Benzene tower flare gas recovery system
By introducing water-cooled heat exchanger and regulating valve group into the benzene tower torch system, the problems of difficulty in adjusting the operating pressure of benzene tower and waste energy consumption are solved, efficient recovery of benzene and pressure stability are achieved, and the operation process is optimized.
Patent Information
- Application Number
- CN202323587686.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-27
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2033-12-27
AI Technical Summary
In the prior art, the operation pressure adjustment of the benzene tower is difficult and frequent, resulting in waste of energy consumption. Some benzene products cannot be effectively recycled and need to be refined.
A water-cooled heat exchanger and regulating valve group were added to the torch pipeline on the original tank top. The benzene in the torch gas is cooled through the water cooler to control the pressure of the benzene tower, and the control valve group on the non-condensed gas pipeline is used to optimize the operation to reduce the frequency of on-site adjustments.
It effectively reduces the energy consumption loss of benzene after entering the torch separator tank, improves the pressure stability of benzene tower, optimizes the operating process, and reduces manpower consumption.
Smart Images
Figure CN222187866U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemical industry, in particular to a benzene tower flare gas recovery system. Background Art
[0002] Because the benzene tower needs to control the operating pressure of the benzene tower by adjusting the flare hand valve on the top of the benzene tower reflux tank, on-site adjustment is difficult and the operation is frequent, which takes up a lot of manpower. Because the flare process on the top of the tank is in an open state for a long time and the flow rate is relatively high, most of the benzene products enter the flare separator tank with the non-condensable gas, and this part of the oil needs to be re-refined, resulting in energy waste. Utility Model Content
[0003] In view of the defects of the prior art, the utility model provides a benzene tower flare gas recovery system, which achieves the purpose of recovering the benzene carried in the flare gas and controlling the pressure of the benzene tower by adding a water-cooled heat exchanger and a regulating valve group to the original tank top flare pipeline.
[0004] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is a benzene tower flare gas recovery system, which includes a benzene tower reflux tank, a flare gas lead-out pipeline, a water cooler, a non-condensable gas pipeline, a reflux pipeline, and a circulating water main; the benzene tower reflux tank is connected with a nitrogen supplement pipeline and a flare torch pipeline; the flare gas lead-out pipeline is connected with the flare torch pipeline; the water cooler is provided with a shell side inlet, a shell side non-condensable gas outlet, a shell side condensate outlet, a tube side inlet and a tube side outlet, and the shell side inlet is connected with the flare gas lead-out pipeline; the non-condensable gas pipeline is connected to the flare pipeline from the shell side non-condensable gas outlet, and a regulating valve group is provided on the non-condensable gas pipeline; the reflux pipeline is connected to the benzene tower reflux tank from the shell side condensate outlet; the circulating water main is respectively connected with the tube side inlet and the tube side outlet.
[0005] Furthermore, the regulating valve group includes a first gate valve, a first regulating valve and a second gate valve, a bypass pipeline is provided across the regulating valve group, and the bypass pipeline is provided with a bypass gate valve.
[0006] Furthermore, a first blind plate, a first one-way valve and a first shower valve are sequentially arranged on the non-condensable gas pipeline and downstream of the regulating valve group.
[0007] Furthermore, a front gate valve is arranged upstream of the first blind plate, and a rear gate valve is arranged downstream of the first shower valve.
[0008] Furthermore, the nitrogen replenishment pipeline is provided with a second one-way valve and a nitrogen regulating valve group in sequence.
[0009] Furthermore, the flare torch pipeline is sequentially provided with a second blind plate and a third one-way valve.
[0010] Furthermore, the circulating water main is connected to the pipe inlet through a circulating water supply line; the circulating water main is connected to the pipe outlet through a circulating water return line.
[0011] Furthermore, the circulating water supply pipeline is provided with a water supply valve; the circulating water return pipeline is provided with a water return valve.
[0012] Furthermore, the flare torch pipeline is provided with a second isolation blind plate, a fifth one-way valve and a second shower valve.
