JP3884628B2 - Garbage disposal method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a garbage disposal method and apparatus for drying garbage by using combustion heat of fuel gas or the like.
[0002]
[Prior art]
Recently, garbage generated from kitchens and the like contains a large amount of moisture and the like, and can be reduced by removing the moisture and the like. Dried garbage can be discarded as normal combustible waste or reused as fertilizer.
[0003]
[Problems to be solved by the invention]
By the way, in the drying process of garbage, when a large amount of oil and fat such as lard is vaporized and flows to the condenser side during drying, there is a possibility that it is condensed by cooling and solidified in the condenser.
[0004]
Then, this invention makes it a subject to provide the garbage disposal method and the apparatus which avoided the problem by the condensation of fats and oils.
[0005]
[Means for Solving the Problems]
In the garbage processing method of the present invention, the garbage (2) is heated in the treatment tank (4), and the vapor (43) generated from the garbage in the treatment tank is condensed by the condensing means (condenser 44). And return to the treatment tank A method for treating garbage by drying the garbage in the treatment tank, the step of condensing the steam by cooling the condensation means, the step of monitoring the temperature of the steam passing through the condensation means, and the condensation And stopping the cooling of the condensing means when the temperature difference between the inlet side temperature and the outlet side temperature of the steam passing through the means is a predetermined value or more, and heating the condensing means with the steam, By heating the condensing means by stopping the cooling, the oil and fat in the condensing means is softened and discharged out of the condensing means. That is, the steam generated in the treatment tank contains the moisture and fats and oils of garbage. This vapor flows to the condensing means, is cooled and condensed. The state of condensation can be known from the temperature difference between the inlet side temperature and the outlet side temperature of the condensing means. Therefore, if the cooling of the condensing means is controlled in accordance with this temperature difference, the fat and oil solidified by condensation in the condensing means can be liquefied and discharged.
[0006]
The garbage processing apparatus of the present invention includes a treatment tank (4) that accommodates garbage (2), and heating means (burners 20, 21) that heat the garbage in the treatment tank by the combustion heat of the fuel gas (G). ), Condensing means (condenser 44) for condensing the steam (43) generated in the processing tank, and the condensing means for guiding the steam generated in the processing tank and condensing in the condensing means, Circulating means (outward pipe 46, return pipe 48) for returning to the processing tank, and cooling means (cooling fans 50, 52) for cooling the condensing means, The inlet side temperature detecting means (the inlet side temperature sensor 60) for detecting the inlet side temperature of the condensing means; the outlet side temperature detecting means (the outlet side temperature sensor 66) for detecting the outlet side temperature of the condensing means; When the temperature difference between the inlet side temperature and the outlet side temperature of the condensing means reaches a predetermined temperature, by stopping the operation of the cooling means, the condensing means is heated by the steam, and the fats and oils are softened from the condensing means Control means (control device 88) for discharging It is characterized by that. That is, the fat and oil in the steam generated from the garbage in the treatment tank by heating by the heating means flows from the treatment tank to the condensation means through the circulation means, and is cooled and condensed. The state of condensation can be known from the temperature difference between the inlet side temperature and the outlet side temperature of the condensing means. Therefore, the cooling of the condensing means is controlled in accordance with this temperature difference, and the fat and oil solidified by condensation in the condensing means can be liquefied. The liquefied oil and fat can be easily discharged from the condensing means, and the function of the condensing means is not deteriorated.
[0007]
In the garbage processing apparatus of the present invention, Entrance temperature of the condensing means When the value exceeds a predetermined value, the cooling means is stopped. That is, by stopping the cooling means, the temperature of the condensing means can be raised, and the softening and liquefaction of the condensed oil and fat can be promoted.
