, 28, 29, 30) have. Although the grinders 31, 32, 33, 34, and 35 are not shown, for example, a rotary table is supported rotatably in its housing, and a plurality of rollers are provided to rotate the rotary table above the rotary table. It has a configuration that is rotatably supported in conjunction. When the solid fuel is injected between the plurality of rollers and the rotary table, the pulverized fuel is pulverized to the size of a predetermined pulverized fuel, and the obtained pulverized fuel is classified by conveying gas (primary air) so that the fine fuel supply pipes 26 and 27 , 28, 29, 30) to the combustion burners 21, 22, 23, 24, 25.

In addition, the furnace 11 is provided with an air phase 36 at the mounting position of each combustion burner 21, 22, 23, 24, 25, and one end of the air duct 37 is connected to the air phase 36. have. The air duct 37 is provided with a blower 38 at the other end.

Moreover, the furnace 11 is provided with the national air nozzle 39 above the installation position of each combustion burner 21, 22, 23, 24, 25. An end portion of the branch air duct 40 branched from the air duct 37 is connected to the national air nozzle 39. Accordingly, the combustion air (fuel gas combustion air/secondary air) sent by the blower 38 is supplied from the air duct 37 to the wind phase 36, and each combustion burner 21 is also supplied from the air phase 36. , 22, 23, 24, 25) and additional air for combustion (additional air) sent by the blower 38 from the branch air duct 40 to the local air nozzle 39. have.

The flue 13 is connected to the upper portion in the vertical direction of the furnace 11. In the flue 13, superheaters 41, 42, 43, reheaters 44, 45, and economizers 46, 47 are provided as heat exchangers for recovering the heat of the combustion gas, and the furnace 11 Heat exchange is performed between the combustion gas generated by combustion at and the feed water or steam flowing through each heat exchanger.

A gas duct 48 through which heat exchanged combustion gas is discharged is connected to the flue 13. The air heater (air preheater) 49 provided between the gas duct 48 and the air duct 37 exchanges heat between the air flowing through the air duct 37 and the combustion gas flowing through the gas duct 48, Thus, the combustion air supplied to the combustion burners 21, 22, 23, 24 and 25 can be heated.

In addition, the denitration catalyst 50 is provided in the flue 13 at a position upstream of the air heater 49. The denitration catalyst 50 supplies a reducing agent having a function of reducing nitrogen oxides such as ammonia and urea water in the flue 13, and promotes the reaction of the nitrogen oxide and the reducing agent in the combustion gas supplied with the reducing agent, It is to remove and reduce nitrogen oxides in the combustion gas. In addition, the gas duct 48 connected to the flue 13 is provided with a dust treatment device (electrostatic precipitator, desulfurization device) 51, a manned blower 52, and the like at a position downstream from the air heater 49. , The flue 53 is provided at the downstream end.

On the other hand, when the grinders 31, 32, 33, 34, and 35 are driven, the generated pulverized fuel is burned through the pulverized fuel supply pipes 26, 27, 28, 29, 30 together with the conveying air. , 23, 24, 25). In addition, heated combustion air is supplied from the air duct 37 to the respective combustion burners 21, 22, 23, 24, 25 through the air phase 36. Then, the combustion burners 21, 22, 23, 24 and 25 blow the powdered fuel mixture in which the powdered fuel and the conveying gas (primary air) are mixed into the furnace 11, and inject the combustion air into the furnace ( 11) can be blown and ignited at this time to form a flame. A flame occurs in the lower part of the furnace 11, and combustion gas rises in the furnace 11, and is discharged to the flue 13.

In the furnace 11, in the lower region A, the fine fuel mixture and the combustion air (secondary air) are burned to generate a flame. Here, the furnace 11 is set so that the supply amount of air is less than the theoretical air amount with respect to the supply amount of fine fuel, so that the inside is maintained in a reducing atmosphere. That is, in the region B, NOx generated by combustion of the fine fuel is reduced in the furnace 11, and thereafter, oxidative combustion of the fine fuel is completed by additional supply of the local air from the local air nozzle 39, The amount of NOx generated by combustion of the fine fuel is reduced.

Thereafter, the combustion gas is exchanged with the denitration catalyst 50 after heat exchange by superheaters 41, 42, 43, reheaters 44, 45, and cutters 46, 47 arranged in the flue 13. The nitrogen oxides are reduced and removed, and after the particulate matter is removed from the exhaust treatment device 51, sulfur is removed, and then discharged from the stack 53 to the atmosphere.

2 is a schematic configuration diagram showing the solid fuel supply device of the first embodiment.

In the first embodiment, as shown in FIG. 2, the solid fuel supply device 60 supplies solid fuel such as biomass to the grinder 31 (32, 33, 34, 35). The grinder 31 pulverizes the supplied solid fuel, generates pulverized fuel, and supplies it to the combustion device 12 of the boiler 1. The pulverizer 31 for pulverizing solid fuel such as coal or biomass fuel supplied to the boiler 1 into pulverized solid fuel, may be a type of pulverizing only coal or a type of pulverizing only biomass fuel. In addition, the biomass fuel may be pulverized together with coal.

The solid fuel supply device 60 includes a bunker 61, a fuel supply 62, a solid fuel supply pipe 63, a rotary valve 64, a grinder 31, and a fine fuel supply pipe 26 ( 27, 28, 29, 30) and a control device 65.

In this embodiment, the bunker 61 stores biomass fuel as solid fuel. The bunker 61 is provided with a down spout portion 71 directly below. Here, the biomass fuel is an organic resource derived from renewable organisms, for example, thin material, waste wood, driftwood, grass, waste, mud, tires, and recycled fuels (pellets or chips) using these as raw materials. It is not limited to what is presented. Biomass fuel is a carbon neutral that does not emit carbon dioxide, which is a global warming gas, in terms of introducing carbon dioxide in the process of fostering biomass, and various uses thereof have been studied.

