WO2013132586A1 - 穀粒乾燥方法 - Google Patents
穀粒乾燥方法 Download PDFInfo
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- WO2013132586A1 WO2013132586A1 PCT/JP2012/055635 JP2012055635W WO2013132586A1 WO 2013132586 A1 WO2013132586 A1 WO 2013132586A1 JP 2012055635 W JP2012055635 W JP 2012055635W WO 2013132586 A1 WO2013132586 A1 WO 2013132586A1
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- grain
- hot air
- stage
- drying
- dryer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
- F26B17/14—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
- A23B9/00—Preservation of edible seeds, e.g. cereals
- A23B9/08—Drying; Subsequent reconstitution
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/06—Grains, e.g. cereals, wheat, rice, corn
Definitions
- the present invention relates to a grain drying method for drying grains such as rice and wheat using a grain drying facility equipped with a plurality of dryers connected in series through a grain conveyance path.
- ⁇ Grain after harvesting such as glutinous rice, is dried to preserve moisture before storage to prevent mold generation. In this case, if it is dried rapidly once, it becomes a defective product with cracked grains. Therefore, it is general to set the drying process to a plurality of stages and gradually dry to a predetermined moisture value.
- raw material grains immediately after harvesting are concentrated in a joint drying facility having a grain drying function. For this reason, in a large-scale grain joint drying facility, the grain is usually dried by a grain drying facility equipped with a large number of dryers.
- a plurality of hot air dryers are installed adjacent to each other, and the receiving side and the dispensing side are connected to each other via a cereal mill and a grain conveyance path. And raw material grain is thrown into the head hot air dryer, each hot air dryer is allowed to pass through the grain raising machine and the grain conveying path, and the grain is passed to the last hot air dryer to be dried.
- a plurality of hot air dryers are installed adjacent to each other, and a grain circulation conveyor is connected to each dry hot air dryer so as to be switchable between a circulating state or a forward (continuous) state.
- a grain drying facility is described. In this grain drying facility, the received raw material grains are individually put into each hot-air dryer for storage and primary drying, and the grains after primary drying are put into a sub silo. Then, the grains in the auxiliary silo are successively moved to each hot air dryer in this order for finish drying, and finally stored in the main silo.
- JP 2007-155147 A discloses a grain drying facility in which a plurality of hot air dryers are connected from a first stage hot air dryer to a final stage hot air dryer.
- this grain drying facility there is a drying method in which raw grain is put into the first stage hot air dryer, then each stage hot air dryer is sequentially passed to the last stage hot air dryer to obtain a finished moisture value.
- circulation drying is performed until the moisture value set for each stage of hot air dryer is reached. Then, the water content of the grain set in each stage is sent to the next stage hot air dryer, and the final stage hot air dryer delivers the grain having the finished moisture value.
- a drying method is described.
- the object of the present invention is to allow a grain to be dried to a predetermined finish moisture value by passing it once through a grain drying facility in which a plurality of hot-air dryers are connected continuously, with little loss of time.
- An object of the present invention is to provide a grain drying method in which each hot air dryer can be easily controlled.
- the hot air dryer having a hot air drying section and a storage section has a receiving side and a paying side from the first drying machine to the final drying machine. They are connected in series with respect to the grain flow. Then, in each stage of the hot air dryer, the moisture drying rate suitable for the grain to be moisture-adjusted between the moisture value of the raw material grain and the moisture value of the moisture adjustment-completed grain determined in advance. Corresponding to the (reduction rate), it is allocated as the grain moisture value at the time of delivery of the hot air dryer at each stage, and the raw material grains input from the No. 1 dryer are sequentially dried by the dryer at each stage and passed once as a whole In the final dryer, the moisture adjusted grain is taken out.
- each drying is based on the detected moisture value and the above-mentioned delivery grain moisture value set in each hot air dryer. Adjust the temperature of hot air supplied to the hot air drying section of the machine. The hot air temperature is calculated based on the data of the grain moisture-hot air temperature table stored in the control unit so that the grain moisture value at the time of delivery set in the hot air dryer at that stage is achieved.
- the hot air dryers of each stage are connected in series with respect to the flow of the grain, and the sending section of the hot air dryer of the previous stage is connected to the receiving section of the former stage dryer and the latter stage dryer through the grain conveyance path, and the grain
- a grain drying facility in which a switching valve is arranged in the middle of the conveyance path and the grain flow can be switched between the front stage side and the rear stage side.
- the switching valve When the grain drying method is executed, the switching valve is initially switched to the front stage side, and when the amount of grain exceeding the capacity of the hot air drying section is initially stored in the hot air dryer of the previous stage, the hot air drying section Circulate operation to return the grain located at the storage part, and when all of the initial grain at this position has been returned to the storage part, the switching valve is switched to the rear stage side, this time the grain that has passed through the hot air drying part There is a case where the operation is a joint operation in which the grains are sent to the next stage without being circulated.
- a level sensor or the like that can know the degree of grain accumulation can be used.
