JPH08226625A - Mixed combustion device for waste edible oil - Google Patents

Abstract

PURPOSE: To permit the reutilization of used waste edible oil effectively as the fuel resource for a boiler and the like by a method wherein the proper amount of used waste edible oil in a reserving tank is mixed into fuel oil. CONSTITUTION: A mixed fuel combustion device for waste edible oil 11 is provided with a heavy oil supplying system 12, supplying heavy oil to a burner 111 from a service tank, and a waste oil supplying system 13, supplying waste edible oil to the burner 14 from a waste oil reserving tank 21, reserving used waste edible oil, while these oil supplying series 12, 13 are joined before a strainer 20 to mix the heavy oil and the waste edible oil. The mixing ratio between the heavy oil and the waste edible oil is specified so that 30% of waste edible oil is mixed into 70% of A-heavy oil, for example. The heavy oil and the waste edible oil are transferred by variable constant flow rate pumps 15, 16 provided in respective series 12, 13. Comparatively big foreign matters, mixed into the waste edible oil, are removed in the stage of throwing by a filter plate provided at the inlet port of the waste oil. According to this method, the used edible oil can be reutilized effectively as fuel resource for the boiler and the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an edible waste oil mixing and burning apparatus, and more particularly to a technique for disposing of edible waste oil by mixing with fuel oil such as a boiler and burning it.

[0002]

2. Description of the Related Art In kitchen facilities such as hotels and restaurants, edible oil is used for various cooking such as tempura and fried food, and a large amount of edible oil is discharged after use. Such edible waste oil is conventionally collected by a waste oil processing company and disposed of as waste.

On the other hand, for waste oil of industrial mineral oil, a technique of reusing it as fuel for boilers has been proposed recently. For example, JP-A-52-34577 relates to a device for purifying waste oil and then reusing it as a heat source.
As shown in FIG. 10, the waste oil in the storage tank 1 is sequentially introduced into the precipitation separation tanks 2 and 3 and the filtration tank 4 to remove the contained metal such as chips and sawdust and other solid contaminants, and at the same time to remove water. Separate soap and soap. Further, the waste oil that has passed through the filtration tank 4 is guided to a pipe 8 in a hot water tank 6 in which another pipe 7 for passing high-temperature exhaust gas such as a boiler is installed through a storage tank 5, and the waste oil after purification is heated in the hot water tank 6. After reducing its viscosity to increase its fluidity, it is led to the burner 9 to be injected and burned.

[0004]

By the way, in the conventional disposal of edible waste oil, even if a processing company equipped with a dedicated facility is requested from the viewpoint of the transportation cost and processing cost of the waste oil, It costs a considerable amount of money, and especially for large-scale hotels, restaurants, restaurants, etc. that use a large amount of cooking oil on a daily basis, the financial burden of disposing of waste oil cannot be ignored. ing. further,
Since such waste oil pollutes the water quality of rivers, lakes and marshes and causes environmental damage, it is desired to provide a new treatment system from the viewpoint of environmental conservation.

On the other hand, Japanese Patent Laid-Open No. 34577/52 attempts to dispose of waste oil by burning the waste oil in a boiler or the like and at the same time to utilize it as a fuel resource. However, there is still room for improvement. That is, the device of JP-A-52-34577 filters impurities contained in the waste oil in order to enable injection combustion from the burner, but the filter net is horizontally arranged in the filter tank. The structure is set up. For this reason,
All the filtered impurities will be deposited on the filter net, and the filter net is likely to be clogged, and frequent maintenance such as removal of contaminants and replacement of the filter net is required.

Further, in this apparatus, the waste oil is heated in the preceding stage of the burner in order to facilitate the injection from the burner, but the precipitation separation tank and the filtration tank for purifying the waste oil are not equipped with any heating means. Therefore, especially in winter and cold regions where the temperature of the waste oil decreases, it becomes difficult to precipitate and filter the contaminants due to the increase in viscosity and the decrease in fluidity, and the ability to purify the waste oil in the precipitation tank and the filtration tank is increased. Will decrease. Further, if waste oil with a large amount of residual contaminants flows into the filter tank from the settling tank, the load on the filter tank increases, and, in combination with the arrangement structure of the filter net, frequent cleaning of the filter net is not possible. Will be needed. In addition, this equipment is a waste oil tank, settling tank (two tanks),
Since the filter tank, the purified oil storage tank, and the hot water tank are separately formed, the device becomes large and a large installation space is required.

Therefore, an object of the present invention is, firstly, to dispose of waste oil, particularly edible waste oil, and to effectively reuse it.
The second is to obtain a device structure suitable for reuse.

