Slurry catalyst feeding system

Abstract

The utility model discloses a feeding system of a slurry catalyst. The catalyst feeding tank vertically penetrates through the frame, and the outer wall of the catalyst feeding tank is fixedly connected with a plurality of brackets in the circumferential direction; the weighing device is installed between the support and the frame, and a plurality of weighing sensors of the weighing device correspond to the support. The high-pressure side input end of the differential pressure liquid level meter is connected to the bottom of the catalyst feeding tank, and the low-pressure side input end of the differential pressure liquid level meter is connected to the top gas phase space of the catalyst feeding tank; a stopping and interlocking module of the conveying pump is in signal connection with the output end of the weighing device and the output end of the differential pressure liquid level meter; one end of each supporting device is detachably connected to the frame, and the other end of each supporting device abuts against the side, away from the catalyst feeding tank, of the corresponding support. Therefore, through dual metering of the differential pressure liquid level meter and the weighing device and a two-out-of-two logic judgment mechanism of the conveying pump interlocking and stopping module, the problem of catalyst feeding interruption caused by data abnormity is effectively avoided, and stable operation of the whole system is ensured.

Description

Technical Field

[0001] This application relates to the field of polyethylene production technology, and more particularly to a slurry catalyst feeding system. Background Technology

[0002] In polyethylene production plants, the slurry catalyst feeding system is a crucial step in ensuring the smooth progress of the polymerization reaction. This system typically includes a catalyst feed tank, a transfer pump, a reactor, and related control equipment. The catalyst feed tank stores pre-mixed catalyst. When the liquid level in the tank drops to 30%, purified nitrogen gas is used to pressurize the catalyst into the feed tank. The transfer pump then continuously injects the catalyst into the reactor to maintain the stable progress of the polymerization reaction.

[0003] However, in practice, when nitrogen gas is directly introduced into the catalyst feed tank, it can cause distortion in the differential pressure level gauge reading. The differential pressure level gauge determines the liquid level by measuring the static pressure difference within the catalyst feed tank. However, when nitrogen gas enters the tank, the pressure distribution changes, causing the gauge reading to deviate. This distortion can lead to malfunctions in the delivery pump, causing it to stop working prematurely before the liquid level reaches the set value, thus interrupting the catalyst feed to the reactor. This interruption directly affects the stability of the polymerization reaction, consequently impacting the quality and yield of the polyethylene product. Utility Model Content

[0004] This application provides a slurry catalyst feeding system, which solves the problems mentioned in the background art.

[0005] This application provides a slurry catalyst feeding system, including a frame, a catalyst feed tank, a transfer pump, a reactor, a differential pressure level gauge, a weighing device, multiple support devices, and multiple brackets. The catalyst feed tank is vertically installed through the frame, and multiple brackets are fixedly connected to its outer wall circumferentially. The weighing device is installed between the brackets and the frame, and multiple weighing sensors of the weighing device correspond to the brackets. The weighing device is used to weigh the weight of the catalyst in the catalyst feed tank in real time. The longitudinal section of the brackets is triangular. The high-pressure side input of the differential pressure level gauge is connected to the bottom of the catalyst feed tank, and its low-pressure side input is connected to the catalyst feed tank. The top gas phase space; the stop interlock module of the delivery pump is connected to the output end of the weighing device and the output end of the differential pressure level gauge respectively. When both the weighing data and the differential pressure data exceed the preset threshold, the delivery pump is triggered to stop; one end of each of the multiple support devices is detachably connected to the frame, and the other end abuts against the side of the corresponding bracket away from the catalyst feed tank, in order to limit the radial displacement of the catalyst feed tank; the first input end of the catalyst feed tank is connected to the catalyst raw material through the feed pipeline, the second input end is connected to the nitrogen source through the nitrogen pipeline, and the output end is connected to the inlet of the delivery pump through the delivery pipeline; the outlet of the delivery pump is connected to the reactor.