[0013] The beneficial effects of the utility model are as follows: the benzene tower reflux tank is connected to the water cooler through the flare gas outlet pipeline, and the benzene that can be cooled and recovered is returned to the benzene tower reflux tank through the reflux pipeline, so that the energy loss of this part of benzene after entering the flare liquid separation tank and then being recycled can be reduced. The non-condensable gas cooled by the water cooler is sent to the flare system through the non-condensable gas pipeline, and the newly added regulating valve group on the non-condensable gas pipeline is used to control the overall pressure stability of the benzene tower reflux tank and the benzene tower, so as to optimize the operation and reduce the frequency of on-site adjustment. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a process flow chart of a benzene tower flare gas recovery system in one embodiment of the utility model;
[0015] Figure 2 A process flow chart of a benzene tower flare gas recovery system in another embodiment of the utility model;
[0016] In the figure:
[0017] 100, benzene tower reflux tank, 110, nitrogen supply pipeline, 111, second one-way valve, 112, nitrogen regulating valve group, 120, flare pipeline, 121, second blind plate, 122, third one-way valve, 123, second shower valve,
[0018] 200, flare gas outlet pipeline, 210, flare gas outlet pipeline stop valve,
[0019] 300, water cooler, 310, shell side inlet, 320, shell side non-condensable gas outlet, 330, shell side condensate outlet, 340, tube side outlet, 350, tube side inlet,
[0020] 400, non-condensable gas pipeline, 410, regulating valve group, 411, first gate valve, 412, first regulating valve, 413, second gate valve, 420, bypass pipeline, 421, bypass gate valve, 430, first blind plate, 440, first non-return valve, 450, first shower valve, 460, front gate valve, 470, rear gate valve,
[0021] 500, reflux pipeline, 510, reflux pipeline stop valve,
[0022] 600, circulating water main pipe, 610, circulating water return line, 611, return valve, 620, circulating water supply line, 621, supply valve,
[0023] 1. Flare pipeline, 11. Flare gas stop valve, 12. Flare gas guide valve, 13. Flare gas blind plate, 14. Flare gas stop valve,
[0024] 2. Fuel gas pipeline, 21. Fuel gas stop valve, 22. Fuel gas blind plate, 23. Fuel gas one-way valve, 24. Fuel gas stop valve. DETAILED DESCRIPTION
[0025] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.
[0026] See also Figure 1 , shows a benzene tower flare gas recovery system in one embodiment of the utility model, which includes a benzene tower reflux tank 100, a flare gas outlet pipeline 200, a water cooler 300, a non-condensable gas pipeline 400, a reflux pipeline 500, and a circulating water main 600; the benzene tower reflux tank 100 is connected to a nitrogen supplement pipeline 110 and a flare discharge pipeline 120; the flare gas outlet pipeline 200 is connected to the flare discharge pipeline 120; the water cooler 300 is provided with a shell side inlet 310, a shell side ... The shell side condensate outlet 320, the shell side condensate outlet 330, the tube side inlet 350 and the tube side outlet 340, the shell side inlet 310 is connected to the flare gas outlet pipeline 200; the non-condensable gas pipeline 400 is connected to the flare pipeline 1 by the shell side non-condensable gas outlet 320, and the non-condensable gas pipeline 400 is provided with a regulating valve group 410; the reflux pipeline 500 is connected to the benzene tower reflux tank 100 by the shell side condensate outlet 330; the circulating water main pipe 600 is respectively connected to the tube side inlet 350 and the tube side outlet 340. In this embodiment, the water cooler 300 is a water-cooled heat exchanger. In addition, when it is necessary to explain, the cold material of the water cooler 300 enters from the bottom and exits from the top, that is, the tube side inlet 350 is connected to the lower part of the water cooler 300, and the tube side outlet 340 is connected to the upper part of the water cooler 300.
[0027] The above-mentioned benzene tower flare gas recovery system connects the benzene tower reflux tank 100 with the water cooler 300 through the flare gas outlet pipeline 200, cools the benzene that can be cooled and recovered, and returns it to the benzene tower reflux tank 100 through the reflux pipeline 500, so as to reduce the energy loss of this part of benzene after entering the flare liquid separator tank and then refining. The non-condensable gas cooled by the water cooler 300 is sent to the flare system through the non-condensable gas pipeline 400, and the newly added regulating valve group 410 on the non-condensable gas pipeline 400 is used to control the overall pressure stability of the benzene tower reflux tank 100 and the benzene tower, optimize the operation and reduce the frequency of on-site adjustment.
