A plunger pump outlet exhaust device and a triethylene glycol circulation system

Abstract

This utility model relates to the field of natural gas dehydration technology, specifically to a plunger pump outlet venting device and a triethylene glycol (TED) circulation system. The venting device includes an vent pipe and a collection tank. The vent pipe connects to the top of the TED delivery pipe and is equipped with a first valve. The vent pipe extends into the collection tank. This utility model, by adding a vent pipe to the plunger pump's outlet pipeline, removes the gas accumulated inside the plunger pump, thereby enabling the plunger pump to quickly enter normal operating condition, reducing pump and pipeline vibration, and improving process stability and equipment safety.

Description

Technical Field

[0001] This utility model relates to the field of natural gas dehydration technology, and in particular to a plunger pump outlet exhaust device and a triethylene glycol circulation system. Background Technology

[0002] The combined unit's feedstock natural gas has an extremely high water content and must undergo dehydration treatment to lower the water dew point of the natural gas to 5 degrees Celsius below the local ambient temperature. This requires a high-pressure pump to deliver the dehydration solvent (triethylene glycol).

[0003] Plunger pumps are characterized by high delivery density, low flow rate, and high head, making them suitable for the cyclic delivery of triethylene glycol. However, during use, it was found that in the initial stage of starting the plunger pump, the presence of gas in the cylinder caused the pump to fail to deliver a sufficient volume, resulting in vibration of the pump body and pipelines. This affected the stability of the process and the safety of the equipment, as well as the delivery efficiency of triethylene glycol.

[0004] Therefore, a technical solution is needed to address the problem of insufficient pump output and pump body and pipeline vibration caused by gas accumulation in the cylinder during the initial startup of a plunger pump used for triethylene glycol circulation. Utility Model Content

[0005] The purpose of this invention is to overcome the technical problem that when a plunger pump is used for triethylene glycol circulation, gas accumulates in the cylinder during the initial start-up of the plunger pump, resulting in insufficient pump output and vibration of the pump body and pipeline. This invention provides a plunger pump outlet exhaust device and a triethylene glycol circulation system.

[0006] In a first aspect, the present invention provides a plunger pump outlet exhaust device, comprising an exhaust pipe and a collection tank, wherein the exhaust pipe is used to connect to the top of a triethylene glycol delivery pipe, a first valve is provided on the exhaust pipe, and the exhaust pipe extends into the collection tank.

[0007] This utility model discloses a plunger pump outlet exhaust device. In use, the exhaust pipe is connected to the delivery pipe in the triethylene glycol circulation system. In the initial stage of plunger pump operation, the gas in the delivery pipe is located at the top of the delivery pipe. Therefore, connecting the exhaust pipe to the top of the delivery pipe can better exhaust the gas in the delivery pipe and reduce the discharge of triethylene glycol. The gas and liquid are transported to the collection tank through the exhaust pipe. While exhausting the gas from the plunger pump, the triethylene glycol discharged with the gas is collected, avoiding waste of triethylene glycol and environmental pollution.

[0008] Preferably, the exhaust pipe includes a rigid pipe section and a flexible pipe section that are interconnected, the first valve is disposed on the flexible pipe section, the rigid pipe section is used to connect to the triethylene glycol delivery pipe, and the flexible pipe section extends into the collection tank.

[0009] The exhaust pipe is divided into a rigid section and a flexible section. The rigid section ensures a stable connection between the exhaust pipe and the triethylene glycol delivery pipe, while the flexible section is easy to operate and facilitates the smooth delivery of gas and liquid to the collection tank in narrow environments, with less impact from on-site pipelines.

[0010] Preferably, the first valve is a plug valve.

[0011] The plug valve features rapid opening and closing, low pressure drop, and corrosion resistance. Installing a plug valve on the flexible section of the exhaust pipe facilitates precise control of the exhaust volume, thereby preventing a large amount of triethylene glycol from being discharged.

[0012] Preferably, the hose section is further provided with a second valve, which is a ball valve, and the second valve and the first valve are arranged sequentially along the flow direction of the medium in the hose section.

[0013] Because of the high pressure of the medium inside the exhaust pipe, the hose section is shut off simultaneously by a ball valve and a plug valve at the end of the exhaust process to reduce the risk of triethylene glycol leakage and improve the safety of the exhaust process.

[0014] Preferably, a third valve is provided on the rigid pipe section, and the third valve is a manual gate valve.

[0015] When exhaust is not required, the exhaust pipe can be shut off via the third valve. The manual gate valve on the rigid pipe section provides a stable shut-off function for the exhaust pipe, ensuring better sealing for the triethylene glycol circulation process.

[0016] Preferably, the exhaust pipe (1) is provided with a pressure measuring tube, and the pressure measuring tube is provided with a pressure gauge.

[0017] The pressure of the medium in the exhaust pipe is monitored in real time by a pressure gauge. When the pressure gauge reading fluctuates significantly, it indicates that gas is still being discharged through the exhaust pipe. At this time, the liquid can continue to be discharged. When the pressure gauge reading stabilizes, it indicates that the gas has been completely discharged and the first valve can be closed to avoid the accidental discharge of a large amount of triethylene glycol.