[0006] In one possible implementation, the slurry catalyst feeding system further includes multiple receiving and discharging devices and multiple limiting members; one end of each of the multiple supporting devices is rotatably connected to the frame; one end of each of the multiple limiting members is connected to the top surface of the frame, and the other end of each of the limiting members corresponds to the supporting device, and the multiple limiting members are located between the corresponding supporting device and the weighing device; the top surface of the limiting member has the same slope as the side of the support facing the supporting device and is located in the same plane, and the limiting member is used to limit the rotation angle of the supporting device; one end of each of the multiple receiving and discharging devices is detachably connected to the frame, and the other end of each of the multiple receiving and discharging devices is connected to the side of the corresponding supporting device away from the support.

[0007] In one possible implementation, the support device has a groove on the side away from the corresponding bracket and a plurality of first connecting holes along its height direction; the retractable device has a second connecting hole corresponding to the first connecting hole at the end facing the groove.

[0008] In one possible implementation, the slurry catalyst feeding system further includes multiple height adjustment devices; one end of each of the multiple height adjustment devices is mounted on the top surface of the frame, and the other end of each corresponds to a specific support; when the height adjustment device is not in operation, its height is lower than the height of the weighing device.

[0009] In one possible implementation, the slurry catalyst feeding system further includes multiple shock absorbers; the multiple shock absorbers are respectively disposed between the top surface of the weighing device and the bottom surface of the corresponding support.

[0010] In one possible implementation, both the feed line and the delivery line are flexible hoses.

[0011] In one possible implementation, the top surface of the frame is provided with a receiving slot for accommodating a plurality of weighing sensors of the weighing device.

[0012] One or more technical solutions provided in the embodiments of this application have at least the following technical effects:

[0013] The slurry catalyst feeding system provided in this application includes a frame, a catalyst feed tank, a delivery pump, a reactor, a differential pressure level gauge, a weighing device, multiple support devices, and multiple brackets. When the liquid level in the catalyst feed tank drops to a preset threshold, the catalyst begins to be fed into the catalyst feed tank through the feed pipeline. Simultaneously, nitrogen gas is also introduced into the catalyst feed tank through a nitrogen pipeline to assist in catalyst delivery. At this time, the weighing device begins to monitor the weight of the catalyst in the catalyst feed tank in real time to ensure accurate catalyst dosage. On the other hand, the differential pressure level gauge indirectly monitors and provides real-time feedback on the catalyst level change data in the catalyst feed tank by measuring the pressure difference between the bottom and top gas phase spaces of the catalyst feed tank. This dual monitoring mechanism provides a strong guarantee for the stable operation of the system.

[0014] To further enhance the system's stability, multiple support devices effectively limit the radial displacement of the catalyst feed tank during operation, ensuring the accuracy of the weighing system's measurements.

[0015] In terms of safety, this application has taken meticulous consideration. When both the weighing data and the differential pressure data exceed the preset threshold, the stop interlock module of the delivery pump will be triggered immediately, causing the delivery pump to stop, thereby preventing the catalyst from continuing to enter the reactor and ensuring the safe operation of the system. However, to avoid interruption of catalyst feeding due to a single data anomaly, which would affect the stable operation of the entire system.

[0016] Therefore, this application effectively avoids catalyst feeding interruption caused by abnormal data by using dual metering of differential pressure level gauge and weighing device, as well as a two-to-two logic judgment mechanism of the delivery pump stop interlock module, thereby ensuring the stable operation of the entire system. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the feeding system for the slurry catalyst provided in the embodiments of this application;

[0019] Figure 2 for Figure 1 A magnified view of section A in the image.

