Safe conveying device for medium-pressure high-temperature process condensed water

Abstract

The utility model discloses a safe conveying device for medium-pressure high-temperature process condensed water, which comprises a medium-pressure condensed water flash tank and a hot water / condensed water heat exchanger, a medium-pressure condensed water pipeline of a reboiler at the bottom of a stabilizing tower is connected with a medium-pressure condensed water pipeline of a reboiler at the bottom of a re-desorption tower, and then is connected to the medium-pressure condensed water flash tank; one end of the medium-pressure condensed water flash tank is connected with a 0.5 Mpa steam header pipe through a post-flash 0.5 Mpa steam conveying pipeline, the other end of the medium-pressure condensed water flash tank is connected with a hot water / condensed water heat exchanger tube pass through a post-flash condensed water conveying pipeline, and the post-flash condensed water conveying pipeline is provided with a regulating valve; and the other end of the hot water / condensed water heat exchanger tube pass is connected with a condensed water main pipe through a condensed water conveying pipeline after heat exchange. The device has the advantages of being reasonable in structural design, safe, stable and capable of reducing production cost.

Description

Technical Field

[0001] This utility model relates to a propane dehydrogenation device, specifically to a medium-pressure condensate conveying device in a propane dehydrogenation production line. Background Technology

[0002] In the production process of propane dehydrogenation unit, the amount of steam used is large, and the temperature difference of the process condensate generated by each production unit is large. In particular, the medium-pressure condensate generated by the bottom reboiler of the stabilizer tower and the re-desorption tower has a high temperature. In the existing technology, the above medium-pressure condensate is directly collected through pipelines. During the transportation process, water hammer is likely to occur in the pipeline due to the influence of temperature difference and pressure, which poses a safety hazard. Summary of the Invention

[0003] The technical problem solved by this utility model is to cool down the medium-pressure condensate generated by the bottom reboiler of the stabilizer tower and the re-desorption tower, thereby reducing the temperature difference of the process condensate in each production unit of the propane dehydrogenation production line, which helps to reduce or avoid water hammer, and at the same time achieves energy saving and consumption reduction.

[0004] To achieve the above objectives, the present invention provides a medium-pressure, high-temperature process condensate safety conveying device, comprising a medium-pressure condensate flash tank and a hot water / condensate heat exchanger. The medium-pressure condensate pipeline is connected to the bottom reboiler of the stabilizer tower and the re-desorption tower, and then connected to the medium-pressure condensate flash tank. One end of the medium-pressure condensate flash tank is connected to the 0.5 MPa steam main, and the other end is connected to the tube side of the hot water / condensate heat exchanger. A regulating valve is provided between the medium-pressure condensate flash tank and the tube side of the hot water / condensate heat exchanger. The other end of the tube side of the hot water / condensate heat exchanger is connected to the process condensate main.

[0005] The shell side of the hot water / condensate heat exchanger 7 is connected to the circulating water system, which cools the water in the tube side on the one hand, and outputs hot water through the shell side on the other.

[0006] In the above technical solution, since it includes a medium-pressure condensate flash tank and a hot water / condensate heat exchanger, the medium-pressure condensate pipelines of the stabilizer tower and the reboiler at the bottom of the re-desorption tower are connected to the medium-pressure condensate flash tank. One end of the medium-pressure condensate flash tank is connected to the 0.5 MPa steam main, and the other end is connected to the tube side of the hot water / condensate heat exchanger. A regulating valve is provided between the medium-pressure condensate flash tank and the tube side of the hot water / condensate heat exchanger. The other end of the tube side of the hot water / condensate heat exchanger is connected to the process condensate main. With the above structure, the medium-pressure condensate generated by the bottom reboiler of the stabilizer and re-desorption tower is flashed through a medium-pressure condensate flash tank to generate 0.5 MPa steam and flash-flashed condensate. The 0.5 MPa steam is transported to the 0.5 MPa steam main via pipeline, and the flash-flashed condensate is transported to the hot water / condensate heat exchanger tube side and shell side hot water for heat exchange and cooling. This achieves full recovery of the waste heat of the medium-pressure condensate generated by the bottom reboiler of the stabilizer and re-desorption tower, ensuring that the temperature is close to that of the condensate generated by each propane dehydrogenation unit. This eliminates the water hammer phenomenon after the medium-pressure condensate generated by the bottom reboiler of the stabilizer and re-desorption tower flows into the condensate main, thus achieving safe and stable transportation of condensate from each unit.

