JPH0642869A - Drying furnace - Google Patents
Drying furnaceInfo
- Publication number
- JPH0642869A JPH0642869A JP4218417A JP21841792A JPH0642869A JP H0642869 A JPH0642869 A JP H0642869A JP 4218417 A JP4218417 A JP 4218417A JP 21841792 A JP21841792 A JP 21841792A JP H0642869 A JPH0642869 A JP H0642869A
- Authority
- JP
- Japan
- Prior art keywords
- zone
- drying
- drying zone
- ventilation
- furnace
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Drying Of Solid Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、乾燥開始ゾーンから最
終乾燥ゾーンまでの複数の乾燥ゾーンを順次通過させて
被乾燥物を乾燥する乾燥炉装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drying furnace device for drying an article to be dried by successively passing through a plurality of drying zones from a drying start zone to a final drying zone.
【０００２】[0002]
【従来の技術】被乾燥物に付着した水分を除去する水分
乾燥炉は、水の蒸発温度以上に加熱した空気を被乾燥物
に吹き付けて乾燥させている。水分乾燥炉内の露点が高
いと乾燥不足となるため、蒸発した水分を炉外に排出し
て炉内露点を常温以下に保つように、各乾燥ゾーンから
炉内空気の大量換気を行っている。2. Description of the Related Art In a moisture drying furnace for removing moisture adhering to an object to be dried, air heated to an evaporation temperature of water or higher is blown onto the object to be dried. If the dew point in the moisture drying oven is too high, the drying will be insufficient.Therefore, a large amount of air in the oven is ventilated from each drying zone so that the evaporated moisture is discharged to the outside of the oven to keep the dew point in the oven below room temperature. .
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記し
た水分乾燥炉では図３に示すように、各乾燥ゾーンａ，
ｂ，ｃから換気した大量の高温空気を、排気ダクトｄに
集め排気ファンｅにより工場天井部ｆから大気に放出し
てしまう。このため、加熱エネルギーの消費量が増加し
てランニングコストが高い。また、各乾燥ゾーンａ，
ｂ，ｃから換気する排気ダクトｄや排気ファンｅ等の設
備や装置が大型化して設備投資額が大きいとともに、前
記設備は現場施工のため生産立上り期間が長期化する。
さらに、設備のレイアウトの変更に応じて、排気ダクト
等を設計施工する必要がある等の問題点がある。一方、
大気に放出する大量の高温空気から、いわゆる排熱回収
を行う試みもあるが、排熱回収後の排気は大気に放出さ
れているのが現状である。本発明は、高温排気を大気に
放出することなく循環再利用することにより、省エネル
ギー効果を実現するとともに排気ダクトや排気ファンを
不要として、上記問題点を解決できる乾燥炉装置を提供
することを目的とするものである。However, in the above-mentioned moisture drying furnace, as shown in FIG.
A large amount of high-temperature air ventilated from b and c is collected in the exhaust duct d and discharged from the factory ceiling f to the atmosphere by the exhaust fan e. Therefore, the consumption of heating energy is increased and the running cost is high. In addition, each drying zone a,
The equipment and devices such as the exhaust duct d and the exhaust fan e that ventilate from b and c are large in size, and the capital investment amount is large, and the production start-up period of the equipment is prolonged because of the on-site construction.
