Gas separation system

Abstract

The utility model relates to the technical field of gas separation, in particular to a gas separation system which comprises a separator. A first separation cavity and a second separation cavity are formed in the separator; a filtering cavity is formed in the first separation cavity, the air inlet end of the filtering cavity is communicated with an air inlet formed in the first separation cavity, and the air outlet end of the filtering cavity is communicated with the second separation cavity; the first separation cavity is sequentially provided with a first liquid level sensor and a second liquid level sensor from bottom to top, the first liquid level sensor is in signal connection with a first automatic blow-down valve arranged in the first separation cavity, and the second liquid level sensor is in signal connection with a first alarm unit; a first manual blow-down valve is arranged at the bottom of the first separation cavity; a filter assembly is arranged in the second separation cavity, and the first separation cavity is communicated with the second separation cavity through the filter assembly; and an air outlet is formed in the second separation cavity. The whole system filters gas twice, the separation efficiency is guaranteed, meanwhile, an automatic and manual pollution discharge mechanism is arranged, oil in the first separation cavity is discharged in time, and normal operation of the system is guaranteed.

Description

Technical Field

[0001] The present disclosure relates to the technical field of gas separation, and in particular to a gas separation system. Background Art

[0002] In a reciprocating compressor, the gas generated by the compressor often needs to be reprocessed before entering the next system to ensure the cleanliness of the gas, so as to avoid affecting the next system. In traditional gas processing devices, more emphasis is usually placed on filtering the moisture in the gas, while the filtering of oil and gas in the gas is relatively weak. In addition, the oil or oil-water mixture generated after filtration often accumulates in the gas processing device and cannot be discharged in time, thereby affecting the normal operation of the gas processing device and reducing the gas processing efficiency. Utility Model Content

[0003] In order to solve the above technical problems or partially solve the above technical problems, the present disclosure provides a gas separation system.

[0004] The present disclosure provides a gas separation system, comprising a separator;

[0005] The separator is provided with a first separation chamber and a second separation chamber inside, wherein the first separation chamber is located below the second separation chamber;

[0006] The first separation chamber is provided with an air inlet at the top and a first automatic drain valve at the bottom. A filter chamber is provided inside the first separation chamber. The air inlet end of the filter chamber is communicated with the air inlet, and the air outlet end of the filter chamber is communicated with the first separation chamber. A first liquid level sensor and a second liquid level sensor are provided in the first separation chamber from bottom to top. The first liquid level sensor is connected to the first automatic drain valve signal, and the second liquid level sensor signal is connected to the first alarm unit. A first manual drain valve is provided at the bottom of the first separation chamber.

[0007] A filter assembly is provided in the second separation chamber, and the first separation chamber and the second separation chamber are communicated with each other through the filter assembly; an air outlet is provided at the top of the second separation chamber.

[0008] Optionally, a third liquid level sensor is provided in the first separation chamber above the second liquid level sensor, and the third liquid level sensor is used to be connected to a switch signal for controlling the start and stop of the separation system.

[0009] Optionally, a second automatic drain valve is provided in the second separation chamber;

[0010] A fourth liquid level sensor is disposed in the second separation chamber, and the fourth liquid level sensor is connected to the second automatic sewage valve by signal.

[0011] Optionally, the second separation chamber is provided with a fifth liquid level sensor above the fourth liquid level sensor, and the fifth liquid level sensor signal is connected to a second alarm unit;

[0012] A second manual drain valve is provided at the bottom of the second separation chamber.

[0013] Optionally, it also includes a sewage pipe, and the first automatic sewage valve, the first manual sewage valve, the second manual sewage valve, and the second automatic sewage valve are all connected to the sewage pipe.

[0014] Optionally, a first support plate is provided in the filter cavity, and the filter cavity is arranged on the first support plate;

[0015] The filter chamber is provided with a plurality of filter blades which are spaced apart in sequence, and the filter blades are extended vertically or inclined relative to the horizontal direction; a spacer cavity for gas to pass through is formed between two adjacent filter blades, and a group of opposite openings of the spacer cavity are respectively facing the air inlet end and the air outlet end; the downward opening of the spacer cavity passes through the first support plate and is connected to the first separation chamber.

[0016] Optionally, along the airflow direction, the filtering blades are wavy.

