Triethylene glycol heat exchange device and circulating system thereof

Abstract

The utility model relates to the field of heat exchanger, concretely relates to a triethylene glycol heat exchange device and circulating system thereof, wherein the heat exchange device includes heat exchanger and conveying pipe, the conveying pipe communicates with heat exchanger, be provided with stirring mechanism on the conveying pipe. The utility model adds the stirring mechanism before the heat exchanger, and the stirring mechanism stirs triethylene glycol lean liquid and rich liquid before entering the heat exchanger, can reduce grease and impurity accumulation in the bottom of pipeline, thereby reducing the heat exchanger blockage problem.

Description

Technical Field

[0001] This utility model relates to the field of heat exchangers, and in particular to a triethylene glycol heat exchange device and its circulation system. Background Technology

[0002] Currently, natural gas extracted from shale gas needs to undergo multi-stage separation and dehydration. The triethylene glycol (TED) dehydration skid is the final step in this process, ensuring that high-quality, dry natural gas is transported downstream. During dehydration, the natural gas containing moisture comes into full contact with lean TED solution in an absorption tower, allowing the moisture in the gas to be adsorbed into the lean TED solution, thus achieving dehydration. After adsorbing moisture, the lean solution becomes rich solution. To achieve the goal of TED recycling, the rich TED solution needs to be dehydrated and regenerated. During the recycling process, the lean and rich solutions need to exchange heat through a plate heat exchanger to maintain process stability.

[0003] In practical applications, water molecules and various auxiliary extraction chemical liquids mix in the natural gas pipeline. After passing through the absorption tower and coming into contact with the lean triethylene glycol solution for dehydration, the solution undergoes regeneration and circulation. During regeneration, the rich solution enters the reboiler, where water molecules evaporate before entering the plate heat exchanger for heat exchange, and is then pumped into the absorption tower via a plunger pump. Over time, the triethylene glycol becomes severely contaminated. Grease and impurities deposited below the pipeline mix together, causing frequent blockages in the plate heat exchanger. This necessitates shutting down the triethylene glycol dehydration skid for cleaning and maintenance of the plate heat exchanger, increasing production costs.

[0004] Therefore, a technical solution is needed to address the problem that when triethylene glycol-rich or lean liquids enter the heat exchanger, grease and impurities tend to accumulate at the bottom of the pipes, causing blockages. Utility Model Content

[0005] The purpose of this invention is to overcome the technical problem that when triethylene glycol lean or rich solutions enter the heat exchanger, the accumulation of grease and impurities at the bottom of the pipes can easily cause blockage of the heat exchanger. This invention provides a triethylene glycol heat exchange device and its circulation system.

[0006] In a first aspect, the present invention provides a triethylene glycol heat exchange device, comprising a heat exchanger and a conveying pipe, wherein the conveying pipe is connected to the heat exchanger and a stirring mechanism is provided on the conveying pipe.

[0007] This utility model discloses a triethylene glycol heat exchange device. In use, the device is placed between the absorption tower and the reboiler. Liquid containing grease and impurities enters the stirring mechanism through the conveying pipe. The stirring mechanism stirs the liquid, reducing the heat exchanger blockage caused by the large accumulation of grease and impurities at the bottom of the pipe.

[0008] Preferably, the stirring mechanism includes a cylinder, a stirring shaft is disposed inside the cylinder, a first stirring assembly is disposed on the stirring shaft, the first stirring assembly includes a plurality of stirring blades, the plurality of stirring blades being arranged around the stirring shaft.

[0009] Under the action of external power, the stirring shaft is driven to rotate, thereby driving the stirring blades to stir the liquid and the oil and impurities in the liquid.

[0010] Preferably, the axis of the cylinder is arranged along the liquid flow direction, the stirring shaft is arranged along the axis of the cylinder, and a plurality of stirring blades are spirally arranged around the stirring shaft.

[0011] The spiral type refers to each stirring blade being at an angle to the axis of the stirring shaft, so that the liquid flows and pushes against the stirring blade. Multiple stirring blades are subjected to force and rotate, thus stirring the liquid entering the cylinder without the need for external power.

[0012] Preferably, a second stirring component is provided on the stirring shaft, and the second stirring component is located downstream of the first stirring component along the liquid flow direction.

[0013] The stirring shaft can rotate under the drive of the first stirring component. A second stirring component is added to the stirring shaft, which rotates under the drive of the stirring shaft. This can further stir the liquid entering the cylinder and reduce the accumulation of grease and impurities at the bottom of the pipe.

[0014] Preferably, the second stirring assembly includes a plurality of stirring blades, which are inclined to the axis of the stirring shaft.

[0015] Setting the agitator at an angle relative to the axis of the agitator shaft can reduce the agitator's resistance to liquid flow, allowing the liquid to maintain a high flow rate. This high flow rate reduces the deposition of grease and impurities at the bottom of the pipe.

[0016] Preferably, all the stirring paddles are arranged in parallel to each other.

[0017] By arranging all the agitators in parallel, the interference of the second agitator on the liquid flow can be reduced, and the rotation of the agitator itself can stir up the grease and impurities flowing at the bottom.