In addition, the fuel supplied to the boiler 10 is not limited to biomass fuel, and may be coal or a mixed fuel of coal and biomass.

The fuel feeder 62 includes a conveying section 72 and an electric motor 73. The conveying part 72 conveys the solid fuel discharged from the lower end of the down spout part 71 immediately below the bunker 61 by the driving force applied from the electric motor 73, and the solid fuel supply pipe 63 To supply. The amount of solid fuel supplied to the solid fuel supply pipe 63 is adjusted to the belt speed of the belt conveyor constituting the conveying unit 72.

The solid fuel supply pipe 63 is disposed between the fuel supply 62 and the grinder 31. The solid fuel supply pipe 63 is composed of an upper fuel supply pipe 74 and a lower fuel supply pipe 75. The upper end of the upper fuel supply pipe 74 is connected to the fuel supply 62, and the lower end of the lower fuel supply pipe 75 is connected to the grinder 31. In addition, a rotary valve 64 is provided between the upper fuel supply pipe 74 and the lower fuel supply pipe 75. The rotary valve 64 is connected to the lower end of the upper fuel supply pipe 74 through the upper connection portion (connection portion) 76, and is connected to the upper portion of the lower fuel supply pipe 75 through the lower connection portion 77. The upper fuel supply pipe 74 is a disassembled upper connection 76, and a sleeve joint is applied. The sleeve joint has, for example, a cylinder portion that covers a connection portion with an upper portion of the upper pipe (not shown) that connects to the upper fuel supply pipe 74 and the supply port 92 of the rotary valve 64, and the cylinder portion from the outer peripheral side. The connection is fixed by fastening with a tightening band (tightening fixture). Disassembly of the upper connection portion 76 is achieved by loosening or removing the tightening bands fastening the cylinder portion of the sleeve joint, and then sliding the cylinder portion of the sleeve joint upward or downward. The rotary valve 64 includes a casing 81, an impeller 82, and an electric motor 83.

The chips and pellets of the biomass fuel before pulverization have a constant particle size (for example, about 6 to 8 mm in diameter and 40 mm or less in length) and lighter weight than that of coal fuel. For this reason, when the biomass fuel is stored in the down spout portion 71, the gap formed between each biomass fuel is larger than that of the coal fuel. Then, since there is a gap between the biomass fuel chips or pellets in the down spout portion 71, the primary air and the fine fuel blowing out from the inside of the grinder 31 pass through the gap formed between each biomass fuel, , Thereby, there is a possibility that the internal pressure of the grinder 31 is lowered. In addition, when the primary air flows into the reservoir of the bunker 61, deterioration of the conveyance of biomass fuel or generation of dust, ignition of the down spout portion 71 occurs, and also, the internal pressure of the grinder 31 When this decreases, various problems may occur in the operation of the grinder 31, such as a decrease in the conveyed amount of the fine fuel. For this reason, the rotary valve 64 is provided in the solid fuel supply pipe 63, and the backflow by blowing up primary air and fine fuel is suppressed.

Although not shown, the grinder 31 is provided with a rotating table, a roller, and a classifier inside the housing. When the solid fuel supplied from the solid fuel supply pipe 63 is input to the center of the rotary table, the solid fuel is guided to the outer circumferential side of the rotary table by centrifugal force by rotation of the rotary table, and sandwiched between rollers to be crushed. The pulverized solid fuel becomes a pulverized solid fuel, and is wound upward by primary air as a transport gas. Of the pulverized solid fuels that have reached the classifying section, the coarse-grained fuel of a large diameter is struck and dropped by the classifying blade due to the relative balance of centrifugal force generated by rotation of the classifying blade and aroma force due to air flow in the primary air. , It is returned to the rotary table and crushed again, and the pulverized fuel is led from the housing to the pulverized fuel supply pipe 26 and discharged. The fine fuel discharged into the fine fuel supply pipe 26 is supplied to the combustion device 12 of the boiler 10.

The control device 65 controls the operation of the fuel supply 62, the rotary valve 64, and the grinder 31. That is, the control device 65 adjusts the supply amount of the solid fuel to the upper fuel supply pipe 74 by controlling the operating speed of the conveying section 72 by the electric motor 73 of the fuel supply 62. The control device 65 controls the rotational speed of the impeller 82 by the electric motor 83 of the rotary valve 64 to adjust the amount of solid fuel supplied to the lower fuel supply pipe 75. The control device 65 can adjust the amount of supply of the fine fuel to the fine fuel supply pipe 26 by controlling the pulverizer 31.

Further, the control device 65 is configured of, for example, a central processing unit (CPU), random access memory (RAM), read only memory (ROM), and a computer-readable storage medium. In addition, a series of processes for realizing various functions are stored in a storage medium or the like in the form of a program as an example, and the CPU reads the program into a RAM or the like to perform processing and arithmetic processing of information to perform various functions. Is realized. In addition, the program may be applied in a form previously installed in a ROM or other storage medium, a form provided in a state stored in a computer-readable storage medium, or a form distributed through communication means by wire or wireless. . Computer-readable storage media are magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, and semiconductor memories.

3 is a schematic view showing a rotary valve in a solid fuel supply device, and FIG. 4 is a plan view showing an arrangement configuration of the rotary valve.

