Nitrogen system of adsorption tower

Abstract

The utility model relates to the technical field of chemical engineering, in particular to an adsorption tower nitrogen system which comprises an adsorption tower, a raffinate mixing tank, a desorption agent main pipeline, a first outlet line, a second outlet line, a central outlet line, a nitrogen pressure maintaining line, a nitrogen pipeline, a crossover line and a pumping circulation line, valves are arranged at an outlet and an inlet of the raffinate mixing tank; the desorption agent main pipeline is connected to an inlet I of the adsorption tower; one end of the first outlet line is connected to an outlet I of the adsorption tower, and the other end of the first outlet line is connected to the raffinate tower through the raffinate mixing tank. During the shutdown period of the adsorption tower, the pressure of the central pipe of the adsorption tower can be maintained, the deformation of the central pipe is prevented, the balance with the pressure of the adsorption tower is realized, and the purpose of protecting equipment is achieved.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, specifically to a nitrogen system for an adsorption tower. Background Technology

[0002] The central tube of the adsorption tower is a crucial supporting component inside the tower. It is a hollow pipe filled with liquid. During operation, the internal pressure is maintained by the material, ensuring stability. In the event of an interlock shutdown, to protect the adsorption tower, the material inlet and outlet are cut off, and nitrogen is introduced to maintain pressure and prevent vaporization of the material, which could damage the adsorbent. The pressure in the central tube can only be maintained by closing the inlet and outlet valves. However, if there is internal leakage in the isolation valve, the pressure in the central tube cannot be maintained, and a continuous drop can easily cause deformation of the central tube, thereby damaging the internal components of the adsorption tower. Utility Model Content

[0003] In view of the deficiencies of the prior art, this utility model provides a nitrogen system for an adsorption tower. During the shutdown period of the adsorption tower, this application can maintain the pressure of the central tube of the adsorption tower, prevent the central tube from deforming, achieve a balance with the pressure of the adsorption tower, and play a role in protecting the equipment.

[0004] To achieve the above objectives, the present invention provides a nitrogen system for an adsorption tower, comprising an adsorption tower, a raffinate mixing tank, a desorbent main pipeline, a first outlet line, a second outlet line, a central outlet line, a nitrogen pressure holding line, a nitrogen pipeline, a cross-line, and a pumping circulation line; valves are installed at the outlet and inlet of the raffinate mixing tank; the desorbent main pipeline is connected to the inlet one of the adsorption tower; one end of the first outlet line is connected to the outlet one of the adsorption tower, and the other end is connected to the raffinate tower through the raffinate mixing tank; one end of the second outlet line is connected to the outlet two of the adsorption tower, and the other end is connected to the first outlet line; the central outlet line... One end of the outlet line is connected to the central pipe outlet of the adsorption tower, and the other end is connected to the second outlet line; the nitrogen pressure holding line comes from the nitrogen cylinder and is connected to the second outlet line. The nitrogen pressure holding line is provided with a first nitrogen branch line and a second nitrogen branch line. The first nitrogen branch line is connected to the second inlet of the adsorption tower; the nitrogen pipeline comes from the nitrogen system and is connected to the nitrogen pressure holding line. The second nitrogen branch line is connected to the nitrogen pipeline; one end of the crossover line is connected to the nitrogen pipeline, and the other end is connected to the central pipeline. The crossover line is provided with a crossover valve; the pump circulation line is connected to the third inlet of the adsorption tower.

[0005] Furthermore, the first outlet line is sequentially equipped with a first outlet valve, an outlet drain valve, an outlet check valve, a first outlet indicator, an outlet control valve group, and an outlet shut-off valve.

[0006] Furthermore, a second outlet valve and a second outlet indicator are sequentially installed on the second outlet line.

[0007] Furthermore, a circulation branch line is provided on the pumping circulation line, the circulation branch line is connected to the evacuation tank, and a safety valve assembly is provided on the circulation branch line.

[0008] Furthermore, the central outlet line is provided with an outlet front valve and an outlet rear valve in sequence, and an outlet safety valve is provided between the outlet front valve and the outlet rear valve, which is connected to the circulation branch line.

[0009] Furthermore, a pressure holding control valve, a shut-off valve, and a pressure holding check valve are sequentially installed on the nitrogen pressure holding line; a first pressure holding inlet valve is installed on the first nitrogen branch line; and a second pressure holding inlet valve is installed on the second nitrogen branch line.

