JP2005113722A - High pressure gas compression system, oil collection device and oil collection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately and safely collect minute oil component in high pressure gas in a high pressure gas compression system. <P>SOLUTION: The high pressure compression system 100 is provided with a oil lubrication type compressor 30 sucking high pressure process gas from a suction line 31 and compressing the same, a gas filter 36 filtering oil component in process gas discharged from a compressor 30 and delivering the process gas to a delivering line, and an oil collection system 20 making the process gas in the delivery line 38 filtered by the gas filter 36 flow therein and collecting oil component in the process gas. The oil collection system 20 is connected to the delivery line 38 at a flow-in side and to the suction line 31 at a flow-out side, and includes a low temperature cooling collection part 2 cooling flow-in process gas to low temperature and collecting oil component in the process gas. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a high-pressure gas compression system, an oil content collection device, and an oil content collection method, and in particular, an extremely small oil content in a process gas under operating conditions in which a process gas such as a combustible gas or a toxic gas is handled at a high pressure of 5 MPa or more. The present invention relates to a high-pressure gas compression system, an oil collecting device, and an oil collecting method suitable for collecting and verifying oil.

  As a conventional apparatus for measuring oil content in compressed gas, there is one described in JP-A-10-212220 (Patent Document 1). This patent document 1 discloses the following.

  In the oil-cooled compressor of Patent Document 1, the compression unit that compresses the suction gas and discharges the compressed gas becomes very hot, and is cooled by circulating oil through the compression unit by the oil cooling unit. Since a certain amount of oil is still mixed in the compressed gas discharged from the compression section and recovered by the oil recovery section, the remaining oil is removed by passing through the oil separation section. The compressed gas from which oil has been removed by the oil separation unit is cooled by the cooling unit, and water drains from the compressed gas due to the cooling. Precipitated water drain is removed by a water drain remover and discharged to the outside through a drain trap, and the compressed gas after the water drain is removed is used for each application.

  However, even if the oil separator is used, it is impossible to completely remove the oil from the compressed gas, and the compressed gas discharged has various uses with a very small amount of oil (about several ppm) included. Used for. Therefore, it is very important to keep the amount of oil contained in the exhausted compressed gas below the specified value. For example, when the use of compressed gas is related to food, semiconductors, etc., it must be done with great care. .

  Therefore, in order to monitor the amount of oil contained in the exhaust compressed gas, it is necessary to measure the amount of oil in the compressed gas. As a method for measuring the amount of oil, for example, a method in which a part of compressed gas is taken out and measured with an infrared absorption type, a hydrocarbon meter, or the like, or a quartz vibration sensor is installed in a compressed gas pipe to adsorb oil. There are a method of measuring the frequency, a method of measuring the oil content of the water drain removed by the water drain removing means connected to the compressed gas supply pipe, and the like using an oil sensor.

JP-A-10-212220

  However, the device for measuring oil content in compressed gas disclosed in Patent Document 1 measures an amount of oil of about several ppm contained in the compressed gas, and it is disclosed to measure an oil content that is much smaller than that. Absent. For example, in the method of measuring the vibration frequency by installing the quartz vibration sensor shown in Patent Document 1 in a compressed gas pipe and adsorbing oil, the quartz vibration sensor of oil in a high temperature state of the discharged compressed gas. It is difficult to accurately measure the amount of oil with a high temperature. In particular, in the case of a compressed gas compressed by sucking a high-pressure gas of 5 MPa or more into an oil-cooled compressor, it is extremely difficult to accurately measure the minimum amount of oil in the compressed gas.

  Moreover, in the method of taking out a part of the compressed gas of Patent Document 1 and measuring it with an infrared absorption type, hydrocarbon meter or the like, there is no disclosure regarding the processing of the compressed gas after measurement. For example, when compressed gas after measurement is released into the atmosphere, gas loss may occur, and inflammable gas or toxic gas may cause ignition or air pollution. For this reason, releasing compressed gas over a long period of time in order to measure the minimum amount of oil has a problem in safety, and also from this point, it has been difficult to accurately measure the minimum amount of oil.

  An object of the present invention is to provide a high pressure gas compression system, an oil content collection device, and an oil content collection method capable of accurately and safely collecting an extremely small amount of oil in a high pressure gas.

