KR101771616B1 - Heat Exchanger For Heating Boiler - Google Patents

Heat Exchanger For Heating Boiler Download PDF

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Publication number
KR101771616B1
KR101771616B1 KR1020150061929A KR20150061929A KR101771616B1 KR 101771616 B1 KR101771616 B1 KR 101771616B1 KR 1020150061929 A KR1020150061929 A KR 1020150061929A KR 20150061929 A KR20150061929 A KR 20150061929A KR 101771616 B1 KR101771616 B1 KR 101771616B1
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South Korea
Prior art keywords
pipe
flow pipe
hot water
water
flow
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KR1020150061929A
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Korean (ko)
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KR20160130035A (en
Inventor
김용수
김용규
김향숙
백사희
이재희
Original Assignee
김용수
김용규
김향숙
백사희
이재희
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 김용수, 김용규, 김향숙, 백사희, 이재희 filed Critical 김용수
Priority to KR1020150061929A priority Critical patent/KR101771616B1/en
Publication of KR20160130035A publication Critical patent/KR20160130035A/en
Application granted granted Critical
Publication of KR101771616B1 publication Critical patent/KR101771616B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/0008—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one medium being in heat conductive contact with the conduits for the other medium
    • F28D7/0016—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one medium being in heat conductive contact with the conduits for the other medium the conduits for one medium or the conduits for both media being bent
    • F24H9/122—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • F28D7/12—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically the surrounding tube being closed at one end, e.g. return type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/06—Derivation channels, e.g. bypass

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Fluid Heaters (AREA)

Abstract

The present invention relates to a boiler heat exchanger including a flow pipe provided in a state of being wound around an outer circumferential surface of a main body and having a heating water generated through heat exchange with a main body while flowing water flowing into a receiving port of one end, In the heat exchanger, a return pipe is connected to both ends of the flow pipe so as to communicate with the outlet port and the inlet port of the flow pipe, and a part of the heating water discharged to the outlet port is bypassed to the inlet port and mixed with the water flowing into the inlet port, And the heat exchanger is supplied in an elevated state.

Description

[0001] Heat exchanger for heating boiler [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a heat exchanger provided in a boiler, and more particularly, to a boiler heat exchanger capable of rapidly supplying hot water and hot water by improving efficiency of a heat exchanger.

Generally, boilers used for heating or hot water supply can be divided into low-boiling boilers and hot-water boilers according to the method of heating hot water.

The hot water boiler has a structure in which cold water introduced into a direct water pipe is supplied to a heat exchanger by a pump, heated by a burner, and temporarily stored in a hot water tank.

The hot water tank and the heating pipe are connected to each other by three-way valves. When the user intends to use the hot water, hot water heated by the burner is discharged to the hot water pipe. On the other hand, When the hot water pipe is closed, the heating water is circulated through the heating pipe.

The hot water boiler is advantageous in that the hot water tank is instantly heated by the burner. However, since the hot water boiler takes a long time to convert cold water into hot water, the user can not use the hot water. There is a disadvantage that hot water can not be used in case of reuse immediately after discontinuation of use.

Since the hot water heated by the burner is distinguished from the hot water heated by the burner, the cold water introduced through the direct water pipe is always heated to a proper high temperature by the heat exchange coil installed in the hot water tank, And since the hot water is stored at an appropriate high temperature even in the intermittent use of the hot water, the hot water can be used immediately.

On the other hand, the low boiling type boiler has a large hot water tank to allow the user to use the hot water, but the area of the heat exchange coil installed in the hot water tank is not sufficient to quickly convert the water filled in the hot water tank into hot water.

Therefore, the low-boiling boiler has a disadvantage in that it takes a long time to heat the hot water stored in the hot water tank because the heat-exchanging coil can not heat the entire portion of the hot water tank, and the size of the hot water tank limits the installation site However, there is a disadvantage that the weight of the boiler becomes heavy and the production cost is high.

Therefore, there is a need to research and develop a new type of heat exchanger that can take advantage of the advantages of the hot-water type and low-boiling type boilers.

1 is a cross-sectional view showing an embodiment of a conventional boiler heat exchanger. The conventional heat exchanger includes a cylindrical main body 1 having an internal combustion chamber 2 formed therein, And a communication passage 3 through which the exhaust gas generated in the combustion chamber 2 is discharged.

