Liquefied hydrocarbon supply system based on backup pump interlock control

Abstract

The utility model belongs to the supply system technical field of liquefied hydrocarbon raw material, concretely relates to the liquefied hydrocarbon feed system based on standby pump interlock control, the liquefied hydrocarbon feed system based on standby pump interlock control described in the utility model, include: liquefied hydrocarbon storage tank group, at least one group of liquefied hydrocarbon feed pump group, feed pipeline, pressure detection device and control system, the liquefied hydrocarbon storage tank group includes at least one liquefied hydrocarbon storage tank A, the liquefied hydrocarbon feed pump group includes one liquefied hydrocarbon pump A and at least one liquefied hydrocarbon pump B, and the outlet is connected to the cold discharge tank, the pressure detection device is set up on the feed pipeline, and the liquefied hydrocarbon feed pump group is connected with the pressure remote transmission interlock on the feed pipeline, the liquefied hydrocarbon feed system based on standby pump interlock control provided in the utility model can guarantee the safety, continuous, steady of liquefied hydrocarbon feed, and can effectively reduce the liquefied hydrocarbon storage capacity in production device area, reduce the safety risk and investment cost.

Description

Technical Field

[0001] This utility model belongs to the technical field of liquefied hydrocarbon feedstock supply systems, specifically relating to a liquefied hydrocarbon supply system based on standby pump interlock control. Background Technology

[0002] In petrochemical and coal chemical production fields, liquefied hydrocarbons (such as liquefied hydrocarbons and liquefied petroleum gas) are important raw materials. Currently, similar liquefied hydrocarbon production units generally use pumping for feeding. To prevent feed interruptions caused by malfunctions (such as failures or tripping) of the liquefied hydrocarbon feed pumps, which could severely affect the stable operation of the production unit, the conventional design solution is to install a large liquefied hydrocarbon storage tank within the production unit's boundary. This buffer tank is typically required to store the amount of liquefied hydrocarbons needed for 4-6 hours of production, providing sufficient time for maintenance or switching off a faulty pump.

[0003] However, this approach has significant drawbacks: First, storing large quantities of liquefied hydrocarbons within the production unit directly leads to a substantial increase in the amount of hazardous chemicals stored within the unit area, often raising the overall major hazard level of the entire facility. This increase in major hazard level necessitates corresponding increases in the safety design level of the production unit, the explosion-proof rating of equipment and instruments, and safety distances (such as fire separation distances from surrounding facilities). This not only increases the complexity and risk of safety management but also directly leads to a significant increase in project construction investment and reduces land utilization. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned defects in the existing technology and provide a liquefied hydrocarbon supply system based on the interlock control of the backup pump, which can not only ensure the safe, continuous and stable supply of liquefied hydrocarbons, but also effectively reduce the amount of liquefied hydrocarbons stored in the production unit area, reduce safety risks and investment costs.

[0005] The liquefied hydrocarbon supply system based on standby pump interlock control described in this utility model includes: a liquefied hydrocarbon storage tank group, at least one liquefied hydrocarbon supply pump group, a supply pipeline, a pressure detection device, and a control system; The liquefied hydrocarbon storage tank group includes at least one liquefied hydrocarbon storage tank A; The liquefied hydrocarbon feed pump group includes one liquefied hydrocarbon pump A and at least one liquefied hydrocarbon pump B. The inlets of both pumps A and B are connected to the liquefied hydrocarbon storage tank group via system feed pipelines, and their outlets are connected to a cold discharge tank. A pressure detection device is installed on the feed pipeline to detect pipeline pressure in real time and generate a pressure signal. The liquefied hydrocarbon feed pump group is interlocked with the pressure transmission on the feed pipeline. The control system is connected to the pressure detection device, liquefied hydrocarbon pump A, liquefied hydrocarbon pump B, and the outlet valve on the pipeline, and is programmed to control the opening and closing of liquefied hydrocarbon pump A, liquefied hydrocarbon pump B, and the valves based on the pressure signal. Specifically, the control system is configured to: when the pressure in the feed pipeline is lower than a first preset pressure value, perform the following interlocking actions in sequence: a. Start liquefied hydrocarbon pump B and open its outlet valve; b. Close the outlet valve of liquefied hydrocarbon pump A and stop liquefied hydrocarbon pump A. The pressure detection device is a pressure transmitter.

