【発明の詳細な説明】〔産業上の利用分野〕本発明は、塗装ブースの排熱を効率よく回収するように
した塗装ブースの排熱回収装置に関する．〔従来の技術〕自動車等の塗装は、密閉された塗装ブース内で行なわれ
る．又、塗料の種類によっては、例えば水性塗料を使用
する場合は、塗装ブース内の温度及び湿度が塗装の良否
を左右するので、塗装ブース内は、常に適度の温度及び
湿度に保つよう，空気調整する必要がある．従来の塗装ブースの排熱回収装置を第２図に示す（特公
昭５７− ５４１８４号公報）．図において、ダクト１
内に取込まれた外気は、熱交換器２にて温度及び湿度調
整が行なわれて、塗装ブース３内に供給される．塗装ブ
ース３を出た空気の保有熱は，排熱回収用熱交換器４に
て回収され，大気中に放出される．一方回収した熱は、
加圧型のヒートポンプ５に供給され、ヒートボンプ５の
駆動用熱源として使用される．６は別に設備された加熱
源であり、ヒートポンプ５の加熱では不足する場合に熱
を補うために設けられている．なお，７は凝縮器、８は
蒸発器である．この塗装ブースの排熱回収装置は、塗装ブース３から排
出される空気の保有熱を直接排熱回収用熱交換器４で回
収するようにしたものである（以下直接排熱回収方式と
いう）．これに対して、第３図に示す従来の塗装ブースの排熱回
収装置は、熱回収液を媒体として熱回収するようにした
ものである（以下熱回収液方式という）．即ち，空調器９で温度及び湿度を調整した空気は、塗装
ブース３内に導かれる．この空気が塗装ブース３を出る
際に、回収液にて形成されるベンチュリシャワー１０を
通過し、この通過の際に熱交換が行なわれると共に空気
中の塗料ミストもベンチュリシャワー１０にて捕獲され
る．そして、ベンチュリシャワー１０で冷却（放熱）さ
れかつ塗料ミストが除去された空気は、排気ファンｌ４
にて大気中に放出され、一方受熱して昇温しかつ、塗料
ミストを含んだ回収掖は，塗料ミスト除去装置１１に導
かれる．そして、塗料ミストが除去された回収液は，と
一トボンプ５の駆動用熱源として使用された後、塗装ブ
ース３の水膜形成用樋ｌ２に戻され，水膜板１３上を流
下してベンチュリシャワー！Ｏを形成する．なお、７は
凝縮器、８は蒸発器である．〔発明が解決しようとする問題点〕上記従来の塗装ブースの排熱回収装置において、先ず直
接排熱回収方式の場合は、塗装ブースから排出される空
気中に多量の塗料粕が含まれているので、排熱回収用熱
交換器の伝熱面に塗料粕が付着し、熱交換効率が低下す
るという問題があった．その結果、十分な熱回収ができないこと、排熱回収用熱
交換器の通気抵抗が増大し、排気ファンの動力の増大を
もたらし、無駄なエネルギを消費すること、及び人手に
よって、付着した塗料粕の除去作業が必要であり、その
間装置が停止されるので稼動率が低下するという問題が
あった．又、除去された塗料粕は，そのまま廃却されて
いた．又，熱回収液を使用した方式の場合は、上記直接排熱回
収方式のような問題はないが，捕集した塗料粕は、その
まま廃却処分されていたので、熱回収は十分とは云えず
、又省資源の観点より問題があった．〔問題を解決するための手段〕上記問題を解決するために本発明は、塗装ブースの回収
液を塗料ミスト除去装置に導いて塗料ミストを除去した
後にその回収液をヒートポンプの蒸発器に導いて放熱し
塗装ブースの水膜形成用樋に導くようにした回収液循環
回路と，上記塗料ミスト除去装置にて分離した塗料粕を
燃焼炉に導いて燃焼させる塗料ミスト燃焼回路と、上記
燃焼炉の燃焼熱を利用したボイラで蒸気を発生させこの
蒸気をヒートポンプの発生器に導いてヒートポンプを駆
動するヒートポンプ用蒸気回路及び上記蒸気の一部を空
調器に導いて塗装ブースに供給し空気の温度をＷ節する
空調器用蒸気回路と、ヒートボンプの吸収器及び凝縮器
で受熱し更に上記燃焼炉の排ガス放出回路の途中に設け
たエコノマイザで受熱してボイラに導くようにしたボイ
ラ給水回路とから成ることを特徴とする．〔作用〕以上のように構成することにより、塗装ブースを出た空
気の保有熱は、回収液循環回路を通してヒートポンプの
蒸発器で放熱し、この放熱した熱は、ヒートボンプの吸
収器を介してボイラ給水に授熱する．一方，塗料粕の燃焼熱は、ボイラにて熱吸収をして蒸気
を発生させ，この蒸気によってヒートポンプを駆動し、
ヒートポンプの凝縮器を介してボイラ給水に授熱し、又
、塗料粕の燃焼排ガスの保有熱はエコノマイザを介して
ボイラ給水に授熱する．更に上記蒸気の一部を利用して
，空調器の熱源として使用する．このようにして、塗装ブースから出る空気の保有熱及び
塗料粕の燃焼熱は、効率よく回収される．〔実施例〕以下本発明の一実施例について詳細に説明する．第１図
において、３は塗装ブース．９は空調器．１０はベンチ
ュリシャワー， １２は水膜形成用樋，１３は水膜板で
あり、第３図で示したものと同一のものを同一の符号を
もって示した．１５は塗料ミスト除去装置であり、塗装
ブース３から出た回収液３Ｂの中に含まれる塗料ミスト
を除去する．そして，塗料ミストを除去した回収液は、
シャワーポンプｌ６にてヒートポンプ２２の蒸発器ｌ８
に導かれ再び塗装ブース３の水膜形成用樋１２に戻され
、ベンチュリシャワーｌＯ用の回収液として再使用する
． １７は、回収液を上記のように再使用するようにし
た回収液循環回路である．一方、塗料ミスト除去装１ｉ１５で分離した塗料粕は、
燃焼炉２５の塗料粕燃焼バーナ２Ｂで燃焼させられる．
３Ｂは塗料ミスト燃焼回路である．上記塗料ミスト除去
装置ｌ５は，例えばコンベアスクラバが使用され、連続
的に処理される．２７はボイラであり、燃焼炉２５で燃
焼した塗料粕の燃焼熱により蒸気を発生する．３３はそ
の蒸気を溜めるための蒸気ヘッダである．この蒸気へッ
