JP4186472B2 - Refrigerator system refrigerant replacement method, iron chloride removal apparatus and refrigerator system - Google Patents

Description

【００３５】
実施例２．
実施例２では、実施の形態１で説明した塩化鉄除去装置を用いて、塩化鉄の除去を行った結果を説明する。
表２は、鉱油濃度が４０％、２０％、１０％のエステル油を上記実施の形態１の処理を施したときのエステル油中の鉱油濃度及び塩化鉄濃度を調べた結果をまとめたものである。鉱油は日本サン石油社製ＳＵＮＩＳＯ３ＧＳＤ（商品名）、エステル油はヒンダードエステルである。吸着材としては、硝酸銀を担持したゼオライトを用いた。
鉱油の初期濃度が４０％のエステル油の場合（条件１）、２相分離した後、下相であるＨＦＣ系冷媒の相に含まれるエステル油には２５〜２７％の鉱油が含まれていた。このＨＦＣ系冷媒の相をゼオライト処理することにより、エステル油中の鉱油濃度は２５〜２７％、塩化鉄濃度は１０ｐｐｍ以下となった。同様に鉱油の初期濃度が２０％のエステル油の場合（条件２）、鉱油の初期濃度が１０％のエステル油の場合（条件３）もＨＦＣ系冷媒の相に含まれるエステル油には、それぞれ１１〜１２％、４〜７％の鉱油が含まれていた。このＨＦＣ系冷媒の相を活性炭処理することにより、エステル油中の鉱油濃度は、それぞれ１１〜１２％、４〜７％となり、塩化鉄濃度は、いずれも１０ｐｐｍ以下となった。
このように、実施の形態１の塩化鉄除去装置を用い、吸着材として、硝酸銀を担持したゼオライトを用いることにより、エステル油中の塩化鉄を除去できることを確認できた。
【００３６】
【表２】

【００３７】
実施例３．
実施例３では、実施の形態２で説明した塩化鉄除去装置を用いて、塩化鉄の除去を行った結果を説明する。
表３は、塩化鉄濃度が１０００ｐｐｍのエステル油を含み、鉱油を含まないＨＣＦ系冷媒を上記実施の形態２の処理を施したときのエステル油中の塩化鉄濃度を調べた結果をまとめたものである。エステル油はヒンダードエステルである。
銀イオンを担持した吸着材として、硝酸銀を担持した活性炭を用いた場合（条件１）、処理後のエステル油中の塩化鉄濃度は１０ｐｐｍ以下であった。吸着材としては、硝酸銀を担持したゼオライトを用いた場合（条件２）、処理後のエステル油中の塩化鉄濃度は２２０ｐｐｍであった。
このように、実施の形態２の塩化鉄除去装置を用いても、エステル油中の塩化鉄を除去できることを確認できた。
【００３８】
【表３】

【００３９】
【発明の効果】
この発明に係る冷凍機システムの冷媒置換方法は、冷凍機システム内に充填された塩素系冷媒用潤滑油を含む塩素系冷媒を、非塩素系冷媒潤滑油を含む非塩素系冷媒に置換する際に、冷凍機システム内に残留する塩化鉄を除去することができる。
【００４０】
また吸着材が、銀イオンを担持するゼオライトであるので、冷凍機システム内に残留する塩化鉄を効率よく除去することができる。
【００４１】
また吸着材が、銀イオンを担持する活性炭であるので、冷凍機システム内に残留する塩化鉄を効率よく除去することができるとともに塩素系冷媒用潤滑油も効率よく除去することができる。
【００４２】
この発明に係る塩化鉄除去装置は、冷媒中の塩化鉄を除去することができる。
【００４３】
この発明に係る冷凍機システムは、冷凍機システムに充填された冷媒中の塩化鉄を除去することができる。このため冷凍機システム内で潤滑油が塩化鉄によって劣化するという問題を防ぐことができ、飛躍的に冷凍機システムの信頼性を向上することができる。
【図面の簡単な説明】
【図１】 この発明の実施の形態１の塩化鉄除去装置の構成を説明する図である。
【図２】 この発明の実施の形態２の塩化鉄除去装置の構成を説明する図である。
【図３】 従来の冷凍機システムの冷媒置換方法を説明する図である。
【符号の説明】
２１ 冷媒導入口、２２ 冷媒回収容器、２６，３３ 吸着材。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a refrigerant replacement method, an iron chloride removal device, and a refrigerator system for a refrigerator system, and in particular, replaces the refrigerant in the refrigerator system from a chlorine-based refrigerant containing chlorine to a non-chlorine-based refrigerant not containing chlorine. The present invention relates to a method for removing iron chloride remaining in the refrigerator system.
