WO2019087952A1

WO2019087952A1 - Industrial furnace

Info

Publication number: WO2019087952A1
Application number: PCT/JP2018/039815
Authority: WO
Inventors: 雄一大野; 内田　和秀; 卓哉布施; 基紘白井; 大輔加藤; 秀和坂齊
Original assignee: 株式会社デンソー
Priority date: 2017-11-02
Filing date: 2018-10-26
Publication date: 2019-05-09
Also published as: JP2019086176A

Abstract

An industrial furnace comprising: exhaust pipes (101, 102, 103) through which passes waste heat generated in furnace equipment (100) operating year-round; a first conversion unit (200) into which the waste heat passing through the exhaust pipes is input, generating a temperature gradient and thereby generating sound waves due to thermoacoustic self-induced oscillations; connection piping (300) through which the sound waves generated in the first conversion unit pass; and a second conversion unit (400) that generates cold energy and/or electricity from the sound waves passing through the connection piping.

Description

Industrial furnace

Cross-reference to related applications

This application is based on Japanese Patent Application No. 2017-212496 filed on November 2, 2017, the contents of which are incorporated herein by reference.

The present disclosure relates to an industrial furnace that generates cold heat or electric power from waste heat generated in a year-round furnace facility.

BACKGROUND ART Conventionally, for example, Patent Document 1 proposes a cooling system that generates cold heat using exhaust heat of an exhaust source. The cold generated by the cooling system is used, for example, for air conditioning.

JP, 2016-80310, A

However, in the above-mentioned prior art, at the time when cold energy is unnecessary for air conditioning, the generation of cold energy is not necessary from the beginning. For this reason, the time when the exhaust heat of the exhaust heat source is not effectively used will occur.

In addition, waste heat is always discharged from the furnace facility in the furnace facility that operates throughout the year. Therefore, it is desirable to effectively use waste heat regardless of time.

In light of the above-mentioned point, this indication aims at providing an industrial furnace which can raise the effective use effect of waste heat regardless of time.

In order to achieve the above object, in one aspect of the present disclosure, the industrial furnace generates exhaust gas temperature passing through the exhaust pipe for passing the waste heat generated in the year-round furnace facility and generates a temperature gradient through the exhaust pipe. The first conversion unit for generating a sound wave by thermoacoustic self-excited vibration, the connection pipe for passing the sound wave generated by the first conversion unit, and any one of cold heat and electric power from the sound wave passing through the connection pipe And a second conversion unit that generates both.

According to this, since the first conversion unit is configured to generate a sound wave by thermoacoustic self-excited vibration from waste heat of the exhaust pipe, cold heat or electric power can be generated from the waste heat throughout the year. Therefore, in an industrial furnace equipped with an exhaust pipe, the effective utilization effect of waste heat can be enhanced regardless of the time.

The above object and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the attached drawings. The drawing is
It is a figure showing an industrial furnace concerning a 1st embodiment. It is a figure showing an industrial furnace concerning a 2nd embodiment. It is a figure showing an industrial furnace concerning a 3rd embodiment. It is a figure showing the modification concerning a 3rd embodiment. It is a figure showing the modification concerning a 3rd embodiment. It is a figure showing the modification concerning a 3rd embodiment. It is a figure showing an industrial furnace concerning a 4th embodiment. It is a figure showing an industrial furnace concerning a 5th embodiment. It is a figure showing an industrial furnace concerning a 6th embodiment.

Hereinafter, a plurality of embodiments will be described based on the drawings. In the following embodiments, parts identical or equivalent to each other are denoted by the same reference numerals in the drawings.
First Embodiment
Hereinafter, a first embodiment will be described with reference to the drawings. The industrial furnace according to the present embodiment is a facility equipped with furnace equipment for heating in the process of manufacturing a product.

As shown in FIG. 1, the industrial furnace 1 includes a furnace facility 100,

exhaust pipes

101, 102, 103, a first conversion unit 200, a connection pipe 300, and a second conversion unit 400.

The furnace facility 100 is an industrial facility that operates year-round. The furnace facility 100 is configured as a facility that brazes a heat exchanger, for example.

