JP2012246884A - Method of installing exhaust heat recovery system having vibration source and exhaust heat recovery facilities - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method which enables an exhaust heat recovery system to be installed without reducing heat-transfer performance of a heat exchanger even in a terribly dirty environment and damaging a wall body, and an exhaust heat recovery facilities.SOLUTION: This method of installing the exhaust heat recovery system 10 having a vibration source is the method of installing the same having the vibration source wherein the heat source-side heat exchanger 9a is attached to the wall body 20 of a gas duct or a furnace in order to recover exhaust heat in the interior of the wall body 20 by means of the heat source-side heat exchanger 9a. An opening part 21 is formed in the wall body 20. In the opening part 21, a bottomed tubular cover 30 is disposed with its bottom part 32 being in the interior of the wall body 20. The heat source-side heat exchanger 9a is disposed in the interior of the bottomed tubular cover 30. A first heat conduction body 41 in the form of a liquid, a powder or a grain is filled into a gap in the interior of the bottomed tubular cover 30 with the heat source-side heat exchanger 9a disposed therein.

Description

  The present invention relates to an installation method and an exhaust heat recovery facility for an exhaust heat recovery apparatus that recovers exhaust heat from a furnace such as a flue or a ceramic furnace.

Effective use of heat sources such as exhaust heat, biomass, and cold energy leads to the solution of environmental problems and energy problems. The Stirling engine is suitable for effective use of heat sources because it has the feature that it can be operated if there is a temperature difference regardless of the heat source.
Heat recovery from exhaust gas flowing through the flue is particularly attracting attention as waste heat utilization, but a waste heat recovery device that can effectively recover waste heat by multi-stage multiple Stirling engines has been proposed (Patent Document) 1).
In Patent Document 1, since the heat input amount is different between the Stirling engine disposed on the upstream side and the Stirling engine disposed on the downstream side, the power generation output is increased in consideration of the difference in the heat input amount.

JP 2006-118406 A

However, in many cases including an incinerator, the inside of the furnace is extremely dirty, and the heat transfer performance of the heat exchanger is significantly reduced by use due to this dirt.
In addition, in order to ensure fire resistance and heat insulation, brick materials, viscosity, mortar, and other refractory materials are often used for walls of furnaces such as ceramic furnaces. In particular, brick materials are fragile to local repetitive vibrations and may cause important problems such as ejection of high-temperature gas due to damage to the wall.

  Therefore, the present invention provides an installation method and an exhaust heat recovery facility in which an exhaust heat recovery device can be attached without deteriorating the heat transfer performance of the heat exchanger even in a heavily contaminated environment and without damaging the wall. The purpose is to provide.

According to a first aspect of the present invention, there is provided a method for installing an exhaust heat recovery apparatus having a vibration source, wherein a heat source side heat exchanger is installed on a wall of a flue or a furnace, and the exhaust heat inside the wall is transferred to the heat source. An installation method of an exhaust heat recovery apparatus having a vibration source that is recovered by a side heat exchanger, wherein an opening is formed in the wall body, a bottomed cylindrical cover is formed in the opening, and a bottom is the wall Arranged to be inside the body, the heat source side heat exchanger is arranged inside the cover, and the gap inside the cover where the heat source side heat exchanger is arranged is granular, powdery, or liquid The first heat conductor is filled.
According to a second aspect of the present invention, in the installation method of the exhaust heat recovery apparatus having the vibration source according to the first aspect, a second gap is formed by filling a gap with the cover on the inner side of the wall body of the opening portion. A heat conductor is provided.
According to a third aspect of the present invention, in the installation method of the exhaust heat recovery apparatus having the vibration source according to the first or second aspect, a gap between the opening and the cover is provided outside the wall body. A heat insulating material for filling is provided.
According to a fourth aspect of the present invention, in the installation method of the exhaust heat recovery apparatus having the vibration source according to any one of the first to third aspects, a center axis of the cover is arranged outside the wall body. The cover is arranged to be higher than the inside.
According to a fifth aspect of the present invention, there is provided the exhaust heat recovery apparatus having the vibration source according to any one of the first to fourth aspects, wherein the first heat conductor is granular or powdery graphite. It is characterized by using a material.
According to a sixth aspect of the present invention, there is provided the exhaust heat recovery apparatus having the vibration source according to any one of the first to fifth aspects, wherein the second heat conductor is a thermosetting mortar / gas. An adhesive material such as hard mortar and water glass is used.
According to a seventh aspect of the present invention, in the installation method of the exhaust heat recovery apparatus having the vibration source according to any one of the first to sixth aspects, the cover includes a silicon carbide material, aluminum phosphate, or phosphoric acid. An oxidation resistant material such as magnesium, or graphite coated with the oxidation resistant material, carbon steel for boiler / heat exchanger, stainless steel, aluminum, or copper is used.
An exhaust heat recovery facility of the present invention according to claim 8 is an exhaust heat recovery facility installed by the installation method of the exhaust heat recovery device having the vibration source according to any one of claims 1 to 7, wherein As a waste heat recovery device, a Stirling engine is used to store or feed power from waste heat inside the wall.