3 and 4, the rotary valve 64 in this embodiment includes a casing 81, an impeller 82, and an electric motor 83. In the casing 81, an impeller 82 is disposed inside, and the impeller 82 is rotatably supported by the casing 81 by a rotation shaft 91. The casing 81 is provided with a supply port 92 for supplying solid fuel F to the impeller 82 at the top, while an exhaust port 93 for discharging solid fuel F from the impeller 82 is provided at the bottom. . The impeller 82 has a shaft support 94, a plurality of (for example, eight in this embodiment) blades 95, and two rotating plates 96. The shaft support part 94 is provided with a rotating shaft 91 integrally. The shaft support portion 94 is provided with a plurality of blades 95 at regular intervals in the circumferential direction. The two rotating plates 96 are the outer circumferential portions of the shaft support portion 94, and are provided on both sides of the plurality of blades 95 (front and rear directions in FIG. 3). Therefore, the impeller 82 has a plurality of (8 in the present embodiment) conveyance space portion 97 along the circumferential direction by the shaft support portion 94, each blade 95, and each rotating plate 96. Is prepared.

In addition, the casing 81 is provided with a sealing surface 98 forming an arc shape along the outer circumference of the impeller 82 between the supply port 92 and the discharge port 93. A predetermined gap is secured between the outer periphery of the impeller 82, that is, the outer periphery of the blade 95 and the rotating plate 96 and this sealing surface 98. The length of the sealing surface 98 in the circumferential direction is set to be longer than the distance in the outer circumferential direction of the adjacent blades 95, that is, the length in the outer circumferential direction in one conveyance space portion 97. Therefore, in the rotary valve 64, a sealing function is formed between the outer periphery of the impeller 82 and the sealing surface 98 of the casing 81, and 1 from the discharge port 93 side to the supply port 92 side. Backflow by blowing up air and fine fuel is suppressed.

In the casing 81, the support 101 is fixed to one side, and the electric motor 83 is fixed on the support 101. In the electric motor 83, the drive sprocket 103 is fixed to the output shaft 102. The driven sprocket 104 is fixed to the rotating shaft 91 of the impeller 82. An endless drive chain 105 is hung and wound between the drive sprocket 103 and the driven sprocket 104. Therefore, when the electric motor 83 is driven, the rotational force of the output shaft 102 is transmitted to the rotation shaft 91 through the drive sprocket 103, the drive chain 105, and the driven sprocket 104, and thus the rotary valve 64 ), the impeller 82 rotates in the forward or reverse direction. In this embodiment, the counterclockwise direction of the ground of Fig. 3 is the forward rotation of the rotary valve 64, and the clockwise direction of the ground of Fig. 3 is the reverse rotation.

The control panel 110 that drives and controls the electric motor 83 may be disposed in the vicinity of the rotary valve 64. The control panel 110 has a control device 65 (see FIG. 2 ), and the power supply unit 111 is connected. The control panel 110 is provided with a power switch 112 of the rotary valve 64, a forward rotation switch 113 of the rotary valve 64, and a reverse rotation switch 114 of the rotary valve 64. Further, a detector 115 for detecting the current value (or power value) of the electric motor 83 is provided, and the control panel 110 displays the current value of the electric motor 83 detected by the detector 115. The display panel 116 is provided.

Moreover, as shown in FIGS. 2 and 3, in the solid fuel supply device 60 of the first embodiment, as an detector that detects the occurrence of curling or foreign matter in the rotary valve 64, an electric motor The detector 115 that detects the current value of 83 functions. The detector 115 may detect the electric power value of the electric motor 83. When the detector 115 detects the fibrous or foreign matter is rolled, the control device 65 rotates the impeller 82 of the rotary valve 64 in the reverse direction over a predetermined time, and then rotates in the forward direction.

In addition, in the radial tip of the blade 95 in the present embodiment, the radial tip of the blade in the reverse rotation direction forms an inclined surface, and has a sharp shape. Thereby, the space of the gap formed by the radial end of the sealing surface 98 and the blade 95 of the casing 81 is reduced, and solid fuel (eg, mainly undifferentiated solid fuel) entering the gap is reduced. By reducing the amount, the rotational resistance of the impeller 82 can be reduced. On the other hand, if the tip of the radial direction on the side in the reverse rotation direction of the blade 95 is an inclined surface and has a sharp shape, if the impeller 82 is continuously used in reverse rotation, the diameter on the reverse side of the blade 95 By the inclined surface of the direction tip, a force that strongly presses the solid fuel on the sealing surface 98 side of the casing 81 acts. For this reason, when the impeller 82 is rotated in the reverse direction over a long period of time, the solid fuel may easily adhere to the inner surface of the sealing surface 98 of the casing 81. Therefore, in the rotary valve 64 in this embodiment, it is preferable that the rotation direction of the impeller 82 is rotated in the forward rotation direction without continuing the reverse rotation direction for a long time.

That is, since the biomass fuel used as a solid fuel is compression molded of wood chips or the like, there may be cases in which fibers such as bark or foreign matter such as wood chips are mixed. In addition, other foreign matter may be mixed into the solid fuel. When fibers or foreign substances are mixed into the solid fuel, when the impeller 82 is rotated, fibers or foreign substances are rolled into the gap between the casing 81 and the impeller 82, and rotation of the impeller 82 is inhibited. Thus, the solid fuel supply device 60 of the first embodiment, when the fibrous or foreign matter rolls into the rotary valve 64, rotates the impeller 82 in the reverse direction, thereby casing 81 and impeller 82 ) To remove any fibers or foreign substances that have been rolled into the gap.

In this case, the detector 115 rotates the impeller 82 in the reverse direction over a predetermined time when it detects that the current value of the electric motor 83 has reached a predetermined determination value. The determination value is preferably, for example, a rated current value of the electric motor 83, but may be a current value higher than the starting current value of the electric motor 83. The detector 115 may detect a power value other than the current value of the electric motor 83.