- it may be set as the grain drying method which drives a subsequent hot-air dryer and a masher at the timing when all the initial grain of the hot-air drying part in the front-stage hot-air dryer was returned to the storage part.
- a method of stopping the operation of the hot air dryer and the cerealing machine at that stage may be adopted. Thereby, the hot-air dryer and cereal machine of each stage are stopped sequentially from the No. 1 dryer side.
- the grain masher attached to Unit 1 may be stopped when the Unit 1 dryer is stopped.
- the multi-stage hot air dryers that make up the grain drying facility perform circulation operation for a short period of time immediately after the start of operation in each stage, but immediately become a continuous operation, and there is little time waste for the grain drying work. . Since the moisture adjustment complete grain can be obtained by passing the raw material grain once through the grain drying facility, it is possible to dry a large amount of cargo to a moisture value that can be efficiently stored. In each stage of the grain drying equipment, the moisture content of the grain is reduced without difficulty until it reaches the moisture-adjusted grain from the raw material grain, and the drying proceeds. Therefore, the occurrence of defective grains such as cracks in the grain is small. The moisture content of the grain sent out from the previous stage is measured, and the hot air temperature is determined based on this and the moisture value set in the hot air dryer at this stage, so the drying operation of the hot air dryer at this stage should be performed appropriately. Can do.
- the deficiency of the drying level in the previous stage is compensated by adjusting the hot air temperature in this stage, so the moisture value of the moisture adjustment completed grain sent from the final stage hot air dryer is the preset adjustment completed moisture content. Value.
- Control of only the operation time management and temperature adjustment by the timer or the grain level sensor is the main, and the configuration of the control unit can be simplified.
- the front view which shows roughly the whole grain drying equipment used for drying of sticky rice.
- the processing flow figure which shows the action
- the first half of the processing flow showing the operation in the drying unit.
- the processing flowchart which shows the action
- the first embodiment will be described below.
- This grain drying method is executed in the grain drying facility 1 shown in FIG.
- the grain drying facility 1 is composed of an input masher 2, a hot-air dryer 3, a cerealing machine 4, and a drying unit 5 comprising devices attached thereto.
- the threshing machine 2 for input is provided with a hopper 6 at the lower part, and in this embodiment, accepts ginger collected in a common drying facility.
- the masher 2 conveys this ginger upward and throws the ginger into the tank from the upper part of the storage tank 7 of the hot air dryer 3.
- Reference numeral 8 denotes an introduction / diffusion device for guiding the grains received from the input cerealing machine 2 to the inside of the tank and widely diffusing the inside of the tank.
- the hot air dryer 3 (FIG. 2) consists of the storage tank 7 and the delivery section 9 below the storage tank.
- the interior of the storage tank 7 is composed of an upper storage section 10 and a lower hot air drying section 11.
- the storage unit 10 has a larger capacity than the hot air drying unit 11.
- the hot air drying unit 11 has a capacity of 10 t (converted to rice, hereinafter the same)
- the storage unit 10 has a capacity of 50 t
- the amount is 60t or more in total.
- FIG. 3 is a diagram for schematically showing the upper surface position of the grains accumulated in the storage tank 7, the symbol A indicates the bottom position of the storage tank 7, and the symbol B indicates the hot air drying unit 11 and the storage unit.
- 10 is a virtual boundary position
- symbol C is a position where 50t of grain is accumulated in the storage tank 7 when the grain reaches this position
- symbol D is assumed that the grain is full in the storage tank 7. It is the position of the accumulation amount 60t.
- the hot air drying unit 11 includes a hot air chamber 12 and a drying passage 13 that passes through the hot air chamber 12 in the vertical direction and reaches the lower delivery unit 9.
- the drying passage 13 is formed of a net-like iron plate and communicates with the lower portion of the storage unit 10. Therefore, the grains can flow down from the storage unit 10 toward the delivery unit 9 through the drying passage 13.
- the sending unit 9 is composed of a screw conveyor.
- hot air generated by the heat exchanger 15 of the combustion furnace 14, which is an accessory device, is introduced into the hot air chamber 12 through the air passage 16, passes through the drying passage 13, and is on the opposite side. It is discharged from the exhaust port 17.
- An adjusting valve 18 for introducing outside air into the air passage is arranged in the air passage 16.
- the adjusting valve 18 is controlled to be opened and closed by a control unit 19 (FIG. 1) provided in the grain drying facility, and thereby the hot air temperature can be adjusted.
- the hot air temperature can also be adjusted by controlling the degree of combustion of the burner 20.
- the cerealing machine 4 has basically the same configuration as that of the input cerealing machine 2, but cereals the grain from the sending unit 9 of the hot air dryer 3 and sends it to the switching valve 21.
- these cerealing machines 2 and 4 convey the grain at a constant speed of 0.5 t / min. That is, the time for 60t of grain to be put into the storage tank 7 of the hot air dryer 3 by the cerealing machine 2 or 4 is 120 minutes, and during this time, the full (60t) of grain is hot air dried from the storage tank 7. It is the same as the time sent out through the section 11.