[0002]
[Prior art]
From the viewpoint of protecting the global environment, non-chlorine containing no chlorine from chlorofluorocarbon refrigerants (hereinafter referred to as CFC refrigerants) and hydrochlorofluorocarbon refrigerants (hereinafter referred to as HCFC refrigerants), which are chlorine-containing refrigerants. Substitution of hydrofluorocarbons, which are system refrigerants, to refrigerants (hereinafter referred to as HFC refrigerants) is underway. In air conditioners for buildings, etc., pipes that circulate refrigerant are often embedded in the walls and ceilings of buildings, and existing pipes are used after replacement with HFC refrigerants for alternative demand for air conditioners. It is expected that there will be many cases.
[0003]
In a refrigerator system using a CFC refrigerant or an HCFC refrigerant, mineral oil has been used as a lubricating oil for a chlorine refrigerant that is compatible with these chlorine refrigerants. However, mineral oil is not compatible with HFC refrigerants, and after replacing CFC refrigerant or HCFC refrigerant with HFC refrigerant, the mineral oil remaining in the refrigerator system is mixed in the HFC refrigerant. This causes problems such as lowering the cooling efficiency due to lubricating oil adhering to the evaporator.
[0004]
As a method for preventing the mineral oil from being mixed into the HFC-based refrigerant, for example, it is disclosed in JP-A-6-249551. FIG. 3 is a diagram for explaining a refrigerant replacement method of a conventional refrigerator system disclosed in Japanese Patent Laid-Open No. 6-249551. In FIG. 3, 1 is a compressor, 2 is a condenser, 3 is a receiver dryer, 4 is an expansion valve, 5 is an evaporator, and 6 is a circulation pipe for connecting these components. 7 is a high-pressure side service port provided between the receiver dryer 3 and the expansion valve 4, 8 is a low-pressure side service port provided between the evaporator 5 and the compressor 1, and 9 is a high-pressure side service port 7. It is a separator provided between the low-pressure side service ports 8. The separator 9 is connected to a low-pressure service port 8 by a separation pipe 9b connected by piping through a valve 9a, a drain 9d connected by way of a valve 9c, and a separation pipe 9b and a valve 9e. And the evaporator 9f.
Usually, the refrigerant and the lubricating oil are circulated through the circulation pipe 6 in the order of the compressor 1, the condenser 2, the receiver dryer 3, the expansion valve 4, the evaporator 5, and the compressor 1.
[0005]
The refrigerant replacement method of this conventional refrigerator system separates mineral oil and ester oil by utilizing the difference in solubility between mineral oil and ester oil in the HFC refrigerant. CFC-based refrigerant and HCFC-based refrigerant are recovered from the high-pressure side service port 7, then the inside of the circulation pipe 6 is evacuated by a vacuum pump, and ester oil, which is lubricating oil for HFC-type refrigerant, is injected from the low-pressure side service port 8. Further, after the HFC refrigerant is injected, the operation is performed, and the white phase is recovered in the separation pipe 9b by operating the valve 9a, and the lower phase separated into two phases is opened from the low pressure service port 8 through the evaporator 9f by opening the valve 9e. In this method, the oil is returned to the pipe 6 and the mineral oil contained in the upper phase is recovered and discarded in the drain 9d by opening the valve 9c.
