System and method for suppressing generation of and removing impurities in helium refrigerator

Abstract

A system for suppressing the generation of and removing impurities in a helium refrigerator according to the present invention comprises: a helium gas supply line for supplying helium to a helium compressor; a compressed oil circulation line for circulating and supplying compressed oil required to compress helium in the helium compressor; a helium circulation line that circulates the helium, supplied via the helium gas supply line, to compress the helium in the helium compressor together with the compressed oil supplied via the compressed oil circulation line, and then collect and use same; and a cooling water circulation line of a compressed oil storage device, wherein the cooling water circulation line is for preventing the compressed oil from becoming high in temperature due to heat generated when the helium and the compressed oil are compressed together in the helium compressor. The system includes a first controller signally connected to a first temperature detection sensor for measuring the temperature of the rear end of the helium compressor from the rear end of the helium circulation line, and controls the opening amount of a first control valve, installed at the front end of the compressed oil storage device of the compressed oil circulation line, to control the flow rate of compressed oil supplied to the helium compressor, and thereby control the temperature at the rear end of the helium compressor.

Description

Helium refrigerator impurity generation suppression and removal system and method

[0001] The present invention relates to a system and method for suppressing and removing impurities generated in a helium refrigerator, and more particularly, to a system and method for suppressing and removing impurities generated in a helium refrigerator used in an ultra-low temperature distillation process of a tritium (T2) enrichment step of a tritium removal facility, which does not require stopping operation for performing helium purification operation.

[0002] Tritium (T), an synonymous element of hydrogen, is a radioactive nuclide with a half-life of approximately 12.3 years. It is artificially generated mostly during the operation of nuclear power plants. In particular, in some pressurized heavy water reactors (PWRs) where the generation rate is high, tritium is extracted from heavy water used as a moderator and coolant for the purpose of reducing radiation exposure by a Tritium Removal Facility (TRF). Figure 1 illustrates the process of the facility.

[0003] In the coolant and moderator of a pressurized heavy water reactor, tritium exists in the form of tritiated water (DTO), which is a form in which one deuterium atom (D) of heavy water (D2O) is substituted, and its concentration is at the level of 10 Ci / kg in the moderator system.

[0004] As illustrated in Fig. 1, in the tritium removal facility (10), tritium existing in the form of tritium water is introduced from the power plant system to the catalyst exchange process (1) through the liquid side input pipe (4) of the catalyst exchange process (1), and is then replaced with DT gas by the catalyst exchange reaction below and removed from the introduced heavy water.

[0005] Heavy water (D2O) from which tritium has been removed is returned to the power plant system through the liquid side discharge pipe (5) of the catalyst exchange process (1).

[0006] DTO (liquid) + D2 (gas) ↔ D2O (liquid) + DT (gas)

[0007] Tritium replaced with DT (gas) is transferred to the ultra-low temperature distillation process (2) through the gas-side exhaust pipe (6) of the catalytic exchange process (1), and is finally separated and extracted into deuterium gas (D2) and tritium (T2) due to the difference in boiling points.

[0008] In addition, the deuterium gas discharged as a gas in the ultra-low temperature distillation process (2) is supplied as an input gas to the catalyst exchange process (1) through the gas upper side input pipe (7) of the catalyst exchange process (1).

[0009] Tritium (T2) is supplied through a concentration supply pipe (8) to the ultra-low temperature distillation process (3), and a helium refrigerator is used in the ultra-low temperature distillation process (3).

[0010] The helium compressor, which is the main device of the helium refrigerator, has a problem in that the temperature at the rear of the helium compressor changes significantly depending on the change in the cooling water temperature because the temperature is controlled only by the temperature of the compressed oil storage tank after the initial setting.

[0011] The heat generated in the helium compressor carbonizes the compressed oil, creating impurities such as hydrocarbons. Some of the impurities pass through the Oil Removal System (ORS) and are condensed in the heat exchanger.

[0012] There is a problem that when a certain efficiency is reached, the helium refrigerator operation must be stopped and helium purification operation must be performed to suppress and remove the impurities, because the condensed impurities hinder heat exchange and lower the efficiency of the heat exchanger.

[0013] There is a problem that restarting a helium refrigerator after stopping it takes 8 days according to the standard process.