[0006] The pipeline between the liquefied hydrocarbon storage tank group and the liquefied hydrocarbon feed pump group is also equipped with liquefied hydrocarbon water separators A, B, and C. The pipeline between the liquefied hydrocarbon storage tank group and the liquefied hydrocarbon feed pump group is also equipped with liquefied hydrocarbon booster A, B, and C.

[0007] The liquefied hydrocarbon booster A, liquefied hydrocarbon booster B, and liquefied hydrocarbon booster C are all connected to steam pipelines and condensate pipelines.

[0008] The system also includes a liquefied hydrocarbon compression and unloading station, which is connected to the liquefied hydrocarbon storage tank group via pipelines. The system also includes nitrogen pipelines.

[0009] The liquefied hydrocarbon water separator A is equipped with a hot water inlet pipe, a hot water return pipe, and a sewage discharge pipe.

[0010] The liquefied hydrocarbon storage tank group also includes liquefied hydrocarbon storage tank B and liquefied hydrocarbon storage tank C, and each of liquefied hydrocarbon storage tank A, liquefied hydrocarbon storage tank B and liquefied hydrocarbon storage tank C is provided with a pipeline connected to the feed pipeline and the system feed pipeline.

[0011] A reflux pipe and a gas phase balance line are installed between the liquefied hydrocarbon storage tank group and the liquefied hydrocarbon feed pump group.

[0012] The inlet pipe of the cold discharge tank is connected to a liquefied hydrocarbon purification pipe, and the liquefied hydrocarbon supply pump group is equipped with a liquefied hydrocarbon purification device pipe.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This invention implements a standby interlock for liquefied hydrocarbon feed pumps, effectively ensuring stable feed supply by automatically starting the standby pump in case of pump failure or abnormality. It also eliminates the need for buffer tanks in production units, reducing the amount of hazardous chemicals stored in production units and lowering the assessment level of major hazard sources. Furthermore, it reduces investment in production unit construction, the level of supporting instruments, and safety distance requirements, thereby improving land utilization. Through automated control, it reduces manual operation and improves system reliability and safety. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the liquefied hydrocarbon feeding system based on the interlock control of the standby pump according to this utility model.

[0015] Figure 2 This is a logic diagram of the DCS interlocking system; Figure 3 This is a schematic diagram of the SIS interlocking system.

[0016] In the diagram: 1. Cold discharge tank; 2. Liquefied hydrocarbon storage tank A; 3. Liquefied hydrocarbon water separator A; 4. Liquefied hydrocarbon booster A; 5. Liquefied hydrocarbon water separator B; 6. Liquefied hydrocarbon storage tank B; 7. Liquefied hydrocarbon booster B; 8. Liquefied hydrocarbon water separator C; 9. Liquefied hydrocarbon storage tank C; 10. Liquefied hydrocarbon booster C; 11. Liquefied hydrocarbon pump A; 12. Liquefied hydrocarbon pump B; 13. Hot water supply pipe; 14. Sewage discharge pipe; 15. Hot water return pipe; 16. Nitrogen pipeline; 17. Feed pipeline; 18. Steam pipeline; 19. Condensate pipeline; 20. System feed pipeline; 21. Return pipe; 22. Gas phase balance line; 23. Liquefied hydrocarbon compression unloading station; 24. Liquefied hydrocarbon purification pipeline; 25. Pipeline to liquefied hydrocarbon purification unit. Detailed Implementation

[0017] The present invention will be further described below with reference to specific embodiments.

[0018] like Figure 1 As shown, the liquefied hydrocarbon feeding system based on standby pump interlock control of this utility model mainly includes a liquefied hydrocarbon storage tank group, a liquefied hydrocarbon feeding pump group, a feeding pipeline 17, a pressure detection device, and a control system.

[0019] Taking propylene as an example, the logic diagram of the DCS interlocking system is as follows: Figure 2 As shown. Figure 2 P-1811A and B correspond to respectively Figure 1 The liquefied hydrocarbon pumps A11 and B12 are shown in the diagram. The SIS interlocking system logic diagram is as follows: Figure 3 As shown. Figure 3 P-1811A and B in the text correspond to respectively Figure 1 The liquefied hydrocarbon pumps A11 and B12 are included. Figure 3P-1811C is an extension that can be connected in parallel to a liquefied hydrocarbon pump. The propylene storage tank V-1811A corresponds to levels LZT-18101A, B, and C. Figure 1 The liquefied hydrocarbon storage tanks A2, B6, and C9, and the remaining propylene storage tanks V-1811A, LZT-18101D, E, and F are synchronously expanded tanks, as those skilled in the art will understand.