ダ３３に溜められた蒸気は，ヒートボンプ２２の発生器
２０に導かれ、一部の蒸気は、空調器９にも導かれる．
２３はヒートポンプ用蒸気回路，２４は空調器用蒸気回
路である．エコ名マイザ２８．空気予熱器２９及び集塵
器３０は、いずれも燃焼炉の排ガス放出回路に設けられ
ている，３０は煙突である．３２は、ボイラ給水回路で
あり，ヒートポンプ２２の吸収器１９、凝縮器２ｌを通
り、更にエコノマイザ２８を通ってボイラ２７にボイラ
給水が供給されるようになっている．３４は，外気であ
り、空気予熱器２９で昇温された空気３５は、空調器９
に導かれる．１４は排気ファン．３９は給気ファンであ
る，以上のように構成した本実施例の作用について次に説明
する．空調器９で温度（及び湿度）が調整された空気は，給気
ファン３９により塗装ブース３内に供給される．塗装ブ
ース３内で仕事を終えた空気は、ベンチュリシャワー１
０を通って排気ファン１４により大気中に放出される．上記ベンチュリシャワー１０を通過する際に空気と回収
液との間で熱交換されて，空気の保有熱は、回収液によ
り回収され、同時、空気中に含まれている塗料粕は除去
される．これにより、空気は冷却されかつ、清浄化され
て大気中に放散される．一方熱回収した回収液は昇温さ
れると共に、多量の塗料ミストを含むことになる．この回収液３Ｂの保有熱は、蒸発器１Ｂ内において，ヒ
ートポンプ２２内を循環している吸収液（例えば臭化リ
チウム）が吸収している水分を蒸発させて放熱する．こ
の蒸気は、吸収器１９に導かれて、ボイラ給水３２を昇
温する．次に，吸収器ｌ９で水分を吸収した吸収液は、
発生器２０に導かれて、ヒートポンプ用蒸気回路２４か
らの蒸気により加熱され，吸収器ｌ８で吸収した水分が
蒸発すると共に吸収液は濃縮される．蒸発した蒸気は，
凝縮器２１に導かれて、給木３２を更に昇温する．上記
濃縮された吸収液は、ポンブ４０にて吸収器ｌ９に循環
され，又上記凝縮器２１にて放熱（給水３２昇温）し凝
縮した蒸気は、ボンプ４１にて蒸発器１８に供給され、
ヒートポンプ２２のサイクルが行なわれる．このようにして、回収液３６の保有熱は、蒸発器１８と
吸収器ｌ８を介してボイラ給水３２に授熱され、一方、
ヒートポンプ用蒸気回路２３からの熱は，ヒートポンプ
２２の駆動用に供されると共に凝縮器２ｌにて給水３２
に授熱される．このようにして、ヒートポンプ２２の吸
収器１８と凝縮器２ｌにて受熱し昇温した給水は，更に
エコノマイザ２８で受熱し、ボイラ２７に給水される．又、空調器用蒸気回路２４の熱は、空調器９の温度調整
用の熱として利用される．又、燃焼炉２４の排ガスの保
有熱は、空気予熱器２９により空気３４を昇温し、昇湿
された空気３５として空調器９の消費熱が補なわれる．〔発明の効果〕以上詳述した通り，本発明による塗装ブースの排熱回収
装置によれば、回収液中の塗料ミストを除去してヒート
ポンプの蒸発器に導いて熱回収をするようにした回収液
循環回路と、分離除去した塗料粕を燃焼炉に導いて燃焼
させる塗料ミスト燃焼回路と、塗料粕の燃焼熱で蒸気を
発生し，ヒートポンプを駆動するヒートポンプ用蒸気回
路及び空調器の熱源として蒸気を使用する空調器用蒸気
回路と，ヒートポンプの吸収器及び凝縮器を通り、更に
エコノマイザを通ってボイラに至るボイラ給水回路とを
設けたので，塗装ブースから排出される空気の保有熱は
，ヒートボンプの蒸発器及び吸収器を介してボイラ給水
にて効率よく回収することができた．又、捕獲した塗料粕は、燃焼炉で燃焼して，この燃焼熱
は、ヒートポンプの駆動用熱源として利用されると共に
、凝縮器にてボイラ給水の昇温，エコノマイザにて更に
ボイラ給水の昇温及び空調器の熱源としてその熱は回収
され、上記排出される空気の保有熱の熱回収と併せて、
熟回収効率を大巾に向上するなど優れた効果を有する．又、塗料粕は、燃料として使用することにより、ヒート
ポンプの駆動用熱源及び空調器の熱源を賄うこ′とがで
き、省資源及び省エネルギの観点より、産業上果す効果
は極めて顕著なものがある．更には、塗料粕による詰り等の不具合はないので、装置
を停止するような事態は発生せず、装置の稼動率を大巾
に向上し、又塗料粕の処理も不必要となるなどの優れた
効果を有する．DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exhaust heat recovery device for a paint booth that efficiently recovers exhaust heat from the paint booth. [Prior Art] Painting of automobiles, etc. is carried out in a sealed paint booth. Also, depending on the type of paint, for example, when using water-based paint, the temperature and humidity inside the painting booth will affect the quality of the painting, so the air inside the painting booth must be adjusted so that the temperature and humidity are always kept at an appropriate level. There is a need to. Figure 2 shows a conventional exhaust heat recovery device for a paint booth (Japanese Patent Publication No. 57-54184). In the figure, duct 1
