JPH0660303B2 - Absorption liquid for absorption refrigerator - Google Patents
Absorption liquid for absorption refrigeratorInfo
- Publication number
- JPH0660303B2 JPH0660303B2 JP1313635A JP31363589A JPH0660303B2 JP H0660303 B2 JPH0660303 B2 JP H0660303B2 JP 1313635 A JP1313635 A JP 1313635A JP 31363589 A JP31363589 A JP 31363589A JP H0660303 B2 JPH0660303 B2 JP H0660303B2
- Authority
- JP
- Japan
- Prior art keywords
- absorption
- absorption liquid
- copper
- liquid
- steel
- 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.)
- Expired - Lifetime
Links
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- Sorption Type Refrigeration Machines (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Description
【発明の詳細な説明】 (イ)産業上の利用分野 本発明は、臭化リチウム水溶液を主成分とする吸収冷凍
機用吸収液に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an absorption liquid for an absorption refrigerator, which contains an aqueous lithium bromide solution as a main component.
(ロ)従来の技術 吸収液として使用される臭化リチウム水溶液は腐食性が
強いため、吸収冷凍機の構成材料の腐食防止が重要であ
る。そして、吸収冷凍機は一般に鋼ないし鋼合金、又は
銅ないし銅合金によって構成され、これら材料の腐食抑
制のために、例えば特開昭６４−９２３８６号公報に示
されているように、若干量のアルカリ金属の水酸化物と
微量のモリブデン酸塩、及び硝酸塩を吸収冷凍機用吸収
液に添加する。(B) Conventional technology Since the lithium bromide aqueous solution used as the absorbing liquid is highly corrosive, it is important to prevent the constituent materials of the absorption refrigerator from being corroded. The absorption refrigerator is generally made of steel or a steel alloy, or copper or a copper alloy. To prevent corrosion of these materials, for example, as shown in Japanese Patent Laid-Open No. 64-92386, some amount of refrigeration is used. Add alkali metal hydroxide, a trace amount of molybdate, and nitrate to the absorption liquid for absorption refrigerator.
(ハ)発明が解決しようとする課題 上記のように吸収液にアルカリ金属の水酸化物を添加し
た場合、アルカリ金属の水酸化物は高温濃厚吸収液中に
おいて銅に対してはその腐食抑制力が充分でない。又、
現在広く使われている腐食抑制剤は無機系のものが中心
で、そのほとんどがクロム酸塩や硝酸塩、モリブデン塩
のような酸化剤である。しかしながら、銅は強い酸化剤
または酸化性の塩を含む環境では耐食性能が充分でない
という問題があった。(C) Problems to be Solved by the Invention When an alkali metal hydroxide is added to the absorbing solution as described above, the alkali metal hydroxide has a corrosion inhibiting power against copper in the high temperature concentrated absorbing solution. Is not enough. or,
The most widely used corrosion inhibitors are inorganic ones, most of which are oxidizers such as chromate, nitrate and molybdenum. However, there is a problem that copper has insufficient corrosion resistance in an environment containing a strong oxidizing agent or oxidizing salt.
本発明は、鋼に対して腐食抑制の効果があり、かつ銅の
腐食に影響が少ない吸収冷凍機用吸収液を提供すること
を目的とする。An object of the present invention is to provide an absorption liquid for an absorption refrigerating machine, which has an effect of suppressing corrosion on steel and has little influence on corrosion of copper.
(ニ)課題を解決するための手段 本発明は上記課題を解決するために、臭化リチウム水溶
液を主成分とし、モリブデン酸塩を添加した吸収冷凍機
用吸収液において、吸収液の塩基規定度が０．０２〜
０．１０Ｎである吸収冷凍機用吸収液を提供するもので
ある。(D) Means for Solving the Problems The present invention, in order to solve the above problems, has an aqueous solution of lithium bromide as a main component, in an absorption liquid for an absorption refrigerating machine to which molybdate is added, and a base normality of the absorption liquid. Is 0.02-
An absorption liquid for an absorption refrigerator that is 0.10 N is provided.