[0020] The liquefied hydrocarbon storage tank group includes liquefied hydrocarbon storage tanks A2, B6, and C9, used for storing liquefied hydrocarbon materials. The liquefied hydrocarbon feed pump group includes liquefied hydrocarbon pump A11 and pump B12, with pump A11 serving as the main operating pump and pump B12 as the standby pump. The inlets of both pumps are connected to the liquefied hydrocarbon storage tank group via system feed pipeline 20, and their outlets are connected to cold discharge tank 1.

[0021] Liquefied hydrocarbon water separators A3, B5, and C8 are installed on the pipeline between the liquefied hydrocarbon storage tank group and the liquefied hydrocarbon feed pump group to separate water from the liquefied hydrocarbons. Liquefied hydrocarbon water separator A3 is equipped with a hot water inlet pipe 13, a hot water return pipe 15, and a wastewater discharge pipe 14. Hot water circulation maintains the tank temperature and promotes oil-water separation.

[0022] The pipeline between the liquefied hydrocarbon storage tank group and the liquefied hydrocarbon feed pump group is also equipped with liquefied hydrocarbon booster A4, liquefied hydrocarbon booster B7 and liquefied hydrocarbon booster C10. These boosters are connected to steam pipeline 18 and condensate pipeline 19, and the system pressure is maintained stable by steam heating.

[0023] The system also includes a liquefied hydrocarbon compression unloading station 23, which is connected to the liquefied hydrocarbon storage tank group via pipelines to receive external liquefied hydrocarbon materials. A nitrogen pipeline 16 is used for system purging and inerting protection. A return pipe 21 and a gas phase balance line 22 are installed between the liquefied hydrocarbon storage tank group and the liquefied hydrocarbon feed pump group to maintain system pressure and flow balance.

[0024] The inlet pipe of the cold discharge tank 1 is connected to a liquefied hydrocarbon purification pipe 24 for the final purification treatment of the material. The liquefied hydrocarbon feed pump set is equipped with a liquefied hydrocarbon purification device pipe 25, which can send part of the material to the purification device for circulation treatment.

[0025] A pressure detection device is installed on the feed pipeline 17 to monitor the pipeline pressure in real time. The control system is connected to the pressure detection device, liquefied hydrocarbon pump A11, liquefied hydrocarbon pump B12, and the outlet valve on the pipeline. The control system is programmed to control the opening and closing of the pumps and valves based on the pressure signal.

[0026] The working process of this utility model is as follows: First, liquefied hydrocarbon material is filled into the liquefied hydrocarbon storage tank group (storage tanks A2, B6, and C9) through the liquefied hydrocarbon compression unloading station 23. The nitrogen pipeline 16 is opened to purge and replace the system, ensuring that the oxygen content in the system reaches the safety standard. The liquefied hydrocarbon flows out from the storage tank group through the system feed pipeline 20, sequentially passing through the liquefied hydrocarbon water separators (3, 5, and 8) for moisture separation. The system pressure is maintained by the liquefied hydrocarbon booster (4, 7, and 10), and finally enters the liquefied hydrocarbon feed pump group. At this time, the liquefied hydrocarbon pump A11 operates normally as the main pump, transporting the material through the feed pipeline 17 to the cold discharge tank 1, and then supplying it to the downstream production unit. The pressure detection device monitors the pressure changes in the feed pipeline 17 in real time. If the standby pump is a variable frequency pump, the control system will gradually increase its operating power until the pressure in the feed pipeline returns to the normal range, achieving a smooth switch and ensuring uninterrupted supply. The water separator maintains a suitable temperature through the hot water inlet pipe 13 and the hot water return pipe 15 to promote oil-water separation. The separated water is discharged periodically through the sewage discharge pipe 14. The booster maintains stable system pressure through the steam pipe 18 and the condensate pipe 19. The return pipe 21 and the gas phase balance line 22 maintain the pressure and flow balance between the storage tank and the pump group. The liquefied hydrocarbon purification pipe 24 and the de-liquefied hydrocarbon purification device pipe 25 can purify the material according to the purity requirements of the material.