[0028] In one embodiment, the regulating valve group 410 includes a first gate valve 411, a first regulating valve 412 and a second gate valve 413. A bypass pipeline 420 is provided across the regulating valve group 410, and the bypass pipeline 420 is provided with a bypass gate valve 421. In specific configuration, the first regulating valve 412 is preferably a pressure control regulating valve.
[0029] In one embodiment, a first blind plate 430 , a first one-way valve 440 and a first shower valve 450 are sequentially arranged on the non-condensable gas pipeline 400 and downstream of the regulating valve group 410 .
[0030] In one embodiment, a front gate valve 460 is disposed upstream of the first blind plate 430 , and a rear gate valve 470 is disposed downstream of the first shower valve 450 .
[0031] In one embodiment, the nitrogen supplement pipeline 110 is provided with a second check valve 111 and a nitrogen regulating valve assembly 112 in sequence.
[0032] In one embodiment, the flare line 120 is provided with a second blind plate 121 and a third one-way valve 122 in sequence.
[0033] In one embodiment, the circulating water main pipe 600 is connected to the pipe side inlet 350 through a circulating water supply line 620 ; the circulating water main pipe 600 is connected to the pipe side outlet 340 through a circulating water return line 610 .
[0034] In one embodiment, the circulating water supply pipeline 620 is provided with a water supply valve 621 ; the circulating water return pipeline 610 is provided with a water return valve 611 .
[0035] In one embodiment, the flare pipeline 120 is provided with a second leaching valve 123 .
[0036] To further explain the transformation, the new water cooler 300 of the above-mentioned benzene tower flare gas recovery system is equipped with a pipeline from the water cooler 300 to the circulating water main 600. A gate valve is added to each newly added pipeline for control and isolation. The circulating water meets the nearest circulating water main 600. A new flare gas lead-out pipeline 200 is configured in front of the flare valve group of the benzene tower reflux tank 100 and connected to the shell side inlet of the water cooler 300. It should be noted that the original flare pipeline 120 can be selectively removed after the transformation is completed. A new non-condensable gas pipeline 400 is configured from the high point outlet of the shell side of the water cooler 300 and connected to the nearest flare pipeline 1. A regulating valve group 410 is provided on the newly added non-condensable gas pipeline 400 for controlling the pressure of the benzene tower reflux tank 100. At the same time, a three-valve group is provided, including a front gate valve 460, a first blind plate 430, a first non-return valve 440, a first drain valve 450, and a rear gate valve 470 for maintenance isolation; a new water cooler 300 is added, and a pipeline is configured from the low point outlet of the shell side of the water cooler 300 to be connected to the liquid phase inlet pipeline on the tank top of the benzene tower reflux tank 100. It should be noted that the condensate cooled by the water cooler 300 flows to the benzene tower reflux tank 100 by gravity, so there must be enough potential difference between the newly added water cooler 300 and the benzene tower reflux tank 100.
[0037] Before the transformation, the nitrogen replenishment process of the benzene tower reflux tank 100 was closed under normal conditions, and the flare process was opened. The gate valve of the flare process was used to control the pressure of the benzene tower and the reflux tank to be stable. After the transformation, a water cooler 300 was added before the flare pipeline 120 of the benzene tower reflux tank 100. The water cooler 300 was equipped with a circulating water supply pipeline 620 and a circulating water return pipeline 610 as the heat exchanger cold source. The condensate cooled by the water cooler 300 flowed back to the benzene tower reflux tank 100 through the reflux pipeline 500. The non-condensable gas cooled by the water cooler 300 entered the plant flare system through the non-condensable gas pipeline 400. The newly added regulating valve group 410 of the non-condensable gas pipeline 400 was used to control the stability of the benzene tower pressure. At the same time, the boundary valve group and the 8-shaped blind plate were configured on the non-condensable gas pipeline 400 for maintenance isolation.