[0014] However, in the existing technology, since the adsorber is installed at the rear end of the heat exchanger, impurities adsorbed in the heat exchanger cannot be removed, and thus the efficiency of the heat exchanger cannot be reduced, which limits the operating period of the helium compressor.

[0015] In addition, compressed oil (lubricating oil) has the property of decomposing into carbon dioxide and other oxygen when the temperature rises or when it comes into contact with oxygen, so contact with oxygen must be blocked, but there is no measure to prevent oxygen from flowing into the compressed oil storage tank.

[0016] The system and method for suppressing and removing impurities in a helium refrigerator have been described using a catalytic process as an example, but can be applied to other ultra-low temperature systems such as hydrogen liquefiers.

[0017] The present invention has been devised to solve such problems, and the purpose of the present invention is to provide a helium refrigerator impurity generation suppression and removal system and method, which can maintain the performance of a heat exchanger by suppressing the generation of impurities other than hydrogen adsorbed in the heat exchanger and removing the generated impurities, and can reduce the contact of oxygen introduced during compression oil replenishment or exchange with the compression oil.

[0018] The system for suppressing and removing impurities in a helium refrigerator of the present invention comprises a helium gas supply line for supplying helium to a helium compressor, a compression oil circulation line for circulating and supplying compression oil required for compressing helium in the helium compressor, a helium circulation line for circulating the helium supplied through the helium gas supply line together with the compression oil supplied through the compression oil circulation line for compressing and recovering the helium in the helium compressor and using it, and a cooling water circulation line of a compression oil storage device for preventing the compression oil from becoming high in temperature due to heat generated when helium and compression oil are compressed together in the helium compressor, and a first controller for controlling the opening and closing amount of a first control valve installed in front of the compression oil storage device of the compression oil circulation line by controlling the flow rate of compression oil supplied to the helium compressor at the rear end of the helium compressor, signal-connected to a first temperature detection sensor for measuring the temperature at the rear end of the helium compressor in the helium circulation line, thereby controlling the temperature at the rear end of the helium compressor. It is characterized by.

[0019] According to a system and method for suppressing and removing impurities generated in a helium refrigerator for removing tritium according to one embodiment of the present invention, when the temperature at the rear end of the helium compressor increases, the first control valve, which is a compression oil flow control valve, is controlled by the first controller to increase the compression oil flow rate, thereby suppressing the rise in the temperature at the rear end of the helium compressor.

[0020] In addition, when the temperature of the helium compressor is maintained at a high temperature, the second controller sends a signal to the second control valve, which is a cooling water flow control valve, to increase the cooling water flow rate according to the rate of increase of the temperature at the rear end of the helium compressor and the temperature inside the compressed oil storage device, thereby controlling the temperature of the compressed oil storage tank of the compressed oil storage device.

[0021] In addition, the first adsorber and the second adsorber are connected in series to remove gases such as hydrocarbons, nitrogen, oxygen, and hydrogen that are generated or introduced from the outside and cannot be controlled by temperature.

[0022] The first adsorber removes gases such as hydrogen that are adsorbed at ultra-low temperatures, and the second adsorber can remove gases with relatively high adsorption temperatures such as hydrocarbons and nitrogen.

[0023] Impurities can be monitored by the efficiency of the first heat exchanger, and since gas analysis is not required, the efficiency can be monitored quickly and the adsorption flow rate of the first adsorber can be formed to maintain the heat exchange efficiency.

[0024] Additionally, the compressed oil storage device may further include a nitrogen injection device that injects nitrogen into the compressed oil storage tank to prevent oxidation of the compressed oil in order to reduce contact between oxygen introduced into the compressed oil storage tank when replenishing or replacing the compressed oil and the compressed oil.

[0025] Figure 1 is a process concept diagram for a conventional tritium removal facility.

[0026] Figure 2 is a flow diagram of a helium refrigerator impurity generation suppression and removal system for tritium removal equipment according to one embodiment of the present invention.

[0027] Figure 3 is a configuration diagram of a helium refrigerator impurity generation suppression and removal system for tritium removal equipment according to one embodiment of the present invention, and

[0028] Figure 4 is a flowchart showing a method for suppressing and removing impurities generated in a helium refrigerator of a tritium removal facility according to one embodiment of the present invention.