Further, there is a problem that it is necessary to design and construct an exhaust duct or the like according to the change of the layout of the equipment. on the other hand,
There are attempts to recover so-called exhaust heat from a large amount of high-temperature air that is released to the atmosphere, but the exhaust gas after exhaust heat recovery is currently released to the atmosphere. It is an object of the present invention to provide a drying furnace apparatus that can solve the above-mentioned problems by realizing high energy saving effect by recycling high temperature exhaust gas without releasing it to the atmosphere and eliminating exhaust duct and exhaust fan. It is what
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
の具体的手段として、乾燥開始ゾーンから最終乾燥ゾー
ンまでの複数の乾燥ゾーンを順次通過させて被乾燥物を
乾燥する乾燥炉装置において、前記最終乾燥ゾーンの炉
内露点を約３５℃以下に制御すべく該最終乾燥ゾーンか
らその前段階の乾燥ゾーンに換気し、続いてその乾燥ゾ
ーンからその前段階の乾燥ゾーンへと順次換気して、最
終的には前記乾燥開始ゾーンへ換気することを特徴とす
る乾燥炉装置が提供される。Means for Solving the Problems As a concrete means for achieving the above object, in a drying oven device for drying an object to be dried by successively passing through a plurality of drying zones from a drying start zone to a final drying zone, The final drying zone is ventilated from the final drying zone to the preceding drying zone in order to control the in-furnace dew point to about 35 ° C. or lower, and then from the drying zone to the preceding drying zone. Finally, a drying oven device is provided, which is characterized by ventilating to the drying initiation zone.
【０００５】[0005]
【作用】上記構成の乾燥炉装置は、最終乾燥ゾーンの炉
内露点を約３５℃以下に制御すべく該最終乾燥ゾーンか
らその前段階の乾燥ゾーンに換気し、続いてその乾燥ゾ
ーンからその前段階の乾燥ゾーンへと順次換気して、最
終的には乾燥開始ゾーンへ換気する。また、前記乾燥開
始ゾーンに換気された空気を排熱回収除湿装置を経由し
て、前記最終乾燥ゾーンに還流するようにしてもよい。In the drying oven device having the above-mentioned structure, the final drying zone is ventilated to the preceding drying zone in order to control the dew point in the final drying zone to about 35 ° C. or lower, and then the drying zone is moved to the preceding drying zone. Sequential ventilation is provided to the stage drying zone and finally to the drying initiation zone. Further, the air ventilated in the drying start zone may be returned to the final drying zone via the exhaust heat recovery dehumidifier.
【０００６】[0006]
【実施例】以下、本発明の乾燥炉装置の一実施例を添付
図面を参照して説明する。図１は自動車用熱交換器の水
分乾燥炉装置の概略構成図である。水分乾燥炉(以下乾
燥炉という)本体１は、第１乾燥ゾーン２、第２乾燥ゾ
ーン３、第３乾燥ゾーン４を併設した構成になり、第１
乾燥ゾーン２の入口と、第３乾燥ゾーン４の出口にそれ
ぞれ断気室５，６を形成する。前記第１乾燥ゾーン２が
本発明の乾燥開始ゾーンに相当し、第３乾燥ゾーン４が
最終乾燥ゾーンに相当する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the drying furnace apparatus of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram of a moisture drying furnace device of a heat exchanger for an automobile. The water drying oven (hereinafter referred to as a drying oven) main body 1 has a configuration in which a first drying zone 2, a second drying zone 3 and a third drying zone 4 are provided side by side.
Deaeration chambers 5 and 6 are formed at the inlet of the drying zone 2 and the outlet of the third drying zone 4, respectively. The first drying zone 2 corresponds to the drying start zone of the present invention, and the third drying zone 4 corresponds to the final drying zone.
【０００７】乾燥炉本体１内には搬送路７が形成され、
図示しない搬送機構により被乾燥物である自動車用熱交
換器を搬送して、順次第１乾燥ゾーン２から第３乾燥ゾ
ーン４までを通過させる。第１〜第３の各乾燥ゾーン２
〜４の炉床部には、それぞれ炉内空気を加熱するバーナ
８〜１０が配設されている。また、第１乾燥ゾーン２と
第２乾燥ゾーン３間、第２乾燥ゾーン３と第３乾燥ゾー
ン４間を連通する換気循環路１１，１２が炉天井部に設
けられ、それぞれ換気ファン１３，１４が介装される。
第１乾燥ゾーン２の炉天井部には排気ダクト１５を設
け、第３乾燥ゾーン４の炉天井部には送気ダクト１６を
設けて排熱回収除湿装置２１と接続する。A transport path 7 is formed in the drying furnace main body 1,
An automobile heat exchanger, which is an object to be dried, is transported by a transport mechanism (not shown) and sequentially passes from the first drying zone 2 to the third drying zone 4. First to third drying zones 2
Burners 8 to 10 for heating the in-furnace air are arranged in the hearth floors 4 to 4, respectively. In addition, ventilation circulation paths 11 and 12 that communicate between the first drying zone 2 and the second drying zone 3 and between the second drying zone 3 and the third drying zone 4 are provided in the furnace ceiling portion, and ventilation fans 13 and 14 are provided, respectively. Is installed.
