Measuring tool for wall flow of reactor

Abstract

The utility model relates to a reactor wall flow measuring tool, the tool comprises a separator and a sampling disc, the separator is installed at the outlet position of a reactor, the separator comprises a flow guide ring and a grating net, the grating net is provided with the flow guide ring, the flow guide ring comprises an upper flow guide ring and a lower flow guide ring, and the sampling disc is arranged on the upper flow guide ring and the lower flow guide ring. One end of the upper flow guide ring is connected with the grating net, the other end of the upper flow guide ring upwards extends into a catalyst bed channel of the reactor, one end of the lower flow guide ring is connected with the grating net, the other end of the lower flow guide ring downwards is connected with the sampling disc, the grating net is filled with a catalyst, and the sampling disc is provided with a positioning ring table. The sampling disc is connected with the lower flow guide ring through a positioning ring table, and a liquid loading area of the sampling disc is divided into a material liquid area which flows in the center of a catalyst bed layer and adheres to the wall by the positioning ring table. Compared with the prior art, the device can accurately measure the flow of the liquid flowing in the catalyst bed layer in a wall-adhering manner.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of chemical reactor, and relates to a measuring tool for the wall flow of a reactor. BACKGROUND

[0002] The trickle bed reactor is mainly applied in the oil refining industry, and its working principle is that gas-liquid phase feed liquid is injected from a feed pipe at the upper end of the reactor, is uniformly sprayed and distributed to the upper end position of the catalyst bed layer by a distributor, a gas-liquid-solid three-phase reaction occurs on the surface of the catalyst bed layer, and finally the raw material and the product flow out through the lower end outlet position.

[0003] However, even if the gas-liquid phase feed liquid at the upper end position is uniformly distributed into the catalyst, because of the different surface tension of the catalyst surface and the wall surface, the liquid phase feed liquid will still flow along the wall after flowing a certain distance in the catalyst bed layer, and once the liquid phase feed liquid is unevenly distributed in the catalyst bed layer, the phenomenon of local incomplete wetting of the catalyst will be caused, the reaction process is insufficient and uneven, and then the rate and conversion rate of the reaction process are affected, and at the same time, channeling and hot spots are formed in the local catalyst bed layer, which seriously affects the service life of the catalyst. Therefore, for the trickle bed reactor, because of the liquid phase wall effect, even if the inlet is uniformly distributed, the uniform mixing and reaction of the gas-liquid-solid three-phase at the deep part of the bed layer cannot be guaranteed, and it is necessary to study the position of the liquid phase feed liquid flowing along the wall in the bed layer.

[0004] Patent CN101279228A discloses a gas-liquid distributor of a trickle bed reactor, gas phase channel pipelines and liquid phase channel pipelines are designed on the distribution plate, and the gas-liquid distributor is composed of uniformly opened holes on the cross sections at different axial positions, which can better solve the problems of uneven fluid distribution in the catalyst bed layer, poor trickle effect and poor catalyst reaction efficiency, but when the wall material changes the surface tension of the liquid and the operating conditions change, the uniform distribution of the gas-liquid in the catalyst bed layer cannot be guaranteed. At the same time, when the height of the catalyst bed layer is increased, the wall effect of the liquid phase will be more serious, and therefore it is necessary to detect the wall flow of the trickle bed reactor and better design the structure of the gas-liquid distributor according to different operating conditions.

[0005] Patent CN111375348A discloses a fixed bed upflow reactor and its application, the reactor includes reactor shell, support grid is arranged in the reactor shell along the material flow direction, lower catalyst bed, sliding grid layer, upper catalyst bed, gland grid; the reactor shell bottom is provided with a reaction material inlet, the reactor shell top is provided with a reaction material outlet, the sliding grid layer includes an upper sliding grid and a lower sliding grid; the reactor can also be provided with a catalyst dust filter layer and a gland. But the grid in this patent only plays a supporting and protecting role of the catalyst, and the gas-liquid mixed state and uniformity of the material entering and leaving the reactor cannot be detected, so it is necessary to detect the flow state of the reactor material liquid.

