Pressure vessel liquid level monitoring device and water electrolysis hydrogen production equipment

Abstract

The utility model belongs to the technical field of liquid level monitoring, and particularly relates to a pressure vessel liquid level monitoring device and water electrolysis hydrogen production equipment. A positive pressure chamber of a differential pressure transmitter is connected with a lower sampling port of a pressure vessel through a pipeline I provided with a valve I; the side face of the isolation tank is connected with an upper sampling opening of the pressure container through a second pipeline provided with a second valve, and the bottom of the isolation tank is connected with a negative pressure chamber of the differential pressure transmitter through a third pipeline. The connecting position of the communicating pipe and the first pipeline is located between the first valve and the differential pressure transmitter, the connecting position of the communicating pipe and the second pipeline is located between the second valve and the isolation tank, one end of the first liquid discharging pipe is connected with the third pipeline, the connecting position is located on the third pipeline and located between the isolation tank and the differential pressure transmitter, and a third valve is arranged on the first liquid discharging pipe. According to the differential pressure transmitter, water can be conveniently supplemented into the isolation tank, a basic liquid level can be established, zero drift inspection and calibration can be directly carried out on the differential pressure transmitter, the differential pressure transmitter does not need to be disassembled for inspection and calibration, and maintenance is more convenient and faster.

Description

TECHNICAL FIELD

[0001] The utility model belongs to liquid level monitoring technical field, concretely relates to a pressure vessel liquid level monitoring device and electrolytic water hydrogen production equipment. BACKGROUND

[0002] In the hydrogen production of alkaline electrolytic water, the liquid level control of hydrogen and oxygen separator is extremely important, and the existing technology generally uses differential pressure transmitter for monitoring the liquid level in the pressure vessel. According to the position, the conventional installation mode can be divided into three kinds of no migration, negative migration and positive migration, wherein the negative migration installation mode needs to replace the liquid in the isolation tank, check the water supplement and ensure the liquid level in the isolation tank during the regular maintenance, and the workload is complicated. Moreover, the differential pressure transmitter will have zero point drift in long-term use, so the zero point of the differential pressure transmitter needs to be calibrated to ensure the measurement accuracy during the regular maintenance, and if the debugging is carried out by disassembling, the operation is complicated and the workload is large. UTILITY MODEL CONTENTS

[0003] The technical problem to be solved by the utility model is to provide a pressure vessel liquid level monitoring device and electrolytic water hydrogen production equipment which can conveniently supplement the water in the isolation tank and establish the corresponding height of the basic liquid level, can directly check and calibrate the zero point drift of the differential pressure transmitter, does not need to disassemble the differential pressure transmitter for checking and calibrating, and is more convenient and fast to maintain.

[0004] The utility model provides a pressure vessel liquid level monitoring device, including differential pressure transmitter and isolation tank, the horizontal position of differential pressure transmitter is lower than the lower sampling port of pressure vessel, the positive pressure chamber of differential pressure transmitter is connected with the lower sampling port of pressure vessel through the pipeline one with valve one, the side of isolation tank is connected with the upper sampling port of pressure vessel through the pipeline two with valve two, and the pipeline two and the upper sampling port of pressure vessel are at the same horizontal height, the bottom of isolation tank is connected with the negative pressure chamber of differential pressure transmitter through the pipeline three;

[0005] It further includes a communication pipe and a drain pipe one, the communication pipe connects the pipeline one and the pipeline two, the connection between the communication pipe and the pipeline one is located between the valve one and the differential pressure transmitter, and is at the same horizontal height with the lower sampling port of the pressure vessel, the connection between the communication pipe and the pipeline two is located between the valve two and the isolation tank, one end of the drain pipe one is connected with the pipeline three, the connection is located between the isolation tank and the differential pressure transmitter on the pipeline three, and is at the same horizontal height with the negative pressure chamber of the differential pressure transmitter, and the drain pipe one is provided with a valve three.

[0006] Furthermore, it further includes a drain pipe two, one end of the drain pipe two is connected with the pipeline one, the connection is located between the valve one and the differential pressure transmitter on the pipeline one, and is at the same horizontal height with the lower sampling port of the pressure vessel, and the drain pipe two is provided with a valve four.

[0007] Further, the communication pipe and the drain pipe are connected with the pipe one through a four-way joint.