[0010] Furthermore, a nitrogen check valve is installed on the nitrogen pipeline.

[0011] Furthermore, a first branch line and a second branch line of desorbent are provided on the main desorbent pipeline. The first branch line of desorbent is connected to the first outlet line, and the second branch line of desorbent is connected to the central pipe inlet of the adsorption tower. A desorption valve and a desorption control valve group are sequentially provided on the main desorbent pipeline.

[0012] Furthermore, a first desorption control valve group and a desorption check valve are sequentially arranged on the first branch line of the desorbent. A first inlet line, a second inlet line, and a third inlet line are arranged on the first branch line of the desorbent. The first inlet line is connected to inlet four of the adsorption tower, the second inlet line is connected to inlet five of the adsorption tower, and the third inlet line is connected to inlet six of the adsorption tower. A first inlet valve is arranged on the first inlet line, a second inlet valve is arranged on the second inlet line, and a third inlet valve is arranged on the third inlet line.

[0013] Furthermore, a second desorption control valve is sequentially installed on the second branch line of the desorbent.

[0014] The beneficial effects of this utility model are as follows: This application solves the problem that during the shutdown of the adsorption tower, the isolation valve may have internal leakage, which will cause the pressure of the central tube of the adsorption tower to be unable to be maintained. This application can completely avoid this problem, maintain the pressure of the central tube of the adsorption tower, balance the pressure of the adsorption tower and the central tube, avoid the deformation of the central tube caused by pressure imbalance and damage to the internal parts of the adsorption tower, thereby protecting the internal parts of the adsorption tower and maintaining the normal operation of the adsorption tower. Attached Figure Description

[0015] Figure 1 This is a process flow diagram of the present invention;

[0016] In the diagram: 100, Adsorption tower.

[0017] 200. Desorbent main line; 210. Desorption valve; 220. Desorption control valve assembly; 230. First branch line of desorbent; 232. First desorption control valve assembly; 233. Desorption check valve; 234. First inlet line; 2341. First inlet valve; 235. Second inlet line; 2351. Second inlet valve; 236. Third inlet line; 2361. Third inlet valve; 240. Second branch line of desorbent; 242. Second desorption control valve.

[0018] 300. First outlet line; 310. First outlet valve; 320. Outlet drain valve; 330. Outlet check valve; 340. First outlet indicator; 350. Outlet control valve assembly; 360. Outlet shut-off valve; 370. Residual liquid mixing tank.

[0019] 400. Second outlet line; 410. Second outlet valve; 420. Second outlet indicator.

[0020] 500. Center outlet line; 510. Outlet pre-valve; 520. Outlet safety valve; 530. Outlet post-valve.

[0021] 600. Nitrogen pressure holding line; 610. Pressure holding control valve; 620. Shut-off valve; 630. Pressure holding check valve; 640. First nitrogen branch line; 641. First pressure holding inlet valve; 650. Second nitrogen branch line; 651. Second pressure holding inlet valve.

[0022] 700. Nitrogen pipeline; 710. Nitrogen check valve.

[0023] 800, crossover; 810, crossover valve.

[0024] 900. Pumping circulation line; 910. Circulation branch line; 911. Safety valve.

[0025] 1000, Residual Liquid Tower. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0027] like Figure 1As shown, an embodiment of the nitrogen system for an adsorption tower 100 according to this utility model includes an adsorption tower 100, a raffinate mixing tank 370, a desorbent main pipeline 200, a first outlet line 300, a second outlet line 400, a central outlet line 500, a nitrogen pressure holding line 600, a nitrogen pipeline 700, and a cross-line and pumping circulation line 900. Valves are installed at the outlet and inlet of the raffinate mixing tank 370. The desorbent main pipeline 200 is connected to the inlet of the adsorption tower 100. One end of the first outlet line 300 is connected to the outlet of the adsorption tower 100, and the other end is connected to the raffinate tower 1000 via the raffinate mixing tank 370. One end of the second outlet line 400 is connected to the outlet of the adsorption tower 100, and the other end is connected to the first outlet. The adsorption tower 100 is connected to the adsorption tower 100 at one end and to the adsorption tower 100 at the other end. The nitrogen pressure holding line 600 comes from the nitrogen cylinder and is connected to the adsorption tower 100 at the second outlet line 400. The nitrogen pressure holding line 600 is equipped with a first nitrogen branch line 640 and a second nitrogen branch line 650. The first nitrogen branch line is connected to the adsorption tower 100 at the second inlet. The nitrogen pipeline 700 comes from the nitrogen system and is connected to the nitrogen pressure holding line 600. The second nitrogen branch line is connected to the nitrogen pipeline 700. The crossover line 800 is connected to the adsorption tower 100 at one end and to the adsorption tower 100 at the other end. The crossover line 800 is equipped with a crossover valve 810. The pump circulation line 900 is connected to the adsorption tower 100 at the third inlet.