According to the present invention, the heat source side heat exchanger is disposed inside the cover, and the heat source side heat exchanger is not directly exposed to the wall, so that the heat transfer performance of the heat source side heat exchanger is lowered even in a heavily contaminated environment. I will not let you.
Moreover, according to this invention, the vibration which generate | occur | produces in an exhaust heat recovery apparatus is absorbed by the 1st heat conductor, and is not transmitted to a cover. Therefore, the vibration is not transmitted to the wall body, and the wall body is not damaged by the vibration generated in the exhaust heat recovery device.

Sectional drawing which shows the installation state of the exhaust heat recovery apparatus by one Example of this invention Sectional drawing which shows the installation state of the waste heat recovery apparatus by other Example of this invention.

  An installation method of an exhaust heat recovery apparatus having a vibration source according to a first embodiment of the present invention includes forming an opening in a wall, a bottomed cylindrical cover at the opening, and a bottom inside the wall. The heat source side heat exchanger is disposed inside the cover, and the granular, powdery, or liquid first heat conductor is disposed in the gap inside the cover where the heat source side heat exchanger is disposed. Is to be filled. According to the present embodiment, the heat source side heat exchanger is arranged inside the cover, and the heat source side heat exchanger is not directly exposed in the wall, so that the heat transfer performance of the heat source side heat exchanger even in a heavily contaminated environment Is not reduced. Further, the vibration generated in the exhaust heat recovery device is absorbed by the first heat conductor and is not transmitted to the cover. Therefore, the vibration is not transmitted to the wall body, and the wall body is not damaged by the vibration generated in the exhaust heat recovery device.

  According to a second embodiment of the present invention, in the installation method of the exhaust heat recovery apparatus having the vibration source according to the first embodiment, a second gap that fills a gap with the cover on the inner side of the wall of the opening portion is provided. A heat conductor is provided. According to the present embodiment, since the cover does not vibrate according to the first embodiment, the space between the cover and the wall body can be filled with the second heat conductor between the cover and the wall body. By burying, high-temperature exhaust heat on the inner side of the wall can be transmitted to the cover. Furthermore, by providing this second heat conductor on the inside of the wall of the opening portion, it is not affected by the low temperature on the outside of the wall, so the high temperature exhaust heat on the inside of the wall is effective for the cover. Can be communicated to.

  According to a third embodiment of the present invention, in the installation method of the exhaust heat recovery apparatus having the vibration source according to the first or second embodiment, a gap with the cover is filled on the outer side of the wall of the opening portion. A heat insulating material is provided. According to the present embodiment, by providing the heat insulating material on the outer side of the wall of the opening portion, the high-temperature exhaust heat on the inner side of the wall can be effectively transmitted to the cover.

  According to a fourth embodiment of the present invention, in the installation method of the exhaust heat recovery apparatus having the vibration source according to the first to third embodiments, the center axis of the cover is set so that the outside of the wall body is more than the inside of the wall body. The cover is placed at a high level. According to the present embodiment, it is possible to prevent the first thermal conductor filling the gap inside the cover from flowing out of the cover due to vibration.

  According to a fifth embodiment of the present invention, in the installation method of the exhaust heat recovery apparatus having the vibration source according to the first to fourth embodiments, a granular or powdery graphite material is used as the first heat conductor. It is what is used. According to the present embodiment, it can withstand exhaust heat of about 400 degrees, and can be easily replenished at regular intervals even if the graphite material disappears due to oxidation in an oxygen atmosphere. It can be effectively transferred to the heat exchanger. Further, in an oxygen-free atmosphere such as a semiconductor manufacturing apparatus, heat can be efficiently taken into the heat source side heat exchanger even in an ultrahigh temperature state.

