A methanol generator liquid return monitoring device and method

Abstract

This invention discloses a methanol generator return liquid monitoring device and method, relating to the field of methanol generator return liquid monitoring technology. The methanol generator return liquid monitoring device includes a first collection tank with an inlet pipe at its top. A second collection tank is located on one side of the first collection tank, and a connecting pipe connects the first and second collection tanks. A second solenoid valve is located at the upper end of the connecting pipe, and the connecting pipe is made of metal. A first support assembly is located on the other side of the first collection tank, and a second support assembly is located on one side of the second collection tank. This solution solves the problem that existing methanol generator return liquid collection methods, while providing alarms when large quantities are collected, cannot promptly address the return liquid issue. Continuous collection can cause high pressure in the collection tank, damaging the interface; incontinent collection necessitates stopping the generator, affecting normal operation.

Description

Technical Field

[0001] This invention relates to the field of methanol generator liquid return monitoring technology, specifically to a methanol generator liquid return monitoring device and method. Background Technology

[0002] Methanol generator liquid return refers to the phenomenon of methanol fuel flowing back into the generator system. In some methanol generator designs, the fuel system includes a recovery function. Unburned methanol gas is liquefied through a cooling heat exchanger and returned to the collection tank to participate in the fuel supply cycle. This design aims to improve fuel utilization and reduce waste.

[0003] For example, the Chinese authorized patent with announcement number CN113482768A (A High-Efficiency, Low-Emission Methanol Generator) includes a methanol generator body. Positioning plates are fixedly installed at the bottom of both sides of the methanol generator body. A through groove is opened in the middle of the top of each of the two positioning plates. Positioning frames are slidably installed in each of the two through grooves. A positioning disk is fixedly installed at one end of the top of each of the two positioning frames, and the top end of each positioning frame is fixedly connected to both ends of the outer wall of the positioning disk. A collection cover is fixedly installed at the bottom of the positioning disk. This invention uses a motor fixed to one side of the side plate to drive a screw fixed at one end to rotate. Simultaneously, the screw rotates, causing the positioning seat threaded to the outer wall to move back and forth. This allows the gases emitted by the methanol generator body to be collected in the induced draft fan, thus purifying the emitted gases and preventing the reduction in the working efficiency of the methanol generator due to different physical changes in the gases, thereby increasing the practicality of the methanol generator.

[0004] Existing methanol generators collect liquid back into a collection tank. When the amount is large, an alarm is triggered to alert the user. However, the liquid back cannot be processed in a timely manner. Continuous collection can easily cause high pressure in the collection tank, resulting in damage to the interface. If collection is not continuous, the generator needs to be stopped, affecting normal operation. Therefore, we provide a methanol generator liquid back monitoring device and method. Summary of the Invention

[0005] The purpose of this invention is to provide a methanol generator return liquid monitoring device and method to solve the problems mentioned in the background art, where existing methanol generator return liquid falls into the collection tank and is collected. When the amount is large, an alarm is triggered to remind the user, but the return liquid cannot be processed in time. Continuous collection can easily cause high pressure in the collection tank, resulting in damage to the interface. If collection is not continuous, the generator operation needs to be stopped, affecting normal use.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a methanol generator liquid return monitoring device, comprising a first collection tank, an inlet pipe at the top of the first collection tank, a second collection tank on one side of the first collection tank, a connecting pipe between the first and second collection tanks, a second solenoid valve at the upper end of the connecting pipe, and the connecting pipe being made of metal; a first support assembly on the other side of the first collection tank, a second support assembly on one side of the second collection tank; a first level gauge at the upper end of the first collection tank, and a second level gauge at the upper end of the second collection tank.

[0007] Preferably, both the first and second collection tanks include an extension body. A discharge pipe is provided on one side of the extension body of the second collection tank. A first solenoid valve is provided at the upper end of the discharge pipe. An upper cylinder is provided on the upper surface of the extension body, and a lower cylinder is provided on the lower surface of the extension body. Both the first and second collection tanks are hollow structures.

[0008] Preferably, the upper surface of the upper cylinder is provided with an installation socket, and the monitoring ends of the first liquid level gauge and the second liquid level gauge are inserted into the installation sockets of the first collection tank and the second collection tank, respectively. The outside of the installation socket is provided with screw holes, and the first liquid level gauge and the second liquid level gauge are fixed to the screw holes by external screws.

