Outer pipe gallery PX pipeline heat tracing facility

Abstract

The utility model provides an outer pipe gallery PX pipeline heat tracing facility, and relates to the field of petrochemical engineering technology renovation, the outer pipe gallery PX pipeline heat tracing facility comprises a heat tracing pipeline laid close to a PX pipeline, the heat tracing pipeline comprises a first pipeline, a second pipeline, a third pipeline and a fourth pipeline, the first pipeline is communicated with the second pipeline, the second pipeline is communicated with the third pipeline, and the fourth pipeline is communicated with the third pipeline. And the third pipeline is communicated with the fourth pipeline. According to the utility model, the problems that the public outer pipe gallery has no steam heat tracing gas source and conventional electric heat tracing cannot be installed are solved, the problem of high cost for installing long power transmission heat tracing is avoided, heat tracing of a PX pipeline is realized through part of existing processes and systems, freezing of the pipeline in winter is also avoided, and the production safety is improved; and meanwhile, heat tracing condensate returns to a factory condensate system again through circulation, and waste is avoided.

Description

Technical Field

[0001] The utility model relates to the field of petrochemical process transformation, in particular to a PX pipeline heating facility for an external pipe gallery. Background Art

[0002] The PX pipeline is used to transport PX raw materials from CNOOC Huizhou Petrochemical to our tank area.

[0003] The PX pipeline in the outer pipe gallery needs to be equipped with a heating system. Since the outer pipe gallery is a public pipe gallery and has no steam source, steam heating cannot be installed normally. If electric heating is installed, according to the management of the public pipe gallery and actual conditions, it cannot meet the requirements of cable wiring and control box installation. Only long-distance electric heating can be installed, but the cost is high and maintenance is inconvenient

[0004] In order to realize the pipeline heating function and save costs at the same time, after workshop experiments and trial production, the existing recycled low-pressure condensate is used to circulate through a condensate pump to realize the pipeline heating function and save finished products at the same time. Utility Model Content

[0005] The utility model provides a PX pipeline heating facility in an external pipe gallery, which solves the problem that the actual situation of the existing external pipe gallery cannot meet the PX pipeline heating requirements and thus affects pipeline transportation and production.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A PX pipeline heating facility in an external pipe gallery includes a heating pipeline laid close to the PX pipeline, the heating pipeline includes a first pipeline, a second pipeline, a third pipeline and a fourth pipeline, the first pipeline is connected to the second pipeline, the second pipeline is connected to the third pipeline, and the third pipeline is connected to the fourth pipeline.

[0008] Furthermore, the first pipeline is connected to a condensate pump outlet pipeline.

[0009] Furthermore, a first valve is arranged on the first pipeline.

[0010] Furthermore, the fourth pipeline is connected to the condensate tank inlet pipeline.

[0011] Furthermore, a second valve is provided on the fourth pipeline.

[0012] Furthermore, the second pipeline and the third pipeline are respectively closely attached to the upper surface and the lower surface of the PX pipeline.

[0013] Furthermore, one end of the PX pipeline is connected to the PX tank area, and the other end of the PX pipeline is connected to CNOOC; two thermometers are arranged on the PX pipeline, one of the thermometers is arranged on the PX pipeline close to the PX tank area, and the other of the thermometer is arranged on the PX pipeline close to CNOOC.

[0014] The beneficial effects of the utility model are:

[0015] The utility model solves the problem that there is no steam heating gas source in the public external pipe gallery and conventional electric heating cannot be installed, avoids the cost problem of high cost of installing long-distance power transmission heating, realizes the heating of PX pipeline through some existing processes and systems, and also avoids freezing of pipelines in winter, thereby improving production safety; at the same time, the condensate produced by heating is returned to the condensate system of the factory through circulation, thus avoiding waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the facility transformation of the utility model.

