JP3715157B2 - 2-stage double-effect absorption refrigerator - Google Patents

2-stage double-effect absorption refrigerator Download PDF

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JP3715157B2
JP3715157B2 JP32931199A JP32931199A JP3715157B2 JP 3715157 B2 JP3715157 B2 JP 3715157B2 JP 32931199 A JP32931199 A JP 32931199A JP 32931199 A JP32931199 A JP 32931199A JP 3715157 B2 JP3715157 B2 JP 3715157B2
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absorber
liquid
refrigerant
evaporator
solution
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JP2001147053A (en
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伸之 武田
富久 大内
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株式会社 日立インダストリイズ
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/27Relating to heating, ventilation or air conditioning [HVAC] technologies
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/62Absorption based systems

Description

【0001】
【発明の属する技術分野】
本発明は、冷凍、空気調和に利用される水冷媒、塩類水溶液を吸収液とする2段2重効用吸収冷凍機に係り、特に、3℃ないし−10℃程度の低温度利用に適する2段2重効用吸収冷凍機に関する。
【0002】
【従来の技術】
2段2重効用吸収冷凍機は、高温再生器、低温再生器、凝縮器、第1蒸発器、第1吸収器、第2蒸発器、第2吸収器、液熱交換器、溶液循環ポンプ、冷媒ポンプ、溶液散布ポンプなどを動作的に配管接続してなり、第1または第2吸収器の希溶液を濃縮する際、高温再生器と低温再生器との2重効用吸収冷凍サイクルで濃縮している。ここで、第2吸収器は第1吸収器よりも低圧で作動し、第2蒸発器は第1蒸発器よりも低温の冷水またはブラインを生成する。低温発生が可能な2段2重効用吸収冷凍サイクルは、例えば特開平7−139844号公報に記載されている。第2蒸発器と第2吸収器とを有し、第2吸収器を第1蒸発器で生成した低温媒体で冷却するようにした2段2重効用吸収サイクルである。第2蒸発器には水冷媒の凍結防止を図るため、吸収液を混合した混合冷媒が使用されている。蒸発器内の冷媒中に吸収液を混入することにより凍結防止を図るものとして、例えば特公昭58−15703号公報、特開平7−139844号公報、特開昭55−162565号公報、特開昭60−103268号公報、特開昭60−103269号公報などが挙げられる。
【0003】
【発明が解決しようとする課題】
上記従来技術の2段2重効用吸収冷凍機において、第1吸収器及び第2吸収器の液溜部の配置関係については特に述べられていない。ここに、吸収冷凍機は、液保有量を増加させるとその吸収液濃度を適正にするための冷媒保有量も多くなり、冷媒溜部の容積が大きくなって大型化するばかりでなく、負荷応答性も低下する。また、吸収液である塩類水溶液、例えば臭化リチウム水溶液(LiBr水溶液)は高濃度に濃縮されたまま冷却すると結晶固化してしまうが、そのようなトラブル時でも運転継続できるサイクル循環構成が望まれている。
【0004】
本発明の第1の目的は、機器を小型化でき、原価低減を図ることができる2段2重効用吸収冷凍機を提供することにある。
本発明の第2の目的は、負荷応答性が良く、サイクルの安定を早めることができる2段2重効用吸収冷凍機を提供することにある。
【0005】
【課題を解決するための手段】
上記目的を達成するため、本発明に係る2段2重効用吸収冷凍機の発明の構成は、第1蒸発器、第1吸収器、第2蒸発器、第2吸収器、溶液循環ポンプを有し、前記第1吸収器を冷却する冷熱媒体よりも低温の冷熱媒体で第2吸収器を冷却する塩類水溶液を吸収液とする2段2重効用吸収冷凍機において、前記第2吸収器の液溜部を第1吸収器の液溜部よりも上部に配置すると共に、前記第2吸収器の液溜部に液面検出手段を設け、前記第2吸収器の液溜部の液面が所定以下になったとき前記第2吸収器の溶液循環ポンプを停止させるものである。