[0018] Preferably, the pressure measuring tube is provided with a fourth valve, which is a manual gate valve.

[0019] When the pressure gauge needs maintenance or replacement, the fourth valve can be closed to prevent triethylene glycol leakage during the maintenance and replacement process.

[0020] Preferably, the top of the collection bucket is detachably covered, and the cover has a through hole for installing the hose section.

[0021] By installing a cap on the top of the collection tank, it is possible to prevent triethylene glycol from splashing out of the tank, causing environmental pollution and waste. In addition, the through hole on the cap can limit the hose section of the exhaust pipe, making it less likely for the hose section to detach from the collection tank.

[0022] Preferably, the cover is provided with a vent hole.

[0023] This allows the gas entering the collection tank to be discharged through the vent, ensuring normal gas flow in the exhaust pipe.

[0024] In a second aspect, the present invention provides a triethylene glycol circulation system, including a plunger pump, the plunger pump being connected to an inlet pipe and an outlet pipe, the outlet pipe being provided with a plunger pump outlet venting device as described above, and the venting pipe being connected to the top of the outlet pipe.

[0025] This utility model discloses a triethylene glycol circulation system. When the plunger pump is started, the gas inside the plunger pump enters the exhaust pipe through the gas at the top of the outlet pipe, and then enters the collection tank. This exhausts the plunger pump during the initial start-up phase and collects the triethylene glycol carried out during the exhaust process, thus avoiding the problems of insufficient pump output and pump body and pipeline vibration during the initial start-up phase of the plunger pump.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] 1. The present invention provides a plunger pump outlet exhaust device, which, by adding an exhaust pipe to the plunger pump outlet pipeline, leads out the gas accumulated in the plunger pump, thereby enabling the plunger pump to quickly enter the normal working state, reducing the vibration of the pump body and pipeline, and improving process stability and equipment safety.

[0028] 2. The present invention provides a plunger pump outlet exhaust device, which connects the exhaust pipe to the top of the plunger pump outlet pipe, making it easier for gas to be discharged and reducing the discharge of triethylene glycol. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a plunger pump outlet exhaust device;

[0030] Figure 2 This is a schematic diagram of the structure of the collection bucket described in this utility model;

[0031] Figure 3 This is a schematic diagram of the structure of a triethylene glycol circulation system according to this utility model;

[0032] Marked in the image:

[0033] 1-Exhaust pipe, 11-Hard pipe section, 12-Hose section, 2-Collection bucket, 211-Through hole, 212-Exhaust hole, 3-First valve, 4-Second valve, 5-Third valve, 6-Pressure measuring pipe, 7-Pressure gauge, 8-Fourth valve, 9-Plunger pump, 91-Inlet pipe, 92-Outlet pipe. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0035] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0036] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0037] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0038] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0039] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0040] Example 1

[0041] like Figure 1 and Figure 3 As shown, a plunger pump outlet exhaust device includes an exhaust pipe 1 and a collection tank 2. The exhaust pipe 1 is connected to the top of a triethylene glycol delivery pipe via a flange. A first valve 3 is provided on the exhaust pipe 1. The first valve 3 is a plug valve. The exhaust pipe 1 extends into the collection tank 2.

[0042] In use, the exhaust pipe 1 is connected to the delivery pipe in the triethylene glycol circulation system. In the initial stage of operation of the plunger pump 9, the gas in the delivery pipe is located at the top of the delivery pipe. Therefore, connecting the exhaust pipe 1 to the top of the delivery pipe can better discharge the gas in the delivery pipe and reduce the discharge of triethylene glycol. The gas and liquid are transported to the collection tank 2 through the exhaust pipe 1. While discharging the gas from the plunger pump 9, the triethylene glycol discharged with the gas is collected to avoid waste of triethylene glycol and environmental pollution.

[0043] Exhaust pipe 1: Exhaust pipe 1 is divided into a rigid pipe section 11 and a flexible pipe section 12. The rigid pipe section 11 is equipped with a third valve 5, which is a manual gate valve. The rigid pipe section 11 ensures a stable connection between the exhaust pipe 1 and the triethylene glycol delivery pipe. The flexible pipe section 12 is easy to operate and facilitates the smooth flow of gas and liquid to the collection tank 2 in narrow environments, with less influence from on-site pipelines. The flexible pipe section 12 is also equipped with a second valve 4, which is a ball valve. The second valve 4 and the first valve 3 are arranged sequentially along the flow direction of the medium in the flexible pipe section 12. At the end of the exhaust process, the flexible pipe section 12 is shut off simultaneously by the ball valve and the plug valve to reduce the risk of triethylene glycol leakage and improve the safety of the exhaust process.