[0009] Preferably, the first collection tank further includes a first discharge pipe, which is located on the lower surface of the lower cylinder of the first collection tank. The second collection tank further includes a second discharge pipe, which is located on the lower surface of the lower cylinder of the second collection tank, and the discharge end of the second discharge pipe is connected to the first discharge pipe.

[0010] Preferably, the first support component includes a first support frame, the upper end of which is provided with a first connecting seat; the second support component includes a second support frame, the upper end of which is provided with a second connecting seat; one side surface of the second connecting seat is provided with an installation notch; and the inner top walls of both the first and second support frames are provided with limiting base plates.

[0011] Preferably, a top plate is pressed down on one side of the top of both the first connecting seat and the second connecting seat, and a limiting space is formed between the limiting bottom plate and the pressing top plate. An arc groove is provided on one side surface of both the limiting bottom plate and the pressing top plate.

[0012] Preferably, bolt holes are provided on the upper surfaces of both ends of the first support frame and the second support frame, and hexagonal bolts are provided on the upper ends of both ends of the first connecting seat and the second connecting seat. The first connecting seat and the second connecting seat are fixed to the first support frame and the second support frame respectively by hexagonal bolts and bolt holes.

[0013] Preferably, the first support assembly further includes a first adjusting frame, which is welded to the inner wall of the first support frame near the bottom. The second support assembly further includes a second adjusting frame, which is welded to the inner wall of the second support frame near the bottom. The height of the first adjusting frame is lower than that of the second adjusting frame. The upper surface of the first adjusting frame contacts the lower surface of the second adjusting frame. An adjusting groove is provided at the center of both the first and second adjusting frames, and the adjusting groove passes through both the first and second adjusting frames. A fixing bolt is inserted into the adjusting groove, and the insertion end of the fixing bolt passes through the adjusting groove and is threadedly connected to a nut.

[0014] Preferably, a fixing plate is provided on one side of the bottom end of both the first support frame and the second support frame, and multiple fixing plates are provided.

[0015] Preferably, a monitoring method for a methanol generator liquid return monitoring device includes the following steps:

[0016] Step 1: Weld a metal connecting pipe between the first collection tank and the second collection tank, and insert the first level gauge and the second level gauge into the first collection tank and the second collection tank respectively, and fix them with screws;

[0017] Step 2: Then, adjust the distance between the first support assembly and the second support assembly according to the distance between the first collection tank and the second collection tank. During adjustment, the first adjustment frame and the second adjustment frame move in alignment.

[0018] Step 3: Place the first collection tank and the second collection tank on the first support assembly and the second support assembly respectively. When placing them, place them on the limiting base plates of the first support frame and the second support frame respectively. Push the first support frame and the second support frame in opposite directions until they can no longer be pushed. Then tighten the fixing bolts to fix the first support frame and the second support frame.

[0019] Step 4: Install the first connecting seat and the second connecting seat on the first support frame and the second support frame respectively, and press the lower pressure plates of the first connecting seat and the second connecting seat against the first collection tank and the second collection tank respectively, and then tighten the hex bolts;

[0020] Step 5: The liquefied methanol gas is diverted from the feed pipe into the first collection tank. The return liquid volume is monitored using the first level gauge. If the volume exceeds the predetermined value, the PLC sends an electrical signal to open the second solenoid valve and issue an alarm. The terminal connected to the PLC has an alarm. The return liquid flows into the second collection tank through the connecting pipe. The return liquid volume is monitored using the second level gauge. If the volume exceeds the predetermined value, the PLC sends an electrical signal to open the first solenoid valve. The return liquid is discharged from the generator through the discharge pipe.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] (1) This invention connects the first and second collection tanks via a metal connecting pipe, and monitors the amount of backflow collected in the first and second collection tanks respectively using a first level gauge and a second level gauge. When the backflow in the first collection tank exceeds a predetermined value, the PLC sends an electrical signal to open the second solenoid valve and issue an alarm. The backflow then flows from the connecting pipe into the second collection tank, thus achieving a diversion effect, preventing the first collection tank from being damaged by high pressure due to continuous backflow, improving safety, facilitating timely maintenance, and preventing waste of backflow. The second collection tank uses a second level gauge to monitor the backflow amount, and when it exceeds a predetermined value, the PLC sends an electrical signal to activate the valve. Opening the first solenoid valve allows the return liquid to be discharged from the generator through the discharge pipe, landing on the ground for easy visibility. This prevents excessive pressure damage to the first and second collection tanks, extending their service life. Furthermore, it prevents the methanol generator from stopping operation when the first and second collection tanks are full, and also ensures normal operation. This solves the problems of existing methanol generators where return liquid falls into the collection tanks, requiring alarms to alert staff when the volume is large, but not timely processing; continuous collection can cause high pressure in the collection tanks leading to interface damage; and discontinuing collection necessitates stopping the generator, affecting normal operation.