- the hot air dryer 3 and the cerealing machine 4 constitute a unit of the grain drying equipment 1 as a set, and this is referred to as a drying unit 5.
- the drying units 5 are arranged in six stages, and each unit is connected to the grain raising machine 4 and the grain conveyance path 22 located between the hot air dryers 3.
- the grain conveyance path 22 has the switching valve 21 in the middle, and branches at the position of the switching valve 21 to the front stage side and the rear stage side.
- the front-stage grain conveyance path 23 is connected to the introduction diffusion apparatus 8 of the front-stage hot air dryer 3, and the rear-stage grain conveyance path 24 is connected to the introduction diffusion apparatus 8 of the rear-stage hot air dryer 3.
- the switching valve 21 when the switching valve 21 is switched to the front side, the grains that have passed through the front stage hot air dryer 3 are returned to the front stage hot air dryer 3 by the masher 4 and circulated again.
- the operation of the hot air dryer 3 that circulates the grains in this way is referred to as circulation operation.
- the switching valve 21 When the switching valve 21 is switched to the rear stage side, the grain from the cerealing machine 4 is conveyed to the rear stage side and put into the hot air dryer 3 at the rear stage. In this way, the operation in which the grain of the hot air dryer 3 at the front stage is not circulated and is directly supplied from the hot air drying unit 11 to the hot air dryer 3 at the rear stage is referred to as a joint operation.
- a moisture measuring device 25 is arranged in the vicinity of the feeding outlet of the input cerealing machine 2 and in the conveyance path 24 on the rear stage side through the switching valve 21 in each stage.
- an infeed sensor 26 is disposed in the vicinity of the outlet of the input cerealing machine 2
- a grain sensor 27 is disposed in the vicinity of the outlet of the cerealing machine 4. These detect the presence or absence of grains.
- Reference numeral 28 denotes a temperature sensor, which is disposed on the downstream side of the regulating valve 18 in the conveyance path 16 from the heat exchanger 15.
- the burner 20 includes a control valve that can adjust the fuel injection amount.
- Signals from these sensors are transmitted to the control unit 19 provided in the grain drying facility 1 through the input / output circuit I / O, and the signals for driving these valves via the input / output circuit I / O. (FIG. 4).
- the control unit 19 controls the determination of the hot air temperature, the operation of the hot air dryer 3 during the circulation operation and the joint operation, and the like by a program stored in the ROM. Such control is the same as in the case of a conventional hot air dryer.
- a grain moisture-hot air temperature data table (FIG. 5) is recorded in the memory of the control unit 19 so as to be accessible from the CPU.
- the data of FIG. 5 is a case where the grain is sticky rice, (a) is No. 1 dryer, (b) is No. 2 dryer, (c) is No. 3 dryer, (d) is No. 4 dryer, (E) is a data table about No. 5 dryer, (f) is a data table about No. 6 dryer.
- This data shows that hot air that can be dried by drying from the raw rice bran at an appropriate moisture drying rate between the moisture value of the raw rice bran and the target moisture value determined in advance (moisture value after completion of moisture adjustment). It shows the temperature. Data is determined experimentally.
- the moisture value is about 25%, and this moisture value is reduced to about 14.5% as a target value and stored as a moisture adjustment completed rice cake.
- the drying process is repeated 6 times while circulating the rice in one dryer, and gradually dried at an appropriate moisture drying rate.
- the raw rice grains charged into the No. 1 dryer 3a are gradually dried by the No. 1 dryers 3a to 6f arranged in series and the No. 6 as a whole as a whole. Moisture-adjusted polished rice is obtained from the dryer 3f.
- One desirable example of the moisture value reduction standard in each hot air dryer 3 is to dry the raw rice rice having a moisture value of 25% with a No. 1 dryer 3a to a moisture value of 22.5% and to pay it out with the No. 2 dryer 3b.
- Dried rice with a moisture value of 22.5% dried to a moisture value of 20.5% and discharged with a No. 3 dryer 3c Dried rice with a moisture value of 20.5% dried to a moisture value of 18.5% and discharged
- the dried rice with a moisture value of 18.5% was dried to a moisture value of 17.0% by the dryer 3d and discharged.
- the dried rice with a moisture value of 17.0% was dried to a moisture value of 15.5% with the No. 5 dryer.
- FIG. 6 shows a basic operation flow.
- the hopper 6 below the cerealing machine 2 has an environment in which accumulated ginger continuously accumulates sufficiently.
- ginger is accumulated in the storage tank 7 in the hot air dryer 3 of the first stage drying unit 5 at a rate of 0.5 t / min. At this time, the hot air dryer 3 and the cerealing machine 4 are not operated.
- f + 1 1
- the first stage drying unit 5 is activated.
- the time required for the drying unit 5 to run from the first stage to the final drying unit 5 is 120 minutes ⁇ 6 units.