[0006] Patent CN1640536A discloses a gas-liquid-solid composite reactor device, which comprises a gas-liquid cyclone, a sprayer, a sieve plate, a loop reactor and a gas distributor; the reactor top is provided with a gas-liquid cyclone, the separated liquid enters the reactor and is sprayed by the sprayer, and the reactor bottom is also designed as an inverted cone. Although this structure realizes the full contact of the gas-liquid-solid three phases at the reactor inlet position, the liquid phase will always tend to flow along the wall surface due to the different surface tensions of the reaction material liquid on the catalyst and the reactor wall surface, which is not conducive to the full utilization of the catalyst. Therefore, it is necessary to design a wall flow detection tool to provide a reference for further optimizing the distributor and the reactor structure. Utility model content

[0007] Whether the material liquid and the catalyst in the trickle bed reactor are fully contacted directly affects the fullness of the reaction process and the service life of the catalyst, so it is very important to accurately measure the wall liquid flow in the bed. The purpose of the present utility model is to overcome at least one of the defects in the prior art and provide a reactor wall flow measurement tool, which can accurately measure the liquid flow of the catalyst bed adhering to the wall.

[0008] The purpose of the present utility model can be achieved by the following technical solutions:

[0009] One of the technical solutions of the present utility model is to provide a reactor wall flow measurement tool, which comprises a separator and a sampling disc, the separator is installed at the outlet position of the reactor, the separator comprises a flow guide ring and a grid, the grid is provided with a flow guide ring, the flow guide ring comprises an upper flow guide ring and a lower flow guide ring, one end of the upper flow guide ring is connected with the grid, the other end extends into the catalyst bed channel of the reactor upward, one end of the lower flow guide ring is connected with the grid, the other end is connected with the sampling disc downward,

[0010] The reactor is a gas-liquid-solid three-phase reactor, the outlet of the reactor is a gas-liquid mixed phase, only the liquid phase ratio is low at the middle position of the outlet, and the liquid phase ratio is high at the wall-attached position, and the liquid flows in the central and wall-attached catalyst bed are separated at the position of the upper flow guide ring during the reaction,

[0011] The catalyst is uniformly filled on the grid net, the grid net can ensure the smooth flow of the gas-liquid phase liquid and can support and protect the catalyst bed,

[0012] The sampling disc is provided with a positioning ring table, the sampling disc is connected with the lower flow guide ring through the positioning ring table, and the liquid loading area of the sampling disc is divided into liquid areas flowing in the central and wall-attached catalyst bed through the positioning ring table. When measuring the wall flow, the wall flow ratio can be calculated by sampling and weighing at the lower end outlet position of the reactor through the sampling disc.

[0013] Further, the radial position of the flow guide ring is adjustable, and the liquid flow at different positions can be measured for different catalysts. The distance between the flow guide ring and the wall surface of the reactor is 0.01-0.25 times the diameter of the reactor cylinder.

[0014] Further, the setting direction of the flow guide ring is vertical, and the extension length of the upper flow guide ring is 0.1-2 times the diameter of the reactor cylinder.

[0015] The end of the upper flow guide ring is chamfered by 5-60°, and the chamfered high position is close to the wall surface of the reactor, which is more conducive to the uniform transition of the liquid phase at this position and reduces the error in the experiment process.

[0016] Further, the lower flow guide ring is connected with the positioning ring table of the sampling disc through buckles.

[0017] Further, the grid net comprises an outer grid net and an inner grid net, the outer grid net is located outside the flow guide ring, and the inner grid net is located inside the flow guide ring.

[0018] As a preferred technical solution, the material of the grid net is metal, the aperture size and thickness are adjustable, and the suitable grid net support form can be matched for different catalyst sizes, the opening size is 1-10 mm, and the opening form is selected from a circular hole or a square hole.