In addition, when the time for performing the rotation in the reverse direction becomes longer, when the impeller 82 is rotated in the reverse direction, the solid fuel may easily adhere to the inner surface of the sealing surface 98 of the casing 81, so that it is a predetermined time. Is set to a short time. That is, the rotary valve 64 supplies solid fuel to the grinder 31 by the solid fuel supply pipe 63, and the grinder 31 uses the pulverized fine fuel to the combustion device ( 12). When the impeller 82 is rotated in the reverse direction due to curling, when the impeller 82 is rotated in the reverse direction over a long period of time, solid fuel is easily attached to the inner surface of the sealing surface 98 of the casing 81 Specifically, it is preferable to set the predetermined time to a time between the impeller 82 and the quarter turn from 1/2 turn. While the impeller 82 is rotated from 1/4 turn to 1/2 turn in the reverse direction, the curling occurrence portion of the impeller 82 is in a state that is vertically higher than the horizontal position, and the fibrous or foreign matter that has curled. Silver is accommodated by gravity dropping into the conveying space portion 97 provided between the plurality of blades 95.

In addition, the rotary valve 64 is provided with a transport space portion 97 into which solid fuel enters. When the impeller 82 rotates in the forward direction, it is preferable that the amount of solid fuel accommodated in the conveying space portion 97 is set to an amount smaller than the volume of the conveying space portion 97. That is, as described above, when rotating the impeller 82 in the reverse direction, the same configuration as the fibrous or foreign matter removed from the gap between the casing 81 and the impeller 82 is accommodated in the conveying space portion 97. to provide. Specifically, the amount of solid fuel accommodated in the conveying space portion 97 is preferably set between 30% and 80% of the volume of the conveying space portion 97. In this case, since the amount of the solid fuel supplied to the grinder 31 is set in advance, this value is used as the amount of solid fuel accommodated in the conveyance space portion 97, and is designed at the time of designing the impeller 82. It can be set by adjusting the outer diameter to be determined. In addition, the numerical value can be set, for example, by adjusting the supply amount of the solid fuel supplied from the upper fuel supply pipe 74 by the fuel feeder 62 and the rotational speed of the impeller 82.

In addition, even if the impeller 82 is rotated in the reverse direction, the operator stops the rotation of the impeller 82 when fibrous or foreign matter is not removed from the gap between the casing 81 and the impeller 82 and curling is not resolved. And, it is preferable to remove the fibers or foreign substances that have been rolled into the gap between the casing 81 and the impeller 82. Therefore, the inspection tool 121 is provided in the casing 81. In the casing 81, an inspection port 121 communicating with the supply port 92 is provided on the side, and the waste paper cover 122 is fixed to the inspection port 121 and is closed.

In addition, the control device 65, when the detector 115 detects that the foreign matter is curled, rotates the impeller 82 in the reverse direction over a predetermined time and then rotates in the forward direction, but this operation can be simulated in advance. Is supposed to. That is, a curling simulation switch 123 is provided to output a curling detection signal to the control device regardless of the detection result of the detector 115. The curling simulation switch 123 is provided on the control panel 110, and even if the detector 115 does not detect curling, slight curling of fibers or foreign matter can be eliminated. Further, after rotating the impeller 82 in the reverse direction over a predetermined time, a series of operations for rotating in the forward direction and control therebetween can be simulated.

Here, the solid fuel supply method by the solid fuel supply device 60 of the first embodiment will be described. Fig. 5 is a flow chart showing the operation of the solid fuel supply device, Fig. 6 is a schematic diagram showing a state in which the foreign matter is rolled into a rotary valve, and Fig. 7 is a schematic diagram showing a reverse rotation state of the rotary valve, Fig. 8 Is a schematic diagram showing a forward rotation state of the rotary valve.

The solid fuel supply method of the first embodiment is a process of supplying solid fuel by the solid fuel supply pipe 63 by rotating the impeller 82, and the impeller 82 when detecting the curling in the rotary valve 64 It has a process of rotating in the reverse direction over a predetermined time set in advance, and a process of rotating the impeller 82 in the forward direction after the lapse of a predetermined time.

3 and 5, in step S11, the control device 65 starts the rotary valve 64, and in step S12, the impeller 82 is rotated in the forward direction by the electric motor 83. Order. That is, the impeller 82 is forwarded by driving the electric motor 83 and transmitting the rotational force of the output shaft 102 to the rotating shaft 91 through the driving sprocket 103, the driving chain 105, and the driven sprocket 104. Rotates. The predetermined amount of solid fuel F conveyed from the fuel supply 62 is supplied into the casing 81 from the supply port 92. In the impeller 82 rotating at a predetermined rotational speed, a solid fuel F in an amount smaller than the volume of the conveying space portion 97 is accommodated in the conveying space portion 97. At this time, a sealing function is secured between the outer peripheral portion of the impeller 82 and the sealing surface 98 of the casing 81. And the solid fuel F accommodated in the conveyance space part 97 is conveyed downward by the rotation of the impeller 82, and is discharged|emitted from the discharge port 93.

In step S13, the current value (or power value) of the electric motor 83 is input to the control device 65 from the detector 115. The control device 65 determines whether or not the current value of the electric motor 83 input from the detector 115 has reached the determination value (rated current value (or rated power value)). In this case, the control device 65 determines the time at which the current value (or power value) of the electric motor 83 input from the detector 115 reaches the determination value, which is a predetermined determination time (for example, 0.5 second). (1.0 seconds) or more. Here, if it is determined ("No") that the electric motor 83's current value (or power value) is lower than the determination value, the routine is exited without doing anything.

On the other hand, if it is determined ("YES") that the current value (or power value) of the electric motor 83 is equal to or greater than the determination value, in step S14, the control device 65 uses the electric motor 83 to impeller 82. Rotate in the reverse direction. 5 and 6, when the fibrous or foreign material F1 rolls between the impeller 82 and the casing 81 that rotate in the forward direction, the impeller 82 cannot rotate in the forward direction and the electric motor 83 The load acts on the current value (or power value) to increase. When the electric current value (or electric power value) of the electric motor 83 rises above the determination value, the control device 65 has fibrous or foreign matter F1 rolled between the impeller 82 and the casing 81 and rolled up. It is presumed to have occurred. And, at this time, as shown in FIGS. 5 and 7, when the impeller 82 is rotated in the reverse direction by the electric motor 83, the fibrous or foreign matter F1 that has been rolled between the impeller 82 and the casing 81 is rolled. This fall off and falls in the conveyance space portion 97 of the impeller 82 and is accommodated.