  In order to achieve the above object, the present invention provides an oil-lubricated compressor that sucks and compresses high-pressure process gas from a suction line, and filters oil in the process gas discharged from the compressor to the discharge line. In a high-pressure gas compression system comprising a gas filter for delivery, an oil collection system is provided for collecting the oil in the process gas by flowing in the process gas of the discharge line that has passed through the gas filter, and collecting the oil The system connects the inflow side to the discharge line, connects the outflow side to the suction line, cools the inflow process gas to a low temperature, and collects oil in the process gas. It is in the structure which has a part.

  In the above invention, preferably, the oil collecting system is connected to the discharge line via a pressure reducing device.

  Moreover, in the said invention, Preferably, the mixing heating part which branches and mixes a part of process gas which flows in from the said discharge gas line is provided in the outflow side of the said low-temperature cooling collection part.

  Further, in the above-mentioned invention, preferably, a pre-cooling heating unit is provided to exchange heat between the process gas in the inflow side passage to the low temperature cooling collection unit and the process gas in the outflow side passage from the low temperature cooling collection unit. Is.

  In order to achieve the above object, the present invention provides an oil-lubricated compressor that sucks and compresses high-pressure process gas from a suction line, and filters oil in the process gas discharged from the compressor to the discharge line. In an oil collecting apparatus that is used in a high pressure gas compression system including a gas filter to be sent out and collects oil in the process gas by flowing in process gas in the discharge line that has passed through the gas filter, An inflow portion connected to the discharge line, an outflow side connected to the suction line, a low-temperature cooling collection portion that cools the inflowing process gas to a low temperature and collects oil in the process gas. It is in the structure provided with.

  In the invention, preferably, the low-temperature cooling collection part, the process gas in the inflow side passage to the low-temperature cooling collection part and the process gas in the outflow side passage from the low-temperature cooling collection part are provided to exchange heat. The heating unit after pre-cooling and the mixing and heating unit provided so as to branch and mix part of the process gas flowing from the discharge gas line on the outflow side of the low-temperature cooling collection unit are integrated in this order. Is formed.

  In order to achieve the above object, the present invention provides an oil-lubricated compressor that sucks and compresses high-pressure process gas from a suction line, and filters oil in the process gas discharged from the compressor to the discharge line. In the oil collection method for collecting oil in the process gas by flowing in the process gas of the discharge line that has been used in a high pressure gas compression system including a gas filter to be sent and passed through the gas filter, the discharge line The process gas is caused to flow into the low-temperature cooling collection part, and the process gas flowing in the low-temperature cooling collection part is cooled to a low temperature to collect oil in the process gas, and then the process gas is supplied to the suction line. It is because it was made to leak.

  According to the present invention, the inflow side of the oil collection system is connected to the discharge line, the outflow side is connected to the suction line, and the inflow process gas is cooled to a low temperature to collect the oil in the process gas. Therefore, it is possible to provide a high-pressure gas compression system that can accurately and safely collect a very small amount of oil in the high-pressure gas.

  According to a preferred example of the present invention, since the oil collecting system is connected to the discharge line via the pressure reducing device, the oil collecting system is made closer to the suction line pressure than the discharge line pressure to collect the oil content. Therefore, the low-temperature cooling and collecting part can be made simple and inexpensive.

  Further, according to a preferred example of the present invention, the mixing and heating unit for branching and mixing part of the process gas flowing from the discharge gas line is provided on the outflow side of the low-temperature cooling and collecting unit, so that it is simple and inexpensive. With the structure, the temperature of the process gas after oil collection can be raised and returned to the suction line.

  Further, according to a preferred example of the present invention, the pre-cooling heating unit that exchanges heat between the process gas in the inflow side passage to the low temperature cooling collection unit and the process gas in the outflow side passage from the low temperature cooling collection unit is provided. Since it is provided, it is possible to efficiently perform pre-cooling and post-heating of the process gas to the low-temperature cooling collection part with a simple and inexpensive structure.

  According to the present invention, the inflow side of the oil collecting device is connected to the discharge line, the outflow side thereof is connected to the suction line, and the inflow process gas is cooled to a low temperature to collect the oil in the process gas. Therefore, it is possible to provide an oil collecting device that can accurately and safely collect a very small amount of oil in the high-pressure gas.