【0006】
上記目的を達成するため、本発明に係る2段2重効用吸収冷凍機の他の発明の構成は、第2蒸発器の冷媒が吸収液を含む混合冷媒であって、該混合冷媒の濃度検出手段、第1蒸発器からの液冷媒供給制御手段を有し、前記第2吸収器の液溜部を第1吸収器の液溜部よりも上部に配置すると共に、前記第2吸収器の液溜部に液面検出手段を設け、前記第2吸収器の液溜部の液面が所定以下になったとき前記第2吸収器の溶液循環ポンプを停止させるものである。
【0010】
【発明の実施の形態】
以下、本発明の実施の形態を図1ないし図4を参照して説明する。
図1は、本発明の2段2重効用吸収冷凍機に係る第1の実施例の系統図である。2段2重効用吸収冷凍機は、高温再生器1A、低温低温再生器1B、凝縮器2、第1蒸発器3A、第2蒸発器3B、第1吸収器4A、第2吸収器4B、液熱交換器5A、5B、5C、溶液散布ポンプ6A、6B、溶液循環ポンプ6Cなどを配管接続し、冷媒及び吸収液の循環経路を形成している。
【0011】
高温再生器1Aには冷媒を吸収して濃度の薄くなった希溶液を都市ガスなどの燃焼ガス、排ガス、蒸気などで加熱沸騰させるための伝熱面HAが配置されており、低温再生器1Bには高温再生器1Aで発生した冷媒蒸気の凝縮潜熱を熱源として溶液を加熱沸騰させる伝熱面HBが配置されている。高温再生器1Aで発生した冷媒蒸気は、低温再生器1Bの吸収液を加熱して凝縮液化されて液冷媒になり、凝縮器2に導入される。低温再生器1Bで発生した冷媒蒸気も凝縮器2に導入され、伝熱面32内を流れる例えば冷却塔等から送られて来る冷却水CWで冷却され、凝縮液化されて液冷媒になる。
【0012】
凝縮器2で生成された液冷媒は、冷媒導管10を介して第1蒸発器3Aの冷媒液溜部8Aに導入される。この導入された冷媒液は、冷媒散布ポンプ7Aにより伝熱管31A上に散布されて蒸発し、冷媒蒸気はエリミネ−タを経由して第1吸収器4Aに導かれる。また、第1蒸発器3Aで生成された温度の低い冷熱媒体によって第2吸収器4Bを冷却できるように、第1蒸発器3Aの伝熱管31Aと第2吸収器4Bの伝熱管30Bとを循環水ポンプ27を介して熱的に連結している。このため、第1蒸発器3Aで得られた低温の冷媒の蒸発潜熱により第2吸収器4B内の伝熱管30Bが冷却される。
【0013】
第1蒸発器3Aの冷媒液溜部8Aの液冷媒は、冷媒散布ポンプ7Aにより流入量制御手段である電動弁18を経由し、混合冷媒液溜部8Bの混合冷媒散布ポンプ7Bのポンプサクション側に導入される。流速の速い混合冷媒散布ポンプ7Bのポンプサクション側で冷媒を吸収液に混合させることにより、濃度差のある両媒体の混合が速やかに行われ、濃淡電池形成による腐蝕や氷の形成を防止している。
【0014】
混合冷媒液溜部8B中の混合冷媒は、混合冷媒散布ポンプ7Bにより第2蒸発器3B中の伝熱管31B上に散布されて蒸発し、該伝熱管31B内を流れる水(もしくはブライン)を冷却する。なお、混合冷媒液溜部8Bの吸収液濃度は、濃度検出器24により検出され演算されて電動弁18の開閉を制御する。また、混合冷媒液溜部8Bの混合冷媒量は液面検出手段28により検出されて演算され、適正濃度であるのに液保有量が少ないと判断された場合には、吸収液が何らかの原因で流出して不足している場合であるから、
▲1▼吸収液を補給するように警告表示する。もしくは、メンテナンス会社にデ−タを通信手段を介して連絡する。これにより、混合冷媒液溜部8Bに吸収液を補給する。または、
▲2▼吸収液、例えば溶液循環ポンプ6Aの吐出側から分岐した溶液配管を混合冷媒散布ポンプ7Bのポンプサクション側に接続し、途中に溶液流量制御手段34、フィルタ35、銅イオン除去手段36を配置して、サイクルの吸収液を導入することにより混合冷媒液溜部8Bに吸収液を補給する。
【0015】
以上のようにして、混合冷媒液溜部8Bの液面を適正に保ち、かつ、混合冷媒濃度を適正に保つことができるので、冷媒凍結や混合冷媒散布ポンプ7Bの空転を防止でき、安全確実に運転を継続することができる。
【0016】
一方、再生器1A、1Bで冷媒蒸気を発生して濃縮された吸収液は、溶液熱交換器5A、5Bで希溶液と熱交換して低温になり、濃溶液導管12を経由して第1吸収器4Aに送られ、溶液散布ポンプ6Aにより第1吸収器4Aの伝熱管30A上に散布され管内を流れる冷却水により冷却される。これとともに、吸収液は第1蒸発器3Aで蒸発した冷媒蒸気を吸収して薄くなる。第1吸収器4Aの薄くなった吸収液は液溜部25Aを流下し、溶液散布ポンプ6Bにより溶液導管14、低温液熱交換器5Cを経由して第2吸収器4Bに送られ、伝熱管30B上に散布されて第1蒸発器3Aからの冷媒の蒸発潜熱により冷却される。また、第2蒸発器3Bからの冷媒蒸気を吸収して希釈されてさらに薄い希溶液となり、伝熱管30Bの管群下部に配置した液流抽気手段29を流下し、その際に不凝縮ガスを巻き込む。さらに、希溶液は溶液循環ポンプ6Cにより、低温液熱交換器5C、希溶液導管13、溶液熱交換器5B、5Aを経由して再生器1A、1Bに送られる。