[0006]
In addition, as a method for removing residues mainly of mineral oil remaining in existing pipes by cleaning, for example, in JP-A-10-339526, a compressor, an outdoor heat exchanger, an expansion mechanism, an indoor heat exchanger, and four-way switching Refrigerator system using HCFC refrigerant composed of valves and mineral oil or alkylbenzene, refrigeration system using polyvinyl ether oil and HFC refrigerant better in compatibility with nonpolar mineral oil or alkylbenzene oil than ester oil In the case of retrofitting, a method of removing mineral oil or alkylbenzene oil by using low-viscosity polyvinyl ether oil as flushing oil is described.
In addition, generally, there can be considered a method of cleaning / recovering the residue remaining in the existing piping with a cleaning agent such as trichlorethylene, alcohol cleaning agent, or liquid refrigerant.
[0007]
[Problems to be solved by the invention]
However, attention has been paid to the removal of mineral oil in the recovery of the residue remaining in the existing piping in response to an alternative demand for the refrigerator system, but attention has not been paid to the removal of iron chloride.
In a refrigerator system using a CFC-based refrigerant or an HCFC-based refrigerant, a chlorine compound contained in the refrigerant reacts with iron used as a material for the sliding portion to form iron chloride. When replacing CFC refrigerant or HCFC refrigerant with HFC refrigerant, if iron chloride remains in the existing piping, iron chloride acts as a Lewis acid and is mixed with HFC refrigerant. There is a problem in that the deterioration of the lubricating oil proceeds remarkably and the lubricating performance is lowered.
[0008]
In the method for separating and removing mineral oil from the mixture of ester oil and mineral oil disclosed in JP-A-6-249551 described above, mineral oil can be removed, but iron chloride cannot be removed sufficiently. It was.
[0009]
In addition, in the above-described method for removing the residue remaining in the existing piping by cleaning, the influence of the cleaning agent on the environment, the time and cost for cleaning, the cleaning agent disposal method, and the refrigerator when the cleaning agent remains The impact on system reliability is a problem. For example, in the method described in JP-A-10-339526, a low-viscosity flushing oil is separately required, which is expensive, and it takes time to recover the flushing and low-viscosity polyvinyl ether oil. Furthermore, if the removal of the low-viscosity flushing oil is not complete, the viscosity of the lubricating oil may decrease and the lubricity of the compressor may be impaired.
[0010]
When other cleaning agents are used, chlorine-based cleaning agents are generally inexpensive and have a high cleaning effect, but they have a large negative impact on the environment, and are toxic, so care must be taken when handling them. Cleaning agents such as alcohol are flammable, and special care is required when drying the piping after cleaning and handling the cleaning agent.
[0011]
The present invention has been made to solve such a problem, and is mixed into a non-chlorine refrigerant when the refrigerant of the refrigerator system is replaced with a non-chlorine refrigerant from a chlorine refrigerant. The purpose is to easily remove iron chloride, and the purpose is to improve the reliability of the refrigerator system.
[0012]
[Means for Solving the Problems]
The refrigerant replacement method according to the present invention includes a step of discharging the chlorine-based refrigerant from a refrigerator system filled with a chlorine-based refrigerant containing a lubricant for chlorine-based refrigerant, and a non-chlorine system in the refrigerator system. The step of introducing the non-chlorine refrigerant containing the lubricant for the refrigerant and the internal refrigerant mainly including the introduced non-chlorine refrigerant from the refrigerator system are collected in the refrigerant recovery container and subjected to the phase separation process. By separating the phase of the lubricating oil for the chlorine-based refrigerant and the phase of the non-chlorine-based refrigerant remaining in the refrigerator system, the phase of the separated non-chlorine-based refrigerant is changed to iron chloride. And a step of re-introducing it into the refrigerator system after contacting with an adsorbent that can be adsorbed and removed .
