Reformate tower feeding system
By connecting a filter in parallel to the reforming tower feed system and utilizing the heat at the top of the tower, the problems of impurity blockage and insufficient feed pressure in the reforming tower feed system were solved, thereby improving separation accuracy and operating space at the top of the tower.
Patent Information
- Application Number
- CN202423256092.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-29
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2034-12-29
AI Technical Summary
In the two adsorption units of the aromatics plant, the feed system of the reforming oil tower has problems such as excessive impurities leading to heat exchanger blockage, easy clogging of pump filters, and insufficient feed pressure. Especially in the high-temperature summer, the air cooler at the top of the tower is fully utilized and there is no room for operation.
Two filters are installed in parallel in the reforming tower feed system, and the excess heat at the top of the tower is used for heat exchange at high temperatures to enhance the heat exchange capacity at the top of the tower, improve the impurity problem, and improve the separation accuracy.
It effectively solved the problems of impurity blockage and insufficient feeding pressure in the reforming oil tower feed system, improved the separation accuracy, and solved the operating space limitation of the tower top air cooler under high temperature.
Smart Images
Figure CN223780195U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of chemical production, specifically is a reforming oil tower feeding system. BACKGROUND
[0002] The production process of the two sets of devices of aromatic hydrocarbon plant adsorption is prone to the problems of reforming oil tower feeding heat exchanger blockage, reforming oil tower bottom pump filter frequent blockage, reforming oil tower impurity cleaning difficulty, and low feeding pressure of two sets of adsorption devices, summer reforming oil tower overhead air cooler cannot operate due to full frequency conversion and the like because of more impurities in the feed of the self-depentanizer bottom heat exchanger. SUMMARY
[0003] In view of the defects of the prior art, the utility model provides a reforming oil tower feeding system which can improve the problems of more impurities in the feed of the reforming, reforming oil tower feeding heat exchanger blockage, reforming oil tower bottom pump filter blockage, and further improve the problem of insufficient feeding pressure of two sets of adsorption devices.
[0004] In order to achieve the above purpose, the utility model provides a technical scheme of a reforming oil tower feeding system which comprises a depentanizer, a first heat exchanger, a second heat exchanger, a reforming oil tower overhead heat exchanger and a reforming oil tower bottom heat exchanger; the bottom of the depentanizer is connected with a bottom discharge pipeline, two pumps are arranged in parallel on the bottom discharge pipeline; the tube side inlet of the first heat exchanger is connected with the bottom discharge pipeline; the shell side inlet of the second heat exchanger is connected with the tube side outlet of the first heat exchanger, the shell side outlet of the second heat exchanger is connected with a first heat exchange pipeline, two filters are arranged in parallel on the first heat exchange pipeline; the tube side inlet of the reforming oil tower overhead heat exchanger is connected with the first heat exchange pipeline, and the tube side outlet of the reforming oil tower overhead heat exchanger is connected with a second heat exchange pipeline; the tube side inlet of the reforming oil tower bottom heat exchanger is connected with the second heat exchange pipeline, and the tube side outlet of the reforming oil tower bottom heat exchanger is connected to the feeding inlet of the reforming oil tower.
[0005] Further, the bottom discharge outlet of the reforming oil tower is connected to a reforming oil tower bottom pump, the reforming oil tower bottom pump is connected to the shell side inlet of the reforming oil tower bottom heat exchanger, and the shell side outlet of the reforming oil tower bottom heat exchanger is connected to a white clay tower.
[0006] Further, the white clay tower is connected to a xylene redistillation tower through a white clay tower discharge pipeline.
[0007] Further, a white clay tower discharge heat exchanger is arranged on the white clay tower discharge pipeline.
[0008] Further, the tube side inlet of the second heat exchanger is connected to the tank bottom of a liquefied gas absorption tank, and the tube side outlet of the second heat exchanger is connected to the tank top of a dechlorination tank.
[0009] Further, the tank bottom of the dechlorination tank is connected to the shell side inlet of the first heat exchanger, and the shell side outlet of the first heat exchanger is connected to the feed inlet of the depentanizer.
[0010] Further, the shell side inlet of the reforming oil column overhead heat exchanger is connected to the reforming oil column overhead, the shell side outlet of the reforming oil column overhead heat exchanger is connected to the overhead air cooler, the overhead air cooler is connected to the reflux tank, and the reflux tank is connected to the reflux inlet of the reforming oil column through a reflux pump.