[0019] Further, the separator further comprises a support frame, the grid net is arranged in the support frame, the outer grid net is located between the support frame and the flow guide ring, and the inner grid net is located in the region surrounded by the flow guide ring.

[0020] As a preferred technical solution, the separator composed of the support frame, the flow guide ring and the grid net adopts an integrated structure, which is compact in structure, convenient to install and good in sealing performance.

[0021] Further, the separator is installed at the outlet position of the reactor by flange sheets.

[0022] Further, the flange sheets comprise upper flange sheets and lower flange sheets, the support frame and the grid net are arranged between the upper flange sheets and the lower flange sheets, the upper flow guide ring extends into the catalyst bed channel of the reactor upwards after passing through the upper flange sheets, and the lower flow guide ring is connected with the sampling disc downwards after passing through the lower flange sheets.

[0023] Further, the sampling position of the sampling disc is adjustable in height, and the sampling disc can be matched with the appropriate placement position according to different working conditions and different flow parameters, and the distance between the lower flange sheet and the sampling disc is 0.1-2 times the diameter of the reactor cylinder.

[0024] Further, the support frame and the grid net are connected through the upper flange sheets and the lower flange sheets, the upper flange sheets are connected with the outlet position of the reactor through welding, and the upper flange sheets and the lower flange sheets are connected through bolts to realize the fastening and sealing effect.

[0025] As a preferred technical solution, the outlet position of the feed pipe of the reactor is provided with an atomizing sprayer, and the reactor is provided with a distributor below the feed pipe and above the catalyst bed, so that the atomizing sprayer and the distributor can ensure that the gas-liquid phase feed liquid can be uniformly distributed at the upper end position of the catalyst bed, and the test error caused by uneven initial distribution of the liquid phase and the gas phase can be avoided.

[0026] As a preferred technical solution, the height of the catalyst bed is adjustable in sections, and the wall flow of the trickle bed at different heights can be measured, and the height of the catalyst bed is 1-10m.

[0027] As a preferred technical solution, the outer wall surface of the catalyst bed is arranged by a plurality of plate pieces at equal intervals, each plate piece pair comprises two plate pieces, the side edges of the two plate pieces are fixedly connected to form a cavity with an upper opening and a lower opening, the plate piece shape adopts a rectangular plate, and the plate piece form is selected from a bubble plate, a flat plate or a corrugated plate.

[0028] As a preferred technical solution, the reactor is selected from a plate-type trickle bed reactor or a shell-and-tube trickle bed reactor.

[0029] One of the technical solutions of the utility model discloses a kind of measurement methods of reactor wall flow, using the tool described in measurement, this method comprises the following steps:

[0030] When the reactor is started, the gas-liquid phase feed liquid is injected from the feed pipe at the upper end of the reactor, and after passing through the atomizing sprayer and the distributor, the gas-liquid phase feed liquid is uniformly distributed into the catalyst bed. Due to the difference in the surface tension properties of the catalyst and the liquid on the reactor wall, the liquid phase feed liquid has a tendency to flow along the gap on the reactor wall after flowing to a certain position in the catalyst bed. When the feed liquid flows to the position at the lower end of the bed, the upper flow guide ring separates the central flow and the wall flow of the feed liquid in the catalyst bed. At the outlet position, the central flow and the wall flow of the bed liquid flow into different areas of the sampling tray, and the proportion of the wall flow of the bed liquid can be calculated by counting the weight.

[0031] Compared with the prior art, the utility model has the following beneficial effects:

[0032] (1) The utility model discloses an integrated structure of support frame, flow guide ring and grating net, which realizes the support and sealing effect of the catalyst bed and the measurement process of the wall flow in the bed.

[0033] (2) The radial position of the flow guide ring in the utility model is adjustable, which can be realized by only replacing the support frame with different flow guide ring positions.

[0034] (3) The wall flow measurement tool has the characteristics of adjustable grating opening size, adjustable radial position of the flow guide ring, integrated design of the support frame and the flow guide ring, simple installation, compact structure, good sealing performance, wide applicable flow range, no influence on the normal operation of the reactor and the like. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a sectional view structural schematic diagram of the reactor wall flow measurement tool in the embodiment of the utility model.