[0023] (2) By setting a first support component and a second support component at the lower end of the first collection tank and the second collection tank respectively, the first collection tank and the second collection tank are placed on the limiting base plate of the first support frame and the second support frame respectively. The first support frame and the second support frame are pushed in opposite directions until they can no longer be pushed. The first adjustment frame and the second adjustment frame are fixed by tightening the fixing bolts, which also fixes the first support frame and the second support frame. This is suitable for first collection tanks and second collection tanks of different sizes, improving applicability and flexibility. By pressing down the first collection tank and the second collection tank with the pressure plate of the first connecting seat and the second connecting seat respectively, and tightening the hexagonal bolts to fix them, the first collection tank and the second collection tank are pressed down and fixed, instead of fixing by drilling and damaging the surface, which is less likely to damage the first collection tank and the second collection tank and improves the service life. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the connection structure between the first collection tank and the second collection tank of the present invention;

[0026] Figure 3 This is a schematic diagram of the disassembled structure of the first collection tank and the first level gauge of the present invention;

[0027] Figure 4 This is a schematic diagram of the connection structure between the first support component and the second support component of the present invention;

[0028] Figure 5 This is a schematic diagram of the disassembled structure of the first support frame and the second support frame with the first connecting seat and the second connecting seat of the present invention;

[0029] In the diagram: 1. First collecting tank; 2. Second collecting tank; 3. First support assembly; 4. Second support assembly; 5. First level gauge; 6. Second level gauge; 7. Connecting pipe; 8. Feed pipe; 9. Discharge pipe; 10. First solenoid valve; 11. Extension body; 12. Upper cylinder; 13. Lower cylinder; 14. First discharge pipe; 15. Second discharge pipe; 16. Mounting socket; 17. Screw hole; 18. First support frame; 19. First connecting seat; 20. Second support frame; 21. Second connecting seat; 22. Limiting base plate; 23. Lower pressure top plate; 24. Arc groove; 25. Limiting space; 26. Hex bolt; 27. Fixing plate; 28. First adjusting frame; 29. ​​Second adjusting frame; 30. Adjusting groove; 31. Fixing bolt; 32. Bolt hole; 33. Second solenoid valve; 34. Mounting notch. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] Please see Figure 1-5One embodiment of the present invention provides a methanol generator liquid return monitoring device, comprising a first collection tank 1, an inlet pipe 8 at the top of the first collection tank 1, a second collection tank 2 on one side of the first collection tank 1, a connecting pipe 7 between the first collection tank 1 and the second collection tank 2, a second solenoid valve 33 at the upper end of the connecting pipe 7, and the connecting pipe 7 being made of metal; a first support assembly 3 on the other side of the first collection tank 1, a second support assembly 4 on one side of the second collection tank 2; a first level gauge 5 at the upper end of the first collection tank 1, a second level gauge 6 at the upper end of the second collection tank 2; both the first collection tank 1 and the second collection tank 2 include an extension body 11; a discharge pipe 9 on one side of the extension body 11 of the second collection tank 2, a first solenoid valve 10 at the upper end of the discharge pipe 9; and an upper cylindrical part on the upper surface of the extension body 11. The lower surface of the body 12 and the extension body 11 is provided with a lower cylinder 13, and both the first collection tank 1 and the second collection tank 2 are hollow structures. The collection volume of the first collection tank 1 and the second collection tank 2 is increased by the extension body 11. The upper surface of the upper cylinder 12 is provided with a mounting socket 16, and the monitoring ends of the first liquid level gauge 5 and the second liquid level gauge 6 are inserted into the mounting socket 16 of the first collection tank 1 and the second collection tank 2 respectively. The outside of the mounting socket 16 is provided with a screw hole 17, and the first liquid level gauge 5 and the second liquid level gauge 6 are fixed to the screw hole 17 by external screws. The first liquid level gauge 5 and the second liquid level gauge 6 monitor the amount of return liquid collected inside the first collection tank 1 and the second collection tank 2 respectively. The first liquid level gauge 5 and the second liquid level gauge 6 are both float-type liquid level gauges, and the first liquid level gauge 5 and the second liquid level gauge 6 are both controlled by a PLC system.