[0008] Further, the communication pipe and the pipe two are connected through a three-way joint one, and the drain pipe one and the pipe three are connected through a three-way joint two.

[0009] Further, the valve one, the valve two, the valve three and the valve four are all manual valves.

[0010] Further, the valve one and the valve two are ball valves.

[0011] Further, the valve three and the valve four are needle valves.

[0012] Further, the valve one, the valve two, the valve three and the valve four are any one of pneumatic valves, solenoid valves and electric valves.

[0013] Further, the drain pipe one and the drain pipe two are both provided with throttle modules.

[0014] The utility model discloses a kind of electrolytic water hydrogen production equipment, is provided with the pressure vessel liquid level monitoring device as above.

[0015] The utility model discloses beneficial effect is, regular inspection and maintenance, not only can be convenient in isolated tank water supplement and make it establish corresponding height's basis liquid level, simultaneously can simulate the situation that the liquid level height of the passage connected with positive pressure chamber and negative pressure chamber of differential pressure transmitter is same, and directly check and calibrate zero point drift of differential pressure transmitter with this, without differential pressure transmitter is taken down and checked and calibrated, it is more convenient and fast to maintain. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is structural schematic drawing of the utility model pressure vessel liquid level monitoring device implementation mode one.

[0017] Figure 2 It is structural schematic drawing of the utility model pressure vessel liquid level monitoring device implementation mode two.

[0018] In the drawing: 1, pressure vessel; 2, differential pressure transmitter; 3, isolated tank; 4, pipe one; 5, valve one; 6, pipe two; 7, valve two; 8, pipe three; 9, communication pipe; 10, drain pipe one; 11, valve three; 12, drain pipe two; 13, valve four; 14, four-way joint; 15, three-way joint one; 16, three-way joint two; 17, throttle module. DETAILED DESCRIPTION

[0019] As Figure 1 AndFigure 2 As shown in the utility model provides a kind of pressure vessel liquid level monitoring device, including differential pressure transmitter 2, isolation tank 3, intercommunication pipe 9 and drain pipe one 10, the two ends of differential pressure transmitter 2 are corresponding to its positive pressure chamber and negative pressure chamber.

[0020] The horizontal position of the differential pressure transmitter 2 is lower than the lower sampling port of the pressure vessel 1, and the positive pressure chamber of the differential pressure transmitter 2 is connected to the lower sampling port of the pressure vessel 1 through pipeline one 4, and a valve one 5 is arranged on the pipeline one 4. The side of the isolation tank 3 is connected to the upper sampling port of the pressure vessel 1 through pipeline two 6, and a valve two 7 is arranged on the pipeline two 6, and the pipeline two 6 and the upper sampling port of the pressure vessel 1 are at the same horizontal height, and the bottom of the isolation tank 3 is connected to the negative pressure chamber of the differential pressure transmitter 2 through pipeline three 8.

[0021] One end of the intercommunication pipe 9 is connected to the pipeline one 4, and the other end is connected to the pipeline two 6, that is, the pipeline one 4 and the pipeline two 6 are connected through the intercommunication pipe 9, so that the pipeline one 4 and the pipeline two 6 are communicated. Figure 1 And Figure 2 As shown in the utility model, the pipeline one 4 is bent from one end connected to the lower sampling port of the pressure vessel 1 to one end connected to the positive pressure chamber of the differential pressure transmitter 2, and the pipeline one 4 includes a horizontal section at the same horizontal height as the lower sampling port of the pressure vessel 1 and a bent section bent downward to connect the positive pressure chamber of the differential pressure transmitter 2. The connection of the intercommunication pipe 9 and the pipeline one 4 is located between the valve one 5 and the differential pressure transmitter 2 on the pipeline one 4, and is at the same horizontal height as the lower sampling port of the pressure vessel 1, that is, the intercommunication pipe 9 is connected to the horizontal section in the pipeline one 4. The connection of the intercommunication pipe 9 and the pipeline two 6 is located between the valve two 7 and the isolation tank 3 on the pipeline two 6, and since the pipeline two 6 is at the same horizontal height as the upper sampling port of the pressure vessel 1, the connection of the intercommunication pipe 9 and the pipeline two 6 is also at the same horizontal height as the upper sampling port of the pressure vessel 1. One end of the drain pipe one 10 is connected to the pipeline three 8, and the connection is located between the valve one 5 and the differential pressure transmitter 2 on the pipeline three 8, and is at the same horizontal height as the negative pressure chamber of the differential pressure transmitter 2, and a valve three 11 is arranged on the drain pipe one 10.

