JP2007303749A - Highly water bearing waste drying apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly water bearing waste drying apparatus, drying highly water-containing waste, and drying without discharging malodor components generated in drying to the outside. <P>SOLUTION: The highly water bearing waste 10 thrown into a drying chamber 12 is heated at such a temperature to sterilize germs by a heating means 20. The drying chamber 12 and a gas-liquid mixer 36 are connected to each other, and a venturi part 34 is provided in the midway thereof. Water is injected from the venturi part 34 to the gas-air mixer 36 by a water injection nozzle 40. Thus, the malodor component generated by heating the water highly bearing waster 10 is favorably brought into contact with water in the gas-liquid mixer 36 to be adsorbed to the water. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a high water content waste drying treatment apparatus for processing high water content waste such as diapers and garbage and processing malodors generated at that time.

  Conventionally, a waste treatment apparatus generally burns waste at a high temperature of 800 ° C. or higher so as not to generate dioxins (Patent Document 1). Among the wastes, there are high-water-containing wastes containing a large amount of water such as diapers and garbage, but such high-water-containing wastes do not need to be treated at a high temperature of 800 ° C or higher. The combustion process is performed at a lower temperature. However, when high water content waste is burned, water vapor and malodorous components are generated from the high water content waste. In order to remove this malodorous component, the gas containing the malodorous component is burned (secondary combustion) at around 800 ° C.

  As another method for eliminating malodorous components generated from high water content waste such as diapers and garbage, a method is known in which high water content waste is contained in an airtight container and burned without oxygen. Patent Document 2). Generation of malodorous components can be prevented by thermally decomposing highly water-containing wastes without oxygen in a sealed container.

JP-A-11-351749 JP 2000-290660

  In the case of performing secondary combustion, there are a drawback that the fuel cost of the secondary combustion is required and a disadvantage that the volume of the secondary combustion chamber has to be increased because the volume of the steam is further expanded by heating. . In addition, when secondary combustion is performed, dioxins are generated in order to burn volatile components generated from waste, and a device for treating dioxins must be installed, which increases the manufacturing cost and running cost of the dioxin treatment device. There was a drawback. Moreover, in the technique of patent document 2, in order to accommodate a highly water-containing waste in an airtight container, there are a fault that a high water-containing waste cannot be processed in large quantities, and a fault that a manufacturing cost and a running cost become high. there were.

  The present invention has been made in view of the above points, and it is possible to dry a high water content waste, and to dry the high water content waste that can be processed without discharging malodorous components generated during the drying to the outside. The object is to provide a processing apparatus.

A highly water-containing waste drying treatment apparatus according to the present invention heats a highly water-containing waste at a temperature for sterilizing bacteria contained in the water-containing waste contained in the drying chamber containing the water-containing waste. Heating means, a gas-liquid mixer communicating with the drying chamber, a venturi section provided between the drying chamber and the gas-liquid mixer, and a venturi section or provided upstream in the vicinity of the venturi section And a water injection nozzle that injects water from the venturi portion toward the gas-liquid mixer side. The present invention is provided with a spiral cutting blade for cutting the highly water-containing waste in the drying chamber so that the cutting blade can rotate freely, and the cutting blade has a partial angle in a circumferential direction of 360 degrees viewed from the axial direction. This is characterized in that a notch is provided in the outer edge of the. The present invention is characterized in that the positions of the notches viewed from the axial direction in the circumferential direction of 360 degrees adjacent to each other of the spiral cutting blades are different from each other. The present invention includes a buffer tank for reducing pressure fluctuation between the drying chamber and the gas-liquid mixer. The present invention includes a water storage tank that communicates with the gas-liquid mixer, connects the water storage tank and the water injection nozzle through a water circulation passage, includes a pump in the middle of the water circulation passage, and operates the pump. Water in the water storage tank is jetted from the water jet nozzle through the water circulation passage.