An exhaust duct 15 is provided on the furnace ceiling of the first drying zone 2, and an air supply duct 16 is provided on the furnace ceiling of the third drying zone 4 to connect to the exhaust heat recovery / dehumidification device 21.
【０００８】排熱回収除湿装置２１は図２に示すよう
に、圧縮機２２、凝縮機２３、凝縮機ファン２４、蒸発
器２５、蒸発器ファン２６及び膨張弁２７等から構成し
た冷凍サイクル２８に、ヒートパイプ熱交換器２９を付
設してなるものである。そして、ヒートパイプ熱交換器
２９の高温側２９ａに前記排気ダクト１５を接続し、低
温側２９ｂに前記送気ダクト１６を接続する。前記蒸発
器２５には排水ドレン３０を設ける。上記により、第１
乾燥ゾーン２→排気ダクト１５→ヒートパイプ熱交換器
２９の高温側２９ａ→冷凍サイクル２８の蒸発器２５→
ヒートパイプ熱交換器２９の低温側２９ｂ→送気ダクト
１６→第３乾燥ゾーン４→換気循環路１２→第２乾燥ゾ
ーン３→換気循環路１１→第１乾燥ゾーン２と換気を循
環させる換気循環経路３１が構成される。As shown in FIG. 2, the exhaust heat recovery / dehumidification device 21 has a refrigeration cycle 28 composed of a compressor 22, a condenser 23, a condenser fan 24, an evaporator 25, an evaporator fan 26, an expansion valve 27 and the like. The heat pipe heat exchanger 29 is additionally provided. Then, the exhaust duct 15 is connected to the high temperature side 29a of the heat pipe heat exchanger 29, and the air supply duct 16 is connected to the low temperature side 29b. The evaporator 25 is provided with a drainage drain 30. From the above, the first
Drying zone 2 → Exhaust duct 15 → High temperature side 29a of heat pipe heat exchanger 29 → Evaporator 25 of refrigeration cycle 28 →
Low temperature side 29b of heat pipe heat exchanger 29 → air supply duct 16 → third drying zone 4 → ventilation circulation path 12 → second drying zone 3 → ventilation circulation path 11 → ventilation circulation for circulating ventilation to first drying zone 2 The route 31 is configured.
【０００９】上記実施例の作動を説明する。乾燥炉本体
１の第１乾燥ゾーン２〜第３乾燥ゾーン４に配設したバ
ーナ８〜１０に点火するとともに、換気循環路１１，１
２の換気ファン１３，１４を回転し、排熱回収除湿装置
２１を駆動する。換気循環経路３１により、第１乾燥ゾ
ーン２内から排気ダクト１５を通じて導入される高温排
気は、ヒートパイプ熱交換器２９の高温側２９ａで排気
熱を吸収される。続いて冷凍サイクル２８の蒸発器２５
を通過して冷却除湿される。除湿された水分は排水ドレ
ン３０により回収される。そして、除湿乾燥した低温の
排気はヒートパイプ熱交換器２９の低温側２９ｂへ流
れ、前記高温側２９ａで吸収した排気熱により加熱され
る。高温乾燥状態になった空気が送ダクト１６を通して
第３乾燥ゾーン４へ還流される。The operation of the above embodiment will be described. The burners 8 to 10 arranged in the first drying zone 2 to the third drying zone 4 of the drying furnace main body 1 are ignited, and the ventilation circulation paths 11 and 1 are provided.