[0028] Further optimization involves installing valves before and after the residual liquid mixing tank 370, and also installing a bypass route with valves on the bypass route.

[0029] In one embodiment, a first outlet valve 310, an outlet drain valve 320, an outlet check valve 330, a first outlet indicator 340, an outlet control valve group 350, and an outlet shut-off valve 360 ​​are sequentially arranged on the first outlet line 300.

[0030] In one embodiment, a second outlet valve 410 and a second outlet indicator 420 are sequentially provided on the second outlet line 400.

[0031] A further optimized valve is installed downstream of the second outlet indicator 420.

[0032] In one embodiment, a circulation branch line 910 is provided on the pumping circulation line 900, the circulation branch line 910 is connected to the evacuated liquid tower 1000, and a safety valve group 911 is provided on the circulation branch line 910.

[0033] It should be noted that safety valve assembly 911 is depressurized to the flare system, and a valve is installed downstream of safety valve assembly 911.

[0034] In one embodiment, the central outlet line 500 is provided with an outlet front valve 510 and an outlet rear valve 530 in sequence, and an outlet safety valve 520 is provided between the outlet front valve 510 and the outlet rear valve 530, which is connected to the circulation branch line 910.

[0035] In one embodiment, a pressure holding control valve 610, a shut-off valve 620, and a pressure holding check valve 630 are sequentially provided on the nitrogen pressure holding line 600, a first pressure holding inlet valve 641 is provided on the first nitrogen branch line 640, and a second pressure holding inlet valve 651 is provided on the second nitrogen branch line 650.

[0036] In a further optimization, a check valve is installed upstream of the pressure holding control valve 610, a valve is installed between the shut-off valve 620 and the pressure holding check valve 630, and a check valve is installed upstream of the second pressure holding inlet valve 651.

[0037] In one embodiment, a nitrogen check valve 710 is provided on the nitrogen line 700.

[0038] A further optimized downstream valve is provided for the nitrogen check valve 710.

[0039] In one embodiment, a first branch line 230 and a second branch line 240 of the desorbent are provided on the main desorbent pipeline 200. The first branch line 230 of the desorbent is connected to the first outlet line 300, and the second branch line 240 of the desorbent is connected to the central pipe inlet of the adsorption tower 100. A desorption valve 210 and a desorption control valve group 220 are sequentially provided on the main desorbent pipeline 200.

[0040] In one embodiment, a first desorption control valve group 232 and a desorption check valve 233 are sequentially arranged on the first branch line 230 of the desorbent. A first inlet line 234, a second inlet line 235 and a third inlet line 236 are arranged on the first branch line 230 of the desorbent. The first inlet line 234 is connected to the fourth inlet of the adsorption tower 100, the second inlet line 235 is connected to the fifth inlet of the adsorption tower 100, and the third inlet line 236 is connected to the sixth inlet of the adsorption tower 100. A first inlet valve 2341 is arranged on the first inlet line 234, a second inlet valve 2351 is arranged on the second inlet line 235, and a third inlet valve 2361 is arranged on the third inlet line 236.

[0041] In a further optimized configuration, valves are installed upstream of the first desorption control valve group 232, and valves are installed before and after the desorption check valve 233; upstream of the second inlet valve 2351, a drain valve, a check valve, an indicator, and a shut-off valve 620 are installed; downstream of the third inlet valve 2361, a check valve and a valve are installed; the third inlet line 236 is also provided with a branch line connecting to the third outlet line; a branch line is also provided on the first branch line 230 of the desorbent, connecting to the adsorption tower 100; the branch line is also provided with a bypass line connecting to the second inlet line 235; a check valve and a valve are installed on the branch line, and a check valve and a valve are installed on the bypass line.

