A reboiler level monitoring device

Abstract

This utility model relates to the field of liquid level monitoring production technology, and discloses a reboiler liquid level monitoring device, including a distillation column, a kettle reboiler is provided on one side of the distillation column, an overflow plate is provided inside the kettle reboiler, a feed pipe is connected through the bottom of the distillation column and the bottom of the kettle reboiler, a riser pipe is connected through the upper side wall of the distillation column and the top wall of the kettle reboiler, a condensate pipe is connected through the bottom wall of the kettle reboiler on the side away from the distillation column, a medium and low pressure steam condensate pump is provided in the middle of the condensate pipe, a gas connection interface is provided on the upper part of the side wall of the kettle reboiler on the side away from the distillation column, a liquid connection interface is provided on the side wall of the kettle reboiler below the gas connection interface, a double flange liquid level gauge is connected between the gas connection interface and the liquid connection interface, and a filter assembly is provided inside the overflow plate, which can monitor the liquid level in real time and ensure the normal operation of the device.

Description

Technical Field

[0001] This utility model relates to the field of liquid level monitoring technology, specifically a reboiler liquid level monitoring device. Background Technology

[0002] In chemical production processes, the reboiler is a critical piece of equipment, and its normal operation is essential for the entire distillation process. The reboiler heats the distilled liquid to vaporize it. The vaporized vapor rises into the distillation column, exchanges heat with the rising steam, and then condenses back into liquid, flowing back into the reboiler. This process is continuously repeated, ensuring that the material in the distillation column can continuously vaporize and condense, thereby achieving the purpose of separation and purification.

[0003] Under normal circumstances, the main reason for condensation in the reboiler is that during the heating process, some liquid is vaporized to form steam, while the unvaporized liquid remains in the reboiler and forms condensate. The condensate is extracted from the reboiler using a low-pressure steam condensate pump and transported through pipelines to a designated processing system to maintain stable equipment operation. However, when condensate cannot be discharged or there is too much condensate, the liquid level inside the reboiler will rise, affecting the heating effect and gas-liquid balance, reducing distillation efficiency, and impacting stable equipment operation. When the liquid level is too low or there is no liquid, the medium- and low-pressure steam condensate pump may experience cavitation, potentially damaging the pump. Furthermore, impurities in the liquid will have various effects on the entire distillation system, such as reduced heat transfer efficiency and increased equipment maintenance costs.

[0004] Therefore, the lack of a liquid level display in the reboiler, the inability to monitor the actual liquid level, and the absence of a mechanism to intercept and remove impurities will affect heat transfer efficiency and increase production costs in actual production. Therefore, we propose an improvement plan. Utility Model Content

[0005] The purpose of this invention is to provide a reboiler level monitoring device to solve the problem mentioned in the background art of the equipment failing to operate normally or being damaged due to the lack of a reboiler level display.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a reboiler level monitoring device, comprising a distillation column, a kettle reboiler disposed on one side of the distillation column, an overflow plate disposed inside the kettle reboiler, a feed pipe connecting the bottom of the distillation column and the bottom of the kettle reboiler, a riser connecting the upper side wall of the distillation column and the top wall of the kettle reboiler, a condensate pipe connecting the bottom wall of the kettle reboiler away from the distillation column, a medium-low pressure steam condensate pump disposed in the middle of the condensate pipe, a gas connection interface being provided on the upper part of the side wall of the kettle reboiler away from the distillation column, a liquid connection interface being provided on the side wall of the kettle reboiler below the gas connection interface, a double flange level gauge being connected between the gas connection interface and the liquid connection interface, and a filter assembly disposed inside the overflow plate.

[0007] As a further technical solution of this utility model, the kettle reboiler also includes a K-shaped shell, inside which a heating tube bundle is arranged, and a heat medium flows through the heating tube bundle. The overflow plate is arranged on one side of the heating tube bundle, and the height of the highest point of the overflow plate is 50-150mm higher than the highest point of the heating tube bundle.