[0008]
In the garbage processing apparatus of the present invention, the cooling means is Supplying cooling air to the condensing means It is characterized by comprising fans (cooling fans 50 and 52). That is, a fan can be used as the means for cooling the condensing means, and the rotation of the fan can be controlled by a motor, and the cooling of the condensing means can be easily controlled.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show an embodiment of a garbage disposal method and apparatus according to the present invention, FIG. 1 shows a garbage disposal apparatus, and FIG. 2 shows a control apparatus.
[0010]
For example, a cylindrical container is used for the treatment tank 4 in which the garbage 2 to be treated is accommodated, and a stirring impeller 6 is provided in the treatment tank 4 as a stirring means for stirring the garbage 2. . The stirring impeller 6 has, for example, a plurality of spiral stirring blades attached to a rotation shaft, and the rotation shaft is rotatably supported by a bearing 8 provided on the side surface of the processing tank 4. A pulley 12 for receiving the rotational force from is attached. A drive chain 16 is suspended between the pulley 12 and the drive pulley 14 on the stirring motor 10 side. That is, a desired rotation is applied to the stirring impeller 6 by the stirring motor 10, and when the stirring impeller 6 rotates, the garbage 2 in the treatment tank 4 is stirred and pulverized.
[0011]
A plurality of burners 20 and 21 are installed in the combustion chamber 18 provided on the bottom side of the processing tank 4 as heating means. Fuel gas G is supplied to the burners 20 and 21 from a fuel supply pipe 26 provided with a fuel main valve 22 and a proportional valve 24, and a burner switching valve 28 for switching combustion is provided on the burner 21 side. That is, the supply amount of the fuel gas G to each burner 20, 21 can be increased or decreased stepwise or continuously using the proportional valve 24, and both burners 20, 21 are combusted or opened by opening / closing the burner switching valve 28. Single combustion (semi-combustion) of the burner 20 is selected. In addition, an ignition plug 30 for igniting the fuel gas G is installed, and an air supply fan 32 is installed. The air supply fan 32 is rotated by a motor 34 and air necessary for combustion is supplied to the combustion chamber 18. The
[0012]
Further, an exhaust passage 38 is formed in the peripheral wall portion of the processing tank 4 so as to be wrapped with the exhaust gas 36 generated in the combustion chamber 18, and the exhaust gas 36 is discharged into the outside air in a part of the exhaust passage 38. A tube 40 is formed. For this reason, the lower surface side of the treatment tank 4 is directly heated by the combustion heat of both the burners 20, 21 of the combustion chamber 18 or one of the burners 20, and is encased in the exhaust gas 36, so that the entire portion is heated from the peripheral surface. . The exhaust pipe 40 is provided with an exhaust temperature sensor 42 for detecting the temperature of the exhaust gas 36 discharged from the exhaust pipe 40, that is, the exhaust temperature. This exhaust temperature indirectly indicates the combustion state of the combustion chamber 18 and the heat treatment temperature of the garbage 2 in the treatment tank 4, and the treatment temperature and the like can be known by detecting the exhaust temperature.
[0013]
Then, a condenser (condenser) 44 is installed as a heat dissipating means for cooling and condensing the steam 43 generated in the processing tank 4, a cooling means or a condensing means. The condenser 44 and the processing tank 4 serve as a circulating means. The forward pipe 46 and the return pipe 48 are connected. The condenser 44 is provided with, for example, two cooling fans 50 and 52 as cooling means, and these cooling fans 50 and 52 are driven by motors 54 and 56 as driving means. In this embodiment, the condenser 44 is of a vertical type in which the heat radiating surface is in the horizontal direction, and the condensed water 59 obtained by cooling the steam 43 in the first steam-water separator 58 provided on the bottom surface side thereof. Is guided.
