Liquid-phase material adsorption bed structure and operation method thereof

Abstract

The invention discloses a liquid-phase material adsorption bed structure and an operation method thereof, the adsorption bed structure comprises at least two adsorption bed layers which are arranged side by side and are used as adsorption units, and a material passes through the two adsorption bed layers in sequence; an adsorption material introduced during adsorption treatment and a regeneration material introduced during regeneration treatment enter from the upper parts of the different adsorption bed layers, and the bottoms of the two adsorption bed layers are communicated through a pipeline. According to the invention, the problem of running loss of the adsorbent in the adsorption bed in the steam stripping and regeneration process in the prior art is solved, and the running loss adsorbent is prevented from flowing into a steam stripping system and a regeneration pipeline along with regeneration gas to wear a valve and equipment.

Description

Technical Field

[0001] The invention relates to the technical field of adsorption beds, and in particular to a liquid phase material adsorption bed structure and an operation method thereof. Background Art

[0002] The mixed C4 adsorption bed uses a fixed adsorption bed to adsorb the oxides and sulfides carried in the liquid phase mixed C4 feed. The adsorption bed is divided into two layers, upper and lower, and is filled with polar and non-polar adsorbents with a mass ratio of 20:1. There are two adsorption beds, which are regenerated alternately in a one-in-one-standby operation mode. The regeneration cycle is 48 hours. The materials entering the adsorption bed pass through the two beds in a bottom-in-up-out mode. The inlet and outlet pipelines are located on the side wall of the adsorption bed. The direction in which the materials enter the equipment is opposite to the flow direction of the materials in the bed. The regeneration process of the adsorption bed includes gas-phase C4 material stripping and hot nitrogen purging. The stripping unit consists of a mixed C4 storage tank, a one-in-one-standby stripping C4 delivery pump, a C4 vaporizer with a heat source of 0.46Mpa steam, and a recycled material cooler with a cold source of circulating water. The recovered materials are discharged through the pump outlet pipeline. The C4 flow rate of stripping is 41700kg / h during normal use. When not in use, the material in the stripping system circulates automatically at a small flow rate. Hot nitrogen purge flow rate is 17000Nm 3 / h, the stripping and nitrogen regeneration pipelines of the adsorption bed adopt a top-in and bottom-out mode, the inlet and the material outlet during normal operation share a manifold, and the outlet is at the bottom of the entire adsorption bed and directly facing the bed layer.

[0003] The following problems may be encountered during normal production: During the stripping and nitrogen purging process, because both the stripping gas and the regeneration gas are in the gas phase and have a high flow rate, the damaged adsorbent powder in the bed will be carried to the bottom of the adsorption bed and follow the gas into the stripping system and regeneration pipeline, causing wear on the valve sealing surfaces along the way. This will cause material leakage due to poor sealing of the valves on the regeneration pipeline during normal operation of the adsorption bed. At the same time, the adsorbent powder entering the stripping system will cause blockage of the pump inlet filter and equipment wear. Summary of the invention

[0004] In order to solve the defects of the prior art, the main purpose of the present invention is to provide a liquid material adsorption bed structure and an operation method thereof, so as to solve the problem of adsorbent loss in the adsorption bed during stripping and regeneration in the prior art.

[0005] To achieve the above-mentioned purpose of the invention, the present invention provides a liquid-phase material adsorption bed structure, comprising at least two adsorption beds arranged in parallel as adsorption units, the material passes through the two adsorption beds in sequence, and the adsorption material introduced during the adsorption treatment and the regeneration material introduced during the regeneration treatment enter from the top of different adsorption beds, and the two adsorption beds are connected at the bottom by a pipeline.

[0006] Furthermore, the material side outlet and the regeneration side outlet of the adsorption bed are respectively provided with respective filters, and the material and the regeneration gas in the adsorption bed operation state and the regeneration state respectively pass through the adsorption bed and then enter the filter.

[0007] Furthermore, the adsorption bed comprises a plurality of adsorption units connected in parallel and arranged in upper and lower positions or left and right positions, and each adsorption unit comprises at least two adsorption beds connected in series and arranged in parallel.

[0008] Furthermore, the inlet for the adsorption material or the regeneration material to enter the adsorption bed or the outlet for the adsorption bed to be discharged are both arranged at the upper part of the adsorption bed.

[0009] Furthermore, cross-line valves are provided on the material pipeline and regeneration material pipeline connected to the adsorption bed, as well as the material side outlet filter and the regeneration side outlet filter, for controlling the entry or cutting off of materials in the adsorption bed and the filter. When the adsorption effect deteriorates or the filter is clogged, any equipment can be cut out for maintenance and cleaning by crossing the line.