The second ventilation fans 13 and 14 are rotated to drive the exhaust heat recovery dehumidifier 21. Due to the ventilation circulation path 31, the high temperature exhaust introduced from the inside of the first drying zone 2 through the exhaust duct 15 absorbs the exhaust heat on the high temperature side 29 a of the heat pipe heat exchanger 29. Then, the evaporator 25 of the refrigeration cycle 28
Is cooled and dehumidified. The dehumidified water is collected by the drainage drain 30. Then, the dehumidified and dried low temperature exhaust gas flows to the low temperature side 29b of the heat pipe heat exchanger 29 and is heated by the exhaust heat absorbed by the high temperature side 29a. The air in the high temperature dry state is returned to the third drying zone 4 through the sending duct 16.
【００１０】送気ダクト１６を通して還流される高温乾
燥状態の空気量は、第３乾燥ゾーン４の炉内露点を約３
５℃以下に保つために必要な量に調整する。この空気量
に相当する炉内空気を換気循環路１２を通して、第３乾
燥ゾーン４から第２乾燥ゾーン３へ換気する。さらに、
換気循環路１１を通して第２乾燥ゾーン３から第１乾燥
ゾーン２へ換気する。そして、この間に被乾燥物である
自動車用熱交換器は、約１６０℃に加熱昇温した乾燥炉
本体１内に設けた搬送路７を、第１乾燥ゾーン２から第
３乾燥ゾーン４に向かって搬送され乾燥される。The amount of high-temperature dry air that is recirculated through the air supply duct 16 has a dew point in the furnace of the third drying zone 4 of about 3
Adjust to the amount needed to keep it below 5 ° C. The furnace air corresponding to this air amount is ventilated from the third drying zone 4 to the second drying zone 3 through the ventilation circulation path 12. further,
Ventilation is performed from the second drying zone 3 to the first drying zone 2 through the ventilation circulation path 11. In the meantime, in the heat exchanger for automobiles, which is the material to be dried, the transport path 7 provided in the drying furnace main body 1 heated to about 160 ° C. goes from the first drying zone 2 to the third drying zone 4. Are transported and dried.
【００１１】上記のように本実施例は、被乾燥物の搬送
方向とは逆方向に換気するいわゆる向流換気を行うこと
により、第３乾燥ゾーン４では炉内露点が３０〜３２℃
に、第２乾燥ゾーン３では炉内露点が３５〜４０℃に、
第１乾燥ゾーン２では炉内露点が４０〜４５℃に保つこ
とができた。また、この炉内露点を保つために必要な換
気量が１２ｍ3／ｍｉｎと、乾燥ゾーン毎の個別換気方
式に比べて約８０％も低減できた。As described above, in this embodiment, the so-called counter-current ventilation is performed to ventilate the article to be dried in the direction opposite to the conveying direction, so that the dew point in the furnace is 30 to 32 ° C. in the third drying zone 4.
In the second drying zone 3, the dew point in the furnace is 35 to 40 ° C,
In the first drying zone 2, the dew point in the furnace could be kept at 40 to 45 ° C. Further, the ventilation amount required to maintain the dew point in the furnace was 12 m 3 / min, which was about 80% less than the individual ventilation system for each drying zone.