[0042] In one embodiment, a second desorption control valve 242 is sequentially provided on the second branch line 240 of the desorbent.

[0043] In a further optimized configuration, a valve is installed upstream of the second desorption control valve 242, and a valve and an indicator are installed downstream of the second desorption control valve 242.

[0044] It should be noted that a drain valve is installed at the bottom of the adsorption tower 100, and the drain valve is connected to the first branch line 230 of the desorbent. An electric valve is installed at the bottom of the central pipe of the adsorption tower 100.

[0045] In the description of this utility model, it should be understood that 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", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal 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 can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

Claims

1. A nitrogen system for an adsorption tower, characterized in that: include Adsorption tower; The residual liquid mixing tank is equipped with valves at the inlet and outlet. The desorbent main pipeline is connected to inlet one of the adsorption tower; The first outlet line is connected at one end to outlet one of the adsorption tower, and at the other end to the raffinate tower through the raffinate mixing tank. The second outlet line is connected at one end to outlet two of the adsorption tower and at the other end to the first outlet line; The central outlet line is connected at one end to the central tube outlet of the adsorption tower and at the other end to the second outlet line. A nitrogen pressure holding line, originating from a nitrogen cylinder, is connected to the second outlet line. The nitrogen pressure holding line is provided with a first nitrogen branch line and a second nitrogen branch line. The first nitrogen branch line is connected to the second inlet of the adsorption tower. A nitrogen pipeline, originating from the nitrogen system, is connected to the nitrogen pressure-holding line; the second branch nitrogen pipeline is connected to the nitrogen pipeline. A crossover line is provided, with one end connected to the nitrogen pipeline and the other end connected to the central pipeline, and a crossover valve is provided on the crossover line. The pump circulation line is connected to inlet three of the adsorption tower.

2. The nitrogen system for an adsorption tower according to claim 1, characterized in that: The first outlet line is sequentially equipped with a first outlet valve, an outlet drain valve, an outlet check valve, a first outlet indicator, an outlet control valve group, and an outlet shut-off valve.

3. The nitrogen system for an adsorption tower according to claim 1, characterized in that: A second outlet valve and a second outlet indicator are sequentially installed on the second outlet line.

4. The nitrogen system for an adsorption tower according to claim 1, characterized in that: A circulation branch line is provided on the pump circulation line, the circulation branch line is connected to the residual liquid tower, and a safety valve group is provided on the circulation branch line.

5. The nitrogen system for an adsorption tower according to claim 4, characterized in that: The central outlet line is provided with an outlet front valve and an outlet rear valve in sequence, and an outlet safety valve is provided between the outlet front valve and the outlet rear valve, which is connected to the circulation branch line.

6. The nitrogen system for an adsorption tower according to claim 1, characterized in that: The nitrogen pressure holding line is sequentially equipped with a pressure holding control valve, a shut-off valve, and a pressure holding check valve. The first nitrogen branch line is equipped with a first pressure holding inlet valve, and the second nitrogen branch line is equipped with a second pressure holding inlet valve.

7. The nitrogen system for an adsorption tower according to claim 1, characterized in that: A nitrogen check valve is installed on the nitrogen pipeline.

8. The nitrogen system for an adsorption tower according to claim 1, characterized in that: The desorbent main pipeline is provided with a first desorbent branch line and a second desorbent branch line. The first desorbent branch line is connected to the first outlet line, and the second desorbent branch line is connected to the central pipe inlet of the adsorption tower. A desorption valve and a desorption control valve group are sequentially provided on the desorbent main pipeline.

9. The nitrogen system for an adsorption tower according to claim 8, characterized in that: A first desorption control valve group and a desorption check valve are sequentially arranged on the first branch line of the desorbent. A first inlet line, a second inlet line and a third inlet line are arranged on the first branch line of the desorbent. The first inlet line is connected to the fourth inlet of the adsorption tower, the second inlet line is connected to the fifth inlet of the adsorption tower, and the third inlet line is connected to the sixth inlet of the adsorption tower. A first inlet valve is arranged on the first inlet line, a second inlet valve is arranged on the second inlet line, and a third inlet valve is arranged on the third inlet line.

10. The nitrogen system for an adsorption tower according to claim 8, characterized in that: The second desorption control valve is sequentially installed on the second branch line of the desorbent.

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