The outside air taken inside is subjected to temperature and humidity adjustment in a heat exchanger 2, and then supplied to the painting booth 3. The heat retained in the air leaving the paint booth 3 is recovered by the exhaust heat recovery heat exchanger 4 and released into the atmosphere. On the other hand, the recovered heat is
It is supplied to the pressurized heat pump 5 and used as a heat source for driving the heat pump 5. Reference numeral 6 denotes a separately installed heat source, which is provided to supplement heat when the heating by the heat pump 5 is insufficient. Note that 7 is a condenser and 8 is an evaporator. This exhaust heat recovery device for a paint booth is designed to directly recover the heat retained in the air exhausted from the paint booth 3 using a heat exchanger 4 for exhaust heat recovery (hereinafter referred to as a direct exhaust heat recovery method). In contrast, the conventional paint booth exhaust heat recovery device shown in Figure 3 recovers heat using a heat recovery liquid as a medium (hereinafter referred to as the heat recovery liquid method). That is, air whose temperature and humidity have been adjusted by the air conditioner 9 is guided into the painting booth 3. When this air leaves the painting booth 3, it passes through a venturi shower 10 formed by the recovered liquid, and during this passage, heat exchange occurs and paint mist in the air is also captured by the venturi shower 10. ．． Then, the air that has been cooled (heat radiated) by the venturi shower 10 and from which the paint mist has been removed is transferred to the exhaust fan 14.
The collected tank, which is discharged into the atmosphere while receiving heat and containing paint mist, is led to a paint mist removal device 11. The recovered liquid from which the paint mist has been removed is used as a heat source for driving the paint pump 5, and then is returned to the water film formation gutter l2 of the coating booth 3, flows down on the water film plate 13, and is then passed through the venturi. shower! Form O. Note that 7 is a condenser and 8 is an evaporator. [Problems to be solved by the invention] In the above-mentioned conventional paint booth exhaust heat recovery device, first of all, in the case of the direct exhaust heat recovery method, a large amount of paint sludge is contained in the air discharged from the paint booth. As a result, there was a problem in that paint scum adhered