Propane dehydrogenation unit liquid discharge system

Abstract

The utility model belongs to propane dehydrogenation device technical field, specifically discloses a kind of propane dehydrogenation device drainage system, it includes: feed vaporization tank, feed vaporizer, deoiling tower feed pump;Deoiling tower feed pump has propane inlet;The bottom of feed vaporization tank is communicated with feed vaporizer by first output pipe, the bottom of feed vaporization tank is communicated with propane inlet by second output pipe, the lower part of feed vaporizer has end socket, end socket is communicated with propane inlet by fourth output pipe, deoiling tower feed pump has discharge port, discharge port is connected with fifth output pipe.In use, trace water in the liquid phase propane of the bottom of feed vaporizer will be transported to deoiling tower feed pump by fourth output pipe, and propane with C4, C5 component etc. from feed vaporization tank is sent to deoiling tower, to avoid trace water in propane accumulation in the bottom of feed vaporizer, drainage is simpler, guarantee the normal use of feed vaporizer.

Description

Technical Field

[0001] This utility model relates to the technical field of propane dehydrogenation equipment, and in particular to a liquid discharge system for a propane dehydrogenation equipment. Background Technology

[0002] The propane dehydrogenation unit uses propane as feedstock to produce propylene and hydrogen-rich tail gas. It consists of a feed vaporizer and a feed vaporization tank. The feed vaporizer primarily provides a heat source for the feed vaporization tank, heating the low-temperature, ambient-temperature liquid propane into gaseous propane. This gaseous propane is then heated in a downstream furnace and used as reactor feed for the dehydrogenation reaction. The ambient-temperature propane entering the feed vaporization tank contains trace amounts of water. Because the height of the feed vaporizer is lower than that of the feed vaporization tank, this trace water gradually accumulates in the lower end cap of the feed vaporizer. Therefore, the feed vaporizer needs to be drained periodically. Currently, the draining method involves a drain pipe connected to the bottom of the feed vaporizer. When drainage is required, this pipe is opened to discharge both the liquid propane and liquid water. However, during the actual drainage process, the liquid propane will rapidly vaporize during drainage, causing the drainage pipe to cool down to below 0°C. The liquid water in the liquid propane at the lower end cap of the feed vaporizer will immediately freeze, causing the lower end cap of the feed vaporizer and the drainage pipe to freeze and become blocked, resulting in drainage difficulties. Utility Model Content

[0003] The purpose of this invention is to provide a liquid drainage system for a propane dehydrogenation unit to solve the technical problem in the prior art where the lower end cap of the feed vaporizer and the liquid drainage pipe freeze and become blocked during liquid drainage, leading to difficulties in liquid drainage.

[0004] To achieve the above objectives, this utility model provides a propane dehydrogenation unit drainage system, comprising: a feed vaporization tank, a feed vaporizer, and a deoiling tower feed pump; the deoiling tower feed pump has a propane inlet; the bottom of the feed vaporization tank is connected to the feed vaporizer via a first output pipe, and the bottom of the feed vaporization tank is connected to the propane inlet via a second output pipe; the top of the feed vaporizer has a first gaseous propane outlet, and the first gaseous propane outlet is connected to the feed vaporization tank via a third output pipe; the lower part of the feed vaporizer has a cap, and the cap is connected to the propane inlet via a fourth output pipe; the deoiling tower feed pump has an outlet, and the outlet is connected to a fifth output pipe, which is used to connect to the deoiling tower.

[0005] Preferably, the fourth output pipe is equipped with a first shut-off valve.

[0006] Preferably, the fifth output pipe is provided with a second shut-off valve.

[0007] Preferably, the fifth output pipe is provided with a first check valve, which is located on the pipe between the second shut-off valve and the discharge port.

[0008] Preferably, it further includes: a first branch pipe; the first branch pipe is connected to the first output pipe, and the first branch pipe is used to connect to the flare line.

[0009] Preferably, the first branch pipe is provided with a third shut-off valve and a second check valve, wherein the third shut-off valve is located on the pipe between the second check valve and the first output pipe.