又、臭化リチウム水溶液を吸収液とし、この吸収液と接
触する再生凝縮胴(A)、蒸発吸収胴(B)、又は高温再生器
(1)などに鋼ないし鋼合金が使用され、吸収器熱交換器
(13)の伝熱管などに銅ないし銅合金が使われている吸収
冷凍機において、腐食防止剤としてモリブデン酸のアル
カリ金属塩を０．００５〜０．３wt％添加し、かつ塩基
規定度を０．０２〜０．１０Ｎにした吸収冷凍機用吸収
液を提供するものである。In addition, a lithium bromide aqueous solution is used as an absorption liquid, and a regenerative condensation cylinder (A), an evaporation absorption cylinder (B), or a high-temperature regenerator that comes into contact with this absorption liquid.
(1) Steel or steel alloy is used for the absorber heat exchanger
In an absorption refrigerator using copper or a copper alloy for the heat transfer tube of (13), 0.005 to 0.3 wt% of an alkali metal salt of molybdic acid is added as a corrosion inhibitor, and the basic normality is 0. The absorption liquid for absorption chillers set to 0.02 to 0.10 N is provided.
(ホ)作用 吸収液にモリブデン酸塩を添加し、かつ、アルカリ規定
度を０．０２〜０．１０Ｎに制限することにより、吸収
冷凍機を構成する鋼の腐食抑制を図ることができるとと
もに、吸収液が接触する吸収器熱交換器(13)に銅を使用
した場合にも、銅の腐食抑制力を低下させることを防止
でき、吸収冷凍機を長期にわたり使用することが可能に
なる。(E) Action By adding molybdate to the absorption liquid and limiting the alkali normality to 0.02 to 0.10 N, it is possible to prevent corrosion of the steel constituting the absorption refrigerator, Even when copper is used for the absorber heat exchanger (13) with which the absorbing liquid comes into contact, it is possible to prevent the corrosion inhibiting power of copper from being lowered, and it is possible to use the absorption refrigerator for a long period of time.
又、吸収液にモリブデン酸のアルカリ金属を０．００５
〜０．３wt％添加し、塩基規定度を０．０２〜０．１０
Ｎにすることにより、吸収液と接触する再生凝縮胴
(A)、又は蒸発吸収胴(B)などに使用されている鋼ないし
鋼合金の腐食抑制を図るとともに、吸収器熱交換器(13)
に使用されている銅ないし銅合金の腐食抑制力が低下す
ることを防止して銅などの腐食減量を僅かに抑えること
が可能になり、この結果、吸収冷凍機を長期間にわたり
使用することが可能になる。In addition, 0.005 of alkali metal molybdate was added to the absorption liquid.
~ 0.3wt% addition, base normality 0.02-0.10
Regeneration condensing cylinder that comes into contact with absorbing liquid by changing to N
(A), or evaporation absorber (B) and the like, while aiming to suppress corrosion of steel or steel alloys, absorber heat exchanger (13)
It is possible to prevent the reduction of the corrosion inhibiting power of the copper or copper alloy used in the above, and to slightly suppress the corrosion weight loss of copper, etc. As a result, it is possible to use the absorption refrigerator for a long period of time. It will be possible.
(ヘ)実施例 以下、本発明の実施例を図面に基づいて詳細に説明す
る。(F) Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
第１図は冷媒に水(H2O)、吸収液に臭化リチウム(LiBr)
水溶液を主成分として使用した吸収冷凍機である。Figure 1 shows water (H 2 O) as the refrigerant and lithium bromide (LiBr) as the absorbing liquid.
It is an absorption refrigerator that uses an aqueous solution as a main component.