The furnace facility 100 includes a degreasing facility 104, a binder removal facility 105, air-

breaking facilities

106 and 107, a brazing facility 108, a cooling cooler 109, and a cooling facility 110. Each of the facilities 104 to 110 is a general facility for performing brazing. Each facility 104-110 is configured to complete brazing of each part while introducing and moving the product. Each of the facilities 104 to 110 is equipped with a facility for heating according to the process.

For example, among the facilities 104 to 110, exhaust pipes 101 to 103 are connected to the degreasing facility 104, the binder removal facility 105, and the air-breaking facility 107, respectively, through which waste heat generated in the product manufacturing process is passed. The waste heat is discharged from the industrial furnace 1 in a state of being contained in gas or liquid. For example, the heated gas is released to the atmosphere. The exhaust pipes 101 to 103 always discharge waste heat, for example, around 300 ° C. Of course, waste heat of different temperatures may be discharged to the exhaust pipes 101 to 103, respectively.

In the present embodiment, the first conversion unit 200, the connection pipe 300, and the second conversion unit 400 constitute a thermoacoustic engine. In the present embodiment, the first conversion unit 200, the connection pipe 300, and the second conversion unit 400 constitute a thermoacoustic refrigerator. The first conversion unit 200 is an apparatus to which waste heat energy is input from the outside. The second conversion unit 400 is a device that outputs cold energy to the outside.

The first conversion unit 200 receives waste heat passing through the

exhaust pipes

101, 102, and 103 of the furnace facility 100 to generate a temperature gradient, thereby generating a sound wave by thermoacoustic self-excited vibration. That is, the first conversion unit 200 has a function of converting waste heat into sound waves. In the present embodiment, the waste heat of the exhaust pipe 101 connected to the degreasing facility 104 is used.

The first conversion unit 200 includes an output loop pipe 201 and a motor 202. The output loop pipe 201 is an annular pipe that is connected to the connection pipe 300 and outputs the generated sound wave to the connection pipe 300.

The prime mover 202 can convert waste heat into sound waves. The prime mover 202 includes a high temperature side heat exchanger 203, a heat accumulator 204, and a low temperature side heat exchanger 205.

The prime mover 202 is disposed in the middle of the output loop pipe 201 along the longitudinal direction. The heat accumulator 204 is sandwiched between the high temperature side heat exchanger 203 and the low temperature side heat exchanger 205. That is, the high temperature side heat exchanger 203 is connected to one end side of the heat accumulator 204, and the low temperature side heat exchanger 205 is connected to the other end side of the heat accumulator 204.

The high temperature side heat exchanger 203 is connected to the exhaust pipe 101 installed in the degreasing facility 104 of the furnace facility 100. Thereby, the high temperature side heat exchanger 403 inputs waste heat passing through the exhaust pipe 101.

The heat storage unit 204 generates a temperature gradient. The heat accumulator 204 is formed with a large number of flow channels having a diameter equal to or less than the temperature boundary layer thickness. As the heat storage unit 204, for example, a structure provided with fine flow paths such as a ceramic honeycomb, or a structure obtained by laminating fine metal mesh such as a stainless steel mesh can be used.

The low temperature side heat exchanger 205 is configured to maintain the low temperature by heat dissipation naturally or by circulating cooling water.

The connection pipe 300 is a pipe for transmitting the sound wave generated by the first conversion unit 200 to the second conversion unit 400. Since the connection piping 300 can be arbitrarily configured in length, shape, and the like, the degree of freedom in layout when the first conversion unit 200 and the second conversion unit 400 are installed in the furnace facility 100 can be enhanced.

The second conversion unit 400 generates cold from the sound wave passing through the connection pipe 300. That is, the second conversion unit 400 has a function of converting sound waves into cold energy.

The second conversion unit 400 includes an input loop pipe 401 and a refrigerator 402. The input loop pipe 401 is an annular pipe that is connected to the connection pipe 300 and that inputs sound waves from the connection pipe 300.

The refrigerator 402 can convert the sound waves input through the

pipes

201, 300, and 401 into cold energy. The refrigerator 402 includes a high temperature side heat exchanger 403, a heat accumulator 404, and a low temperature side heat exchanger 405.