to the heat transfer surface of the heat exchanger for waste heat recovery, reducing heat exchange efficiency. As a result, sufficient heat recovery is not possible, the ventilation resistance of the heat exchanger for exhaust heat recovery increases, the power of the exhaust fan increases, and wasted energy is consumed. This required removal work, and the equipment was stopped during that time, resulting in a reduction in operating efficiency. Furthermore, the removed paint scum was simply disposed of. In addition, in the case of a method using a heat recovery liquid, there are no problems like the above-mentioned direct waste heat recovery method, but since the collected paint scum was disposed of as is, heat recovery may not be sufficient. First, there were also problems from the perspective of resource conservation. [Means for solving the problem] In order to solve the above problem, the present invention introduces the recovered liquid from the paint booth to a paint mist removal device to remove the paint mist, and then guides the recovered liquid to the evaporator of the heat pump. A recovery liquid circulation circuit that radiates heat and guides it to the water film forming gutter of the painting booth, a paint mist combustion circuit that guides the paint sludge separated by the paint mist removal device to the combustion furnace and burns it, and A heat pump steam circuit that generates steam in a boiler that uses combustion heat and guides this steam to a heat pump generator to drive the heat pump, and a part of the steam that is guided to an air conditioner and supplied to the painting booth to control the temperature of the air. It consists of a steam circuit for the air conditioner which is connected to the W section, and a boiler water supply circuit which receives heat through the absorber and condenser of the heat pump, further receives heat through an economizer installed in the middle of the exhaust gas discharge circuit of the combustion furnace, and guides the heat to the boiler. It is characterized by [Operation] With the above configuration, the retained heat of the air leaving the painting booth is radiated by the evaporator of the heat pump through the recovered liquid circulation circuit, and this radiated heat is transferred to the boiler via the absorber of the heat pump. Gives heat to the water supply. On the other hand, the combustion heat of paint sludge is absorbed in a boiler to generate steam, which drives a heat pump.