[0017] Optionally, a vortex chamber is provided on the flow-incoming side of each waveform in the filter blade, and the vortex chamber has an opening communicating with the spacing chamber.

[0018] Optionally, the filter assembly includes several groups of filter elements;

[0019] A second support plate is provided between the first separation chamber and the second separation chamber, a filter hole is provided on the second support plate, and one end of the filter element facing the first separation chamber is installed in the filter hole.

[0020] Optionally, a first visual liquid level meter is provided in the first separation chamber; and a second visual liquid level meter is provided in the second separation chamber.

[0021] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0022] In the gas separation system provided by the present disclosure, the gas first enters the filter chamber in the first separation chamber, and after being filtered in the filter chamber, the gas will enter the second separation chamber upward, and be filtered through the filter component, and finally discharged. In this process, the oil or oil-water liquid mixture filtered in the filter chamber will fall into the first separation chamber. Under the gradual accumulation, when the liquid level of the oil or oil-water liquid mixture reaches the first liquid level sensor, the first automatic drain valve is started to drain the liquid. When the first automatic drain valve fails unexpectedly, the subsequent liquid level will reach the second liquid level sensor and trigger an alarm, thereby reminding the staff to manually drain the sewage. The entire separation system performs secondary filtration on the gas to better separate the residual oil and water in the gas. At the same time, automatic and manual drain mechanisms are set up to ensure the timely removal of the oil or oil-water mixed liquid in the first separation chamber, thereby ensuring the normal operation of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 A schematic diagram of the operating principle of the gas separation system according to an embodiment of the present disclosure;

[0026] Figure 2 This is a schematic diagram of the structure of a separator in a gas separation system according to an embodiment of the present disclosure;

[0027] Figure 3 for Figure 2 Schematic diagram of the middle AA section;

[0028] Figure 4 for Figure 2 Schematic diagram of the BB cross section.

[0029] in,

[0030] 1. First separation chamber; 10. Filter chamber; 100. Filter blade; 11. Air inlet; 12. First liquid level sensor; 120. First automatic drain valve; 121. First liquid level control switch; 13. Second liquid level sensor; 130. First alarm unit; 14. Third liquid level sensor; 15. First manual drain valve; 16. First visual liquid level gauge; 2. Second separation chamber; 20. Air outlet; 21. Second manual drain valve; 22. Second automatic drain valve; 221. Second liquid level control switch; 220. Fourth liquid level sensor; 23. Fifth liquid level sensor; 24. Second alarm unit; 25. Filter assembly; 250. Filter element; 26. Second visual liquid level gauge; 3. Blind plate; 4. Second support plate; 5. First support plate; 6. Drain pipe. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0034] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0037] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0038] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0039] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] Reference Figure 1 to Figure 2 As shown, a gas separation system provided in this embodiment includes a separator; a first separation chamber 1 and a second separation chamber 2 are provided inside the separator, and the first separation chamber 1 is located below the second separation chamber 2.

[0041] The entire separator is a columnar cavity structure with a sealed bottom and an openable blind plate 3 on the top to facilitate the installation of the internal components of the separator and subsequent maintenance.

[0042] An air inlet 11 is provided at the top of the first separation chamber 1, and a first automatic drain valve 120 is provided at the bottom. A filter chamber 10 is provided inside the first separation chamber 1. The air inlet end of the filter chamber 10 is connected with the air inlet 11, and the air outlet end of the filter chamber 10 is connected with the first separation chamber 1; a first liquid level sensor 12 and a second liquid level sensor 13 are provided in the first separation chamber 1 from bottom to top, the first liquid level sensor 12 is connected to the first automatic drain valve 120 by signal, and the second liquid level sensor 13 is connected to the first alarm unit 130 by signal; a first manual drain valve 15 is provided at the bottom of the first separation chamber 1.