[0014]
An inlet side temperature sensor 60 for detecting the inlet side temperature is attached to the inlet side of the condenser 44 to which the outgoing pipe 46 is connected, and a return pipe 48 connected to the steam / water separation unit 58 side of the condenser 44. A circulation fan 62 is attached as means for circulating the steam 43, and this circulation fan 62 is driven by a motor 64 as drive means. An outlet temperature sensor 66 for detecting the outlet temperature of the condenser 44 is installed adjacent to the circulation fan 62. That is, the exhaust temperature detected by the exhaust temperature sensor 42 and the inlet side temperature of the condenser 44 detected by the inlet side temperature sensor 60 represent the temperatures in the processing tank 4. By controlling the degree of opening of the proportional valve 24 and the combustion of the burners 20 and 21 each time the temperature rises, the burn in the treatment tank 4 can be prevented and the amount of heat necessary and appropriate for drying the garbage 2 is controlled. be able to. Further, the detected temperature of the outlet side temperature sensor 66 represents the cooling state of the condenser 44. Based on this detected temperature, both the cooling fans 50 and 52 are operated, only the cooling fan 50 is stopped, and the cooling fans 50 and 52 are stopped. The cooling power can be controlled by selecting an operation pattern such as stopping both of them, and the prevention of condensation and solidification of the oil / fat content due to supercooling and the softening and fluidization of the solidified oil / fat can be promoted.
[0015]
A second steam / water separator 70 is connected via a branch pipe 68 provided in the middle of the return pipe 48, and the steam / water separator 70 moves the condensed odor gas 72 to the combustion chamber 18 side. It is connected to the combustion chamber 18 via a deodorizing pipe 74 that leads, and is connected to a drain pipe 76 on the side of the steam / water separator 58 via a drain recovery pipe 78. The air / water separator 70 is provided with a deodorizing fan 80 that forcibly guides the odor gas 72 toward the deodorizing pipe 74, and the deodorizing fan 80 is driven by a motor 82. That is, in the steam / water separator 70, the condensed water 59 that has not been separated by the steam / water separator 58 is further separated from the odor gas 72, and the odor gas 72 is guided to the combustion chamber 18 through the deodorization pipe 74 and burns, and the odor The water is removed and exhausted together with the exhaust gas 36, and the condensed water 59 is led to the drain pipe 76 through the drain collection pipe 78. Be . The drain pipe 76 and the drain collection pipe 78 are provided with U-shaped traps 84 and 86 for blocking odor, respectively, and the return pipe 48 and the outside air are blocked by using condensed water 59.
[0016]
Then, the operation command from the operation switch 92, the exhaust temperature sensor 42, the detected temperature of the inlet temperature sensor 60, and other control inputs S are added to control the rotation of the motors 54 and 56 and the combustion control of the burners 20 and 21. A control device 88 is provided as a control means to perform. For example, as shown in FIG. 2, the control device 88 is provided with a control unit 90 configured by a microprocessor or the like that performs temperature control of the processing tank 4 and the condenser 44. Input signals are applied from the switch 92, the exhaust temperature sensor 42, the inlet side temperature sensor 60, and the outlet side temperature sensor 66, and the drive outputs output from the control unit 90 are the agitation motor 10, the fuel main valve 22, the proportional valve. 24, the burner switching valve 28, the spark plug 30, the motor 34 of the air supply fan 32, the motors 54 and 56 of the cooling fans 50 and 52, the motor 64 of the circulation fan 62, and the motor 82 of the deodorizing fan 80.
[0017]
Next, the garbage processing method and the operation of the apparatus will be described with reference to the flowcharts shown in FIGS. In each figure, A, B, C, D and E are connectors between the flowcharts.
[0018]
Steps S <b> 1 to S <b> 5, which are first-stage routines, are routines showing the heating process for the garbage 2 with the maximum combustion amount.
[0019]
In step S1, after the preparation for treatment such as closing of the lid of the treatment tank 4 into which the garbage 2 has been thrown in is completed, the fuel source valve 22 is opened and the proportional valve 24 is set to the ignition opening, and at the same time, the burner switching valve 28 is turned on. The spark plug 30 is operated to ignite the burners 20 and 21, and then the proportional valve 24 is opened to shift to maximum combustion. In step S2, the operation of the cooling fan 50 is stopped, the cooling fan 52 is operated, and the circulation fan 62 and the deodorizing fan 80 are operated.