第１図において、(1)は高温再生器、(A)は再生凝縮胴、
(2)は低温再生器、(3)は凝縮器、(B)は蒸発吸収胴、(4)
は蒸発器、(5)は吸収器、(6)及び(7)はそれぞれ高温熱
交換器及び低温熱交換器であり、それぞれは配管接続さ
れている。又、(10)は冷水管であり、この冷水管(10)の
途中に蒸発器熱交換器(11)が接続されている。さらに、
(12)は冷却水管であり、この冷却水管(12)の途中に吸収
器熱交換器(13)及び凝縮器熱交換器(14)が接続されてい
る。そして、各熱交換器(13)，(14)には多数の伝熱管
（図示せず）が設けられている。又、(15)は冷媒液ポン
プ、(16)は吸収液ポンプである。In FIG. 1, (1) is a high temperature regenerator, (A) is a regenerating condenser cylinder,
(2) is a low temperature regenerator, (3) is a condenser, (B) is an evaporative absorber, (4)
Is an evaporator, (5) is an absorber, and (6) and (7) are a high temperature heat exchanger and a low temperature heat exchanger, respectively, which are connected by pipes. Further, (10) is a cold water pipe, and an evaporator heat exchanger (11) is connected in the middle of this cold water pipe (10). further,
Reference numeral (12) is a cooling water pipe, and an absorber heat exchanger (13) and a condenser heat exchanger (14) are connected in the middle of the cooling water pipe (12). Each heat exchanger (13), (14) is provided with a large number of heat transfer tubes (not shown). Further, (15) is a refrigerant liquid pump, and (16) is an absorption liquid pump.
又、上記の吸収冷凍機において、再生凝縮胴(A)、蒸発
吸収胴(B)、及び高温再生器(1)などには鋼ないし鋼合金
が使用されており、蒸発器熱交換器(11)、吸収器熱交換
器(13)、及び凝縮器熱交換器(14)の伝熱管には銅ないし
銅合金の管が使用されている。Further, in the above absorption refrigerator, steel or steel alloy is used for the regenerating condenser cylinder (A), the evaporative absorption cylinder (B), the high temperature regenerator (1), etc., and the evaporator heat exchanger (11 ), The absorber heat exchanger (13), and the condenser heat exchanger (14) are made of copper or copper alloy.
上記吸収冷凍機の運転時には、従来の吸収冷凍機と同様
に冷媒及び吸収液が循環し、蒸発器(4)から負荷へ冷水
が供給される。During operation of the absorption refrigerator, the refrigerant and the absorption liquid circulate as in the conventional absorption refrigerator, and cold water is supplied from the evaporator (4) to the load.
又、吸収液にはクロム酸塩などの強い酸化剤に比べ酸化
力が弱い、例えばモリブデン酸リチウム(Li2M0O4)など
のモリブデン酸塩が０．００５〜０．３wt％添加されて
いる。さらに、鋼の腐食抑制のために、水酸化リチウム
(LiOH)などの水酸化アルカリ金属が吸収液に添加され、
吸収液の塩基規定度は０．０２Ｎ以上０．１０Ｎ以下に
されている。ここで、モリブデン酸リチウムの他にモリ
ブデン酸ナトリウム(Na2M0O4)、或いはモリブデン酸カ
リウム(K2M0O4)などを使用しても良い。In addition, the absorbing liquid has a weaker oxidizing power than a strong oxidizing agent such as chromate, for example, 0.005-0.3 wt% of molybdate such as lithium molybdate (Li 2 M 0 O 4 ) is added. There is. In addition, lithium hydroxide is used to control the corrosion of steel.
Alkali metal hydroxide such as (LiOH) is added to the absorption liquid,
The base normality of the absorbing liquid is set to 0.02N or more and 0.10N or less. Here, in addition to lithium molybdate, sodium molybdate (Na 2 M 0 O 4 ) or potassium molybdate (K 2 M 0 O 4 ) may be used.
