JP2004108727A - Waste drying system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently dry waste such as food waste, by using exhaust heat of a motor. <P>SOLUTION: The waste is dried by conveying hot water heated by the exhaust heat of an engine of a diesel engine generator A to a hot water dryer 1 having a double drying structure of an outer cylinder and an inner cylinder and to stir and mix the waste from the diesel engine generator A by a water feed pump B. The feed hot water is lowered in temperature, exhausted and returned as cooling water to the diesel engine generator A in a circulating state through a conduit C. Steam of the hot water dryer 1 is exhausted by a vacuum pump E. A condenser D to condense the steam in an exhaust process is provided. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a system for drying waste, especially food waste such as garbage. More specifically, a system for drying food waste and the like using exhaust heat of a prime mover used for power generation and the like, particularly a system suitable for drying food garbage discharged from small and medium-sized stores and the like. About.
[0002]
[Prior art]
A large amount of food waste is discharged daily from small and medium-sized stores such as small and medium-sized retail stores, supermarkets, fast food restaurants, restaurants, and canteens. Most of this food waste is disposed of as waste. However, there has recently been an increasing number of attempts to use this garbage effectively. Related processing methods and processing systems have been developed.
[0003]
However, it is often used as a relatively large system, and in particular there are many cases where the system is installed exclusively in a large food factory or the like, and there are few cases where the system is installed at a small or medium scale. In addition, many kitchen garbage devices for home use have been developed, and kitchen garbage is reduced to compost or the like. Various small-scale garbage disposal apparatuses have been developed and proposed.
[0004]
In addition, in small and medium-sized retail stores, supermarkets, and the like, private power generation is often performed, and power generation by a diesel engine is particularly popular as a prime mover. This in-house power generation is effective in adjusting the power consumption during operation hours and the like and reducing the cost of the power rate. When the amount of power generation changes, the amount of heat exhausted changes accordingly, but if the amount of power generation is constant, the amount of heat exhausted is constant. In recent years, research has been made to effectively use the exhaust heat of a prime mover as a cogeneration system, and a proposal has been made (for example, see Patent Document 1).
[0005]
[Patent Document 1]
JP 2001-321740 A
[Problems to be solved by the invention]
However, as described above, a consistent and effective utilization method of the cogeneration system has been proposed, but no specific proposal has been made yet for a method for keeping the energy efficiency high. Although various proposals have been made for a method of treating garbage as described above, at present it is not yet a simple and efficient method or system. A cogeneration system is a system that uses two or more effective energies such as heat together with electricity from one energy source. Since the total thermal efficiency is over 80%, it is expected for users who need electricity and heat simultaneously. Is a field that is
[0007]
For example, by using a heat medium such as an air conditioner for cooling and heating, hot water supply, steam, hot air, hot air or the like, it effectively functions to save energy and reduce costs. It is attracting attention from the viewpoint of saving energy resources and preserving the global environment. Garbage disposal is no exception. The problem depends on the function of the dryer using waste heat. However, as for the garbage dryer, as described above, an efficient one has not yet been developed.
[0008]
As described above, when performing in-house power generation, a certain amount of waste heat may be generated by management. If this is used effectively, a very effective system is possible. In addition, garbage is constantly generated every day during opening. If the above-mentioned constant waste heat is utilized and applied to an efficient dryer, a waste drying system with no waste can be realized. The present invention has been made based on such a technical background, and is a result of reconsidering the conventional method and conducting repeated studies, and achieves the following objects.
[0009]
An object of the present invention is to provide a waste drying system that utilizes hot water generated by exhaust heat of a prime mover and is applied to a dryer having a double-tube drying configuration of an outer cylinder and an inner cylinder to improve drying efficiency and improve processing capacity. It is in.
Another object of the present invention is to provide a waste drying system that can be reduced in size by adopting a double tube configuration.
Still another object of the present invention is to provide a waste drying system that can effectively utilize a heat source without wasting.
Still another object of the present invention is to provide a waste drying system that enables recycling of fertilizer and the like without discarding food waste and the like.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the waste drying system of the present invention employs the following means. That is, the waste drying system according to the first aspect of the present invention provides a waste drying system in which the cooling water of a prime mover that generates power uses hot water heated by waste heat to dry waste. A hot water dryer having a drying structure, receiving the supply of the hot water, stirring and mixing the waste, and drying; a vacuum pump for keeping the inside of the hot water dryer at a pressure lower than the atmospheric pressure; And a pipeline that circulates between the hot water dryer and the prime mover, wherein the waste is dried using waste heat of the prime mover.
[0011]
In the waste drying system according to a second aspect of the present invention, in the first aspect, the hot water dryer may be a batch type dryer. Food waste can be surely dried every fixed amount.