[0020]
At this time, combustion at the maximum combustion amount is performed in step S3, and the combustion amount H1 (kcal / h) is, for example, 15000 (kcal / h). The processing temperature in the processing tank 4 rapidly rises due to this combustion amount, and the garbage 2 in the processing tank 4 is stirred and pulverized while being heated by the rotation of the stirring motor 10. The steam 43 generated in the treatment tank 4 is circulated from the forward pipe 46 to the condenser 44 and cooled, and then returned to the treatment tank 4, and the condensed water 59 condensed in the condenser 44 is supplied from the steam / water separation unit 58. It flows into the drain pipe 76. Further, the odor gas 72 is led from the branch pipe 68 to the combustion chamber 18 through the deodorization pipe 74 and burns, and the condensed water 59 separated by the steam / water separation section 70 flows toward the drainage recovery pipe 78 side.
[0021]
Then, the processing temperature is monitored through the exhaust temperature and the inlet side temperature of the condenser 44. In step S4, it is monitored whether or not the combustion switching temperature has been reached, and the maximum combustion is maintained until the temperature is reached. For example, when the exhaust gas temperature reaches 180 ° C. as the combustion switching temperature, the process proceeds to step S5, the opening of the proportional valve 24 is reduced from the maximum opening, and the combustion amount is decreased. In this case, the combustion amount H3 (kcal / Reduce to h). The combustion amount H3 is, for example, 9000 (kcal / h), and the exhaust temperature can be controlled to be, for example, 190 ° C. or less due to such a decrease in the combustion amount, and the garbage 2 on the wall surface of the treatment tank 4 can be controlled. Can prevent burning. That is, when the exhaust temperature exceeds 190 ° C., the burning of the garbage 2 has been confirmed by experiments, and therefore, considering the overshoot of the temperature rise, 180 ° C. is selected as the exhaust temperature before reaching 190 ° C. Yes. Further, if the combustion amount H3 is set to 9000 (kcal / h), such a value is selected because there is no occurrence of undershoot due to a decrease in the amount of heat and the temperature can be increased quickly.
[0022]
Steps S6 to S19, which are second-stage routines, are combustion control routines for preventing burning of garbage 2 and solidification of oil and fat in the condenser 44, and steps S6 to S9 are for burning the treatment tank 4. And a combustion control necessary for the drying process. At this time, the reduction of the combustion amount causes the opening degree of the proportional valve 24 to be reduced stepwise, or is adjusted to a heat amount that does not cause burning by switching the burners 20 and 21.
[0023]
In step S6, it is determined whether the exhaust gas temperature is equal to or higher than a predetermined value in order to prevent the garbage 2 from being burnt. In this case, it is determined whether the exhaust temperature is a predetermined value, for example, 190 ° C. or higher, or the inlet temperature of the condenser 44 is a predetermined value, for example, 89 ° C. or higher. The process proceeds to step S7, and the combustion amount is decreased by a predetermined amount with H4 (kcal / h) as a lower limit value. For example, the predetermined amount is decreased by 1000 (kcal / h), and the lower limit H4 is set to 7000 (kcal / h), for example. By reducing the amount of combustion, the heating temperature of the garbage 2 can be temporarily reduced. By setting the combustion amount H4 as the lower limit, the amount of water evaporation of the garbage 2 is maintained, and the exhaust temperature is set to a predetermined value. For example, it can be controlled to 190 ° C. or lower.