In step S15, the control device 65 determines whether the predetermined time Tb has elapsed since the impeller 82 rotates in the reverse direction. Here, if it is determined that the predetermined time Tb has not elapsed since the impeller 82 rotates in the reverse direction ("No"), the process returns to step S14. On the other hand, if it is determined that the predetermined time Tb has elapsed since the impeller 82 rotates in the reverse direction ("YES"), in step S16, the control device 65 forwards the impeller 82 by the electric motor 83. Rotates. Then, as shown in FIGS. 5 and 8, the fibrous material or foreign matter F1 that has been rolled between the impeller 82 and the casing 81 falls off, and is accommodated in the conveying space portion 97 of the impeller 82. In this respect, the curling between the impeller 82 and the casing 81 is eliminated, and the impeller 82 can rotate in the forward direction and resume supply of solid fuel F.

In this way, in the solid fuel supply device of the first embodiment, the rotary valve 64 having a solid fuel supply pipe 63 for supplying solid fuel, an impeller 82 rotatable provided in the solid fuel supply pipe 63, and a rotary The detector 115 that detects the roll-in of the fibrous or foreign material F1 in the valve 64, and when the detector 115 detects the roll-in, rotates the impeller 82 in the reverse direction over a predetermined time Tb, and then forwards. It is provided with a control device 65 for rotating.

Therefore, when the impeller 82 is rotated in the forward direction, when the fibrous or foreign matter F1 is rolled into the impeller 82, it is detected to be rolled up, and the impeller 82 is rotated in the reverse direction, thereby causing the impeller 82 to curl. The entry is eliminated, and the fibrous or foreign matter F1 falls off and is accommodated in the transport space portion 97. Then, when the impeller 82 is rotated in the forward direction after the lapse of a predetermined time Tb, the fibrous or foreign matter F1 accommodated in the conveying space portion 97 of the impeller 82 is rolled back between the impeller 82 and the casing 81. Without entering, the solid fuel F is properly supplied to the grinder 31 by the solid fuel supply pipe 63. As a result, the total stoppage of the operation of the rotary valve 64 can be suppressed to ensure the supply of solid fuel F.

In the solid fuel supply device of the first embodiment, the predetermined time Tb for rotating in the reverse direction is set to a time shorter than the time when the pulverization processing of the solid fuel F by the grinder 31 is completed. Therefore, while the fibrous or foreign matter F1 is rolled in the rotary valve 64 and the impeller 82 is rotated in the reverse direction, the pulverizer 31 continues to pulverize the fine fuel generated by pulverizing the solid fuel F. It can be supplied to the fine fuel supply pipe 26. After that, after the elapse of the predetermined time Tb, the impeller 82 is rotated in the forward direction, and before the crushing treatment of the solid fuel F by holding in the grinder 31 is completed, the entanglement is eliminated and the grinder 31 is removed. The supply of solid fuel F to the furnace can be resumed, and the pulverized fuel can be continuously supplied from the pulverized fuel supply pipe 26.

In the solid fuel supply device of the first embodiment, the predetermined time Tb is set to a time between 1/4 rotation and 1/2 rotation of the impeller 82. Therefore, while the impeller 82 is rotated from 1/4 rotation to 1/2 rotation in the reverse direction, the portion where the curling occurs in the impeller 82 is in a state that is vertically higher than the horizontal position, and the fiber that has curled is generated. Alternatively, the foreign matter F1 is gravitated to the transport space portion 97 provided between the plurality of blades 95 to be accommodated. For this reason, since the rotation in the reverse direction is not performed for a long time, the curling is quickly eliminated and the solid fuel F to the grinder 31 is prevented, while preventing the solid fuel from being easily attached to the inner surface of the sealing surface 98 of the casing 81. Can resume supply.

In the solid fuel supply device of the first embodiment, when the impeller 82 is rotated in the forward direction, the amount of solid fuel F accommodated in the conveying space portion 97 is set to an amount smaller than the volume of the conveying space portion 97. have. Therefore, when the fibrous or foreign matter F1 is rolled in the rotary valve 64 and the impeller 82 is rotated in the reverse direction, if the fibrous or foreign matter F1 rolled into the impeller 82 falls off, the fallen fibrous or foreign matter F1 Can be accommodated in the conveying space 97, and when the impeller 82 is rotated in the forward direction after the elapse of a predetermined time Tb, the supply of solid fuel F without fibrous or foreign matter F1 being rolled back into the impeller 82 Can resume.

In the solid fuel supply device of the first embodiment, the amount of solid fuel F accommodated in the conveying space portion 97 is set between 30% and 80% of the volume of the conveying space portion 97. Therefore, the appropriate amount of solid fuel F can be efficiently supplied, and the fibrous or foreign matter F1 that has fallen off from the gap between the impeller 82 and the sealing surface 98 that has been rolled up is appropriately accommodated in the conveying space portion 97. can do.

In the solid fuel supply device of the first embodiment, when the current value or power value of the electric motor 83 detected by the detector 115 reaches a predetermined determination value, the control device 65 applies the impeller 82. It rotates in the reverse direction over a predetermined time Tb. Therefore, it is possible to quickly and accurately detect the roll-in of the fibrous or foreign matter F1 in the rotary valve 64 based on the detection result of the existing detector 115, and increase the cost affecting the detector 115 Can be suppressed.

