JP2007322093A - Combustion burner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve combustion output of a rotary vaporization type burner usable in a grain dryer or the like. <P>SOLUTION: The rotary vaporization type burner is provided with a burning tube 28 provided in a front face side of a casing 27, a combustion board 36 with gas jet holes 36a, etc. provided in a front face outer circumference side of the burning tube 28, and a vaporizing tube 32 provided in a center part of the burning tube 28 and turned by a burner vaporizing tube motor M6. Atomized fuel migrating on an inner circumference face of the vaporizing tube 32 by radiation heat of combustion flame of the combustion board 36 is gasified, guided to a rear face of the combustion board 36, jetted out through the gas jet holes 36a, etc., and burned as blue flame. A motor rotational speed control means 51 is provided for turning the burner vaporizing tube motor M6 for vaporizing tube 32 turning at 3600 revolutions per minute or more, and turning the vaporizing tube 32 at 3600 revolutions per minute or more. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a combustion burner and can be used for a grain dryer or the like.

In a combustion burner of a grain dryer, a combustion cylinder provided on the front side of the casing, a combustion disc with a gas ejection hole provided on the front outer peripheral side of the combustion cylinder, and a central portion of the combustion cylinder A gasification cylinder that is rotated by a burner vaporization cylinder motor, gasifies atomized fuel that moves to the inner peripheral surface of the vaporization cylinder by radiant heat from the combustion flame of the combustion disk, leads to the back of the combustion disk, and passes through the gas ejection hole A rotary vaporization burner that is jetted to the side and burned with blue fire is known (Patent Document 1).
JP-A-8-128633

  In the conventional vaporization type burner, the burner vaporization cylinder motor for rotating the vaporization cylinder is driven by a commercial power source, and at a frequency of 60 Hz, the liquid fuel is vaporized while rotating at 3500 minutes per minute. was there.

  Therefore, the present invention is intended to improve the combustion output of the vaporization type burner and increase the combustion amount in the vaporization cylinder of the same size.

  The invention of claim 1 comprises a vaporizing cylinder (32) provided at the center of the combustion cylinder (28) and rotated by a burner vaporizing cylinder motor (M6), and supplying liquid fuel to the vaporizing cylinder (32). In the combustion burner that gasifies and burns the liquid fuel that moves on the inner peripheral surface of the rotating vaporizing cylinder (32), the rotational speed control means (51) controls the rotational speed of the burner vaporizing cylinder motor (M6). ), And the vaporizing cylinder motor (M6) is rotated at 3600 revolutions per minute or more.

  According to the above configuration, when the burner vaporizing cylinder motor (M6) and the vaporizing cylinder (32) are rotated at 3600 revolutions per minute or more by the motor rotation speed control means (51), the liquid moves on the inner peripheral surface of the vaporizing cylinder (32). Fuel is gasified and burned.

  According to a second aspect of the present invention, there is provided the rotary vaporization burner according to the first aspect, wherein the motor rotation speed control means (51) is a pulse width modulation method using an inverter or a pulse amplitude modulation method.

  According to the above configuration, in addition to the operation of the first aspect of the invention, the commercial power supply (AC power supply) is converted to a direct current by the rectifier circuit (51a) by the motor rotation speed control means (51) of the pulse width modulation method by the inverter. It is converted and applied to the inverter IC (51b) and driven at a frequency higher than that of the commercial power source, for example, an AC motor driving frequency of 70 Hertz, or by the pulse amplitude modulation type motor rotational speed control means (51). The power is converted into direct current by the rectifier circuit (51a), applied to the inverter IC (51b) via the switching circuit (51c), and driven by, for example, an alternating current motor drive frequency of 70 Hertz, and the burner vaporizing cylinder motor (M6) The vaporizing cylinder (32) is rotated at a speed of 4100 or more per minute.

  According to the first aspect of the present invention, the film thickness of the liquid fuel (white kerosene) flowing on the inner wall of the vaporizing cylinder (32) is reduced by rotating the vaporizing cylinder (32) at a high speed. Vaporization capability is increased by promoting the heat transfer action based on the improvement of the stirring action of the combustion gas in contact with the outer wall, and high output can be realized by a burner of the same size. Further, the mixing of the vaporized fuel and the combustion air is promoted by the high-speed rotation, and the blue combustion can be performed with almost no red fire combustion even in the vicinity of the theoretical air amount.