[0024]
When the exhaust gas temperature is not higher than the predetermined value in step S6, or after the combustion amount is decreased by a predetermined amount in step S7, the process proceeds to step S8. In this step S8, it is determined whether or not the exhaust gas temperature is a predetermined value, for example, 180 ° C. or less. In this case, both the exhaust temperature and the inlet side temperature of the condenser 44 may be set as determination conditions, and it is determined whether or not the inlet side temperature has decreased to a predetermined value, for example, 85 ° C. or less. When the exhaust gas temperature or the exhaust gas temperature and the inlet temperature are not more than the predetermined values, the process proceeds to step S9, and the combustion amount is increased by a predetermined amount with H2 (kcal / h) as the upper limit value. For example, the predetermined amount is increased by 1000 (kcal / h), and the upper limit value H2 is set to 13000 (kcal / h), for example. As a result, it is possible to prevent a delay in the processing time of the garbage processing due to a shortage of heat, and to suppress the burning of the garbage 2.
[0025]
Steps S <b> 10 to S <b> 13 are a control routine for reducing the solidification amount of the fat and oil in the condenser 44. That is, if the outlet temperature of the condenser 44 is detected and the condenser 44 is supercooled from the detected temperature, the cooling fan 52 is selected from the operations of the cooling fans 50 and 52 to reduce the cooling capacity. If the cooling is insufficient, the cooling capacity is enhanced by switching from the single operation of the cooling fan 52 to the operation of the cooling fans 50 and 52.
[0026]
Therefore, in step S10, it is determined whether or not the outlet temperature of the condenser 44 is less than a predetermined lower limit value, for example, less than 60 ° C. Then, the cooling fan 50 is stopped, and the cooling power is reduced by the independent operation of the cooling fan 52. As a result, the temperature of the condenser 44 rises and solidification of the oil and fat is suppressed.
[0027]
In step S10, if the outlet side temperature of the condenser 44 is not a predetermined value, for example, less than 60 ° C., the process proceeds to step S12, whether or not the outlet side temperature of the condenser 44 is equal to or higher than a predetermined upper limit value. In the embodiment, it is determined whether or not the temperature is 70 ° C. or higher. If the temperature is 70 ° C. or higher, the process proceeds to step S13, and the cooling fans 50 and 52 are operated to increase the cooling power. If the delivery temperature is less than 70 ° C., the process of step S13 is omitted and the process proceeds to step S14.
[0028]
In this way, by performing the processing of steps S10 to S13 and repeating the operation and operation stop of the cooling fan 50, the processing temperature in the processing tank 4 becomes a stable state, and the outlet temperature of the condenser 44 becomes a predetermined upper limit value. It changes within a predetermined temperature range between the predetermined lower limit values, that is, within a temperature range of 60 ° C to 70 ° C.
[0029]
Steps S14 to S19 are routines for removing the solid fats and oils when the function of the condenser 44 progresses with the solidified fats and oils. That is, in step S14, whether or not the temperature difference between the inlet side temperature and the outlet side temperature of the condenser 44 or the inlet side temperature has reached a predetermined value, in other words, the cleaning start temperature representing the closed state of the condenser 44. It is determined whether or not it is reached. For example, it is determined whether the temperature difference between the inlet side temperature and the outlet side temperature of the condenser 44 is a predetermined value, for example, 33 ° C., or the inlet side temperature is equal to or higher than a predetermined value, for example, 95 ° C. When it has reached, it transfers to step S15 and the cooling fans 50 and 52 are stopped. At this time, the cooling of the condenser 44 is stopped, the steam 43 flowing from the processing tank 4 through the outgoing pipe 46 heats the condenser 44, the oil and fat in the condenser 44 is dissolved and fluidized, and the drain pipe 76 Discharged.
[0030]
This cleaning process is continuously performed for a predetermined time. In step S16, it is determined whether or not a predetermined time, for example, about 7 minutes has elapsed since the cooling fans 50 and 52 are stopped, and the cooling fans 50 and 52 are stopped during the predetermined time. The time in this case is measured by repeating the processes of steps S15 and S16.
[0031]
When the predetermined time has elapsed, the process proceeds to step S17, and the operations of the cooling fans 50 and 52 are started. The operations of the cooling fans 50 and 52 are continued for a predetermined time in order to stabilize the temperature. Therefore, in step S18, after the operation of the cooling fans 50 and 52 is started, the passage of a predetermined time, for example, 10 minutes is waited to stabilize the temperature.
