An online crude oil blending system

Abstract

The application discloses an online crude oil blending system, which comprises a first pump group, a second pump group, a first blending assembly, a second blending assembly, four groups of merging assemblies, four-way tank group pouring-in-pump lines and four-way tank group feeding-in-pump lines; the first pump group is composed of P207 and P208 pumps which are used as backup to each other; the second pump group is composed of P205 and P206 pumps which are used as backup to each other; pump group outlet pipelines are connected with the four-way tank group pouring-in-pump lines; the first and second blending assemblies are connected with corresponding pump groups respectively; the output ends of the two are connected with the merging assemblies after being merged; the four groups of merging assemblies are connected with the four-way tank group feeding-in-pump lines one by one; the online blending through pipelines replaces the traditional tank pouring mixing, realizes accurate proportional blending of small variety crude oil, guarantees uniform crude oil density, reduces fluctuation of atmospheric and vacuum distillation units, reduces power consumption of pumps, breaks through the blending quantity limit of small variety crude oil for domestic trade, adapts to feeding requirements of multiple atmospheric and vacuum distillation units and has remarkable economic benefits.

Description

Technical Field

[0001] This invention relates to the field of crude oil processing and blending technology, specifically to an online crude oil blending system, which is suitable for the online proportional blending of small-variety crude oil from crude oil tank farms to multiple atmospheric and vacuum distillation units, thereby achieving continuous and stable supply of crude oil to the atmospheric and vacuum distillation units. Background Technology

[0002] The crude oil tank farm routinely stores unloaded specialty crude oil and blended crude oil transported from the Mamu oil depot via subsea pipeline. In the current process, when the feed tank receives blended crude oil from the Mamu oil depot, the specialty crude oil is transferred to the feed tank via a transfer pump. After preparation, it is mixed using a self-circulating transfer line before being supplied to the atmospheric and vacuum distillation unit. This transfer blending method has several drawbacks: First, it easily leads to uneven crude oil density in the feed tank, causing fluctuations in unit operation and affecting processing stability after delivery to the atmospheric and vacuum distillation unit. Second, blending requires the transfer line to be occupied for transfer and self-circulation, resulting in high energy consumption due to continuous pump operation. Third, some feed tanks cannot be blended or have reduced blending ratios due to the blending process, leading to discontinuous crude oil properties received by the same atmospheric and vacuum distillation unit. It also limits the blending volume of domestic specialty crude oil, making it difficult to meet the company's continuously growing demand for domestic specialty crude oil processing.

[0003] To address the aforementioned issues, there is an urgent need to develop an online crude oil blending system that can enable online blending of minor crude oil varieties through technological upgrades, thereby optimizing the crude oil blending process. Summary of the Invention

[0004] The purpose of this invention is to overcome the technical problems of uneven density, high energy consumption, equipment fluctuation and limited blending volume of small varieties in the existing crude oil transfer blending method, and to provide an online crude oil blending system.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: This invention discloses an online crude oil blending system, comprising a first pump group, a second pump group, a first blending component, a second blending component, a merging component, a four-way tank group transfer pump line, and a four-way tank group feeding pump line; the first pump group includes independent P207 pumps and P208 pumps, which are backups for each other, and the second pump group includes independent P205 pumps and P206 pumps, which are backups for each other; the outlet pipelines of different pumps on the first pump group and the second pump group are respectively connected to different tank group transfer pump lines; The first blending component is connected to the first pump group, and the second blending component is connected to the second pump group. The output ends of the first blending component and the second blending component merge and are connected to the merging component. Four merging components are set up, and the four merging components are respectively connected to the four tank group feed pump lines, so as to realize the online blending of small-variety crude oil into the four tank group feed pump lines.

[0006] Preferably, the first blending assembly includes a first pipeline, a second pipeline, and a first blending manifold. The outlet end of pump P207 is connected to the first pipeline, and the outlet end of pump P208 is connected to the second pipeline. The output ends of both the first and second pipelines are connected to the first blending manifold. A first gate valve, a first flow meter, and a first flow control valve group are sequentially connected in series on the first blending manifold.

[0007] Preferably, the second blending assembly includes a No. 3 pipeline, a No. 4 pipeline, and a second blending manifold. The outlet end of the P205 pump is connected to the No. 3 pipeline, and the outlet end of the P206 pump is connected to the No. 4 pipeline. The output ends of the No. 3 and No. 4 pipelines are both connected to the second blending manifold. A second gate valve, a second flow meter, and a second flow control valve group are sequentially connected in series on the second blending manifold.

