A propane and propylene separation system

Abstract

The utility model relates to compound separation technical field discloses a kind of propane and propylene separation system, comprising: separation tower;Heat pump compressor, the inlet of heat pump compressor is communicated with the first outlet of separation tower;Reboiler, the first inlet of reboiler is communicated with the outlet of heat pump compressor, the first outlet of reboiler is communicated with the first inlet of separation tower, the second inlet of reboiler is communicated with the second outlet of separation tower;Backflow tank, the inlet of backflow tank is communicated with the second outlet of reboiler, the outlet of backflow tank is communicated with the second inlet of separation tower;And drainage pump, the second outlet of separation tower, the third outlet of separation tower and the second outlet of reboiler are communicated with the drainage pump.The propane and propylene separation system of the utility model improves the recovery efficiency of material, guarantees operation safety and reliability.

Description

Technical Field

[0001] This utility model relates to the field of compound separation technology, and in particular to a propane and propylene separation system. Background Technology

[0002] The separation of propane and propylene mainly includes distillation, adsorption, chemical reaction, atmospheric distillation, cryogenic liquid separation, and condensation separation. Distillation utilizes the difference in boiling points between propane and propylene to separate them. By distilling a mixed gas at specific temperature and pressure, propane and propylene are concentrated in different temperature ranges and then collected separately. The separation tower is the core unit in the distillation process. When the separation tower is shut down, the overall pressure drops due to the lack of a heat source, leaving a large amount of liquid material inside. Prolonged shutdown can cause vaporization, resulting in material loss. Furthermore, the inconvenience of discharging a large amount of material poses a safety hazard. Utility Model Content

[0003] The purpose of this invention is to provide a propane and propylene separation system that improves material recovery efficiency and ensures safe and reliable operation.

[0004] To achieve the above objectives, this utility model provides a propane and propylene separation system, comprising:

[0005] Separation tower;

[0006] A heat pump compressor, the inlet of which is connected to the first outlet of the separation tower;

[0007] The reboiler has a first inlet connected to the outlet of the heat pump compressor, a first outlet connected to the first inlet of the separation tower, and a second inlet connected to the second outlet of the separation tower.

[0008] A reflux tank, the inlet of which is connected to the second outlet of the reboiler, and the outlet of which is connected to the second inlet of the separation column; and

[0009] A drain pump is connected to the second outlet of the separation tower, the third outlet of the separation tower, and the second outlet of the reboiler.

[0010] The first outlet and second inlet of the separation tower are located at its top, the first inlet of the separation tower is located in its middle, and the second outlet and third outlet of the separation tower are both located at its bottom; the inlet of the reflux tank is located at its top or bottom, and the outlet of the reflux tank is located at its bottom; the first inlet of the reboiler is located in its middle, the first outlet of the reboiler is located at its top, and the second inlet and second outlet of the reboiler are both located at its bottom.

[0011] In some embodiments, a first valve is included, which is installed on a pipeline connecting the first outlet of the separation tower to the inlet of the heat pump compressor.

[0012] In some embodiments, a second valve is included, which is installed on a pipeline connecting the first inlet of the reboiler to the outlet of the heat pump compressor.

[0013] In some embodiments, a third valve is included, which is installed on the pipeline connecting the first outlet of the reboiler and the first inlet of the separation tower.

[0014] In some embodiments, a fourth valve is included, which is installed on the pipeline connecting the second inlet of the reboiler and the second outlet of the separation column.

[0015] In some embodiments, a fifth valve and a drain line are included, wherein the drain pump is connected to the second outlet of the separation tower, the third outlet of the separation tower and the second outlet of the reboiler through the drain line, and the drain line is located below the bottom of the separation tower and the bottom of the reboiler, and the fifth valve is installed on the drain line.

[0016] In some embodiments, a sixth valve is included, which is installed on the pipeline connecting the outlet of the reflux tank to the second inlet of the separation tower.

[0017] In some embodiments, a seventh valve is included, installed on a pipeline connecting the discharge pump to the second outlet of the separation tower, the third outlet of the separation tower, and the second outlet of the reboiler.

[0018] In some embodiments, a cooler is included, and the outlet of the reflux tank is connected to a second inlet of the separation tower via the cooler.

[0019] In some embodiments, a collection line is included, through which the inlet of the cooler is connected to the drain pump.

[0020] This invention provides a propane and propylene separation system, which has the following advantages compared with the prior art:

[0021] The inlet of the heat pump compressor is connected to the first outlet of the separation tower, the first inlet of the reboiler is connected to the outlet of the heat pump compressor, the first outlet of the reboiler is connected to the first inlet of the separation tower, the second inlet of the reboiler is connected to the second outlet of the separation tower, the inlet of the reflux tank is connected to the second outlet of the reboiler, and the outlet of the reflux tank is connected to the second inlet of the separation tower. In this way, propane and propylene can be separated in a cycle. The drain pump is connected to the second and third outlets of the separation tower and the second outlet of the reboiler. The drain pump can improve the material recovery efficiency when the separation tower is shut down, and ensure safe and reliable operation. Attached Figure Description

[0022] Figure 1 This is a first three-dimensional structural schematic diagram of the propane and propylene separation system provided in an embodiment of the present invention.