[0010] Furthermore, it also includes a material inlet assembly pipeline and a material outlet assembly pipeline connected to the adsorption bed for use during adsorption operation, as well as a stripping material inlet pipeline, a regeneration nitrogen feed pipeline, a regeneration nitrogen discharge pipeline and a regeneration stripping material discharge pipeline for regeneration.

[0011] Furthermore, a pressure charging pipeline and a pressure relief pipeline are arranged on the top of the adsorption bed, and an independent pressure relief valve is arranged on the top of each adsorption bed for simultaneously charging and releasing the pressure of the adsorption bed.

[0012] Furthermore, a liquid guide line and a residual liquid discharge line are arranged at the bottom of the adsorption bed layer, so that the two adsorption beds can be simultaneously guided during switching, and the residual liquid in the two beds can be discharged before stopping.

[0013] Furthermore, a pressure gauge is provided on the top of each adsorption bed to monitor the pressure of multiple adsorption beds in operation and regeneration states, and to determine the damage of the adsorbent in two or more beds by calculating the dynamic pressure difference.

[0014] Furthermore, the adsorption unit comprises a first adsorption bed and a second adsorption bed arranged in parallel, the first adsorption bed is connected to a first filter, and the second adsorption bed is connected to a second filter.

[0015] A second aspect of the present invention provides a method for operating a liquid phase material adsorption bed structure, comprising the following steps:

[0016] When the adsorption bed is in normal use, the material passes through the first filter from the top of the first adsorption bed from top to bottom, then enters the second adsorption bed through the bottom connecting pipeline, passes through the second adsorption bed from bottom to top and enters the next adsorption bed through the discharge line at the top of the second adsorption bed, and flows out from the top of the last adsorption bed after multiple adsorptions in series;

[0017] During the regeneration process, the stripping material or nitrogen enters from the top of the last adsorption bed, passes through the inside of the last adsorption bed and the bottom connecting pipe in turn, and then enters from the top of the previous adsorption bed. After multiple regenerations in series, it flows out from the top of the first adsorption bed.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] Through the adsorption bed structure of the present invention, two parallel adsorption beds are adopted, so that the inlet and outlet of the material and the regeneration gas are placed on the upper part of the adsorption bed, which avoids the high-velocity regeneration gas from passing through the bed from top to bottom to entrain the adsorbent powder, and prevents the adsorbent powder from being lost along with the regeneration gas. The vertically placed higher adsorption bed is further split into two parallel beds to reduce the pressure drop of the material passing through. Further, series-parallel connection and the provision of front and rear filters, cross-line valves and other means are adopted, so that any device can be cut out for maintenance if there is a problem, and it does not affect the overall operation. And the present invention can arbitrarily increase series-parallel equipment according to the above form according to demand to meet production needs.

[0020] Therefore, the adsorption bed structure and regeneration material flow mode of the present invention can solve the problem of adsorbent loss in the adsorption bed during the stripping and regeneration process in the prior art, and prevent the damaged adsorbent from flowing into the stripping system and regeneration pipeline with the regeneration gas flow to wear valves and equipment.

[0021] Other features and advantages of the present invention will be described in detail through the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of a liquid phase material adsorption bed structure according to an example of the present invention.

[0024] The markings are as follows: 101-material inlet assembly pipeline, 102-material outlet assembly pipeline, 103-regeneration stripping material inlet pipeline, 104-regeneration nitrogen feed pipeline, 105-regeneration nitrogen discharge pipeline, 106-regeneration stripping material discharge pipeline, 107-regeneration discharge line between double valves, 108-regeneration feed line between double valves, 109-adsorption bed charging pipeline, 110-adsorption bed pressure relief pipeline, 111-adsorption bed liquid guide line, 112-adsorption bed residual liquid discharge line, 201, 202-adsorption bed, 203, 204-filter, 301 , 302-pressure gauge, 401-regeneration nitrogen feed valve, 402-regeneration feed second valve, 403-stripping feed valve, 404-regeneration line double valve inter-discharge valve, 405-regeneration discharge first valve, 406-regeneration nitrogen discharge valve, 407-stripping feed valve, 408-regeneration discharge line double valve discharge valve, 409-adsorption bed regeneration cross-line valve, 410-regeneration line outlet filter cross-line valve, 411-adsorption bed cross-line valve, 412-adsorption bed outlet filter cross-line valve, 413, 414-gas-phase connecting valve at the top of the adsorption bed layer, 415-adsorption bed bottom drain valve. DETAILED DESCRIPTION