[0036] Figure 2 It is a top view structural schematic diagram of the separator in the embodiment of the utility model.

[0037] MARKED DESCRIPTION IN THE DRAWING:

[0038] 1 - separator, 1.1 - support frame, 1.2 - upper flow guide ring, 1.3 - lower flow guide ring, 1.4 - outer grating net, 1.5 - inner grating net, 2 - upper flange sheet, 3 - lower flange sheet, 4 - sampling tray, 5 - catalyst bed channel, 6 - reactor, 7 - distributor, 8 - atomizing sprayer. DETAILED DESCRIPTION

[0039] The utility model will be described in detail below in combination with specific embodiments. The embodiments are implemented on the premise of the technical scheme of the utility model, and detailed implementation modes and specific operation processes are given, but the protection scope of the utility model is not limited to the following embodiments.

[0040] In the description of the utility model, it should be pointed out that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are used to describe common objects, and only indicate different instances of the same object, and do not imply that the objects thus described must be in a given order, whether in time, space, sequence or any other manner.

[0041] In the description of the utility model, it should be pointed out that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0042] Embodiment:

[0043] A reactor wall flow measuring tool is not only limited to plate trickle bed reactors, but can also be used to measure wall flow in shell-and-tube trickle bed reactors, as shown in Figs. Figure 1 and Figure 2 The utility model discloses a kind of reactor wall flow measuring tools, including separator 1 and sampling disc 4, separator 1 is installed in the outlet position of reactor 6, separator 1 includes flow guide ring and grid, grid is provided with flow guide ring, flow guide ring includes upper flow guide ring 1.2 and lower flow guide ring 1.3, one end of upper flow guide ring 1.2 is connected with grid, the other end is inserted into catalyst bed channel 5 of reactor 6 upwards, one end of lower flow guide ring 1.3 is connected with grid, the other end is connected with sampling disc 4 downwards,

[0044] Gas-liquid-solid three-phase reaction occurs in reactor 6, the outlet position of reactor 6 is all gas-liquid mixed phase, only liquid phase proportion is low in the middle position of outlet, liquid phase proportion is high in outlet wall sticking position, central and wall sticking flow of catalyst bed in reaction process liquid flow to upper flow guide ring 1.2 position will be separated,

[0045] The grid net uniformly stacks the catalysts, and the grid net can ensure the smooth flow of gas-liquid phase feed liquid and protect the catalyst bed,

[0046] The sampling disc 4 is provided with a positioning ring table, and the sampling disc 4 is connected with the lower flow guide ring 1.3 through the positioning ring table. The liquid loading area of the sampling disc 4 is divided into a central catalyst bed and a wall-adhering liquid area through the positioning ring table. When measuring the wall flow, the wall flow proportion can be calculated by sampling and weighing at the lower end outlet position of the reactor 6 through the sampling disc 4.

[0047] The radial position of the flow guide ring is adjustable, and the liquid flow at different positions can be measured for different catalysts. The distance between the flow guide ring and the wall surface of the reactor 6 is 0.01-0.25 times the diameter of the reactor 6 cylinder, and in this embodiment, it is preferably 0.1 times.

[0048] The setting direction of the flow guide ring is vertical, and the extension length of the upper flow guide ring 1.2 is 0.1-2 times the diameter of the reactor 6 cylinder, and in this embodiment, it is preferably 0.2 times.

[0049] The end of the upper flow guide ring 1.2 is chamfered by 5-60°, and the chamfered high position is close to the wall surface of the reactor 6, which is more conducive to the uniform transition of the liquid phase at this position and reduces the error in the experimental process. In this embodiment, it is preferably chamfered by 45°.