[0007] This utility model has the following advantages:

[0008] 1. It achieves cooling of condensate and eliminates the water hammer phenomenon caused by the medium-pressure condensate generated by the bottom reboiler of the stabilizer tower and the re-desorption tower flowing into the condensate main pipe.

[0009] 2. To maximize enterprise profits, the medium-pressure condensate generated by the stabilizer and reboiler at the bottom of the re-desorption tower is flashed to produce 0.5 MPa steam, increasing steam output by 0.5 MPa. The flashed medium-pressure condensate then exchanges heat with the hot water / condensate heat exchanger of the hot water system, achieving full recovery of waste heat from the medium-pressure condensate, saving production costs and reducing energy consumption. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of the medium-pressure high-temperature process condensate safety conveying device of this utility model.

[0011] The correspondence between the labels and component names in the attached figures is as follows:

[0012] 1. Condensate pipeline of the reboiler at the bottom of the stabilizer; 2. Condensate pipeline of the re-desorption tower at the bottom of the reboiler; 3. 0.5 MPa steam main; 4. Medium-pressure condensate flash tank; 5. Control valve; 6. Condensate delivery pipeline after flash evaporation; 7. Hot water / condensate heat exchanger; 8. Condensate delivery pipeline after heat exchange; 9. Condensate main; 10. 0.5 MPa steam delivery pipeline after flash evaporation. Detailed Implementation

[0013] The following is a detailed description of the novel medium-pressure high-temperature process condensate safety conveying device with reference to the accompanying drawings.

[0014] Depend on Figure 1 As can be seen, the medium-pressure high-temperature process condensate safety conveying device of this utility model includes a medium-pressure condensate flash tank 4 and a hot water / condensate heat exchanger 7. The medium-pressure condensate pipeline 1 of the bottom reboiler of the stabilizer tower and the medium-pressure condensate pipeline 2 of the bottom reboiler of the re-desorption tower are connected to the medium-pressure condensate flash tank 4. One end of the medium-pressure condensate flash tank 4 is connected to the 0.5 MPa steam main pipe 3 via the flash evaporation 0.5 MPa steam conveying pipeline 10, and the other end is connected to the tube side of the hot water / condensate heat exchanger 7 via the flash evaporation condensate conveying pipeline 6. The flash evaporation condensate conveying pipeline 6 is equipped with a regulating valve 5. The other end of the hot water / condensate heat exchanger 7 is connected to the condensate main pipe 9 via the heat exchange condensate conveying pipeline 8.

[0015] See Figure 1 In operation, this invention uses a medium-pressure condensate flash tank 4 to flash the medium-pressure condensate generated by the bottom reboiler of the stabilizer and re-desorption tower, producing 0.5 MPa steam and flash-flashed condensate. The 0.5 MPa steam is then transported to the 0.5 MPa steam main 3 via the flash-flashed 0.5 MPa steam pipeline 10. The flash-flashed condensate is then transported to the hot water / condensate heat exchanger 7 via the flash-flashed condensate pipeline 6 for heat exchange and cooling between the tube side and shell side hot water. The flow rate of the flash-flashed condensate is controlled by the regulating valve 5. This allows for the full recovery of the waste heat from the medium-pressure condensate generated by the bottom reboiler of the stabilizer and re-desorption tower, ensuring that the temperature is close to that of the condensate generated by each propane dehydrogenation unit. This eliminates the water hammer phenomenon that occurs when the medium-pressure condensate from the bottom reboiler of the stabilizer and re-desorption tower flows into the condensate main, thus achieving safe and stable condensate transport from each unit and significantly reducing production costs.

[0016] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A device for safe delivery of medium pressure high temperature process condensate water comprising a medium pressure condensate water flash tank (4) and a hot water / condensate water heat exchanger (7), characterized in that: The stable tower bottom reboiler medium pressure condensate pipeline (1) and the re-desorption tower bottom reboiler medium pressure condensate pipeline (2) are connected, and then connected to the medium pressure condensate flash tank (4), one end of the medium pressure condensate flash tank (4) is connected with the 0.5Mpa steam main pipe (3) through a flash 0.5Mpa steam delivery pipeline (10), the other end is connected with the hot water / condensate heat exchanger (7) pipe through a flash condensate delivery pipeline (6), and an adjusting valve (5) is arranged on the flash condensate delivery pipeline (6); the other end of the hot water / condensate heat exchanger (7) pipe is connected with the condensate main pipe (9) through a heat-exchanged condensate delivery pipeline (8).

2. The MP-AVT process condensate water safe delivery apparatus as claimed in claim 1, wherein: The shell side of the hot water / condensate heat exchanger (7) is connected with a circulating water system.

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