  According to a preferred example of the present invention, heat exchange is performed between the low-temperature cooling collection unit, the process gas in the inflow side passage to the low-temperature cooling collection unit, and the process gas in the outflow side passage from the low-temperature cooling collection unit. The pre-cooling heating unit provided and the mixing heating unit provided so as to branch and mix part of the process gas flowing from the discharge gas line to the outflow side of the low-temperature cooling collection unit are integrated in this order. Since it is formed, it is possible to pre-cool the inflow process gas and warm the outflow process gas to the low-temperature cooling collection section with a simple and inexpensive structure, and to increase the temperature of the process gas after oil collection, and to the suction line Can be returned to.

  According to the present invention, the process gas is allowed to flow from the discharge line to the low temperature cooling collection part, the process gas flowing in the low temperature cooling collection part is cooled to a low temperature and the oil in the process gas is collected, Since the process gas is allowed to flow out to the suction line, it is possible to provide an oil content collecting method capable of collecting a very small amount of oil in the high pressure gas with high accuracy and safety.

  An embodiment of the present invention will be described below with reference to FIGS.

  First, the overall configuration of the high-pressure gas compression system of the present embodiment will be described with reference to FIG. FIG. 1 is a diagram for explaining the configuration of the high-pressure gas compression system of this embodiment and the flow of process gas.

  The high-pressure gas compression system 100 of this embodiment is a system for a hydrogen supply station, and includes a main body system 30 having a hydrogen compressor 30A for the hydrogen supply station and an oil content collection system 20 having an oil content collection device 20A. It is configured. The oil collecting system 20 is connected to the main body system 30 so as to form a closed loop.

  The compressor 30A is provided with a first-stage compressor 32 and a two-stage compressor 33 on both sides, and a compression driver 34 for driving them at the center. The first-stage compressor 32 and the second-stage compressor 33 are plunger-type compressors (oil-lubricated compressors) that inject seal oil into the plunger seal portion. This plunger type compressor is more reliable than the oil-free type diaphragm compressor.

  In the main body system 30, when the suction valve 31a provided in the suction line 31 is opened, a process gas that is hydrogen gas having a pressure of about 5 to 20 MPa from the suction line 31 is provided on one side of the compressor 30A. After the machine 32 is sucked and compressed, it is discharged to the gas cooler 35 and cooled. The cooled process gas is then compressed by a two-stage compressor 33 provided on one side of the compressor 30A, and discharged at a discharge pressure of about 40 to 84 MPa. Since oil is used in the first-stage compressor 32 and the second-stage compressor 33, the oil is mixed into the process gas compressed by these. The compressed process gas is cooled by a gas cooler 35, then passes through a filter device 36, and oil is filtered to reach a discharge line 38. Here, when the discharge valve 38a provided in the discharge line 38 is opened, the process gas is supplied to the plant or the like through the discharge valve 38a.

  The oil collecting system 20 is used in a closed loop with respect to the high-pressure process gas line, with the inflow side connected to the discharge line and the outflow side connected to the suction line. That is, the process gas in the discharge line 38 is depressurized to a suction pressure (about 5 to 20 MPa) by a pressure reducing device 37 constituted by a discharge throttle valve, and then flows into the oil collecting system 20. After the oil is collected, it is returned to the suction line 31 to form a closed loop.

  In the oil collecting system 20, the process gas taken from the discharge line 38 is distributed to the cooled collection gas 16 for collecting oil and the heated gas 17 for heating the collected gas. Is done. The cooled collection gas 16 flows into the oil collecting device 20A and is cooled to a low temperature by the liquid nitrogen 22 in the low temperature cooling and collecting unit 2 below the oil collecting device 20A, and the oil is collected at this low temperature state. Be collected. The gas in which the oil has been collected is mixed with the warming gas 17 in the mixing and heating unit 3 at the top of the oil collecting device 20 </ b> A to rise in temperature as the mixed gas 18, and then returned to the suction line 31. Note that the gas heated to 0 ° C. or higher is returned to the suction line 31.

  In addition, if it is necessary to obtain a particularly low temperature gas in the low temperature cooling / collecting unit 2, a precooler 21 for precooling before the cooled collection gas 16 flows into the oil collecting device 20A may be provided. In this case, as the cooling gas for the precooler 21, it is preferable to use the low-temperature nitrogen gas 12b vaporized by the latent heat provided for cooling the low-temperature part in the liquid nitrogen container of the low-temperature cooling collection unit 2.

  If further heating of the gas returned to the suction line 31 is necessary, a heater 23 for heating the gas flowing out from the oil collecting device 20A may be provided. As the heater 23 for further heating the mixed gas, compressed air, water, or the like is used. If the gas pipe extending from the oil collecting device 20A to the suction line 31 is lengthened and naturally heated, a special heating source is not required and a simple and inexpensive structure can be obtained.