[0029] The advantages and / or features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

[0030] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0031] FIG. 2 is a flow diagram of a tritium removal facility helium refrigerator impurity generation suppression and removal system according to an embodiment of the present invention, FIG. 3 is a diagram of a tritium removal facility helium refrigerator impurity generation suppression and removal system according to an embodiment of the present invention, and FIG. 4 is a flow diagram showing a tritium removal facility helium refrigerator impurity generation suppression and removal method according to an embodiment of the present invention.

[0032] As shown in FIGS. 2 and 3, a helium refrigerator impurity generation suppression and removal system (100) according to an embodiment of the present invention for removing tritium largely includes a helium compressor (110), a compressed oil storage device (120), a nitrogen supply device (125), a cooling device (130), an oil removal device (140), a heat exchanger (150), an expansion device (155), an adsorption device (160), a helium storage device (170), a flow control valve device (180), a temperature detection device (190), and a control device (200).

[0033] As illustrated in FIG. 2, a helium refrigerator impurity generation suppression and removal system (100) according to an embodiment of the present invention largely includes a helium gas supply line (I), a helium circulation line (2) for compressing and circulating helium supplied through the helium gas supply line (I) together with compression oil supplied through a compression oil circulation line (III) to be described later in a helium compressor (110), a compression oil circulation line (III) for circulating compression oil required for helium compression in the helium compressor (110), and a cooling water circulation line (IV) for preventing the compression oil from becoming high in temperature due to heat generated when helium and compression oil are compressed together in the helium compressor (110).

[0034] The above helium gas supply line (I) is configured to supply helium in one direction from a helium storage device (170) that can be a high-pressure helium bomb storing ultra-low temperature helium gas to the helium compressor (110), and to sequentially pass through a low-temperature first adsorber (161) and a high-temperature second adsorber (163).

[0035] The first adsorber (161) can adsorb gases such as hydrogen having a low liquefaction point when helium gas is supplied from the outside, such as the helium storage device (170), and the second adsorber (163) can adsorb other gases such as nitrogen and hydrocarbons having a somewhat high liquefaction point, so that clean helium gas can be supplied before helium compression occurs in the helium compressor (110).

[0036] The helium compressor (110) supplied with clean helium gas through the helium gas supply line (I) can also recover and use helium gas through the helium gas circulation line (II).

[0037] The above helium gas circulation line (II) includes the helium compressor (110), an oil removal device (140) installed at the rear end of the helium compressor (110) to remove oil in order to recover and use the helium gas, a heat exchange device (150) for cooling the helium compressor (110) by exchanging heat with the high-temperature helium gas that has passed through the oil removal device (140), an adsorption device (160) for removing impurities in order to prevent the compression oil from being carbonized by the heat generated in the helium compressor (110) and generating impurities such as hydrocarbons, thereby reducing the efficiency of the heat exchange device (150), and an expansion device (165) for recovering the helium gas that has passed through the adsorption device (160) so that it can be reused in the helium compressor (110), and the helium gas coming out of the expansion device (165) is again It is configured to be circulated and supplied to the helium compressor (110) through a heat exchanger (150).

[0038] The heat exchanger (150) may include a first heat exchanger (151) and a second heat exchanger (153) arranged in series at the rear end of the oil removal device (140), and the first adsorber (161) of the adsorption device (160) is installed at the rear end of the second heat exchanger (153), and the second adsorber (163) is installed at the rear end of the first heat exchanger (151), so that impurities such as hydrocarbons generated by carbonization of compressed oil by heat generated from the helium compressor (110) are primarily removed in the second adsorber (163), and gases such as hydrogen at a lower temperature are secondarily removed in the first adsorber (161), so that the oil mist is removed by the oil removal device (140) and the clean helium gas from which the oil vapor is removed in the adsorption device (160) is sent to the expansion device (165). You can send it.

[0039] The above expansion device (165) may be an expansion turbine, and the efficiency of the heat exchanger can be maintained because impurities are removed by the adsorption device (150).

[0040] A cooler (167) is connected to the above expansion device (165) to cool and separate deuterium and tritium.

[0041] The helium gas expanded and heat-exchanged through the expansion device (165) and cooler (167) can be supplied to the helium compressor (110) sequentially through the second heat exchanger (163) and the first heat exchanger (161).