A plurality of baffles 4 are provided inside the combustion chamber 2 of the main body 1. A communicating tube 5 communicating with the combustion chamber 2 is provided at one side of the main body 1, A burner 6 is provided at an end of the burner.

A flow pipe 10 through which water supplied from a direct water pipe (not shown) flows is provided on the outer circumferential surface of the main body 1 in a spiral shape on the outer peripheral surface of the main body 1.

One end of the flow pipe 10 is formed as a water inlet 10a connected to the direct water pipe and the other end of the flow pipe 10 is formed as a water outlet 10b through which the heating water generated by the heat exchange is discharged.

Therefore, when the flame generated in the burner 6 heats the air inside the combustion chamber 2, the heated high-temperature exhaust gas escapes to the communication 3 via the baffle 4 in the combustion chamber 2, The water flowing through the inlet 10a of the flow tube 10 wound in the form of a spiral on the outer peripheral surface of the main body 1 is heated in the process of being discharged to the outlet 10b so that the heating water and hot water "). ≪ / RTI >

However, since the conventional heat exchanger having such a structure is required to heat a large amount of water flowing in the flow pipe 10, there is a limit in generating heating water in a short period of time. Therefore, There is a problem that the heat exchange efficiency is remarkably lowered.

The technology of the boiler heat exchanger as described above is described in detail in the following prior art documents, so that a detailed description thereof will be omitted.

Korean Patent No. 10-0350161 Korean Patent No. 10-0458918

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide an apparatus and a method for bypassing a part of heating water (hot water) And it is an object of the present invention to provide a boiler heat exchanger capable of rapidly generating and supplying hot water (hot water) at a high temperature and improving heat exchange efficiency of the heat exchanger.

In addition, the hot water near the inlet port is bypassed from the middle portion of the flow port continuous from the inlet port to the outlet port of the flow pipe, and is transmitted to the flow pipe near the outlet port to rapidly generate and supply hot heating water (hot water).

The above bypass can be installed in plural and can be applied to both boiler and power plant.

The above object is achieved by a heat exchanger comprising a flow pipe provided in a state of being wound around an outer circumferential surface of a main body, and a heating water generated by heat exchange with a main body while flowing water flowing into an inlet of one end, And a return pipe connected to the outlet port and the inlet port of the flow pipe so that both ends thereof communicate with the outlet port of the flow pipe, and a part of the heating water discharged to the outlet port is bypassed to the inlet port, mixed with the water flowing into the inlet port, Is achieved by a heat exchanger.

In order to achieve this, the diameter of the outlet port of the flow pipe is formed to be larger than the diameter of the inlet port, so that the pressure of the outlet port is formed to be higher than the pressure of the inlet port.

In addition, one end of the return pipe is provided to be inserted into the inlet port of the flow pipe, and a bracket protrudes from the outer circumferential surface of one end of the return pipe, so that the flow of water flowing into the inlet port of the flow pipe can be vortexed easily. At this time, the shape of the bracket may be variously formed. In the present invention, for example, the bracket may have a cross-sectional shape and its end portion may be spaced apart from the inner circumferential surface of the inlet of the flow tube.

The flow pipe is provided with a plurality of sub return pipes which connect the upper and lower portions of the flow pipe to bypass the heated water of the upper portion of the flow pipe to the lower portion. The flow pipe, to which the upper end of the sub return pipe is connected, It is preferable that the tube portion is formed with a diameter larger than that of the flow tube so that the pressure of the tube portion is made higher than the pressure of the flow tube.

According to the boiler heat exchanger of the present invention, a part of the heating water discharged to the outlet port of the flow pipe is bypassed to the inlet port and mixed with the water flowing into the inlet port so that the temperature of the incoming water is first raised, And hot water can be rapidly generated and supplied, and the heat exchange efficiency of the heat exchanger can be improved.

The number of the return pipes to be bypassed as described above can be increased to improve the heat exchange efficiency. Further, the efficiency of the return pipe can be improved because heat exchange is possible through the heat of the combustion chamber.