[0023] In the diagram: 1. Separation tower; 2. Heat pump compressor; 3. Reboiler; 4. Reflux tank; 5. Drain pump; 6. First valve; 7. Second valve; 8. Third valve; 9. Fourth valve; 10. Fifth valve; 11. Sixth valve; 12. Seventh valve; 13. Cooler; 14. Collection pipeline. Detailed Implementation

[0024] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0025] It should be understood that in the description of this application, the terms "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. That is, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, unless otherwise stated, "a plurality of" means two or more.

[0026] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0027] like Figure 1As shown, the propane and propylene separation system of this utility model embodiment includes: a separation tower 1, a heat pump compressor 2, a reboiler 3, a reflux tank 4, and a discharge pump 5. The separation tower 1 separates propane and propylene through distillation. The propane separated at the bottom of the separation tower 1 is returned to the feed system as recycled propane, and the propylene separated at the top of the separation tower 1 is produced as a product. Specifically, the feed is introduced into the middle of the separation tower 1. Through distillation, the upper part of the separation tower 1 contains vaporized gaseous propylene, and the bottom part contains liquid propane and heavy components. The first outlet and second inlet of the separation tower 1 are located at its top, the first inlet is located in its middle, and the second and third outlets are both located at its bottom.

[0028] The inlet of the heat pump compressor 2 is connected to the first outlet of the separation tower 1. The heat pump compressor 2 is used to compress gaseous propylene, and the heat generated by the heat pump compressor 2 can exchange heat with the reboiler 3 of the separation tower 1. Since the first outlet of the separation tower 1 is located at its top, gaseous propylene enters the heat pump compressor 2.

[0029] The first inlet of reboiler 3 is connected to the outlet of heat pump compressor 2, the first outlet of reboiler 3 is connected to the first inlet of separation tower 1, and the second inlet of reboiler 3 is connected to the second outlet of separation tower 1. Reboiler 3 vaporizes liquid propylene and liquid propane, and inputs the vaporized components into separation tower 1, thereby enabling reboiler 3 to transfer heat from heat pump compressor 2 to separation tower 1. The first inlet of reboiler 3 is located in its middle, the first outlet of reboiler 3 is located at its top, and both the second inlet and second outlet of reboiler 3 are located at its bottom.

[0030] The inlet of reflux tank 4 is connected to the second outlet of reboiler 3, and the outlet of reflux tank 4 is connected to the second inlet of separation tower 1. Reflux tank 4 is used to store propylene product, with most of the propylene used as reflux and a small portion collected as propylene product to maintain smooth fluctuations in the collection. The inlet of reflux tank 3 is located at its top or bottom, and the outlet of reflux tank 3 is located at its bottom.

[0031] The discharge pump 5 is connected to the second outlet of separation tower 1, the third outlet of separation tower 1, and the second outlet of reboiler 3. With this configuration, the discharge pump 5 can recover as much propane and propylene as possible from separation tower 1 during shutdown, minimizing losses.

[0032] It should be noted that during the liquid discharge process after the separation tower 1 is shut down, due to the large pipe size at the outlet of the heat pump compressor 2, the liquid material is not easily emptied. The material is forced out of the pipe by the medium-pressure nitrogen (2.0 MPa) at the outlet of the heat pump compressor 2, providing static pressure to the discharge pump 5, maintaining stable operation of the discharge pump 5 and increasing the discharge speed. The discharge pipelines of the discharge pump 5 are all installed at the lowest point of each piece of equipment to ensure material discharge. When the separation tower 1 is operating normally, a double valve with a blind flange can be used to isolate the medium-pressure nitrogen (2.0 MPa) at the outlet of the heat pump compressor 2 from the material in the system; when the separation tower 1 is shut down and discharging material, the blind flange is opened, thereby introducing the medium-pressure nitrogen (2.0 MPa) at the outlet of the heat pump compressor 2.

[0033] Based on the above structure, propane and propylene can be cyclically separated through separation tower 1, heat pump compressor 2, reboiler 3, reflux tank 4 and discharge pump 5. This can improve the material recovery efficiency and ensure safe and reliable operation when separation tower 1 is shut down.

[0034] In some embodiments, a first valve 6 is included, which is installed on a pipeline communicating with the first outlet of the separation tower 1 and the inlet of the heat pump compressor 2. This allows control over the connection and disconnection between the first outlet of the separation tower 1 and the inlet of the heat pump compressor 2.