【００１２】また、換気量を低減できることにより、排
熱回収除湿装置２１で排気を除湿乾燥処理して加熱昇温
し、第３乾燥ゾーン４へ還流することが可能となる。こ
れにより、従来のように換気量が大量のため再処理を行
うことなく、そのまま排気ダクトから大気に放出する必
要がないから、加熱エネルギーの消費量が減少してラン
ニングコストを低減できるばかりでなく、各乾燥ゾーン
から換気する大型の排気ダクトや排気ファン等の設備や
装置が不要となりコストダウンを図ることができる。さ
らに、設備のレイアウトの変更も容易に行うことがで
き、生産立上り期間を短縮できる等の利点がある。Further, since the ventilation amount can be reduced, the exhaust heat recovery / dehumidification device 21 can dehumidify and dry the exhaust gas to heat and raise the temperature of the exhaust gas and return it to the third drying zone 4. As a result, it is not necessary to re-treat the air as it is from the exhaust duct as it is because of the large ventilation volume as in the past, so it is not only possible to reduce the consumption of heating energy and reduce the running cost. Therefore, equipment and devices such as a large exhaust duct and an exhaust fan for ventilating from each drying zone are not required, and the cost can be reduced. Further, there is an advantage that the layout of the equipment can be easily changed and the production start-up period can be shortened.
【００１３】尚、上記実施例のようにバーナ加熱の場合
は、爆発防止のためのプリパージ用ダクトを残したセミ
クローズドシステムとしてもよい。また、本実施例装置
は水分乾燥のみならず油等の乾燥に用いることもでき
る。加熱熱源を炉天井部に配置した電気ヒータとした乾
燥炉に、排熱回収除湿装置を付設して換気循環経路を構
成することもできる。In the case of burner heating as in the above embodiment, a semi-closed system may be used in which a pre-purging duct for explosion prevention is left. Further, the apparatus of this embodiment can be used not only for drying water but also for drying oil and the like. It is also possible to construct a ventilation circulation path by attaching an exhaust heat recovery / dehumidification device to a drying furnace that uses an electric heater as a heating heat source arranged in the roof part of the furnace.
【００１４】[0014]
【発明の効果】本発明の乾燥炉装置は上記した構成を有
し、最終乾燥ゾーンの炉内露点を約３５℃以下に制御す
べく該最終乾燥ゾーンからその前段階の乾燥ゾーンに換
気し、続いてその乾燥ゾーンからその前段階の乾燥ゾー
ンへと順次換気して、最終的には乾燥開始ゾーンへ換気
するようにして換気量を低減したから、加熱エネルギー
の消費量が少なくてすみコストダウンを実現できるとと
もに、最終乾燥ゾーンの炉内露点が約３５℃以下に保持
されるから乾燥効率を一定に維持できる。また、前記乾
燥開始ゾーンに換気された空気を排熱回収除湿装置を経
由して、前記最終乾燥ゾーンに還流するから、換気を大
気に放出するためのダクトやファンが不要となり、装置
構成を低コストで小型化することができる。さらに回収
した排熱により加熱昇温した空気を還流するようにした
から、一層の省エネを実現できる等の効果がある。EFFECT OF THE INVENTION The drying oven device of the present invention has the above-mentioned constitution, and the final drying zone is ventilated to the preceding drying zone in order to control the in-furnace dew point of the final drying zone to about 35 ° C. or lower, Next, the ventilation volume was reduced by sequentially ventilating from that drying zone to the preceding drying zone, and finally to the drying start zone, reducing heating energy consumption and cost reduction. In addition, since the dew point in the furnace of the final drying zone is maintained at about 35 ° C. or lower, the drying efficiency can be maintained constant. In addition, since the air ventilated to the drying start zone is returned to the final drying zone via the exhaust heat recovery dehumidifier, a duct or fan for releasing the ventilation to the atmosphere is not required, and the device configuration is low. The cost can be reduced. Further, since the air heated and heated by the recovered exhaust heat is circulated, there is an effect that further energy saving can be realized.
【図１】本発明の乾燥炉装置の概略構成図である。FIG. 1 is a schematic configuration diagram of a drying furnace device of the present invention.
【図２】排熱回収除湿装置の概略断面図である。FIG. 2 is a schematic cross-sectional view of an exhaust heat recovery dehumidifier.