1 is a view showing a conventional boiler heat exchanger.
2 is a view showing a boiler heat exchanger according to an embodiment of the present invention.
3 is an enlarged view of the portion "A" in Fig.
4 is a view seen from the direction of "B" in Fig.
5 is a partial cutaway view showing a boiler heat exchanger according to another embodiment of the present invention.
6 is a view showing a boiler heat exchanger according to a general embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Terms used in this process are terms defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

In addition, the following embodiments are not intended to limit the scope of the present invention, but merely as exemplifications of the constituent elements set forth in the claims of the present invention, and are included in technical ideas throughout the specification of the present invention, Embodiments that include components replaceable as equivalents in the elements may be included within the scope of the present invention.

In the following embodiments, optional terms such as "first", "second", "one side", "another side", etc. are used to distinguish one element from another, But is not limited by the terms. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of related arts which may unnecessarily obscure the gist of the present invention will be omitted.

2 to 5 are views showing a boiler heat exchanger according to the present invention.

First, before describing the present invention, the same reference numerals are given to the same parts as in the prior art, and redundant explanations are omitted.

2, a boiler heat exchanging apparatus according to an embodiment of the present invention includes a water outlet 200b and a water inlet 200a of a flow pipe 200 wound on a circumference of a main body 1 of a heat exchanger, (Not shown).

Both end portions of the return pipe 100 are connected to the outlet port 200b of the flow pipe 200 and the inlet port 200a so as to connect the outlet port 200b and the inlet port 200a.

The return pipe 100 provided as described above bypasses a part of the heating water discharged to the outlet port 200b of the flow pipe 200 to the inlet port 200a and supplies the cold water to the inlet port 200a Water), and the water is supplied into the flow pipe 200 in a state where the temperature of the water is raised, so that hot water of high temperature can be rapidly generated.

Particularly, the inlet port 200a and the outlet port 200b of the flow pipe 200 protrude to the outside of the main body 1 of the heat exchanger, and the diameter D2 of the outlet port 200b is smaller than the diameter D1 of the inlet port 200a. (D1 < D2). When the diameter D2 of the outlet 200b is larger than the diameter D1 of the inlet 200a, the flow velocity of the outlet 200b is lower than the flow velocity of the inlet 200a, (P2) is formed to be higher than the internal pressure P1 of the inlet 200a (P1 < P2).

A part of the heating water discharged to the outlet port 200b of the flow pipe 200 due to the pressure difference between the outlet port 200b and the inlet port 200a flows into the inlet port 200a of the flow pipe 200 through the return pipe 100, .

2, a part of the heating water (shown by a dashed line arrow) discharged through the outlet port 200b of the flow pipe 200 is bypassed to the inlet port 200a of the flow pipe 200 and is supplied again, The temperature of the water supplied to the inlet 200a is first increased by mixing the cold water t1 (shown by the dashed arrow) and the heating water t2 flowing into the inlet 200a from the direct water pipe, The temperature t3 of the heating water (indicated by the solid line arrow) discharged from the outlet 200b through the heat exchange with the main body 1 of the heat exchanger through the flow pipe 200 is rapidly The temperature can be increased.

The measurement temperature of the heating water by the heat exchanger of the present invention having the return pipe and the conventional heat exchanger without the return pipe time The temperature (t2) of the heating water by the conventional heat exchanger The temperature (t3) of the heated water by the heat exchanger according to the present invention 11:08 9 ℃ 9 ℃ 11:18 21 ℃ 25 ℃ 11:28 32 ℃ 37 ℃ 11:33 36 ℃ 42 ° C 11:38 41 C 47 C 11:43 43 ℃ 51 ℃

Table 1 shows the results of the measurement at the same time on the same day. The measurement result shows that the heating water discharged through the outlet 200b of the flow pipe 200 at intervals of 10 minutes from the beginning to 3 times, The temperature was measured.

Therefore, as can be seen from Table 1, at the initial stage of operation of the heat exchanger, the temperature of the heating water discharged from the conventional and the heat exchanger according to the present invention was the same, but the cold water t1 was supplied The present invention is not limited to the heat exchanging apparatus according to the present invention in which a part of the heating water t2 is bypassed to the inlet 200a of the flow pipe 200 and mixed with the cold water t1 through the return pipe 100, It was found that the temperature (t3) of the heating water by the apparatus was increased much more quickly (t2 <t3), and it was found that the heat exchanging apparatus according to the present invention was also superior in terms of energy efficiency.

