Device for preventing air outlet of oxygen extraction fan from condensing and returning water

Abstract

The utility model belongs to the technical field of PEM water electrolysis hydrogen production, and particularly relates to a device for preventing an air outlet of an oxygen extraction fan from condensing and returning water, which comprises a double-pipe heat exchanger, a water inlet pipe, a water outlet pipe, a water inlet pipe, a water outlet pipe, a water outlet pipe, a water outlet pipe, a water outlet pipe and a water outlet pipe, and is characterized in that the double-pipe heat exchanger comprises an inner pipe communicated with the air outlet of the oxygen extraction fan and an outer pipe spirally sleeved on the outer wall of the inner pipe and used for allowing a cooling medium to pass through; and the automatic drainage device is communicated with the bottom of the inner pipe and is used for collecting and draining condensate water flowing down from the inner pipe. According to the utility model, the risk that equipment is damaged due to the fact that oxygen is rich in moisture and dew flows back to the fan under the high-temperature condition when the oxygen extraction fan works in a low-temperature environment is avoided, and the system safety is improved; meanwhile, the device is simple in structure and convenient to install, equipment cost and maintenance difficulty are reduced, and the device is suitable for differential pressure PEM water electrolysis hydrogen production systems of different standard parties and has wide application prospects.

Description

Technical Field

[0001] The utility model belongs to the technical field of PEM water electrolysis hydrogen production, and particularly relates to a device for preventing condensation and water backflow at an air outlet of an oxygen extraction blower. Background Art

[0002] In a PEM electrolysis hydrogen production system, the electrolyzer decomposes water into hydrogen and oxygen. The system primarily purifies the hydrogen, outputting high-purity hydrogen. However, due to low production, low purity, and customer demand, the oxygen is often discharged into a tank along with the water. Later, an oxygen extraction fan is used to remove the oxygen from the system to prevent it from accumulating and potentially posing a risk. However, due to the exothermic reaction in the electrolyzer, the oxygen extracted from the oxygen extraction fan is warm and contains a high water content. When the system is operated in autumn and winter, extreme cold, or at high altitudes, the large temperature difference in the pumped air can easily cause the air at the outlet to reach its dew point, resulting in condensation on the inner walls of the outlet ductwork and even freezing and frost in pipes far from the system. If this condensation and frost are not removed promptly, it can flow back into the fan. Prolonged freezing can cause cracks in downstream piping, damaging the fan and disrupting its normal operation.

[0003] The existing technology lacks an effective solution to prevent this situation from happening. Therefore, it is necessary to provide a device that can prevent condensation and water backflow at the air outlet of the oxygen extraction fan. Utility Model Content

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a device for preventing condensation and water backflow at the air outlet of an oxygen extraction fan, comprising:

[0005] A shell-and-tube heat exchanger comprising an inner tube connected to the air outlet of the oxygen extraction blower, and an outer tube spirally sleeved on the outer wall of the inner tube for passing the cooling medium;

[0006] An automatic drainage device is connected to the bottom of the inner tube and is used to collect and drain the condensed water flowing down the inner tube.

[0007] As a preferred device for preventing condensation and backwater from the air outlet of the oxygen extraction fan of the present invention, the automatic drainage device has a main shell with a hollow structure inside, and a float is movably arranged in the hollow structure. The top and bottom of the main shell are respectively provided with an upper water outlet and a lower water outlet connected to the internal hollow structure. The upper water outlet is connected to the bottom of the inner tube, and the float can movably seal the lower water outlet.

[0008] The utility model discloses a device for preventing condensate water from returning to the outlet of an oxygen extraction fan, which comprises a main casing, an inner tube, a hollow structure, a water collecting groove, a three-way pipe, a first connecting port, a second connecting port, a third connecting port and an automatic drainage device.

[0009] The utility model discloses a device for preventing condensate water from returning to the outlet of an oxygen extraction fan, which comprises a main casing, an inner tube, a hollow structure, a water collecting groove, a three-way pipe, a first connecting port, a second connecting port, a third connecting port and an automatic drainage device.