【0017】
以上のように、2段2重効用吸収冷凍サイクルが構成さるが、本実施例では、第2吸収器4Bを第1吸収器4Aよりも高い位置に配置しているので、第2吸収器3Bの液溜部25Bは、負荷運転中のサイクルの吸収液濃度が高濃度になっている条件では、ほとんど溶液のない状態になる。これにより、
▲1▼希溶液を主として保有する液溜部を、第1吸収器4Aの液溜部25Aにすることができる。液溜部25Aの吸収液濃度は、第2吸収器4Bで生成される溶液よりも濃い中間濃度なので、第2吸収器4Bの液溜部25Bに溶液を保有するよりも冷媒の保有量が少なくてすむ。水(もしくはブライン)の温度を低く、あるいは冷却水CWの温度が高い場合はサイクルを高濃度側にシフトさせ、冷媒液溜部8Aに貯留する冷媒量を増大させる。その際、液溜部25Aの液保有量が減少して高濃度になる。もちろん、第2吸収器4Bの濃度も濃くなり液溜部25Bにある濃度も濃くなるので、この分の冷媒も冷媒溜部8Aに貯留させる。
【0018】
このため、第2吸収器4Bの液溜部25Bの液量は少なく、冷媒保有量を少なくできる。したがって、機器を小型化でき、負荷応答性を向上できるとともに、原価低減をできる、という効果がある。さらに、
▲2▼第1吸収器の液溜部25Aの下方に設置した液散布ポンプ6Bのポンプサクション側と第2吸収器の液溜部25Bの下方に設置した液散布ポンプ6Cのポンプサクション側とを連通管15でつなぐことにより、第2吸収器の液溜部25Bがほとんど溶液がなくなった状態でも、液ポンプ6Cの空転を防止でき安定して運転をすることができる、という効果がある。
【0019】
図2は、本発明の2段2重効用吸収冷凍機に係る第2の実施例の系統図である。図1の実施例と同様の構成要素には同一符合を付けて説明は省略する。
本実施例が図1の実施例と異なるところは、第2蒸発器及び第2吸収器を第1蒸発器及び第1吸収器の上方に設置したことである。
本実施例によれば、吸収冷凍機の設置面積を小さくすることができる。
【0020】
図3は、本発明の2段2重効用吸収冷凍機に係る第3の実施例の系統図である。図1の実施例と同様の構成要素には同一符合を付けて説明は省略する。
本実施例が図1の実施例と異なるところは、図1の連通管15に代えて、第2吸収器の液溜部25Bに液面検出手段40を配置し、所定の液面以上にあるように溶液散布ポンプ6Bを制御するものである。
本実施例によれば、溶液循環ポンプ6Cの空転を防止し、安定した運転をすることができる。
【0021】
図4は、本発明の2段2重効用吸収冷凍機に係る第4の実施例の系統図である。図1の実施例と同様の構成要素には同一符合を付けて説明は省略する。
本実施例が図1の実施例と異なるところは、図1の溶液導管15に代えて、第2吸収器の液溜部25Bに液面検出手段40を配置し、液面が所定の位置以下になったことを検出すると溶液循環ポンプ6Cを停止させるものである。
本実施例によれば、溶液循環ポンプ6Cの空転を防止し、安定した運転をすることができる。
【0022】
【発明の効果】
以上説明したように、本発明によれば、希溶液を主として保有する液溜部を、第1吸収器の液溜部にすることができ、濃度を中間濃度で保有することができるのでサイクル運転範囲に応じて冷媒保有量を少なくでき、このため、機器を小型化でき、原価低減を図ることができる2段2重効用吸収冷凍機を提供することができる。
また、本発明によれば、冷媒保有量を低減できるので、負荷応答性が良好になり、サイクルの安定を早めることができる2段2重効用吸収冷凍機を提供できる。
【図面の簡単な説明】
【図1】本発明の2段2重効用吸収冷凍機に係る第1の実施例の系統図である。
【図2】本発明の2段2重効用吸収冷凍機に係る第2の実施例の系統図である。
【図3】本発明の2段2重効用吸収冷凍機に係る第3の実施例の系統図である。
【図4】本発明の2段2重効用吸収冷凍機に係る第3の実施例の系統図である。
【符号の説明】
1A…高温再生器、1B…低温再生器
2…凝縮器
3A…第1蒸発器、3B…第2蒸発器
4A…第1吸収器、4B…第2吸収器
5A…高温液熱交換器、5B…中温液熱交換器、5C…低温液熱交換器
6A…溶液散布ポンプ、6B…溶液散布ポンプ、6C…溶液循環ポンプ
7A…冷媒散布ポンプ、7B…混合冷媒散布ポンプ
8A…冷媒溜部、8B…混合冷媒溜部
10、11…冷媒導管
12…濃溶液導管
13…希溶液導管
14…溶液導管
15…連通管
18…冷媒流量制御手段
24…濃度検出器
25A…第1吸収器の液溜部、25B…第2吸収器の液溜部
27…循環水ポンプ
28…液面検出器
29…液流抽気手段