[0008] Preferably, the four tank group transfer pump lines are: tank group #1 transfer pump line, tank group #2 transfer pump line, tank group #3 transfer pump line, and tank group #4 transfer pump line. The inlet pipelines of pumps P207 and P208 are connected to the inlet pump line of tank group #1 and tank group #3, respectively; the outlet pipelines of pumps P207 and P208 are also connected to the inlet return line of tank group #1 and tank group #3, respectively; the inlet pipelines of pumps P206 and P205 are connected to the inlet pump line of tank group #4 and tank group #2, respectively; the outlet pipelines of pumps P207 and P208 are also connected to the inlet return line of tank group #4 and tank group #2, respectively.

[0009] Preferably, each of the merging components includes a one-way valve and a third gate valve. After the output ends of the first blending component and the second blending component merge, they are connected in series with the one-way valve and the third gate valve in sequence, and then connected to the corresponding tank group feed pump line after passing through the one-way valve and the third gate valve.

[0010] Preferably, the first blending manifold and the second blending manifold are each provided with four sub-pipelines. Each sub-pipeline of the first blending manifold is connected to a first gate valve, a first flow meter and a first flow control valve group; each sub-pipeline of the second blending manifold is connected to a second gate valve, a second flow meter and a second flow control valve group. The sub-pipes on the first blending manifold and the sub-pipes on the second blending manifold are connected one-to-one and then connected to a group of the merging components.

[0011] Preferably, both the first flow control valve group and the second flow control valve group can reduce the pressure of the transported crude oil to the inlet pressure of the feed pump ≤0.2MPa, thereby achieving matching with the inlet pressure of the crude oil feed pump.

[0012] Preferably, the first flow meter is used to measure the flow rate of the minor crude oil transported through the first blending manifold, and the first flow control valve group can accurately adjust the amount of minor crude oil blended into the pump line of the four tank groups according to the measurement result of the first flow meter.

[0013] Preferably, the second flow meter is used to measure the flow rate of the minor crude oil transported through the second blending manifold, and the second flow control valve group can accurately adjust the amount of minor crude oil blended into the pump line of the four tank group according to the measurement result of the second flow meter.

[0014] Beneficial Effects: The pump units adopt an independent and mutually redundant structural design, ensuring continuous operation of the system's blending process and avoiding blending interruptions due to single pump failure. The blending manifold has four sub-pipelines, each corresponding to a merging component, adapting to the synchronous blending needs of four tank group feed pump lines, achieving independent and precise blending across multiple lines. The blending component connects a flow meter and a flow control valve assembly in series. The flow meter provides precise measurement, while the flow control valve assembly adjusts as needed, enabling precise control of the blending volume of small-variety crude oil. The flow control valve assembly can reduce the crude oil pressure to the feed pump inlet pressure, facilitating precise matching between the blended crude oil and the feed pump inlet pressure, adapting to the pressure requirements of the feed system. The merging component is equipped with a check valve and a gate valve. The check valve prevents crude oil backflow from affecting the blending ratio, while the gate valve can independently control the on / off of each blending line, improving the system's operational and maintenance flexibility. The system relies on the existing tank group transfer pump lines and return lines for modification. The new pipelines do not interfere with the existing pipelines, making full use of existing equipment and simplifying the modification structure. Attached Figure Description

[0015] Figure 1 This is a block diagram illustrating the principle of the present invention. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] This invention aims to achieve proportional online blending of minor crude oil products into multiple atmospheric and vacuum distillation units through the modification and design of online pipeline blending. This ensures uniform density of crude oil delivered to the atmospheric and vacuum distillation units, improves the operational stability of the units, reduces production energy consumption, increases blending speed, breaks through the limitation of blending volume of minor crude oil products in the domestic market, and maximizes company profits.

[0018] Summary / Principle of the Invention: The crude oil online blending system provided by this invention includes a first pump group, a second pump group, a first blending component, a second blending component, a merging component, a four-way tank group transfer pump line, and a four-way tank group feeding pump line; wherein the first pump group includes P207 pump and P208 pump, which are independent of each other and serve as backups for each other, and the second pump group includes P205 pump and P206 pump, which are independent of each other and serve as backups for each other, and the outlet pipelines of different pumps on the first pump group and the second pump group are respectively connected to the tank group transfer pump lines on different routes.