[0012]
In the waste drying system according to a third aspect of the present invention, in the first aspect, the prime mover may be a diesel engine. Easy system maintenance and low cost.
[0013]
The waste drying system according to a fourth aspect of the present invention, in the first aspect, may further include a condenser for condensing steam generated in the hot water dryer. It can condense to remove water and release only air to the outside.
[0014]
In a waste drying system according to a fifth aspect of the present invention, in the first aspect, the hot water dryer may be mixed with media so that the media circulates together with the waste. It is effective to increase the drying efficiency of the system.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram of the waste drying system of the present invention. The heating medium of the waste drying system is hot water. This hot water is obtained by heating the cooling water of a diesel engine that generates electric power and becomes hot water. The diesel engine generator A is a combination of a diesel engine and a generator, and is used as a private generator. This is one of the cogeneration systems because it uses power generation and waste heat. Diesel engines are widely used and have value in terms of thermal efficiency, operating costs and maintenance.
[0016]
The hot water is sent to the hot water dryer 1 by the water pump B at a temperature of about 80 ° C. The power of the water pump B is supplied by the diesel engine generator A. The hot water dryer 1 which is a main part of the present invention utilizes cooling water for power generation by a diesel engine which is heated by exhaust heat to become hot water. The waste to be dried by the hot water dryer 1 is food waste such as raw food. Food wastes contain a lot of water and are easily perishable, so it is necessary to process them quickly. Therefore, it is desirable that the system according to the present invention be installed in a store such as a supermarket to be used.
[0017]
The hot water dryer 1 is of a batch type in which a fixed amount of a dry material is dried for a fixed time. Hereinafter, in the embodiments of the present invention, waste will be described as a dry raw material. The basic configuration of the hot water dryer 1 is cylindrical, and has a double structure of an outer cylinder and an inner cylinder. As described above, the heat source for drying utilizes hot water heated to about 80 ° C.
[0018]
Next, the main body configuration of the hot water dryer 1 will be described in detail. An outer cylinder 3 is fixed to a base 2 having a frame structure. Since the fixing between the base 2 and the outer cylinder 3 is performed by the bolts / nuts 4, the outer cylinder 3 can be attached to and detached from the base 2. The tubular body of the outer tubular body 3 constitutes an outer tubular hot water jacket 5, and in the figure, a portion through which warm water passes is indicated by oblique lines for easy understanding.
[0019]
The hot water is separately supplied to each of the hot water jackets, and is passed into the outer cylindrical body 3 from the hot water inlet 6 of the outer cylindrical body 3 by the water supply pump B via the pipe C1 to the outer cylindrical body 3. Is discharged from a warm water outlet 7 provided at one end of the outer cylinder 3. At this time, the hot water loses heat and is in a state of low temperature water. The discharged water is returned to the diesel engine generator A via the pipe C2, and is used again as cooling water. The hot water of the hot water dryer 1 passes through the entire cylindrical body and heats the entire cylindrical body, so that heat is applied regardless of the position of the dry material.
[0020]
On the other hand, a dry raw material inlet 8 is provided above the outer cylindrical body 3 to supply a fixed amount of dry raw material. The supplied dry raw material is measured by a measuring device (not shown). This dry raw material is mainly intended for food waste as described above. A dried material outlet 9 is provided at a lower portion of the outer cylinder 3, and the supplied dry raw material is dried and discharged from the dried material outlet 9 as a dried material.
[0021]
At the center of the outer cylinder 3, an inner cylinder 10 is rotatably provided. Both ends of the inner cylinder 10 are supported via bearings 11 at the ends of the outer cylinder 3. A sprocket 12 as a rotation transmitting member is attached to one end of the inner cylindrical body 10. On the other hand, a drive motor 13 is fixed on the base 2, a sprocket 14 is provided at the shaft end, and a chain 15 is wound around the sprocket 12 of the inner cylinder 10. The inner cylindrical body 10 is rotationally driven by the drive motor 13 via a chain 15.
[0022]
Further, the cylindrical portion of the inner cylindrical body 10 constitutes an inner cylindrical warm water jacket 16, and the hot water flows from a warm water inlet 17 provided at an end of the inner cylindrical body 10 to the inner cylindrical warm water jacket 16 via a conduit C <b> 3. It is passed through. As in the case of the outer cylinder 3 described above, the inner cylinder 10 is also in a state where the entire cylinder is heated, so that heat is applied regardless of the position of the dry raw material.
[0023]
The hot water passed through passes through the inner cylinder hot water jacket 16 and is discharged to the outside from a hot water outlet 18 provided at the other end of the inner cylinder body 10. At this time, the hot water loses heat and becomes water whose temperature has decreased. The discharged water is integrated with the water discharged from the outer cylinder warm water jacket 5 into a single conduit and returns to the diesel engine generator A, and, similarly to the case of the outer cylinder described above, the engine of the diesel engine generator A Used again as cooling water.