[0043] The gas enters from the air inlet 11 in the first separation chamber 1, and after entering, it first reaches the filter chamber 10 for filtration. In actual situations, the gas entering from the air inlet 11 will enter the filter chamber 10 from the air inlet end of the filter chamber 10, and after being filtered, it will flow out from the air outlet end of the filter chamber 10 to complete the first filtration; the gas generated in the filter chamber 10 will pass through the first separation chamber 1 and then enter the second separation chamber 2 to participate in the next filtration, and the oil or oil-water mixed liquid generated in the filter chamber 10 will gradually accumulate inside the first separation chamber 1. As the filtration continues, the first The amount of liquid in the separation chamber 1 will increase. When the liquid level reaches the first liquid level sensor 12, the first automatic drain valve 120 will automatically open to drain the sewage. In addition, in some cases, if the first liquid level sensor 12 or the first automatic drain valve 120 or both fail, the liquid level will continue to rise until it reaches the second liquid level sensor 13. At this time, the first alarm unit 130 connected to the second liquid level sensor 13 will sound an alarm to remind the staff to deal with it in time. Specifically, the sewage can be drained by manually controlling the first manual drain valve 15.

[0044] The process of the first liquid level sensor 12 controlling the opening of the first automatic drain valve 120 can be realized through the first liquid level control switch 121. Specifically, the first automatic drain valve 120 can be a pneumatic automatic valve or an electric automatic valve. The entire control principle can be realized by relying on a PLC program.

[0045] A filter assembly 25 is provided in the second separation chamber 2, and the first separation chamber 1 and the second separation chamber 2 are interconnected through the filter assembly 25; an air outlet 20 is provided at the top of the second separation chamber 2; the gas passing through the first separation chamber 1 enters the filter assembly 25 for filtering again, and then the gas will be discharged through the air outlet 20. In actual situations, the air outlet position in the filter assembly 25 is lower than the air outlet 20 in the second separation chamber 2 to ensure that the gas discharged from the air outlet 20 is all filtered gas.

[0046] In addition, the above descriptions of “top” and “bottom” only indicate that the corresponding components are arranged at positions close to the “top” and “bottom”.

[0047] The entire separation system performs secondary filtration on the gas to better separate the residual oil and water in the gas. At the same time, automatic and manual sewage discharge mechanisms are set up to ensure the timely discharge of oil or oil-water mixed liquid in the first separation chamber 1 to ensure the normal operation of the entire system.

[0048] In some embodiments, a third liquid level sensor 14 is provided above the second liquid level sensor 13 in the first separation chamber 1 , and the third liquid level sensor 14 is used to be connected to a switch signal for controlling the start and stop of the separation system.

[0049] A third liquid level sensor 14 is also arranged above the second liquid level sensor 13. The third liquid level sensor 14 is connected to a switch signal for controlling the start and stop of the separation system. If one or both of the second liquid level sensor 13 and the first alarm unit 130 fails, the liquid level will continue to rise. When it reaches the third liquid level sensor 14, the third liquid level sensor 14 will directly control the entire separation system to shut down to avoid causing a greater safety accident.

[0050] In some embodiments, a second automatic sewage valve 22 is provided in the second separation chamber 2 ; a fourth liquid level sensor 220 is provided in the second separation chamber 2 , and the fourth liquid level sensor 220 is connected to the second automatic sewage valve 22 by signal.

[0051] Specifically, under the action of the filter component 25, oil or oil-water mixed liquid will also appear in the second separation chamber 2. In order to further ensure the discharge of the liquid in the second separation chamber 2, a second automatic drain valve 22 and a fourth liquid level sensor 220 are arranged in the second separation chamber 2. When the liquid level accumulated in the second separation chamber 2 reaches the height of the fourth liquid level sensor 220, the second automatic drain valve 22 will open to discharge sewage, thereby ensuring the normal progress of the separation work.

[0052] In some embodiments, the second separation chamber 2 is provided with a fifth liquid level sensor 23 above the fourth liquid level sensor 220 , and the signal of the fifth liquid level sensor 23 is connected to the second alarm unit 24 ; and a second manual drain valve 21 is provided at the bottom of the second separation chamber 2 .

[0053] Specifically, if one or both of the fourth liquid level gauge sensor or the second automatic drain valve 22 fails, the liquid level will continue to rise. When it reaches the fifth liquid level sensor 23, the second alarm unit 24 will sound an alarm to remind the staff to take action, such as opening the second manual drain valve 21 at the bottom of the second separation chamber 2 to ensure that the separation work is carried out normally.

[0054] The fourth liquid level sensor 220 can control the second automatic drain valve 22 to open through the second liquid level control switch 221. The second automatic drain valve 22 can be a pneumatic automatic valve or an electric automatic valve. The entire control principle can be implemented by setting the relevant PLC program based on actual conditions.