30A、30B、31A、31B、32…伝熱管
33…配管
34…溶液流量制御手段
35…フィルタ
36…銅イオン除去手段
40…液面検出器
HA、HB…伝熱面
CW…冷却水
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a two-stage double-effect absorption refrigerator that uses a water refrigerant used for refrigeration and air conditioning and an aqueous salt solution as an absorbent, and particularly suitable for low-temperature use of about 3 ° C to -10 ° C. The present invention relates to a double effect absorption refrigerator.
[0002]
[Prior art]
The two-stage double effect absorption refrigerator includes a high temperature regenerator, a low temperature regenerator, a condenser, a first evaporator, a first absorber, a second evaporator, a second absorber, a liquid heat exchanger, a solution circulation pump, A refrigerant pump, solution spray pump, etc. are operatively connected to the pipe. When the diluted solution of the first or second absorber is concentrated, it is concentrated in a double effect absorption refrigeration cycle of a high temperature regenerator and a low temperature regenerator. ing. Here, the second absorber operates at a lower pressure than the first absorber, and the second evaporator produces cold water or brine that is cooler than the first evaporator. A two-stage double-effect absorption refrigeration cycle capable of generating a low temperature is described in, for example, Japanese Patent Application Laid-Open No. 7-139844. This is a two-stage double-effect absorption cycle having a second evaporator and a second absorber, and cooling the second absorber with a low-temperature medium generated by the first evaporator. In order to prevent the water refrigerant from freezing in the second evaporator, a mixed refrigerant in which an absorbing liquid is mixed is used. For example, Japanese Patent Publication No. 58-15703, Japanese Patent Application Laid-Open No. 7-139844, Japanese Patent Application Laid-Open No. 55-162565, Japanese Patent Application Laid-Open No. 55-162565 are disclosed as means for preventing freezing by mixing an absorbing solution into the refrigerant in the evaporator. JP-A-60-103268, JP-A-60-103269, and the like.