[0008]

In order to achieve the above object and solve the problems, an edible waste oil mixed combustion apparatus according to the present invention is provided with a combustor for injecting fuel oil from a nozzle for combustion and a combustor for the combustor. A fuel oil supply means for supplying fuel oil, a storage tank for storing used edible waste oil, and an edible waste oil mixing means for appropriately mixing the edible waste oil in the storage tank with the fuel oil are provided. . Further, the storage tank includes a waste oil input port for inputting edible waste oil and a waste oil discharge port for discharging edible waste oil, and a predetermined height dimension from the bottom of the tank between the waste oil input port and the waste oil discharge port. In some cases, a partition wall including a weir wall standing upright and a strainer standing on the top of the weir wall is provided, and a heat pipe for heating the stored waste oil by the flow of the heat medium is provided in the tank.

[0009]

In the edible waste oil mixing / burning apparatus according to the present invention, while the fuel oil is supplied to the combustor by the fuel oil supply means, the edible waste oil is mixed with the fuel oil by the edible waste oil mixing means. The mixed waste oil is burned with the fuel oil in the combustor. As the combustor, for example, a burner included in a boiler is suitable. That is, according to the present invention, for example, waste oil of cooking oil discharged in a kitchen such as a hotel or an inn can be burned and disposed of in a boiler for heating or hot water supply. Moreover, not only is it possible to dispose of waste oil, but it is also possible to utilize edible waste oil as a fuel resource for the boiler, and it is also possible to save the main fuel of the boiler, such as heavy oil and kerosene. Further, since edible oil contains almost no sulfur content, it is possible to reduce the amount of sulfur oxides contained in the exhaust gas of the boiler and contribute to the prevention of air pollution.

The type (structure) of the boiler is not particularly limited,
For example, it may be a fire tube boiler, a water tube boiler, or the like. Similarly, the burner may be of any type such as a high pressure spray burner, a hydraulic spray burner, a rotary burner, a low pressure spray burner, and an internal mixing burner. Further, not only the boiler but also a so-called industrial furnace such as a heating furnace, a melting furnace, a ceramic furnace, etc. can be applied, and edible waste oil may be mixed and burned by an oil burner provided therein. Further, the fuel oil includes various liquid fuels such as heavy oil, kerosene, and light oil used in these combustors. The fuel oil and the edible waste oil may be mixed, for example, by feeding the fuel oil and the edible waste oil through separate pipes, combining them in front of the burner, and mixing them through a line blender, or a mixing tank. May be provided, and the mixture may be stirred and mixed in the tank.

The storage tank for storing the edible waste oil is preferably provided between the waste oil input port and the waste oil discharge port, and a weir wall standing upright at a predetermined height from the bottom of the tank, and standing on the top of the weir wall. And a heat pipe for heating the stored waste oil is provided. That is, according to such a storage tank, the weir wall provided in the tank blocks the waste oil flowing from the waste oil input port to the waste oil discharge port, and forms an overflow (overflow) that flows over the top of the waste oil and flows down. To do. Then, since this overflow passes through a strainer standing on the top of the weir wall, solid impurities contained in the waste oil are removed by this strainer. Further, the water contained in the waste oil precipitates on the bottom of the tank, but the weir wall prevents the precipitated water from flowing down (to the waste oil discharge port side), so that the water can be separated from the waste oil.

Further, in the present storage tank, even when used in winter or in cold regions, it is possible to heat the stored waste oil and reduce the viscosity of the waste oil by flowing the heat medium through the heat pipes, so that it is possible to reduce moisture and water content. It is possible to facilitate the filtration precipitation of contaminants. It should be noted that heating in the heat pipe may be omitted in the summer or the like when the temperature of the waste oil does not decrease.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a view showing an example of an edible waste oil mixing and burning apparatus according to the present invention. As shown in the figure, this co-firing device 11 includes a heavy oil supply system 12 that supplies heavy oil from a service tank to a burner 14 (boiler), and a waste oil supply system 13 that supplies edible waste oil from a waste oil storage tank 21 that stores edible waste oil.
The fuel oil and the edible waste oil are mixed by merging these refueling systems 12 and 13 in front of the strainer 20. The transfer of the fuel oil and the edible waste oil is performed by the variable constant flow pump 15 and the constant flow pump 16 provided in each system, and an oil meter and solenoid valves 18 and 19 are appropriately provided in each piping path. Waste oil storage tank 2
1, a steam drain 22 for heating the stored waste oil, and a lamp 2 for issuing an alarm when the amount of oil exceeds a certain amount.
3 is provided. The structure of the waste oil storage tank 21 will be described later.