The high temperature side heat exchanger 403, the heat accumulator 404, and the low temperature side heat exchanger 405 are disposed along the longitudinal direction in the middle of the input loop piping 401. The high temperature side heat exchanger 403 is connected to one end side of the heat accumulator 404, and the low temperature side heat exchanger 405 is connected to the other end side of the heat accumulator 404.

The configuration of the heat storage unit 404 is the same as the heat storage unit 204 of the first conversion unit 200. The high temperature side heat exchanger 403 and the low temperature side heat exchanger 405 are configured to maintain a predetermined temperature by natural heat dissipation or by circulating cooling water.

The output loop piping 201, the connection piping 300, and the input loop piping 401 constitute a sealed space. For example, a cylindrical stainless steel pipe can be used as each of the

pipes

201, 300, and 401.

In addition, each of the

pipes

201, 300, 401 encloses the working fluid in the internal space. Each of the

pipes

201, 300, 401 can transmit acoustic energy of a sound wave via the working fluid. As the working fluid, one or more types of gas or a mixture of gas and a liquid such as water can be used. As the gas, for example, low molecular weight inert gas such as helium, nitrogen, argon or the like or air can be used.

The connection pipe 300 constitutes a resonance pipe. That is, the thermoacoustic refrigerator is configured as a double loop type in which the output loop piping 201 for the thermoacoustic engine and the input loop piping 401 for the thermoacoustic refrigerator are connected by the connection piping 300. The above is the configuration of the industrial furnace 1.

Next, utilization of waste heat in the industrial furnace 1 will be described. As mentioned above, the furnace installation 100 of the industrial furnace 1 operates year-round. Along with this, waste heat is always discharged from the exhaust pipe 101. That is, waste heat is constantly input to the high temperature side heat exchanger 203 of the first conversion unit 200. Thereby, a temperature gradient is formed in the heat storage unit 204 connected to the high temperature side heat exchanger 203.

In the heat accumulator 204, a temperature gradient is formed in the flow direction of the working fluid, whereby compression, heating, expansion, and cooling of the working fluid present inside are performed, and sound waves that are thermoacoustic self-excited vibrations are generated. That is, in the heat accumulator 204, conversion from waste heat to sound waves is performed.

The sound wave generated by the first conversion unit 200 is transmitted from the output loop piping 201 to the input loop piping 401 of the second conversion unit 400 via the connection piping 300.

In the heat storage unit 404 of the second conversion unit 400, the sound waves generated by the first conversion unit 200 are transmitted to generate a temperature gradient at both ends. In the heat accumulator 404, the low temperature side heat exchange 405 side is lower in temperature than the high temperature side heat exchanger 403 side. Thereby, in the thermal storage device 404, conversion from sound waves to heat is performed. That is, cold is generated.

As long as the waste heat input to the first conversion unit 200 is not stopped, throughout the year, the refrigerator 402 generates a temperature gradient by generating a temperature gradient by inputting an acoustic wave passing through the input loop piping 401. As described above, since cold heat can be generated from waste heat, cold heat can be effectively used for cooling and cooling processes and the like.

As described above, the first conversion unit 200 installed in the industrial furnace 1 is configured to generate a sound wave from thermoacoustic self-excited vibration from the waste heat of the exhaust pipe 101. Thereby, cold heat can be generated from waste heat throughout the year. That is, the thermoacoustic refrigerator can be driven by the waste heat discharged to the outside. Therefore, in the industrial furnace provided with the exhaust pipe 101, the effective utilization effect of the waste heat can be enhanced regardless of the time.
Second Embodiment
In this embodiment, parts different from the first embodiment will be described. As shown in FIG. 2, the second conversion unit 400 is configured as a generator 406. The generator 406 is connected to the end of the connection pipe 300.

Further, the generator 406 is configured to receive a sound wave from the connection pipe 300 and generate power from the vibration of the sound wave. In the present embodiment, the first conversion unit 200, the connection pipe 300, and the generator 406 constitute a thermoacoustic generator.

As the generator 406, a linear type that converts an oscillating flow of sound waves to an electromotive force of a coil or an impulse turbine type that converts an oscillating flow of sound waves to a rotational force in one direction can be used.