[0011] Further, the inlet of the filter is provided with an inlet double valve, and the outlet of the filter is provided with an outlet double valve.
[0012] Further, the inlet of the mechanical pump is provided with an inlet single valve, the outlet of the mechanical pump is provided with an outlet single valve, and the downstream of the outlet single valve is provided with a one-way valve.
[0013] Further, a bypass double valve is arranged across the outlet single valve and the one-way valve.
[0014] The beneficial effects of the present application are as follows: two filters are arranged in parallel on the first heat exchange pipeline, which can filter the material at the bottom of the depentanizer, improve the problem of many impurities in the reforming feed, many impurities at the bottom of the reforming oil column, easy blockage of the reforming oil column feed heat exchanger, and easy blockage of the reforming oil column bottom pump filter, and further improve the problem of insufficient pressure of the reforming to two sets of adsorption feeding. In addition, when the temperature is relatively high in summer, the reforming feed can be filtered through the two filters arranged in parallel on the first heat exchange pipeline, and then introduced into the reforming oil column overhead heat exchanger for heat exchange, effectively utilizing the excess heat at the top of the reforming oil column, and after the reform, the overhead heat exchange capacity is enhanced, the reflux can be increased, and the separation precision of the reforming oil column is improved, and to a certain extent, the problem of no operation space of the overhead air cooler of the reforming oil column is solved. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 A reforming oil column feed system process flow chart in an embodiment of the present application;
[0016] Figure 2 A reforming oil column feed system process flow chart in another embodiment of the present application;
[0017] In the drawings:
[0018] 100, depentanizer, 110, bottom discharge pipeline, 111, 112, mechanical pump, 1111, 1121, inlet single valve, 1112, 1122, outlet single valve, 1113, 1123, one-way valve, 1114, 1124, bypass double valve,
[0019] 200, first heat exchanger,
[0020] 300, second heat exchanger, 310, first heat exchange line, 311, 312, filter, 3111, 3121, inlet double valve, 3112, 3122, outlet double valve, 320, dechlorination tank,
[0021] 400, reforming oil column overhead heat exchanger, 410, second heat exchange line, 420, overhead air cooler, 430, reflux tank, 440, reflux pump,
[0022] 500, reforming oil column bottom heat exchanger,
[0023] 600, reforming oil column, 610, reforming oil column bottom pump,
[0024] 700, clay column, 710, clay column discharge line, 711, clay column discharge heat exchanger,
[0025] 800, xylene redistillation column,
[0026] 900, liquefied gas absorption tank. DETAILED DESCRIPTION
[0027] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying 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 ways beyond the specific details set forth herein without departing from the scope of the present application, and it can be apparent to those skilled in the art that similar modifications can be made without departing from the scope of the present application, and therefore the present application is not limited to the following specific embodiments disclosed.
[0028] Referring to Figure 1The utility model discloses a kind of reforming oil tower feed system's process flow diagram, it includes de-pentane column 100, first heat exchanger 200, second heat exchanger 300, reforming oil tower overhead heat exchanger 400 and reforming oil tower bottom heat exchanger 500;The bottom of de-pentane column 100 is connected with bottom discharge pipeline 110, two machine pumps 111,112 are arranged in parallel on bottom discharge pipeline 110;The tube side inlet of first heat exchanger 200 is connected with bottom discharge pipeline 110;The shell side inlet of second heat exchanger 300 is connected with the tube side outlet of first heat exchanger 200, the shell side outlet of second heat exchanger 300 is connected with first heat exchange pipeline 310, two filters 311,312 are arranged in parallel on first heat exchange pipeline 310;The tube side inlet of reforming oil tower overhead heat exchanger 400 is connected with first heat exchange pipeline 310, the tube side outlet of reforming oil tower overhead heat exchanger 400 is connected with second heat exchange pipeline 410;The tube side inlet of reforming oil tower bottom heat exchanger 500 is connected with second heat exchange pipeline 410, the tube side outlet of reforming oil tower bottom heat exchanger 500 is connected to the inlet of reforming oil tower 600.
[0029] The above-mentioned reforming oil tower feed system is arranged in parallel with two filters 311,312 on first heat exchange pipeline 310, can filter the material at the bottom of de-pentane column 100, improve the problem that reforming feed heat exchanger is easily blocked, reforming oil tower bottom pump filter is easily blocked, and further improve the problem that reforming to two sets of adsorption feeding pressure is insufficient. In addition, when the temperature is higher in summer, the reforming feed can be filtered through the two filters 311,312 arranged in parallel on the first heat exchange pipeline 310, and then introduced into the reforming oil tower overhead heat exchanger 400 for heat exchange, effectively utilizing the excess heat at the top of the reforming oil tower. After modification, the overhead heat exchange capacity is enhanced, the reflux can be increased to improve the separation precision of the reforming oil tower, and to some extent, the problem of no operation space of the overhead air cooler 420 of the reforming oil tower due to excessively high temperature is solved.