[0019] The first blending component is connected to the first pump group, and the second blending component is connected to the second pump group. The output ends of the first blending component and the second blending component merge and are connected to the merging component. Four merging components are set up accordingly, and the four merging components are connected to the four tank group feed pump lines one by one, so as to realize the online blending of small-variety crude oil into the four tank group feed pump lines.

[0020] The first blending assembly includes a first pipeline 11, a second pipeline 12, and a first blending manifold 9. The outlet end of pump P207 is connected to the first pipeline 11, and the outlet end of pump P208 is connected to the second pipeline 12. The output ends of both the first pipeline 11 and the second pipeline 12 are connected to the first blending manifold 9. A first gate valve 1, a first flow meter 2, and a first flow control valve group 3 are sequentially connected in series on the first blending manifold 9.

[0021] The second blending assembly includes pipeline 13 (number 3), pipeline 14 (number 4), and a second blending manifold 10. The outlet of pump P205 is connected to pipeline 13 (number 3), and the outlet of pump P206 is connected to pipeline 14 (number 4). The outputs of pipelines 13 (number 3) and 14 (number 4) are both connected to the second blending manifold 10. A second gate valve 4, a second flow meter 5, and a second flow control valve group 6 are sequentially connected in series on the second blending manifold 10.

[0022] The four tank group transfer pump lines are: No. 1 tank group transfer pump line, No. 2 tank group transfer pump line, No. 3 tank group transfer pump line, and No. 4 tank group transfer pump line. The inlet pipelines of pumps P207 and P208 are connected to the No. 1 tank group transfer pump line and the No. 3 tank group transfer pump line, respectively, and their outlet pipelines are also connected to the No. 1 tank group transfer return line and the No. 3 tank group transfer return line, respectively. The inlet pipelines of pumps P206 and P205 are connected to the No. 4 tank group transfer pump line and the No. 2 tank group transfer pump line, respectively, and their outlet pipelines are also connected to the No. 4 tank group transfer return line and the No. 2 tank group transfer return line, respectively.

[0023] Each set of assembly components includes a one-way valve 7 and a third gate valve 8. After the output ends of the first blending component and the second blending component merge, they are connected in series with the one-way valve 7 and the third gate valve 8 in sequence, and then connected to the corresponding tank group feed pump line after passing through the one-way valve 7 and the third gate valve 8. The first blending manifold 9 and the second blending manifold 10 are each provided with four sub-pipelines. Each sub-pipeline of the first blending manifold 9 is connected to a first gate valve 1, a first flow meter 2 and a first flow control valve group 3. Each sub-pipeline of the second blending manifold 10 is connected to a second gate valve 4, a second flow meter 5 and a second flow control valve group 6. After the sub-pipelines on the first blending manifold 9 and the sub-pipelines on the second blending manifold 10 are connected one-to-one, they are connected to a set of assembly components.

[0024] Both the first flow control valve group 3 and the second flow control valve group 6 can reduce the pressure of the transported crude oil of a certain type to the inlet pressure of the feed pump, preferably controlled at ≤0.2MPa, to achieve matching with the inlet pressure of the crude oil feed pump; the first flow meter 2 is used to measure the flow rate of the crude oil of a certain type transported through the first blending manifold 9, and the first flow control valve group 3 can accurately adjust the blending amount according to the measurement result of the first flow meter 2; the second flow meter 5 is used to measure the flow rate of the crude oil of a certain type transported through the second blending manifold 10, and the second flow control valve group 6 can accurately adjust the blending amount according to the measurement result of the second flow meter 5.

[0025] This invention eliminates the traditional tank transfer and self-circulation mixing methods. It relies on the existing tank farm pump sets, tank transfer pump lines and return lines for modification, and realizes online blending of small-variety crude oil and feed crude oil directly through pipelines. This ensures uniform crude oil density from the source, while reducing the power consumption of pumps running ineffectively, improving blending efficiency, and meeting the growing demand for domestic small-variety crude oil processing.