[0042] When the helium gas is compressed together with the compressed oil supplied from the compressed oil storage device (120) in the helium compressor (110), the temperature of the helium compressor (110) rises, and the high-temperature helium gas coming out of the helium compressor (110) can be cooled by going back and forth between the first heat exchanger (151) and the second heat exchanger (153), and the impurities such as hydrocarbons generated by the carbonization of the compressed oil by the heat generated in the helium compressor (110) are primarily removed through the second adsorber (163) arranged at the rear end of the first heat exchanger (151), and the gases such as hydrogen at a lower temperature than the first adsorber (161) arranged at the rear end of the first heat exchanger (153) are secondarily removed, and then the gas passes through the commercial expansion device (165) and then passes through the second heat exchanger (153) and the first Since helium gas is supplied to the helium compressor (110) through the heat exchanger (151), the efficiency of the heat exchanger (150) can be prevented from decreasing.

[0043] The above helium compressor (110) can compress helium gas using compression oil together with helium gas supplied through the helium gas supply line (I) and the helium gas circulation line (II), and the compression oil is configured to be circulated and supplied through the compression oil circulation line (III) between the compression oil storage device (120) and the helium compressor (110).

[0044] When the compressed oil is compressed together with the helium gas in the helium compressor (110), the temperature of the helium compressor (110) rises. The compressed oil storage device (120) is configured to be cooled by a cooling water circulation line (IV) connected to a cooling device (130) so that the compressed oil storage device (120) can supply compressed oil at an initially set temperature to the helium compressor (110).

[0045] As illustrated in FIG. 3, a helium refrigerator impurity generation suppression and removal system (100) according to one embodiment of the present invention includes a first control valve (181) for controlling the compressed oil flow rate of a helium compressor as a flow control valve device (180), a second control valve (183) for controlling the coolant flow rate supplied to the front end of the compressed oil storage device (120) of the compressed oil circulation line (III) to control the compressed oil temperature, and a third control valve (185) for controlling the ultra-low temperature helium flow rate coming from an expansion turbine.

[0046] In addition, the tritium removal facility helium refrigerator impurity generation suppression and removal system (100) according to one embodiment of the present invention comprises a first temperature detection sensor (191) for measuring the rear temperature (T1) of the helium compressor (110) at the rear end of the helium compressor (110) as the temperature detection device (190), a second temperature detection sensor (192) for measuring the compression oil temperature (T2) in the compression oil storage tank (121) of the compression oil storage device (120), a third temperature detection sensor (193) for measuring the helium gas temperature (T3) of the front end of the helium compressor (110) entering the helium compressor (110) from the first heat exchanger (151), and a first temperature detection sensor (194) for measuring the helium gas temperature (T3) of the front end of the first heat exchanger entering the first heat exchanger (151) via the oil removal device (140). It includes a fourth temperature detection sensor (194) for measuring the helium gas temperature (T4), a fifth temperature detection sensor (195) for measuring the temperature (T5) at the rear end of the first heat exchanger (151) where the gas heat-exchanged in the first heat exchanger (151) enters the first adsorber (161), and a sixth temperature detection sensor (196) for measuring the temperature (T6) at the front end of the first heat exchanger (151) where the gas enters the first heat exchanger (151) through the expansion device (165) and the second heat exchanger (153).

[0047] A helium refrigerator impurity generation suppression and removal system (100) according to one embodiment of the present invention may include a control device (200) that is signal-connected to a first temperature detection sensor (191) for measuring the rear end temperature (T1) of the helium compressor (110) at the rear end of the helium compressor (110) and controls the opening and closing amount of a first control valve (181) installed at the front end of the compressed oil storage device (120) of the compressed oil circulation line (III) to control the compressed oil flow rate supplied to the helium compressor (110).

[0048] In addition, the control device (200) may include a second controller (203) that is signal-connected to a first temperature detection sensor (191) for measuring the rear temperature (T1) of the helium compressor (110) at the rear end of the helium compressor (110) and a second temperature detection sensor (192) for measuring the compressed oil temperature (T2) in the compressed oil storage tank (121) of the compressed oil storage device (120) and controls the opening and closing amount of a second control valve (183) installed at the rear end of the cooling water supply system (130) of the cooling device (130) of the cooling water circulation line (IV) to control the flow rate of the coolant supplied to the compressed oil storage device (120).

