JP4019131B2 - Heat exchanger for chemical heat pump reactor - Google Patents

Heat exchanger for chemical heat pump reactor Download PDF

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Publication number
JP4019131B2
JP4019131B2 JP35581297A JP35581297A JP4019131B2 JP 4019131 B2 JP4019131 B2 JP 4019131B2 JP 35581297 A JP35581297 A JP 35581297A JP 35581297 A JP35581297 A JP 35581297A JP 4019131 B2 JP4019131 B2 JP 4019131B2
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Japan
Prior art keywords
heat
tray
heat exchanger
reactor
cao
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JPH11182968A (en
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裕直 小倉
靖 金丸
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Kyushu Institute of Technology NUC
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Kyushu Institute of Technology NUC
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Description

【０００１】
【発明の属する技術分野】
本発明は、ケミカルヒートポンプの熱交換器に関するものである。
【０００２】
【従来の技術】
図３はＣａＯ／Ｃａ(ＯＨ)2系ケミカルヒートポンプの概念図である。図示のように、ケミカルヒートポンプは、反応器１、蒸発・凝縮器２と両者を結ぶパイプ３及びパイプ３の中途に設けられた接続バルブ４により構成され、反応器１には蓄熱材としてＣａＯ粒子が充填され、蒸発・凝縮器２には反応器内のＣａＯ粒子と反応するに見合う量のＨ2Ｏが充填され、真空に保たれている。反応器１にはヒータ５と熱交換パイプ６を備えた熱交換器８が設けられ、また蒸発・凝縮器２には熱交換パイプ７を備えた熱交換器９が設けられている。
図３(ａ)に示す放熱過程では、接続バルブ４を開けると圧力差により、蒸発・凝縮器２中の水が水蒸気となりパイプ３を通って反応器１へ移動し、反応器１中のＣａＯ粒子と水和反応し、Ｃａ(ＯＨ)2が形成され、高温熱が生成され、蒸発・凝縮器２では水が蒸発潜熱を失うことにより、冷熱が生成される。
次に、図３(ｂ)に示す蓄熱過程では、反応器１に熱交換器８のヒータ５により熱を加えると、放熱過程でＣａＯとＨ2Ｏとが反応して生成されたＣａ(ＯＨ)2が脱水されてＣａＯが再生されると共に、発生した水蒸気は圧力差によりパイプ３を通って蒸発・凝縮器２へ移動し、冷却することによって凝縮され水となつて溜まり、再び温・冷熱生成前の状態に戻る。
以上のように、ＣａＯ／Ｃａ(ＯＨ)2系ケミカルヒートポンプは、Ｃａ(ＯＨ)2をＣａＯとＨ2Ｏとに戻す反応とＣａＯとＨ2ＯとによりＣａ(ＯＨ)2を生成する水和反応との可逆反応を利用するものである。
【０００３】
【発明が解決しようとする課題】
従来のＣａＯ／Ｃａ(ＯＨ)2系ケミカルヒートポンプにおいては、ＣａＯとＨ2Ｏが反応する際の温熱・冷熱の生成については、これまで確認されてきており、熱取り出しのための熱交換器についても数種類開発されている。
図４は従来の熱交換器の１例を示すものであり、(ａ)は縦断面図、(ｂ)は平面図である。熱交換器８にはＣａＯ粒子充填層Ａがあり、内部に、加熱用ヒータ５と熱交換パイプ６がコイル状に設けられている。
しかし、この熱交換器の構造では、熱交換パイプ６の熱交換効率を上げるためにコイル長を長くしなければならず、製造も手間がかかり、生成熱量が少なく、放熱時の熱取り出し及び蓄熱時の加熱を行う際に効率が悪く、粒子の充填方法等を改善する必要があった。
そこで本発明は、ＣａＯ／Ｃａ(ＯＨ)2系ケミカルヒートポンプにおける生成熱量の増大及び熱交換効率の向上を図ることを目的とするものである。
【０００４】
【課題を解決するための手段】
前記課題を解決するため、本発明のケミカルヒートポンプの反応用熱交換器は、中心を通る面で少なくとも２分割可能な円板状のトレイを多段に配置し、前記トレイの中心部に形成した凹部に熱交換用パイプを通し、前記トレイの外周部に形成した複数の凹部にヒータを配設し、前記トレイに熱交換用媒体を充填したものである。
前記トレイ内部には、熱効率を上げるために放射状のフィンを設けることが好ましい。
【０００５】
【発明の実施の形態】
本発明においては、蓄・放熱性能の向上を図るためにＣａＯ粒子層内での熱・水蒸気移動を促進するようにＣａＯ粒子充填層を多段トレー型としてＣａＯ粒子を分配し、トレーにフィンを取り付けた。さらに蓄熱密度を大きくし、熱ロスを小さくするために、柱等の余分な構造物を要しない試料トレー、ヒーター、熱交換器一体型とした。また、点検及び修理、試料交換、試料設置状態変更が容易にできるようにトレーとヒータ、熱交換器を分割できるようにカートリッジタイプにした。
【０００６】
【実施例】
以下、本発明を実施例に基づいて具体的に説明する。図１は、本発明のＣａＯ／Ｃａ(ＯＨ)2系ケミカルヒートポンプ反応器用熱交換器の概略図である。
図２は、熱交換器であるトレー１段の平面図を示す。
反応器中心部は１０段の多段充填槽（多段トレー）となっている。トレー１０はステンレス板で製作され、トレー１０にはステレス製のフィン１１が１０枚放射線状に溶接され、ＣａＯ又はＣａ(ＯＨ)2粒子はこのトレー１０上に充填される。図２に示すように、トレー１０の１段は半円に分割され、取り外しが可能となっており、中心部のステンレス管よりなる熱交換パイプ６は２枚の半円トレーで挟み圧着され熱移動抵抗が軽減されている。また、トレー側面には１０本の蓄熱用ヒータ５が等間隔に圧着され、取付金具１２を用いて固定される。ヒータ５外表面がステンレス管で製作されており、ヒーター接触面がトレー側面のくぼみに埋め込まれることで接触は面接触となり、熱移動がより良好に行われる。
トレー間距離は反応媒体である水蒸気の移動、拡散を考慮し、調節可能なように可動式である。
反応器１内で生成した熱は中心部の熱交換用パイプ６にて外部へ熱回収される。Ｃａ(ＯＨ)2粒子の蓄熱の際にはトレー１０自体が伝熱フィンとして機能し、ヒータ５から供給される熱がより均一に粒子全体に供給される。放熱の際には水和反応により生成された温熱が中心部の熱交換用パイプ６に集中されて熱回収が行われる。
なお、本実施例では、トレー１０を半円状に２分割したものを示したが、２分割に限らず、３分割以上でも、分割可能な構造であればよい。
【０００７】
【発明の効果】
以上のように本発明によれば、下記の効果を奏する。
（１）ＣａＯ／Ｃａ(ＯＨ)2系ケミカルヒートポンプにおいて、多段トレー方式にすることで粒子と水蒸気との接触面積が大きくなり、トレー１段の層高が小さくなるため、粒子層内での熱・物質移動が容易になり、反応が促進される。
（２）試料トレー全体が伝熱促進体となっているため、蓄・放熱時の熱移動が良好であり、特にフィンを取り付けることで、半径方向への１次元的な流れから、円周方向への熱移動が加わりより均一な熱移動が可能となる。
（３）ヒーター及び熱交換器が試料トレーと一体型の構造体のため、支柱を設置する必要がなく、支柱から反応器本体への熱損失が小さくなると共に、蓄熱密度が大きくとれる。
（４）一段のトレーを分割式にすることで、取り外しが可能となる。
【図面の簡単な説明】
【図１】 本発明のＣａＯ／Ｃａ(ＯＨ)2系ケミカルヒートポンプ反応器用熱交換器の概略図である。
【図２】 本発明実施例のトレー１段の分解平面図である。
【図３】 ＣａＯ／Ｃａ(ＯＨ)2系ケミカルヒートポンプの概念図である。
【図４】 従来の熱交換器の１例を示す縦断面図及び平面図である。
【符号の説明】
１ 反応器、２ 蒸発・凝縮器、３ パイプ、４ 接続バルブ、５ ヒータ、６，７ 熱交換パイプ、８，９ 熱交換器、１０ トレー、１１ フィン、１２ 取付金具、Ａ 粒子充填層[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger of a chemical heat pump.
[0002]
[Prior art]