  In addition, 20 A of oil content collection apparatuses are provided with the heating part 1 after the precooling, and the gas flowing into the heating part 1 after the precooling and the gas flowing out are heat-exchanged. As a result, the gas flowing into the low-temperature cooling / collecting unit 2 is pre-cooled, and the gas flowing out from the low-temperature cooling / collecting unit 2 is post-heated. According to this, it becomes possible to perform the heating aiming at the gas cooling to the required temperature and the recovery to the required suction temperature only by the oil collecting device 20A.

  According to the present embodiment, the inflow side of the oil collecting system 20 (in other words, the oil collecting device 20A) is connected to the discharge line 38, and the outflow side thereof is connected to the suction line 31. Since it has the low temperature cooling collection part 2 which cools to low temperature and collects the oil component in the process gas, it can collect | acquire the very small amount of oil in a high pressure gas safely accurately. That is, since the process gas taken in from the discharge line 38 is cooled to a low temperature at which an oil saturated vapor pressure capable of collecting an extremely small oil amount is obtained and collected, the oil content is collected. Can be collected. In addition, since the process gas in which the oil is collected is returned to the suction line 31, a gas such as a flammable gas or a toxic gas can be used without incurring gas loss as compared with a case where the oil is released into the atmosphere. Even if is used, it is excellent in safety without causing ignition or air pollution. Furthermore, since the oil collection system 20 is configured in a closed loop with respect to the main body system 30, it is possible to perform an oil collection operation for a long time, and to collect a very small amount of oil with high accuracy. it can.

  In addition, since the oil collecting system 20 is connected to the discharge line 38 via the pressure reducing device 37, the oil collecting system 20 can be made closer to the pressure of the suction line 31 than the pressure of the discharge line 38 to collect the oil. As a result, the pre-cooling heating unit 1, the low-temperature cooling / collecting unit 2, and the mixing and heating unit 3 (in other words, the oil collecting device 20A) can be made simple and inexpensive.

  Furthermore, since the mixing and heating unit 3 for branching and mixing part of the process gas flowing from the discharge gas line 38 is provided on the outflow side of the low-temperature cooling and collecting unit 2, the process gas can be used as a heat source. As a result, the temperature of the process gas after oil collection can be raised and returned to the suction line 31 with a simple and inexpensive structure.

  Furthermore, since the pre-cooling heating unit 1 for exchanging heat between the process gas in the inflow side passage to the low temperature cooling collection unit 2 and the process gas in the outflow side passage from the low temperature cooling collection unit 2 is provided, Precooling and post-heating of the process gas with respect to the cooling collection part 2 can be efficiently performed with a simple and inexpensive structure.

  Next, the oil collecting device 20A will be described with reference to FIGS. 2 is a longitudinal sectional view of the oil collecting device of FIG. 1, and FIG. 3 is an AA sectional view of FIG.

  The oil content collecting device 20A is composed of a mixing and heating unit 3, a pre-cooling heating unit 1 and a low-temperature cooling collection unit 2, and is linearly arranged in this order from the top. The containers 6, 4, and 15 that form the pre-cooling heating unit 1, the low-temperature cooling collection unit 2, and the mixed heating unit 3 are detachably connected by fasteners 41 and 42. Further, among the parts constituting the oil content collecting apparatus 20A, all the parts through which the process gas flows are formed of pressure-resistant members.

  The pre-cooling heating unit 1 includes a pre-cooling heating unit container 4, an upper part of the tube 5, a lower part of the mixed heating unit inner cylinder 14, a tube support component 8, a tube fixing part 12 and a gas temperature. And a total of 13 units.

  The pre-cooling warming portion container 4 has a hole penetrating vertically in the center, and flange portions 4a and 4b are formed on the periphery of the upper and lower portions. In the flange portion 4a, a passage through which the cooled collection gas 16 flows is formed so as to reach from the side surface to the central hole.

  The upper part of the copper tube 5 is inserted into the central hole of the outer container 4 with a gap. The inside of the tube 5 is configured as a passage of the cooled and collected gas 16 to the low temperature cooling and collecting unit 2, and the gap between the tube 5 and the precooled heating unit container 4 is the process gas from the low temperature cooling and collecting unit 2. It is configured as a passage. As a result, the process gas in the inflow side passage to the low temperature cooling collection part 2 and the process gas in the outflow side passage from the low temperature cooling collection part can be heat-exchanged via the tube 5. A plurality of fins 5 b extending vertically are provided on the outer periphery of the upper portion of the tube 5.