- step S7 the operation shown in FIG. 7 is started. That is, in the drying unit 5 in the first stage, the input of the ginger into the storage tank 7 is continued by the operation of the input cerealing machine 2.
- Moisture is measured (step S7).
- the measured moisture value (M) is transmitted to the control unit 19 via the input / output circuit I / O, and the CPU of the control unit 19 uses the moisture determination program stored in the ROM to store the grain moisture in the memory-hot air.
- step S9 it waits for 100 minutes to elapse.
- ginger continues to be fed through the input cerealing machine 2, so that after 100 minutes, 50 t of ginger is accumulated from the hot air drying unit 11 to the storage unit 10.
- step S9 it is checked whether the switching valve 21 is on the front side. If it is not on the front side, this is switched to the front side (step S11).
- the control device 19 operates the drying unit 5 in the first stage.
- the combustion furnace 14 is operated and hot air generated by the heat exchanger 15 is supplied to the drying unit of the hot air dryer 3 through the air passage 16.
- the whipping machine 4 is driven, the delivery unit 9 at the lower part of the hot air dryer 3 is driven, and the grains of the hot air drying unit 11 are sent to the masher 4.
- the grain inside the storage tank 7 flows down sequentially from the storage unit 10 to the hot air drying unit 11, and the grain sent up by the masher 4 has the switching valve 21 at the front side. Then, it is returned to the original storage tank 7 again. This period is 20 minutes until all of the grains originally present in the hot air drying unit 11 are returned to the original storage tank 7 again. That is, the hot air dryer 3 is circulated only during this time (step S12).
- ginger continues to be fed from the input cerealing machine 2 during the circulation operation, and when 20 minutes have passed, 10 t of fresh ginger has been newly added, and the storage tank 7 has a total of 60 t of grain. Grains will accumulate.
- the grains that are initially present and circulated in the hot air drying unit 11 undergo the first hot air drying in the hot air drying unit 11.
- the hot air from the heat exchanger 15 determines the hot air temperature in the hot air drying section 11 of the air passage 16 by adjusting the opening of the adjusting valve 18 to take in outside air or adjusting the combustion amount of the burner 20. Move closer to the value. This temperature adjustment is performed by feeding back the measurement value from the temperature sensor 28 provided immediately before the hot air drying unit 11 of the air passage 16 to the control unit 19.
- step S13 When 20 minutes have elapsed (step S13), the control unit 19 switches the switching valve 21 to the rear side (FIG. 8, step S14), and continues the hot air drying operation (step S15). Then, the primary dried kernel that has been subjected to the drying action in the hot air drying unit 11 is sent from the sending unit 9 to the masher 4, and is sent from the upper part of the masher 4 to the switching valve 21. At this time, the switching valve 21 is on the rear stage side, and the primary dry grain is supplied not to the original storage tank 7 but to the subsequent storage tank 7. That is, the primary dry grain does not circulate and is sent to the drying unit 5 in the next stage. This is referred to as joint operation.
- the tandem operation in the drying unit 5 in the first stage is performed until all the ginger to be collected and processed this time is supplied from the input cerealing machine 2 to the hot air dryer 3, that is, the outlet of the cerealing machine 4
- the process is continued as long as the grain sensor 27 arranged in the vicinity detects the grain (step S16).
- the continuous operation is continued after checking whether or not the feeding sensor 26 arranged in the vicinity of the feeding port of the input cerealing machine 2 detects the grain (step S19).
- the feed sensor 26 no longer detects the grain, it means that all the ginger to be processed has been sent to the drying unit 5 in the first stage, so the drive of the input cerealing machine 2 is stopped. To do.
- the grain sensor 27 does not detect a grain in step S16, it means that all the grains (primary dry rice cake) have passed the first stage drying unit 5, so the first stage drying unit. 5 stops the drying operation. In addition, when the combustion furnace 14 is attached to each drying unit, this also stops.
- step S7 The operations including the above-described circulation operation and step operation from step S7 to step S17 starting from the above moisture measurement (step S7) are similarly performed in the drying unit 5 in the second stage.
- the primary dried grain sent out from the preceding cerealing machine 4 is input to the hot air dryer 3 through the switching valve 21.
- the moisture measurement is related to the primary dried grain just before being introduced, and the moisture data referred to by the CPU when determining the hot air temperature is, for example, the first data table (b) in the grain moisture-hot air temperature table. Line.
- the grain sensor 27 of the masher 4 stops detecting a grain in the drying unit of the second stage, the drying unit 5 of the second stage is stopped.
- the drying units 5 in each stage are sequentially operated and stopped.
- the moisture measurement is related to the dried grain in the previous stage, and the CPU refers to the grain moisture-hot air temperature table when determining the hot air temperature, for example, in the first row of the data tables (c) to (f).
- the grain whose moisture value has been sequentially reduced from the first dry grain to the sixth dry grain is adjusted in moisture from the rear-stage grain conveyance path 24 of the grain raising machine 4 in the sixth drying unit 5. It is discharged as a completed soot.