[0022] When the pressure vessel liquid level monitoring device is periodically checked or maintained, the valve one 5 and the valve three 11 are opened under the condition that the valve one 5, the valve two 7 and the valve three 11 are all closed, and under the working pressure of the pressure vessel 1, the internal liquid flows into the isolation tank 3 along the lower sampling port, the pipeline one 4, the intercommunication pipe 9 and the pipeline two 6, and the lower part of the isolation tank 3 is drained through the pipeline three 8 and the drain pipe one 10, until the water flow discharged from the drain pipe one 10 is stable without air bubbles, at this time the liquid level in the isolation tank 3 is stable, the valve three 11 is closed, and the valve two 7 is opened, so that the water injection to the isolation tank 3 and the establishment of the reference liquid surface in the isolation tank 3 at the same horizontal height as the upper sampling port of the pressure vessel 1 can be completed, which is convenient and fast.

[0023] According to the liquid pressure formula: P = p * g * h, wherein P is the bottom pressure of the liquid, p is the density of the liquid, g is the acceleration of gravity, and h is the liquid level height. When it is necessary to check whether the zero drift of the differential pressure transmitter 2 exists, the valve two 7 is closed, the valve one 5 and the valve three 11 are opened in sequence, and the liquid is discharged along the liquid discharge pipe one 10 until the water flow discharged from the liquid discharge pipe one 10 is stable and no bubbles exist. At this time, the liquid flow in the passage is stable, the communication pipe 9 and the part of the pipeline two 6 located between the communication pipe 9 and the isolation tank 3 are filled with liquid, and the liquid level in the isolation tank 3 is at the same height as the upper sampling port of the pressure container 1. Then the valve three 11 and the valve one 5 are closed. At this time, the liquid levels of the two connected regions of the differential pressure transmitter 2 are the same, that is, the pressures of the two ends of the differential pressure transmitter 2 are the same. If the zero drift of the differential pressure transmitter 2 does not occur, the differential pressure value output by the differential pressure transmitter 2 at this time should be 0 Kpa. By checking the differential pressure value output by the differential pressure transmitter 2, if it is not 0 Kpa, the zero point of the differential pressure transmitter 2 is calibrated.

[0024] Therefore, based on the pressure container liquid level monitoring device of the utility model, during regular inspection and maintenance, not only can the water in the isolation tank 3 be conveniently supplemented and the corresponding height of the basic liquid level be established, but also the condition that the liquid level heights of the positive pressure chamber and the negative pressure chamber of the differential pressure transmitter 2 connected passages are the same can be simulated, and the differential pressure transmitter 2 is directly checked and calibrated for zero drift, without the need to disassemble the differential pressure transmitter 2 for inspection and calibration, so that the maintenance is more convenient and fast.

[0025] In addition, since the principle of the differential pressure transmitter 2 for measuring the liquid level is based on the liquid pressure formula, the accuracy of the differential pressure transmitter 2 for measuring the liquid level is affected by the density and the acceleration of gravity. Even if the differential pressure transmitter 2 is debugged and parameter set before installation, under actual working conditions, if the density of the electrolyte changes, the corresponding liquid level measurement result will be deviated. Therefore, when the density of the electrolyte changes, the density and the acceleration of gravity need to be updated in the corresponding program in the prior art, so as to guarantee the accuracy of the liquid level measurement.

[0026] Based on this, the utility model still includes liquid discharge pipe two 12, one end of the liquid discharge pipe two 12 is connected with the pipeline one 4, the connection is located between the isolation tank 3 and the differential pressure transmitter 2 on the pipeline three 8, and is at the same height as the lower sampling port of the pressure container 1, and the liquid discharge pipe two 12 is provided with the valve four 13.

[0027] According to the liquid pressure formula: P = p * g * h, that is, h1 = P1 / (p * g), wherein, as shown in Figs. Figure 1 and Figure 2 h1 is the height of the liquid level in the pressure container 1 to the upper sampling point, P1 is the measurement value of the differential pressure transmitter 2, p is the density of the liquid, and g is the acceleration of gravity.