[0020] Icons: 1-Frame; 2-Catalyst feed tank; 21-Agitator; 3-Transfer pump; 4-Reactor; 5-Differential pressure level gauge; 6-Weighing device; 7-Support device; 71-First connection hole; 8-Bracket; 9-Retracting device; 10-Shock absorber; 11-Height adjustment device; 12-Limiting device. Detailed Implementation

[0021] The technical solutions of 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, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of 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," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0023] This application provides a slurry catalyst feeding system, such as... Figures 1 to 2As shown. The slurry catalyst feeding system includes a frame 1, a catalyst feed tank 2, a transfer pump 3, a reactor 4, a differential pressure level gauge 5, a weighing device 6, multiple support devices 7, and multiple brackets 8. The catalyst feed tank 2 is vertically installed through the frame 1, and multiple brackets 8 are fixedly connected to its outer wall circumferentially. The longitudinal section of the brackets 8 is a triangular structure. The weighing device 6 is installed between the brackets 8 and the frame 1, and multiple weighing sensors of the weighing device 6 correspond to the brackets 8. The weighing device 6 is used to weigh the weight of the catalyst in the catalyst feed tank 2 in real time. The high-pressure side input of the differential pressure level gauge 5 is connected to the bottom of the catalyst feed tank 2, and its low-pressure side input is connected to the top gas phase space of the catalyst feed tank 2. The stop interlock module of the transfer pump 3 is connected to the output of the weighing device 6 and the output of the differential pressure level gauge 5 respectively. When both the weighing data and the differential pressure data exceed the preset threshold, the transfer pump 3 is triggered to stop. One end of each of the multiple support devices 7 is detachably connected to the frame 1, and the other end abuts against the side of the corresponding bracket 8 away from the catalyst feed tank 2, in order to limit the radial displacement of the catalyst feed tank 2.

[0024] Specifically, two first connecting lugs are arranged parallel to each other on the top of the frame 1. Each of the two first connecting lugs is provided with a third connecting hole. The bottom of the support device 7 is provided with a fourth connecting hole corresponding to the third connecting hole. A first fastener passes through one of the third connecting holes, the fourth connecting hole, and the other third connecting hole to fix the support device 7 to the first connecting lugs, thereby preventing the weight of the support device 7 from acting on the bracket 8. The slope of the inclined surface of the support device 7 is consistent with the slope of the corresponding inclined surface of the bracket 8, which can better limit the radial displacement of the catalyst feed tank 2.

[0025] The first input end of the catalyst feed tank 2 is connected to the catalyst feedstock via a feed pipeline, the second input end is connected to a nitrogen source via a nitrogen pipeline, and the output end is connected to the inlet of the transfer pump 3 via a delivery pipeline. The outlet of the transfer pump 3 is connected to the reactor 4.

[0026] Specifically, when the catalyst feed tank 2 is empty, i.e., without catalyst, this application will perform a zeroing operation on the differential pressure level gauge 5 and the weighing device 6 to ensure the accuracy of the monitoring data. This step is a critical part of the calibration process, ensuring that all monitoring data starts from a known and accurate reference point when the catalyst begins to be added to the catalyst feed tank 2.

[0027] During the operation of the catalyst feed tank 2, the agitator 21 uniformly stirs the catalyst to ensure its activity and reaction efficiency. However, the operation of the agitator 21 may generate certain mechanical vibrations and forces, which may cause radial displacement of the catalyst feed tank 2. If such displacement is not controlled, it may threaten the stability and safety of the system. The support device 7 of this application not only effectively limits the radial displacement of the catalyst feed tank 2 during operation, but also ensures its stability under various operating conditions.

[0028] It should be noted that when the liquid level in catalyst feed tank 2 drops to a preset threshold, the catalyst begins to be fed into catalyst feed tank 2 through the feed pipeline. Simultaneously, nitrogen gas is also introduced into catalyst feed tank 2 through the nitrogen pipeline to assist in catalyst delivery. At this time, the weighing device 6 begins to monitor the weight of the catalyst in catalyst feed tank 2 in real time to ensure accurate catalyst dosage. On the other hand, the differential pressure level gauge 5 indirectly monitors and provides real-time feedback on the liquid level change data of the catalyst in catalyst feed tank 2 by measuring the pressure difference between the bottom and top gas phase spaces of catalyst feed tank 2. This dual monitoring mechanism provides strong support for the stable operation of the system.