  In addition to the effect of the invention of claim 1, the invention of claim 2 can use the motor rotation speed control means (51) and a versatile and low-cost AC induction motor, and is inexpensive. can do.

Embodiments of the present invention will be described below with reference to the drawings.
First, based on FIG.1 and FIG.2, the whole structure of the circulation type grain dryer which implements this invention is demonstrated.

  Reference numeral 1 denotes a machine frame of a grain dryer. In the machine frame 1, a storage chamber 2, a drying chamber 3, and a grain collection chamber 4 are sequentially arranged from the upper side to the lower side. In the drying chamber 3, left and right grain flow passages 9, 9 are formed. Inside the left and right grain flow passages 9, 9, a hot air chamber 6 leading to the burner wind tunnel on the burner 5 side is arranged, and the grain flow passages 9, 9 are provided. The left and right exhaust chambers 8 and 8 leading to the fan body on the side of the suction exhaust fan 7 are disposed on the left and right sides, and a feeding valve 10 is provided at the lower end joining portion of each grain flow passage 9 and 9. By reciprocating rotation, the grain is allowed to flow down while being fed out by a predetermined amount, and the grain is soaked in hot air to be dried.

  On the outer side of the machine frame 1, an elevator 11 is erected so that the grains collected on one side of the front and rear sides of the grain collection room 4 are returned to the storage room 2. In this elevator 11, a bucket belt 13 is wound around a driving pulley 12 a and a driven pulley (not shown) that are vertically pivoted, and a dried grain is transferred to the front and rear side by a lower conveying device 14 provided at the bottom of the cereal collection chamber 4. The elevator 11 is configured to raise the cereal. Grains that have been cerealed by the elevator 11 are supplied to the starting end side of the upper conveying device 16 from the threshing throw 11a of the elevator 11, and are further fed laterally by the upper conveying device 16 to the upper central portion of the storage chamber 2. It is configured so as to be sent to the rotating diffusion plate 18 provided and diffused and dropped into the storage chamber 2.

  The grain circulation system composed of the elevator 11, the lower transport device 14, and the upper transport device 16 is driven by an elevator motor (not shown) disposed on the upper frame of the elevator 11. In addition, an intake port (not shown) is provided in a wall portion of the elevator 11 in the middle of the upper and lower portions, and an interval between the ascending stroke and the descending stroke of the bucket belt 13, and a moisture meter 26 is provided below the intake port (not shown). Is detachably disposed. The moisture meter 26 is a known device that compresses and pulverizes sample grains one by one between a pair of electrode rolls, and electrically converts the resistance value into a moisture value of the grain.

Next, the operation of the grain dryer will be described.
A predetermined amount of grain is put into the storage chamber 2 by using the elevator 11 from a holding hopper (not shown). Next, the grain type, the dry finish moisture value, etc. are set and the drying operation is started. Grains in the storage chamber 2 flow down through the drying chamber 3 and flow down into the collection chamber 4 while taking hot air. The cereal dried by the hot air is transferred to one side by the lower conveying device 14, then cerealed by the elevator 11, taken over by the upper conveying device 16, and circulated again to the storage chamber 2 to undergo a tempering action for a while. When the finishing moisture value is reached while repeating such a process, the drying operation is finished.

Next, the burner 5 will be described with reference to FIGS.
The burner 5 is configured as a rotary vaporizing burner and is disposed in the burner wind tunnel 25. A combustion cylinder 28 is provided on the front side of the casing 27, a burner vaporizing cylinder motor M6 is provided in the casing 27, and an inverted conical diffuser 31 is attached to a motor shaft 30 protruding in front of the burner vaporizing cylinder motor M6. A vaporizing cylinder 32 is attached so as to cover the periphery of the diffusing body 31, and a guide plate 33 is attached to the open side periphery of the vaporizing cylinder 32 with an ignition fuel scattering gap interposed therebetween. An extension is provided so as to diffuse to the side, and the atomized fuel is guided to the outer peripheral side of the combustion disc 36.