Further, this apparatus is constructed so that the edible waste oil can be supplied from the waste oil tank 21 through the header 17 to a plurality of (for example, three) boilers. still,
In this case, edible waste oil is similarly supplied to the heavy oil supply system for each boiler. Further, in this device, it is also possible to operate only with heavy oil (fuel oil) by closing the solenoid valve 18 and shutting off the waste oil supply system 13. Further, by changing the oil supply flow rate of the edible waste oil by the variable constant flow pump 15, the mixing ratio of the fuel oil and the waste oil can be changed. In addition, for example, in the summer when the load on the boiler is small,
In order to reduce the amount of heavy oil supplied to the boiler (burner 14), part of the heavy oil supplied by the constant flow pump 16 is returned to the feedback system 2.
You can return it to the service tank through No. 4.

2 to 4 are a front sectional view, a plan view and a side view showing the structure of the waste oil storage tank, respectively. The waste oil tank 21 includes a waste oil input port 25 for inputting waste oil and a waste oil discharge port 26 for sending out the waste oil, and three partition walls 27, 28, 29 are provided between the input port 25 and the discharge port 26. There is. These partition walls are composed of weir walls 30, 31, 32 standing upright from the bottom of the tank at a predetermined height, and strainers 33 to 38 standing on the top of the weir walls. Weir walls 30-32
Is made higher on the upstream side (input port side) in consideration of smoothing the flow of waste oil from the input port side to the discharge port side, and considering that the input port side has more water and impurities that precipitate and separate. . Further, the strainers 33 to 38 are installed such that the meshes are finer toward the downstream side (exhaust port side), the first stage strainers 33 and 34 are, for example, 60 mesh, the second stage strainers 35 and 36 are, for example, 100 mesh, The third-stage strainers 37 and 38 are, for example, 150 (or 120) mesh. It should be noted that each of these strainers 33 to 38 has a handle 39 at the upper end as shown in FIG. 5, and is installed detachably from the tank.

A drain 40 is provided at the bottom (tank bottom) of each of the storage chambers divided by the partitions 27 to 29 to discharge the precipitated water and foreign substances. Also the tank 21
Can be moved by the casters 41 provided on the bottom surface. Further, as shown in FIG. 6, a heat pipe 22 for heating the stored waste oil is arranged in the tank 21 in a meandering manner along the partition walls 27 to 29. High-temperature steam, such as steam drain, kitchen exhaust, and boiler exhaust, flows through the heat pipe 22 as a heat medium. As shown in FIG. 2, the height of the heat pipe 22 from the bottom of the tank is lowered toward the downstream side (exhaust port side), and each of the pipe portions passing through the respective storage chambers has a downstream weir wall. It is desirable that the height be as follows. Even if the amount of waste oil stored is small, this is because each pipe part is located in the waste oil to improve the heating efficiency of the waste oil, and the pipe is exposed from the oil liquid surface and adheres to the pipe surface. This is to prevent the waste oil from being overheated and generating an unpleasant odor. In this embodiment, the upper surface of the downstream weir wall and the upper surface of the piping portion are arranged at substantially the same height.

FIG. 7 is an enlarged view of the waste oil input port. As shown, the waste oil input port 25 is provided with a lid 4 that can be opened and closed.
2, and further below the pipe grid 43, there are two filter plates 44 and 45 for removing relatively large contaminants mixed in the waste oil at the charging stage. The mesh of the filter plates 44 and 45 is made finer in the lower stage than in the upper stage.
The upper filter 44 is, for example, 30 mesh, and the lower filter 45 is, for example, 60 mesh. 8 and 9
An example of the pipe grating 43 and the filter plate 44 (45) is shown in FIG.

According to the present storage tank 21, the weir walls 30 to 32, which are provided in multiple stages in the tank, block the waste oil introduced from the waste oil inlet 25, and overflow the overflow (overflow) which flows over the top of the weir. Can be formed. And this overflow is a strainer 33-3 standing upright on the top of each weir wall.
Since it passes through No. 8, solid contaminants contained in the waste oil are captured and removed by these strainers. Further, the water contained in the waste oil settles at the bottom of the tank, but the weir wall 30
.About.32 prevent the precipitated water from flowing down to the waste oil discharge port side to separate and remove the water. In order to promote separation,
A water separating agent (dehydrating agent) may be appropriately added to the waste oil in the tank.

According to this apparatus, for example, in an accommodation facility such as a hotel or an inn, edible waste oil discharged from the kitchen can be burned by a boiler for heating or hot water and disposed of. Moreover, not only is it possible to dispose of waste oil, but it is possible to utilize edible waste oil as a fuel resource for boilers,
It is also possible to save boiler main fuel such as heavy oil and kerosene. Furthermore, edible oil contains almost no sulfur (unused oil is not included, and used waste oil is 0.01%).
Therefore, it is possible to reduce sulfur oxides contained in the exhaust gas of the boiler and to contribute to the prevention of air pollution. Also,
According to the waste oil storage tank proposed by the present invention, edible waste oil can be efficiently purified in a small space.