[0030] In actual use, one of the two filters 311,312 can be used as a spare, and the other one can be used as a main filter. When specifically setting, the filters 311,312 are type II pressure vessels with Q345R as the main material, and the design pressure is 1.55 MPa and the design temperature is 60 degrees Celsius.
[0031] In an embodiment, the bottom discharge port of the reforming oil tower 600 is connected to a reforming oil tower bottom pump 610, the reforming oil tower bottom pump 610 is connected to the shell side inlet of the reforming oil tower bottom heat exchanger 500, and the shell side outlet of the reforming oil tower bottom heat exchanger 500 is connected to a white clay tower 700.
[0032] In an embodiment, the white clay tower 700 is connected to a xylene redistillation tower 800 through a white clay tower discharge pipeline 710.
[0033] In an embodiment, a clay tower discharge pipeline 710 is provided with a clay tower discharge heat exchanger 711.
[0034] In an embodiment, the tube side inlet of the second heat exchanger 300 is connected to the tank bottom of the liquefied gas absorption tank 900, and the tube side outlet of the second heat exchanger 300 is connected to the tank top of the dechlorination tank 320.
[0035] In an embodiment, the tank bottom of the dechlorination tank 320 is connected to the shell side inlet of the first heat exchanger 200, and the shell side outlet of the first heat exchanger 200 is connected to the feed inlet of the de-pentane tower 100.
[0036] In an embodiment, the shell side inlet of the reforming oil tower overhead heat exchanger 400 is connected to the reforming oil tower overhead, the shell side outlet of the reforming oil tower overhead heat exchanger 400 is connected to the overhead air cooler 420, the overhead air cooler 420 is connected to the reflux tank 430, and the reflux tank 430 is connected to the reflux inlet of the reforming oil tower 600 through the reflux pump 440.
[0037] Process flow: The tower bottom discharge is discharged from the tower bottom outlet of the de-pentane tower 100 to two mechanical pumps 111, 112, a de-pentane tower bottom heat exchanger, i.e., the first heat exchanger 200 and the second heat exchanger 300, and then enters two filters 311, 312, and then to the reforming oil tower overhead heat exchanger 400 for heat exchange, passes through the reforming oil tower bottom heat exchanger 500, and then enters the reforming oil tower 600, the shell side of the reforming oil tower overhead heat exchanger 400 is heat exchanged, enters the overhead air cooler 420, and then passes through the reflux tank 430 and the reflux pump 440 in sequence, and returns to the reforming oil tower 600.
[0038] Specifically, in an embodiment, the inlet of the filter 311, 312 is provided with an inlet double valve 3111, 3121, and the outlet of the filter 311, 312 is provided with an outlet double valve 3112, 3122. In this embodiment, an inlet double valve 3111, 3121 and an outlet double valve 3112, 3122 are respectively arranged at the inlet and outlet of the two filters 311, 312. In specific operation, the filters 311, 312 can be selectively isolated by using valves, one standby and one in use. When a filter fails, it can be switched.
[0039] Further, in an embodiment, the inlet of the mechanical pump 111, 112 is provided with an inlet single valve 1111, 1121, the outlet of the mechanical pump 111, 112 is provided with an outlet single valve 1112, 1122, and the downstream of the outlet single valve 1112, 1122 is provided with a one-way valve 1113, 1123.
[0040] Further, a bypass double valve 1114, 1124 is arranged across the outlet single valve 1112, 1122 and the one-way valve 1113, 1123.
[0041] When working normally, the material is sent from the outlet single valve 1112, 1122 and the downstream check valve 1113, 1123, and when the outlet single valve 1112, 1122 and the downstream check valve 1113, 1123 are closed, the material flows through the bypass double valve 1114, 1124.
[0042] The purposes of setting the bypass for the centrifugal pump outlet valve mainly include the following points:
[0043] Prevent cavitation: The bypass between the pump inlet and the cut-off valve can balance the pressure at the pump inlet and prevent steam from entering the pump body to cause cavitation.