With the above configuration, since power can be generated from waste heat, waste heat can be effectively used as electricity in each facility of the industrial furnace 1.
Third Embodiment
In this embodiment, parts different from the first and second embodiments will be described. As shown in FIG. 3, the second conversion unit 400 is configured to include both the refrigerator 402 and the generator 406.

The generator 406 is disposed in the middle of the connection pipe 300. For example, the generator 406 includes piping through which the sound wave passes, a vibrator that can vibrate in the sound wave transmission direction, and a coil disposed around the vibrator. Thereby, the generator 406 generates an electric power by inputting a sound wave from the connection pipe 300 and vibrating the vibrator. Although a part of the energy of the sound wave is converted into the vibration of the vibrator, a part of the sound wave that does not contribute to the vibration of the vibrator passes through the generator 406.

The refrigerator 402 is disposed in the middle of the input loop pipe 401. Therefore, the refrigerator 402 receives an acoustic wave passing through the input loop pipe 401 to generate cold heat.

According to the above configuration, the generator 406 generates electric power from part of the sound wave passing through the connection pipe 300, and the refrigerator 402 generates cold from the sound wave not converted to electric power by the generator 406. In this way, both cold energy and electric power can be generated from waste heat. In addition, cold heat and power can be used properly according to the demand for use. That is, the amount of power to be generated and the amount of cold energy can be made variable.

As a first modification, as shown in FIG. 4, the generator 406 may be disposed in the middle of the input loop piping 401. In this configuration, the generator 406 generates power from the sound waves passing through the input loop tubing 401. The refrigerator 402 generates cold from the sound waves that do not contribute to the power generation of the generator 406 among the sound waves passing through the input loop piping 401.

As a second modification, as shown in FIG. 5, the generator 406 may be disposed in the middle of the output loop pipe 201. In this configuration, the generator 406 generates power from the sound waves passing through the output loop tubing 201. Among the sound waves, sound waves that do not contribute to the power generation of the generator 406 are input to the refrigerator 402 via the connection pipe 300 and the input loop pipe 401.

As a 3rd modification, as shown in Drawing 6, connection piping 300 contains branching part 301 which branched from the connection piping 300 concerned. The generator 406 is connected to the end of the branch unit 301. Thus, the generator 406 generates power from the sound wave passing through the branch portion 301.
Fourth Embodiment
In this embodiment, parts different from the first to third embodiments will be described. As shown in FIG. 7, the furnace equipment 100 includes a ventilation pipe 111 connected to the cooling equipment 110 and a blower 112 disposed in the ventilation pipe 111. The cooling facility 110 is a facility for performing a cooling process for cooling a product in the manufacturing process.

The first conversion unit 200 includes a plurality of prime movers 202. In the present embodiment, the first conversion unit 200 includes three prime movers 202 corresponding to the three exhaust pipes 101 to 103, respectively. Each high temperature side heat exchanger 203 of each motor 202 is connected to each exhaust pipe 101-103.

Further, the three prime movers 202 are connected in series by being disposed in the middle of the input loop piping 401. According to this, since each prime mover 202 oscillates at a low temperature, it is possible to increase the amount of heat input when the temperature of the waste heat is high. Specifically, the heat amount corresponding to the temperature difference between the temperature of the waste heat and the operating temperature of the prime mover 202 is input from the high temperature side heat exchangers 203 of the prime movers 202 to the thermoacoustic engine. Since the operating temperature of each motor 202 can be lowered by connecting the plurality of motors 202 in series, the amount of heat input to the thermoacoustic device can be increased. As a result, there is an advantage that cold energy and electric energy can be increased.

The refrigerator 402 of the second conversion unit 400 is connected to the vent pipe 111 of the cooling device 110. Specifically, the low temperature side heat exchanger 405 of the refrigerator 402 is connected so as to be able to exchange heat with the gas passing through the vent pipe 111. For example, the low temperature side heat exchanger 405 is configured such that the gas passing through the vent pipe 111 can exchange heat with the fins. Thereby, the gas passing through the ventilation pipe 111 can be cooled to the outside air temperature or less.