[0032]
After a predetermined time has elapsed from the start of the operation of the cooling fans 50 and 52, in step S19, it is determined whether or not the processing temperature in the processing tank 4 has reached the combustion switching temperature. In this case, the routine of steps S6 to S9 is performed. Thus, it is determined whether the combustion amount has decreased to a predetermined heat amount H4, for example, 7000 (kcal / h), and the exhaust temperature has reached a predetermined value, for example, 190 ° C. That is, it is a judgment for switching to semi-combustion while preventing the occurrence of scorching. Generally, garbage contains a lot of moisture, and when the cleaning of the condenser 44 is completed, the temperature difference between the inlet side temperature and the outlet side temperature is small. If the condenser 44 is closed with oil and fat, these temperature differences become large. In that case, the routine of steps S14 to S18, that is, the cleaning process is repeated. It will be.
[0033]
Steps S20 to S29 are routines for detecting that the condenser 44 is closed due to solidification of the fat and oil, and removing the fat and oil, and whether or not the condenser 44 is closed due to solidification of the fat and oil. It is also a routine for determining whether or not the state has been eliminated and whether or not the heating and drying of the garbage 2 has been completed. In this case, the entire combustion state (region) in which both the burners 20 and 21 are combusted is switched to the semi-combustion state (region) in which only the burner 20 is selectively burned to reduce the combustion amount (thermal power that does not cause scorching). Thus, if the garbage 2 is dried, it is possible to prevent scorching of the garbage 2 that has been dried.
[0034]
That is, in step S20, the burner switching valve 28 is closed, the burner 21 is extinguished, only the burner 20 is burned, and the proportional valve 24 is adjusted to set a predetermined combustion amount H5, for example, a combustion amount of 5000 (kcal / h). Adjust to. That is, the burning power is reduced and the drying process is performed with the minimum amount of heat necessary for drying. In this case, in step S <b> 21, the cooling fan 50 is stopped following the reduction in the combustion amount, and the cooling amount is reduced, thereby suppressing the solidification of the oil and fat in the steam 43.
[0035]
In step S22, it is determined again whether or not the cleaning start temperature of the condenser 44 has been reached. In this case, as the drying of the garbage 2 proceeds, the temperature difference between the inlet side temperature and the outlet side temperature of the condenser 44 increases, and the temperature difference is the same value as when the condenser 44 is blocked with oil and fat. Become. For example, it is determined whether the temperature difference between the inlet side temperature and the outlet side temperature of the condenser 44 is equal to or higher than a predetermined value, for example, 28 ° C. or higher, or whether the inlet side temperature is equal to or higher than a predetermined value, for example, 95 ° C. or higher. To do. When the cleaning start temperature is reached, the process proceeds to step S23, and all the cooling fans 50 and 52 are stopped to heat the condenser 44.
[0036]
In step S24, it is determined whether or not a predetermined time, for example, 7 minutes has elapsed since the cooling fans 50 and 52 were stopped. That is, since the heating time continues for a predetermined time, if there is a solidified oil / fat in the condenser 44, the oil / fat is dissolved, fluidized, and discharged from the steam / water separator 58 to the drain pipe 76. The
[0037]
After the predetermined time has elapsed, in step S25, the cooling fan 52 is operated to restart the cooling of the condenser 44, and the process proceeds to step S26. Step S26 is a routine for determining whether or not the solidified fats and oils have been removed from the condenser 44, or whether or not heat drying has been completed.