[0029] To further enhance the stability of the system, multiple support devices 7 effectively limit the radial displacement of the catalyst feed tank 2 during operation, ensuring the accuracy of the weighing system measurements.

[0030] In terms of safety, this application has taken careful consideration. When both the weighing data and the differential pressure data exceed the preset threshold, the stop interlock module of the delivery pump 3 will be triggered immediately, causing the delivery pump 3 to stop, thereby preventing the catalyst from continuing to enter the reactor 4 and ensuring the safe operation of the system. However, to avoid the interruption of catalyst feeding in the reactor 4 due to a single data anomaly, which would affect the stable operation of the entire system.

[0031] Therefore, this application effectively avoids the problem of catalyst feed interruption in reactor 4 due to abnormal data by using dual metering of differential pressure level gauge 5 and weighing device 6, as well as the two-to-two logic judgment mechanism of the interlocking module for stopping the transfer pump 3, thereby ensuring the stable operation of the entire system.

[0032] In this embodiment, the slurry catalyst feeding system further includes multiple receiving and discharging devices 9 and multiple limiting members 12. One end of each of the multiple supporting devices 7 is rotatably connected to the frame 1. One end of each of the multiple limiting members 12 is connected to the top surface of the frame 1, and the other end of each of the multiple limiting members 12 corresponds to the supporting device 7. The multiple limiting members 12 are located between the corresponding supporting device 7 and the weighing device 6. The top surface of the limiting member 12 has the same slope as the side of the bracket 8 facing the supporting device 7, and they are located on the same plane. One end of each of the multiple receiving and discharging devices 9 is detachably connected to the frame 1, and the other end of each of the multiple receiving and discharging devices 9 is connected to the end of the corresponding supporting device 7 away from the bracket 8.

[0033] It should be noted that two second connecting lugs are arranged parallel to each other on the top of the frame 1. Each second connecting lug has a fifth connecting hole. The bottom of the retractable device 9 has a sixth connecting hole corresponding to the fifth connecting hole. The second fastener passes through one of the fifth connecting holes, the sixth connecting hole, and the other fifth connecting hole to secure the retractable device 9 to the second connecting lugs. Specifically, after removing the second fastener, the retractable device 9 can drive the corresponding support device 7 to rotate. The limiting member 12 is used to limit the rotation angle of the support device 7 and prevent the weight of the support device 7 from directly acting on the bracket 8.

[0034] In this embodiment, the support device 7 has a groove on the side away from the corresponding bracket 8, and a plurality of first connecting holes 71 are provided along its height direction. The retractable device 9 has a second connecting hole corresponding to the first connecting hole 71 at the end facing the groove. The second connecting hole of the retractable device 9 is connected to the first connecting hole 71 of the support device 7 by a connector. This connection method is not only stable and reliable, but also convenient for disassembly and adjustment.

[0035] In this embodiment, the slurry catalyst feeding system further includes multiple height adjustment devices 11. One end of each height adjustment device 11 is mounted on the top surface of the frame 1, and the other end corresponds to a corresponding support 8. When the height adjustment device 11 is not in operation, its height is lower than the height of the weighing device 6.

[0036] It should be noted that when replacing or repairing the load cell of the weighing device 6, the support device 7 must first be removed from the frame 1. Then, the bracket 8 is raised to a suitable position using the height adjustment device 11 so that the load cell in the weighing device 6 located at the bottom of the bracket 8 can be easily removed.

[0037] In this embodiment, the slurry catalyst feeding system further includes multiple shock absorbers 10. The multiple shock absorbers 10 are respectively disposed between the top surface of the weighing device 6 and the bottom surface of the corresponding support 8.

[0038] It should be noted that the shock absorber 10 plays a role in buffering and damping, enabling the weighing device 6 to more accurately monitor the weight of the catalyst in the catalyst feed tank 2, thereby improving the reliability and accuracy of the data.

[0039] In this embodiment, both the feed pipe and the delivery pipe are flexible hoses.