[0008] As a further technical solution of this utility model, the dual-flange level gauge includes a low-pressure detection end, a high-pressure detection end, a differential pressure transmitter body, and a capillary tube. The low-pressure detection end is fixedly connected to the gas connection interface by a flange and bolts, and the high-pressure detection end is fixedly connected to the liquid connection interface by a flange and bolts. The distance between the low-pressure detection end and the high-pressure detection end is 180cm-190cm. The differential pressure transmitter body is connected to the low-pressure detection end and the high-pressure detection end through the capillary tube, which is filled with silicone oil filling liquid.

[0009] As a further technical solution of this utility model, the filter assembly includes mounting holes equally spaced on the overflow plate. The top of the overflow plate is an inclined surface, and its height decreases from the side closer to the heating tube bundle to the side farther away from the heating tube bundle. A fixing rod is threaded inside each mounting hole. A fastening block is provided at one end of each fixing rod, and a support rod is fixedly connected to the other end. An end cap is provided at the top of the support rod, and a filter plate assembly is provided between the top of the fixing rod and the end cap.

[0010] As a further technical solution of this utility model, the filter plate assembly includes a flat filter plate disposed on both sides of the fixing rod, an arc-shaped filter plate disposed on the side of the flat filter plate near the medium and low pressure steam condensate pump, the top of the arc-shaped filter plate being fixedly connected to the end cap, and fan-shaped filter plates being disposed at equal intervals and staggered on the side of the flat filter plate near the heating tube bundle, the fan-shaped filter plates being fixedly connected to the support rod.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the reboiler liquid level monitoring device can display the reboiler liquid level height and monitor the liquid level in real time, ensuring the normal operation of the device and avoiding subsequent pump damage.

[0012] (1) By opening gas connection interface and liquid connection interface, the low pressure detection end and high pressure detection end on the double flange level gauge are connected to the two interfaces respectively through flange. The differential pressure measurement principle is adopted. The liquid level height is determined by measuring the pressure difference between the bottom and top of the container. Then, the pumping speed of the medium and low pressure steam condensate pump is adjusted so that the liquid level is always in a reasonable range, ensuring the normal operation of the device and reducing the possibility of damage caused by the subsequent pump body being emptied due to insufficient liquid level.

[0013] (2) By setting up a filter assembly, the installation hole and the threaded connection of the fixing rod are used for fixing. The filter plate assembly partially filters the impurities. When too many impurities accumulate, it can be disassembled for cleaning and can play a filtering role again, which reduces the impact of impurities on the whole system and further improves the accuracy of liquid level monitoring. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the planar structure of the present invention;

[0015] Figure 2 This is a simplified planar diagram of the dual-flange level gauge of this utility model;

[0016] Figure 3 This is a three-dimensional structural diagram of the filter assembly of this utility model;

[0017] Figure 4 This is a three-dimensional structural diagram of the filter plate assembly of this utility model.

[0018] In the diagram: 1. Distillation column; 2. Kettle reboiler; 21. K-type shell; 22. Heating tube bundle; 3. Overflow plate; 4. Feed pipe; 5. Riser pipe; 6. Condensate pipe; 7. Medium and low pressure steam condensate pump; 8. Gas connection interface; 9. Liquid connection interface; 10. Double flange level gauge; 101. Low pressure detection end; 102. High pressure detection end; 103. Differential pressure transmitter body; 104. Capillary tube; 11. Filter assembly; 111. Mounting hole; 112. Fixing rod; 113. Fastening block; 114. Support rod; 115. End cap; 116. Filter plate assembly; 1161. Flat filter plate; 1162. Arc-shaped filter plate; 1163. Fan-shaped filter plate. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 A reboiler level monitoring device includes a distillation column 1, with a kettle reboiler 2 installed on one side of the distillation column 1, serving as a reboiler heater. An overflow plate 3 is installed inside the kettle reboiler 2 to ensure that the heating tube bundle 22 is completely submerged in the liquid. A feed pipe 4 is connected through the bottom of the distillation column 2 and the bottom of the kettle reboiler 2, allowing liquid to enter from the bottom of the kettle reboiler 2. A riser pipe 5 is connected through the upper sidewall of the distillation column 1 and the top wall of the kettle reboiler 2. A condensate pipe 6 is connected through the bottom wall of the kettle reboiler 2 on the side furthest from the distillation column 1, with a medium-low pressure steam condensate pump 7 installed in the middle of the condensate pipe 6.