[0026] Example 1: The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] The first pump set of this invention consists of pumps P207 and P208, which are independent and serve as backups for each other. The second pump set consists of pumps P205 and P206, which are independent and serve as backups for each other. The four-way tank group transfer pump lines are: tank group #1 transfer pump line, tank group #2 transfer pump line, tank group #3 transfer pump line, and tank group #4 transfer pump line. The inlet pipelines of pumps P207 and P208 are respectively connected to the tank group #1 transfer pump line and the tank group #3 transfer pump line. The inlet pipelines of the two pump groups are connected to the inlet pipelines of tank group #1 and tank group #3, respectively; the inlet pipelines of pumps P206 and P205 are connected to the inlet pipelines of tank group #4 and tank group #2, respectively, and their outlet pipelines are connected to the inlet pipelines of tank group #4 and tank group #2, respectively. The outlet pipelines of different pumps on the first and second pump groups are connected to the inlet pipelines of different tank groups. A new pipeline 11 is added to the outlet of pump P207, and a new pipeline 12 is added to the outlet of pump P208. The output ends of pipelines 11 and 12 are connected to the first blending manifold 9. The first blending manifold 9 has four sub-pipelines, and each sub-pipeline is equipped with a first gate valve 1, a first flow meter 2, and a first flow control valve group 3 in sequence, forming a complete first blending assembly. A new pipeline 13 is added to the outlet of pump P205, and a new pipeline 14 is added to the outlet of pump P206. The output ends of pipelines 13 and 14 are connected to the second blending manifold 10. The second blending manifold 10 also has four sub-pipelines, and each sub-pipeline is equipped with a second gate valve 4, a second flow meter 5, and a second flow control valve group 6 in sequence, forming a complete second blending assembly.

[0028] The four sub-pipelines of the first blending manifold 9 are connected one-to-one with the four sub-pipelines of the second blending manifold 10. After each set of connected sub-pipelines merges, they are connected to a set of merging components consisting of a check valve 7 and a third gate valve 8. That is, four sets of merging components are set up accordingly. Each set of merging components is a series structure with the check valve 7 in front and the third gate valve 8 behind. After passing through the check valve 7 and the third gate valve 8, it is connected one-to-one with the feed pump line of tank group 1#, 2#, 3# and 4#, respectively, so as to realize the online blending of small-variety crude oil into the four tank groups and into the pump line.

[0029] Both the first flow control valve group 3 and the second flow control valve group 6 can reduce the pressure of the transported crude oil of a certain type to ≤0.2MPa at the inlet pressure of the feed pump, ensuring that the pressure of the crude oil of a certain type matches the inlet pressure of the crude oil feed pump; the first flow meter 2 measures the flow rate of the crude oil of a certain type transported through the first blending manifold 9 in real time, and the first flow control valve group 3 precisely adjusts the blending amount according to the measurement result of the first flow meter 2; the second flow meter 5 measures the flow rate of the crude oil of a certain type transported through the second blending manifold 10 in real time, and the second flow control valve group 6 precisely adjusts the blending amount according to the measurement result of the second flow meter 5.

[0030] In actual production, when the four tank groups supply crude oil to the four atmospheric and vacuum distillation units, the operators can determine the blending ratio of the minor crude oil according to production needs and start the corresponding P207, P208, P205, or P206 pumps. The minor crude oil enters the corresponding pump body through the tank group transfer pump line, and then is transported to the first blending manifold 9 or the second blending manifold 10 via pipeline 11, pipeline 12, or pipeline 13, or pipeline 14. After the flow rate of the minor crude oil is measured by the flow meter on the sub-pipeline of the blending manifold, the flow control valve group accurately adjusts the blending amount according to the measurement result and reduces the pressure to ≤0.2MPa to complete the pressure matching. After adjustment, the minor crude oil merges through the corresponding sub-pipelines of the first and second blending manifolds and enters the merging assembly composed of check valve 7 and third gate valve 8. Finally, it is directly blended into the crude oil in the corresponding tank group supply pump line and transported to the atmospheric and vacuum distillation unit along with the supplied crude oil, realizing online blending throughout the entire process.

[0031] In this embodiment, the pump sets are designed to be independent of each other and serve as backups for each other, ensuring the continuity of system operation. Even if one pump fails, the other backup pump can be put into use immediately, avoiding interruption in the blending process. The one-way valve 7 can effectively prevent crude oil supplied from the tank into the pump line from flowing back into the blending pipeline, avoiding affecting the blending ratio and normal operation of the pump set. Each gate valve can flexibly control the opening and closing of the corresponding pipeline according to production needs, facilitating pipeline maintenance and flexible adjustment of the blending process, further improving the safety and flexibility of system operation.

[0032] Finally, it should be noted that the present invention is not limited to the above embodiments, and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of the present invention should be considered within the scope of protection of the present invention.