[0018] Description of Figure Numbers:

[0019] 1. PX tank area; 2. CNOOC; 3. PX pipeline; 4. First pipeline; 5. Second pipeline; 6. Third pipeline; 7. Fourth pipeline; 8. First valve; 9. Second valve; 10. Condensate pump; 11. Condensate tank. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the utility model. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0024] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present utility model: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0025] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0026] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0027] The utility model provides a technical solution: a PX pipeline heating facility in an external pipe gallery, such as Figure 1 As shown, it includes a heating pipeline laid close to the PX pipeline 3, and the heating pipeline includes a first pipeline 4, a second pipeline 5, a third pipeline 6 and a fourth pipeline 7. The first pipeline 4 is connected to the second pipeline 5, the second pipeline 5 is connected to the third pipeline 6, and the third pipeline 6 is connected to the fourth pipeline 7; the first pipeline 4 is connected to the outlet pipeline of the condensate pump 10, and the fourth pipeline 7 is connected to the inlet pipeline of the condensate tank 11.

[0028] The first pipeline 4 is connected to the outlet pipeline of the condensate pump 10 , and a second valve 9 is provided on the fourth pipeline 7 .

[0029] One end of the PX pipeline 3 is connected to the PX tank area 1, and the other end of the PX pipeline 3 is connected to CNOOC 2; two thermometers are arranged on the PX pipeline 3, one of the thermometers is arranged on the PX pipeline 3 close to the PX tank area 1, and the other of the thermometer is arranged on the PX pipeline 3 close to CNOOC 2.

[0030] The working process of this facility is:

[0031] 1. Open all valves on the heating pipeline, the first valve 8 and the second valve 9, to form an effective loop for the heating pipeline;

[0032] 2. The low-pressure condensate of the whole plant is collected through the pipeline network and enters the F-7191 condensate tank 11. The recovered condensate is transported to the second pipeline 5 and the third pipeline 6 through the newly added first pipeline 4 at the outlet of the condensate pump 10 by the condensate pump 10G-7192A / B to the external pipeline corridor for heating the PX pipeline 3, and then returns to the condensate tank 11 from the fourth pipeline 7.

[0033] After the condensate from the whole plant is collected through the pipeline network, it enters the F-7191 condensate tank 11. The condensate temperature is generally between 85 and 95 degrees Celsius, and water heating is achieved by condensate circulation.

[0034] The total length of the heating pipeline is about 4300 meters, and the flow rate of G-7192A / B is 70m 3 / h, with a head of 90 meters, which meets the needs of circulating heating.

[0035] 3. Install two thermometers on the public external pipe gallery PX pipeline 3, one near PX tank area 1 and one near CNOOC 2. Daily inspections can be conducted to understand the actual heating situation by observing the temperature.

[0036] The condensate temperature of the condensate system is between 85 and 95 degrees Celsius. Through the transformation to achieve circulating heating, the temperature of the PX pipeline can be maintained at 35 to 45 degrees Celsius. The condensation point of the PX material is 13.3 degrees Celsius, which meets the requirements of use.

[0037] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the technical solution and inventive concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An external pipe gallery PX pipeline heating facility, characterized in that: The invention comprises a heat tracing pipeline laid close to a PX pipeline (3), wherein the heat tracing pipeline comprises a first pipeline (4), a second pipeline (5), a third pipeline (6) and a fourth pipeline (7), wherein the first pipeline (4) is in communication with the second pipeline (5), and the first pipeline (4) is connected to an outlet pipeline of a condensate pump (10); a first valve (8) is provided on the first pipeline (4); the second pipeline (5) is in communication with the third pipeline (6), and the third pipeline (6) is in communication with the fourth pipeline (7); and the fourth pipeline (7) is connected to an inlet pipeline of a condensate tank (11); One end of the PX pipeline (3) is connected to the PX tank area (1), and the other end of the PX pipeline (3) is connected to CNOOC (2); two thermometers are arranged on the PX pipeline (3), one of the thermometers is arranged on the PX pipeline (3) close to the PX tank area (1), and the other of the thermometers is arranged on the PX pipeline (3) close to CNOOC (2).

2. The outer pipe gallery PX pipeline heating facility according to claim 1 is characterized in that: The fourth pipeline (7) is provided with a second valve (9).

3. The outer pipe gallery PX pipeline heating facility according to claim 1 is characterized in that: The second pipeline (5) and the third pipeline (6) are respectively closely attached to the upper surface and the lower surface of the PX pipeline (3).

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