  Further, a fixed blowing cylinder 35 is provided on the inner peripheral portion of the vaporizing cylinder 32, a blowing fan 34 for blowing combustion air is disposed below the burner wind tunnel 25, and the blowing guide cylinder 35a is provided from the blowing fan 34. Combustion air is sent to the blower cylinder 35 via the. A combustion disc 36 is fitted and mounted on the front surface of the center of the combustion cylinder 28. The combustion disc 36 is provided with a plurality of gas ejection holes 36a,. Further, the combustion cylinder 28 is formed with a bulging portion 28a that bulges to the outer peripheral side when viewed from the front, and an igniter 38 as an ignition means comprising a pair of electrode portions is provided on the bulging portion 28a and supplied from a nozzle 39. The igniter 38 ignites the kerosene atomized fuel. Reference numeral 40 denotes a flame rod that detects the presence or absence of a combustion flame, and detects the flame current during combustion and outputs it to the control unit.

  A fuel pump 46 is provided above the blowing guide cylinder 35a, and fuel kerosene is supplied to the diffuser 31 through the nozzle 39 by driving the fuel pump 46, and is ignited and ignited and combusted by energization of the igniter 38. ing.

  In the drying operation, the burner 5 starts combustion by energizing and igniting the igniter 38 to the fuel supplied from the fuel pump 46. That is, the vaporizing cylinder 32 is rotated by the rotation of the burner vaporizing cylinder motor M6, the blower fan 34 is rotated by the rotation of the fan motor M5 for supplying combustion air, and the combustion air is introduced into the blower 35 and the like. Further, the fuel from the nozzle 39 is atomized while colliding with the diffusing body 31 rotating at high speed, and flows into the guide body 33 from the ignition fuel scattering gap while diffusing and flowing along the inner peripheral surface of the vaporizing cylinder 32. Ignited by the igniter 38. Next, the atomized fuel moving on the inner peripheral surface of the vaporizing cylinder 32 by the radiant heat generated by the combustion flame is gasified and guided to the back surface of the combustion disk 36, and is ejected to the surface side through the gas ejection holes 36a,. Burn with.

Next, a control block configuration will be described with reference to FIG.
A control box 45 is provided above the burner wind tunnel 25, and a control unit 49 is provided in the control box 45. Various switches and sensors are provided on the input side of the control unit 49. That is, for the input of the control unit 49, the grain type changeover switch SW1, the tension switch SW2, the drying switch SW3, the discharge switch SW4, the stop switch SW5, and the fuel used for setting the combustion difficulty level of the fuel to be used are input via the input circuit. The characteristic switching means SW6 is connected, and the outside air temperature of the outside air temperature sensor SE1, the stretch amount detection sensor SE2, the hot air temperature sensor SE3, the grain temperature sensor SE4, and the burner wind tunnel 25 is connected via the A / D converter. An outside air amount detecting means SE5 to detect, a moisture meter 26, and a frame rod SE6 are connected.

  Further, a valve motor M1 is connected to the output side of the control unit 49 through a variable means, an elevator motor M2, a blower motor M3, and a moisture meter motor M4 are connected through an output circuit, and for combustion through the variable means. A fan motor M5 for supplying air and a burner vaporizing cylinder motor M6 are connected, and a fuel pump 46 for fuel supply, a fuel valve 47, and an igniter 38 are connected through an output circuit, and a display is provided through an output circuit. The part 48 is connected.

  The burner drive signal of the control unit 49 includes an ON / OFF signal and a large / small supply signal of the fuel pump 46, a rotation speed command signal of the burner vaporizing cylinder motor M6, a rotation speed command signal of the fan motor M5, an energization signal of the igniter 38, etc. The liquid fuel is vaporized and combusted by synchronously controlling the fuel supply amount, the combustion air supply amount, and the vaporizing cylinder rotational speed.

  Further, during the drying operation, the hot-air set temperature preset and stored is compared with the hot-air temperature detected by the hot-air temperature sensor SE3, and the fuel for fuel supply that is periodically turned on so that the difference becomes small The drying operation is performed while changing and controlling the on-time signal of the pump 46 so that the drying operation is stopped when the grain moisture reaches the final moisture value.