Heat is transferred to the boiler feed water via the condenser of the heat pump, and heat retained in the combustion exhaust gas of paint sludge is transferred to the boiler feed water via the economizer. Furthermore, some of the steam is used as a heat source for air conditioners. In this way, the retained heat of the air leaving the paint booth and the combustion heat of the paint sludge are efficiently recovered. [Example] An example of the present invention will be described in detail below. In Figure 1, 3 is a painting booth. 9 is an air conditioner. 10 is a venturi shower, 12 is a water film formation gutter, and 13 is a water film plate, and the same parts as shown in Fig. 3 are designated by the same symbols. Reference numeral 15 denotes a paint mist removal device, which removes paint mist contained in the collected liquid 3B discharged from the painting booth 3. The recovered liquid from which paint mist has been removed is
Evaporator l8 of heat pump 22 with shower pump l6
The liquid is guided back to the water film forming gutter 12 of the coating booth 3 and reused as a recovered liquid for the venturi shower. 17 is a recovered liquid circulation circuit designed to reuse the recovered liquid as described above. On the other hand, the paint sludge separated by the paint mist removal equipment 1i15 is
It is burned in the paint sludge combustion burner 2B of the combustion furnace 25.
3B is the paint mist combustion circuit. For example, a conveyor scrubber is used as the paint mist removing device 15, and the treatment is performed continuously. 27 is a boiler, which generates steam using the combustion heat of paint sludge burned in the combustion furnace 25. 33 is a steam header for storing the steam. The steam stored in the steam header 33 is guided to the generator 20 of the heat pump 22, and some of the steam is also guided to the air conditioner 9.
23 is a steam circuit for a heat pump, and 24 is a steam circuit for an air conditioner. Eco name Maiza 28. The air preheater 29 and the dust collector 30 are both provided in the exhaust gas discharge circuit of the combustion furnace, and 30 is a chimney. 32 is a boiler water supply circuit in which boiler water is supplied to the boiler 27 through the absorber 19 of the heat pump 22, the condenser 2l, and further through the economizer 28. 34 is outside air, and the air 35 heated by the air preheater 29 is heated by the air conditioner 9.
Guided by. 14 is an exhaust fan. 39 is an air supply fan.The operation of this embodiment configured as above will be explained next. Air whose temperature (and humidity) has been adjusted by the air conditioner 9 is supplied into the painting booth 3 by the air supply fan 39. The air that has finished work inside the painting booth 3 is sent to the Venturi shower 1.
0 and is discharged into the atmosphere by the exhaust fan 14. When the air passes through the venturi shower 10, heat is exchanged between the air and the recovered liquid, and the heat retained in the air is recovered by the recovered liquid, and at the same time, paint residue contained in the air is removed. As a result, the air is cooled, purified, and released into the atmosphere. On the other hand, the temperature of the heat-recovered liquid increases and it also contains a large amount of paint mist. The heat retained in the recovered liquid 3B is radiated in the evaporator 1B by evaporating the moisture absorbed by the absorption liquid (for example, lithium bromide) circulating in the heat pump 22. This steam is led to the absorber 19 and raises the temperature of the boiler feed water 32. Next, the absorbent liquid that has absorbed moisture in the absorber 19 is
It is guided to the generator 20 and heated by the steam from the heat pump steam circuit 24, and the water absorbed in the absorber 18 is evaporated and the absorbed liquid is concentrated. The evaporated steam is
The temperature of the supplied wood 32 is further raised by the condenser 21. The concentrated absorption liquid is circulated to the absorber 19 by the pump 40, and the vapor that is condensed by dissipating heat (raising the temperature of the feed water 32) in the condenser 21 is supplied to the evaporator 18 by the pump 41.
The heat pump 22 is cycled. In this way, the heat retained in the recovered liquid 36 is transferred to the boiler feed water 32 via the evaporator 18 and the absorber l8, while
The heat from the heat pump steam circuit 23 is used to drive the heat pump 22, and is also supplied to the water supply 32 in the condenser 2l.
