Light naphtha pump flow control system of reforming pre-hydrogenation unit

Abstract

The utility model relates to a reforming pre-hydrogenation unit, in particular to a flow control system of a naphtha extraction pump at the top of a naphtha separation tower of the reforming pre-hydrogenation unit, which belongs to the field of petrochemical engineering and comprises a naphtha separation tower, a reflux tank, a reflux pump, a light naphtha pump and a crossing pipeline. The naphtha separation tower is connected to the reflux tank through a tower top outlet pipeline, the reflux tank is connected to an inlet of the naphtha separation tower through a reflux pipeline and a reflux pump, and the reflux tank extracts light naphtha through a light naphtha delivery pipeline and a light naphtha pump; the reflux pump outlet is connected to the light naphtha pump outlet through a crossover line. The light naphtha pump can be stopped when pumice is insufficient, and small-flow stable delivery of the light naphtha is realized by crossing a pipeline. Furthermore, the stability of the feeding flow and components of the C4 / C5 separation tower and the product quality are ensured, and the start-stop frequency of a pump and the adjustment difficulty of internal operation are greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to reforming prehydrogenation unit, concretely relates to reforming prehydrogenation unit naphtha separation tower tower top naphtha production pump's flow control system, belongs to the field of petroleum chemical industry. BACKGROUND

[0002] Because reformer prehydrogenation unit when processing heavy oil, light component accounts for low, naphtha separation tower tower top material is few, reflux tank liquid level is insufficient, simultaneously for maintaining the separation precision of naphtha separation tower, guaranteeing continuous, stable reflux ratio and sample's qualified, need to the intermittent start -stop of light naphtha pump.

[0003] At present, under the condition that the feed component of the naphtha separation tower tower top light naphtha pump is heavy, the reflux tank liquid level is insufficient, which cannot meet the requirement of the minimum flow operation of the light naphtha pump, and the light naphtha pump needs to be intermittently started and stopped. However, the intermittent start and stop of the light naphtha pump has a great influence on the feed component of the C4 / C5 separation tower, which easily leads to unqualified product quality of the C4 / C5 separation tower and great operation difficulty. SUMMARY

[0004] In view of the deficiency of the existing process flow, the utility model aims at increasing a flow that guarantees stable small flow light naphtha delivery between the outlet of the naphtha separation tower reflux pump and the outlet of the light naphtha pump, so as to meet the requirement of the minimum flow operation of the light naphtha pump.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of a reformer prehydrogenation unit light naphtha pump flow control system, comprising a naphtha separation tower, a reflux tank, a reflux pump, a light naphtha pump and a cross-line pipeline; the naphtha separation tower is connected to the reflux tank through a tower top outlet pipeline, the reflux tank is connected to the naphtha separation tower inlet through a reflux pipeline and a reflux pump, the reflux tank takes out light naphtha through a light naphtha delivery pipeline and a light naphtha pump, and the reflux pump outlet is connected to the light naphtha pump outlet through a cross-line pipeline.

[0006] Further, a cross-line inlet valve and a cross-line check valve are sequentially arranged at the inlet of the cross-line pipeline, and a cross-line outlet valve is arranged at the outlet of the cross-line pipeline.

[0007] Further, the cross-line inlet valve and the cross-line outlet valve are both gate valves.

[0008] Further, the inlet of the reflux pump is provided with a reflux pump inlet valve, and the outlet of the reflux pump is sequentially provided with a reflux pump outlet check valve and a reflux pump outlet valve.

[0009] Further, the inlet of the cross-line pipeline is connected downstream of the reflux pump outlet valve through a tee joint.

[0010] Further, the inlet of the naphtha pump is provided with a naphtha pump inlet valve, and the outlet of the naphtha pump is sequentially provided with a naphtha pump outlet valve and a naphtha pump outlet regulating valve group.

[0011] Further, the outlet of the cross-pipeline is connected between the naphtha pump outlet valve and the naphtha pump outlet regulating valve group through a tee joint.

[0012] The outlet of the reflux tank is connected with a reflux tank outlet header, and the inlet of the reflux pipeline and the naphtha delivery pipeline are respectively connected with the reflux tank outlet header.

[0013] Further, the naphtha delivery pipeline is connected to a C4 / C5 separation tower.

