JPH11315283A - Method for drying and carbonizing water-containing organic waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method whereby water-contg. org. wastes, esp. litter from cowsheds or stables, chicken droppings, rice husks, coffee bean cake, soy bean cake, vegetable scrap and other garbage, mowed lawn of golf links, etc., are treated hygienically at a low cost. SOLUTION: Externally heated drying and carbonizing ovens 2a,...2d are formed by connecting a plurality of externally heated circular cylinders, each having a stirring and conveying member installed therein, in series via connecting passages each having an opening-closing apparatus V. A water-contg. org. waste is supplied through a supply port 2e installed at the one end of the first one (a drying oven) of the circular cylinders, is thermally dried while being conveyed under stirring to the other end, and is supplied to the following heated cylinders (carbonizing ovens) wherein to be thermally carbonized. Then, the resultant carbonization product is separated. Carbonization is thus carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to drying and carbonizing organic exhaust containing water, and more particularly to bedding and stable litter, poultry manure, rice husk, coffee beans and soybean slag, and vegetables. The present invention relates to a method of drying and carbonizing suitable for treating refuse and other kitchen garbage, and cut grass at a golf course.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No. Sho 50-130803 discloses a method of incinerating vegetable waste, such as vegetable and vegetation waste, as a conventional method of incinerating vegetable waste. In this method, a combustion chamber and a carbonization chamber are provided separately, and pieces of wood and the like that are easy to burn are put into the combustion chamber, and the heat of the combustion is used to carbonize vegetables and plant waste in the carbonization chamber. It may be bad and may give off odor. Also described in Japanese Patent Application Laid-Open No. 52-21167, after coarsely crushing and foreign matter separation of kitchen garbage and weeds, and then granulating the first-dried one after pulverizing with a juicer or a grinding machine,
There is a method of secondary drying this and separating the generated gas, then processing it into organic fertilizer or feed, but it requires a lot of time for processing, and it is not so much for drying cut grass and rice husk and carbonizing. Not suitable.

[0003] In order to apply these conventional techniques to bedding used in cowsheds or stables, rice husks after threshing, cut grass containing sand, etc., the water content is too high or the flame retardant. It cannot be treated as expected due to its nature, and if it is dried on a fire, it will rot and give off a bad smell. In particular, grass cut off at golf courses contains not only lawns and weeds, but also a considerable amount of sand. Therefore, if the raw material was treated using a conventional incinerator, it could not be completely burned, and it was difficult to perform carbonization.

[0004] As a carbonization treatment of moist organic matter including mowing turf and rice husk, as shown in FIG. 2, a heat radiation source having a burner on the ceiling surface has been known. A pair of paddles 2a for transporting the cut grass while stirring the cut grass are disposed in the cylindrical drying furnace 2 having a furnace 6a and keeping the inside of the furnace in an oxygen-deficient state. An input port 5 for charging mowing turf and an exhaust port 4 for discharging moisture evaporated from the turf are provided at one end of the drying furnace 2 and are higher than the drying furnace 2 through an overflow chute provided at the tip. A carbonizing furnace 3 is connected to an end of a carbonizing furnace having a heat radiation source for maintaining a temperature on a ceiling surface, and turf dried in the drying furnace 2 is supplied into the carbonizing furnace 3 and stirred and transferred by a pair of paddles 3a. Opposite to the chute after carbonizing In which the on-off valve V provided in the discharge port 7 formed in the end it was taken out of the peat moss.
(See JP-A-6-122879)

However, in the above-mentioned invention, since the drying furnace and the carbonizing furnace are of a direct heating type in which a burner as a heat radiation source is provided on the ceiling surface, the temperature and the amount of oxygen in each of the furnaces are optimized. With the difficulty of controlling the temperature range,
In addition, cut grass on a golf course is used to cut the extended turf and then flatten it by putting sand in the hollow of the lawn in order to eliminate damaged parts such as unevenness on the lawn. It is necessary to separate and recycle the carbide and the sand because of containing sand, but no consideration has been given to this point.

Therefore, as a result of intensive studies for improving these prior arts, the applicant has recently filed Japanese Patent Application No. 6-24.
As described in US Pat. No. 4,679, an external heat type carbonization apparatus suitable for treating cut grass containing sand is proposed.
According to the present invention, as shown in FIG. 3, a cylindrical heating inner cylinder 4b provided with a screw conveyor 4g or a spiral groove therein and a heating path provided to surround the inner cylinder to form an outer jacket 4c. The external heating type carbonization furnace 4 is constructed by heating the inner cylinder part from the outside to indirectly dry and carbonize, and receives the cut grass mixed with sand at one end of the inner heating cylinder. Hopper 2 and a screw feeder 2a at the lower part of the hopper, and a cooling separation tower 6 for cooling and separating carbonized products and sand of the turf treated in the carbonization furnace at the other end. A hot air generating furnace 5 for supplying hot air is connected to a jacket of the processing furnace to perform carbonization. However, in order to perform processing using the present invention, since the firing furnace is constituted by one heating cylinder, the amount of firing processing is limited and large-scale processing is difficult, and an attempt is made to increase the amount of processing per hour. If you do, you can make the heating cylinder a large diameter, or
It is necessary to make the device long, and in such a case, the device becomes large, and there is a problem that a large installation space is required, fuel and other maintenance costs are required.