[0049] In addition, the control device (200) includes a third controller (205) for monitoring the efficiency of the heat exchanger (150), the third controller (205) includes a third temperature detection sensor (193) for measuring the temperature (T3) of helium gas at the front end of the helium compressor (110) entering the helium compressor (110) from the first heat exchanger (151), a fourth temperature detection sensor (194) for measuring the temperature (T4) of helium gas at the front end of the first heat exchanger entering the first heat exchanger (151) through the oil removal device (140), and a fifth temperature detection sensor (194) for measuring the temperature (T5) of the rear end of the first heat exchanger (151) where the gas heat-exchanged in the first heat exchanger (151) enters the first adsorber (161). The temperature detection sensor (195) and the sixth temperature detection sensor (196) for measuring the temperature (T6) of the front end of the first heat exchanger (151) that enters the first heat exchanger (151) through the expansion device (165) and the second heat exchanger (153) are signal-connected to control the opening and closing amount of the third control valve (185) that can supply ultra-low temperature helium to the first adsorber (161), thereby controlling the amount of helium gas supplied from the rear end of the expansion turbine (165).

[0050] As illustrated in FIG. 4, the method for suppressing the generation of impurities in a helium refrigerator for removing tritium according to one embodiment of the present invention is such that the first controller (201) causes the first temperature detection sensor (191) installed at the rear end of the helium compressor (110) to measure the rear end temperature (T1) of the helium compressor (110) (S11) and determine whether it is above a predetermined temperature (TT) (S12).

[0051] When the first controller (201) determines that the temperature (T1) at the rear end of the helium compressor (110) is higher than a predetermined temperature (TT), it controls the opening and closing amount of the first control valve (181) installed at the rear end of the compressed oil storage device (120) of the compressed oil circulation line (III) to control the compressed oil flow rate supplied to the helium compressor (110) (S13), thereby immediately suppressing the rise in the temperature of the helium gas at the rear end of the helium compressor (110).

[0052] That is, the first controller (201) detects the temperature (T1) at the rear end of the helium compressor (110) with the first temperature detection sensor (191) and controls the temperature at the rear end of the helium compressor (110) by controlling the compression oil flow rate with the first control valve (181).

[0053] In addition, the second controller (203) independently of the first controller (201) receives the rear temperature (T1) of the helium compressor (110) from the first temperature detection sensor (191) installed at the rear of the helium compressor (110) and determines whether it is in an upward trend of a certain slope or more (21).

[0054] Next, the second controller (203) receives the temperature (T2) inside the compressed oil storage tank (121) of the compressed oil storage device (120) from the second temperature detection sensor (192) (S22), and if the temperature (T2) inside the compressed oil storage tank is determined to have an upward trend exceeding a certain slope (S23), it controls the opening / closing amount of the second control valve (183) installed at the rear end of the cooling water supply system (130) of the cooling water circulation line (IV) to control the cooling water flow rate supplied to the compressed oil storage device (120) (S24).

[0055] That is, the second controller (203) controls the opening and closing amount of the second control valve (183) installed in front of the cooling water storage tank (131) by using the rear temperature (T1) of the helium compressor (110) and the internal temperature (T2) of the compressed oil storage tank, thereby preventing heat accumulation in the compressed oil storage tank (121) of the compressed oil storage device (120).

[0056] In addition, independently of the first controller (201) and the second controller (203), the third controller (205) receives the temperature (T3) of the recovered helium gas at the rear end of the first heat exchanger (151) that enters the helium compressor (110) from the first heat exchanger (151) from the third temperature detection sensor (193) (S31), receives the temperature (T4) of the helium gas at the front end of the forward first heat exchanger that enters the first heat exchanger (151) through the oil removal device (140) from the fourth temperature detection sensor (194) (S32), and receives the temperature (T4) of the helium gas at the rear end of the forward first heat exchanger (151) that enters the first adsorber (161) through the fifth temperature detection sensor (195). The helium gas temperature (T5) is received (S33), the recovery helium gas temperature (T6) at the front end of the first heat exchanger (151) that enters the first heat exchanger (151) through the expansion device (165) and the second heat exchanger (153) from the sixth temperature detection sensor (197) is received (S34), the temperature increase rate is monitored to determine whether it is below a predetermined efficiency by an efficiency formula combining each temperature (S35), and the opening / closing amount of the third control valve (185) at the rear end of the expansion turbine (165) is controlled (S36) to control the amount of helium gas supplied to the first adsorber (161) from the rear end of the expansion turbine (165).