[0014] The beneficial effects of the present application are as follows: by adding the cross-pipeline from the reflux pump outlet to the naphtha pump outlet, when the reforming prehydrogenation unit processes heavy oil, the insufficient naphtha cannot maintain the minimum flow of the naphtha pump, and the naphtha pump cannot be intermittently started and stopped, and the intermittent start and stop of the naphtha pump can also avoid affecting the feed components of the C4 / C5 separation system, thereby affecting the product quality. The present application can stop the naphtha pump when the naphtha is insufficient, and the cross-pipeline can realize the stable delivery of the small flow of naphtha. Further, the present application can ensure the stability of the C4 / C5 separation tower feed flow and components and the product quality, and greatly reduce the start and stop frequency of the pump and the adjustment difficulty of the internal operation. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The present application is a schematic diagram of a naphtha pump flow control system of a reforming prehydrogenation unit.

[0016] In the figure: 1, naphtha separation tower, 2, reflux tank, 3, reflux pump, 4, naphtha pump, 5, cross-pipeline, 6, tower top outlet pipeline, 7, reflux pipeline, 8, naphtha delivery pipeline, 9, cross-line inlet gate valve, 10, cross-line check valve, 11, cross-line outlet gate valve, 12, reflux pump inlet valve, 13, reflux pump outlet check valve, 14, reflux pump outlet valve, 15, naphtha pump inlet valve, 16, naphtha pump outlet valve, 17, naphtha pump outlet regulating valve group. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and understandable, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different manners other than those described herein, and it can be apparent to those skilled in the art that similar modifications of the present application can be made without departing from the scope of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0018] Referring to the drawings Figure 1 A reforming pre-hydrogenation unit light naphtha pump flow control system, comprising a naphtha separation tower 1, a reflux tank 2, a reflux pump 3, a light naphtha pump 4 and a cross pipeline 5; the naphtha separation tower 1 is connected to the reflux tank 2 through a tower top outlet pipeline 6, the reflux tank 2 is connected to the naphtha separation tower 1 inlet through a reflux pipeline 7 and the reflux pump 3, the reflux tank 2 sends out the light naphtha production to a reforming unit C4 / C5 separation tower through a light naphtha sending-out pipeline 8 and the light naphtha pump 4, and the reflux pump 3 outlet is connected to the light naphtha pump 4 outlet through the cross pipeline 5. A cross-line inlet gate valve 9 and a cross-line one-way valve 10 are sequentially arranged at the inlet of the cross pipeline 5, and a cross-line outlet gate valve 11 is arranged at the outlet of the cross pipeline 5.

[0019] Further, the inlet of the reflux pump 3 is provided with a reflux pump inlet valve 12, and the outlet of the reflux pump 3 is sequentially provided with a reflux pump outlet one-way valve 13 and a reflux pump outlet valve 14.

[0020] Further, the inlet of the cross pipeline 5 is connected downstream of the reflux pump outlet valve 14 through a tee joint.

[0021] Further, the inlet of the light naphtha pump 4 is provided with a light naphtha pump inlet valve 15, and the outlet of the light naphtha pump 4 is sequentially provided with a light naphtha pump outlet valve 16 and a light naphtha pump outlet regulating valve group 17.

[0022] Further, the outlet of the cross pipeline 5 is connected between the light naphtha pump outlet valve 16 and the light naphtha pump outlet regulating valve group 17 through a tee joint.

[0023] Further, the outlet of the reflux tank 2 is connected to a reflux tank outlet header, and the inlets of the reflux pipeline 7 and the light naphtha sending-out pipeline 8 are respectively connected to the reflux tank outlet header.

[0024] The pipeline modification process is as follows: a first three-way joint is added after the reflux pump outlet valve for connecting the inlet of the cross pipeline 5; a second three-way joint is added at the light naphtha pump outlet for connecting the outlet of the cross pipeline 5; a cross pipeline 5 is arranged between the first three-way joint and the second three-way joint; a cross-line inlet gate valve 9 is added on the cross pipeline 5 at the reflux pump outlet and close to the first three-way joint position for controlling and isolating materials; a cross-line check valve 10 is added close to the newly added cross-line inlet gate valve 9 to avoid the influence of the start and stop of the light naphtha pump on the flow of the reflux pump outlet; and a cross-line outlet gate valve 11 is added on the cross pipeline 5 close to the second three-way joint at the light naphtha pump outlet for controlling and isolating materials.