The present invention is not limited to the above embodiment. For example, in the embodiment, three weir walls and six strainers are provided between the waste oil input port and the discharge port, but the number of weir walls may be one stage or two stages, or four or more stages. It doesn't matter. Similarly, the number of strainers may be, for example, 1 to 5, or 7 or more. In addition, preferably, a plurality of strainers (two in the embodiment) are installed for each partition wall as in the above embodiment. This is to prevent the waste oils stored in the respective storage chambers across the strainer from being mixed with each other when the strainer is removed (for example, when cleaning the strainer).

The mixing ratio of the heavy oil and the edible waste oil is not particularly limited. For example, 30% of the edible waste oil can be mixed with 70% of the A heavy oil (JIS type 1 heavy oil). According to this mixing ratio, it also complies with JIS standard items (reaction, flash point, viscosity, pour point, sulfur content, residual carbon content, ash content and water content) of heavy oil. Of course, this mixing ratio is shown as an example, and can be appropriately changed. Also,
As the fuel oil, B heavy oil (type 2 heavy oil), C heavy oil (type 3 heavy oil), so-called mixed heavy oil in which kerosene or light oil is mixed may be used.

Further, when the present invention is used in a boiler,
As the burner, for example, a rotary burner equipped with a pilot ignition device can be used. Further, a high-pressure air spray burner, a steam spray burner, a hydraulic spray burner, a low-pressure spray burner, an internal mixing burner, or the like may be used. Also, the ignition device may be, for example, an electric ignition device of a direct ignition type or another type. Further, the structure of the boiler is not particularly limited, for example, a tube smoke tube boiler or a water tube boiler. Furthermore, the present invention can be applied to so-called industrial furnaces such as heating furnaces, melting furnaces, and kilns, and other oil combustion devices in addition to boilers, and edible waste oil can be co-firing with these combustion devices. .

[0023]

As described above, according to the edible waste oil mixed burning apparatus according to the present invention, the edible waste oil can be disposed of, and at the same time, it can be effectively reused as a fuel resource such as a boiler.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of an edible waste oil mixing and burning apparatus according to the present invention.

FIG. 2 is a front cross-sectional view showing an example of a waste oil storage tank provided in the edible waste oil mixed combustion apparatus.

FIG. 3 is a plan view of the waste oil storage tank.

FIG. 4 is a side view of the waste oil storage tank.

FIG. 5 is a diagram showing an example of a strainer installed in the waste oil storage tank.

FIG. 6 is a plan view showing an example of a heat pipe installed in the waste oil storage tank.

FIG. 7 is a view showing a waste oil input port of the waste oil storage tank.

FIG. 8 is a plan view showing a pipe installed at a waste oil input port.

FIG. 9 is a plan view showing a filter similarly installed in the waste oil input port.

FIG. 10 is a diagram showing an example of a conventional waste oil combustion device.

[Explanation of symbols]

 11 Mixed Burning Device 12 Heavy Oil Supply System 13 Waste Oil Supply System 14 Burner (Boiler) 15, 16 Variable Constant Flow Pump 17 Waste Oil Header 18, 19 Solenoid Valve 20 Strainer 21 Waste Oil Storage Tank 22 Heat Piping 23 Warning Lamp 24 Heavy Oil Return System 25 Waste Oil Input port 26 Waste oil discharge port 27, 28, 29 Partition wall 30, 31, 32 Weir wall 33-38 Strainer 39 Handle 40 Drain 41 Castor 42 Lid 43 Pipe lattice 44, 45 Filter plate

Claims (2)

[Claims] 1. A combustor for injecting and burning fuel oil from a nozzle, a fuel oil supply means for supplying fuel oil to the combustor, a storage tank for storing used edible waste oil, and the storage tank. And an edible waste oil mixing means for mixing an appropriate amount of edible waste oil therein to the fuel oil. 2. The storage tank is provided with a waste oil input port for inputting edible waste oil and a waste oil discharge port for discharging edible waste oil, and between the waste oil input port and the waste oil discharge port, a predetermined amount is provided from the bottom of the tank. A partition wall composed of a weir wall standing upright in a height dimension and a strainer standing on the top of the weir wall is provided, and a heat pipe for heating the stored waste oil by the flow of the heat medium is further arranged. The edible waste oil mixed firing apparatus according to claim 1.