Claims

1. An online crude oil blending system, characterized in that, It includes a first pump group, a second pump group, a first blending component, a second blending component, a merging component, a four-way tank group transfer pump line, and a four-way tank group feeding pump line; the first pump group includes independent P207 pump and P208 pump, which are backups for each other, and the second pump group includes independent P205 pump and P206 pump, which are backups for each other, and the outlet pipelines of different pumps on the first pump group and the second pump group are respectively connected to different tank group transfer pump lines; The first blending component is connected to the first pump group, and the second blending component is connected to the second pump group. The output ends of the first blending component and the second blending component merge and are connected to the merging component. Four merging components are set up, and the four merging components are respectively connected to the four tank group feed pump lines, so as to realize the online blending of small-variety crude oil into the four tank group feed pump lines.

2. The online crude oil blending system according to claim 1, characterized in that, The first blending assembly includes a first pipeline (11), a second pipeline (12), and a first blending manifold (9). The outlet end of pump P207 is connected to the first pipeline (11), and the outlet end of pump P208 is connected to the second pipeline (12). The output ends of the first pipeline (11) and the second pipeline (12) are both connected to the first blending manifold (9). A first gate valve (1), a first flow meter (2), and a first flow control valve group (3) are sequentially connected in series on the first blending manifold (9).

3. The online crude oil blending system according to claim 2, characterized in that, The second blending assembly includes pipeline No. 3 (13), pipeline No. 4 (14) and the second blending manifold (10). The outlet end of pump P205 is connected to pipeline No. 3 (13), and the outlet end of pump P206 is connected to pipeline No. 4 (14). The output ends of pipeline No. 3 (13) and pipeline No. 4 (14) are connected to the second blending manifold (10). A second gate valve (4), a second flow meter (5) and a second flow control valve group (6) are sequentially connected in series on the second blending manifold (10).

4. A crude oil online blending system according to claim 1, 2, or 3, characterized in that, The four tank group transfer pump lines are: tank group #1 transfer pump line, tank group #2 transfer pump line, tank group #3 transfer pump line, and tank group #4 transfer pump line. The inlet pipelines of pumps P207 and P208 are connected to the inlet pump line of tank group #1 and tank group #3, respectively; the outlet pipelines of pumps P207 and P208 are also connected to the inlet return line of tank group #1 and tank group #3, respectively; the inlet pipelines of pumps P206 and P205 are connected to the inlet pump line of tank group #4 and tank group #2, respectively; the outlet pipelines of pumps P207 and P208 are also connected to the inlet return line of tank group #4 and tank group #2, respectively.

5. The online crude oil blending system according to claim 2, characterized in that, Each of the aforementioned merging components includes a one-way valve (7) and a third gate valve (8). After the output ends of the first blending component and the second blending component merge, they are connected in series with the one-way valve (7) and the third gate valve (8) in sequence, and then connected to the corresponding tank group feed pump line after passing through the one-way valve (7) and the third gate valve (8).

6. The online crude oil blending system according to claim 5, characterized in that, The first blending manifold (9) and the second blending manifold (10) are each provided with four sub-pipelines. Each sub-pipeline of the first blending manifold (9) is connected to a first gate valve (1), a first flow meter (2) and a first flow control valve group (3); each sub-pipeline of the second blending manifold (10) is connected to a second gate valve (4), a second flow meter (5) and a second flow control valve group (6). After the sub-pipelines on the first blending manifold (9) and the sub-pipelines on the second blending manifold (10) are connected one-to-one, they are respectively connected to a group of the merging components.

7. A crude oil online blending system according to claim 3 or 6, characterized in that, Both the first flow control valve group (3) and the second flow control valve group (6) can reduce the pressure of the transported crude oil to the inlet pressure of the feed pump ≤0.2MPa, thus achieving matching with the inlet pressure of the crude oil feed pump.

8. The online crude oil blending system according to claim 2, characterized in that, The first flow meter (2) is used to measure the flow rate of crude oil of small varieties transported through the first blending manifold (9). The first flow control valve group (3) can accurately adjust the amount of crude oil of small varieties transported to the four tank groups into the pump line according to the measurement result of the first flow meter (2).

9. The online crude oil blending system according to claim 3, characterized in that, The second flow meter (5) is used to measure the flow rate of crude oil of small varieties transported through the second blending manifold (10). The second flow control valve group (6) can accurately adjust the amount of crude oil of small varieties transported to the four tank groups into the pump line according to the measurement result of the second flow meter (5).

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