[0055] In some embodiments, a sewage pipe 6 is also included, and the first automatic sewage valve 120 , the first manual sewage valve 15 , the second manual sewage valve 21 , and the second automatic sewage valve 22 are all connected to the sewage pipe 6 .

[0056] To facilitate the subsequent further treatment of the oil-water mixture, the first automatic drain valve 120, the first manual drain valve 15, the second manual drain valve 21, and the second automatic drain valve 22 are all connected to the drain pipe 6 in a branch manner to achieve unified treatment of the liquid, which is more environmentally friendly.

[0057] In some embodiments, a first support plate 5 is provided in the filter chamber 10, and the filter chamber 10 is arranged on the first support plate 5; a plurality of filter blades 100 are provided in the filter chamber 10 and are spaced apart from each other in sequence, and the filter blades 100 are vertically extended or inclined relative to the horizontal direction; a partition cavity for gas to pass through is formed between two adjacent filter blades 100, and a group of opposite openings of the partition cavity are respectively facing the air inlet end and the air outlet end; the downward opening of the partition cavity passes through the first support plate 5 and is connected to the first separation chamber 1.

[0058] Specifically, the first support plate 5 is horizontally arranged, and its edge can be directly connected to the inner wall of the first separation chamber 1 by welding. However, it should be noted that the first support plate 5 does not divide the first separation chamber 1 in the up and down directions, but is only appropriately connected to fix itself and support the filter chamber 10 at the same time.

[0059] Reference Figure 3 to Figure 4 As shown, a plurality of filter blades 100 are provided at intervals in the filter chamber 10. In some embodiments, the filter blades 100 may be vertically extended to form an interval cavity between two adjacent filter blades 100. The interval cavity is used for gas circulation. For example, in a group of opposing openings of the interval cavity, one opening is connected to the air inlet end of the filter chamber 10, and the other opening is connected to the air outlet end of the filter chamber 10. The gas flows in the plurality of groups of interval cavities and collides with the side walls of the filter blades 100 at the same time, and condenses the oil or water it carries on the filter blades 100, thereby filtering the gas. The oil or oil-water mixture on the filter blades 100 will drip downward under the action of gravity, that is, drip from the lower end opening of the interval cavity, and finally pass through the opening reserved on the first support plate 5 into the first separation chamber 1, thereby separating the gas.

[0060] In some other embodiments, the filter blades 100 may also be inclined relative to the horizontal direction, which may also achieve gas filtering.

[0061] In order to further ensure that the gas can pass through the spacing cavity as fully as possible before entering the first separation cavity 1, the top sealing setting of the filter cavity 10, that is, the top opening of the spacing cavity is in a sealed state, so as to maximize the guarantee that the airflow passes through the entire spacing cavity completely and ensure the separation effect of the liquid in the gas.

[0062] In some embodiments, the filter blades 100 are wavy along the airflow direction; the wavy filter blades 100 can increase the collision probability between the airflow and the filter blades 100, thereby ensuring the separation effect of the liquid in the gas.

[0063] In some embodiments, a vortex chamber is provided on the flow-facing side of each waveform in the filter blade 100, and the vortex chamber has an opening connected to the spacing cavity; in order to further increase the airflow's ability to fully collide with the filter blade 100, a vortex chamber is provided at each waveform in the filter blade 100, that is, at the side of the bend relative to the direction of movement of the airflow, and an opening is provided on the vortex chamber, and the airflow flowing in the spacing cavity will enter the vortex chamber. Since there is only one opening between the vortex chamber and the spacing cavity, the airflow entering the vortex chamber will swirl to a certain extent before flowing out from the opening. After this swirl process, the airflow impacts the filter blade 100 more times than before, thereby further improving the separation effect of liquid in gas.

[0064] In some embodiments, the filter assembly 25 includes several groups of filter elements 250, a second support plate 4 is provided between the first separation chamber 1 and the second separation chamber 2, a filter hole is provided on the second support plate 4, and the filter element 250 is installed in the filter hole at one end facing the first separation chamber 1.

[0065] Specifically, the filter element 250 can be a columnar structure, and its end facing the first separation chamber 1 is installed in the filter hole set on the second support plate 4. The gas entering the filter element 250 is filtered by the filter element 250, and the gas passes through the filter element 250 into the second separation chamber 2, and the oil or oil-water mixture in the gas will be adsorbed or condensed on the filter material of the filter element 250, and finally become droplets that seep out of the filter element 250. When too much accumulation occurs, it will be discharged through the second automatic drain valve 22 or the second manual drain valve 21.