[0003]
[Problems to be solved by the invention]
In the above-described conventional two-stage double-effect absorption refrigerator, the arrangement relationship between the liquid reservoirs of the first absorber and the second absorber is not particularly described. Here, in the absorption refrigerator, when the liquid holding amount is increased, the refrigerant holding amount for adjusting the concentration of the absorbing liquid is increased, the volume of the refrigerant reservoir is increased, and the load response is increased. The nature is also reduced. In addition, an aqueous salt solution that is an absorbing solution, for example, a lithium bromide aqueous solution (LiBr aqueous solution), solidifies when cooled while concentrated to a high concentration. However, a cycle circulation configuration that can continue operation even in such a trouble is desired. ing.
[0004]
A first object of the present invention is to provide a two-stage double-effect absorption refrigerator that can reduce the size of the device and reduce the cost.
A second object of the present invention is to provide a two-stage double-effect absorption refrigerator that has good load responsiveness and can accelerate cycle stability.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the configuration of the two-stage double-effect absorption refrigerator according to the present invention includes a first evaporator, a first absorber, a second evaporator, a second absorber, and a solution circulation pump. In the two-stage double-effect absorption refrigerator that uses an aqueous salt solution that cools the second absorber with a cooling medium that is lower in temperature than the cooling medium that cools the first absorber, the liquid in the second absorber The reservoir is disposed above the liquid reservoir of the first absorber, and a liquid level detecting means is provided in the liquid reservoir of the second absorber, and the liquid level of the liquid reservoir of the second absorber is predetermined. When the following condition is reached, the solution circulation pump of the second absorber is stopped .
[0006]
In order to achieve the above object, another invention of a two-stage double-effect absorption refrigerator according to the present invention is such that the refrigerant of the second evaporator is a mixed refrigerant containing an absorbing liquid, and the concentration detection of the mixed refrigerant is performed. And a liquid refrigerant supply control means from the first evaporator, the liquid reservoir of the second absorber is disposed above the liquid reservoir of the first absorber, and the liquid of the second absorber A liquid level detecting means is provided in the reservoir, and the solution circulation pump of the second absorber is stopped when the liquid level of the liquid reservoir of the second absorber becomes below a predetermined level .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
FIG. 1 is a system diagram of a first embodiment according to the two-stage double-effect absorption refrigerator of the present invention. The two-stage double effect absorption refrigerator includes a high temperature regenerator 1A, a low temperature low temperature regenerator 1B, a condenser 2, a first evaporator 3A, a second evaporator 3B, a first absorber 4A, a second absorber 4B, a liquid The heat exchangers 5A, 5B, and 5C, the solution spray pumps 6A and 6B, the solution circulation pump 6C, and the like are connected by piping to form a circulation path for the refrigerant and the absorbing liquid.
[0011]
The high temperature regenerator 1A is provided with a heat transfer surface HA for heating and boiling a diluted solution having a reduced concentration by absorbing refrigerant with a combustion gas such as city gas, exhaust gas, or steam, and the low temperature regenerator 1B. Is provided with a heat transfer surface HB for heating and boiling the solution using the latent heat of condensation of the refrigerant vapor generated in the high temperature regenerator 1A as a heat source. The refrigerant vapor generated in the high temperature regenerator 1 </ b> A heats the absorption liquid of the low temperature regenerator 1 </ b> B to be condensed and liquefied to become a liquid refrigerant, and is introduced into the condenser 2. Refrigerant vapor generated in the low-temperature regenerator 1B is also introduced into the condenser 2, cooled by cooling water CW flowing from the cooling tower or the like flowing in the heat transfer surface 32, and condensed and liquefied to become liquid refrigerant.
[0012]
The liquid refrigerant generated in the condenser 2 is introduced into the refrigerant liquid reservoir 8A of the first evaporator 3A via the refrigerant conduit 10. The introduced refrigerant liquid is sprayed and evaporated on the heat transfer pipe 31A by the refrigerant spray pump 7A, and the refrigerant vapor is guided to the first absorber 4A via the eliminator. Further, the heat exchanger tube 31A of the first evaporator 3A and the heat exchanger tube 30B of the second absorber 4B are circulated so that the second absorber 4B can be cooled by the cold medium having a low temperature generated by the first evaporator 3A. Thermally connected via a water pump 27. For this reason, the heat transfer tube 30B in the second absorber 4B is cooled by the latent heat of vaporization of the low-temperature refrigerant obtained in the first evaporator 3A.