  The tube fixing part 12 is attached to the upper end part of the tube 5 and supported by the mixing and heating part inner cylinder 14. Thereby, the upper part of the tube 5 is supported by the mixing and heating part inner cylinder 14 via the tube fixing part piece 12. A passage for introducing the cooled and collected gas 16 into the tube 5 is formed in the tube fixing piece 12.

  The tube support component 8 is welded to the tube 5 in the vicinity of the mating surface between the low-temperature cooling collection unit 2 and the pre-cooling / heating heat exchanger 1, and is supported by the heating unit container 4 after pre-cooling. Thus, the central portion of the tube 5 is supported by the mixing and heating portion inner cylinder 14 via the tube support component 8. A gas passage hole is formed in the tube support component 8.

  The lower part of the mixed warming portion inner cylinder 14 is inserted into the central hole of the warming portion container 4 after pre-cooling, and is attached via an O-ring. The mixed heating portion inner cylinder 14 is formed with a passage that communicates the passage of the flange portion 15 a and the passage of the tube fixing piece 12. As a result, the cooled and collected gas 16 flows from the passage of the flange portion 4 a into the passage in the tube 5 through the passage of the mixed heating portion inner cylinder 14 and the passage of the tube fixing portion 12.

  The low-temperature cooling / collecting unit 2 includes a low-temperature cooling / collecting unit container 6, a flange 9, a lower portion of the tube 5, and a granular material 7. The low-temperature cooling and collecting unit 2 is configured to be immersed in the liquid nitrogen 11 injected into the liquid nitrogen container 10 and cooled to the low temperature by the liquid nitrogen 11. The tube 5 is used in common across the low-temperature cooling collection unit 2 and the pre-cooling heating unit 1.

  The low-temperature cooling / collecting part container 6 has an upper surface opened at the center and a hole extending to the lower end part, and a flange 9 is integrally fixed to the outer periphery of the upper part. For the outer container 6, a material having a higher thermal conductivity is more suitable, but on the other hand, a strength or a structure capable of handling high-pressure gas is also required. Therefore, the outer container 6 is supported and fixed by a flange 9 using a SUS material which is a strength material. As a result, the load applied to the outer container 6 can be only a simple tensile load, and the shape dimension (outer diameter here) can be reduced to allow the application of the copper alloy material.

  The flange 9 is provided so as to be detachable from the flange portion 4 b by a fastener 41, and is provided to be detachable from the liquid nitrogen container 10 by a fastener 43. Therefore, by removing the fasteners 41 and 43, the pre-cooling heating unit 1, the low-temperature cooling collection unit 2, and the liquid nitrogen container 10 can be separated, and the low-temperature cooling collection unit 2 and the liquid nitrogen container 10 are separated. Can also be separated.

  The lower part of the tube 5 is inserted into the central hole of the outer container 6 of the low-temperature cooling / collecting part 2 with a gap, and extends so as to reach the lower end of the central hole. In addition, the upper part and the lower part of the tube 5 are formed with one tube. A large number of pores 5 c are provided near the tip of the tube 5. In the gap between the outer container 6 and the lower portion of the tube 5, for example, granular materials 7 such as glass beads are packed. The granular material 7 is stored up to the vicinity of the liquid surface of the liquid nitrogen 11. In addition, the granular material 7 may use the ball | bowl made from SUS aiming at the cooling performance improvement by heat conduction instead of a glass bead. By suppressing the passage speed of the process gas through the granular material 7 and increasing the contact surface area of the granular material 7 with the process gas as shown in FIG. 3, the liquefied or solidified oil component can be captured.

  The mixed warming unit 3 includes a mixed warming unit outer container 15 and an upper part of the mixed warming unit inner cylinder 14. The mixed heating unit inner cylinder 14 is shared by the pre-cooling heating unit 1 and the mixed heating unit 3.

  The mixing and heating unit outer container 15 is formed with a hole penetrating vertically in the center, and a flange portion 15a is formed at the lower periphery. A passage through which the heated gas 17 flows is formed in the flange portion 15a so as to reach from the side surface to the central hole. Further, a passage through which the mixed gas 18 flows is formed on the upper surface of the mixed warming portion outer container 15.