According to the above configuration, cold air can be generated from the cold generated by the refrigerator 402. The cold air is blown to the cooling equipment 110 by the blower 112 in the ventilation pipe 111. Therefore, the cooling efficiency of the cooling facility 110 can be improved, and the cooling process can be shortened. In addition, since the equipment for producing cold air is not necessary, the cooling equipment 110 can be miniaturized. Furthermore, since a part of the cooling power of the cooling equipment 110 can be compensated by the cold air passing through the aeration pipe 111, there is an advantage that the cooling power of the cooling equipment 110 can be reduced.
Fifth Embodiment
In this embodiment, parts different from the first to fourth embodiments will be described. As shown in FIG. 8, the furnace installation 100 includes a private room 500. The private room 500 is a space surrounded by walls, such as a meeting room, for example.

The low temperature side heat exchanger 405 of the refrigerator 402 of the second conversion unit 400 is configured to be able to supply cold to the individual chamber 500. Of course, the temperature of the cold air, the blowing direction of the cold air, the volume of the cold air so that the cold generated by the low temperature side heat exchanger 405 is not supplied directly to the room 500 but is supplied to the room 500 as cold air for air conditioning. Adjustment of etc. is possible.

With the above configuration, cold heat can be used for air conditioning of the individual room 500. For this reason, the air-conditioning motive power of the furnace installation 100 can be reduced.
Sixth Embodiment
In this embodiment, parts different from the first to fifth embodiments will be described. As shown in FIG. 9, the furnace installation 100 includes a heater 113 for heating. The heater 113 is one of the equipment for performing heating. The heater 113 is provided, for example, in the degreasing facility 104 and the binder removal facility 105.

The generator 406 also includes an electric wire 407 connected to the heater 113. Therefore, the generator 406 heats the heater 113 by supplying power to the heater 113 via the electric wire 407.

According to the above configuration, since the heater 113 can be heated by the power generated from the waste heat, the operating power of the furnace facility 100 can be reduced.

The configuration of the industrial furnace 1 shown in each of the above embodiments is an example, and is not limited to the configuration described above, and may be another configuration that can realize the present disclosure. The modification of the said embodiment is described. For example, the industrial furnace 1 may be any facility provided with the exhaust pipes 101 to 103, and the furnace facility 100 may be configured as a facility other than the brazing apparatus.

Furthermore, a configuration in which a plurality of prime movers 202 are connected in series may be applied to the first to third and sixth embodiments. Furthermore, the output loop piping 201 may be connected in parallel to the connection piping 300, and the motor 202 may be provided in each output loop piping 201. Similarly, the input loop piping 401 may be connected in parallel to the connection piping 300, and the refrigerator 402 may be provided in each input loop piping 401. That is, the motor 202 and the refrigerator 402 may be provided in parallel. In this case, the generator 406 may be provided in all the output loop piping 201 and the input loop piping 401, or may be provided in a specific output loop piping 201 or the input loop piping 401. Since the refrigerator 402 and the generator 406 can be installed in each of the exhaust pipes 101 to 103, there is an advantage that the degree of freedom in installing the thermoacoustic engine in the furnace facility 100 is increased.

The above embodiments can be implemented in combination as appropriate. For example, the fourth to fifth embodiments can be combined with the third embodiment. Further, the fourth to sixth embodiments may be combined with each other. In this case, the generator 406 may be provided in the middle of the connection piping 300 in the fourth and fifth embodiments, or the generator 406 may be provided in the output loop piping 201 and the input loop piping 401 as in the third embodiment. Also good. When combining the fourth embodiment and the fifth embodiment, the input loop piping 401 may be configured in parallel, or one low temperature side heat exchanger 405 may be connected to both the trachea 111 and the individual chamber 500 through Also good.

Although the present disclosure has been described based on the examples, it is understood that the present disclosure is not limited to the examples and structures. The present disclosure also includes various modifications and variations within the equivalent range. In addition, various combinations and forms, and further, other combinations and forms including only one element, or more or less than these elements are also within the scope and the scope of the present disclosure.