[0044] Balance the pipeline pressure: The bypass on both sides of the cut-off valve at the outlet of the high-lift pump can help balance the one-way force of the valve, especially in the case that the large-diameter valve is difficult to open.
[0045] Warm the pump and prevent condensation bypass: When the temperature of the material transported by the pump exceeds 200 DEG C, a small amount of material flows into the pump body through the bypass, so that the pump is in a hot standby state. In addition, when the air temperature is lower than the freezing point of the material, a warm pump bypass also needs to be set to prevent the material from freezing in the pump body.
[0046] Small flow return line: When the centrifugal pump operates at less than 20% of the rated flow for a short period of time, the bypass ensures that the pump always operates above the minimum continuous stable flow, avoiding problems such as blade pitting / wear, shell / bearing overheating, etc.
[0047] Control the outlet bypass of the pump: In some specific applications, such as the evaporation crystallization field, since the fluid transported is mostly solid-liquid mixed slurry, pipeline blockage and other situations are prone to occur, and controlling the outlet bypass of the pump becomes a more scientific and reasonable choice.
[0048] In summary, the main purposes of the bypass of the outlet valve of the centrifugal pump are to protect the pump body from damage, ensure the stable operation of the centrifugal pump, and optimize the performance of the centrifugal pump under certain conditions.
[0049] In the description of the utility model, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the device or element indicated to have a specific orientation, to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model.
[0050] In addition, the terms "first", "second", 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" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.
[0051] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be 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 in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0052] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be indirectly contacted through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature. It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this paper are only for illustrative purposes, and do not represent the only embodiment.
Claims
1. A reformer oil column feed system characterized by: comprising a de-pentanizer column, a bottom outlet of which is connected to a bottom outlet pipeline, two mechanical pumps being arranged in parallel on the bottom outlet pipeline; a first heat exchanger, a tube side inlet of which is connected to the bottom outlet pipeline; a second heat exchanger, a shell side inlet of which is connected to a tube side outlet of the first heat exchanger, a shell side outlet of the second heat exchanger being connected to a first heat exchange pipeline, two filters being arranged in parallel on the first heat exchange pipeline; a reformate column overhead heat exchanger, a tube side inlet of which is connected to the first heat exchange pipeline, a tube side outlet of the reformate column overhead heat exchanger being connected to a second heat exchange pipeline; a reformate column bottom heat exchanger, a tube side inlet of which is connected to the second heat exchange pipeline, a tube side outlet of the reformate column bottom heat exchanger being connected to a feed inlet of the reformate column.
2. A reformer column feed system according to claim 1, wherein: a bottom outlet of the reformate column is connected to a reformate column bottom pump, the reformate column bottom pump being connected to a shell side inlet of the reformate column bottom heat exchanger, a shell side outlet of the reformate column bottom heat exchanger being connected to a clay tower.
3. A reformer column feed system according to claim 2, wherein: the clay tower is connected to a xylene rerun column through a clay tower outlet pipeline.
4. A reformer column feed system according to claim 3, wherein: a clay tower outlet heat exchanger is arranged on the clay tower outlet pipeline.
5. A reformer column feed system according to any one of claims 1 to 4, wherein: a tube side inlet of the second heat exchanger is connected to a tank bottom of a liquefied gas absorption tank, a tube side outlet of the second heat exchanger being connected to a tank top of a de-chlorination tank.
6. A reformer column feed system according to claim 5, wherein: a tank bottom of the de-chlorination tank is connected to a shell side inlet of the first heat exchanger, a shell side outlet of the first heat exchanger being connected to a feed inlet of the de-pentanizer column.
7. A reformer column feed system according to any one of claims 1 to 4, wherein: a shell side inlet of the reformate column overhead heat exchanger is connected to a reformate column overhead, a shell side outlet of the reformate column overhead heat exchanger being connected to an overhead air cooler, the overhead air cooler being connected to a reflux tank, the reflux tank being connected to a reflux inlet of the reformate column through a reflux pump.
8. A reformer column feed system according to any one of claims 1-4, characterized by: an inlet double valve is arranged at an inlet of the filter, an outlet double valve being arranged at an outlet of the filter.
9. A reformer column feed system according to any one of claims 1-4, characterized by: an inlet single valve is arranged at an inlet of the mechanical pump, an outlet single valve being arranged at an outlet of the mechanical pump, a check valve being arranged downstream of the outlet single valve.
10. A reformer column feed system according to claim 9, wherein: a bypass double valve is arranged across the outlet single valve and the check valve.