FIG. 3 is a conceptual diagram of a CaO / Ca (OH) 2 chemical heat pump. As shown in the figure, the chemical heat pump is composed of a reactor 1, an evaporator / condenser 2, a pipe 3 connecting the two, and a connection valve 4 provided in the middle of the pipe 3, and the reactor 1 has CaO particles as a heat storage material. The evaporator / condenser 2 is filled with an amount of H 2 O commensurate with the reaction with the CaO particles in the reactor and kept in a vacuum. The reactor 1 is provided with a heat exchanger 8 provided with a heater 5 and a heat exchange pipe 6, and the evaporator / condenser 2 is provided with a heat exchanger 9 provided with a heat exchange pipe 7.
In the heat dissipation process shown in FIG. 3A, when the connection valve 4 is opened, due to the pressure difference, the water in the evaporator / condenser 2 becomes water vapor and moves to the reactor 1 through the pipe 3. A hydration reaction is performed with the particles, Ca (OH) 2 is formed, high-temperature heat is generated, and in the evaporator / condenser 2, water loses latent heat of evaporation, thereby generating cold.
Next, in the heat storage process shown in FIG. 3B, when heat is applied to the reactor 1 by the heater 5 of the heat exchanger 8, Ca (OH) generated by the reaction of CaO and H 2 O in the heat release process. ) 2 is dehydrated and CaO is regenerated, and the generated water vapor moves through the pipe 3 to the evaporator / condenser 2 due to the pressure difference, condenses and accumulates as water by cooling, and again warm and cool Returns to the state before generation.
As described above, the CaO / Ca (OH) 2 chemical heat pump is a hydration that generates Ca (OH) 2 by the reaction of returning Ca (OH) 2 to CaO and H 2 O and CaO and H 2 O. It utilizes a reversible reaction with the reaction.
[0003]
[Problems to be solved by the invention]
In the conventional CaO / Ca (OH) 2 chemical heat pump, the generation of heat and cold when CaO and H 2 O react has been confirmed so far, and heat exchangers for heat extraction Several types have also been developed.
FIG. 4 shows an example of a conventional heat exchanger, in which (a) is a longitudinal sectional view and (b) is a plan view. The heat exchanger 8 includes a CaO particle packed bed A, and a heater 5 and a heat exchange pipe 6 are provided in a coil shape inside.
However, in this heat exchanger structure, in order to increase the heat exchange efficiency of the heat exchange pipe 6, the coil length must be lengthened, and the manufacturing is laborious, the amount of generated heat is small, and heat extraction and heat storage during heat radiation are performed. When heating at the time, the efficiency was poor, and it was necessary to improve the method of filling particles.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to increase the amount of generated heat and improve the heat exchange efficiency in a CaO / Ca (OH) 2 chemical heat pump.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the reaction heat exchanger of the chemical heat pump according to the present invention is a recess formed in a central portion of the tray, in which a plurality of disc-shaped trays that can be divided into at least two parts on a plane passing through the center are arranged. A heat exchange pipe is passed through, a heater is provided in a plurality of recesses formed on the outer periphery of the tray, and the tray is filled with a heat exchange medium.
Radial fins are preferably provided inside the tray in order to increase thermal efficiency.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, in order to improve the storage and heat dissipation performance, CaO particles are distributed using a CaO particle packed layer as a multi-stage tray type so as to promote heat and water vapor movement in the CaO particle layer, and fins are attached to the tray. It was. Furthermore, in order to increase the heat storage density and reduce the heat loss, a sample tray, heater, and heat exchanger integrated type that do not require extra structures such as columns. The tray, heater, and heat exchanger are divided into cartridges so that inspection, repair, sample replacement, and sample installation state change can be easily performed.