【図３】従来の乾燥炉装置の概略構成図である。FIG. 3 is a schematic configuration diagram of a conventional drying furnace device.
１...乾燥炉本体 ２...第１乾燥ゾーン(乾燥開始ゾーン) ３...第２乾燥ゾーン ４...第３乾燥ゾーン４(最終乾燥ゾーン) ７...搬送路 ２１...排熱回収除湿装置 ３１...換気循環経路 1 ... Drying oven main body 2 ... 1st drying zone (drying start zone) 3 ... 2nd drying zone 4 ... 3rd drying zone 4 (final drying zone) 7 ... Conveyance path 21. .. Exhaust heat recovery dehumidifier 31 ... Ventilation circulation path
Claims (2)
の複数の乾燥ゾーンを順次通過させて被乾燥物を乾燥す
る乾燥炉装置において、 前記最終乾燥ゾーンの炉内露点を約３５℃以下に制御す
べく該最終乾燥ゾーンからその前段階の乾燥ゾーンに換
気し、続いてその乾燥ゾーンからその前段階の乾燥ゾー
ンへと順次換気して、最終的には前記乾燥開始ゾーンへ
換気することを特徴とする乾燥炉装置。1. A drying furnace apparatus for drying an object to be dried by successively passing through a plurality of drying zones from a drying start zone to a final drying zone, wherein the dew point in the furnace of the final drying zone is controlled to about 35 ° C. or lower. Therefore, ventilation is performed from the final drying zone to the preceding drying zone, then sequentially from the drying zone to the preceding drying zone, and finally to the drying start zone. Drying oven device.
排熱回収除湿装置を経由して、前記最終乾燥ゾーンに還
流するようにしたことを特徴とする請求項１記載の乾燥
炉装置。2. The drying furnace apparatus according to claim 1, wherein the air ventilated to the drying start zone is recirculated to the final drying zone via an exhaust heat recovery dehumidifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4218417A JPH0642869A (en) | 1992-07-23 | 1992-07-23 | Drying furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4218417A JPH0642869A (en) | 1992-07-23 | 1992-07-23 | Drying furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0642869A true JPH0642869A (en) | 1994-02-18 |
Family
ID=16719590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4218417A Pending JPH0642869A (en) | 1992-07-23 | 1992-07-23 | Drying furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0642869A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004109003A1 (en) * | 2003-06-10 | 2004-12-16 | Nyeon-Mook Choi | Drying system with waste heat recovery apparatus |
| CN102853647A (en) * | 2012-10-16 | 2013-01-02 | 罗二元 | Oast dehumidifying and waste heat recovering system |
| CN115435582A (en) * | 2022-08-31 | 2022-12-06 | 青岛海信日立空调***有限公司 | Multistage waste heat recovery drying system and control method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5521272A (en) * | 1978-08-03 | 1980-02-15 | Naomi Yukie | Ornamental article that use native rock |
| JPH0356878U (en) * | 1989-10-05 | 1991-05-31 |
-
1992
- 1992-07-23 JP JP4218417A patent/JPH0642869A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5521272A (en) * | 1978-08-03 | 1980-02-15 | Naomi Yukie | Ornamental article that use native rock |
| JPH0356878U (en) * | 1989-10-05 | 1991-05-31 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004109003A1 (en) * | 2003-06-10 | 2004-12-16 | Nyeon-Mook Choi | Drying system with waste heat recovery apparatus |
| CN102853647A (en) * | 2012-10-16 | 2013-01-02 | 罗二元 | Oast dehumidifying and waste heat recovering system |
| CN115435582A (en) * | 2022-08-31 | 2022-12-06 | 青岛海信日立空调***有限公司 | Multistage waste heat recovery drying system and control method thereof |
| CN115435582B (en) * | 2022-08-31 | 2023-09-05 | 青岛海信日立空调***有限公司 | Multistage waste heat recovery drying system and control method thereof |
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