[0028] See Figure 1 and Figure 2 As shown in the figure, when the liquid level inside the pressure vessel 1 is at the lowest point (the liquid level is at the lower sampling port), then h1 is equal to h 罐 At this time, the differential pressure transmitter 2 measures P0, according to h 罐 =P0 / (ρ*g),since h 罐 is known data, therefore measuring P0 can obtain the corresponding ρ and g data.

[0029] After the above zero drift check and calibration operation, keep valve one 5 and valve three 11 closed, and open valve two 7 and valve four 13, so that the liquid in the connecting pipe 9 is discharged along the drain pipe two 12, when the liquid in the connecting pipe 9 is completely discharged, close valve four 13, at this time the liquid level in the isolation tank 3 remains unchanged, still at the same level as the upper sampling port of the pressure vessel 1, and since the connecting part of the connecting pipe 9, the drain pipe two 12 and the pipeline one 4 are all at the same level as the lower sampling port of the pressure vessel 1, the liquid level height in the passage connected to the positive pressure chamber of the differential pressure transmitter 2 is at the same level as the lower sampling port of the pressure vessel 1, at this time, the state when the liquid level inside the pressure vessel 1 is at the lowest point can be simulated, and the differential pressure value P0 output by the differential pressure transmitter 2 at this time can be used to calculate 1 / (ρ*g)or ρ*g data, which can be updated in the corresponding program.

[0030] Therefore, during regular inspection and maintenance, the utility model can also simulate the case that the liquid level height of the passage connected to the negative pressure chamber of the differential pressure transmitter 2 is at the same level as the upper sampling port of the pressure vessel 1, and the liquid level height of the passage connected to the positive pressure chamber is at the same level as the lower sampling port of the pressure vessel 1, and obtain the current ρ and g data of the liquid by using the differential pressure value output by the differential pressure transmitter 2 at this time and the liquid pressure formula, which can obtain the current density and gravitational acceleration data without changing the structure of the pressure vessel 1 and without adding additional devices inside the pressure vessel 1, so as to update the density and gravitational acceleration data in the corresponding program in time, reduce the liquid level measurement error caused by inaccurate liquid density parameters, and make the liquid level measurement more stable and accurate.

[0031] In the foregoing operation, the liquid discharged along the drain pipe one 10 and the drain pipe two 12 can be recycled by a recycling device and then put into the system where the pressure vessel 1 is located for use.

[0032] In order to facilitate the installation of each valve and the connection of the communication pipe 9, the liquid discharge pipe one 10 and the liquid discharge pipe two 12, the pipeline one 4, the pipeline two 6 and the pipeline three 8 are connected by two or more pipelines. In the utility model, the communication pipe 9 and the liquid discharge pipe two 12 are connected with the pipeline one 4 by a four-way joint 14, the communication pipe 9 is connected with the pipeline two 6 by a three-way joint one 15, and the liquid discharge pipe one 10 is connected with the pipeline three 8 by a three-way joint two 16.

[0033] In an embodiment of the utility model, the valve one 5, the valve two 7, the valve three 11 and the valve four 13 are all manual valves. When the corresponding operation is carried out, the corresponding valve is opened and closed manually. Figure 1 As shown in the figure, in the embodiment, the valve one 5 and the valve two 7 are on-off valves, for example ball valves. The valve three 11 and the valve four 13 are preferably regulating valves, for example needle valves, which can adjust the opening degree.

[0034] In another embodiment of the utility model, the valve one 5, the valve two 7, the valve three 11 and the valve four 13 are any one of pneumatic valves, solenoid valves and electric valves. The valve one 5, the valve two 7, the valve three 11 and the valve four 13 are electrically connected with an external controller, and the corresponding opening and closing are carried out through the external controller. Based on the embodiment, the opening and closing sequence and the time length of the corresponding valve can be preset in the external controller, so that the corresponding automatic operation is realized. Figure 2 As shown in the figure, in the embodiment, the liquid discharge pipe one 10 is provided with a throttling module 17 on the outlet side of the valve three 11, and the liquid discharge pipe two 12 is provided with a throttling module 17 on the outlet side of the valve four 13. The throttling module 17 can be a pressure reducing orifice plate or a throttle valve, so as to reduce the pressure and control the discharge flow rate per unit time when discharging.