[0010] Preferably, it further includes: a feed pipe; the feed pipe is connected to the propane inlet; and the fourth output pipe and the second output pipe are connected to the propane inlet through the feed pipe, and the feed pipe is provided with a fourth shut-off valve.

[0011] Preferably, the top of the feed vaporization tank is provided with a second gaseous propane outlet, and the second gaseous propane outlet is connected to a sixth outlet pipe.

[0012] The beneficial effects of the propane dehydrogenation device drainage system provided by this utility model are as follows: the lower end cap of the feed vaporizer is connected to the propane inlet of the deoiling tower feed pump through the fourth output pipe. During use, the trace water in the liquid propane at the bottom of the feed vaporizer will be transported to the deoiling tower feed pump through the fourth output pipe, and together with the propane with C4, C5 and other components from the feed vaporizer, it will be sent to the deoiling tower. This avoids the accumulation of trace water in the propane at the bottom of the feed vaporizer, making drainage simpler. In this way, the hidden danger of freezing and blockage of the lower end cap of the feed vaporizer and the drainage pipe is eliminated from the source, ensuring that water will not accumulate at the bottom of the feed vaporizer and guaranteeing the normal use of the feed vaporizer.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the liquid discharge system of the propane dehydrogenation device according to an embodiment of the present invention.

[0015] In the diagram, 100 is the feed vaporizer; 110 is the second gaseous propane outlet; 120 is the conveying pipe; 200 is the feed vaporizer; 210 is the first gaseous propane outlet; 300 is the deoiling tower feed pump; 310 is the propane inlet; 320 is the outlet; 330 is the feed pipe; 331 is the fourth shut-off valve; 400 is the first output pipe; 410 is the first branch pipe; 411 is the third shut-off valve; 412 is the second check valve; 500 is the second output pipe; 600 is the third output pipe; 700 is the fourth output pipe; 710 is the first shut-off valve; 800 is the fifth output pipe; 810 is the second shut-off valve; 820 is the first check valve; and 900 is the sixth output pipe. Detailed Implementation

[0016] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0017] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 utility model.

[0018] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0019] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0020] Please refer to the following: Figure 1 The liquid discharge system of the propane dehydrogenation device provided in the embodiments of this utility model will now be described.

[0021] like Figure 1As shown, the propane dehydrogenation unit drainage system of this utility model embodiment includes: a feed vaporization tank 100, a feed vaporizer 200, and an oil removal tower feed pump 300; the oil removal tower feed pump 300 has a propane inlet 310; the bottom of the feed vaporization tank 100 is connected to the feed vaporizer 200 through a first output pipe 400, and the bottom of the feed vaporization tank 100 is connected to the propane inlet 310 through a second output pipe 500; the feed vaporizer 200... The top of the device has a first gaseous propane outlet 210, which is connected to the feed vaporizer 100 via a third outlet pipe 600; the lower part of the feed vaporizer 200 has a head, which is connected to the propane inlet 310 via a fourth outlet pipe 700; the deoiling tower feed pump 300 has an outlet 320, which is connected to a fifth outlet pipe 800, which is used to connect to the deoiling tower.

[0022] The feed vaporization tank 100 can be connected to both low-temperature liquid propane and room-temperature liquid propane. These two types of propane can be input via the delivery pipe 120, thus feeding the feed vaporization tank 100. The low-temperature and room-temperature propane will then enter the feed vaporizer 200 for heating and vaporization. The vaporized gaseous propane will be output from the first gaseous propane outlet 210 and return to the feed vaporization tank 100 via the third outlet pipe 600. The top of the feed vaporization tank 100 is equipped with a second gaseous propane outlet 110, which is connected to a sixth outlet pipe 900. After being vaporized by the feed vaporizer 200, the gaseous propane is transported to the feed vaporizer 100 through the third output pipe 600. It is then transported to the downstream heating furnace of the propane dehydrogenation unit through the second gaseous propane output port 110 and the sixth output pipe 900 for heating, and then enters the reactor of the propane dehydrogenation unit for reaction.