[0025] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0027] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] refer to Figure 1The present invention provides a liquid phase material adsorption bed structure, comprising at least two adsorption beds arranged in parallel as adsorption units, such as Figure 1 The two adsorption beds (201 and 202) shown in the figure, the materials pass through the two adsorption beds in sequence, and the adsorption materials introduced during the adsorption treatment and the regeneration materials introduced during the regeneration treatment enter from the top of different adsorption beds, and the two adsorption beds are connected at the bottom through a pipeline, for example, through Figure 1 Connect the connecting pipe shown.

[0029] In a specific embodiment, the material side outlet and the regeneration side outlet of the adsorption bed are respectively provided with respective filters, for example Figure 1 In the filters (203 and 204) shown, the material and the regeneration gas respectively pass through the adsorption bed layer and enter the filter when the adsorption bed is in operation and in regeneration state.

[0030] Compared with the prior art, the present application adopts two adsorption beds placed in parallel with series feeding, which effectively avoids the regeneration gas from the top and bottom of the single bed in the prior art carrying the adsorbent powder into the regeneration pipeline and system. At the same time, compared with the prior art, the adsorption bed of the present application is more flexible to use, and more identical beds can be connected in series or in parallel as needed to meet the adsorption requirements.

[0031] In a specific embodiment, the adsorption bed comprises a plurality of adsorption units connected in parallel and arranged in vertical or horizontal positions, and each adsorption unit comprises at least two adsorption beds connected in series and arranged in parallel. Figure 1 A set of adsorption units in the figure only illustrates two adsorption beds. If necessary, more adsorption beds can be added in the same form. If necessary, more adsorption beds can be added in the same arrangement.

[0032] In a specific embodiment, the inlet for the adsorption material or the regeneration material to enter the adsorption bed or the outlet for the adsorption bed to be discharged are both arranged at the upper part of the adsorption bed.

[0033] In a specific embodiment, cross-line valves (409, 410, 411, 412) are provided on the material pipeline and regeneration material pipeline connected to the adsorption bed, as well as the material side outlet filter and the regeneration side outlet filter, for controlling the commissioning or cutting out of the adsorption bed and the filter. When the adsorption effect deteriorates or the filter is clogged, any equipment can be cut out for maintenance and cleaning by crossing the line.

[0034] In a specific embodiment, it also includes a material inlet assembly pipeline (101) and a material outlet assembly pipeline (102) connected to the adsorption bed for use during adsorption operation, as well as a stripping material inlet pipeline (103), a regeneration nitrogen feed pipeline (104), a regeneration nitrogen discharge pipeline (105) and a regeneration stripping material discharge pipeline (106) for use during regeneration.

[0035] In a specific embodiment, an adsorption bed pressurizing pipeline and a pressure relief pipeline 109 and 110 are arranged on the top of the adsorption bed, which are used for pressure charging and pressure relief operations during the switching process of two mixed C4 adsorption beds, and each adsorption bed is provided with independent gas phase connecting valves 413 and 414 on the top to prevent the materials from flowing through the tops of the two beds during the operation and regeneration of the adsorption beds. When pressure charging and pressure relief are required, the two valves are opened at the same time to charge and release the pressure of the two beds at the same time.

[0036] In a specific embodiment, the present invention further provides a discharge line 107 between the double valves of the regeneration discharge line and a discharge line 108 between the double valves of the regeneration feed line, which are connected to the main discharge pipe of the device. When the regeneration pipeline is not in use, the discharge valves 404 and 408 on the discharge line are opened to discharge the remaining materials between the double valves. At the same time, the materials can be discharged in time when the front and rear valves leak, avoiding the risk of overpressure between the double valves.

[0037] In a specific embodiment, a liquid guide line 111 and a residual liquid discharge line 112 are provided at the bottom of the adsorption bed layer, so that liquid can be simultaneously guided to the two adsorption beds when a single adsorption bed is cut out for regeneration, and residual liquid in the two beds can be discharged before shutdown. A liquid discharge valve 415 at the bottom of the adsorption bed is provided on the liquid discharge main pipe to ensure that the two beds are always in a connected state.

[0038] In a specific embodiment, in order to monitor whether the pressure drop during normal operation and regeneration meets the requirements, pressure gauges (301 and 302) are set on the top of each adsorption bed to monitor the pressure of multiple adsorption beds during operation and regeneration, and to determine the damage of the adsorbent in two or more beds by calculating the dynamic pressure difference.