  According to a sixth embodiment of the present invention, in the installation method of the exhaust heat recovery apparatus having the vibration source according to the first to fifth embodiments, as the second heat conductor, a thermosetting mortar and an air-hardening mortar In addition, an adhesive such as water glass is used. According to the present embodiment, the cover can be fixed to the wall body, and the exhaust heat of the wall body can be effectively transmitted to the heat source side heat exchanger.

  In the seventh embodiment of the present invention, in the installation method of the exhaust heat recovery apparatus having the vibration source according to the first to sixth embodiments, as a cover, silicon carbide material, aluminum phosphate, magnesium phosphate, etc. Or graphite coated with the oxidation resistant material, carbon steel for boiler / heat exchanger, stainless steel, aluminum, or copper. Further, in an oxygen-free atmosphere such as a semiconductor manufacturing apparatus, heat can be efficiently taken into the heat source side heat exchanger even in an ultrahigh temperature state. In the installation method of the exhaust heat recovery apparatus having the vibration source according to the first to sixth embodiments, by using carbon steel or stainless steel for boiler / heat exchanger as the cover, even in a corrosive atmosphere used in boilers, etc. With an inexpensive cover material, heat can be effectively taken into the heat source side heat exchanger. According to the present embodiment, the exhaust heat exceeding 400 degrees can be endured, and the exhaust heat can be effectively transmitted to the heat source side heat exchanger.

  The exhaust heat recovery facility according to the eighth embodiment of the present invention uses a Stirling engine as the exhaust heat recovery device in the installation method of the exhaust heat recovery device having the vibration source according to the first to seventh embodiments. Electric power is stored or supplied from the exhaust heat inside the wall. According to the present embodiment, the exhaust heat can be effectively used as electric power without giving the wall the influence of slight vibration in the Stirling engine.

Hereinafter, a method for installing an exhaust heat recovery apparatus having a vibration source according to an embodiment of the present invention will be described.
FIG. 1 is a cross-sectional view showing an installed state of the exhaust heat recovery apparatus according to the present embodiment.
The Stirling engine used in the exhaust heat recovery apparatus 10 of the present embodiment has a displacer piston 1 and a power piston 2, and one space separated by the displacer piston 1 is a high temperature space 3, and the other space is a low temperature space 4. The working gas is moved between the high temperature space 3 and the low temperature space 4. Here, the displacer piston 1 and the power piston 2 serve as vibration sources of the exhaust heat recovery device 10.

The heating unit (heat source side heat exchanger) 9 a is disposed at a position facing the displacer piston 1 with the high-temperature space 3 interposed therebetween, and the regeneration unit 5 and the cooling unit 6 are disposed on the outer periphery of the displacer piston 1. Here, the heating unit 9a is constituted by a heat transfer tube that moves the high-temperature working gas.
The displacer piston 1 and the power piston 2 are connected to a crankshaft 7, and a generator shaft 8 is connected to one end of the crankshaft 7.
The regeneration unit 5 is formed in a cylindrical shape, and a heat storage material such as austenitic stainless steel or brass is provided inside the regeneration unit 5, and the heat storage material absorbs heat from the high-temperature working gas and dissipates heat to the low-temperature working gas. To do.
The cooling unit 6 is also formed in a cylindrical shape, and the inside of the cooling unit 6 is divided into a passage through which cooling water flows and a passage through which working gas flows, and the working gas is cooled by the cooling water.
The heating unit 9 a is connected to the regeneration unit 5, and the regeneration unit 5 is connected to the cooling unit 6. The heating unit 9 a communicates with the high temperature space 3, and the cooling unit 6 communicates with the low temperature space 4.