Claims

Exhaust pipes (101, 102, 103) for passing waste heat generated in the year-round furnace equipment (100);
A first conversion unit (200) for generating a sound wave by thermoacoustic self-oscillation by generating the temperature gradient by inputting the waste heat passing through the exhaust pipe;
A connection pipe (300) for passing the sound wave generated by the first conversion unit;
A second conversion unit (400) generating cold heat and / or electric power from the sound wave passing through the connection pipe;
Industrial furnace equipped with.
The second conversion unit is
An annular input loop pipe (401) for inputting the sound wave from the connection pipe;
A refrigerator (402) disposed in the middle of the input loop piping and generating the cold heat by generating the temperature gradient by inputting the sound wave passing through the input loop piping;
The industrial furnace according to claim 1, comprising
The industrial furnace according to claim 1, wherein the second conversion unit is configured as a generator (406) which receives the sound wave from the connection pipe and generates the electric power from the vibration of the sound wave.
The second conversion unit is
A generator (406) for generating the electric power from the vibration of the sound wave by inputting the sound wave;
A refrigerator (402) for generating the cold energy by generating the temperature gradient by inputting the sound wave;
The industrial furnace according to claim 1, comprising
The second conversion unit includes an annular input loop pipe (401) for inputting the sound wave from the connection pipe,
The generator is disposed in the middle of the connection pipe and generates the electric power from the sound wave passing through the connection pipe.
5. The industrial furnace according to claim 4, wherein the refrigerator is disposed in the middle of the input loop piping and generates the cold heat by inputting the sound wave passing through the input loop piping.
The second conversion unit includes an annular input loop pipe (401) for inputting the sound wave from the connection pipe,
The generator is disposed in the middle of the input loop piping and generates the electric power from the sound wave passing through the input loop piping.
The industrial furnace according to claim 4, wherein the refrigerator is disposed in the middle of the input loop piping and generates the cold heat from the sound wave passing through the input loop piping.
The first conversion unit includes an annular output loop pipe (201) that outputs the sound wave to the connection pipe,
The second conversion unit includes an annular input loop pipe (401) for inputting the sound wave from the connection pipe,
The generator is disposed in the middle of the output loop piping and generates the electric power from the sound wave passing through the output loop piping.
5. The industrial furnace according to claim 4, wherein the refrigerator is disposed in the middle of the input loop piping and generates the cold heat by inputting the sound wave passing through the input loop piping.
The connection pipe includes a branch portion (301) branched from the connection pipe,
The second conversion unit includes an annular input loop pipe (401) for inputting the sound wave from the connection pipe,
The generator is connected to an end of the branch and generates the power from the sound wave passing through the branch;
5. The industrial furnace according to claim 4, wherein the refrigerator is disposed in the middle of the input loop piping and generates the cold heat by inputting the sound wave passing through the input loop piping.
The furnace facility includes a cooling facility (110) for cooling a product in the process of manufacture, and a vent pipe (111) connected to the cooling facility;
The second conversion unit is disposed in the middle of the input loop pipe and an annular input loop pipe (401) for inputting the sound wave from the connection pipe, and receives the sound wave passing through the input loop pipe and receives a temperature gradient And a refrigerator (402) for generating the cold energy by generating
The refrigerator includes a high temperature side heat exchanger (403) for inputting the sound wave, a low temperature side heat exchanger (405) for generating the cold heat, the high temperature side heat exchanger and the low temperature side heat exchanger. A heat accumulator (404) which is sandwiched and generates a temperature gradient,
The industrial furnace according to any one of claims 1, 2, 4 to 8, wherein the low temperature side heat exchanger is connected so as to exchange heat with the gas passing through the vent pipe.
The furnace installation includes a private room (500),
The second conversion unit is disposed in the middle of the input loop pipe and an annular input loop pipe (401) for inputting the sound wave from the connection pipe, and receives the sound wave passing through the input loop pipe and receives a temperature gradient And a refrigerator (402) for generating the cold energy by generating
The refrigerator includes a high temperature side heat exchanger (403) for inputting the sound wave, a low temperature side heat exchanger (405) for generating the cold heat, the high temperature side heat exchanger and the low temperature side heat exchanger. A heat accumulator (404) which is sandwiched and generates a temperature gradient,
The industrial furnace according to any one of claims 1, 2, 4 to 9, wherein the low temperature side heat exchanger is configured to be able to supply the cold heat to the individual chamber.
The furnace facility includes a heater (113) for heating,
The generator according to any one of claims 3 to 8, wherein the generator includes a wire (407) connected to the heater, and the heater is heated by supplying the electric power through the wire. Industrial furnace described.