- the moisture value of the grain sent from the drying unit 5 of each stage to the drying unit 5 of the next stage does not reach the set moisture value that should be achieved in the previous stage, the moisture value is Accordingly, it is programmed to select other rows as appropriate, such as adopting the second row in each of the data tables (a) to (f) in the grain moisture-hot air temperature table.
- control unit 9 controls the basic process of sequentially operating a plurality of drying units 5 connected in series by the grain conveyance paths 23, 24, and the processing of each drying unit 5, and sends out the grains.
- This control is a combination of two types of individual processing in which the operation of the drying unit 5 is stopped when no more is detected.
- Step S18 is provided to stop the initial input cerealing machine 2, and after this stops, it only passes through step S19.
- the ginger fed by the input cerealing machine 2 is dried at a drying unit 5 at each stage at a plurality of stages of moisture drying rate at which grain moisture is appropriately set. It is discharged as a moisture adjusted grain. For this reason, only by putting the ginger after harvesting into the grain drying facility 1, it is possible to obtain a grain whose moisture adjustment has been completed by one pass. This improves the time efficiency of the drying process. Moreover, since it can be made to dry with a suitable drying rate, the ratio of the defective grain which produced the crack etc. is small. In addition, since the volume of the raw material becomes smaller as the drying of the grain proceeds, the grain discharge rate in the lower drying unit tends to increase.
- the structure of the grain drying facility is basically the same as the [structure of the grain drying facility] in the first embodiment described above.
- the grain level sensors 29 and 30 are arranged in the grain tank 7 in the drying unit of each stage.
- the grain level sensor 29 emits an ON signal when 50t of grain is stored in the storage tank 7, and the grain level sensor 30 emits an ON signal when 60t of grain is stored in the storage tank 7. is there.
- the on signals of the grain level sensors 29 and 30 are transmitted to the CPU of the control unit 19 through the input / output circuit I / O (indicated as level sensors C and D in FIG. 9).
- the grain level sensor 29 is arranged at the position C shown in FIG. 3, and the grain level sensor 30 is arranged at the position D.
- the operation of each part is the same as in the first embodiment. Detailed description is omitted to avoid redundancy.
- the operation by the control unit is basically the same as the [operation by the control unit] described above in the first embodiment, and the second embodiment in the operation of the grain drying facility 1.
- a grain drying method is implemented.
- the timing of sequentially operating the f-stage drying unit 5 (step S4) is set to every 120 minutes (step S5), and the flow of FIGS.
- the start of the circulation operation and the switching to the continuous operation are performed by timekeeping (step S9, step S13), whereas in the second embodiment, in FIG. As shown in FIG. 10, these timings are performed based on the amount of grains accumulated in the storage tank 7.
- the grain level sensors 29 and 30 are used.
- the control unit 19 operates the cereal drying facility 1 as in the first embodiment (FIGS. 10, 11, and 12).
- step S5 of the basic program as shown in FIG.
- D When D is turned on after being turned on, the next drying unit 5 is operated. When turned on, it means that 60 tons of grains have been accumulated in the storage tank 7 in this embodiment (grain upper surface position D). This is equivalent to the passage of 120 minutes in step S5 in FIG. 6 of the first embodiment.
- the timing of the circulation operation is performed after the grain level sensor C is turned on. This is equal to the passage of 100 minutes (grain upper surface position C) in FIG. 6, step S6 of the first embodiment.
- switching to the simultaneous operation is performed after the grain level sensor D is turned on. This is equal to 20 minutes (grain upper surface position D) of FIG. 6, step S13 of the first embodiment.
- the circulation operation is started when 50 tons of grains are accumulated in the storage tank 7.
- the ginger is also supplied from the input cerealing machine 2, so that all the grains originally located in the hot air drying unit 11 of the storage tank 7 are originally stored by the circulation operation.
- the same amount of ginger is accumulated, and the storage tank 7 accumulates a total of 60t including the newly added ginger 10t in addition to the initial 50t of circulation operation. .
- the grain located in the lower part of the hot air drying unit 11 is subjected to a drying action and becomes the primary dried grain, it is sent out to the subsequent drying unit 5 without being circulated thereafter.
- the basic program FIG. 10, step S4
- the next drying unit 5 is in an operating state, and the primary dried kernel can be received.
- the drive of the input cerealing machine 2 is stopped. Further, when all the primary dry rice cakes pass through the first stage drying unit 5 and the grain sensor 27 no longer detects the grain, the operation of the first stage drying unit 5 is stopped. Thereafter, the six drying units 5 are sequentially stopped in the same manner as in the first embodiment.
- the ginger put into the first stage drying unit 5 by the input cerealing machine 2 is passed through the grain drying facility 1 once and dried in the final stage. From unit 5, a moisture adjustment completion culm with the grain moisture as the target value can be obtained.
- the position where the grain level sensor 29 is disposed is not particularly problematic as long as the grain amount inside the storage tank 7 is a position where an on signal is generated when the amount of grain in the storage tank 7 is stored for 48 to 50 t. There is no particular problem if 30 is arranged at a position where an ON signal is issued when the amount of grain in the storage tank 7 is stored for 58 to 60 t.