[0013]
Further, the adsorbent is a zeolite carrying silver ions.
[0014]
Further, the adsorbent is activated carbon carrying silver ions.
[0015]
The iron chloride removing device according to the present invention is a refrigerant inlet that can be connected to a refrigerator system filled with a refrigerant, and a refrigerant introduced from the refrigerant inlet for a chlorine-based refrigerant remaining in the refrigerator system. A refrigerant recovery container that separates the phase of the lubricating oil and the phase of the non-chlorine refrigerant; and an adsorbent that is connected to the refrigerant recovery container and that can adsorb and remove iron chloride by contact with the phase of the non-chlorine refrigerant. And a refrigerant supply line capable of supplying the refrigerant after the contact to the refrigerator system .
[0016]
The refrigerator system according to the present invention includes a compressor, a condenser, a receiver dryer, an expansion valve, an evaporator, a circulation pipe connecting them, a refrigerant inlet connected to the circulation pipe, and a refrigerant inlet. The introduced refrigerant is connected to the refrigerant recovery container for separating the phase of the chlorine-based refrigerant lubricating oil remaining in the refrigerator system and the phase of the non-chlorine refrigerant, and the refrigerant recovery container, and the non-chlorine system An adsorption container having an adsorbent capable of adsorbing and removing iron chloride in contact with the refrigerant phase and a supply pipe for supplying the refrigerant after the contact to the circulation pipe are provided .
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a diagram for explaining the configuration of an iron chloride removing apparatus according to Embodiment 1 of the present invention. In FIG. 1, 21 is a refrigerant inlet that can be connected to a refrigerator system filled with refrigerant, 22 is a refrigerant recovery container that can hold the refrigerant introduced from the refrigerant inlet for a predetermined time, and 23 is from inside the refrigerant recovery container 22. A pipe 24 for discharging the gaseous refrigerant is a refrigerant containing lubricating oil recovered in the refrigerant recovery container 22 and shows a state separated into two phases of an upper phase 24a and a lower phase 24b. 25 is an adsorption container, 26 is an adsorbent provided in the adsorption container 25, 27 is a connection pipe connecting the refrigerant recovery container 22 and the adsorption container 25, 28 is a three-way valve provided in the middle of the connection pipe 27, A pipe 29 is connected to the three-way valve 28 and can discharge the refrigerant introduced into the refrigerant recovery container 22 through the three-way valve 28. A refrigerant 30 is introduced into the adsorption container 25 and comes into contact with the adsorbent 26. Is an outlet that can be removed and re-introduced into the refrigerator system.
[0018]
The iron chloride removing apparatus according to the present invention includes a refrigerant inlet that can be connected to a refrigerator system filled with a refrigerant, a refrigerant recovery container capable of holding the introduced refrigerant for a predetermined time, and the refrigerant recovery container to the refrigerator system A refrigerant supply line capable of supplying a refrigerant is provided, and an adsorbent capable of adsorbing and removing iron chloride is interposed in the refrigerant supply line.
[0019]
The iron chloride removing device according to the present invention is a refrigerator composed of a compressor 1, a condenser 2, a receiver dryer 3, an expansion valve 4, an evaporator 5, a circulation pipe 6, and the like, as shown in FIG. It can be used to replace the refrigerant in the system. A refrigerant replacement method for a refrigerator system using this iron chloride removing device will be described.
First, the chlorine-based refrigerant containing the chlorine-based refrigerant lubricating oil is discharged and collected from a part of the circulation pipe of the refrigerator system in which the chlorine-based refrigerant containing the chlorine-based refrigerant lubricating oil is circulated. Normally, the inside of the circulation pipe is evacuated. As the chlorine-based refrigerant, CFC-based refrigerant or HCFC-based refrigerant is used, and as the chlorine-based refrigerant lubricating oil compatible with the chlorine-based refrigerant, paraffin-based mineral oil, naphthenic mineral oil, polyalphaolein oil, alkylbenzene oil, naphthene oil, and the like are used. A mixed oil of oil and alkylbenzene is used.