[0040] It should be noted that the specifications of the hose in this application are DN25, 1.0MPa, and it is made of metal. Metal hoses can absorb and buffer vibrations and displacements in the pipeline system.

[0041] In this embodiment, the top surface of the frame 1 is provided with a receiving groove for accommodating multiple weighing sensors of the weighing device 6.

[0042] It should be noted that the receiving groove prevents the load cell from shifting.

[0043] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0044] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A feeding system for a slurry catalyst, characterized in that, It includes a frame (1), a catalyst feed tank (2), a transfer pump (3), a reactor (4), a differential pressure level gauge (5), a weighing device (6), multiple support devices (7) and multiple brackets (8); The catalyst feed tank (2) is vertically installed through the frame (1), and multiple supports (8) are fixedly connected to its outer wall in a circumferential direction. The longitudinal section of the support (8) is a triangular structure. The weighing device (6) is installed between the bracket (8) and the frame (1), and the multiple weighing sensors of the weighing device (6) correspond to the bracket (8). The weighing device (6) is used to weigh the weight of the catalyst in the catalyst feed tank (2) in real time. The high-pressure side input terminal of the differential pressure level gauge (5) is connected to the bottom of the catalyst feed tank (2), and its low-pressure side input terminal is connected to the top gas phase space of the catalyst feed tank (2). The stop interlock module of the delivery pump (3) is connected to the output end of the weighing device (6) and the output end of the differential pressure level gauge (5) respectively. When the weighing data and differential pressure data both exceed the preset threshold, the delivery pump (3) is triggered to stop. One end of each of the multiple support devices (7) is detachably connected to the frame (1), and the other end abuts against the side of the corresponding bracket (8) away from the catalyst feed tank (2) to limit the radial displacement of the catalyst feed tank (2); The first input end of the catalyst feed tank (2) is connected to the catalyst raw material through the feed pipeline, the second input end is connected to the nitrogen source through the nitrogen pipeline, and the output end is connected to the inlet of the delivery pump (3) through the delivery pipeline. The outlet of the delivery pump (3) is connected to the reactor (4).

2. The slurry catalyst feeding system according to claim 1, characterized in that, It also includes multiple take-up and take-down devices (9) and multiple limiting members (12); One end of each of the multiple support devices (7) is rotatably connected to the frame (1); One end of each of the plurality of limiting members (12) is connected to the top surface of the frame (1), and the other end of each of them corresponds to the support device (7). The plurality of limiting members (12) are located between the corresponding support device (7) and the weighing device (6). The top surface of the limiting member (12) has the same inclination as the side of the bracket (8) facing the support device (7) and is located on the same plane. The limiting member (12) is used to limit the rotation angle of the support device (7). One end of each of the multiple take-up and take-down devices (9) is detachably connected to the frame (1), and the other end of each is connected to the side of the corresponding support device (7) away from the bracket (8).

3. The slurry catalyst feeding system according to claim 2, characterized in that, The support device (7) has a groove on the side away from the corresponding bracket (8) and a plurality of first connecting holes (71) are provided along its height direction; The receiving and releasing device (9) has a second connecting hole corresponding to the first connecting hole (71) at one end facing the groove.

4. The slurry catalyst feeding system according to claim 1, characterized in that, It also includes multiple height adjustment devices (11); One end of each of the multiple height adjustment devices (11) is mounted on the top surface of the frame (1), and the other end of each corresponds to the corresponding bracket (8); When the height adjustment device (11) is not working, its height is lower than that of the weighing device (6).

5. The feeding system for the slurry catalyst according to claim 1, characterized in that, It also includes multiple shock absorbers (10); Multiple shock absorbers (10) are respectively disposed between the top surface of the weighing device (6) and the bottom surface of the corresponding support (8).

6. The slurry catalyst feeding system according to claim 1, characterized in that, Both the feed pipe and the delivery pipe are flexible hoses.

7. The slurry catalyst feeding system according to claim 1, characterized in that, The top surface of the frame (1) is provided with a receiving groove for accommodating multiple weighing sensors of the weighing device (6).

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