Next, the rotational speed control of the burner vaporizing cylinder motor M6 of the rotary vaporizing burner 5 will be described with reference to FIG.
In this embodiment, the rotational speed of the motor is controlled so that the burner vaporizing cylinder motor M6 of the rotary vaporizing burner 5 is rotated at 3600 rpm or more, and the vaporizing cylinder 32 for vaporizing liquid fuel is rotated at 3600 rpm or more. Means 51 are provided. As the motor rotation speed control means 51, a pulse width modulation system using an inverter or a pulse amplitude modulation system is adopted.

  A rotary vaporization burner used for a grain dryer can be used for a long period of time in an environment with a large temperature change such as outdoors because a heat source with a relatively high output can be obtained from its combustion type. In the market, a rotary vaporizer burner has recently been required to have a compact but high output, and it is desired to increase the combustion amount with the same vaporization cylinder size.

  In the conventional apparatus, a burner vaporizing cylinder motor is driven by a commercial power source to rotate the vaporizing cylinder. Then, for example, an inverted conical diffuser (maximum diameter of 40 mm) is attached to the motor shaft of the burner vaporizing cylinder motor, and the vaporizing cylinder (the base side diameter is 70 mm, the tip side diameter is 60 mm) so as to cover the periphery of the diffuser. The gas mixing cylinder (maximum diameter of 92 mm) for guiding the atomized fuel is attached to the open side periphery of the vaporizing cylinder so as to diffuse obliquely forward and outward, and a commercial power source ( The burner vaporizing cylinder motor was driven at 60 Hz, and the motor shaft and the vaporizing cylinder were rotated at about 3500 revolutions per minute for combustion.

  In this embodiment, as shown in FIG. 7A, the motor is controlled and driven by a pulse width modulation method. That is, commercial power (50/60 Hz AC power) is converted into direct current by the rectifier circuit 51a, applied to the inverter IC 51b, driven at the AC motor drive frequency 70, and the rotational speed of the burner vaporizing cylinder motor M6 is 4100 per minute. The vaporizing cylinder 32 is rotated as rotation.

  Further, as shown in FIG. 7B, the motor may be controlled and driven by a pulse amplitude modulation method. Commercial power (50/60 Hz AC power) is converted into direct current by the rectifier circuit 51a, applied to the inverter IC 51b via the switching circuit 51c, driven at an AC motor drive frequency of 70 Hz, and the burner vaporizing cylinder motor M6 The vaporizing cylinder 32 is rotated at a rotational speed of about 4100 revolutions per minute.

  By rotating at high speed in this way, the film thickness of the liquid fuel (white kerosene) flowing on the inner wall of the vaporizing cylinder 32 is reduced, and the heat transfer action based on the improvement of the stirring action of the combustion gas in contact with the outer wall of the vaporizing cylinder 32 Vaporization capability is increased by promoting this, and high output can be realized by a burner of the same size. Further, the mixing of the vaporized fuel and the combustion air is promoted by the high speed rotation, and the blue combustion can be performed with almost no red fire combustion even in the vicinity of the theoretical air amount.

  Further, as shown in FIG. 8, a flow restricting means 55 for restricting the flow of the liquid fuel may be provided on the inner wall of the vaporizing cylinder 32 that rotates at a high speed. For example, as shown in FIG. 8A, the flow restricting means 55 is formed by attaching a wire mesh 55a to the inner wall of the vaporizing cylinder 32, or roughening the inner wall of the vaporizing cylinder 32 by a press, or FIG. As shown in (B), one or a plurality of flow restricting plates 55 with annular upright pieces 55b in the direction intersecting with the axial center are attached to the inner wall of the vaporizing cylinder 32.

  If the inner wall of the vaporizing cylinder 32 is left as a smooth surface, if a large amount of liquid fuel is supplied to the vaporizing cylinder 32 that rotates at a high speed so that large combustion occurs, the liquid fuel is not vaporized and remains for a short time. In this case, the lower end portion of the vaporizing cylinder 32 may be reached and scattered from the ignition fuel scattering gap to the combustion plate 36 as a liquid fuel, causing a problem of burning while dotted with red fire combustion.

  However, according to the above configuration, by applying the flow restricting means 55 to the inner wall of the vaporizing cylinder 32, the flow to the lower side of the liquid fuel film on the inner wall of the vaporizing cylinder 32 can be restricted to promote vaporization. You can prevent problems.