[0066] The provision of the filter element 250 allows the gas to be filtered again, thereby improving the gas-liquid separation effect.

[0067] In some embodiments, a first visual liquid level gauge 16 is provided in the first separation chamber 1; a second visual liquid level gauge 26 is provided in the second separation chamber 2; both the first liquid level gauge and the second liquid level gauge are used for staff to observe the liquid accumulation in the first separation chamber 1 and the second separation chamber 2.

[0068] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas separation system, characterized in that: Including separator; A first separation chamber (1) and a second separation chamber (2) are provided inside the separator, wherein the first separation chamber (1) is located below the second separation chamber (2); The first separation chamber (1) is provided with an air inlet (11) at the top and a first automatic drain valve (120) at the bottom; a filter chamber (10) is provided inside the first separation chamber (1); the air inlet end of the filter chamber (10) is communicated with the air inlet (11), and the air outlet end of the filter chamber (10) is communicated with the first separation chamber (1); a first liquid level sensor (12) and a second liquid level sensor (13) are provided in the first separation chamber (1) from bottom to top; the first liquid level sensor (12) is connected to the first automatic drain valve (120) in signal communication, and the second liquid level sensor (13) is connected to the first alarm unit (130) in signal communication; a first manual drain valve (15) is provided at the bottom of the first separation chamber (1); A filter assembly (25) is provided in the second separation chamber (2), and the first separation chamber (1) and the second separation chamber (2) are communicated with each other through the filter assembly (25); an air outlet (20) is provided at the top of the second separation chamber (2).

2. The gas separation system according to claim 1, wherein: A third liquid level sensor (14) is provided above the second liquid level sensor (13) in the first separation chamber (1). The third liquid level sensor (14) is used to be connected to a switch signal for controlling the start and stop of the separation system.

3. The gas separation system according to claim 1, wherein: A second automatic sewage discharge valve (22) is provided in the second separation chamber (2); A fourth liquid level sensor (220) is provided in the second separation chamber (2), and the fourth liquid level sensor (220) is signal-connected to the second automatic sewage valve (22).

4. The gas separation system according to claim 3, characterized in that The second separation chamber (2) is provided with a fifth liquid level sensor (23) above the fourth liquid level sensor (220), and the signal of the fifth liquid level sensor (23) is connected to a second alarm unit (24); A second manual sewage drain valve (21) is provided at the bottom of the second separation chamber (2).

5. The gas separation system according to claim 4, characterized in that It also includes a sewage pipe (6), and the first automatic sewage valve (120), the first manual sewage valve (15), the second manual sewage valve (21), and the second automatic sewage valve (22) are all connected to the sewage pipe (6).

6. The gas separation system according to claim 1, wherein: A first support plate (5) is provided in the filter cavity (10), and the filter cavity (10) is arranged on the first support plate (5); The filter chamber (10) is provided with a plurality of filter blades (100) distributed in sequence and at intervals, and the filter blades (100) are vertically extended or inclined relative to the horizontal direction; a spacer cavity for gas to pass through is formed between two adjacent filter blades (100), and a group of opposite openings of the spacer cavity are respectively oriented towards the air inlet end and the air outlet end; the downward opening of the spacer cavity passes through the first support plate (5) and is in communication with the first separation chamber (1).

7. The gas separation system according to claim 6, characterized in that Along the airflow direction, the filtering blades (100) are wavy.

8. The gas separation system according to claim 7, characterized in that A vortex cavity is provided on the flow-incoming side of each waveform in the filtering blade (100), and the vortex cavity has an opening communicating with the spacer cavity.

9. The gas separation system according to claim 1, wherein: The filter assembly (25) includes several groups of filter elements (250); A second support plate (4) is provided between the first separation chamber (1) and the second separation chamber (2), a filter hole is provided on the second support plate (4), and one end of the filter element (250) facing the first separation chamber (1) is installed in the filter hole.

10. The gas separation system according to claim 1, wherein: A first visual liquid level meter (16) is provided in the first separation chamber (1); and a second visual liquid level meter (26) is provided in the second separation chamber (2).

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