[0024]
This water is sent to the diesel engine via the pipe C4 and becomes cooling water. This cooling water is heated again to become hot water, and is used while circulating. Therefore, there is no need for a conventional cooling tower or the like. A stirring blade 19 is provided on an outer portion of the inner cylinder 10. A plurality of the stirring blades 19 are provided near the inner wall of the outer cylinder 3. The stirring blade 19 rotates together with the inner cylinder 10 with the rotation of the inner cylinder 10 and relatively rotates with the inner wall of the outer cylinder 3.
[0025]
The dry raw material moves in the rotation axis direction while following this rotation. An intake port 21 having a scraping blade 20 is provided at an end of the inner cylindrical body 10. The dried raw material brought down in the outer cylinder 3 is scraped up by the scraper blades 20, and is taken into the inner cylinder 10 from the intake 21. On the other hand, a spiral ribbon 22 is provided inside the inner cylindrical body 10.
[0026]
The taken dry raw material is moved in the direction of the rotation axis along the spiral as the ribbon 22 rotates. A discharge port 23 is provided at a moving end of the inner cylinder 10 at an end opposite to the intake port 21, and the dry raw material is returned from the discharge port 23 into the outer cylinder 3. In this manner, the dried raw material is circulated and conveyed in the outer cylinder 3 and the inner cylinder 10, and is dried by the hot water heat of the outer cylinder hot water jacket 5 and the inner cylinder hot water jacket 16 in this conveyance process. As described later, the inside of the outer cylinder 3 and the inner cylinder 10 is depressurized by the vacuum pump E. This reduced pressure (60 to 80 Torr) lowers the boiling point of water and enables drying at low temperatures.
[0027]
The basic configuration of the cylindrical dryer is described in detail in Japanese Patent Application Laid-Open No. 2001-327845 filed by the same applicant, and therefore, detailed description is omitted. This dryer uses media as a drying medium. This medium is a short cut of a metal pipe. In this embodiment, a short cut of a stainless steel pipe is used as an example of this medium in order to prevent rust.
[0028]
By stirring the medium and the dry raw material together, the contact ratio of the dry raw material to the medium is increased and drying is promoted. This medium is likely to roll if the outer shape and length of the cylinder are substantially the same. Since this medium is made of metal, it has good thermal conductivity and can efficiently transfer heat by contacting the dry raw material. The stirring, mixing, and pulverization of the dry raw material are performed by the medium. Further, since the medium is a tubular part, the mutual contact between the media can enhance the stirring effect. The inside of the dryer body is previously filled with a certain amount of media. Since this medium can be used in a circulating manner, it is not usually necessary to newly add and discharge the medium according to the frequency of drying. Used for drying operation repeatedly and continuously.
[0029]
Next, the drying operation of the hot water dryer 1 having such a configuration will be described. The hot water dryer 1 is a batch type dryer. First, a predetermined amount of the measured dry raw material is introduced from the dry raw material inlet 8 of the outer cylinder 3. When the dry raw material has been charged, the dry raw material inlet 8 and the dry material discharge port 9 are closed with the lids 8a and 9a. Thereby, the inside of the hot water dryer 1 is in a closed state. Since the medium has been filled in advance, the dried raw material is moved by the plurality of stirring blades 19 of the inner cylinder 10 as the inner cylinder 10 rotates, and is stirred and mixed.
[0030]
The rotation of the inner cylindrical body 10 is performed by the drive motor 13 of the base 2 via the sprockets 12, 14 and the chain 15. The electric power of the drive motor 13 is obtained by the diesel engine generator A. The dry raw material is gradually moved toward the lower part A in the outer cylinder 3 while being stirred and mixed by the stirring blade 19 and pushed to the end side. In this movement process, the dried raw material is heat-exchanged and dried by the outer cylinder warm water jacket 5 and the inner cylinder warm water jacket 16 provided on the outer cylinder 3 and the inner cylinder 10, respectively.
[0031]
The dried raw material brought to the end side of the outer cylinder 3 is scraped up by the scraping blades 20 of the inner cylinder 10, and is taken into the inner cylinder 10 from the inlet 21 of the inner cylinder 10. The taken dry raw material moves in the direction B while being stirred by the helical ribbon 22 inside the inner cylinder 10 and is brought to the other end of the inner cylinder 10.