Next, combustion control of the burner 5 will be described.
Use fuel characteristic switching means SW6 is provided, and for example, the difficulty of vaporization due to the viscosity of the fuel is input to the control unit 49. When the vaporization difficulty level is low, the commercial power supply is converted into direct current by the rectifier circuit 51a by the burner vaporizing cylinder motor rotation speed setting means 55 of the control unit 49 and applied to the inverter IC 51b, and the AC motor drive frequency is set to 55, for example. In Hertz, the rotational speed of the burner vaporizing cylinder motor M6 is set to about 3250 revolutions per minute.

  On the other hand, when the difficulty level is high, the commercial power is converted into direct current by the rectifier circuit 51a and applied to the inverter IC 51b, the AC motor drive frequency is set to, for example, 75 hertz, and the rotational speed of the burner vaporizing cylinder motor M6 is 4300 revolutions per minute. Set to.

  As described above, since the rotation speed of the burner vaporizing cylinder motor M6 is changed to be larger or smaller depending on the difficulty of vaporizing the liquid fuel, an appropriate film thickness can be formed in the vaporizing cylinder 32 and properly burned even with liquid fuels having different viscosities. it can.

Next, an embodiment of the drying control will be described based on FIG.
As shown in FIG. 9, outside air amount detection means 57 is provided above the burner 5 of the burner wind tunnel 25. As shown in FIG. 9B, the outside air amount detection means 57 is composed of an air guide cylinder 57a, a rotary impeller 57b, and a rotation speed detection means 57c constituted by, for example, a rotary encoder. The amount of outside air for drying the grains flowing into the burner wind tunnel 25 is detected. And the hot-air preset temperature which prescribes | regulates the heating amount according to the grain processing amount in relation to the magnitude of the amount of detected outside air is changed.

  In the grain dryer, the amount of outside air flowing through the burner wind tunnel 25 may fluctuate greatly depending on the installation conditions such as bending of the exhaust duct and the ventilation resistance of the type of dry grain. Accordingly, when drying is performed at a predetermined hot air temperature, the drying operation is performed with an amount of outside air that is greater than or less than a predetermined amount of outside air, and the amount of heating to the grain becomes excessive or excessive, resulting in excessive drying. Troubles such as cracking of the body, deterioration of taste, or extension of the drying finish time due to insufficient drying occur. Therefore, the amount of the outside air for drying that passes through the burner wind tunnel 25 is detected by the outside air amount detecting means 57, and the hot air set temperature is changed depending on the amount of the detected amount so as to solve the above problem.

  For example, in the case of the drying operation of the soot, when a hot air temperature setting standard is determined in advance as shown in FIG. The temperature is corrected to the hot air set temperature, and when a decrease of 20% or more with respect to the standard outside air amount is detected, it is corrected to the hot air set temperature increased by a predetermined temperature according to the drying processing amount.

Thus, the said trouble can be eliminated by carrying out increase / decrease correction of hot air preset temperature by increase / decrease in the amount of external air for drying.
In addition, when the hot air set temperature is corrected to increase or decrease by increasing or decreasing the amount of outside air for drying, the reference temperature in FIG. 13 may be separately corrected according to the grain type of the drying operation. For example, as shown in FIG. 14, assuming that the amount of dry outside air at the time of ventilation drying in the state where the burner is stopped is 100%, in the case of hot air drying of the rod, the processing amount is 1 ton when the amount of outside air is too small. In this case, the hot air set temperature is corrected to 43 degrees C, and the hot air set temperature is corrected to "37 degrees C" when the processing amount is 1 ton when the outside air amount is excessive.

  According to the above configuration, since the hot air temperature is set separately corresponding to the increase or decrease in the amount of outside air for each dry grain, it is possible to match the amount of outside air for drying with the porosity coming from the shape of the grain. And an appropriate hot air temperature can be set, and the drying time can be optimized.