[0057] The third controller (205) measures the efficiency of the first heat exchanger (151) by measuring the temperature (T3) of the helium gas recovered at the rear of the first heat exchanger measured by the third temperature detection sensor (193), the temperature (T4) of the helium gas forward of the first heat exchanger measured by the fourth temperature detection sensor (194), the temperature (T5) of the helium gas forward of the first heat exchanger measured by the fifth temperature detection sensor (195), and the temperature (T6) of the helium gas forward of the first heat exchanger measured by the sixth temperature detection sensor (196), thereby monitoring the first heat exchanger (151), and controlling the amount of helium gas supplied to the first adsorber (161) from the rear of the expansion turbine (165), thereby controlling the first The performance of the first heat exchanger (151) can be maintained by removing impurities other than hydrogen adsorbed in the heat exchanger (151).

[0058] Accordingly, the third controller (205) may be a heat exchanger efficiency monitoring controller capable of measuring the efficiency of the first heat exchanger (161) with the forward and reverse front and rear temperatures (T3, T4, T5, T6) of the first heat exchanger (161), and the third control valve (185) may be an adsorber flow rate forming valve (V3).

[0059] The first adsorber (161) and the second adsorber (163) are connected in series, so that gases such as hydrogen having a low liquefaction point can be adsorbed in the first adsorber (161), and gases such as nitrogen and hydrocarbons having a somewhat high liquefaction point can be adsorbed in the second adsorber (163), thereby protecting the expansion turbine (165) and maintaining the efficiency of the first and second heat exchangers (151, 153).

[0060] When helium gas and compressed oil are compressed together in the helium compressor (110), the gas temperature rises, and when the temperature at the rear end of the helium compressor (110) increases, the first control valve (181), which is a compressed oil flow rate control valve (V1), is controlled by the first controller (201) to increase the compressed oil flow rate, thereby suppressing the rise in the temperature at the rear end of the helium compressor (110).

[0061] When the temperature of the helium compressor (110) is maintained at a high temperature, the second controller (203) sends a signal to the second control valve (183), which is a cooling water flow rate control valve (V2), according to the rate of increase of the temperature (T1) at the rear end of the helium compressor (110) and the temperature (T2) inside the compressed oil storage device (120), thereby increasing the cooling water flow rate and controlling the temperature of the compressed oil storage tank (121) of the compressed oil storage device (120).

[0062] The first adsorber (161) and the second adsorber (163) are connected in series to remove gases such as hydrocarbons, nitrogen, oxygen, and hydrogen that are generated or introduced from the outside and cannot be controlled by temperature.

[0063] The first adsorber (161) above removes gases such as hydrogen that are adsorbed at ultra-low temperatures, and the second adsorber (163) above can remove gases with relatively high adsorption temperatures such as hydrocarbons and nitrogen.

[0064] Impurities can be monitored by the efficiency of the first heat exchanger (151), and since gas analysis is not required, the efficiency can be quickly monitored and the heat exchange efficiency can be maintained by forming the adsorption flow rate of the first adsorber (161).

[0065] Additionally, the compressed oil storage device (120) may further include a nitrogen supply device (125) that injects nitrogen into the compressed oil storage tank (121) to prevent oxidation of the compressed oil in order to reduce contact between oxygen flowing into the compressed oil storage tank (121) when replenishing or exchanging the compressed oil and the compressed oil.

Claims

1. Helium gas supply line that supplies helium to the helium compressor; A compression oil circulation line that circulates and supplies the compression oil required for helium compression in the above helium compressor; A helium circulation line that circulates the helium supplied through the helium gas supply line together with the compression oil supplied through the compression oil circulation line to be compressed in the helium compressor and then recovered for use; and It includes a cooling water circulation line of a compressed oil storage device to prevent the compressed oil from becoming high in temperature due to the heat generated when helium and compressed oil are compressed together in the above helium compressor. A helium refrigerator impurity generation suppression and removal system including a first controller that controls the opening and closing amount of a first control valve installed in front of a compressed oil storage device of the compressed oil circulation line by controlling the flow rate of compressed oil supplied to the helium compressor, thereby controlling the temperature at the rear end of the helium compressor, and signal-connected to a first temperature detection sensor for measuring the temperature at the rear end of the helium compressor in the helium circulation line.