  The upper part of the mixed warming portion inner cylinder 14 is inserted into the central hole of the mixed warming portion outer container 15 and is mounted via an O-ring. The upper end portion of the mixed warming portion inner cylinder 14 is disposed in the mixed warming portion outer container 15 with a gap. The mixed warming portion inner cylinder 14 is formed with a passage that communicates the passage of the flange portion 15 a and the gap in the mixed warming portion outer container 15. Thus, the warming gas 17 flows from the passage of the flange portion 15 a into the gap in the mixed warming portion outer container 15 through the passage of the mixed warming portion inner cylinder 14. Further, the mixed warming portion inner cylinder 14 is formed with a passage that connects the gap in the preheated warming portion container 4 and the gap in the mixed warming portion outer container 15. As a result, the post-warmed process gas flows from the gap in the pre-cooling warming portion container 4 into the gap in the mixed warming portion outer container 15 through the passage of the mixed warming portion inner cylinder 14. Accordingly, the post-warmed process gas is mixed with the warmed gas 17 and further warmed.

  Next, operations related to cooling and collection of the process gas in the oil collection system 20 will be described with reference to FIG. FIG. 4 is an explanatory diagram of the cooling / heating balance of the oil collecting system 20 of the present embodiment.

  The process gas (hydrogen gas) decompressed through the decompression device 37 from the discharge line 38 is taken into the oil collecting system 20 at about 40 ° C. and then half of the cooled collection gas 16 and the heated gas 17. Branches one by one.

  The branched collection gas 16 to be cooled is cooled to about 11 ° C. by the precooler 21, and then flows into the tube 5 from the upper part of the pre-cooling heating unit 1. The cooled trapped gas 16 flows down to the liquid surface of the liquid nitrogen 11 while being cooled by the process gas that has been cooled and returned by the heating unit 1 after pre-cooling, and is cooled to about −16 ° C. Is done.

  The cooled collection gas 16 is cooled by the process gas that has been cooled and returned when flowing down from the liquid surface of the liquid nitrogen 11, and from the packed granular material 7 to the liquid nitrogen 11. While being cooled by the passing heat conduction, it reaches the tip of the tube 5 and is cooled to about −41 ° C.

  Furthermore, the cooled collection gas 16 that has passed through the pores 5 c near the tip of the tube 5 rises to the upper surface of the granular material 7 (that is, the liquid surface of the liquid nitrogen 11) while passing through the gaps between the granular materials 7. At this time, the cooled collection gas 16 is collected with the very small oil adhering to the surface of the granular material 7 while being cooled to a low temperature of about −41 ° C. by the liquid nitrogen 11. According to this embodiment, the gas temperature can be reduced to −40 ° C. or lower while operating under a pressure of 5 MPa or higher. Therefore, with a general lubricating oil, the saturated oil content in the gas can be reduced to 0.01 ppm or lower. It can be cooled and can collect and measure the amount of mixed oil of at least 0.1 ppm order.

  The cooled collection gas 16 that has flowed upward from the granular material 7 moves up the outer periphery of the tube 5 in the low-temperature cooling collection unit 2 and the pre-cooling heating unit 1, while the cooled collection gas 16 in the tube 5. The mixture is heated to about −13 ° C. through heat exchange, and then flows into the mixing and heating unit 3.

  The cooled and collected gas 16 flowing into the mixed warming unit 3 is mixed with the warmed gas 17 flowing into the mixed warming unit 3 and heated to about 11 ° C. to become a mixed gas 18 and an oil collecting device. Outflow from 20A. The mixed gas 18 that has flowed out is heated to about 30 ° C. by the heater 23, returned to the suction line 31, and sucked into the first stage compressor 32.

  The gas temperature of the granular material 7 in the low-temperature cooling / collecting section 2 can be cooled to a temperature at which an oil saturated vapor pressure of at least one-tenth or less of the permissible oil content to be measured is obtained, and the suction temperature at the compressor inlet is Each department is set to be at least 0 ° C or higher.

  According to the present embodiment, heat exchange is performed between the low-temperature cooling collection unit 2 and the process gas in the inflow side passage to the low-temperature cooling collection unit 2 and the process gas in the outflow side passage from the low-temperature cooling collection unit 2. A pre-cooling warming section 1 provided in the above and a mixed warming section 3 provided so as to branch and mix part of the process gas flowing from the discharge gas line to the outflow side of the low-temperature cooling collection section 2. Since they are integrally formed in this order, the inflow process gas can be pre-cooled and the outflow process gas can be pre-cooled to the low-temperature cooling collection section 2 with a simple and inexpensive structure, and the process gas after oil collection can be The temperature can be raised and returned to the suction line.

