Bridging structure for spraying ethylene glycol inlet pipeline of scraper condenser

Abstract

The utility model discloses a bridging structure for an ethylene glycol spraying inlet pipeline of a scraper condenser, which comprises the scraper condenser, the scraper condenser comprises a horizontal cylinder and a vertical cylinder, and the vertical cylinder is connected to the tail of the horizontal cylinder; the lower part of the right end of the horizontal barrel is connected with the liquid sealing tank through a pipeline; the bottom of the liquid sealing tank is connected with a first spraying pipeline and a second spraying pipeline, the first spraying pipeline is provided with a first centrifugal pump, a first plate heat exchanger and a flow meter, and the second spraying pipeline is provided with a second centrifugal pump and a second plate heat exchanger; the first spraying pipeline and the second spraying pipeline are both connected with a spraying main pipeline, and the spraying main pipeline is fixedly connected with the top of the vertical cylinder; a jumper pipeline is connected between the first spraying pipeline and the second spraying pipeline and provided with a jumper valve. According to the utility model, the jumper pipeline is connected between the first spraying pipeline and the second spraying pipeline, so that the two spraying pipelines share the flow meter, and the flow velocity and the flow rate of spraying EG can be better controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of polyester production, in particular to a bridging structure for a spray ethylene glycol inlet pipeline of a scraper condenser. Background Art

[0002] During the normal production process of the prepolycondensation reactor, tail gas will be generated. After these tail gases enter the scraper condenser, they will be cooled by the sprayed ethylene glycol, and the excess insoluble gas will be extracted by the liquid ring vacuum pump, thus forming a vacuum system. The stability of the vacuum system is beneficial to the stable operation of the entire polyester device and has a positive effect on the subsequent polycondensation reaction. Therefore, in order to ensure the stability of the vacuum system, the stable flow rate of the ethylene glycol used for spraying is a very crucial factor. Usually, the sprayed ethylene glycol is pumped out by a centrifugal pump, heat-exchanged in a plate heat exchanger, and then sent to the scraper condenser for spraying. A regulating valve and a flow meter are added after the plate heat exchanger to achieve the function of controllable flow rate. However, under normal production conditions, there are 2 centrifugal pumps, one in use and one in standby, and the corresponding plate heat exchangers also have one in use and one in standby. There is only one flow meter on the sprayed ethylene glycol pipeline, and the two pipelines are independent of each other. Therefore, after switching the centrifugal pump or the plate heat exchanger, the pipeline will be switched from the pipeline passing through the flow meter to the pipeline without a flow meter, and the internal flow rate of the second sprayed pipeline cannot be normally observed, resulting in a large change in the ethylene glycol spray flow rate and affecting the vacuum.

[0003] Based on the above situation, the utility model proposes a bridging structure for a spray ethylene glycol inlet pipeline of a scraper condenser, which can effectively solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a bridging structure for a spray ethylene glycol inlet pipeline of a scraper condenser. The bridging structure for a spray ethylene glycol inlet pipeline of a scraper condenser provided by the utility model connects a bridging pipeline between the first spray pipeline and the second spray pipeline, so that the originally independent first spray pipeline and the second spray pipeline can be connected to each other. When the first plate heat exchanger is switched to the second plate heat exchanger, the internal flow rate of the second spray pipeline can also be accurately observed through the flow meter, realizing the sharing of the flow meter by the two spray pipelines, thereby better controlling the flow rate and flow of the sprayed EG.

[0005] The utility model is realized through the following technical solutions:

[0006] A bridging structure for the spray ethylene glycol inlet pipeline of a scraper condenser, comprising a scraper condenser, the scraper condenser includes a horizontal cylinder body and a vertical cylinder body, and the vertical cylinder body is connected to the tail of the horizontal cylinder body; the lower right end of the horizontal cylinder body is connected to a sealing liquid tank through a pipeline; the bottom of the sealing liquid tank is connected with a first spray pipeline and a second spray pipeline, the first spray pipeline is successively provided with a first centrifugal pump, a first plate heat exchanger and a flowmeter along the fluid direction, and the second spray pipeline is successively provided with a second centrifugal pump and a second plate heat exchanger along the fluid direction; both the first spray pipeline and the second spray pipeline are connected to a spray main pipeline, and one end of the spray main pipeline is fixedly connected to the top of the vertical cylinder body; a bridging pipeline is connected between the first spray pipeline and the second spray pipeline, and a bridging valve is arranged on the bridging pipeline.

[0007] According to the above technical solution, as a further preferred technical solution of the above technical solution, both ends of the bridging pipeline are respectively connected to the outlet ends of the first plate heat exchanger and the second plate heat exchanger.

[0008] According to the above technical solution, as a further preferred technical solution of the above technical solution, a first regulating valve is arranged on the first spray pipeline.

[0009] According to the above technical solution, as a further preferred technical solution of the above technical solution, a second regulating valve is arranged on the second spray pipeline.

[0010] According to the above technical solution, as a further preferred technical solution of the above technical solution, an umbrella-shaped nozzle is arranged at one end of the spray main pipeline connected to the top of the vertical cylinder body.