3, one end of the return pipe 100 connected to the inlet 200a of the flow pipe 200 is inserted through the inlet 200a and is positioned parallel to the axial direction of the inlet 200a Respectively.

A bracket 110 having a cross-sectional shape is installed on the outer peripheral surface of one end of the return pipe 100 inserted into the inlet 200a of the flow pipe 200. The bracket 110 is connected to the return pipe 100, And the bracket 110 and the fixing band 120 may be formed of stainless steel.

The bracket 110 may be formed in a ring shape surrounding the front outer circumferential surface of the return pipe 100. It is preferable that the bracket 110 is installed at a predetermined interval on the outer circumferential surface of the return pipe 100, While the end of the bracket 110 is spaced apart from the inner circumferential surface of the inlet 200a of the flow tube 200.

Therefore, the vortex is generated in the flow of the cold water t1 (water supplied through the direct water pipe) flowing into the inlet 200a of the flow pipe 200 by the bracket 110 provided in the return pipe 100, And the mixing of the cold water t1 and the heating water t2 bypassed to the inlet 200a through the return pipe 100 due to the delay of the cold water t1 can improve the stirring efficiency do.

When the efficiency of stirring the heating water t2 and the cold water t1 bypassed is improved, the temperature of the water flowing into the inlet 200a of the flow tube 200 is first elevated and the heat exchanged by the heat exchanger The temperature t3 of the heating water can be also rapidly increased.

5 is a partial cutaway view showing a boiler heat exchanger according to another embodiment of the present invention. The same reference numerals are given to the prior art and the above-described embodiments, and redundant explanations are omitted.

5, a plurality of sub return pipes 100a and 100b are provided in a flow pipe 200 wound in a spiral shape on the outer circumferential surface of the main body 1 of the heat exchange apparatus, Although only two sub return pipes 100a and 100b are illustrated in the present embodiment, more sub return pipes may be provided at regular intervals.

The sub return pipe includes a first sub return pipe 100a provided in the upper flow pipe 200 wound around the outer peripheral surface of the main body 1 in a spiral form and a second sub return pipe 100b provided in the lower flow pipe 200, The first and second sub return pipes 100a and 100b are vertically provided in the flow pipe 200 to connect the upper portion and the lower portion of the flow pipe 200 in a communicative manner .

An expansion tube 210 having a diameter D3 larger than the diameter D1 of the flow tube 200 is formed in the flow tube 200 to which the upper ends of the first and second sub return tubes 100a and 100b are connected (D1 &lt; D3). The diameter D3 of the expanded portion 210 to which the upper ends of the first and second sub return pipes 100a and 100b are connected is smaller than the diameter D3 of the expanded pipe 210 connected to the lower end of the first and second sub return pipes 100a and 100b. The flow rate in the expanded portion 210 is relatively slower than the flow rate in the flow tube 200 because the diameter D1 of the expanded portion 200 is larger than the diameter D1 of the expanded portion 200 (D1 <D3) (P1 &lt; P3). &Lt; / RTI &gt;

Therefore, the high temperature heating water flowing into the upper ends of the first and second sub return pipes 100a and 100b due to the difference in pressure between the expanded portion 210 and the flow pipe 200, And is automatically discharged to the lower end of the main body 100b.

The high temperature heating water discharged from the first and second sub return pipes 100a and 100b is mixed with the relatively low temperature heating water flowing in the lower portion of the flow pipe 200, The temperature of the water can be raised quickly overall.

Figure 6 shows a general view of a boiler invented in the present invention.

As shown in the drawing, the return pipe receives the hot water from the supply point of the flow pipe, and discharges hot water supplied from the discharge point of the flow pipe to the flow pipe.

At this time, a plurality of return pipes (sub return pipes) can be installed. Since the diameter of the supply pipe of the flow pipe is larger than the diameter of the discharge pipe of the flow pipe, the pressure of the supply pipe is higher than that of the discharge pipe, It can be seen that the hot water is returned.

Since both the return pipe and the sub return pipe described above are located in the vicinity of the combustion chamber, it is natural that the heat generated from the combustion chamber is transferred to the return pipe and the sub return pipe. Therefore, the thermal efficiency is expected to be further improved.