[0050] The lower flow guide ring 1.3 is connected with the positioning ring table of the sampling disc 4 through buckles;

[0051] The grid net includes an outer grid net 1.4 and an inner grid net 1.5. The outer grid net 1.4 is located outside the flow guide ring, and the inner grid net 1.5 is located inside the flow guide ring.

[0052] The material of the grid net is metal, and the aperture size and thickness are adjustable. The grid net can be matched with a suitable support form according to the size of different catalysts. The opening size is 1-10 mm, and the opening form is selected from a circular hole or a square hole. In this embodiment, the square hole with a size of 1 mm is preferred.

[0053] The separator 1 further includes a support frame 1.1, and the grid net is arranged in the support frame 1.1. The outer grid net 1.4 is located between the support frame 1.1 and the flow guide ring, and the inner grid net 1.5 is located in the region surrounded by the flow guide ring.

[0054] The separator 1 composed of the support frame 1.1, the flow guide ring and the grid net is selected to have an integrated structure, which is compact, easy to install and good in sealing performance.

[0055] The separator 1 is installed at the outlet position of the reactor 6 through flanges;

[0056] The flange sheets include an upper flange sheet 2 and a lower flange sheet 3, the support frame 1.1 and the grid net are arranged between the upper flange sheet 2 and the lower flange sheet 3, the upper flow guide ring 1.2 extends into the catalyst bed channel 5 of the reactor 6 after passing through the upper flange sheet 2, and the lower flow guide ring 1.3 is connected with the sampling disc 4 after passing through the lower flange sheet 3;

[0057] The sampling position of the sampling disc 4 is adjustable in height, and the appropriate placement position can be matched according to different working conditions and different flow parameters, the distance between the lower flange sheet 3 and the sampling disc 4 is 0.1-2 times the diameter of the reactor 6 cylinder, and in the embodiment, it is preferably 0.5 times;

[0058] The support frame 1.1 and the grid net are connected through the upper flange sheet 2 and the lower flange sheet 3, the upper flange sheet 2 is connected with the outlet position of the reactor 6 through welding, and the upper flange sheet 2 and the lower flange sheet 3 are connected through bolts to realize the fastening and sealing effect;

[0059] The outlet position of the feed pipe of the reactor 6 is provided with an atomizing sprayer 8, and the reactor 6 is provided with a distributor 7 below the feed pipe and above the catalyst bed, so that the atomizing sprayer 8 and the distributor 7 can ensure that the gas-liquid phase feed liquid can be uniformly distributed at the upper end position of the catalyst bed, so as to avoid test errors caused by uneven initial distribution of liquid phase and gas phase;

[0060] The height of the catalyst bed is adjustable in sections, and the wall flow of the trickle bed at different heights can be measured, the height of the catalyst bed is 1-10 m, and in the embodiment, it is preferably 4 m;

[0061] The outer wall surface of the catalyst bed is arranged by a plurality of plate pieces at equal intervals, each plate piece pair includes two plate pieces, the side edges of the two plate pieces are fixedly connected to form a cavity with an upper opening and a lower opening, the plate piece shape is selected as a rectangular plate, and the plate piece form is selected from a bubble plate, a flat plate or a corrugated plate, and in the embodiment, the bubble plate is preferred.

[0062] The above-mentioned reactor wall flow measurement method uses the above-mentioned tool to measure, and the specific steps are as follows:

[0063] When the reactor 6 is started, the gas-liquid phase feed liquid is injected from the feed pipe at the upper end of the reactor 6, and after passing through the atomizing sprayer 8 and the distributor 7, the gas-liquid phase feed liquid is uniformly distributed into the catalyst bed, due to the different surface tension properties of the catalyst and the reactor 6 wall liquid, after flowing to a certain position in the catalyst bed, the liquid phase feed liquid has a tendency to flow along the gap of the reactor 6 wall, when the feed liquid flows to the lower end position of the bed, the central and wall flow of the feed liquid in the catalyst bed is separated by the upper flow guide ring 1.2, at the outlet position, the central flow and the wall flow of the bed liquid flow into different areas of the sampling disc 4 respectively, and the proportion of the wall flow of the bed liquid can be counted by counting the weight.