[0038]
In step S26, when the temperature difference between the inlet side temperature and the outlet side temperature of the condenser 44 is less than a predetermined value, for example, less than 28 ° C., the process proceeds to step S27 to determine whether or not a predetermined time has elapsed. The processes in steps S25 and S26 are continued until the predetermined time elapses. When the predetermined time elapses, the process returns to step S22, and the routines in steps S23 to S26 are repeated. That is, in step S27, it is determined whether, for example, 10 minutes have passed as the maximum time for the temperature difference to stabilize at the drying temperature, and during this time, a predetermined value, for example, 28 ° C. is used as the temperature difference indicating the cleaning start temperature. When the process does not shift to (2), drying of the garbage 2 is insufficient, so the process returns to step S22, and when the temperature difference exceeds 28 ° C., for example, the cleaning is repeated again. When the temperature difference becomes a predetermined value, for example, 28 ° C. or more in step S26, the cleaning process of the condenser 44 is removed and the process proceeds to step S28, and the cleaning process of the condenser 44 is completed.
[0039]
After this cleaning process, in step S29, it is determined whether or not the drying of the garbage 2 has been completed, that is, the temperature difference between the inlet side temperature and the outlet side temperature of the condenser 44 is a predetermined value or more, for example, 33 ° C. or more. The drying process is continued until the value shifts to a predetermined value or more. And if a temperature difference transfers to predetermined value, for example, 33 degreeC or more, it will determine with completion | finish of drying and will transfer to step S30. In step S30, the fuel main valve 22 is closed to stop the combustion of the burners 20 and 21, and the rotation of the cooling fans 50 and 52, the circulation fan 62, the deodorizing fan 80, and the stirring impeller 6 is stopped.
[0040]
The transition of the treatment temperature and the like of such garbage treatment is as shown in FIG. In FIG. 6, TA is the exhaust temperature, TB is the inlet side temperature of the condenser 44, TC is the outlet side temperature of the condenser 44, and TD is the transition of the temperature difference between the inlet side temperature and the outlet side temperature. That is, in the period th, the routine of steps S10 to S13 is repeated, and the cooling fan 50 is repeatedly stopped and driven to repeat the cooling of the condenser 44 and the heating for removing oil and fat. When this period th elapses, the outlet temperature of the condenser 44 changes between 60 ° C. and 70 ° C., for example. At this time, in the process, the process proceeds to step S14 after the determination in step S12.
[0041]
When the condenser 44 is closed, the temperature difference between the inlet side temperature and the outlet side temperature becomes large, and the temperature difference becomes ΔT. ₁ For example, at 33 ° C., time t ₁ During this period, the cooling fans 50 and 52 are stopped and the condenser 44 is shifted to the heating state. Where time t ₂ The temperature difference is ΔT before the ₁ If it does not return to, the removal of oil and fat is terminated. In the example of FIG. 6, the temperature difference ΔT ₂ Since the temperature is 10 ° C., the process in this case proceeds to step S19 after the determination in step S14. And the temperature difference ΔT ₁ Is detected again, the routine of steps S14 to S19 is repeated, and the cleaning process of the condenser 44 is executed.
[0042]
In step S19 in the flowchart (FIG. 4), when the combustion switching temperature is reached, the routine proceeds to step S20, where the combustion amount is reduced to H5, for example, 5000 kcal / h. That is, the amount of heat applied to the garbage 2 is suppressed by shifting to the semi-combustion region, extinguishing the burner 21 and burning only the burner 20. And again, the temperature difference is ΔT _Three For example, when the temperature is changed to 28 ° C., time t _Three For example, the cooling fans 50 and 52 are stopped only for 7 minutes. In steps S25 to S30, after a predetermined time, for example, 10 minutes have elapsed, the temperature difference exceeds 28 ° C., and further, the temperature difference ΔT indicating the end of drying. _Four For example, when the temperature shifts to 33 ° C., the combustion of the burners 20 and 21 is stopped, and the drying process is completed. Here, if the temperature difference does not exceed 28 ° C. within 10 minutes, it is determined that the garbage 2 in the condenser 44 has been removed, but the garbage 2 is in an undried state, and combustion is performed. Continue, again temperature difference ΔT _Three At the time of detection, the cleaning process of the condenser 44 is resumed.