[0035] The utility model also provides a kind of hydrogen production equipment of electrolytic water, which is provided with the pressure vessel liquid level monitoring device as described above, and in the hydrogen production equipment of electrolytic water, the pressure vessel 1 is hydrogen, oxygen separator.

[0036] Those skilled in the art should understand that the above discussion of any embodiment is only exemplary and is not intended to limit the scope of protection of the present application to these examples; under the idea of the present application, the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0037] It is intended that the embodiments of the application herein disclosed meet all the written requirements of the patent statutes and come within the judicial doctrines of equivalents and will not be construed to be limited to the embodiments shown and described and by the keeping within the spirit and scope of the embodiments of the application.

Claims

1. A pressure vessel liquid level monitoring device characterized in that: comprising a differential pressure transmitter (2) and an isolation tank (3), the horizontal position of the differential pressure transmitter (2) is lower than the lower sampling port of the pressure vessel (1), the positive pressure chamber of the differential pressure transmitter (2) is connected with the lower sampling port of the pressure vessel (1) through pipeline one (4) provided with valve one (5), the side of the isolation tank (3) is connected with the upper sampling port of the pressure vessel (1) through pipeline two (6) provided with valve two (7), and pipeline two (6) and the upper sampling port of the pressure vessel (1) are at the same horizontal height, and the bottom of the isolation tank (3) is connected with the negative pressure chamber of the differential pressure transmitter (2) through pipeline three (8); further comprising a communication pipe (9) and a liquid discharge pipe one (10), the communication pipe (9) connects pipeline one (4) and pipeline two (6), the connection between the communication pipe (9) and pipeline one (4) is between valve one (5) and the differential pressure transmitter (2), and is at the same horizontal height with the lower sampling port of the pressure vessel (1), the connection between the communication pipe (9) and pipeline two (6) is between valve two (7) and the isolation tank (3), one end of the liquid discharge pipe one (10) is connected with pipeline three (8), the connection is between the isolation tank (3) and the differential pressure transmitter (2) on pipeline three (8), and is at the same horizontal height with the negative pressure chamber of the differential pressure transmitter (2), and valve three (11) is arranged on the liquid discharge pipe one (10). further comprising a liquid discharge pipe two (12), one end of the liquid discharge pipe two (12) is connected with pipeline one (4), the connection is between valve one (5) and the differential pressure transmitter (2) on pipeline one (4), and is at the same horizontal height with the lower sampling port of the pressure vessel (1), and valve four (13) is arranged on the liquid discharge pipe two (12).

2. The pressure vessel liquid level monitoring apparatus of claim 1, wherein, the communication pipe (9), the liquid discharge pipe two (12) and pipeline one (4) are connected through a four-way joint (14).

3. The pressure vessel liquid level monitoring apparatus of claim 2, wherein, the communication pipe (9) and pipeline two (6) are connected through a three-way joint one (15), and the liquid discharge pipe one (10) and pipeline three (8) are connected through a three-way joint two (16).

4. A pressure vessel level monitoring apparatus as claimed in any one of claims 1 to 3, wherein, valve one (5), valve two (7), valve three (11) and valve four (13) are all manual valves.

5. A pressure vessel liquid level monitoring apparatus as claimed in claim 2 or 3, wherein, valve one (5) and valve two (7) are ball valves.

6. The pressure vessel liquid level monitoring apparatus of claim 5, wherein, valve three (11) and valve four (13) are needle valves.

7. The pressure vessel liquid level monitoring apparatus of claim 5, wherein, valve one (5), valve two (7), valve three (11) and valve four (13) are any one of pneumatic valves, solenoid valves and electric valves.

8. A pressure vessel liquid level monitoring apparatus as claimed in claim 2 or 3, characterised in that, a throttling module (17) is arranged on the outlet side of valve three (11) on the liquid discharge pipe one (10) and on the outlet side of valve four (13) on the liquid discharge pipe two (12).

9. The pressure vessel liquid level monitoring apparatus of claim 8, wherein, a pressure vessel liquid level monitoring device as claimed in any one of claims 1-9 is arranged.

10. An apparatus for producing hydrogen by electrolysis of water, characterized by ​

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