[0010] The utility model discloses a device for preventing condensate water from returning to the outlet of an oxygen extraction fan, which comprises a main casing, an inner tube, a hollow structure, a water collecting groove, a three-way pipe, a first connecting port, a second connecting port, a third connecting port and an automatic drainage device.

[0011] The utility model discloses a device for preventing condensate water from returning to the outlet of an oxygen extraction fan, which comprises a main casing, an inner tube, a hollow structure, a water collecting groove, a three-way pipe, a first connecting port, a second connecting port, a third connecting port and an automatic drainage device.

[0012] Compared with the prior art, the utility model has the advantages of:

[0013] The utility model avoids the risk of equipment damage caused by oxygen-rich moisture and backflow of the fan under high-temperature conditions in the oxygen extraction fan working under low-temperature environment, improves the system safety, and has simple structure, convenient installation, low equipment cost and maintenance difficulty, and is suitable for different standard differential pressure PEM electrolytic water hydrogen production systems, and has wide application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, and are used together with embodiments of the utility model to explain the utility model, and do not constitute the limitation to the utility model. In the drawings:

[0015] Figure 1 It is the schematic diagram of the connection structure of the utility model and oxygen extraction fan;

[0016] Figure 2 It is the perspective structure schematic diagram of the utility model;

[0017] Figure 3 It is the structure schematic diagram of the utility model's sleeve type heat exchanger;

[0018] Figure 4 It is the automatic drainage device section structure schematic diagram of the utility model;

[0019] Figure 5This is a structural schematic diagram of the utility model in which a shell-and-tube heat exchanger is connected to an automatic drainage device through a flange and a tee pipe fitting.

[0020] In the figure: 1. Oxygen extraction fan; 3. T-piece; 31. First connection port; 32. Second connection port; 33. Third connection port; 4. Shell-and-tube heat exchanger; 41. Inner tube; 42. Outer tube; 5. Automatic drainage device; 51. Main shell; 52. Upper water inlet; 53. Lower water inlet; 54. Boss; 55. Float; 6. Flange. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] The utility model relates to a device for preventing condensation and water backflow from the air outlet of an oxygen extraction fan. Figures 1-3 As shown, including:

[0023] The shell-and-tube heat exchanger 4 includes an inner tube 41 connected to the air outlet of the oxygen extraction fan 1, an outer tube 42 spirally sleeved on the outer wall of the inner tube 41 for passing the cooling medium, and an automatic drainage device 5 connected to the bottom of the inner tube 41. The automatic drainage device 5 is used to collect and discharge the condensed water flowing down from the inner tube 41.

[0024] Specifically, outer tube 42 of the double-tube heat exchanger 4 is connected to an external cooling medium, such as cooling water or an air circulation system. The surface of inner tube 41 of the double-tube heat exchanger 4 contacts the hot air blown out of the oxygen extraction blower 1, while the surface of outer tube 42 contacts the cooling medium. Due to the cooling medium, the surface temperature of inner tube 41 decreases, thereby increasing the temperature difference between the inner wall of the pipe and the air, accelerating the formation of condensed water on the inner wall of the pipe.

[0025] like Figure 4 As shown, the automatic drainage device 5 has a main shell 51 with a hollow structure inside, and a float 55 is movably arranged in the hollow structure. The top and bottom of the main shell 51 are respectively provided with an upper water outlet 52 and a lower water outlet 53 connected to its internal hollow structure. The upper water outlet 52 is connected to the bottom of the inner tube 41, and the float 55 can movably seal the lower water outlet 53.

[0026] Specifically, when the condensate water in the inner tube 41 continuously flows into the main shell 51 through the upper water inlet 52, the float ball 55 is deep in water, and a large buoyancy is generated to make the float ball 55 rise, at this time, the lower water outlet 53 is opened, and the condensate water is discharged through the lower water outlet 53; after the condensate water is discharged, the float ball 55 is shallow in water, and the buoyancy is small, and the float ball 55 falls on the top of the lower water outlet 53 under the action of gravity to seal the lower water outlet 53.