  The present invention injects water injected from a water injection nozzle toward a venturi portion having a small cross-sectional area in a space where gas (water vapor and malodorous components) generated by heating high water content waste is present. . A negative pressure is generated by this water injection, and a gas in which water vapor and malodorous components are mixed by the negative pressure is introduced into the gas-liquid mixer at a high speed. By introducing gas and water into the gas-liquid mixer at high speed, the contact ratio between the malodorous component and water can be increased, and the malodorous component can be adsorbed to water, and the malodorous component can be removed.

  The present invention heats a highly water-containing waste at about 180 ° C., which sterilizes bacteria contained therein, and does not burn the waste. For this reason, dioxins are not generated in the present invention. Therefore, since the dioxin countermeasure is unnecessary, the cost of the apparatus can be kept low.

  In the present invention, by providing a notch at a part of an angle of 360 ° C. viewed from the axial direction of the cutting blade, the rubber string or the like contained in the high water content waste is not caught on the cutting blade, and the rubber string or the like is cut. It is possible to prevent a large torque from being applied to the driving means by being caught by the blade.

  In the present invention, before the gas from the drying chamber is introduced into the gas-liquid mixer, it is once introduced into a buffer tank having a larger cross-sectional area than the gas-liquid mixer, so that the pressure fluctuation due to water vapor generated by the heating of the high water content waste Can be adsorbed by a buffer tank. As a result, it is possible to stabilize the control of the apparatus while keeping the pressure fluctuation constant. Further, the present invention only heats the waste (heated at about 180 ° C.), and does not burn it (burns at about 800 ° C.). For this reason, in the present invention, the expansion rate of water vapor is smaller than that of the combusted material, the volume of the buffer tank can be reduced, and the apparatus can be miniaturized.

  In the present invention, of the water that has passed through the gas-liquid mixer, clean water can be injected from the water injection nozzle through the water circulation passage, so that effective use of water can be achieved.

Next, the present invention will be described based on the drawings.
FIG. 1 is a schematic configuration diagram of a high water content waste treatment apparatus according to the present invention. The to-be-processed object processed with the high water content waste drying processing apparatus of this invention is the high water content waste 10 containing many water | moisture contents, such as a diaper and garbage. The highly water-containing waste drying treatment apparatus of the present invention has a main body 14 in which a drying chamber 12 for housing a high water-containing waste 10 is formed. The main body 14 is provided with an inlet 16 for the highly water-containing waste 10 and a discharge outlet 18 for the waste after drying. Adjacent to the main body 14, a heating means 20 for heating the highly water-containing waste 10 put in the drying chamber 12 is provided. The heating means 20 is for heating the high water content waste 10 accommodated in the drying chamber 12 and does not burn the high water content waste 10. The temperature at which the highly water-containing waste 10 is heated by the heating means 20 is set to exceed the temperature (about 180 ° C.) for sterilizing various bacteria contained in the high-water content waste 10. If the heating means 20 is about 200 ° C., for example, the highly water-containing waste 10 in the drying chamber 12 has a temperature at which various bacteria are sterilized.

  A cutting blade 22 is rotatably provided inside the drying chamber 12. The cutting blade 22 cuts the highly water-containing waste 10 put into the drying chamber 12 finely. For example, the cutting blade 22 is preferably formed in a spiral shape around the rotation shaft 24. By making the cutting blade 22 spiral, the highly water-containing waste 10 can be smoothly moved in the drying chamber 12. One end of the rotating shaft 24 protrudes to the outside of the main body 14, and a motor 26 as a driving means is attached to the protruding portion. By driving the motor 26, the spiral cutting blade 22 is rotated, and the highly water-containing waste 10 is cut and moved.