[0020]
Next, a non-chlorine refrigerant containing lubricating oil for non-chlorine refrigerant is introduced into the circulation pipe of the refrigerator system. As the non-chlorine refrigerant, an HFC refrigerant is used, and as the non-chlorine refrigerant lubricating oil compatible with the non-chlorine refrigerant, ester oil, polyalkylene glycol oil, polyvinyl ether oil, or the like is used.
[0021]
After the refrigerant inlet 21 is connected to a part of the circulation pipe of the refrigerator system in which the refrigerant and the lubricating oil are circulated, the internal refrigerant mainly composed of non-chlorine refrigerant in the circulation pipe of the refrigerator system introduces the refrigerant. The refrigerant is introduced into the refrigerant recovery container 22 through the port 21. Of the refrigerant introduced into the refrigerant recovery container 22, the gaseous refrigerant is reintroduced into the circulation pipe of the refrigerator system through the pipe 23. The liquid refrigerant introduced into the refrigerant recovery container 22 is separated into an upper phase 24 a and a lower phase 24 b within the refrigerant recovery container 22. The upper phase 24a is a phase of the chlorine-based refrigerant lubricating oil, and the chlorine-based refrigerant lubricating oil is the main component. The lower phase 24b is a phase of a non-chlorine refrigerant, and the non-chlorine refrigerant is the main component.
[0022]
After the two-phase separation, the three-way valve 28 is opened, the phase of the non-chlorine refrigerant is introduced into the adsorption vessel 25 through the connection pipe 27, and the adsorbent 26 provided in the adsorption vessel 25 with the phase of the non-chlorine refrigerant. Contact with.
As a method for introducing only the phase of the non-chlorine refrigerant into the adsorption vessel 25, a transparent window is provided in the refrigerant recovery vessel 22, and a person manually operates the three-way valve 28 while looking at the transparent window. Alternatively, a method may be used in which a liquid level gauge is provided in the refrigerant recovery container 22 and the three-way valve 28 is automatically operated using the liquid level gauge.
[0023]
The adsorbent 26 may be any adsorbent that can adsorb and remove iron chloride. For example, an adsorbent carrying silver ions is used. As such an adsorbent, for example, zeolite carrying silver ions is used. Further, by using an adsorbent 26 capable of adsorbing and removing chlorine refrigerant lubricating oil in addition to iron chloride, the chlorine refrigerant lubricating oil mixed in the non-chlorine refrigerant phase simultaneously with iron chloride is also adsorbed and removed. be able to. As such an adsorbent, for example, activated carbon carrying silver ions is used.
[0024]
The iron chloride contained in the phase of the non-chlorine refrigerant reacts with silver ions supported on zeolite, activated carbon, etc., chemically changes to silver chloride and iron nitrate insoluble in the lubricating oil, and is adsorbed and removed by the adsorbent 26. Then, the phase of the non-chlorine refrigerant having a reduced iron chloride concentration is taken out from the outlet 30 and reintroduced into the refrigerator system.
[0025]
On the other hand, the phase of the chlorine-based refrigerant lubricating oil remaining in the refrigerant recovery container 22 is discharged out of the system through the discharge pipe 29 by the three-way valve 28 and recovered.
[0026]
In addition, as the adsorbent 26, when using a zeolite carrying silver ions, the non-chlorine refrigerant in which the concentration of iron chloride is reduced by treatment with the zeolite carrying silver ions is further treated with activated carbon. Chlorine refrigerant lubricating oil mixed in the non-chlorine refrigerant can also be adsorbed and removed.