第２図は、臭化リチウム濃度が５５％、試験温度が８０
℃、モリブデン酸リチウムの添加量が２６３mg／の吸
収液における試験時間１６日間のアルカリ規定度と、銅
及び鋼の腐食減量との関係の試験結果であり、実線は銅
の試験結果、破線は鋼の試験結果である。第２図から明
らかなように、鋼についてはアルカリ規定度（塩基規定
度）が０．０２Ｎ（Ｎは規定を表わす記号である。）以
上の場合には腐食減量が５Mg／CM2以下であり腐食抑制
効果が見られる。又、銅についてはアルカリ規定度が高
くなるのにしたがい腐食減量が増加し、アルカリ規定度
が０．１０Ｎより高くなると腐食減量が急激に増加して
５Mg／CM2を超える。このため、吸収液のアルカリ規定
度が０．０２〜０．１０Ｎの範囲に収まるように水酸化
リチウムの吸収液への添加量が制限される。FIG. 2 shows that the concentration of lithium bromide is 55% and the test temperature is 80.
℃, the test results of the relationship between the alkali normality of the test solution for 16 days in the absorbing solution with the addition amount of lithium molybdate of 263 mg /, and the corrosion weight loss of copper and steel, the solid line is the copper test result, and the broken line is the steel Is the test result of. As is clear from FIG. 2, when the alkali normality (base normality) of the steel is 0.02 N (N is a symbol representing the standard) or more, the corrosion weight loss is 5 Mg / CM 2 or less. A corrosion inhibition effect is seen. With respect to copper, the corrosion weight loss increases as the alkali normality increases, and when the alkali normality exceeds 0.10 N, the corrosion weight loss sharply increases and exceeds 5 Mg / CM 2 . Therefore, the amount of lithium hydroxide added to the absorbing solution is limited so that the alkali normality of the absorbing solution falls within the range of 0.02 to 0.10N.
上記のようにモリブデン酸塩が添加されアルカリ規定度
が０．０２〜０．１０Ｎの範囲の吸収液を吸収冷凍機に
使用することにより、蒸発吸収胴(B)、及び高温再生器
(1)などの鋼の腐食抑制を図ることができるとともに、
吸収液が接触する吸収器熱交換器(13)などの銅管のアル
カリによる腐食減量を僅かに抑えることができ、この結
果、鋼ないし鋼合金、及び銅ないし銅合金が使用された
吸収冷凍機を長期間にわたり使用することができる。As described above, by using the absorbing liquid containing molybdate and having an alkali normality in the range of 0.02 to 0.10N in the absorption refrigerator, the evaporation absorber (B) and the high temperature regenerator are used.
In addition to being able to suppress corrosion of steel such as (1),
It is possible to slightly suppress the corrosion weight loss due to alkali of copper pipes such as absorber heat exchangers (13) with which the absorbing liquid comes into contact, and as a result, steel or steel alloys, and absorption refrigerators using copper or copper alloys Can be used for a long period of time.
(ト)発明の効果 本発明は以上のように構成された吸収冷凍機用吸収液で
あり、臭化リチウム水溶液にモリブデン酸塩を添加した
吸収冷凍機用吸収液のアルカリ規定度を０．０２〜０．
１０Ｎにしたので、吸収冷凍機に使用された銅の腐食抑
制力を大幅に低下させることなく鋼の腐食抑制を図るこ
とができ、実用性に優れた吸収冷凍機用吸収液を提供す
ることができる。(G) Effect of the Invention The present invention is an absorption liquid for an absorption refrigeration machine configured as described above, and an absorption normality of the absorption liquid for an absorption refrigeration device obtained by adding molybdate to an aqueous solution of lithium bromide is 0.02. ~ 0.
Since it is set to 10 N, it is possible to achieve corrosion inhibition of steel without significantly reducing the corrosion inhibition power of copper used in the absorption refrigerator, and to provide an absorption liquid for an absorption refrigerator having excellent practicability. it can.