2. In paragraph 1, A helium refrigerator impurity generation suppression and removal system including a second controller that is independently connected to the first temperature detection sensor and the second temperature detection sensor for measuring the temperature of the compressed oil of the compressed oil storage device and controls the opening and closing amount of a second control valve installed at the front end of the cooling water storage tank of the cooling water circulation line to control the flow rate of the cooling water supplied to the compressed oil storage device.

3. In paragraph 1, The helium circulation line includes the helium compressor, an oil removal device installed at the rear end of the helium compressor, a heat exchanger for cooling the helium compressor by exchanging heat with high-temperature helium gas passing through the oil removal device, an adsorption device for removing impurities to prevent impurities from adhering to the heat exchanger, and an expansion device for expanding and drying the helium gas passing through the adsorption device, and the helium gas coming out of the expansion device is configured to be circulated and supplied to the helium compressor again through the heat exchanger. A helium refrigerator impurity generation suppression and removal system, wherein the heat exchanger comprises a high-temperature first heat exchanger and a low-temperature second heat exchanger arranged in series at the rear end of the oil removal device, and the adsorption device comprises a second adsorber installed in the forward direction at the rear end of the first heat exchanger to primarily remove impurities such as hydrocarbons generated in the helium compressor, and a first adsorber installed at the rear end of the second heat exchanger to secondarily remove lower-temperature gases such as hydrogen.

4. In paragraph 3, A helium refrigerator impurity generation suppression and removal system, comprising a third controller for monitoring the efficiency of the first heat exchanger by measuring the temperature of the helium gas recovered at the rear end of the first heat exchanger measured by the third temperature detection sensor, the temperature of the helium gas forward of the first heat exchanger measured by the fourth temperature detection sensor, the temperature of the helium gas forward of the first heat exchanger measured by the fifth temperature detection sensor, and the temperature of the helium gas recovered at the front end of the first heat exchanger measured by the sixth temperature detection sensor, and controlling the amount of helium gas supplied to the first adsorber by opening and closing the first control valve at the front end of the helium supply device of the helium supply line to remove impurities other than hydrogen adsorbed in the first heat exchanger.

5. In paragraph 4, A helium refrigerator impurity generation suppression and removal system further comprising a nitrogen supply device coupled to the above compressed oil storage device.

6. In the helium refrigerator impurity suppression and removal method of the helium refrigerator impurity suppression and removal system according to Article 5, The first controller detects the temperature at the rear end of the helium compressor using the first temperature detection sensor, The temperature at the rear end of the helium compressor is controlled by adjusting the compression oil flow rate, A helium refrigerator impurity suppression and removal method, in which a second controller independently of the first controller controls the opening and closing amount of a second control valve installed in front of a cooling water storage tank connected to the compressed oil storage device using the rear end temperature of the helium compressor and the internal temperature of the compressed oil storage device to prevent heat accumulation in the compressed oil storage device.

7. In paragraph 6, Independently of the first controller and the second controller, the third controller receives the temperature of the recovered helium gas at the rear end of the first heat exchanger entering the helium compressor from the first heat exchanger from the third temperature detection sensor, Receive the temperature of the helium gas in front of the first heat exchanger that enters the first heat exchanger through the oil removal device from the fourth temperature detection sensor, The fifth temperature detection sensor receives the temperature of the helium gas passing through the first heat exchanger and entering the first adsorber, Receive the temperature of the recovered helium gas in front of the first heat exchanger, which enters the first heat exchanger through the expansion device and the second heat exchanger, from the sixth temperature detection sensor, and A helium refrigerator impurity suppression and removal method that controls the amount of helium gas supplied to the first adsorber by controlling the opening and closing amount of the third control valve at the rear end of the expansion turbine when the efficiency is below a predetermined level according to an efficiency formula combining each temperature.

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