In the solid fuel supply device of the first embodiment, an inspection tool 121 is provided on the casing 81 that rotatably supports the impeller 82. Therefore, even when the impeller 82 is rotated in the reverse direction, when the roll-in of the foreign material F1 is not resolved, after the operation of the rotary valve 64 is stopped, the operator is rolled into the impeller 82 through the inspection hole 121. Fibrous or foreign matter F1 can be removed.

In the solid fuel supply device of the first embodiment, a decomposable upper connection portion 76 is provided on the upstream side of the solid fuel F supply direction than the rotary valve 64 in the solid fuel supply pipe 63. Therefore, even when the impeller 82 is rotated in the reverse direction, when the curling of the foreign material F1 is not resolved, after the operation of the rotary valve 64 is stopped, the operator can disassemble the upper connection part 76 (for example, a sleeve By disassembling the joint) and opening the portion of the supply port 92 of the rotary valve 6, even large fibers or foreign matter F1 rolled into the impeller 82 can be removed.

In the solid fuel supply device of the first embodiment, a curling simulation switch 123 is provided for the control device 65 to output a curling signal regardless of the detection result of the detector 115. Therefore, even if the detector 115 does not detect the curling by the curling simulation switch 123, the operator can eliminate the slight curling of the fibrous or foreign matter F1. In addition, regardless of the detection result of the detector 115, a curling signal is simulated and a series of operations and controls for rotating the impeller 82 in a reverse direction over a predetermined time and then rotating in a forward direction can be simulated. By performing the trial run of the impeller 82, it is possible to find out the malfunction of the rotary valve 64 in advance.

In the solid fuel supply device of the first embodiment, the forward rotation switch 113 of the rotary valve 64, the reverse rotation switch 114 of the rotary valve 64, and the display panel 116 of the detector 115 are rotary. It is arranged in the vicinity of the valve 64. Therefore, for example, when a large fiber or foreign material F1 is rolled in, and when the impeller 82 is rotated in the direction of either forward or reverse when working by turning the inspection tool 121 or the upper connection part 76, the operator can display the display panel 116 ), the forward rotation switch 113 and the reverse rotation switch 114 can be easily operated.

In the solid fuel supply method of the first embodiment, the process of supplying the solid fuel F by the solid fuel supply pipe 63 by rotating the impeller 82 and the fibrous or foreign matter F1 in the rotary valve 64 When the roll-in is detected, the impeller 82 is rotated in a reverse direction over a predetermined time Tb, and a process of rotating the impeller 82 in a forward direction after a predetermined time Tb has elapsed. Therefore, the total stoppage of the operation of the rotary valve 64 can be suppressed to ensure the supply of solid fuel F.

In addition, the pulverizer of the first embodiment includes a solid fuel supply device 60. Therefore, the solid fuel F can be continuously supplied to the boiler 10.

Further, in the boiler of the first embodiment, a solid fuel supply device 60 is provided. Therefore, the solid fuel supply device 60 can continue to supply the solid fuel F to the boiler 10, and can continue the stable operation of the boiler 10.

[Second Embodiment]

9 is a flowchart showing the operation of the solid fuel supply device of the second embodiment, and FIG. 10 is a time chart showing the operation of the solid fuel supply device. In addition, the basic configuration of the solid fuel supply device of the second embodiment is the same as that of the solid fuel supply device 60 of the first embodiment described above, which will be described with reference to FIGS. 2 and 3, and the first embodiment described above. The same code|symbol is attached|subjected to the member which has a function similar to a form, and detailed description is abbreviate|omitted.

In the solid fuel supply device 60 of the second embodiment, as shown in Figs. 9 and 10, the control device 65, the number of times to rotate the impeller 82 in the reverse direction exceeds a predetermined number of predetermined reversals. When it does, rotation of the impeller 82 stops. When the detector 115 detects that the detector 115 is rolled, the control device 65 rotates the impeller 82 in the reverse direction over a predetermined time Tb, and then rotates it in the forward direction, but the rotary valve 64 is rotated by this rolling operation. When the curling in Esau is not resolved, the reversing of the impeller 82 and the forward rotation of the forward rotation are repeatedly performed. At this time, the control device 65 stops the rotation of the impeller 82 within a predetermined time, if the rotational movement of the impeller 82 exceeds a predetermined number of reversals (for example, 3 times). That is, even if the rolling motion of the impeller 82 is repeatedly performed, if the curling is not resolved, the rotation of the impeller 82 is stopped, and the fibrous or foreign material F1 that is manually rolled into the impeller 82 by an operator Remove it.

In addition, when rotating the impeller 82 in the reverse direction over a predetermined time Tb, the control device 65 stops the rotation of the impeller 82 if it detects that the detector 115 rolls in between the predetermined time Tb. . When the control device 65 detects that the detector 115 is rolled in, the impeller 82 is rotated in the reverse direction over a predetermined time Tb, but the reverse rotation operation causes the impeller 82 to become fibrous or foreign. When rolled in, the rotation of the impeller 82 is stopped. That is, even when the reverse rotation operation of the impeller 82 is performed, if the curling is not resolved, the rotation of the impeller 82 is stopped, and the operator manually removes the fibrous or foreign matter F1 that has been rolled into the impeller 82. .

Specifically, as shown in FIG. 9, in step S21, the control device 65 starts the rotary valve 64, and in step S22, the impeller 82 is forwarded by the electric motor 83. Rotates. Then, the solid fuel F conveyed from the fuel supply 62 and supplied into the casing 81 from the supply port 92 is accommodated in the conveying space portion 97 of the impeller 82 rotating at a predetermined rotational speed, By the rotation of the impeller 82, it is conveyed downward and discharged from the discharge port 93.