[0032] The first collecting tank 1 also includes a first discharge pipe 14, which is located on the lower surface of the lower cylinder 13 of the first collecting tank 1. The second collecting tank 2 also includes a second discharge pipe 15, which is located on the lower surface of the lower cylinder 13 of the second collecting tank 2, and the discharge end of the second discharge pipe 15 is connected to the first discharge pipe 14. Figure 2 As shown, it is used for fluid return and drainage operations;

[0033] The first support assembly 3 includes a first support frame 18, with a first connecting seat 19 at its upper end. The second support assembly 4 includes a second support frame 20, with a second connecting seat 21 at its upper end. A mounting notch 34 is provided on one side surface of the second connecting seat 21. Limiting base plates 22 are provided on the inner top walls of both the first support frame 18 and the second support frame 20. Top plates 23 are pressed down on one side of the top of both the first connecting seat 19 and the second connecting seat 21, forming a limiting space 25 between the limiting base plate 22 and the pressing top plate 23. This limiting space 25 provides a clamping and limiting fixing effect for the first collecting tank 1 and the second collecting tank 2. Figure 1As shown, one side surface of the limiting base plate 22 and the pressing top plate 23 is provided with an arc groove 24 to accommodate the shape of the first collection tank 1 and the second collection tank 2. The upper surfaces of both ends of the first support frame 18 and the second support frame 20 are provided with bolt holes 32. The upper ends of both ends of the first connecting seat 19 and the second connecting seat 21 are provided with hexagonal bolts 26. The first connecting seat 19 and the second connecting seat 21 are fixed to the first support frame 18 and the second support frame 20 respectively by the hexagonal bolts 26 and the bolt holes 32. By fixing the first connecting seat 19 and the second connecting seat 21, the first collection tank 1 and the second collection tank 2 are pressed down and fixed.

[0034] The first support assembly 3 further includes a first adjusting frame 28, which is welded to the inner wall of the first support frame 18 near its bottom end. The second support assembly 4 further includes a second adjusting frame 29, which is welded to the inner wall of the second support frame 20 near its bottom end. The height of the first adjusting frame 28 is lower than that of the second adjusting frame 29. The upper surface of the first adjusting frame 28 contacts the lower surface of the second adjusting frame 29. An adjusting groove 30 is provided at the center of both the first adjusting frame 28 and the second adjusting frame 29, and the adjusting groove 30 penetrates through the first adjusting frame 28 and the second adjusting frame 29. A fixing bolt 31 is inserted into the adjusting groove 30, and the insertion end of the fixing bolt 31 passes through... The adjusting groove 30 is connected to the threaded nut, which supports and fixes the first collecting tank 1 and the second collecting tank 2 through the first support component 3 and the second support component 4, preventing the first collecting tank 1 and the second collecting tank 2 from separating and falling off. The fixing is done by pressing down, rather than drilling holes in the surface of the first collecting tank 1 and the second collecting tank 2, which will damage the fixing and improve the service life. It is also easy to disassemble and replace quickly. The bottom side surface of the first support frame 18 and the second support frame 20 are provided with fixing plates 27, and multiple fixing plates 27 are provided. The fixing plates 27 are connected to the ground by external bolts, thereby fixing the first support frame 18 and the second support frame 20 to the ground.