[0035] In some embodiments, a second valve 7 is included, which is installed on the pipeline connecting the first inlet of the reboiler 3 and the outlet of the heat pump compressor 2. This allows control over the on / off connection between the first inlet of the reboiler 3 and the outlet of the heat pump compressor 2.

[0036] In some embodiments, a third valve 8 is included, which is installed on the pipeline connecting the first outlet of the reboiler 3 and the first inlet of the separation tower 1. This allows for control of the on / off connection between the first outlet of the reboiler 3 and the first inlet of the separation tower 1.

[0037] In some embodiments, a fourth valve 9 is included, which is installed on the pipeline connecting the second inlet of the reboiler 3 and the second outlet of the separation tower 1. This allows for control of the on / off connection between the second inlet of the reboiler 3 and the second outlet of the separation tower 1.

[0038] In some embodiments, a fifth valve 10 and a drain line are included. The drain pump 5 is connected to the second outlet of the separation tower 1, the third outlet of the separation tower 1, and the second outlet of the reboiler 3 via the drain line, and the drain line is located below the bottom of the separation tower 1 and the bottom of the reboiler 3. The fifth valve 10 is installed on the drain line. In this way, the drain line connected to the drain pump 5 can be cut off, thereby controlling the draining process and ensuring the removal of material.

[0039] In some embodiments, a sixth valve 11 is included, which is installed on the pipeline connecting the outlet of the reflux tank 4 and the second inlet of the separation tower 1. This allows for control of the on / off connection between the outlet of the reflux tank 4 and the second inlet of the separation tower 1.

[0040] In some embodiments, a seventh valve 12 is included, installed on the pipeline connecting the discharge pump 5 to the second outlet of the separation tower 1, the third outlet of the separation tower 1, and the second outlet of the reboiler 3. This allows for the control of the on / off states between the discharge pump 5 and the second outlet of the separation tower 1, the third outlet of the separation tower 1, and the second outlet of the reboiler 3, thereby controlling the discharge process.

[0041] In some embodiments, a cooler 13 is included, and the outlet of the reflux tank 4 is connected to the second inlet of the separation tower 1 through the cooler 13. The condensed liquid propylene is cooled by the cooler 13, refluxed back into the separation tower 1 through the first outlet of the cooler 13, and discharged as product through the second outlet of the cooler 13.

[0042] In some embodiments, a collection pipe 14 is included, through which the inlet of the cooler 13 is connected to the drain pump 5. This facilitates the removal of material from the cooler 13.

[0043] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A propane and propylene separation system characterized by, include: Separation tower; A heat pump compressor, wherein the inlet of the heat pump compressor is connected to the first outlet of the separation tower; A reboiler, wherein the first inlet of the reboiler is connected to the outlet of the heat pump compressor, the first outlet of the reboiler is connected to the first inlet of the separation tower, and the second inlet of the reboiler is connected to the second outlet of the separation tower; A reflux tank, the inlet of which is connected to the second outlet of the reboiler, and the outlet of which is connected to the second inlet of the separation column; and A drain pump is connected to the second outlet of the separation tower, the third outlet of the separation tower, and the second outlet of the reboiler.

2. The propane and propylene separation system of claim 1, wherein, Includes a first valve, which is installed on the pipeline connecting the first outlet of the separation tower to the inlet of the heat pump compressor.

3. The propane and propylene separation system of claim 1, wherein, It includes a second valve, which is installed on the pipeline connecting the first inlet of the reboiler to the outlet of the heat pump compressor.

4. The propane and propylene separation system of claim 1, wherein, Includes a third valve, which is installed on the pipeline connecting the first outlet of the reboiler and the first inlet of the separation tower.

5. The propane and propylene separation system of claim 1, wherein, It includes a fourth valve, which is installed on the pipeline connecting the second inlet of the reboiler and the second outlet of the separation tower.

6. The propane and propylene separation system of claim 1, wherein, Includes a fifth valve and a drain line. The drain pump is connected to the second outlet of the separation tower, the third outlet of the separation tower, and the second outlet of the reboiler through the drain line. The drain line is located at the bottom of the separation tower and below the bottom of the reboiler. The fifth valve is installed on the drain line.

7. The propane and propylene separation system of claim 1, wherein, It includes a sixth valve, which is installed on the pipeline connecting the outlet of the reflux tank and the second inlet of the separation tower.

8. The propane and propylene separation system of claim 1, wherein, It includes a seventh valve, which is installed on the pipeline connecting the discharge pump to the second outlet of the separation tower, the third outlet of the separation tower, and the second outlet of the reboiler.

9. The propane and propylene separation system of claim 1, wherein, Includes a cooler, and the outlet of the reflux tank is connected to the second inlet of the separation tower via the cooler.

10. The propane and propylene separation system of claim 9, wherein, It includes a collection pipeline, through which the inlet of the cooler is connected to the drain pump.

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