[0025] By adding the cross pipeline 5 from the reflux pump 3 outlet to the light naphtha pump 4 outlet, when heavy oil is processed in the reforming pre-hydrogenation unit, the intermittent start and stop caused by insufficient light naphtha to maintain the minimum flow of the light naphtha pump 4 can be avoided, and the great influence of the intermittent start and stop of the light naphtha pump 4 on the feed component of the C4 / C5 separation system can also be avoided, thereby affecting the product quality. In this way, when the light naphtha is insufficient, the light naphtha pump 4 can be stopped, and the newly added cross pipeline 5 at the reflux pump 3 outlet and the light naphtha pump outlet regulating valve group 17 can be used to realize stable delivery of small flow of light naphtha. Further, the stability of the C4 / C5 separation tower feed flow and component and the product quality are ensured, and the start and stop frequency of the machine pump and the adjustment difficulty of the internal operation are greatly reduced.

[0026] It should be noted that the parts not described in detail in the utility model are prior art.

[0027] The terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0028] In the utility model, unless otherwise specifically defined and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0029] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be the first and second features directly contact, or the first and second features indirectly contact through intermediate media. Moreover, the first feature "on", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or just indicate that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or just indicate that the first feature is less than the second feature in horizontal height.

[0030] It should be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0031] The above is only the best embodiment of the present application. Obviously, the present application is not limited to the above embodiments, and there can be many variations. All variations that can be directly derived or inferred from the disclosed content by those of ordinary skill in the art should be considered within the scope of the present application.

Claims

1. A reformer prehydrogenation unit light naphtha pump flow control system characterized by: The naphtha separation column is connected to the reflux tank through a tower top outlet pipeline, the reflux tank is connected to the naphtha separation column inlet through a reflux pipeline and a reflux pump, the reflux tank discharges light naphtha through a light naphtha delivery pipeline and a light naphtha pump, and the reflux pump outlet is connected to the light naphtha pump outlet through a cross pipeline.

2. The reformer pre-adding hydrogen unit light naphtha pump flow control system according to claim 1, characterized in that: A cross-line inlet valve and a cross-line check valve are sequentially arranged at the inlet of the cross pipeline, and a cross-line outlet valve is arranged at the outlet of the cross pipeline.

3. A pump flow control system for a pre-reforming unit light naphtha pump as recited in claim 2, wherein: The cross-line inlet valve and the cross-line outlet valve are both gate valves.

4. The reformer pre-adding hydrogen unit light naphtha pump flow control system according to claim 1, characterized in that: The inlet of the reflux pump is provided with a reflux pump inlet valve, and the outlet of the reflux pump is sequentially provided with a reflux pump outlet check valve and a reflux pump outlet valve.

5. A reformer pre-adding hydrogen unit light naphtha pump flow control system according to claim 4, characterized in that: The inlet of the cross pipeline is connected downstream of the reflux pump outlet valve through a tee joint.

6. A reformer pre-adding hydrogen unit light naphtha pump flow control system according to claim 1, characterized in that: The inlet of the light naphtha pump is provided with a light naphtha pump inlet valve, and the outlet of the light naphtha pump is sequentially provided with a light naphtha pump outlet valve and a light naphtha pump outlet regulating valve group.

7. A reformer pre-adding hydrogen unit light naphtha pump flow control system according to claim 6, characterized in that: The outlet of the cross pipeline is connected between the light naphtha pump outlet valve and the light naphtha pump outlet regulating valve group through a tee joint.

8. A reformer pre-adding hydrogen unit light naphtha pump flow control system according to claim 1, characterized in that: The outlet of the reflux tank is connected to a reflux tank outlet header, and the inlets of the reflux pipeline and the light naphtha delivery pipeline are respectively connected to the reflux tank outlet header.

9. A reformer pre-adding hydrogen unit light naphtha pump flow control system according to claim 1, characterized in that: The light naphtha delivery pipeline is connected to a C4 / C5 separation column of a reforming unit.

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