- the timing for starting the circulation operation and the timing for switching to the joint operation are performed according to the actual accumulated amount of the grain, the quantitative processing can be performed accurately. There is a possibility that time loss can be further reduced.
- the timing for starting the circulation operation and the timing for switching to the joint operation are based on the timing as in the first embodiment, it is necessary to wait for an extra time regardless of whether the grain has reached the set amount for some reason. However, such a time loss can be eliminated.
- the inconvenience of starting the circulation operation or the joint operation due to the expiration of the standby although the amount of accumulated grains is insufficient for some reason is also solved. Further, as the drying of the grain proceeds, the volume of the raw material becomes small, and even if the grain discharge rate tends to increase in the drying unit on the lower side, it is less affected.
- the drying unit 5 is six stages, but it can be increased or decreased according to the relationship between the drying rate of moisture and the type of grain to be dried.
- the amount of grain stored in the storage tank 7 of the hot air dryer 3 is 60 t, of which the amount of the hot air drying unit 11 is 10 t, and the amount of grain input, delivery, and transport is 0.5 t / These numbers are examples, but actually depend on the scale of the hot air dryer 3 to be installed.
- the combustion furnace 14 can use a biomass combustion furnace or the like instead of the gas burner type.
- the hot air supplied to the hot air drying unit 11 is not only generated by a heat exchanger, but air directly heated by, for example, a gas burner may be introduced as hot air.
- the hot air dryer 3 in the drying unit 5 of each stage may be a conventional circulating hot air dryer.
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Abstract
Description
そして、各段の熱風乾燥機に、原料穀粒の水分値とあらかじめ決定してある水分調整完了穀粒の水分値との間を、水分調整をしようとする穀粒に適切な水分乾減率(低減率)に対応させて各段の熱風乾燥機の送り出し時穀粒水分値として割り振り、1号乾燥機から投入した原料穀粒を各段の乾燥機で順次乾燥させ、全体として1回通しで最終号乾燥機から水分調整完了穀粒を取り出す。なお、各段の熱風乾燥機では、投入される直前の穀粒水分値を計測し、その検出水分値と各熱風乾燥機に設定された前記の送り出し時穀粒水分値に基づいて、各乾燥機の熱風乾燥部に供給する熱風の温度を調整する。熱風温度は、制御部に格納した穀粒水分-熱風温度テーブルのデータに基づいてその段の熱風乾燥機に設定された送り出し時穀粒水分値が達成されるよう割り出される。
また、前段の熱風乾燥機における熱風乾燥部の当初穀粒がすべて貯留部へ戻されたタイミングで、後段の熱風乾燥機と揚穀機を駆動する穀粒乾燥方法とすることもある。
さらに、穀粒乾燥設備の停止手段として、各段の熱風乾燥機が送り出す穀粒を検出する穀粒センサーを揚穀機の穀粒送り出し箇所に配置し、穀粒の送り出しが検出されなくなったとき、その段の熱風乾燥機と揚穀機の稼動を停止する方法を採用することもある。