Next, another control using the detection information of the outside air amount detection means 57 will be described based on FIG.
As shown in FIG. 10, when the control is started, the blower motor M3 is turned on to drive the suction / exhaust fan 7 (step S1), and then the elevator motor M2 is turned on to drive the grain conveyance system (step S1). S2) From the detection information of the outside air amount detecting means 57 (step S3), the outside air amount Q is calculated (step S4). Next, when the detected outside air amount Q is larger than the lower limit amount (QL) (step S5) and smaller than the upper limit amount (QH) (step S6), the outside air amount is determined to be appropriate, and then the hot air temperature setting condition (Step S7), the hot air set temperature is calculated (step S8), the operation control of the burner 5 is started (step S10), and the routine is shifted to normal drying control.

  Further, in step S5, when the detected outside air amount Q is smaller than the lower limit amount (QL), it is determined that there is an abnormality, and an “outside air amount shortage alarm display” is performed on the display unit 48 (step S11). In step S6, when the detected outside air amount Q is larger than the upper limit amount (QH), it is determined that there is an abnormality and an “external air amount excessive alarm display” is displayed (step S12), and then the operation of the burner 5 is stopped. (Step S13), it shifts to ventilation drying (Step S14).

According to the said structure, abnormality determination of the operating condition of a grain dryer can be performed, using the detection information of the external air quantity detection means 57, simplifying a structure and reducing cost.
Moreover, when displaying the alarm of the abnormal operation, the lower limit amount (QL) and the upper limit amount (QH) of the outside air amount may be set separately according to the type of grain being dried. For example, as shown in FIG. 15, the amount of dry outside air during the drying operation of the soot when the burner is stopped is set to 100%, and in the case of hot air drying of the soot, the lower limit amount (QL) of the outside air amount is set to 80. %, The upper limit (QH) is corrected to 130%, and, in the case of hot air drying of wheat, the lower limit (QL) of the outside air volume is corrected to 70%, and the upper limit (QH) is The correction is made to 120%.

  According to the above configuration, since the lower limit amount (QL) and the upper limit amount (QH) of the outside air amount are set separately for each dry grain, it can be adjusted to the porosity that comes from the shape of the grain, A highly accurate abnormality notification can be performed.

Next, another control configuration will be described based on FIG.
In this embodiment, the rotational speed of the fan motor M5 for supplying combustion air is adjusted in accordance with the detected amount of the outside air amount detecting means 57, and the amount of air blown by the blower fan 34 is adjusted.

  If the exhaust duct is bent in two stages and the drying air passing through the burner wind tunnel 25 decreases, the furnace body temperature of the burner 5 rises greatly, and the amount of combustion air also decreases and is incomplete. Red fire burning. However, by adjusting the rotational speed of the fan motor M5 for supplying combustion air in accordance with a decrease in the detected amount of the outside air amount detecting means 57 and increasing the amount of air blown by the blower fan 34, the red fire of the burner 5 is increased. Combustion can be prevented and proper green fire combustion can be maintained.

  Further, when the exhaust air of the suction exhaust fan 7 is forcibly exhausted by the collective fan (not shown) through the centralized piping and the amount of drying air increases, the increase in the detected amount of the outside air amount detecting means 57 By adjusting the rotational speed of the fan motor M5 for supplying combustion air and reducing the air flow of the blower fan 34, the burner 5 can be prevented from being burned and misfired to maintain proper blue fire combustion. I can do it.

FIG. 11 is a graph showing the relationship between the amount of outside air for drying detected by the outside air amount detecting means 57 and the rotational speed of the blower fan 34 for supplying combustion air.
Next, another control configuration will be described based on FIG.

In this embodiment, the fuel supply amount at the time of initial combustion to the burner 5 is adjusted according to the detection amount of the outside air amount detection means 57 so as to start combustion smoothly.
When the exhaust duct is bent in two stages and the drying air passing through the burner wind tunnel 25 is reduced, the furnace body temperature of the burner 5 is greatly increased, and the amount of combustion air is also reduced, resulting in abnormal overheating. It becomes a combustion state. However, the combustion of the burner 5 can be started smoothly by reducing the fuel supply amount at the time of initial combustion according to the decrease in the detection amount of the outside air amount detection means 57.

  In addition, when the exhaust air of the suction exhaust fan 7 is forcibly exhausted by the collective fan (not shown) through the centralized piping and the amount of drying air increases, the fuel concentration at the time of ignition decreases, and the ignition delay or The furnace temperature rises slowly and the ignition is poor. However, by increasing the fuel pump 467 to increase the fuel supply amount in accordance with the increase in the detection amount of the outside air amount detection means 57, it is possible to start the combustion smoothly, and the burner 5 has poor ignition or lift. Combustion can be prevented.