  The cutting blade 22 is desirably set so as to provide a notch 28 on the outer edge of a part of the angle (for example, 60 degrees to 150 degrees) in the circumferential direction of 360 degrees when viewed from the axial direction of the rotating shaft 24. Both the radial edge and arc edge of the notch 28 form a blade. In the circumferential direction of the first 360-degree cutting blade 22 in the axial direction of the rotary shaft 24, the next 360-degree cutting blade 22, and the adjacent cutting blades 22 at every 360 degrees thereafter, viewed from the axial direction. The positions of the notches 28 are set so as to be formed at different positions. When the cutting blade is a jagged blade formed at a uniform interval in the circumferential direction, there is a problem that a large torque is applied to the motor 26 due to a rubber string or the like being caught by the blade. On the other hand, by providing the notch 28 at the circumferential position of the outer edge of the cutting blade 22 and providing the notch 28 at a position shifted from the axial direction, the highly water-containing waste 10 is applied to the cutting blade 22. The high moisture content waste 10 can be cut smoothly, and the problem that a large torque is applied to the motor 26 can be solved.

  A buffer tank 30 is provided in the vicinity of the main body 14, and the buffer tank 30 and the drying chamber 12 of the main body 14 are connected by an exhaust pipe 32. The buffer tank 30 is for temporarily storing exhaust gas introduced from the drying chamber 12 through the exhaust pipe 32. The bottom of the buffer tank 30 is a venturi section 34, a gas-liquid mixer 36 is provided below the venturi section 34, and a water storage tank 38 is provided below the gas-liquid mixer 36. The venturi section 34 may be formed in a passage between the buffer tank 30 and the gas-liquid mixer 36. The gas-liquid mixer 36 is used for efficiently mixing gas and liquid therein. A water injection nozzle 40 is provided in the buffer tank 30, and water from the water injection nozzle 40 is injected into the venturi section 34, and water from the water injection nozzle 40 is injected into the water through the gas-liquid mixer 36 from the venturi section 34. It is moved toward the nozzle 40. In order to inject water from the water injection nozzle 40 toward the venturi part 34 having a small cross-sectional area from a position having a large cross-sectional area, the water injection nozzle 40 is provided at the venturi part 34 or an upstream position near the venturi part 34.

  A lower portion of the water storage tank 38 and the water injection nozzle 40 are connected by a water circulation passage 42. A pump 44 is provided in the middle of the water circulation passage 42, and clean water (water that does not adsorb malodorous components) in the water storage tank 38 is injected from the water injection nozzle 40 through the water circulation passage 42 by the operation of the pump 44. Is done. A water supply passage 46 is connected to the upper portion of the water storage tank 38, and fresh water is supplied into the water storage tank 38 from the water supply passage 46 as necessary. A drainage passage 48 is connected to a position slightly above the side surface of the water storage tank 38, and water having adsorbed malodorous components with water inside the water storage tank 38 is discharged to the outside due to overflow. The upper part of the water storage tank 38 is connected to an air communication passage 50 that connects the upper part of the water storage tank 38 and the outside air. A pressure release valve 52 is provided in the middle of the air communication passage 50 to release the pressure when the air pressure in the water storage tank 38 exceeds a predetermined level.

  Next, the function of the high water content waste drying apparatus of the present invention will be described. The high water content waste 10 is put into the drying chamber 12 in the main body 14, and the high water content waste 10 accommodated in the drying chamber 12 is heated by the heating means 20 at a temperature at which bacteria are sterilized. That is, in the present invention, the high water content waste 10 is not burned. When heating by the heating means 20, the motor 26 is driven to rotate the rotating shaft 24, whereby the high water content waste 10 is finely cut by the spiral cutting blade 22 and also cut in the drying chamber 12. The high water content waste 10 can be moved. By cutting the high water content waste 10 finely and moving the cut high water content waste 10, the heat from the heating means 20 can be efficiently transmitted to the cut high water content waste 10, and the fuel cost can be reduced. Can be reduced. In addition, by providing the cutting blade 22 with the notch 28, it is possible to prevent the rubber string or the like contained in the highly water-containing waste 10 from being caught and to prevent the motor 26 from being subjected to high torque.