又、吸収冷凍機用吸収液に腐食防止剤としてモリブデン
酸のアルカリ金属塩を０．００５〜０．３wt％添加する
とともに、吸収液のアルカリ規定度を０．０２〜０．１
０Ｎにすることにより、吸収冷凍機に使用された銅ない
し銅合金の優れた腐食抑制力を利用しつつモリブデン酸
のアルカリ金属塩により鋼ないし鋼合金の腐食抑制を図
ることができる吸収冷凍機用吸収液を提供することがで
きる。Further, 0.005 to 0.3 wt% of an alkali metal salt of molybdic acid is added to the absorption liquid for the absorption refrigerator as a corrosion inhibitor, and the alkali normality of the absorption liquid is 0.02 to 0.1%.
By setting it to 0 N, for the absorption refrigerating machine, it is possible to suppress corrosion of steel or steel alloy by alkali metal salt of molybdic acid while utilizing the excellent corrosion suppressing power of copper or copper alloy used in the absorption refrigerating machine. An absorbing liquid can be provided.
第１図及び第２図は本発明の一実施例を示し、第１図は
吸収冷凍機の回路構成図、第２図は鋼及び銅についての
アルカリ規定度と腐食減量との関係図である。 (1)…高温再生器、(B)…蒸発吸収胴、(13)…吸収器熱交
換器。1 and 2 show an embodiment of the present invention, FIG. 1 is a circuit configuration diagram of an absorption refrigerator, and FIG. 2 is a relationship diagram between alkali normality and corrosion weight loss for steel and copper. . (1) ... High temperature regenerator, (B) ... Evaporative absorber, (13) ... Absorber heat exchanger.
Claims (2)
デン酸塩を添加した吸収冷凍機用吸収液において、吸収
液の塩基規定度が０．０２〜０．１０Ｎであることを特
徴とする吸収冷凍機用吸収液。1. An absorption liquid for an absorption refrigerating machine containing an aqueous solution of lithium bromide as a main component and containing molybdate, wherein the absorption liquid has a base normality of 0.02 to 0.10 N. Absorption liquid for refrigerator.
収液と接触する構成材料に鋼ないし鋼合金と銅ないし銅
合金との双方が一部ないし全部に使われる吸収冷凍機に
おいて、腐食防止剤としてモリブデン酸のアルカリ金属
塩を０．００５〜０．３wt％添加し、かつ、塩基規定度
を０．０２〜０．１０Ｎにしたことを特徴とする吸収冷
凍機用吸収液。2. Corrosion prevention in an absorption refrigerating machine, wherein an aqueous solution of lithium bromide is used as an absorption liquid, and steel or steel alloys and / or copper or copper alloys are partially or entirely used as constituent materials in contact with the absorption liquid. An absorption liquid for an absorption refrigerating machine, which comprises adding an alkali metal salt of molybdic acid as an agent in an amount of 0.005 to 0.3 wt% and having a base normality of 0.02 to 0.10N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1313635A JPH0660303B2 (en) | 1989-12-01 | 1989-12-01 | Absorption liquid for absorption refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1313635A JPH0660303B2 (en) | 1989-12-01 | 1989-12-01 | Absorption liquid for absorption refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03174487A JPH03174487A (en) | 1991-07-29 |
| JPH0660303B2 true JPH0660303B2 (en) | 1994-08-10 |
Family
ID=18043693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1313635A Expired - Lifetime JPH0660303B2 (en) | 1989-12-01 | 1989-12-01 | Absorption liquid for absorption refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0660303B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5547600A (en) * | 1995-05-05 | 1996-08-20 | Carrier Corporation | Absorption refrigeration system working fluid with molybdate, borate, silicate inhibitor blend |
| JP3593268B2 (en) * | 1997-10-24 | 2004-11-24 | 荏原冷熱システム株式会社 | Absorption refrigerator and method for forming initial anticorrosion film |
| JP2016057046A (en) * | 2014-09-12 | 2016-04-21 | 大阪瓦斯株式会社 | Absorbent for absorption type refrigeration machine, absorption type refrigeration machine and operation method of absorption type refrigeration machine |
-
1989
- 1989-12-01 JP JP1313635A patent/JPH0660303B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03174487A (en) | 1991-07-29 |
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