[0018] Preferably, the conveying pipe is provided with a first valve and a second valve, which are located on both sides of the stirring mechanism.

[0019] When the mixing mechanism becomes clogged, the first and second valves can be closed to facilitate the inspection and maintenance of the mixing mechanism located between the first and second valves.

[0020] Preferably, it also includes a bypass pipe, the two ends of which are respectively connected to both sides of the stirring mechanism, and a third valve is provided on the bypass pipe.

[0021] The first and second valves are located within the bypass pipe's span. When the agitator becomes blocked, the first and second valves are closed, while the third valve on the bypass pipe is opened to continue supplying liquid to the heat exchanger through the bypass pipe, thus avoiding downtime caused by maintenance of the agitator.

[0022] On the other hand, the present invention also provides a triethylene glycol circulation system, including an absorption tower and a reboiler, wherein a rich liquid pipe and a lean liquid pipe are connected between the absorption tower and the reboiler, and a triethylene glycol heat exchange device as described above is provided on the lean liquid pipe.

[0023] This utility model discloses a triethylene glycol circulation system. In use, the liquid is regenerated by a reboiler and then enters a lean liquid pipe. It then enters a stirring mechanism through a delivery pipe. The stirring mechanism stirs the liquid to reduce the heat exchanger blockage caused by the large accumulation of grease and impurities at the bottom of the pipe.

[0024] On the other hand, the present invention also provides a triethylene glycol circulation system, including an absorption tower and a reboiler, wherein a rich liquid pipe and a lean liquid pipe are connected between the absorption tower and the reboiler, and a triethylene glycol heat exchange device as described above is provided on the rich liquid pipe.

[0025] By installing a triethylene glycol heat exchanger as described above on the rich liquid pipe, the liquid can be stirred in advance by a stirring mechanism before each of the two heat exchange processes in the triethylene glycol circulation process, thereby reducing the problem of heat exchanger blockage during the entire triethylene glycol circulation process.

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

[0027] This utility model provides a triethylene glycol heat exchange device. By adding a stirring mechanism before the heat exchanger, the stirring mechanism stirs the triethylene glycol lean and rich liquid before it enters the heat exchanger, which can reduce the accumulation of grease and impurities at the bottom of the pipe, thereby reducing the problem of heat exchanger blockage. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a triethylene glycol heat exchanger according to Embodiment 1 of this utility model;

[0029] Figure 2 This is a schematic diagram showing the connection relationship between the rotating shaft and the first stirring assembly described in this utility model;

[0030] Figure 3 This is a schematic diagram of the structure of a triethylene glycol heat exchanger according to Embodiment 2 of this utility model;

[0031] Figure 4 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-Heat exchanger, 2-Transfer pipe, 3-Stirring mechanism, 31-Cylinder, 32-Rotating shaft, 33-First stirring assembly, 331-Stirring blade, 34-Second stirring assembly, 341-Stirring paddle, 4-First valve, 5-Second valve, 6-Bypass pipe, 7-Third valve, 8-Absorber, 9-Reboiler, 10-Rich liquid pipe, 11-Lean liquid pipe, 12-Plunger pump. 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 2 As shown, a triethylene glycol heat exchange device includes a heat exchanger 1 and a delivery pipe 2, wherein the delivery pipe 2 is connected to the heat exchanger 1 and a stirring mechanism 3 is provided on the delivery pipe 2.

[0042] In use, this device is placed between the absorption tower and the reboiler. Liquid containing grease and impurities enters the stirring mechanism 3 through the conveying pipe 2. The stirring mechanism 3 stirs the liquid to reduce the problem of heat exchanger 1 being blocked due to the large accumulation of grease and impurities at the bottom of the pipe.

[0043] The stirring mechanism 3 includes a cylinder 31, which is vertically arranged so that the axis of the cylinder 31 is perpendicular to the ground, making it easier for grease and impurities to be stirred evenly. A stirring shaft is provided inside the cylinder 31, and a first stirring component 33 is provided on the stirring shaft. The first stirring component 33 includes a plurality of stirring blades 331, which are arranged around the stirring shaft. Under the action of an external power, the stirring shaft is driven to rotate, thereby driving the stirring blades 331 to stir the liquid and the grease and impurities in the liquid.

[0044] Furthermore, the axis of the cylinder 31 is arranged along the liquid flow direction, the stirring shaft 32 is arranged along the axis of the cylinder 31, and a plurality of stirring blades 331 are spirally arranged around the stirring shaft 32. The spiral arrangement means that each stirring blade 331 is at an angle to the axis of the stirring shaft, so that the liquid flows and pushes the stirring blades 331. The multiple stirring blades 331 rotate under the force, thereby stirring the liquid entering the cylinder 31 without the need for external power.