In step S23, it is determined whether or not the forward rotation duration time (forward rotation time) of the impeller 82 has exceeded a predetermined time Ta (for example, 10 seconds). Here, if it is determined that the forward rotation time of the impeller 82 does not exceed the predetermined time Ta ("No"), in step S24, the control device 65, the electric motor 83 input from the detector 115 It is determined whether or not the current value (or power value) of has reached the determination value (rated current value (or rated power value)). Here, if it is determined ("No") that the electric motor 83's current value (or power value) is lower than the determination value, the routine is exited without doing anything.

On the other hand, if it is determined ("YES") that the current value (or power value) of the electric motor 83 is greater than or equal to the determination value, in step S25, the control device 65 rotates the impeller 82 in the reverse direction ( It is determined whether or not the number of times of reversal has exceeded a predetermined number of times of reversal (for example, three times). Here, if it is determined that the number of times of reversal of the impeller 82 does not exceed the predetermined number of times of reversal ("No"), in step S26, the control device 65 reverses the impeller 82 by the electric motor 83. Rotates. When the current value (or power value) of the electric motor 83 rises above the determination value, the control device 65 estimates that fibrous or foreign matter F1 is rolled between the impeller 82 and the casing 81. And, at this time, when the impeller 82 is rotated in the reverse direction by the electric motor 83, the fibrous or foreign matter F1 that has been rolled between the impeller 82 and the casing 81 falls off, and the conveying space of the impeller 82 It falls in the portion 97 and is accommodated.

In step S27, the control device 65 determines whether or not the current value (or power value) of the electric motor 83 input from the detector 115 has reached the determination value (rated current value (or rated power value)). To judge. Here, if it is determined ("No") that the electric current (or power value) of the electric motor 83 is lower than the determination value, in step S28, the control device 65 determines the impeller 82 after rotating in the reverse direction. It is determined whether or not the time Tb has elapsed. Here, if it is determined that the predetermined time Tb has not elapsed since the impeller 82 rotates in the reverse direction ("No"), the process returns to step S26. On the other hand, if it is determined that the predetermined time Tb has elapsed since the impeller 82 rotates in the reverse direction (YES), in step S29, the number of times the impeller 82 is reversed is added. Then, in step S30, the control device 65 rotates the impeller 82 in the forward direction by the electric motor 83. Then, the foreign matter F1 that has been rolled between the impeller 82 and the casing 81 is fibrous between the impeller 82 and the casing 81 in that it is accommodated in the conveying space portion 97 of the impeller 82. Alternatively, the foreign matter F1 is rolled up to eliminate the roll-in, and the impeller 82 can rotate in the forward direction, and the supply of solid fuel F can be resumed.

On the other hand, if it is determined in step S23 that the forward rotation time (forward rotation time) of the impeller 82 exceeds the predetermined time Ta (for example, 10 seconds) (“YES”), the impeller added in step S29 is added. The number of reversals of (82) is reset. However, if it is determined in step S25 that the number of times of reversal of the impeller 82 exceeds a predetermined number of times of reversal (for example, three times) ("YES"), in step S32, the rotation of the impeller 82 is stopped. Further, in step S27, when the impeller 82 is rotating in the reverse direction, it is determined that the current value (or power value) of the electric motor 83 has reached the determination value (rated current value (or rated power value)) ( If "YES"), the rotation of the impeller 82 is stopped in step S32.

Here, the operation of the above-described solid fuel supply device will be described by a time chart. 10, at time t0, when the rotary valve 64 starts and the impeller 82 is rotated in the forward direction by the electric motor 83, the current value of the electric motor 83 rises. At time t1, the current value of the electric motor 83 rises to the starting current value, and then falls to the normal operating current value. Thereafter, the rotary valve 64 operates normally, and supplies the solid fuel F to the grinder 31.

At time t2, the fibrous or foreign matter F1 rolls between the impeller 82 and the casing 81, so that the current value of the electric motor 83 rises, and at time t3, the current value of the electric motor 83 is determined. The value (rated current value) is reached. Then, at a time t4 that elapses a predetermined time (for example, 0.5 seconds to 1.0 seconds, which is not instantaneous) after the current value of the electric motor 83 reaches the determination value (rated current value), the electric motor By (83), the impeller 82 is rotated in the reverse direction. In addition, the period T1 from time t0 to time t4 is the forward rotation of the impeller 82.

At time t4, when the impeller 82 rotates in the reverse direction by the electric motor 83, the current value of the electric motor 83 rises. At time t5, the current value of the electric motor 83 rises to the starting current value, and then falls to the normal operating current value. The impeller 82 is rotated in the forward direction by the electric motor 83 at a time t6 after the predetermined time Tb has elapsed after the impeller 82 rotates in the reverse direction at time t4 (after stopping rotation in the forward direction). At time t6, when the impeller 82 rotates in the reverse direction by the electric motor 83, the current value of the electric motor 83 rises. At time t7, the current value of the electric motor 83 rises to the starting current value, and then falls to the normal operating current value. Thereafter, when the curling of the fibrous or foreign matter F1 in the rotary valve 64 is eliminated, the rotary valve 64 operates normally, and supplies the solid fuel F to the grinder 31. The period T2 from time t4 to time t6 is the reverse rotation of the impeller 82 and is equal to the predetermined time Tb, and the period T3 after time t6 is the forward rotation of the impeller 82.

On the other hand, at time t4, when the impeller 82 rotates in the reverse direction by the electric motor 83 and the current value of the electric motor 83 rises, the current value of the electric motor 83 falls from the starting current value. When the determination value (rated current value) is reached without being performed, the rotation of the impeller 82 is stopped because the rolling of the fibrous or foreign matter F1 in the rotary valve 64 continues without being resolved. Further, at time t4, the impeller 82 rotates in the reverse direction by the electric motor 83, the current value of the electric motor 83 rises, and the current value of the electric motor 83 falls from the starting current value. Later, when it rises again and reaches the determination value (rated current value), the rotation of the impeller 82 is stopped in that the fiber or foreign material F1 is again rolled in the reverse rotation of the impeller 82.