In the above configuration, the working gas moves between the high temperature space 3 and the low temperature space 4 by operating the displacer piston 1 using the generator as a power source at the start. The working gas is heated and expanded by the heating unit 9 a and introduced into the high temperature space 3, and cooled and contracted by the cooling unit 6 and introduced into the low temperature space 4, whereby pressure fluctuation occurs in the high temperature space 3 and the low temperature space 4. Arise. An output can be obtained by operating the power piston 2 by this pressure fluctuation.
That is, when heated by the heating unit 9a, the sealed working gas expands and receives the differential pressure, thereby moving the displacer piston 1 downward. By the downward movement of the displacer piston 1, the working gas in the low temperature space 4 between the displacer piston 1 and the power piston 2 is compressed, and the power piston 2 is moved downward. Due to the downward movement of the power piston 2, the working gas passes from the upper part of the displacer piston 1 (high temperature space 3), passes through the heating part 9 a, the regeneration part 5, and the cooling part 6, and is below the displacer piston 1 (low temperature space 4). ) As the displacer piston 1 moves upward, the low temperature space 4 between the displacer piston 1 and the power piston 2 becomes low pressure, so that the power piston 2 moves upward. The working gas that has moved to the lower part of the displacer piston 1 passes through the cooling unit 6, the regeneration unit 5, and the heating unit 9 a due to the upward movement of the power piston 2, and moves to the upper part of the displacer piston 1.
In this way, the working gas reciprocates between the upper part and the lower part of the displacer piston 1 while being expanded and contracted by the heating in the heating part 9a and the cooling in the cooling part 6, thereby moving the displacer piston 1 and the power piston. 2 can be moved to generate electricity.

  The exhaust heat recovery device 10 is installed on a flue through which exhaust gas flows or a wall 20 of the furnace, and recovers the exhaust heat inside the wall 20 by the heating unit 9a. The wall body 20 is generally made of a refractory material such as a brick material, viscosity, or mortar as a refractory material, but a refractory board material or cement may be used.

Next, a method for installing the exhaust heat recovery apparatus 10 will be described.
First, the opening part 21 is formed in the wall body 20. At this time, the axis of the opening portion 21 is formed so that the outside of the wall body 20 is higher than the inside of the wall body 20.
A bottomed cylindrical cover 30 is disposed in the opening portion 21.
The cover 30 includes a cylindrical portion 31 having an outer diameter smaller than the inner diameter of the opening portion 21 and an inner diameter larger than the outer diameter of the heating portion 9a, a bottom portion 32 formed at one end of the cylindrical portion 31, and the other end of the cylindrical portion 31. And an opening 33 formed in the outer periphery. The cover 30 is made of an oxidation resistant material such as silicon carbide, aluminum phosphate, or magnesium phosphate, or graphite coated with the oxidation resistant material, carbon steel for boiler / heat exchanger, stainless steel, aluminum, or copper. .
The cover 30 is disposed such that the bottom 32 is inside the wall body 20. The cover 30 is arranged such that the center axis of the cover 30 is higher on the outside of the wall body 20 than on the inside of the wall body 20.

Although the flange 34 is brought into contact with the wall body 20, the cover 30 is arranged so that the center axis of the cover 30 is higher on the outside of the wall body 20 than on the inside of the wall body 20. A member 35 is provided in the gap. The same effect can be obtained by filling the opening 35 with a soft fibrous material such as ceramic wool.
A heating unit 9 a is disposed inside the cover 30. And the clearance inside the cover 30 which has arrange | positioned the heating part 9a is filled with the granular, powdery, or liquid 1st heat conductor 41. FIG.
The first heat conductor 41 uses a granular or powdery graphite material. Further, as the liquid first heat conductor 41, an ionic liquid (molten salt) or silicon oil having high heat conductivity is used.
A space between the cover 30 and the inner side of the wall 20 of the opening portion 21 is filled with a second heat conductor 42 as necessary.

The use state after installation of the exhaust heat recovery apparatus 10 will be described below.
The internal temperature of the wall 20 targeted by the present invention is about 300 to 600 degrees. When the temperature exceeds 600 degrees, a steam turbine can be used. However, when the Stirling engine is used as the exhaust heat recovery device 10 as in this embodiment, the exhaust heat is about 300 to 600 degrees. Can effectively utilize the exhaust heat. Note that this embodiment can also be applied to cases where the temperature exceeds 600 degrees, and is particularly applicable in an oxygen-free atmosphere.
The flue through which the exhaust gas flows and the inside of the furnace wall 20 become about 300 to 600 degrees, so that the heat from the inner wall surface of the wall 20, the cover 30 and the second heat conductor 42 is heated by the heating unit 9a. Use. The heat of the cover 30 is transmitted to the heating unit 9a by the first heat conductor 41. Further, since the inner side of the wall body 20 is heated to about 300 to 600 degrees, the high temperature heat on the inner side of the wall body 20 is transmitted to the cover 30 via the second heat conductor 42.
On the other hand, the outer side of the wall body 20 decreases to 300 degrees or less, but the temperature of the cover 30 does not decrease.