[0064] The above description of the embodiments is to facilitate the ordinary skilled in the art to understand and use the utility model. The person skilled in the art can obviously easily make various modifications to these embodiments, and the general principles described herein are applied to other embodiments without the need for creative labor. Therefore, the utility model is not limited to the above embodiments, and the improvements and modifications made by the person skilled in the art according to the disclosure of the utility model without departing from the scope of the utility model should be within the protection scope of the utility model.

Claims

1. A tool for measuring the flow of a reactor wall, characterized in that, The tool comprises a separator (1) and a sampling disc (4), the separator (1) is installed at the outlet position of a reactor (6), the separator (1) comprises a flow guide ring and a grid net, the grid net is provided with the flow guide ring, the flow guide ring comprises an upper flow guide ring (1.2) and a lower flow guide ring (1.3), one end of the upper flow guide ring (1.2) is connected with the grid net, the other end extends into the catalyst bed channel (5) of the reactor (6) upward, one end of the lower flow guide ring (1.3) is connected with the grid net, the other end is connected with the sampling disc (4) downward, the catalyst is filled on the grid net, the sampling disc (4) is provided with a positioning ring table, the sampling disc (4) is connected with the lower flow guide ring (1.3) through the positioning ring table, the liquid loading area of the sampling disc (4) is divided into the central and wall adhering flow liquid areas in the catalyst bed through the positioning ring table.

2. A tool for measuring flow through a reactor wall according to claim 1, wherein, The distance between the flow guide ring and the wall surface of the reactor (6) is 0.01-0.25 times of the cylinder diameter of the reactor (6).

3. A tool for measuring flow through a reactor wall according to claim 1, wherein, The extension length of the upper flow guide ring (1.2) is 0.1-2 times of the cylinder diameter of the reactor (6). The end of the upper flow guide ring (1.2) is beveled by 5-60°, and the high position of the bevel is close to the wall surface of the reactor (6).

4. A tool for measuring flow through a reactor wall according to claim 1, wherein, The lower flow guide ring (1.3) is connected with the positioning ring table of the sampling disc (4) through buckling.

5. The tool of claim 1, wherein, The grid net comprises an outer grid net (1.4) and an inner grid net (1.5), the outer grid net (1.4) is located outside the flow guide ring, and the inner grid net (1.5) is located inside the flow guide ring.

6. A tool for measuring flow through a reactor wall according to claim 5, wherein, The separator (1) further comprises a support frame (1.1), the grid net is arranged in the support frame (1.1), the outer grid net (1.4) is located between the support frame (1.1) and the flow guide ring, and the inner grid net (1.5) is located in the region surrounded by the flow guide ring.

7. A tool for measuring flow through a reactor wall according to claim 6, wherein, The separator (1) is installed at the outlet position of the reactor (6) through a flange sheet.

8. A tool for measuring flow through a reactor wall according to claim 7, wherein, The flange sheet comprises an upper flange sheet (2) and a lower flange sheet (3), the support frame (1.1) and the grid net are arranged between the upper flange sheet (2) and the lower flange sheet (3), the upper flow guide ring (1.2) extends into the catalyst bed channel (5) of the reactor (6) upward after penetrating through the upper flange sheet (2), and the lower flow guide ring (1.3) is connected with the sampling disc (4) downward after penetrating through the lower flange sheet (3).

9. A tool for measuring flow through a reactor wall according to claim 8, wherein, The distance between the lower flange sheet (3) and the sampling disc (4) is 0.1-2 times of the cylinder diameter of the reactor (6).

10. A tool for measuring flow through a reactor wall according to claim 8, wherein, The support frame (1.1) and the grid net are connected through the upper flange sheet (2) and the lower flange sheet (3), the upper flange sheet (2) is connected with the outlet position of the reactor (6) through welding, and the upper flange sheet (2) and the lower flange sheet (3) are connected through bolts.

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