[0027]
Note that the position where the refrigerant is recovered from the circulation pipe of the refrigerator system through the refrigerant inlet 21 and the position where the refrigerant is reintroduced into the circulation pipe of the refrigerator system from the outlet 30 may be anywhere in the circulation pipe. By recovering the refrigerant from the inlet side of the machine, it is desirable because the lubricating oil for chlorinated refrigerant can be separated and recovered efficiently.
[0028]
By replacing the refrigerant in the refrigerator system in this way, the lubricating oil for chlorinated refrigerant is separated and recovered, and iron chloride mixed in the non-chlorinated refrigerant is easily and quickly removed. can do.
For this reason, it is possible to prevent deterioration of lubricating oil for non-chlorine refrigerant mixed with non-chlorine refrigerant due to iron chloride acting as a Lewis acid, and deterioration of lubricating performance due to this. Thereby, the reliability of the refrigerator system can be dramatically improved.
Moreover, compared with the above-mentioned conventional method of removing the residue remaining in the refrigerator system by washing, it can be replaced at low cost and safely.
When activated carbon is used as the adsorbent, even if chlorine-based refrigerant lubricating oil is mixed in the non-chlorine-based refrigerant, the chlorine-based refrigerant lubricating oil can be easily and quickly removed. it can. For this reason, depletion of lubricating oil due to separation of non-chlorine refrigerant lubricating oil from non-chlorine refrigerant in the refrigerator system can be prevented, and deterioration in lubricating performance can also be prevented.
[0029]
Embodiment 2. FIG.
In the first embodiment, a refrigerant recovery container and an adsorption container are provided, and after the phase separation process is performed in the refrigerant recovery container, the refrigerant and the adsorbent are brought into contact with each other in the adsorption container. One container is used for processing.
In the case where the chlorine-based refrigerant lubricating oil concentration in the refrigerant taken out from the refrigerator system is low, or when the adsorbent used is capable of adsorbing and removing the chlorine-based refrigerant lubricating oil, the second embodiment An iron chloride removal device can be used. For example, when the mineral oil mixed in the ester oil is 5% or less, the two-phase separation is not performed, so this apparatus is used.
[0030]
FIG. 2 is a diagram for explaining the configuration of an iron chloride removing apparatus according to Embodiment 2 of the present invention. In FIG. 2, 31 is a refrigerant inlet that can be connected to a refrigerator system filled with refrigerant, 32 is an adsorption container for containing refrigerant introduced from the refrigerant inlet 31, and 33 is an adsorbent provided in the adsorption container 32. , 34 are pipes for discharging the gaseous refrigerant from the inside of the adsorption container 32, and 35 is an outlet through which the refrigerant introduced into the adsorption container 32 can be taken out and brought into contact with the adsorbent 33 and reintroduced into the refrigerator system.
[0031]
Next, a refrigerant replacement method for a refrigerator system using the iron chloride removing apparatus according to Embodiment 2 will be described.
The refrigerant inlet 31 is connected to a part of the circulation pipe of the refrigerator system in which the refrigerant and the lubricating oil are circulated, and then the internal refrigerant mainly composed of non-chlorine refrigerant in the circulation pipe of the refrigerator system introduces the refrigerant. It is introduced into the adsorption container 32 through the mouth 31. Of the refrigerant introduced into the adsorption container 32, the gaseous refrigerant is reintroduced into the circulation pipe of the refrigerator system through the pipe 34.
The refrigerant introduced into the adsorption container 32 is brought into contact with the adsorbent 33 provided in the adsorption container 32. The iron chloride contained in the refrigerant is adsorbed and removed by the adsorbent 33, and the refrigerant having a reduced iron chloride concentration is taken out from the outlet 35 and reintroduced into the refrigerator system. As the adsorbent 33, the same material as in the first embodiment is used.
[0032]
In the second embodiment as well, the same effect as in the first embodiment can be obtained, and the apparatus can be simplified as compared with the first embodiment.
[0033]
Example 1.