It is a figure explaining the structure of the high pressure gas compression system of one Example of this invention, and the flow of process gas. It is a longitudinal cross-sectional view of the oil content collection apparatus of FIG. It is AA sectional drawing of FIG. It is explanatory drawing of the cooling and heating balance of the oil component collection system of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Warming part after pre-cooling, 2 ... Low temperature cooling collection part, 3 ... Mixing warming part, 4 ... Warming part after pre-cooling, 5 ... Tube, 5b ... Fin, 5c ... Fine pore, 6 ... Low temperature Cooling collection container, 7 ... granular material, 8 ... tube support component, 9 ... flange, 10 ... liquid nitrogen container, 11 ... liquid nitrogen, 12 ... tube fixing piece, 13 ... gas thermometer, 14 ... mixing and heating Internal cylinder, 15 ... mixing and heating unit outer container, 16 ... cooled collection gas, 17 ... warming gas, 18 ... mixed gas, 20 ... oil content collection system, 20A ... oil content collection device, 21 ... precooler, ( 22b ... low temperature nitrogen gas) 23 ... heater, 24 ... heated fluid, 30 ... main body system, 30A ... compressor, 31 ... suction line, 32 ... single stage compressor, 33 ... two stage compressor, 34 ... compression drive 35 ... gas cooler, 36 ... gas filter, 37 ... decompression device, 38 ... discharge Inn, 41, 42, 43 ... fasteners.

Claims (7)

An oil-lubricated compressor that sucks and compresses high-pressure process gas from a suction line;
In a high-pressure gas compression system comprising a gas filter that filters the oil in the process gas discharged from the compressor and sends it to a discharge line,
An oil collecting system for collecting the oil in the process gas by flowing the process gas of the discharge line that has passed through the gas filter is provided,
The oil collecting system has an inflow side connected to the discharge line, an outflow side connected to the suction line, and the inflow process gas is cooled to a low temperature to collect the oil in the process gas. A high-pressure gas compression system comprising a low-temperature cooling collection part.   The high-pressure gas compression system according to claim 1, wherein the oil collecting system is connected to the discharge line via a decompression device.   The high-pressure gas compression system according to claim 1 or 2, further comprising a mixing and heating unit that branches and mixes part of the process gas flowing from the discharge line on the outflow side of the low-temperature cooling and collecting unit. A high-pressure gas compression system.   The high-pressure gas compression system according to any one of claims 1 to 3, wherein a heat exchange is performed between the process gas in the inflow side passage to the low temperature cooling collection portion and the process gas in the outflow side passage from the low temperature cooling collection portion. A high pressure gas compression system provided with a heating part after cooling. An oil-lubricated compressor that sucks and compresses high-pressure process gas from a suction line, and a gas filter that filters oil in the process gas discharged from the compressor and sends the oil to the discharge line. Used,
In the oil collecting device for collecting the oil in the process gas by flowing the process gas of the discharge line that has passed through the gas filter,
An inflow portion connected to the discharge line, an outflow side connected to the suction line, and a low-temperature cooling collection portion that cools the inflowing process gas to a low temperature and collects oil in the process gas. A characteristic oil collecting device.   6. The oil content collection apparatus according to claim 5, wherein the low temperature cooling collection unit, the process gas in the inflow side passage to the low temperature cooling collection unit, and the process gas in the outflow side passage from the low temperature cooling collection unit are heated. A pre-cooling heating unit provided to be exchanged, and a mixing heating unit provided to branch and mix part of the process gas flowing from the discharge line to the outflow side of the low-temperature cooling collection unit; Are integrally formed in this order. An oil-lubricated compressor that sucks and compresses high-pressure process gas from a suction line, and a gas filter that filters oil in the process gas discharged from the compressor and sends the oil to the discharge line. Used,
In the oil collecting method of collecting the oil in the process gas by flowing the process gas of the discharge line that has passed through the gas filter,
The process gas is allowed to flow from the discharge line into the low-temperature cooling collection unit, the process gas flowing in the low-temperature cooling collection unit is cooled to a low temperature and oil in the process gas is collected, and then the process gas is added to the process gas. An oil collecting method characterized by flowing into a suction line.

Images