Heat is transferred to In this way, the feed water that has received heat and increased temperature in the absorber 18 and condenser 2l of the heat pump 22 further receives heat in the economizer 28 and is supplied to the boiler 27. Further, the heat of the air conditioner steam circuit 24 is used as heat for temperature adjustment of the air conditioner 9. Further, the heat retained in the exhaust gas of the combustion furnace 24 is used to raise the temperature of the air 34 by the air preheater 29, and the heat consumed by the air conditioner 9 is compensated for as humidified air 35. [Effects of the Invention] As detailed above, according to the paint booth waste heat recovery device according to the present invention, the paint mist in the recovered liquid is removed and the heat is recovered by guiding it to the evaporator of the heat pump. A liquid circulation circuit, a paint mist combustion circuit that guides the separated and removed paint sludge to a combustion furnace and burns it, a heat pump steam circuit that generates steam from the combustion heat of the paint sludge to drive a heat pump, and a steam circuit that generates steam as a heat source for an air conditioner. We have installed a steam circuit for the air conditioner that uses the heat pump, and a boiler water supply circuit that passes through the heat pump's absorber and condenser, and then passes through the economizer to the boiler. It was possible to efficiently recover boiler feed water through an evaporator and absorber. In addition, the captured paint scum is burned in a combustion furnace, and this combustion heat is used as a heat source for driving a heat pump, and is also used to raise the temperature of boiler feed water in a condenser, and further to raise the temperature of boiler feed water in an economizer. The heat is recovered as a heat source for the air conditioner, and in addition to the heat recovery of the heat retained in the discharged air,
It has excellent effects such as greatly improving recovery efficiency. In addition, by using paint sludge as fuel, it can serve as a heat source for driving heat pumps and air conditioners, and from the viewpoint of resource and energy conservation, the industrial effects are extremely significant. be. Furthermore, since there are no problems such as clogging caused by paint sludge, there is no need to stop the equipment, greatly improving the operating rate of the equipment, and there is no need to dispose of paint sludge. It has a beneficial effect.
【図面の簡単な説明】[Brief explanation of drawings]第１図は，本発明の一実施例を示し，塗装ブースの排熱
回収装置の系統図である．８２図及び第３図は従来例で
あり、第２図は、空気の保有熱を直接排熱回収用熱交換
器で回収するようにした塗装ブースの排熱回収装置を示
すブロック図、第３図は、空気の保有熱を回収液にて回
収するようにした塗装ブースの排熱回収装置の系統図で
ある．３・・・塗装ブース，９・・・空調器， １０・・・ベ
ンチュリシャワー， １２・・・水膜形成用樋， １５
・・・塗料ミスト除去装置，１７・・・回収液循環回路
， １８・・・蒸発器，１９・・・吸収器， ２０・・
・発生器，２１・・・凝縮器，２２・・・ヒートポンプ
．２３・・・ヒートボンプ用，ｆ３％回路，２４・・・
空調器用蒸気回路，２５・・・燃焼炉，２７・・・ボイ
ラ．２８・・・エコノマイザ。特許出願人 トヨタ自動車株式会社（ほか２名）第２図Figure 1 shows one embodiment of the present invention and is a system diagram of an exhaust heat recovery device for a paint booth. Figures 82 and 3 are conventional examples, and Figure 2 is a block diagram showing an exhaust heat recovery device for a paint booth in which the heat retained in the air is directly recovered by a heat exchanger for exhaust heat recovery. The figure is a system diagram of a paint booth exhaust heat recovery device that recovers the heat retained in the air using a recovery liquid. 3... Paint booth, 9... Air conditioner, 10... Venturi shower, 12... Water film formation gutter, 15
...paint mist removal device, 17...recovered liquid circulation circuit, 18...evaporator, 19...absorber, 20...
- Generator, 21... Condenser, 22... Heat pump. 23... for heat bomb, f3% circuit, 24...
Steam circuit for air conditioner, 25... Combustion furnace, 27... Boiler. 28...Economizer. Patent applicant Toyota Motor Corporation (and 2 others) Figure 2