In addition, within a predetermined time, when the number of times of reversal of the impeller 82 exceeds a predetermined number of times of reversal (for example, 3 times), the rotation of the impeller 82 is stopped.

In this way, in the solid fuel supply device of the second embodiment, the control device 65 stops the rotation of the impeller 82 when the number of rotations of the impeller 82 in the reverse direction exceeds a preset number of predetermined reversals. Therefore, when the curling of the fibrous or foreign matter F1 in the rotary valve 64 is not resolved, the operation of the rotary valve 64 is stopped to suppress the occurrence of breakage or failure of the rotary valve 64 in advance. Can be.

In the solid fuel supply device of the second embodiment, when the control device 65 rotates the impeller 82 in the reverse direction over a predetermined time Tb, the detector 115 rolls the fibrous or foreign matter F1 between the predetermined time Tb. When the entry is detected, rotation of the impeller 82 is stopped. Therefore, even when the impeller 82 is rotated in the reverse direction over a predetermined period of time Tb, when the roll-in does not resolve, the abnormality of the rotary valve 64 itself is considered, and at this time, the operation of the rotary valve 64 is stopped. , The occurrence of damage or malfunction of the rotary valve can be suppressed in advance.

Further, in the above-described embodiment, as the detector for detecting the roll-in of the fibrous or foreign matter F1 in the rotary valve 64, the detector 115 for detecting the current value or power value of the electric motor 83 was applied. It is not limited to this structure. For example, as the detector for detecting the roll-up in the rotary valve 64, a detector for detecting the number of revolutions of the impeller 82, a detector for detecting the load (torque) of the impeller 82, or the like may be used. In addition, a camera may be applied as a detector for detecting the roll-in of foreign matter F1 in the rotary valve 64.

10: boiler
11: brazier
12: combustion device
13: year
21, 22, 23, 24, 25: combustion burner
26, 27, 28, 29, 30: Differential fuel supply pipe
31, 32, 33, 34, 35: grinder (mill)
60: solid fuel supply
61: bunker
62: fuel supply
63: solid fuel supply pipe
64: rotary valve
65: control unit
71: down spout part
72: conveying unit
73: electric motor
74: upper fuel supply pipe
75: lower fuel supply pipe
76: upper connection (connection)
77: lower connection
81: casing
82: impeller
83: electric motor
91: rotating shaft
92: Supply port
93: outlet
94: shaft support
95: Blade
96: tumbler
97: conveying space part
98: Seal side
110: control panel
111: power supply
112: power switch
113: forward rotation switch
114: reverse rotary switch
115: detector
116: display panel
121: checkout
122: waste paper cover
123: roll-in mock switch
F: solid fuel
F1: fiber or foreign body

Claims (15)

A solid fuel supply pipe for supplying solid fuel,
A rotary valve provided on the solid fuel supply pipe and having a rotatable impeller,
A detector for detecting roll-in at the rotary valve,
When the detector detects the roll-in, the control device for rotating the impeller in the reverse direction over a predetermined time and then rotating in the forward direction
Solid fuel supply device characterized in that it comprises. The solid fuel supply pipe is provided with a pulverizer downstream of the solid fuel supply direction, and the predetermined time is a time shorter than the pulverization processing of the solid fuel by the pulverizer. Solid fuel supply device characterized in that it is set. The solid fuel supply apparatus according to claim 2, wherein the predetermined time is set to a time between 1/4 rotation and 1/2 rotation of the impeller. The amount of the solid fuel accommodated in the conveying space portion provided between the plurality of blades during the forward rotation of the impeller according to any one of claims 1 to 3, is smaller than the volume of the conveying space portion. Solid fuel supply device characterized in that it is set. The solid fuel supply apparatus according to claim 4, wherein the amount of the solid fuel accommodated in the conveying space portion is set between 30% and 80% of the volume of the conveying space portion. According to any one of claims 1 to 3, further comprising an electric motor for driving and rotating the impeller,
The detector detects a current value or power value of the electric motor,
The control device, when the current value or power value of the electric motor reaches a predetermined determination value, the solid fuel supply device, characterized in that rotating the impeller in the reverse direction over the predetermined time. The solid fuel according to any one of claims 1 to 3, wherein the control device stops the rotation of the impeller when the number of rotations of the impeller in the reverse direction exceeds a preset number of reversals. Feeder. According to any one of claims 1 to 3, When the control device detects that the detector rolls in between the predetermined times when the impeller is rotated in the reverse direction over the predetermined time, the impeller of the Solid fuel supply device characterized in that to stop the rotation. The solid fuel supply apparatus according to any one of claims 1 to 3, further comprising a casing rotatably supporting the impeller, and an inspection hole is provided in the casing. The solid fuel supply apparatus according to any one of claims 1 to 3, wherein a decomposable connection portion is provided upstream of the supply direction of the solid fuel than the rotary valve in the solid fuel supply pipe. The solid fuel supply device according to any one of claims 1 to 3, wherein a curling simulation switch is provided to output a curling signal to the control device irrespective of the detection result of the detector. The rotary valve of the rotary valve, a forward rotary switch of the rotary valve, and a display panel of the detector are arranged in the vicinity of the rotary valve according to any one of claims 1 to 3. Solid fuel supply. In the solid fuel supply device is provided with a rotary valve having a rotatable impeller in the solid fuel supply pipe for supplying solid fuel,
A step of rotating the impeller to supply the solid fuel by the solid fuel supply pipe,
A step of rotating the impeller in a reverse direction over a predetermined time when detecting the roll-up in the rotary valve;
The process of rotating the impeller in the forward direction after the lapse of the predetermined time
Solid fuel supply method characterized in that it has. A pulverizer comprising the solid fuel supply device according to any one of claims 1 to 3. A boiler comprising the solid fuel supply device according to any one of claims 1 to 3.

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