[0039] Understandably, Figure 1 A total of four groups of adsorption beds arranged in series and parallel are provided in the form of A / B / C / D, which can be freely selected according to the feed form and can also be used in series or parallel. When any adsorption bed or filter reaches saturation, it can be cut out through the front and rear manual valves and cross-line without affecting the continuity of production operation. At the same time, the above forms can be used to increase the number of series and parallel equipment as needed, not limited to four groups. Figure 1 The letters (A / B / C / D) following the digital mark do not affect the marking description. For example, the marking descriptions of 201 (A / B / C / D) and 201 are consistent, and both are adsorption beds.

[0040] Reference Figure 1 The second aspect of the present invention provides a method for operating a liquid phase material adsorption bed structure, comprising the following steps:

[0041] During normal operation, the material passes through the material feed assembly pipeline 101, through the filter 203, through the first adsorption bed from top to bottom from the upper bend of the first adsorption bed, and then enters the second parallel adsorption bed through the bottom connecting pipe, passes through the second adsorption bed from bottom to top and enters the next adsorption bed through the discharge line at the top of the second adsorption bed. After multiple adsorptions in series, it flows out through the material outlet assembly pipeline 102. If a single adsorption bed can meet the demand, the remaining equipment in the series system can be bypassed.

[0042] The material flow direction during regeneration is opposite to that during operation. During stripping, the heated gas phase C4 enters the adsorption bed from the upper part of the second adsorption bed through the feed valve 401 and the second feed valve 402, and flows back to the stripping system from the top of the first adsorption bed through the discharge valve 405 and the discharge valve 406 after passing through the second adsorption bed and the connecting pipe. The nitrogen regeneration process after stripping closes the feed valve 401 and the discharge valve 406, opens the feed valve 403 and the discharge valve 407, and establishes a nitrogen regeneration process with the same material flow direction as the stripping material. If the load is too large for a single device to meet the adsorption requirements, the parallel adsorption bed process can be opened, and the flow of materials and regeneration gas can be carried out by connecting two devices in parallel.

[0043] The present invention is further described below with reference to the accompanying drawings and embodiments:

[0044] Example 1

[0045] The entire implementation process of the mixed C4 adsorption bed includes the entire process of pressurization, liquid conduction, liquid replenishment, parallel operation, switching, liquid discharge, residual liquid discharge, stripping, and regeneration. It can be operated by a single unit or multiple units, and can also be used simultaneously.

[0046] like Figure 1 As shown, when the adsorption bed needs to be pressurized, ensure that the other valves are in the closed state, open the 109 charging pipeline process and open the 409 and 410 valves to pressurize the two bed layers of the adsorption bed at the same time, when the pressure reaches the required level, close the relevant valves on the 109 charging pipeline process, open the 110 pressure relief pipeline process to connect the adsorption bed with the liquid discharge tank, and after the pressure is balanced, open the 411 valve and open the 111 liquid guide pipeline process to guide the adsorption bed.

[0047] After both bed layers of the adsorption bed are filled with liquid and the liquid conduction is completed, valves 409, 410 and 411 are closed, and pipeline process 101 is opened to fill the adsorption bed with liquid. After the liquid is filled, pipeline process 102 is opened to allow the material to flow through the adsorption bed normally and put into use.

[0048] For the adsorption bed that has reached the service life limit, first close the 101 and 102 pipeline processes to deactivate the adsorption bed, then open the 409, 410, 411 valves and open the 110 and 111 pipeline processes to drain the liquid in the adsorption bed. After the liquid is drained, close the 111 pipeline process and open the 112 pipeline to drain the residual liquid in the adsorption bed. After all the liquid is drained, close the 411 valve and release the pressure on the adsorption bed through the top 110 line.

[0049] After the pressure is released, the adsorption bed closes valves 409 and 410, opens the feed valve 401 and the second feed valve 402 on the stripping line 103, and opens the first discharge valve 405 and the discharge valve 406 on the stripping line 106 to strip the adsorption bed. After the stripping of the two beds is completed, close valves 401 and 406, open valves 403 on the 104 pipeline and valve 407 on the 105 pipeline to introduce nitrogen to regenerate the two beds. After the regeneration is completed, the adsorption bed is kept under pressure for standby use.