Further, the exhaust heat recovery device 10 vibrates by the operation of the displacer piston 1 and the power piston 2, but does not absorb the vibration by the granular, powdery, or liquid first heat conductor 41 and transmit it to the cover 30. Therefore, the vibration is not transmitted to the wall body 20, and the wall body 20 is not damaged by the vibration generated in the exhaust heat recovery apparatus 10.
Further, since the cover 30 does not vibrate, the space between the cover 30 and the wall body 20 can be filled with the second heat conductor 42, and high temperature exhaust heat inside the wall body 20 is transmitted to the cover 30. Can do. Further, by providing the second heat conductor 42 on the inner side of the wall body 20 of the opening portion 21, it is not affected by the low temperature on the outer side of the wall body 20. Heat can be effectively transferred to the cover 30.
Further, since the cover 30 is arranged such that the center axis is higher on the outside of the wall body 20 than on the inside of the wall body 20, the first heat conductor 41 filling the gap inside the cover 30 is vibrated. At the same time, it can be prevented from flowing out of the cover 30.

FIG. 2 is a cross-sectional view showing an installed state of the exhaust heat recovery apparatus according to another embodiment of the present invention.
The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted.
In the present embodiment, a configuration is shown in which a head cover 9b that covers the heating section 9a that is a heat transfer tube is provided. The head cover 9b may be provided as in the present embodiment, and the heating unit 9a may be configured as a heating block.

  The installation method or the exhaust heat recovery facility of the exhaust heat recovery apparatus having the vibration source of the present invention can be used as a power generation apparatus or a power apparatus that uses heat source gas such as exhaust heat or biomass.

9a Heating part 9b Head cover 10 Waste heat recovery device 20 Wall body 21 Opening part 30 Cover 32 Bottom part 41 First thermal conductor 42 Second thermal conductor

Claims (8)

This is a method for installing an exhaust heat recovery apparatus having a vibration source, in which a heat source side heat exchanger is installed on a wall of a flue or a furnace, and exhaust heat inside the wall body is recovered by the heat source side heat exchanger. And
Forming an opening in the wall,
In the opening portion, a bottomed cylindrical cover is disposed so that the bottom portion is the inside of the wall body,
The heat source side heat exchanger is disposed inside the cover,
An installation method of an exhaust heat recovery apparatus having a vibration source, wherein a gap inside the cover in which the heat source side heat exchanger is arranged is filled with a first heat conductor that is granular, powdery, or liquid. .   The installation method of the exhaust heat recovery apparatus having a vibration source according to claim 1, wherein a second heat conductor that fills a gap with the cover is provided on an inner side of the wall of the opening portion.   The installation method of the exhaust heat recovery apparatus having a vibration source according to claim 1 or 2, wherein a heat insulating material that fills a gap with the cover is provided on the outside of the wall body of the opening portion.   4. The vibration source according to claim 1, wherein the cover is arranged such that a center axis of the cover is set higher at an outside of the wall body than at an inside of the wall body. 5. Installation method of exhaust heat recovery device.   The installation method of the exhaust heat recovery apparatus having a vibration source according to any one of claims 1 to 4, wherein a granular or powdery graphite material is used as the first heat conductor.   The exhaust heat having a vibration source according to any one of claims 1 to 5, wherein an adhesive such as thermosetting mortar, air-hardening mortar, and water glass is used as the second thermal conductor. How to install the recovery device.   As the cover, an oxidation resistant material such as silicon carbide, aluminum phosphate, or magnesium phosphate, or graphite coated with the oxidation resistant material, carbon steel for boiler / heat exchanger, stainless steel, aluminum, or copper is used. The installation method of the waste heat recovery apparatus which has a vibration source in any one of Claims 1-6 characterized by these.   It is the waste heat recovery equipment installed by the installation method of the exhaust heat recovery apparatus which has a vibration source in any one of Claims 1-7, Comprising: The said wall body using a Stirling engine as said exhaust heat recovery apparatus An exhaust heat recovery facility for storing electricity or supplying power from the exhaust heat inside.