In Example 1, the result of removing iron chloride using the iron chloride removing apparatus described in the first embodiment will be described.
Table 1 summarizes the results of examining the mineral oil concentration and iron chloride concentration in the ester oil when the mineral oil concentrations of 40%, 20%, and 10% were subjected to the treatment of Embodiment 1 above. is there. Mineral oil is SUNISO3GSD (trade name) manufactured by Nippon Sun Oil Co., Ltd., and ester oil is hindered ester. As the adsorbent, activated carbon carrying silver nitrate was used.
When the initial concentration of mineral oil is 40% (Condition 1), after two-phase separation, the ester oil contained in the lower phase HFC refrigerant phase contained 25 to 27% mineral oil. . By treating the HFC refrigerant phase with activated carbon, the mineral oil concentration in the ester oil was 1% or less and the iron chloride concentration was 10 ppm or less. Similarly, in the case of an ester oil having an initial mineral oil concentration of 20% (condition 2) and in the case of an ester oil having an initial mineral oil concentration of 10% (condition 3), 11-12%, 4-7% mineral oil was included. By treating the HFC refrigerant phase with activated carbon, the mineral oil concentration in the ester oil was 1% or less and the iron chloride concentration was 10 ppm or less.
Thus, it was confirmed that the mineral oil and iron chloride in the ester oil could be removed by using the iron chloride removing apparatus of Embodiment 1 and using activated carbon supporting silver nitrate as the adsorbent.
[0034]
[Table 1]

[0035]
Example 2
In Example 2, the results of removing iron chloride using the iron chloride removing apparatus described in Embodiment 1 will be described.
Table 2 summarizes the results of examining the mineral oil concentration and iron chloride concentration in the ester oil when the mineral oil concentrations of 40%, 20%, and 10% were subjected to the treatment of Embodiment 1 above. is there. Mineral oil is SUNISO3GSD (trade name) manufactured by Nippon Sun Oil Co., Ltd., and ester oil is hindered ester. As the adsorbent, zeolite carrying silver nitrate was used.
When the initial concentration of mineral oil is 40% (Condition 1), after two-phase separation, the ester oil contained in the lower phase HFC refrigerant phase contained 25 to 27% mineral oil. . By subjecting this HFC refrigerant phase to zeolite treatment, the mineral oil concentration in the ester oil was 25 to 27%, and the iron chloride concentration was 10 ppm or less. Similarly, in the case of an ester oil having an initial mineral oil concentration of 20% (condition 2) and in the case of an ester oil having an initial mineral oil concentration of 10% (condition 3), 11-12%, 4-7% mineral oil was included. By treating the HFC refrigerant phase with activated carbon, the mineral oil concentrations in the ester oil were 11-12% and 4-7%, respectively, and the iron chloride concentration was 10 ppm or less.
Thus, it was confirmed that the iron chloride in the ester oil could be removed by using the iron chloride removing apparatus of Embodiment 1 and using zeolite supporting silver nitrate as the adsorbent.
[0036]
[Table 2]

[0037]
Example 3
In Example 3, the results of removing iron chloride using the iron chloride removing apparatus described in the second embodiment will be described.
Table 3 summarizes the results of examining the iron chloride concentration in the ester oil when the HCF refrigerant containing the ester oil with an iron chloride concentration of 1000 ppm and not containing the mineral oil was subjected to the treatment of the second embodiment. It is. Ester oil is a hindered ester.
When activated carbon carrying silver nitrate was used as the adsorbent carrying silver ions (condition 1), the iron chloride concentration in the ester oil after treatment was 10 ppm or less. When zeolite adsorbing silver nitrate was used as the adsorbent (condition 2), the iron chloride concentration in the ester oil after the treatment was 220 ppm.
As described above, it was confirmed that the iron chloride in the ester oil could be removed even using the iron chloride removing device of the second embodiment.