[0044] Example 2

[0045] like Figure 1As shown, in this embodiment, the difference from embodiment 1 is that the exhaust pipe 1 is provided with a pressure measuring pipe 6, specifically set at the connection between the rigid pipe section 11 and the flexible pipe section 12, and the rigid pipe section 11, the flexible pipe section 12 and the pressure measuring pipe 6 are connected by a tee respectively, and the pressure measuring pipe 6 is provided with a pressure gauge 7.

[0046] In this embodiment, the pressure of the medium in the exhaust pipe 1 is monitored in real time by pressure gauge 7. When the value of pressure gauge 7 fluctuates greatly, it indicates that gas is still being discharged through exhaust pipe 1. At this time, liquid can continue to be discharged. When the value of pressure gauge 7 tends to stabilize, it indicates that the gas has been completely discharged and the first valve 3 can be closed to avoid a large amount of triethylene glycol being accidentally discharged.

[0047] Furthermore, a fourth valve 8 is provided on the pressure measuring tube 6. The fourth valve 8 is a manual gate valve. When the pressure gauge 7 needs to be maintained or replaced, the fourth valve 8 can be closed to prevent triethylene glycol from leaking out during the maintenance and replacement of the pressure gauge 7.

[0048] Example 3

[0049] like Figure 1 and Figure 2 As shown, in this embodiment, the difference from embodiment 1 is that the top of the collection bucket 2 is detachably covered, and the cover is provided with a through hole 211 for installing the hose section 12.

[0050] In this embodiment, by setting a cap on the top of the collection tank 2, the triethylene glycol that enters the contact tank can be prevented from splashing out of the tank, causing environmental pollution and waste of triethylene glycol. In addition, the through hole 211 on the cap can limit the hose section 12 of the exhaust pipe 1, making it difficult for the hose section 12 to detach from the collection tank 2.

[0051] Furthermore, the cover is provided with an exhaust hole 212, which allows the gas entering the collection bucket 2 to be discharged through the exhaust hole 212, ensuring normal gas flow in the exhaust pipe 1.

[0052] Example 4

[0053] like Figure 1 and Figure 3 As shown, this embodiment provides a triethylene glycol circulation system, including a plunger pump 9. The plunger pump 9 is connected to an inlet pipe 91 and an outlet pipe 92. The outlet pipe 92 is provided with a plunger pump outlet exhaust device as described in any of Embodiments 1-3. The exhaust pipe 1 is connected to the top of the outlet pipe 92 (i.e., the upper area of ​​the outlet pipe 92 when it is laid horizontally) through a flange.

[0054] When the plunger pump 9 is started, the gas inside the plunger pump 9 enters the exhaust pipe 1 through the gas at the top of the outlet pipe 92, and then enters the collection tank 2, thereby venting the plunger pump 9 at the initial stage of start-up. At the same time, the triethylene glycol carried out during the venting process is collected, avoiding the problems of insufficient pump output and pump body and pipeline vibration at the initial stage of plunger pump 9 start-up.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A plunger pump outlet exhaust device, characterized in that, It includes an exhaust pipe (1) and a collection bucket (2). The exhaust pipe (1) is used to connect to the top of the triethylene glycol delivery pipe. A first valve (3) is provided on the exhaust pipe (1). The exhaust pipe (1) extends into the collection bucket (2).

2. A plunger pump outlet venting device according to claim 1, wherein, The exhaust pipe (1) includes a rigid pipe section (11) and a flexible pipe section (12) that are connected to each other. The first valve (3) is disposed on the flexible pipe section (12). The rigid pipe section (11) is used to connect the triethylene glycol delivery pipe. The flexible pipe section (12) extends into the collection tank (2).

3. A plunger pump outlet de-aeration device according to claim 2, wherein, The first valve (3) is a plug valve.

4. A plunger pump outlet de-aeration device according to claim 3, wherein, The hose section (12) is also provided with a second valve (4), which is a ball valve. The second valve (4) and the first valve (3) are arranged sequentially along the flow direction of the medium in the hose section (12).

5. A plunger pump outlet venting device according to claim 2, wherein, The rigid pipe section (11) is provided with a third valve (5), which is a manual gate valve.

6. A plunger pump outlet venting device according to claim 2, wherein, The exhaust pipe (1) is equipped with a pressure measuring tube (6), and the pressure measuring tube (6) is equipped with a pressure gauge (7).

7. A plunger pump outlet venting device according to claim 6, wherein, The pressure measuring tube (6) is equipped with a fourth valve (8), which is a manual gate valve.

8. A plunger pump outlet de-aeration device according to any one of claims 2 to 7, wherein, The top of the collection bucket (2) is detachably covered, and the cover is provided with a through hole (211) for installing the hose section (12).

9. A plunger pump outlet venting device according to claim 8, wherein, The cover is provided with an exhaust port (212).

10. A triethylene glycol circulating system comprising a plunger pump (9) connected with a liquid inlet pipe (91) and a liquid outlet pipe (92), characterized in that The outlet pipe (92) is provided with a plunger pump outlet exhaust device as described in any one of claims 1-9, and the exhaust pipe (1) is connected to the top of the outlet pipe (92).

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