The sub return pipe is provided at both ends with a supply part for supplying hot water and a discharge part for discharging hot water. Since the hot water at a high temperature in the flow pipe is installed to stir hot water at a low temperature, The point (the point where the temperature of the hot water is high) is installed at the supply point, and the discharge part is formed to be installed at the discharge point, which is a point relatively dirtier than the supply point in the water outlet pipe.

Further, since the return pipe and the sub return pipe can be disposed at the same time, only the return pipe or only the sub return pipe can be disposed, the present invention can be manufactured in various forms.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification or improvement is possible.

It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

1: Outer cylinder 2: Combustion chamber
3: communication 4: baffle
5: communicating tube 6: burner
10: Flow tube 10a:
10b: Outlet port 100: Return port
100a, 100b: Sub return pipe 110: Bracket
120: fixed band 200: flow tube
200a: inlet port 200b: outlet port
210:
D1: Flow tube and inlet diameter (inner diameter)
D2: Outlet diameter of flow tube (inner diameter)
D3: Diameter of the expansion pipe of the flow pipe (inner diameter)
P1: Pressure inside inlet of flow tube
P2: Pressure inside the outlet of flow tube
P3: Internal pressure of the expansion part
t1 is the temperature of the water supplied to the inlet of the flow tube through the water pipe
t2: Temperature of the heating water discharged to the outlet of the flow pipe after heat exchange
t3: The heating water discharged to the outlet of the flow pipe is bypassed to the return pipe and re-supplied to the flow pipe, and the temperature of the heating water discharged to the outlet

Claims (6)

(Hot water) discharged from the outlet port of the flow tube is mixed with water flowing into the inlet port by bypassing a part of the heating water (hot water) discharged from the outlet port of the flow pipe, thereby providing a heat exchanger for generating and supplying hot water
Wherein the heat exchanger includes a flow pipe provided in the boiler body and the hot water generated by heat exchange with the main body while flowing water flowing into the inlet of the one end is discharged through the outlet of the other end,
And a return pipe connected to the outlet port and the inlet port of the flow pipe so as to bypass a portion of the heating water discharged through the outlet port to the inlet port to increase the temperature of the water by mixing with water flowing into the inlet port,
The diameter of the outlet port of the flow pipe is formed to be larger than the diameter of the inlet port so that the hot water returns to the return pipe, the pressure of the outlet port is made higher than the pressure of the inlet port,
One end of the return pipe is inserted into the inlet port of the flow pipe while a bracket protrudes from the outer circumferential surface of the inserted end of the return pipe to vortex the flow of water flowing into the inlet port of the flow pipe, To be stirred.
delete delete delete The method according to claim 1,
A plurality of sub return pipes are disposed in the flow pipe, and the sub return pipe is provided at both ends of a supply part installed in the flow pipe to receive hot water of the flow pipe, a discharge part installed in the flow pipe to discharge hot water, Wherein the discharge pipe is installed at a supply point which is close to the outlet pipe of the flow pipe, and the discharge pipe is installed at a discharge point which is a point relatively dirtier than the supply point in the outlet pipe. The method of claim 5,
Wherein the hot water is returned to the sub return pipe as the diameter of the supply point in the flow pipe is formed to be larger than the diameter of the discharge point and the pressure of the supply point is formed higher than the pressure of the discharge point.














KR1020150061929A 2015-04-30 2015-04-30 Heat Exchanger For Heating Boiler KR101771616B1 (en)

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KR1020150061929A KR101771616B1 (en) 2015-04-30 2015-04-30 Heat Exchanger For Heating Boiler

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KR101771616B1 true KR101771616B1 (en) 2017-08-28

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102190437B1 (en) * 2020-05-07 2020-12-11 김다혜 Apparatus for producing insect for treatment of organic waste

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Publication number Priority date Publication date Assignee Title
KR102112442B1 (en) * 2019-02-16 2020-05-18 최용식 heating apparatus having hypocaust heating

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200206391Y1 (en) 2000-03-21 2000-12-01 최진민 gas boiler for the home using the burner of bunsen type
KR100458918B1 (en) 2003-03-07 2004-12-03 주식회사 경동보일러 Pipe Joint Part Structure of Heat Exchanger for Boiler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102190437B1 (en) * 2020-05-07 2020-12-11 김다혜 Apparatus for producing insect for treatment of organic waste

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