[0035] Please see Figure 1-5 A monitoring method for a methanol generator liquid return monitoring device includes the following steps:

[0036] Step 1: Weld a metal connecting pipe 7 between the first collection tank 1 and the second collection tank 2, and insert the first level gauge 5 and the second level gauge 6 into the first collection tank 1 and the second collection tank 2 respectively, and fix them with screws;

[0037] Step 2: Then, adjust the distance between the first support assembly 3 and the second support assembly 4 according to the distance between the first collection tank 1 and the second collection tank 2. During the adjustment, the first adjustment frame 28 and the second adjustment frame 29 are aligned and moved.

[0038] Step 3: Place the first collection tank 1 and the second collection tank 2 on the first support assembly 3 and the second support assembly 4. When placing them, place them on the limiting base plate 22 of the first support frame 18 and the second support frame 20 respectively. Push the first support frame 18 and the second support frame 20 in opposite directions until they can no longer be pushed. Then tighten the fixing bolts 31 to fix the first support frame 18 and the second support frame 20.

[0039] Step 4: Install the first connecting seat 19 and the second connecting seat 21 on the first support frame 18 and the second support frame 20 respectively, and press down the top plates 23 of the first connecting seat 19 and the second connecting seat 21 on the first collection tank 1 and the second collection tank 2 respectively, and then tighten the hexagonal bolts 26.

[0040] Step 5: The liquefied methanol gas is diverted from the feed pipe 8 into the first collection tank 1. The return liquid volume is monitored by the first level gauge 5. If the return liquid volume exceeds the predetermined value, the PLC sends an electrical signal to open the second solenoid valve 33 and issue an alarm. The terminal connected to the PLC has an alarm. The return liquid flows into the second collection tank 2 from the connecting pipe 7. The return liquid volume is monitored by the second level gauge 6. If the return liquid volume exceeds the predetermined value, the PLC sends an electrical signal to open the first solenoid valve 10. The return liquid is discharged from the generator from the discharge pipe 9.

[0041] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A methanol generator liquid return monitoring device, comprising a first collection tank (1), wherein a feed pipe (8) is provided at the top of the first collection tank (1), characterized in that: A second collection tank (2) is provided on one side of the first collection tank (1), and a connecting pipe (7) is provided between the first collection tank (1) and the second collection tank (2). A second solenoid valve (33) is provided at the upper end of the connecting pipe (7), and the connecting pipe (7) is made of metal. A first support assembly (3) is provided on the other side of the first collection tank (1), and a second support assembly (4) is provided on one side of the second collection tank (2). A first level gauge (5) is provided at the upper end of the first collection tank (1), and a second level gauge (6) is provided at the upper end of the second collection tank (2). The first collection tank (1) and the second collection tank (2) both include an extension body (11). A discharge pipe (9) is provided on one side of the extension body (11) of the second collection tank (2). A first solenoid valve (10) is provided at the upper end of the discharge pipe (9). An upper cylinder (12) is provided on the upper surface of the extension body (11), and a lower cylinder (13) is provided on the lower surface of the extension body (11). Both the first collection tank (1) and the second collection tank (2) are hollow structures. The first collection tank (1) further includes a first discharge pipe (14), and the first discharge pipe (14) is located on the lower surface of the lower cylinder (13) of the first collection tank (1). The second collection tank (2) further includes a second discharge pipe (15), and the second discharge pipe (15) is located on the lower surface of the lower cylinder (13) of the second collection tank (2). The discharge end of the second discharge pipe (15) is connected to the first discharge pipe (14).

2. The methanol generator liquid return monitoring device according to claim 1, characterized in that: The upper surface of the upper cylinder (12) is provided with an installation socket (16), and the monitoring ends of the first liquid level gauge (5) and the second liquid level gauge (6) are respectively inserted into the installation socket (16) of the first collection tank (1) and the second collection tank (2). The outside of the installation socket (16) is provided with a screw hole (17), and the first liquid level gauge (5) and the second liquid level gauge (6) are fixed to the screw hole (17) by external screws.