FIG. 12 is a graph showing the relationship between the amount of outside air for drying detected by the outside air amount detecting means 57 and the initial fuel supply amount of the burner.
Next, another control configuration will be described.

In this embodiment, the supply amount of the fuel supply amount limiting means to the burner 5 is adjusted according to the detection amount of the outside air amount detection means 57.
When the exhaust duct is bent in two stages and the drying air passing through the burner wind tunnel 25 decreases, the furnace body temperature of the burner 5 rises greatly, and abnormal combustion due to overheating occurs in the maximum combustion state. In addition, the amount of combustion air is reduced and an abnormal overheated combustion state occurs. However, proper combustion of the burner 5 can be maintained by limiting the maximum fuel supply amount of the fuel valve 47 in accordance with a decrease in the detection amount of the outside air amount detection means 57.

  On the contrary, when the exhaust air of the suction exhaust fan 7 is forcibly exhausted by the collective fan (not shown) by the centralized piping and the amount of drying air increases, the furnace temperature of the burner 5 decreases greatly and is minimal. In the combustion state, problems such as lift combustion and misfire occur due to overcooling. However, proper combustion of the burner 5 can be maintained by limiting the minimum fuel supply amount of the fuel pump 46 in accordance with the increase in the detection amount of the outside air amount detection means 57.

  FIG. 16 shows the relationship between the amount of outside air for drying detected by the outside air amount detecting means 57 and the maximum and minimum combustion amounts of the burner. This table shows the limit value proportional to the outside air volume for both the upper and lower limits, but depending on the burner type, it is not the maximum or only limit value. For example, even if the outside air amount increases, the maximum combustion amount is 3.0L. In some cases, the minimum combustion amount may be 0.6 L / h even when the amount of outside air is reduced.

Front view with part cut of grain dryer Grain dryer cutting side view Perspective view of burner Burner cut side view Burner cut side view Control block diagram Control block diagram Cutting side view of vaporizing cylinder (A) Cut side view of burner part (B) Cut side view of outside air amount detecting means flowchart A graph showing the relationship between the amount of outside air for drying detected by the outside air amount detecting means and the rotational speed of the blower fan 34 for supplying combustion air The graph which shows the relationship between the amount of outside air for drying detected by the amount of outside air detection means and the initial fuel supply amount of the burner. A table showing the criteria for correcting hot air set temperature by increasing or decreasing the amount of outside air for drying Table showing the criteria for each grain type when correcting the hot air set temperature by increasing or decreasing the amount of outside air for drying Table showing the standard of porosity for each grain type when correcting the hot air set temperature by increasing or decreasing the amount of air for drying Table showing the relationship between the amount of outside air for drying detected by the outside air amount detection means and the maximum and minimum combustion amounts of the burner

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grain dryer 2 Storage chamber 3 Drying chamber 4 Grain collection chamber 5 Burner 6 Hot air chamber 7 Suction exhaust fan 8 Ventilation chamber 9 Grain flow passage 10 Feed valve 27 Casing 28 Combustion cylinder 32 Vaporization cylinder 36 Combustion board 36a Gas ejection hole 51 Motor rotation speed control means 51a Rectifier circuit 51b Inverter IC
51c Switching circuit M6 burner vaporizing cylinder motor

Claims (2)

  A vaporizing cylinder (32) is provided at the center of the combustion cylinder (28) and is rotated by a burner vaporizing cylinder motor (M6). Liquid fuel is supplied to the vaporizing cylinder (32), and the rotating vaporizing cylinder ( 32) In the combustion burner that gasifies and burns the liquid fuel that moves on the inner peripheral surface of 32), a rotation speed control means (51) for controlling the rotation speed of the burner vaporizing cylinder motor (M6) is provided, and the vaporizing cylinder A combustion burner characterized in that the motor (M6) is rotated at 3600 rpm or more.   The combustion burner according to claim 1, wherein the motor rotation speed control means (51) is a pulse width modulation system or a pulse amplitude modulation system using an inverter.

Images