[0006]
【Example】
Hereinafter, the present invention will be specifically described based on examples. FIG. 1 is a schematic view of a heat exchanger for a CaO / Ca (OH) 2 -based chemical heat pump reactor according to the present invention.
FIG. 2 shows a plan view of one tray serving as a heat exchanger.
The central part of the reactor is a 10-stage multi-stage filling tank (multi-stage tray). The tray 10 is made of a stainless steel plate, and ten stainless steel fins 11 are radially welded to the tray 10, and CaO or Ca (OH) 2 particles are filled on the tray 10. As shown in FIG. 2, one stage of the tray 10 is divided into semicircles and can be removed. The heat exchange pipe 6 made of a stainless steel tube at the center is sandwiched between two semicircular trays and pressed to heat. Movement resistance is reduced. Further, ten heat storage heaters 5 are pressure-bonded to the side of the tray at equal intervals, and are fixed using the mounting bracket 12. The outer surface of the heater 5 is made of a stainless steel tube, and the heater contact surface is embedded in a recess on the side surface of the tray, so that the contact becomes surface contact, and heat transfer is performed better.
The distance between the trays is movable so that it can be adjusted in consideration of the movement and diffusion of water vapor as a reaction medium.
The heat generated in the reactor 1 is recovered by the heat exchange pipe 6 at the center. When the Ca (OH) 2 particles are stored, the tray 10 itself functions as a heat transfer fin, and the heat supplied from the heater 5 is more uniformly supplied to the entire particles. At the time of heat dissipation, the heat generated by the hydration reaction is concentrated on the heat exchange pipe 6 in the center, and heat recovery is performed.
In the present embodiment, the tray 10 is divided into two in a semicircular shape. However, the structure is not limited to two, and may be divided into three or more as long as the structure can be divided.
[0007]
【The invention's effect】
As described above, the present invention has the following effects.
(1) In a CaO / Ca (OH) 2 chemical heat pump, the contact area between particles and water vapor is increased by using a multi-stage tray system, and the layer height of one tray is reduced.・ Mass transfer is facilitated and the reaction is promoted.
(2) Since the entire sample tray is a heat transfer accelerator, heat transfer during heat storage and heat dissipation is good. Especially by attaching fins, a one-dimensional flow in the radial direction can be used in the circumferential direction. More uniform heat transfer becomes possible by adding heat transfer to the.
(3) Since the heater and the heat exchanger are integrated with the sample tray, there is no need to install a column, heat loss from the column to the reactor main body is reduced, and the heat storage density is increased.
(4) It becomes possible to remove the tray by dividing the tray in one stage.
[Brief description of the drawings]
FIG. 1 is a schematic view of a heat exchanger for a CaO / Ca (OH) 2 -based chemical heat pump reactor according to the present invention.
FIG. 2 is an exploded plan view of one tray of the embodiment of the present invention.
FIG. 3 is a conceptual diagram of a CaO / Ca (OH) 2 -based chemical heat pump.
FIG. 4 is a longitudinal sectional view and a plan view showing an example of a conventional heat exchanger.
[Explanation of symbols]
1 reactor, 2 evaporator / condenser, 3 pipe, 4 connection valve, 5 heater, 6, 7 heat exchange pipe, 8, 9 heat exchanger, 10 tray, 11 fin, 12 mounting bracket, A particle packed bed