これにより、各段の熱風乾燥機や揚穀機は1号乾燥機側から順次停止する。1号機に付属の投入用揚穀機は、1号乾燥機の停止とともに停止させてもよい。
穀粒乾燥設備に原料穀粒を一回通しするだけで、水分調整完了穀粒を得られるので、大量の集荷を効率よく保存可能な水分値まで乾燥することができる。
穀粒乾燥設備の各段において、原料穀粒から水分調整完了穀粒となるまで穀粒水分が無理なく低減されて乾燥が進むので、穀粒にひびが入るなど不良穀粒の発生が少ない。前段の送り出し穀粒の水分を計測し、これとこの段の熱風乾燥機に設定された水分値に基づいて熱風温度が決定されるので、この段における熱風乾燥機の乾燥作動を適切に行なうことができる。
タイマーあるいは穀粒レベルセンサーによる作動時間の管理と温度の調整だけの制御が主となり、制御部の構成を簡単なものとできる。
〔穀粒乾燥設備の構造〕
この穀粒乾燥方法は、図1に示す穀粒乾燥設備1において実行される。
穀粒乾燥設備1は、投入用の揚穀機2、熱風乾燥機3と揚穀機4及びこれらに付属する装置などからなる乾燥単位5とで構成されている。
貯留部10は熱風乾燥部11よりも容量が大きく、この実施例では、熱風乾燥部11の容量が10t(籾米換算、以下同)、貯留部10の容量が50tで、貯留タンク7の最大貯留量はこれを合計した60t以上となっている。図3は、貯留タンク7内において蓄積される穀粒の上面位置を概略で示すための図であり、符号Aは貯留タンク7の底位置を示し、符号Bは、熱風乾燥部11と貯留部10との仮想境界位置、符号Cはこの位置に穀粒が達すると貯留タンク7に穀粒が50t蓄積されている位置であり、符号Dは、貯留タンク7において穀粒が満杯であるとする蓄積量60tの位置である。
このデータは、原料籾米の水分値とあらかじめ決定してある目標水分値(水分調整完了籾米の水分値)との間を原料籾米から適切な水分乾減率で乾燥させて水分調整完了とできる熱風温度を示したものである。データは実験的に定められる。
制御部19は次のように、穀類乾燥設備1を稼動する。
図6は基幹となる作動フローを示したもので、メインスイッチの投入などで、穀類乾燥設備1が稼動すると、まずフラグfをf=0と初期化し(ステップS1)、投入用揚穀機2を駆動する(ステップS2)。このとき、揚穀機2下部のホッパー6には集積された生籾が連続して十分に蓄積される環境が整っているものとする。
投入用揚穀機2の稼動によって、生籾が第1段乾燥単位5の熱風乾燥機3における貯留タンク7内に0.5t/分の割合で蓄積されていく。このとき、熱風乾燥機3や揚穀機4は稼動されていない。
100分が経過すると、切換弁21が前段側になっているかをチェックし(ステップS9)、前段側となっていなければこれを前段側に切り換える(ステップS11)。
そして、制御装置19は第1段の乾燥単位5を稼動する。すると、燃焼炉14が稼動されて熱交換器15によって生成された熱風が送風路16を通じて熱風乾燥機3の乾燥部に供給される。また、揚穀機4が駆動され、熱風乾燥機3下部の送出部9が駆動されて、熱風乾燥部11の穀粒が揚穀機4に送り出される。
なお、循環運転の間も投入揚穀機2から生籾が投入されつづけており、20分経過するときには、新たに10tの生籾が投入されており、貯留タンク7には合計で60tの穀粒が蓄積されることになる。また、当初に熱風乾燥部11に存在して循環された穀粒は熱風乾燥部11で第1次の熱風乾燥を受ける。
なお、燃焼炉14が個々の乾燥単位に付属しているときはこれも停止する。
何らかの事情で、各段の乾燥単位5から次段の乾燥単位5へ送込まれる穀粒の水分値が前段において達成されているべき設定された水分値に達していないときは、その水分値に応じて、穀粒水分-熱風温度テーブルにおけるデータ表(a)~(f)のそれぞれにおいて第2行を採用するなど適宜、他の行を選択するようにプログラムされている。
なお、穀粒の乾燥が進むにつれて、原料の容積が小さくなるので、下段側の乾燥単位での穀粒排出速度が速くなる傾向があるが、そのような場合は、各段の熱風乾燥機の送出部9や揚穀機4での穀粒の搬送速度を調整すればよい。ただ、下段側の乾燥単位の穀粒排出速度が速くなったとしても、原料穀粒の流れが滞る原因にはならないので大きな問題ではない。
第2の実施例において、穀粒乾燥設備の構造は、基本において前記した第1の実施例における〔穀粒乾燥設備の構造〕と同じである。ただ、各段の乾燥単位における穀粒タンク7に穀粒レベルセンサー29、30が配置されている。穀粒レベルセンサー29は、貯留タンク7に50tの穀粒が貯留されたときオン信号を発し、穀粒レベルセンサー30は貯留タンク7に60tの穀粒が貯留されたときオン信号を発するものである。このため、図8のように、制御部19のCPUに入出力回路I/Oを通じて穀粒レベルセンサー29,30のオン信号を伝達する(図9ではレベルセンサーC,Dと記入)。
なお、穀粒レベルセンサー29は、図3において示した位置Cに配置され、穀粒レベルセンサー30は、位置Dに配置されている。
各部の作動は第1の実施例の場合と同じである。冗長を避けるため詳細な説明を省略する。
ただ、第1の実施例では、図6のフローのように、f段乾燥単位5を順次稼動(ステップS4)するタイミングを120分毎とし(ステップS5)、また、図6-図7のフローに示すように、f段乾燥単位の作動において、循環運転の開始や連座運転への切換えが計時によって行われている(ステップS9,ステップS13)のに対して、第2の実施例では、図10のように、これらのタイミングを貯留タンク7内に蓄積される穀粒の量で行うこととしている。このために、前記の穀粒レベルセンサー29,30が利用される。