[0023] The low-temperature and room-temperature liquid propane contains small amounts of C4 and C5 components, which will accumulate at the bottom of the feed vaporization tank 100. The propane inlet 310 of the deoiling tower feed pump 300 is connected to the bottom of the feed vaporization tank 100 through the second output pipe 500. The deoiling tower feed pump 300 can send propane containing C4 and C5 components to the deoiling tower through the outlet 320 and the fifth output pipe 800, so that the C4 and C5 components can be removed at the deoiling tower.

[0024] The lower end cap of the feed vaporizer 200 is connected to the propane inlet 310 through the fourth output pipe 700. That is, the water in the feed vaporizer 200 can be transported to the deoiling tower feed pump 300 through the fourth output pipe 700, and then transported out of the deoiling tower under the action of the deoiling tower feed pump 300. This avoids the accumulation of trace amounts of water in the propane at the bottom of the feed vaporizer 200, thereby eliminating the hidden danger of freezing and blockage of the lower end cap and drain pipe of the feed vaporizer 200 from the source, and ensuring that water does not accumulate at the bottom of the feed vaporizer 200.

[0025] In this embodiment, the lower end cap of the feed vaporizer 200 is connected to the propane inlet 310 of the deoiling tower feed pump 300 via the fourth output pipe 700. During use, trace amounts of water in the liquid propane at the bottom of the feed vaporizer 200 will be transported to the deoiling tower feed pump 300 via the fourth output pipe 700, and together with the propane of C4 (carbon 4), C5 (carbon 5) components from the feed vaporizer 100, it will be sent to the deoiling tower. This avoids the accumulation of trace amounts of water in the propane at the bottom of the feed vaporizer 200, thereby eliminating the risk of freezing and blockage of the lower end cap and drain pipe of the feed vaporizer 200 from the source, ensuring that water does not accumulate at the bottom of the feed vaporizer 200, and guaranteeing the normal use of the feed vaporizer 200.

[0026] In some embodiments of this utility model, the fourth output pipe 700 is equipped with a first shut-off valve 710. The first shut-off valve 710 is used to cut off or open the passage of the fourth output pipe 700. When the propane dehydrogenation unit is operating normally, the first shut-off valve 710 will open the passage of the fourth output pipe 700, so that the fourth output pipe 700 can maintain a flow state, allowing the trace amount of water in the propane at the bottom of the feed vaporizer 200 to be sent to the deoiling tower through the deoiling tower feed pump 300, thus preventing water from accumulating at the bottom of the feed vaporizer 200. When the unit is shut down or the pipeline is under maintenance, the first shut-off valve 710 can be closed as needed.

[0027] In some embodiments of this invention, the fifth output pipe 800 is equipped with a second shut-off valve 810. The second shut-off valve 810 is used to cut off or open the passage of the fifth output pipe 800. When the propane dehydrogenation unit is operating normally, the second shut-off valve 810 will open the passage of the fifth output pipe 800 so that the deoiling tower feed pump 300 can send propane containing trace amounts of water to the deoiling tower, preventing water from accumulating at the bottom of the feed vaporizer 200. When the unit is shut down or the pipeline is under maintenance, the second shut-off valve 810 can be closed as needed.

[0028] In some embodiments of this utility model, the fifth output pipe 800 is provided with a first check valve 820, which is located on the pipe between the second shut-off valve 810 and the discharge port 320. The first check valve 820 is used to prevent propane from flowing back into the deoiling tower feed pump 300, ensuring the normal operation of the deoiling tower feed pump 300 and avoiding safety accidents.

[0029] In some embodiments of this utility model, it further includes: a first branch pipe 410; the first branch pipe 410 is connected to the first output pipe 400, the first branch pipe 410 is used to communicate with the flare line, the flare line is used to treat unreacted gas and by-products in the device, when there is excess reactant remaining in the feed vaporization tank 100, the excess reactant can be transported to the flare line through the first branch pipe 410 to avoid excessive accumulation of unreacted substances in the feed vaporization tank 100.