Claims (2)

中心を通る面で少なくとも２分割可能な円板状のトレイを多段に配置し、前記トレイの中心部に形成した凹部に熱交換用パイプを通し、前記トレイの外周部に形成した複数の凹部にヒータを配設し、前記トレイに熱交換用媒体を充填したことを特徴とするケミカルヒートポンプの反応器用熱交換器。Disc-shaped trays that can be divided into at least two in a plane passing through the center are arranged in multiple stages, a heat exchange pipe is passed through the recess formed in the center of the tray, and a plurality of recesses formed in the outer periphery of the tray A heat exchanger for a reactor of a chemical heat pump, wherein a heater is provided and the tray is filled with a heat exchange medium. トレイ内部に、放射状のフィンを設けたことを特徴とする請求項１記載のケミカルヒートポンプの反応器用熱交換器。2. A heat exchanger for a reactor of a chemical heat pump according to claim 1, wherein radial fins are provided inside the tray.
JP35581297A 1997-12-24 1997-12-24 Heat exchanger for chemical heat pump reactor Expired - Lifetime JP4019131B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP35581297A JP4019131B2 (en) 1997-12-24 1997-12-24 Heat exchanger for chemical heat pump reactor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP35581297A JP4019131B2 (en) 1997-12-24 1997-12-24 Heat exchanger for chemical heat pump reactor

Publications (2)

Publication Number Publication Date
JPH11182968A JPH11182968A (en) 1999-07-06
JP4019131B2 true JP4019131B2 (en) 2007-12-12

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4938323B2 (en) * 2006-03-14 2012-05-23 大阪瓦斯株式会社 Method for producing heat exchange reactor
JP5796878B2 (en) * 2009-12-25 2015-10-21 荏原冷熱システム株式会社 Refrigerant adsorbent filling container, bleed air recovery device, turbo chiller and refrigerant recovery device equipped with the same
JP6037159B2 (en) 2012-07-12 2016-11-30 アイシン精機株式会社 Chemical heat storage device
JP6577415B2 (en) * 2016-06-02 2019-09-18 株式会社村田製作所 Heat exchanger and chemical heat pump having the same
JP6577414B2 (en) * 2016-06-02 2019-09-18 株式会社村田製作所 Heat exchanger and chemical heat pump having the same

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