このようにして、第2の実施例においても、投入用揚穀機2で第1段の乾燥単位5に投入された生籾は、穀粒乾燥設備1に対する1回通しで、最終段の乾燥単位5から穀粒水分が目標値とされた水分調整完了籾を得ることができる。
また、穀粒の乾燥が進むにつれて、原料の容積が小さくなり、下段側の乾燥単位での穀粒排出速度が速くなる傾向が生じても影響を受けることが少ない。
実施例では熱風乾燥機3の貯留タンク7に貯留される穀粒の量を60t、そのうちの熱風乾燥部11の量を10t、穀粒の投入、送り出し、搬送の量をいずれも0.5t/分としているが、これらの数字は例であって、実際は設置する熱風乾燥機3の規模による。
燃焼炉14はガスバーナー型に代えて、バイオマス燃焼炉などを利用することもできる。また、熱風乾燥部11へ供給する熱風は熱交換器で生成するものばかりでなく、例えばガスバーナーによって直接加熱された空気を熱風として導入することもある。
各段の乾燥単位5における熱風乾燥機3は従来の循環式熱風乾燥機であってよい。
2 投入用の揚穀機
3 熱風乾燥機
4 揚穀機
5 乾燥単位
6 ホッパー
7 貯留タンク
8 導入拡散装置
9 送出部
10 貯留部
11 熱風乾燥部
12 熱風室
13 乾燥用の通路
14 燃焼炉
15 熱交換器
16 送風路
17 排気口
18 調整弁
19 制御部
20 バーナー
21 切換弁
22 穀粒搬送路
23 前段側の穀粒搬送路
24 後段側の穀粒搬送路
25 水分測定器
26 送込みセンサー
27 穀粒センサー
28 温度センサー
29 穀粒レベルセンサー(50t位置)
30 穀粒レベルセンサー(60t位置)
Claims (6)
- 熱風乾燥部と貯留部を備えた熱風乾燥機を初段の1号乾燥機から最終段の最終号乾燥機まで、それぞれの受入れ側と払い出し側を穀粒の流れに関して直列に接続し、1号乾燥機から投入した原料穀粒を各熱風乾燥機で順次乾燥させ、全体として1回通しで最終号乾燥機から目標水分値まで乾燥した水分調整完了穀粒を取り出す穀粒乾燥方法であって、原料穀粒の水分値に基づいて各段の熱風乾燥機に適切な穀粒の水分乾減率を割り振って乾燥を行うとともに、各段の熱風乾燥機では、投入される直前の穀粒水分値を計測し、その水分値と各乾燥機に設定されている送り出し時の水分値に基づいて、各熱風乾燥機の熱風乾燥部に供給する熱風の温度を、制御部に納めた穀粒水分-熱風温度テーブルから割り出し、熱風乾燥部に供給する熱風温度を調整するものであることを特徴とする穀粒乾燥方法。
- 穀粒の流れに関して直列に接続された複数の熱風乾燥機において、前段の熱風乾燥機の送出部を穀粒搬送路で前段乾燥機と後段乾燥機の受入れ部に接続し、この穀粒搬送路の中間に切換弁を配置して穀粒の流れを前段側と後段側に切り換えるものとし、当初前段側に切り換えてあり、前段の熱風乾燥機へ当初に熱風乾燥部の容量を越える量の穀粒が貯留されたとき、熱風乾燥部に位置する穀粒を貯留部へ戻す循環運転を行い、この位置の当初穀粒がすべて前記貯留部へ戻されたとき、前記切換弁を後段側に切り換えて連座運転とすることを特徴とした請求項1に記載の穀粒乾燥方法。
- 前記した前段の熱風乾燥機へ当初に熱風乾燥部の容量を越える量の穀粒が貯留されたこと及び前記した熱風乾燥部における当初穀粒がすべて貯留部へ戻されたことを計時により判定することを特徴とした請求項2に記載の穀粒乾燥方法。
- 前記した前段の熱風乾燥機へ当初に熱風乾燥部の容量を越える量の穀粒が貯留されたこと及び前記した熱風乾燥部における当初穀粒がすべて貯留部へ戻されたことをそれぞれのために配置した穀粒レベルセンサーからの信号により判定することを特徴とした請求項2に記載の穀粒乾燥方法。
- 前段の熱風乾燥機における熱風乾燥部における当初穀粒がすべて貯留部へ戻された後に後段の熱風乾燥機と揚穀機を駆動することを特徴とした請求項2~4のいずれか一つに記載の穀粒乾燥方法。
- 各段の熱風乾燥機が送り出す穀粒を検出する穀粒センサーを配置し、穀粒の送り出しが検出されないときその段の熱風乾燥機と揚穀機の稼動を停止することを特徴とした請求項2~5のいずれか一つに記載の穀粒乾燥方法。
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CN103808119A (zh) * | 2014-01-26 | 2014-05-21 | 梁群侦 | 一种环保节能烘干机 |
CN103808119B (zh) * | 2014-01-26 | 2016-05-11 | 梁群侦 | 一种环保节能烘干机 |
CN105043072A (zh) * | 2015-07-28 | 2015-11-11 | 洪知瑜 | 风能多功能分级干燥机 |
CN107883693A (zh) * | 2017-12-14 | 2018-04-06 | 无锡市尚德干燥设备有限公司 | 多段式烘干的海藻烘干机 |
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TWI550246B (zh) | 2016-09-21 |
KR102004669B1 (ko) | 2019-07-26 |
TW201400778A (zh) | 2014-01-01 |
CN104160232B (zh) | 2016-02-17 |
KR20140140054A (ko) | 2014-12-08 |
CN104160232A (zh) | 2014-11-19 |
KR20180114221A (ko) | 2018-10-17 |
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