3. The methanol generator liquid return monitoring device according to claim 2, characterized in that: The first support component (3) includes a first support frame (18), and a first connecting seat (19) is provided at the upper end of the first support frame (18). The second support component (4) includes a second support frame (20), and a second connecting seat (21) is provided at the upper end of the second support frame (20). An installation notch (34) is provided on one side surface of the second connecting seat (21). A limiting base plate (22) is provided on the inner wall of the top of both the first support frame (18) and the second support frame (20).

4. The methanol generator liquid return monitoring device according to claim 3, characterized in that: The top of the first connecting seat (19) and the second connecting seat (21) are both pressed down on one side of the top plate (23), and a limiting space (25) is formed between the limiting bottom plate (22) and the pressing top plate (23). A circular arc groove (24) is provided on one side surface of the limiting bottom plate (22) and the pressing top plate (23).

5. The methanol generator liquid return monitoring device according to claim 4, characterized in that: Bolt holes (32) are provided on the upper surfaces of both ends of the first support frame (18) and the second support frame (20). Hex bolts (26) are provided on the upper ends of both ends of the first connecting seat (19) and the second connecting seat (21). The first connecting seat (19) and the second connecting seat (21) are fixed to the first support frame (18) and the second support frame (20) respectively by the hex bolts (26) and the bolt holes (32).

6. The methanol generator liquid return monitoring device according to claim 5, characterized in that: The first support assembly (3) further includes a first adjustment frame (28), and the first adjustment frame (28) is welded to the inner wall of the first support frame (18) near the bottom. The second support assembly (4) further includes a second adjustment frame (29), and the second adjustment frame (29) is welded to the inner wall of the second support frame (20) near the bottom. The height of the first adjustment frame (28) is lower than that of the second adjustment frame (29). The upper surface of the first adjustment frame (28) is in contact with the lower surface of the second adjustment frame (29). An adjustment groove (30) is provided at the center of both the first adjustment frame (28) and the second adjustment frame (29). The adjustment groove (30) passes through the first adjustment frame (28) and the second adjustment frame (29). A fixing bolt (31) is inserted into the inside of the adjustment groove (30), and the insertion end of the fixing bolt (31) passes through the adjustment groove (30) and is threaded to a nut.

7. The methanol generator liquid return monitoring device according to claim 6, characterized in that: The first support frame (18) and the second support frame (20) are both provided with a fixing plate (27) on one side of their bottom ends, and multiple fixing plates (27) are provided.

8. A monitoring method for a methanol generator liquid return monitoring device, based on the methanol generator liquid return monitoring device according to claim 7, characterized in that, Includes the following steps: Step 1: Weld a metal connecting pipe (7) between the first collection tank (1) and the second collection tank (2), and insert the first level gauge (5) and the second level gauge (6) into the first collection tank (1) and the second collection tank (2) respectively, and fix them with screws; Step 2: Then adjust the distance between the first support assembly (3) and the second support assembly (4) according to the distance between the first collection tank (1) and the second collection tank (2). During the adjustment, the first adjustment frame (28) and the second adjustment frame (29) move in alignment. Step 3: Place the first collection tank (1) and the second collection tank (2) on the first support assembly (3) and the second support assembly (4). When placing them, place them on the limiting base plate (22) of the first support frame (18) and the second support frame (20) respectively. Push the first support frame (18) and the second support frame (20) in opposite directions until they can no longer be pushed. Then tighten the fixing bolts (31) to fix the first support frame (18) and the second support frame (20). Step 4: Install the first connecting seat (19) and the second connecting seat (21) on the first support frame (18) and the second support frame (20) respectively, and press down the top plate (23) of the first connecting seat (19) and the second connecting seat (21) on the first collection tank (1) and the second collection tank (2) respectively, and then tighten the hexagonal bolt (26). Step 5: The liquefied methanol gas is diverted from the feed pipe (8) into the first collection tank (1). The return liquid volume is monitored by using the first level gauge (5). When the return liquid volume exceeds the predetermined value, the PLC sends an electrical signal to open the second solenoid valve (33) and issue an alarm. The terminal connected to the PLC has an alarm. The return liquid flows from the connecting pipe (7) into the second collection tank (2). The return liquid volume is monitored by using the second level gauge (6). When the return liquid volume exceeds the predetermined value, the PLC sends an electrical signal to open the first solenoid valve (10). The return liquid is discharged from the generator through the discharge pipe (9).

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