[0038] In one embodiment, the flare gas stop valve 11, the flare gas drain valve 12, the flare gas blind plate 13 and the flare gas stop valve 14 are sequentially arranged on the flare pipeline 1. Preferably, during the specific transformation, the nearest flare meeting point is selected, and it can be connected to any flare main pipe during the actual implementation. As an example, in this embodiment, the non-condensable gas pipeline 400 is connected to the nearest flare pipeline 1, and the flare pipeline 1 is led out by the gas discharge pipeline. The gas discharge pipeline in this embodiment also includes a fuel gas pipeline 2, and the fuel gas pipeline 2 is sequentially provided with a fuel gas stop valve 21, a fuel gas blind plate 22, a fuel gas one-way valve 23 and a fuel gas stop valve 24.
[0039] See also Figure 2Further, in one embodiment, the flare gas outlet pipeline 200 is provided with a flare gas outlet pipeline stop valve 210, and the return pipeline 500 is provided with a return pipeline stop valve 510. With such a configuration, when the water cooler 300 needs to be repaired, the flare gas outlet pipeline stop valve 210 and the return pipeline stop valve 510 can be closed, and the front gate valve 460 and the rear gate valve 470 on the non-condensable gas pipeline 400 can be closed to cut off the flare gas outlet pipeline 200, the return pipeline 500 and the non-condensable gas pipeline 400, and the benzene tower pressure can be discharged and adjusted by the flare pipeline 120, which makes maintenance more convenient and the system more flexible and reliable.
[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0043] In the present utility model, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. 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 method.
Claims
1. A benzene tower flare gas recovery system, characterized in that: include The benzene tower reflux tank is connected with a nitrogen supply pipeline and a flare pipeline; A flare gas outlet pipeline connected to the flare discharge pipeline; A water cooler, provided with a shell side inlet, a shell side non-condensable gas outlet, a shell side condensate outlet, a tube side inlet and a tube side outlet, wherein the shell side inlet is connected to the flare gas outlet pipeline; A non-condensable gas pipeline, connected to a flare pipeline from the shell-side non-condensable gas outlet, and a regulating valve group is provided on the non-condensable gas pipeline; A reflux pipeline, connected from the shell side condensate outlet to the benzene tower reflux tank; and The circulating water main pipe is connected to the pipe inlet and pipe outlet respectively.
2. A benzene tower flare gas recovery system according to claim 1, characterized in that: The regulating valve group includes a first gate valve, a first regulating valve and a second gate valve. A bypass pipeline is arranged across the regulating valve group, and the bypass pipeline is provided with a bypass gate valve.
3. A benzene tower flare gas recovery system according to claim 1, characterized in that: A first blind plate, a first one-way valve and a first shower valve are sequentially arranged on the non-condensable gas pipeline and downstream of the regulating valve group.
4. A benzene tower flare gas recovery system according to claim 3, characterized in that: A front gate valve is arranged upstream of the first blind plate, and a rear gate valve is arranged downstream of the first shower guide valve.
5. A benzene tower flare gas recovery system according to any one of claims 1-4, characterized in that: The nitrogen replenishing pipeline is provided with a second one-way valve and a nitrogen regulating valve group in sequence.
6. A benzene tower flare gas recovery system according to any one of claims 1-4, characterized in that: The flare torch pipeline is sequentially provided with a second blind plate and a third one-way valve.
7. A benzene tower flare gas recovery system according to any one of claims 1-4, characterized in that: The circulating water main pipe is connected to the pipe inlet through a circulating water supply line; the circulating water main pipe is connected to the pipe outlet through a circulating water return line.
8. A benzene tower flare gas recovery system according to claim 7, characterized in that: The circulating water supply pipeline is provided with a water supply valve; the circulating water return pipeline is provided with a water return valve.
9. A benzene tower flare gas recovery system according to any one of claims 1-4, characterized in that: The flare torch pipeline is provided with a second isolation blind plate, a fifth one-way valve and a second shower valve.