[0030] In some embodiments of this invention, a third shut-off valve 411 and a second check valve 412 are provided on the first branch pipe 410. The third shut-off valve 411 is located on the pipe between the second check valve 412 and the first output pipe 400. The second check valve 412 prevents the fluid in the flare line from flowing back to the first output pipe 400. Furthermore, by using the third shut-off valve 411 to control the opening and closing of the first branch pipe 410, it is ensured that the third shut-off valve 411 can be opened when unreacted materials need to be processed, so that the unreacted materials can be transported to the flare line.

[0031] In some embodiments of this utility model, it further includes: a feed pipe 330; the feed pipe 330 is connected to the propane inlet 310; and the fourth output pipe 700 and the second output pipe 500 are connected to the propane inlet 310 through the feed pipe 330, and the feed pipe 330 is provided with a fourth shut-off valve 331. That is, both the fourth output pipe 700 and the second output pipe 500 transport propane to the deoiling tower feed pump 300 through the feed pipe 330. In use, the fourth shut-off valve 331 is opened, making the feed pipe 330 flowable, so that propane can enter the deoiling tower feed pump 300 from the feed pipe 330, and the deoiling tower feed pump 300 can pump propane to the deoiling tower.

[0032] In summary, in this embodiment, the lower end cap of the feed vaporizer 200 is connected to the propane inlet 310 of the deoiling tower feed pump 300 via the fourth output pipe 700. During use, trace amounts of water in the liquid propane at the bottom of the feed vaporizer 200 will be transported to the deoiling tower feed pump 300 via the fourth output pipe 700, and together with the propane containing C4, C5, and other components originating from the feed vaporizer 100, will be sent to the deoiling tower. This prevents the accumulation of trace amounts of water in the propane at the bottom of the feed vaporizer 200, thereby eliminating the risk of freezing and blockage of the lower end cap and drain pipe of the feed vaporizer 200 from the source, ensuring that water does not accumulate at the bottom of the feed vaporizer 200, and guaranteeing the normal operation of the feed vaporizer 200.

[0033] The above are merely preferred embodiments of this 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 this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.

Claims

1. A propane dehydrogenation unit drain system characterized by, include: The system includes a feed vaporizer, a feed vaporizer, and a deoiling tower feed pump. The deoiling tower feed pump has a propane inlet. The bottom of the feed vaporizer is connected to the feed vaporizer via a first output pipe, and the bottom of the feed vaporizer is connected to the propane inlet via a second output pipe. The top of the feed vaporizer has a first gaseous propane outlet, which is connected to the feed vaporizer via a third output pipe. The lower part of the feed vaporizer has a cap, which is connected to the propane inlet via a fourth output pipe. The deoiling tower feed pump has an outlet, which is connected to a fifth output pipe for connection to the deoiling tower.

2. The propane dehydrogenation unit drain system of claim 1, wherein, The fourth output pipe is equipped with a first shut-off valve.

3. The propane dehydrogenation unit drain system of claim 1, wherein, The fifth output pipe is equipped with a second shut-off valve.

4. The propane dehydrogenation unit drain system of claim 3, wherein, The fifth output pipe is equipped with a first check valve, which is located on the pipe between the second shut-off valve and the discharge port.

5. The propane dehydrogenation unit drain system of claim 1, wherein, Also includes: First branch pipe; the first branch pipe is connected to the first output pipe, and the first branch pipe is used to connect to the flare line.

6. The propane dehydrogenation unit drainage system according to claim 5, characterized in that, The first branch pipe is equipped with a third shut-off valve and a second check valve, and the third shut-off valve is located on the pipe between the second check valve and the first output pipe.

7. The propane dehydrogenation unit drainage system according to claim 1, characterized in that, Also includes: Feed pipe; The feed pipe is connected to the propane inlet; and the fourth output pipe and the second output pipe are connected to the propane inlet through the feed pipe, and the feed pipe is equipped with a fourth shut-off valve.

8. The propane dehydrogenation unit drainage system according to claim 1, characterized in that, The top of the feed vaporization tank is provided with a second gaseous propane outlet, and the second gaseous propane outlet is connected to a sixth outlet pipe.

Images