[0050] Compared with the prior art, the present invention adopts two parallel adsorbent beds, so that the inlet and outlet of the material and the regeneration gas are placed on the upper part of the adsorption bed, avoiding the high-velocity regeneration gas from top to bottom through the bed to entrain the adsorbent powder, and preventing the adsorbent powder from being lost with the regeneration gas. At the same time, the vertically placed higher adsorption bed is split into two parallel beds to reduce the pressure drop of the material passing through. At the same time, series-parallel connection and the setting of front and rear filters, cross-line valves and other means are adopted, so that any equipment can be cut out for maintenance if there is a problem, and it does not affect the overall operation.

[0051] During the implementation of the present invention, the number of series-parallel adsorption beds can be increased as needed. Figure 1 Only two units are shown in series and two in parallel. The related discharge tanks, discharge pumps, and unmarked pipeline processes have little advantage over the prior art. With reference to the conventional technology in this field, no further details are given here.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to list all implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are within the spirit scope of the present invention.

Claims

1. A liquid phase material adsorption bed structure, characterized in that: It comprises at least two adsorption beds arranged in parallel as an adsorption unit, the materials pass through the two adsorption beds in sequence, and the adsorption materials introduced during the adsorption treatment and the regeneration materials introduced during the regeneration treatment enter from the top of different adsorption beds, and the two adsorption beds are connected at the bottom through a pipeline.

2. The adsorption bed structure according to claim 1, characterized in that: The material side outlet and the regeneration side outlet of the adsorption bed are respectively provided with respective filters, and the material and the regeneration gas in the adsorption bed operation state and the regeneration state respectively pass through the adsorption bed and then enter the filter.

3. The adsorption bed structure according to claim 1 or 2, characterized in that: The adsorption bed layer comprises a plurality of adsorption units which are connected in parallel and arranged in upper and lower positions or left and right positions, and each adsorption unit comprises at least two adsorption beds which are arranged in parallel and connected in series.

4. The adsorption bed structure according to claim 1, characterized in that: The inlet for the adsorption material or the regeneration material to enter the adsorption bed layer or the outlet for the adsorption bed layer to be discharged are both arranged at the upper part of the adsorption bed layer.

5. The adsorption bed structure according to any one of claims 1 to 4, characterized in that: The material pipeline and regeneration material pipeline connected to the adsorption bed, as well as the material side outlet filter and the regeneration side outlet filter are all equipped with cross-line valves for controlling the entry or cut-off of materials in the adsorption bed and the filter.

6. The adsorption bed structure according to claim 1, characterized in that: It also includes a material inlet assembly pipeline and a material outlet assembly pipeline connected to the adsorption bed for use during adsorption operation, as well as a stripping material inlet pipeline, a regeneration nitrogen feed pipeline, a regeneration nitrogen discharge pipeline and a stripping material discharge pipeline for regeneration.

7. The adsorption bed structure according to claim 1, characterized in that: A pressure charging pipeline and a pressure relief pipeline are arranged on the top of the adsorption bed, and an independent pressure relief valve is arranged on the top of each adsorption bed to charge and release the pressure of the adsorption bed at the same time; and / or, A liquid guide line and a residual liquid discharge line are arranged at the bottom of the adsorption bed layer, which are used to guide liquid to the two adsorption beds at the same time when switching, and to discharge residual liquid in the two adsorption beds before stopping.

8. The adsorption bed structure according to claim 1, characterized in that: A pressure gauge is arranged on the top of each adsorption bed to monitor the pressure of multiple adsorption beds in operation and regeneration state, and to judge the damage of adsorbent in two or more adsorption beds by calculating the dynamic pressure difference.

9. The adsorption bed structure according to any one of claims 1 to 8, characterized in that: The adsorption unit comprises a first adsorption bed and a second adsorption bed arranged in parallel, the first adsorption bed is connected to a first filter, and the second adsorption bed is connected to a second filter.

10. A method for operating the liquid-phase material adsorption bed structure according to any one of claims 1 to 9, characterized in that: The steps include: When the adsorption bed is in normal use, the material passes through the first filter from the top of the first adsorption bed from top to bottom, then enters the second adsorption bed through the bottom connecting pipeline, passes through the second adsorption bed from bottom to top and enters the next adsorption bed through the discharge line at the top of the second adsorption bed, and flows out from the top of the last adsorption bed after multiple adsorptions in series; During the regeneration process, the stripping material or nitrogen enters from the top of the last adsorption bed, passes through the inside of the last adsorption bed and the bottom connecting pipe in turn, and then enters from the top of the previous adsorption bed. After multiple regenerations in series, it flows out from the top of the first adsorption bed.

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