[0027] This invention significantly improves material supply reliability and avoids production interruptions due to pump failure through automatic interlock control of the backup pump. Simultaneously, due to the system's inherent stability and emergency response capabilities, the buffer tank before the production unit in traditional designs can be eliminated, thereby reducing the level of major hazard sources, saving land and construction costs, and improving overall economic efficiency and safety.

Claims

1. A liquefied hydrocarbon feeding system based on standby pump interlock control, characterized in that, include: The liquefied hydrocarbon storage tank group, at least one liquefied hydrocarbon feed pump group, feed pipeline (17), pressure detection device and control system; The liquefied hydrocarbon storage tank group includes at least one liquefied hydrocarbon storage tank A (2). The liquefied hydrocarbon feed pump group includes one liquefied hydrocarbon pump A (11) and at least one liquefied hydrocarbon pump B (12). The inlets of the liquefied hydrocarbon pump A (11) and the liquefied hydrocarbon pump B (12) are connected to the liquefied hydrocarbon storage tank group through the system feed pipeline (20), and the outlets are connected to the cold discharge tank (1). The pressure detection device is installed on the feed pipeline (17). The liquefied hydrocarbon feed pump group is interlocked with the pressure remote transmission on the feed pipeline (17). The control system is connected to the pressure detection device, the liquefied hydrocarbon pump A (11), the liquefied hydrocarbon pump B (12), and the outlet valve on the pipeline, and is programmed to control the opening and closing of the liquefied hydrocarbon pump A (11), the liquefied hydrocarbon pump B (12), and the valve according to the pressure signal.

2. The liquefied hydrocarbon feeding system based on standby pump interlock control according to claim 1, characterized in that: A liquefied hydrocarbon water separator A (3), a liquefied hydrocarbon water separator B (5), and a liquefied hydrocarbon water separator C (8) are also installed on the pipeline between the liquefied hydrocarbon storage tank group and the liquefied hydrocarbon feed pump group.

3. The liquefied hydrocarbon feeding system based on standby pump interlock control according to claim 2, characterized in that: A liquefied hydrocarbon booster A (4), a liquefied hydrocarbon booster B (7), and a liquefied hydrocarbon booster C (10) are also installed on the pipeline between the liquefied hydrocarbon storage tank group and the liquefied hydrocarbon feed pump group.

4. The liquefied hydrocarbon feeding system based on standby pump interlock control according to claim 3, characterized in that: The liquefied hydrocarbon booster A (4), liquefied hydrocarbon booster B (7), and liquefied hydrocarbon booster C (10) are all connected to a steam pipeline (18) and a condensate pipeline (19).

5. The liquefied hydrocarbon feeding system based on standby pump interlock control according to claim 1, characterized in that: The system also includes a liquefied hydrocarbon compression unloading station (23), which is connected to the liquefied hydrocarbon storage tank group via pipelines.

6. The liquefied hydrocarbon feeding system based on standby pump interlock control according to claim 1, characterized in that: The system also includes a nitrogen pipeline (16).

7. The liquefied hydrocarbon feeding system based on standby pump interlock control according to claim 2, characterized in that: The liquefied hydrocarbon water separator A (3) is equipped with a hot water inlet pipe (13), a hot water return pipe (15), and a sewage discharge pipe (14).

8. The liquefied hydrocarbon feeding system based on standby pump interlock control according to claim 1, characterized in that: The liquefied hydrocarbon storage tank group also includes liquefied hydrocarbon storage tank B (6) and liquefied hydrocarbon storage tank C (9), and each of liquefied hydrocarbon storage tank A (2), liquefied hydrocarbon storage tank B (6) and liquefied hydrocarbon storage tank C (9) is provided with a pipeline connected to the feed pipeline (17) and the system feed pipeline (20).

9. The liquefied hydrocarbon feeding system based on standby pump interlock control according to claim 1, characterized in that: A return pipe (21) and a gas phase balance line (22) are provided between the liquefied hydrocarbon storage tank group and the liquefied hydrocarbon feed pump group.

10. The liquefied hydrocarbon feeding system based on standby pump interlock control according to claim 9, characterized in that: The inlet pipe of the cold discharge tank (1) is connected to a liquefied hydrocarbon purification pipe (24), and the liquefied hydrocarbon supply pump group is equipped with a liquefied hydrocarbon purification device pipe (25).

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