[0043]
In this way, the oil-and-fat evaporation caused by the drying process of the garbage 2 and the clogged state due to the solidification of the oil-and-fat in the condenser 44 can be eliminated during the drying process, and the function deterioration of the condenser 44 is prevented. In addition, the drying process of the garbage 2 can be reliably performed, and the maintenance and cleaning process of the condenser 44 after the drying process are unnecessary, and the preparation before the drying process can be simplified.
[0044]
In this embodiment, two cooling fans 50 and 52 are installed as cooling means for the condenser 44 and are operated alternately. However, using a single cooling fan, the rotational speed is increased or decreased step by step. Alternatively, it may be stopped, or three or more cooling fans may be installed to control the number of operations.
[0045]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained.
a When the garbage is heated at high temperature, the lard and other oils and fats contained in the garbage evaporate and flow together with the steam to the condensing means. Further, it can be easily removed from the condensing means by being fluidized by softening and liquefaction, and the coagulation can be avoided and the function of the condensing means can be prevented from being lowered.
b. To provide a garbage processing apparatus in which when litter is heated at high temperature, oils and fats such as lard contained in the garbage evaporate and flow to the condensing means together with the vapor, thereby preventing deterioration of the function of the condensing means due to solidification. it can.
c When the temperature difference between the inlet side temperature and the outlet side temperature of the condensing means exceeds a predetermined value, the cooling means is stopped. Therefore, liquefaction of the oil and fat can be facilitated by controlling the internal temperature of the condensing means.
d If a fan is used as the cooling means, it is possible to easily control the cooling of the condensing means using a motor as the rotating means.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of a garbage disposal method and apparatus according to the present invention.
FIG. 2 is a block diagram showing the control device.
FIG. 3 is a flowchart showing control of garbage processing.
FIG. 4 is a flowchart showing control of garbage processing following FIG. 3;
FIG. 5 is a flowchart showing control of garbage processing following FIG. 4;
FIG. 6 is a diagram illustrating temperature control for garbage disposal.
[Explanation of symbols]
2 Garbage
4 treatment tank
20, 21 Burner (heating means)
43 Steam
44 Condenser (condensing means)
46 Outward pipe (circulation means)
48 Return pipe (circulation means)
50, 52 Cooling fan (cooling means)

Claims (4)

The garbage processing method of heating garbage in a processing tank, condensing the vapor generated from the garbage in the processing tank by a condensing means , returning it to the processing tank, and drying the garbage in the processing tank Because
Condensing the vapor by cooling the condensing means;
Monitoring the temperature of the steam passing through the condensing means;
Stopping the cooling of the condensing means when the temperature difference between the inlet side temperature and the outlet side temperature of the steam passing through the condensing means is a predetermined value or more, and heating the condensing means with the steam;
And the waste in the condensing means is softened and discharged by heating the condensing means when cooling is stopped. A treatment tank for storing garbage;
Heating means for heating the garbage in the treatment tank by combustion heat of fuel gas;
Condensing means for condensing vapor generated in the treatment tank;
Circulating means for guiding the vapor generated in the processing tank to the condensing means, condensing by the condensing means, and returning to the processing tank;
Cooling means for cooling the condensing means;
An inlet temperature detecting means for detecting an inlet temperature of the condensing means;
An outlet temperature detecting means for detecting an outlet temperature of the condensing means;
When the temperature difference between the inlet side temperature and the outlet side temperature of the condensing means reaches a predetermined temperature, by stopping the operation of the cooling means, the condensing means is heated by the steam, and fats and oils are removed from the condensing means. Control means for softening and discharging;
A garbage disposal apparatus comprising:   3. The garbage processing apparatus according to claim 2, wherein when the inlet side temperature of the condensing means exceeds a predetermined value, the cooling means is stopped.   3. The garbage processing apparatus according to claim 2, wherein the cooling means comprises a fan that supplies cooling air to the condensing means.

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