[0011] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0012] A bridging structure for the spray ethylene glycol inlet pipeline of a scraper condenser provided by the present invention connects a bridging pipeline between the first spray pipeline and the second spray pipeline, so that the originally independent first spray pipeline and the second spray pipeline can be connected to each other. When the first plate heat exchanger is switched to the second plate heat exchanger, the internal flow rate of the second spray pipeline can also be accurately observed through the flowmeter, realizing the sharing of the flowmeter by the two spray pipelines, thereby better controlling the flow rate and flow of the spray EG. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] To enable those skilled in the art to better understand the technical solution of the present utility model, the following describes the preferred implementation of the present utility model in conjunction with specific embodiments. However, it should be understood that the drawings are only for illustrative purposes and cannot be construed as a limitation on this patent; for better illustration of this embodiment, some components in the drawings will be omitted, enlarged or reduced, which do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as a limitation on this patent.

[0015] Embodiment 1:

[0016] A bridging structure for the spray ethylene glycol inlet pipeline of a scraper condenser, comprising a scraper condenser 1, the scraper condenser 1 includes a horizontal cylinder 101 and a vertical cylinder 102, and the vertical cylinder 102 is connected to the tail of the horizontal cylinder 101; the lower right end of the horizontal cylinder 101 is connected to a sealing liquid tank 2 through a pipeline; a first spray pipeline 3 and a second spray pipeline 4 are connected to the bottom of the sealing liquid tank 2. The first spray pipeline 3 is successively provided with a first centrifugal pump 5, a first plate heat exchanger 6 and a flowmeter 7 along the fluid direction, and the second spray pipeline 4 is successively provided with a second centrifugal pump 8 and a second plate heat exchanger 9 along the fluid direction; both the first spray pipeline 3 and the second spray pipeline 4 are connected to a spray main pipeline 10, and one end of the spray main pipeline 10 is fixedly connected to the top of the vertical cylinder 102; a bridging pipeline 11 is connected between the first spray pipeline 3 and the second spray pipeline 4, and a bridging valve 12 is arranged on the bridging pipeline 11.

[0017] By connecting a bridging pipeline 11 between the first spray pipeline 3 and the second spray pipeline 4, the originally independent first spray pipeline 3 and second spray pipeline 4 can be interconnected. When the first plate heat exchanger 6 is switched to the second plate heat exchanger 9, the internal flow rate of the second spray pipeline 4 can be accurately observed through the flowmeter 7, realizing the sharing of the flowmeter by the two spray pipelines, thereby better controlling the flow rate and flow of the spray EG.

[0018] Further, in another embodiment, both ends of the bridging pipeline 11 are respectively connected to the outlet ends of the first plate heat exchanger 6 and the second plate heat exchanger 9.

[0019] Further, in another embodiment, a first regulating valve 13 is arranged on the first spray pipeline 3.

[0020] Further, in another embodiment, a second regulating valve 14 is arranged on the second spray pipeline 4.

[0021] Further, in another embodiment, an umbrella-shaped nozzle 15 is provided at one end of the spray main pipeline 10 connected to the top of the vertical cylinder 102.

[0022] Based on the description and drawings of the present invention, those skilled in the art can easily manufacture or use a cross-connection structure for the spray ethylene glycol inlet pipeline of a scraper condenser of the present invention, and can produce the positive effects recorded in the present invention.

[0023] Unless otherwise specified, in the present invention, if there are terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms used to describe the orientation or positional relationship in the present invention are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood by combining the drawings and according to specific circumstances.

[0024] Unless otherwise clearly defined and limited, in the present invention, if there are terms such as "set", "connected" and "connected", they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The above are only the preferred embodiments of the present invention, and do not impose any formal limitations on the present invention. Any simple modifications and equivalent changes made to the above embodiments based on the technical essence of the present invention all fall within the protection scope of the present invention.

Claims

1. A bridging structure for the inlet pipe of the scraped condenser spraying ethylene glycol, characterized in that: The scraper condenser (1) comprises a horizontal cylinder (101) and a vertical cylinder (102), wherein the vertical cylinder (102) is connected to the rear of the horizontal cylinder (101); the lower right end of the horizontal cylinder (101) is connected to a sealing liquid tank (2) via a pipeline; the bottom of the sealing liquid tank (2) is connected to a first spray pipeline (3) and a second spray pipeline (4), wherein the first spray pipeline (3) is provided with a first centrifugal pump (5), a first plate heat exchanger ( 6) and a flow meter (7); the second spray pipeline (4) is provided with a second centrifugal pump (8) and a second plate heat exchanger (9) in sequence along the fluid direction; the first spray pipeline (3) and the second spray pipeline (4) are both connected to a spray main pipeline (10), one end of the spray main pipeline (10) is fixedly connected to the top of the vertical cylinder (102); a jumper pipeline (11) is connected between the first spray pipeline (3) and the second spray pipeline (4), and a jumper valve (12) is provided on the jumper pipeline (11).

2. A bridging structure for the scraped condenser spraying ethylene glycol inlet pipe according to claim 1, characterized in that: Both ends of the jumper pipe (11) are respectively connected to the outlet ends of the first plate heat exchanger (6) and the second plate heat exchanger (9).

3. The bridging structure for the scraped condenser spraying ethylene glycol inlet pipe according to claim 1, characterized in that: The first spray pipeline (3) is provided with a first regulating valve (13).

4. The bridging structure for the scraper condenser spraying ethylene glycol inlet pipe according to claim 1, characterized in that: The second spray pipeline (4) is provided with a second regulating valve (14).

5. The bridging structure for the scraped condenser spraying ethylene glycol inlet pipe according to claim 1, characterized in that: An umbrella-shaped nozzle (15) is provided at one end of the spray main pipeline (10) connected to the top of the vertical cylinder (102).

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