[0007]

The lawn of a golf course or the like is cut by a machine, so that the sand is sucked and collected together with the cut grass, so that the grass containing a large amount of sand is dried. Therefore, there is a need for a processing method capable of efficiently performing the processing using an appropriate means, since the carbonization efficiency may be impaired. Also, the sand collected with the turf
Although weed seeds and fungus and larvae of pests are mixed in, sand used in golf courses etc. is high quality and expensive, so to collect and reuse it, these pests can be completely removed and reusable It is desired to obtain natural sand at low cost, and to separate the char obtained by carbonizing the cut turf from sand, and then treat it so that it can be used as lawn and other soil improving materials.

[0008]

SUMMARY OF THE INVENTION In order to dry and carbonize cut grass and other water-containing organic wastes using an externally heated heat treatment furnace, the treatment furnace has a short interior. The heating cylinder portion is configured to be small in size from a heating cylinder portion and a jacket portion forming a heating furnace, and the heating cylinder portion is provided with an agitating and transferring member such as a screw conveyor and internally rotatably supporting both ends of a rotating shaft. A plurality of cylindrical bodies are arranged side by side in a multi-stage shape, and the ends of the cylindrical bodies are connected via a communication path that can be opened and closed on the way to form a heating cylindrical portion. After forming a multi-stage heat treatment section in which a hot air passage for heating is continuously formed, and after drying the water-containing organic waste charged from the hopper section provided at one end of the upper cylindrical body in the upper drying path, The carbonized product and the non-combustible material such as sand that have been treated in the carbonization furnace Cooling and separating by the cooling and separating unit provided at the end of the gasification furnace, supply the carbonized products to the hot air generator provided near the lower carbonization furnace, and generate the hot air in the processing furnace. To dry and carbonize the water-containing organic waste.

[0009]

FIG. 1 is a schematic view showing an embodiment of the present invention, in which a screw feeder 7 is provided below a funnel-shaped hopper 7 for receiving cut grass.
a, the tip opening of the screw feeder is connected to an inlet 2e for supplying turf to the heating cylinder 2 of the carbonization furnace 1, and the carbonization furnace 1 is provided with a screw conveyor 3 inside. A heating inner cylinder part 2 is formed by connecting a plurality of cylindrical heating cylinders which support both ends in a horizontal position, and a jacket part 3 is formed so as to surround the cylinder part. A partition wall 3e is provided between the inner cylinder 2 and a hot air path 3a. . . 3
d is formed, and the heating cylinder has a carbonization treatment zone 2c, 2d maintained at a high temperature near a hot blast stove and kept in an oxygen-deficient state, and a drying treatment zone 2a, 2b maintained at a relatively low temperature close to an exhaust port. The hot air path 3d is provided with a hot air supply port connected to a hot air jet port 5c of the hot air generating furnace 5 and an exhaust port 3f connected to a smoke exhaust device 8 such as a chimney. Make up the device.

A cooling / separating device 9 for cooling and separating the carbonized product through a rotary valve V is provided at a discharge port 2f provided in the lower cylinder of the carbonization furnace 1. Further, at each end of the heating inner cylinder 2, an exhaust port for exhausting gas generated in the drying and carbonizing treatment zone and an exhaust duct 6 are provided, and the duct 6 is provided with a regulating valve 6b. The exhaust duct is connected to the smoke exhaust device 8 and the hot-air generating furnace 5 so as to be freely switchable.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the above embodiments. Raw turf containing water mowing and collected by a lawn mower is put into a hopper 7 together with sand, scraped out by a screw feeder 7a provided at a lower part of the hopper, and provided in a heating cylinder 2 of a carbonization furnace 1. Is supplied to the supply port 2e. On the other hand, the heating inner cylinder 2 is provided with a hot air supply port 5 c of the hot air generating furnace 5.
Is heated from the outside by the high-temperature hot air supplied to the hot air passage 3d at the lower part of the processing furnace, and the inside cut grass is indirectly heated. At this time, since the hot air is in a countercurrent to the moving direction of the turf in the heating cylinder, the lower heating cylinders 2c and 2d are heated to a high temperature, but the upper heating cylinders 2a and 2b are cooled. Since it is heated to a slightly lower temperature, the upper heating inner cylinder 2
The portions a and 2b are in a temperature range suitable for the drying process, and the lower heating inner cylinders 2c and 2d are maintained in a temperature range suitable for the carbonizing process.