[0027] Further, as shown in Figure 4 order to ensure the sealing effect of the float ball 55 on the lower water outlet 53, a boss 54 extending axially into the hollow structure is arranged along the inner wall of the lower water outlet 53, and the boss 54 cooperates with the inner wall of the main shell 51 to form an annular water collecting groove (marked in the figure), and the condensate water in the inner tube 41 can be collected in the annular water collecting groove to form a water seal with the float ball 55, thereby improving the sealing effect to prevent oxygen leakage.

[0028] Further, as shown in Figure 5 order to improve the detachability and connection strength between the double-pipe heat exchanger 4, the automatic drainage device 5 and the oxygen extraction fan 1, a tee pipe fitting 3 can be used for connection, specifically, the tee pipe fitting 3 has a second connecting port 32 and a third connecting port 33 arranged oppositely and in communication, and a first connecting port 31 in communication with the second connecting port 32 and the third connecting port 33, the first connecting port 31 is in communication with the outlet of the oxygen extraction fan 1, and the second connecting port 32 and the third connecting port 33 are in communication with the inner tube 41 and the upper water inlet 52 of the automatic drainage device 5 respectively, and it is required to ensure that the double-pipe heat exchanger 4 is located above the automatic drainage device 5, which not only facilitates the downward flow of the condensate water, but also facilitates the upward flow of the gas; at the same time, the first connecting port 31, the second connecting port 32 and the third connecting port 33 and the corresponding connecting ends are connected through flanges 6 to improve the connection strength, and due to the detachability of the flanges 6, the double-pipe heat exchanger 4, the automatic drainage device 5 and the oxygen extraction fan 1 are convenient to disassemble and clean.

[0029] Finally, it should be noted that: the above only describes the preferred embodiments of the present application, and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, and for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A device to prevent condensation backflow at the air outlet of an oxygen extraction fan, characterized in that: include: A shell-and-tube heat exchanger (4), the shell-and-tube heat exchanger (4) comprising an inner tube (41) connected to an air outlet of an oxygen extraction fan (1), and an outer tube (42) spirally sleeved on an outer wall of the inner tube (41) for passing a cooling medium; An automatic drainage device (5) is connected to the bottom of the inner tube (41) and is used to collect and drain condensed water flowing down the inner tube (41).

2. The device for preventing condensation and water backflow from the air outlet of the oxygen extraction fan according to claim 1, characterized in that: The automatic drainage device (5) comprises a main shell (51) with a hollow structure inside, wherein a float (55) is movably arranged in the hollow structure. An upper water outlet (52) and a lower water outlet (53) communicating with the hollow structure inside the main shell (51) are respectively provided at the top and bottom thereof. The upper water outlet (52) is communicated with the bottom of the inner tube (41), and the float (55) can movably seal the lower water outlet (53).

3. The device for preventing condensation and water backflow from the air outlet of the oxygen extraction fan according to claim 2, characterized in that: A boss (54) is also provided along the inner wall of the lower water opening (53) and extends axially into the hollow structure to cooperate with the inner wall of the main shell (51) to form an annular water collecting trough.

4. The device for preventing condensation and water backflow from the air outlet of the oxygen extraction fan according to claim 1, characterized in that: A three-way pipe fitting (3) is provided between the inner tube (41) and the air outlet of the oxygen extraction fan (1), and the three-way pipe fitting (3) has a second connecting port (32) and a third connecting port (33) that are arranged opposite to and communicate with each other, and a first connecting port (31) that is communicated with the second connecting port (32) and the third connecting port (33).

5. The device for preventing condensation and water backflow from the air outlet of the oxygen extraction fan according to claim 4, characterized in that: The first connection port (31) is connected to the air outlet of the oxygen extraction fan (1), and the second connection port (32) and the third connection port (33) are respectively connected to the inner tube (41) and the automatic drainage device (5).

6. The device for preventing condensation and water backflow from the air outlet of the oxygen extraction fan according to claim 5, characterized in that: The second connection port (32) and the inner tube (41), as well as the third connection port (33) and the automatic drainage device (5), are both detachably connected via flanges (6).

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