[0032]
The dried raw material brought to the end is returned to the outer cylinder 3 from the outlet 23 at the end. The returned dried raw material is again stirred and mixed by the stirring blades 19 of the inner cylinder 10, and thereafter, is repeated. When the dry raw material passes through the inner cylinder 10, it is heated and dried by the heat of the inner cylinder warm water jacket 16 of the inner cylinder 10. That is, drying of the dry raw material is promoted by heat exchange between the dry raw material and warm water by the heat transfer of the jacket wall. The drying raw material is circulated through the outer cylindrical body 3 and the inner cylindrical body 10 and is dried. The drying raw material contains the above-described medium. Therefore, drying of the above-mentioned dry raw material is further promoted by the mixture of the medium.
[0033]
On the other hand, the inside of the outer cylinder 3 and the inner cylinder 10 is filled with warm and moist steam, and is exhausted to the outside by a vacuum pump E installed outside. It is preferable that the degree of vacuum inside the outer cylinder 3 and the inner cylinder 10 is maintained at 60 to 80 Torr by the vacuum pump E. In the drying operation, when the temperature of the hot water as the drying heat source is around 80 ° C., the surface temperature of the hot water jacket, which is the contact surface with the dry raw material, is lower than this. For this purpose, the inside of the outer cylinder 3 and the inner cylinder 10 is depressurized by a vacuum pump installed outside. This reduced pressure (60 to 80 Torr) lowers the boiling point of water and enables drying at low temperatures.
[0034]
The steam in the hot water dryer 1 is discharged to the outside from a discharge port 24 provided at the upper center of the outer cylinder 3. The discharged steam is condensed in the condenser D. After the drying operation is completed, the vacuum pump E is stopped, and the reduced pressure state inside the hot water dryer 1 is released to return to the normal state. Next, the dried material discharge port 9 is opened, and the inner cylindrical body 10 is rotated to move the dried material, move it toward the dried material discharge port 9 side, and discharge the dried material. At this time, the medium is also discharged together, but a wire mesh of a mesh smaller than the size of the medium is provided at the dried material discharge port 9 so that the medium and the dried material are sieved.
[0035]
In other words, the medium is not discharged and remains, and the dried material is discharged as a mesh or smaller. In this way, the dried material and the medium are separated, and only the dried material is discharged. In the next drying operation, the medium remaining in the hot water dryer 1 is mixed with the dry raw material newly introduced from the dry raw material inlet, and the above-described drying operation is repeated.
[0036]
Although the dry raw material has been described as food waste, the waste subject to the present invention may be mud-like. If muddy water is dried, it can be reused as a recycled product. The heat source of the hot water has been described as a diesel engine, but there is no limitation such as a gas cogeneration system as long as the hot water can be used. Any warm water may be used as long as it meets the above description. In addition, the drive source used in this system can use the power of a diesel engine generator, which is private power generation.
[0037]
【The invention's effect】
As described above, the waste drying system of the present invention uses waste heat of the prime mover that performs power generation by alternately and repeatedly circulating hot water and cooling water between the prime mover and the hot water dryer. It can be used effectively without. In addition, the present invention can be applied to a dryer having a double-tube drying configuration of an outer cylinder and an inner cylinder to increase the drying efficiency and improve the processing capacity. Further, the system can be reduced in size, and it becomes possible to recycle food waste and the like as fertilizer without discarding.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a waste drying system of the present invention.
FIG. 2 is a front view of the hot water dryer.
FIG. 3 is a side view of the hot water dryer.
[Explanation of symbols]
A ... Diesel engine generator B ... Water pump C ... Pipe line D ... Condenser E ... Vacuum pump 1 ... Hot water dryer 3 ... Outer cylinder 5 ... Outer cylinder hot water jacket 10 ... Inner cylinder 16 ... Inner cylinder hot water jacket 19 … Stirring blades 22… ribbon

Claims (6)

In a waste drying system in which the cooling water of the prime mover that generates power uses hot water heated by waste heat to dry waste,
A hot water drier having a double drying structure of an outer cylinder and an inner cylinder, receiving the supply of the hot water, stirring and mixing the waste to dry,
A vacuum pump for keeping the inside of the hot water dryer at a pressure lower than the atmospheric pressure,
A waste drying system comprising a pipeline for circulating the hot water between the hot water dryer and the prime mover, wherein the waste is dried using waste heat of the prime mover. The waste drying system according to claim 1,
The waste water drying system, wherein the hot water dryer is a batch type dryer. The waste drying system according to claim 1,
A waste drying system, wherein the prime mover is a diesel engine. The waste drying system according to claim 1,
A waste drying system comprising a condenser for condensing steam generated in the hot water dryer. The waste drying system according to claim 1,
A waste drying system, wherein the hot water dryer has media mixed therein so as to circulate together with waste. The waste drying system according to claim 1,
The waste drying system according to claim 1, wherein a degree of vacuum of the vacuum pump is 60 to 80 Torr.

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