  For example, water and malodorous components are generated from the highly water-containing waste 10 heated to 200 ° C. in the drying chamber 12. The water vapor and malodorous components are introduced into the buffer tank 30 from the drying chamber 12 through the exhaust pipe 32. The amount of gas (water vapor and malodorous component) generated in the drying chamber 12 and the gas pressure vary greatly depending on the amount of moisture contained in the highly water-containing waste 10. For this reason, the pressure of the gas from the drying chamber 12 having a large cross-sectional area to the exhaust pipe 32 having a small cross-sectional area varies, making it difficult to control the amount of water injected from the water injection nozzle. In the present invention, the gas passing through the exhaust pipe 32 is once accommodated in the large-capacity buffer tank 30, and the fluctuation of the gas pressure in the buffer tank 30 is eliminated, thereby controlling the injection amount of water from the water injection nozzle. It can be stabilized.

  By the operation of the pump 44, water is jetted from the water jet nozzle 40 provided in the buffer tank 30 toward the venturi unit 34. The jet of water toward the venturi section 34 generates a negative pressure in the venturi section 34, and the gas (water vapor and malodorous component) in the buffer tank 30 and the water from the water jet nozzle 40 are fast due to the negative pressure. It is introduced into the gas-liquid mixer 36 at a speed. In the gas-liquid mixer 36, the malodorous component is efficiently stirred and mixed with water, and the malodorous component is adsorbed by the water.

  The water that has adsorbed malodorous components by the gas-liquid mixer 36 is stored in a water storage tank 38 positioned below the gas-liquid mixer 36. Water adsorbing malodorous components is located in the upper part of the water storage tank 38, but clean water not adsorbing malodorous components is located in the lower part of the water accommodation tank 38, and clean water passes through the water circulation passage 42 by the pump 44. From the water injection nozzle 40. The water adsorbing malodorous components located in the upper part of the water storage tank 38 is discharged from the drainage passage 48 to the outside due to overflow. If necessary, fresh water is introduced into the water storage tank 38 from the water supply passage 46. When the atmospheric pressure in the water storage tank 38 becomes higher than a predetermined level, the pressure release valve 52 is opened to release the pressure in the water storage tank 38 from the atmosphere communication passage 50 to the atmosphere.

  The high water content waste 10 heated at a temperature for sterilizing bacteria in the drying chamber 12 is discharged from the discharge port 18 as waste dried in a sterilized state. The dried waste can be disposed of as harmless and can be used as fuel or aggregate.

It is a schematic block diagram of the high water content waste drying processing apparatus which concerns on this invention. It is a fragmentary perspective view of the cutting blade used with the high water content waste drying processing apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 High water content waste 12 Drying room 20 Heating means 22 Cutting blade 26 Motor 28 Notch 30 Buffer tank 34 Venturi part 36 Gas-liquid mixer 38 Water storage tank 40 Water injection nozzle 42 Water circulation path 44 Pump

Claims (5)

A drying chamber for storing the highly water-containing waste, a heating means for heating the high-water-containing waste at a temperature for sterilizing bacteria contained in the highly water-containing waste stored in the drying chamber, and the drying chamber A gas-liquid mixer, a venturi section provided between the drying chamber and the gas-liquid mixer, and a venturi section or an upstream in the vicinity of the venturi section, and water is mixed from the venturi section into the gas-liquid mixture. A water-containing waste drying treatment apparatus, comprising: a water injection nozzle that injects toward a container side. A spiral cutting blade for cutting the highly water-containing waste is rotatably provided in the drying chamber, and the cutting blade is notched at an outer edge of a part of the angle in a circumferential direction of 360 degrees viewed from the axial direction. The high water-containing waste drying treatment apparatus according to claim 1, wherein: The highly water-containing waste drying treatment apparatus according to claim 2, wherein the positions of the notches viewed from the axial direction in the circumferential direction of 360 degrees adjacent to each other of the spiral cutting blades are different from each other. The high water-containing waste drying treatment apparatus according to claim 1, further comprising a buffer tank for reducing pressure fluctuation between the drying chamber and the gas-liquid mixer. A water storage tank in communication with the gas-liquid mixer; the water storage tank and the water injection nozzle are connected in a water circulation passage; a pump is provided in the middle of the water circulation passage; and the water storage tank is operated by operating the pump. The water-containing waste drying treatment apparatus according to claim 1, wherein water in the inside is jetted from the water jet nozzle through the water circulation passage.

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