[0013]
The liquid refrigerant in the refrigerant liquid reservoir 8A of the first evaporator 3A passes through the motor operated valve 18 which is an inflow control means by the refrigerant spray pump 7A, and the pump suction side of the mixed refrigerant spray pump 7B in the mixed refrigerant liquid reservoir 8B. To be introduced. By mixing the refrigerant with the absorbing liquid on the pump suction side of the mixed refrigerant spray pump 7B having a high flow rate, both media having a difference in concentration are quickly mixed to prevent corrosion and ice formation due to concentration cell formation. Yes.
[0014]
The mixed refrigerant in the mixed refrigerant liquid reservoir 8B is sprayed and evaporated on the heat transfer pipe 31B in the second evaporator 3B by the mixed refrigerant spray pump 7B to cool water (or brine) flowing in the heat transfer pipe 31B. To do. The absorption liquid concentration in the mixed refrigerant liquid reservoir 8B is detected and calculated by the concentration detector 24 to control the opening and closing of the motor-operated valve 18. Further, the mixed refrigerant amount in the mixed refrigerant liquid reservoir 8B is detected and calculated by the liquid level detecting means 28. If it is determined that the liquid holding amount is small even though it is at an appropriate concentration, the absorbing liquid is caused by some cause. Because it is a case of spillage and shortage,
(1) A warning is displayed to replenish the absorption liquid. Alternatively, the data is communicated to the maintenance company via the communication means. Thereby, the absorbing liquid is supplied to the mixed refrigerant liquid reservoir 8B. Or
(2) Absorbing liquid, for example, a solution pipe branched from the discharge side of the solution circulation pump 6A is connected to the pump suction side of the mixed refrigerant spray pump 7B, and a solution flow rate control means 34, a filter 35, and a copper ion removal means 36 are provided on the way. It arrange | positions and replenishes absorption liquid to the mixed refrigerant liquid reservoir 8B by introduce | transducing the absorption liquid of a cycle.
[0015]
As described above, the liquid level of the mixed refrigerant liquid reservoir 8B can be properly maintained and the mixed refrigerant concentration can be appropriately maintained, so that freezing of the refrigerant and idling of the mixed refrigerant spray pump 7B can be prevented, and safety is ensured. You can continue driving.
[0016]
On the other hand, the absorption liquid concentrated by generating the refrigerant vapor in the regenerators 1A and 1B becomes a low temperature through heat exchange with the dilute solution in the solution heat exchangers 5A and 5B. It is sent to the absorber 4A and is cooled by the coolant sprayed on the heat transfer tube 30A of the first absorber 4A by the solution spray pump 6A and flowing through the tube. Along with this, the absorbing liquid absorbs the refrigerant vapor evaporated in the first evaporator 3A and becomes thin. The thinned absorption liquid of the first absorber 4A flows down the liquid reservoir 25A, and is sent to the second absorber 4B via the solution conduit 14 and the low-temperature liquid heat exchanger 5C by the solution spray pump 6B, and the heat transfer tube It is sprayed onto 30B and cooled by the latent heat of vaporization of the refrigerant from the first evaporator 3A. Further, the refrigerant vapor from the second evaporator 3B is absorbed and diluted to become a further dilute solution, which flows down the liquid extraction means 29 arranged at the lower part of the tube group of the heat transfer tubes 30B, and at that time the noncondensable gas is removed. Get involved. Further, the dilute solution is sent by the solution circulation pump 6C to the regenerators 1A and 1B via the low temperature liquid heat exchanger 5C, the dilute solution conduit 13, and the solution heat exchangers 5B and 5A.
[0017]
As described above, the two-stage double-effect absorption refrigeration cycle is configured. However, in the present embodiment, the second absorber 4B is disposed at a position higher than the first absorber 4A, so the second absorber 3B. The liquid reservoir 25B is almost free of solution under the condition that the concentration of the absorbent in the cycle during the load operation is high. This
(1) The liquid reservoir that mainly holds the dilute solution can be used as the liquid reservoir 25A of the first absorber 4A. Since the concentration of the absorption liquid in the liquid reservoir 25A is an intermediate concentration higher than that of the solution generated in the second absorber 4B, the amount of refrigerant retained is smaller than that in the liquid reservoir 25B of the second absorber 4B. Tesumu. When the temperature of water (or brine) is low or the temperature of the cooling water CW is high, the cycle is shifted to the high concentration side to increase the amount of refrigerant stored in the refrigerant liquid reservoir 8A. At that time, the amount of liquid retained in the liquid reservoir 25A is reduced to a high concentration. Of course, since the concentration of the second absorber 4B is increased and the concentration in the liquid reservoir 25B is also increased, this amount of refrigerant is also stored in the refrigerant reservoir 8A.