Accordingly, the raw grass put into the heating cylinder 2a in the drying zone is transported while the screw conveyor 4 provided in the heating inner cylinder 2 is rotated by the motor M and the transmission 4a while being stirred. , 2b are dried by heating. Next, the turf and sand dried in the drying treatment zone are sent to the carbonization treatment zone, where they are carbonized in a steamed state while being stirred and transferred inside the heating cylinders 2c and 2d to the discharge port 2f, and the carbonized product is discharged. The rotary valve at the outlet is opened and sent to the cooling / separating device 9 to remove the heat.
Separated into carbide and sand by other well-known separation means, the sand is discharged to an outlet 9a, and the carbide is discharged to an outlet 9b from an outlet provided at a lower portion of the cooling separation section, and is collected and reused. Will be.

At this time, by opening a shutter provided in the carbide separation path as needed, the carbide is sent from the supply port 5b of the hot blast stove to the combustion chamber and can be used as fuel. Further, by operating each regulating valve 6b in accordance with the water content and the sand content of the object to be treated, the steam and carbon dioxide gas and other conditions in the heating cylinder 2 are adjusted to optimize the inside of the heating cylinder. The gas generated in the heating cylinder 2 during the heat treatment of the turf may be exhausted through the exhaust duct 6, but in the case of a bad smell, the valve of the duct 6 may be exhausted. By switching and operating the fan 6a and sending it to the hot-air generating furnace 5, it is burned and decomposed together with the fuel in the furnace and becomes hot air and sent to the heating path 3d.
It can be sent to a smoke exhaust device 8 such as a chimney, and be released into the atmosphere as a colorless, odorless and harmless gas.

In the above invention, the screw conveyor 4
The present invention can be used as a drying apparatus by increasing the number of revolutions and shortening the residence time of the object in each heating cylinder 2 so that the object is not carbonized. Further, by adjusting the temperature of the hot air generating furnace 5 to keep the temperature of the lower heating inner cylinders 2c and 2d lower than the carbonization temperature, it is possible to use the drying apparatus as an efficient drying apparatus. Also, in place of the above-described heating cylinder, a known kiln furnace having a spiral groove formed on the inner peripheral surface of a rotatable cylinder can be used to perform the same drying and carbonization treatment. Needless to say, a combination of a screw conveyor type and a kiln type may be used.
In the carbonization apparatus having the above-described configuration, the screw conveyor 4 provided in the heating cylinder 2 of the carbonization furnace 1 is used.
Is a single-shaft type, but the present invention is not limited to this type. In consideration of the capacity of the hot-air generating furnace 5, the stirring efficiency of the heating cylinder 2, and the like, a multi-screw conveyor having two or more shafts is provided. Needless to say, a shaft type may be used, and a paddle conveyor may be used instead of the screw conveyor.

[0015]

According to the invention of the present application, the following effects can be obtained by employing the above-described configuration. The combustion furnace body is composed of an inner cylinder for heating and an outer jacket surrounding it, and the raw grass and the like are heated and baked while being stirred while being transferred in the heating cylinder. It is possible to select and change the heating time, the heating temperature, and the calcination conditions in accordance with the flammability and the flammability so that an optimum product can be obtained. Then, when burning raw grass containing a large amount of sand, the heated sand acts as a heating medium, and the turf to be baked is mixed and stirred with the sand, so that the turf is heated and ignited. It is possible to carbonize without having to, it is possible to obtain the most suitable as a supplementary soil and soil improvement material for golf courses, and when it is not necessary to reuse carbide,
It is possible to continuously burn directly as fuel. Further, by adjusting and controlling the feed speed of the screw conveyor, the amount of water vapor in the heating cylinder, the temperature of the hot-air generating furnace, and the like, it becomes possible to use not only a carbonization treatment device but also a drying device. In addition, since the heating cylinder is made shorter than the conventional one and is connected by being stacked in multiple stages to form a heating furnace, the apparatus main body can be made compact.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing the entire apparatus of the present invention.

FIG. 2 is a schematic sectional view of a conventional example.

FIG. 3 is a schematic sectional view showing a prior art example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Carbonization processing furnace 2 Heating inner cylinder 2a Drying processing zone 2c Carbonization processing zone 3 Mantle part of carbonization processing furnace 4 Transport screw 5 Hot air generating furnace 6 Exhaust duct 7 Supply hopper 8 Smoke exhaust device

Claims (2)

[Claims] 1. A stirrer and transfer member are provided inside,
Supplying organic waste containing water at one end of the upper part of the cylindrical body to an externally-heated carbonization furnace in which a plurality of cylindrical bodies to be heated outside are connected in a horizontal multi-stage shape. While being supplied from the mouth, while being transferred to the discharge port at the other end while being agitated by the transfer member, heating and drying are performed in the heating cylinder of the preceding stage, and then heating and carbonizing are performed in the heating cylinder of the subsequent stage. A method for drying and carbonizing hydrated organic waste. 2. A cut grass containing sand as the waste containing water is supplied from a supply port, and a calcined product treated in a carbonization furnace is converted into a carbonized material and sand by a cooling separation device provided at a discharge port. 2. The method according to claim 1, wherein the liquid is collected separately.
The method for drying and carbonizing the water-containing organic waste described in the above.