[0038]
[Table 3]

[0039]
【The invention's effect】
In the refrigerant replacement method for a refrigerator system according to the present invention, a chlorine-based refrigerant including a chlorine-based refrigerant lubricating oil filled in the refrigerator system is replaced with a non-chlorine-based refrigerant including a non-chlorine refrigerant lubricating oil. In addition, iron chloride remaining in the refrigerator system can be removed.
[0040]
Further, since the adsorbent is zeolite carrying silver ions, iron chloride remaining in the refrigerator system can be efficiently removed.
[0041]
Moreover, since the adsorbent is activated carbon carrying silver ions, iron chloride remaining in the refrigerator system can be efficiently removed, and the chlorine-based refrigerant lubricating oil can also be efficiently removed.
[0042]
The iron chloride removing device according to the present invention can remove iron chloride in the refrigerant.
[0043]
The refrigerator system according to the present invention can remove iron chloride in the refrigerant filled in the refrigerator system. For this reason, the problem that lubricating oil deteriorates with iron chloride in a refrigerator system can be prevented, and the reliability of a refrigerator system can be improved dramatically.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of an iron chloride removing device according to Embodiment 1 of the present invention.
FIG. 2 is a diagram for explaining the configuration of an iron chloride removal apparatus according to Embodiment 2 of the present invention.
FIG. 3 is a diagram for explaining a refrigerant replacement method of a conventional refrigerator system.
[Explanation of symbols]
21 Refrigerant inlet, 22 Refrigerant recovery container, 26, 33 Adsorbent.

Claims (7)

  A step of discharging the chlorine-based refrigerant from the refrigerator system filled with the chlorine-based refrigerant containing the chlorine-based refrigerant lubricating oil, and the non-chlorine containing the non-chlorine-based refrigerant lubricating oil in the refrigerator system The internal refrigerant mainly composed of the introduced non-chlorine refrigerant from the refrigerator system is collected in a refrigerant recovery container and subjected to a phase separation process from the refrigerator system. The step of separating the remaining phase of the lubricating oil for chlorine refrigerant and the phase of the non-chlorine refrigerant, and the separated phase of the non-chlorine refrigerant are brought into contact with an adsorbent capable of adsorbing and removing iron chloride. And then re-introducing it into the refrigerator system.   The refrigerant replacement method for a refrigerator system according to claim 1, wherein the adsorbent is zeolite carrying silver ions.   The refrigerant replacement method for a refrigerator system according to claim 1, wherein the adsorbent is activated carbon carrying silver ions. A refrigerant inlet that can be connected to a refrigerator system filled with refrigerant, a refrigerant introduced from the refrigerant inlet, and a phase of a lubricating oil for chlorine refrigerant remaining in the refrigerator system and a non-chlorine refrigerant A refrigerant recovery container for separating phases; an adsorption container connected to the refrigerant recovery container; and an adsorbent capable of adsorbing and removing iron chloride in contact with the phase of the non-chlorine refrigerant; and the refrigerant after the contact And a refrigerant supply pipe that can supply the refrigerant to the refrigerator system. The iron chloride removing device according to claim 4, wherein the adsorbent is a zeolite carrying silver ions. The iron chloride removing device according to claim 4, wherein the adsorbent is activated carbon carrying silver ions. Compressor, condenser, receiver dryer, expansion valve, evaporator, circulation pipe connecting them, refrigerant inlet connected to the circulation pipe, and refrigerant introduced from the refrigerant inlet into the refrigerator A refrigerant recovery container that separates the phase of the chlorine-based refrigerant lubricating oil remaining in the system and the phase of the non-chlorine refrigerant, and is connected to the refrigerant recovery container and contacts with the phase of the non-chlorine refrigerant to cause iron chloride. A refrigerating machine system comprising an adsorption container having an adsorbent capable of adsorbing and removing and a supply pipe for supplying the refrigerant after the contact to the circulation pipe.

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