[0018]
For this reason, the liquid amount of the liquid reservoir 25B of the second absorber 4B is small, and the refrigerant holding amount can be reduced. Therefore, it is possible to reduce the size of the device, improve the load responsiveness, and reduce the cost. further,
(2) The pump suction side of the liquid spray pump 6B installed below the liquid reservoir 25A of the first absorber and the pump suction side of the liquid spray pump 6C installed below the liquid reservoir 25B of the second absorber By connecting with the communication pipe 15, there is an effect that the liquid pump 6C can be prevented from idling and can be stably operated even when the liquid reservoir 25B of the second absorber has almost no solution.
[0019]
FIG. 2 is a system diagram of a second embodiment according to the two-stage double-effect absorption refrigerator of the present invention. The same components as those in the embodiment of FIG.
This embodiment is different from the embodiment of FIG. 1 in that the second evaporator and the second absorber are installed above the first evaporator and the first absorber.
According to the present embodiment, the installation area of the absorption refrigerator can be reduced.
[0020]
FIG. 3 is a system diagram of a third embodiment according to the two-stage double-effect absorption refrigerator of the present invention. The same components as those in the embodiment of FIG.
The present embodiment differs from the embodiment of FIG. 1 in that the liquid level detecting means 40 is disposed in the liquid reservoir 25B of the second absorber instead of the communication pipe 15 of FIG. Thus, the solution spray pump 6B is controlled.
According to this embodiment, the idling of the solution circulation pump 6C can be prevented and a stable operation can be performed.
[0021]
FIG. 4 is a system diagram of a fourth embodiment according to the two-stage double-effect absorption refrigerator of the present invention. The same components as those in the embodiment of FIG.
The present embodiment differs from the embodiment of FIG. 1 in that the liquid level detecting means 40 is disposed in the liquid reservoir 25B of the second absorber instead of the solution conduit 15 of FIG. When it is detected that the liquid circulation pump 6C has been detected, the solution circulation pump 6C is stopped.
According to this embodiment, the idling of the solution circulation pump 6C can be prevented and a stable operation can be performed.
[0022]
【The invention's effect】
As described above, according to the present invention, the liquid reservoir mainly holding the dilute solution can be used as the liquid reservoir of the first absorber, and the concentration can be held at an intermediate concentration. A refrigerant holding amount can be reduced according to the range, and therefore a two-stage double-effect absorption refrigerator that can reduce the size of the device and can reduce the cost can be provided.
In addition, according to the present invention, since the refrigerant holding amount can be reduced, it is possible to provide a two-stage double-effect absorption refrigerator that can improve load response and accelerate cycle stability.
[Brief description of the drawings]
FIG. 1 is a system diagram of a first embodiment according to the two-stage double-effect absorption refrigerator of the present invention.
FIG. 2 is a system diagram of a second embodiment according to the two-stage double-effect absorption refrigerator of the present invention.
FIG. 3 is a system diagram of a third embodiment according to the two-stage double-effect absorption refrigerator of the present invention.