[0045] Furthermore, a second stirring component 34 is provided on the stirring shaft. The second stirring component 34 is located downstream of the first stirring component 33 along the liquid flow direction. The stirring shaft can rotate under the drive of the first stirring component 33. The addition of the second stirring component 34 to the stirring shaft, which rotates under the drive of the stirring shaft, can further stir the liquid entering the cylinder 31, reducing the accumulation of grease and impurities at the bottom of the pipe. The second stirring component 34 includes several stirring paddles 341, which are inclined to the axis of the stirring shaft. All the stirring paddles 341 are arranged parallel to each other, which can reduce the interference of the second stirring component 34 on the liquid flow. The second stirring component 34 stirs the grease and impurities flowing at the bottom through its own rotation.

[0046] Example 2

[0047] like Figure 3 As shown, in this embodiment, the difference from embodiment 1 is that the conveying pipe 2 is provided with a first valve 4 and a second valve 5, and the first valve 4 and the second valve 5 are arranged on both sides of the stirring mechanism 3.

[0048] In this embodiment, when the stirring mechanism 3 becomes blocked, the first valve 4 and the second valve 5 can be closed to facilitate the inspection and maintenance of the stirring mechanism 3 located between the first valve 4 and the second valve 5.

[0049] Furthermore, it also includes a bypass pipe 6, with both ends of the bypass pipe 6 connected to both sides of the stirring mechanism 3. The bypass pipe 6 is equipped with a third valve 7, and the first valve 4 and the second valve 5 are located within the range spanned by the bypass pipe 6. When the stirring mechanism 3 is blocked, the first valve 4 and the second valve 5 are closed, and the third valve 7 on the bypass pipe 6 is opened at the same time, so that liquid can continue to be supplied to the heat exchanger 1 through the bypass pipe 6, thus avoiding downtime caused by the maintenance of the stirring mechanism 3.

[0050] Example 3

[0051] As shown in the figure, in this embodiment, a triethylene glycol circulation system is provided, including an absorption tower 8 and a reboiler 9. A rich liquid pipe 10 and a lean liquid pipe 11 are connected between the absorption tower 8 and the reboiler 9. A triethylene glycol heat exchange device as described in Embodiment 1 or Embodiment 2 is provided on the lean liquid pipe 11.

[0052] During use, the liquid is regenerated by the reboiler 9 and then enters the lean liquid pipe 11 under the action of the plunger pump 12. It then enters the stirring mechanism 3 through the delivery pipe 2. The stirring mechanism 3 stirs the liquid to reduce the problem of heat exchanger 1 being blocked due to the large accumulation of grease and impurities at the bottom of the pipe.

[0053] Furthermore, the rich liquid pipe 10 is equipped with a triethylene glycol heat exchange device as described in Example 1 or Example 2, so that the liquid can be stirred in advance by the stirring mechanism 3 before each heat exchange in the triethylene glycol circulation process, thereby reducing the problem of heat exchanger 1 clogging in the entire triethylene glycol circulation process.

[0054] 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 triethylene glycol heat exchanger, characterized in that, It includes a heat exchanger (1) and a conveying pipe (2), the conveying pipe (2) being connected to the heat exchanger (1), and a stirring mechanism (3) being provided on the conveying pipe (2).

2. The triethylene glycol heat exchanger according to claim 1, characterized in that, The stirring mechanism (3) includes a cylinder (31), a stirring shaft is provided inside the cylinder (31), and a first stirring component (33) is provided on the stirring shaft. The first stirring component (33) includes a plurality of stirring blades (331), which are arranged around the stirring shaft.

3. The triethylene glycol heat exchanger according to claim 1, characterized in that, The axis of the cylinder (31) is arranged along the liquid flow direction, the stirring shaft is arranged along the axis of the cylinder (31), and a plurality of stirring blades (331) are spirally arranged around the stirring shaft.

4. The triethylene glycol heat exchanger according to claim 1, characterized in that, A second stirring component (34) is provided on the stirring shaft, and the second stirring component (34) is located downstream of the first stirring component (33) along the liquid flow direction.

5. A triethylene glycol heat exchanger according to claim 1, characterized in that, The second stirring assembly (34) includes a plurality of stirring paddles (341), which are inclined to the stirring shaft axis.

6. A triethylene glycol heat exchanger according to claim 1, characterized in that, All the aforementioned stirring paddles (341) are arranged in parallel to each other.

7. A triethylene glycol heat exchanger according to claim 1, characterized in that, The conveying pipe (2) is provided with a first valve (4) and a second valve (5), which are located on both sides of the stirring mechanism (3).

8. A triethylene glycol heat exchanger according to claim 1, characterized in that, It also includes a bypass pipe (6), the two ends of which are connected to the two sides of the stirring mechanism (3), and a third valve (7) is provided on the bypass pipe (6).

9. A triethylene glycol circulation system, comprising an absorber (8) and a reboiler (9), wherein a rich liquid pipe (10) and a lean liquid pipe (11) are connected between the absorber (8) and the reboiler (9), characterized in that, The lean liquid pipe (11) is provided with a triethylene glycol heat exchange device as described in any one of claims 1-8.

10. A triethylene glycol circulation system, comprising an absorber (8) and a reboiler (9), wherein a rich liquid pipe (10) and a lean liquid pipe (11) are connected between the absorber (8) and the reboiler (9), characterized in that, The rich liquid pipe (10) is provided with a triethylene glycol heat exchange device as described in any one of claims 1-8.

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