FIG. 4 is a system diagram of a third embodiment according to the two-stage double-effect absorption refrigerator of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1A ... High temperature regenerator, 1B ... Low temperature regenerator 2 ... Condenser 3A ... 1st evaporator, 3B ... 2nd evaporator 4A ... 1st absorber, 4B ... 2nd absorber 5A ... High temperature liquid heat exchanger, 5B ... medium temperature liquid heat exchanger, 5C ... low temperature liquid heat exchanger 6A ... solution spray pump, 6B ... solution spray pump, 6C ... solution circulation pump 7A ... refrigerant spray pump, 7B ... mixed refrigerant spray pump 8A ... refrigerant reservoir, 8B ... mixed refrigerant reservoirs 10, 11 ... refrigerant conduit 12 ... concentrated solution conduit 13 ... dilute solution conduit 14 ... solution conduit 15 ... communication pipe 18 ... refrigerant flow rate control means 24 ... concentration detector 25A ... liquid reservoir of the first absorber 25B ... Second absorber liquid reservoir 27 ... Circulating water pump 28 ... Liquid level detector 29 ... Liquid flow extraction means 30A, 30B, 31A, 31B, 32 ... Heat transfer pipe 33 ... Pipe 34 ... Solution flow rate control means 35 ... Filter 36 ... Copper ion removal means 40 ... Liquid level inspection Vessels HA, HB ... heat transfer surfaces CW ... cooling water

Claims (2)

  1. 第1蒸発器、第1吸収器、第2蒸発器、第2吸収器、溶液循環ポンプを有し、前記第1吸収器を冷却する冷熱媒体よりも低温の冷熱媒体で第2吸収器を冷却する塩類水溶液を吸収液とする2段2重効用吸収冷凍機において、
    前記第2吸収器の液溜部を第1吸収器の液溜部よりも上部に配置すると共に、
    前記第2吸収器の液溜部に液面検出手段を設け、前記第2吸収器の液溜部の液面が所定以下になったとき前記第2吸収器の溶液循環ポンプを停止させることを特徴とする2段2重効用吸収冷凍機。
    A first evaporator, a first absorber, a second evaporator, a second absorber, and a solution circulation pump are provided, and the second absorber is cooled by a cooling medium that is lower in temperature than the cooling medium that cools the first absorber. In a two-stage double-effect absorption refrigerator using an aqueous salt solution as an absorbent,
    While disposing the liquid reservoir of the second absorber above the liquid reservoir of the first absorber ,
    A liquid level detecting means is provided in the liquid reservoir of the second absorber, and the liquid circulation pump of the second absorber is stopped when the liquid level of the liquid reservoir of the second absorber becomes below a predetermined level. A featured two-stage double-effect absorption refrigerator.
  2. 第1蒸発器、第1吸収器、第2蒸発器、第2吸収器、溶液循環ポンプを有し、前記第1吸収器を冷却する冷熱媒体よりも低温の冷熱媒体で第2吸収器を冷却する塩類水溶液を吸収液とする2段2重効用吸収冷凍機において、
    前記第2蒸発器の冷媒が吸収液を含む混合冷媒であって、該混合冷媒の濃度検出手段、第1蒸発器からの液冷媒供給制御手段を有し、
    前記第2吸収器の液溜部を第1吸収器の液溜部よりも上部に配置すると共に、
    前記第2吸収器の液溜部に液面検出手段を設け、前記第2吸収器の液溜部の液面が所定以下になったとき前記第2吸収器の溶液循環ポンプを停止させることを特徴とする2段2重効用吸収冷凍機。
    A first evaporator, a first absorber, a second evaporator, a second absorber, and a solution circulation pump are provided, and the second absorber is cooled by a cooling medium that is lower in temperature than the cooling medium that cools the first absorber. In a two-stage double-effect absorption refrigerator using an aqueous salt solution as an absorbent,
    The refrigerant of the second evaporator is a mixed refrigerant containing an absorption liquid, and has concentration detecting means for the mixed refrigerant, liquid refrigerant supply control means from the first evaporator,
    While disposing the liquid reservoir of the second absorber above the liquid reservoir of the first absorber ,
    A liquid level detecting means is provided in the liquid reservoir of the second absorber, and the liquid circulation pump of the second absorber is stopped when the liquid level of the liquid reservoir of the second absorber becomes below a predetermined level. A featured two-stage double-effect absorption refrigerator.
JP32931199A 1999-11-19 1999-11-19 2-stage double-effect absorption refrigerator Expired - Fee Related JP3715157B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102410575A (en) * 2011-10-18 2012-04-11 李华玉 Absorption type grading heat supply system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104930747B (en) * 2015-07-09 2018-02-23 荏原冷热系统(中国)有限公司 A kind of second-kind absorption-type heat pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102410575A (en) * 2011-10-18 2012-04-11 李华玉 Absorption type grading heat supply system
CN102410575B (en) * 2011-10-18 2014-06-25 李华玉 Absorption type grading heat supply system

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