[0021] Furthermore, the reboiler 2 also includes a K-type shell 21, inside which a heating tube bundle 22 is installed. A heat medium flows through the heating tube bundle 22. An overflow plate 3 is installed on one side of the heating tube bundle 22. The highest point of the overflow plate 3 is 50-150 mm higher than the highest point of the heating tube bundle 22. The heat medium enters from one end of the heating tube bundle and exits from the other end. The gas phase and liquid phase are separated in the space above the heating tube bundle 22. The gas phase enters the riser pipe 5 and returns to the distillation column 1. The liquid phase flows into the liquid storage tank on the other side of the overflow plate 3 (the space on the side of the K-type shell away from the heating tube bundle) and is discharged through the condensate pipe 6 by the medium and low pressure steam condensate pump 7.

[0022] A gas connection interface 8 is provided on the upper part of the side wall of the reboiler 2 away from the distillation column 1. A liquid connection interface 9 is provided on the side wall of the reboiler 1 below the gas connection interface 8. A double flange level gauge 10 is connected between the gas connection interface 9 and the liquid connection interface 8. The double flange level gauge 10 includes a low-pressure detection end 101, a high-pressure detection end 102, a differential pressure transmitter body 103, and a capillary tube 104. The low-pressure detection end 101 is fixedly connected to the gas connection interface 8 by a flange and bolts to achieve gas contact, and the pressure measured here is the low-pressure side pressure. The high-pressure detection end 102 is fixedly connected to the liquid connection interface 9 by a flange and bolts to contact the liquid, and the pressure measured here is the high-pressure side pressure.

[0023] The distance between the low-pressure detection terminal 101 and the high-pressure detection terminal 102 is 180cm-190cm, and 185cm can be used here. The differential pressure transmitter body 103 is connected to the low-pressure detection terminal 101 and the high-pressure detection terminal 102 through a capillary tube 104. The capillary tube 104 is filled with silicone oil isolation fluid. This type of level gauge adopts the differential pressure measurement principle, and determines the liquid level height by measuring the pressure difference between the bottom and top of the container. Liquid level height = (high-pressure side pressure value - low-pressure side pressure value) ÷ (density × gravitational acceleration), and the density value is 0.96.

[0024] The overflow plate 3 is internally equipped with a filter assembly 11, which includes mounting holes 111 evenly spaced on the overflow plate 3. The top of the overflow plate 3 is an inclined surface, with its height decreasing from the side closer to the heating tube bundle 22 to the side farther away from the heating tube bundle 22. Liquid can flow more quickly to the other side of the overflow plate 3 through this slope. Each mounting hole 111 is internally threaded with a fixing rod 112. The outer side of the fixing rod 112 is provided with 2-3 grooves, and each groove is provided with a rubber ring to improve the sealing performance. One end of each fixing rod 112 is provided with a fastening block 113, which is a hexagonal bolt structure. One side is provided with a notch mark to determine the orientation of the internal filter plate assembly 116. The other end is fixedly connected to a support rod 114. The top of the support rod 114 is provided with an end cap 115 for fixing the filter plate assembly 116. The filter plate assembly 116 is provided between the top of the fixing rod 112 and the end cap 115.

[0025] Furthermore, the filter plate assembly 116 includes a flat filter plate 1161 disposed on both sides of the fixing rod 112. The flat filter plate 1161 has evenly distributed filter holes (not shown in the figure) and is welded to the support rod 114. A gap is left between the flat filter plate 1161 and the end cap 115. An arc-shaped filter plate 1162 is disposed on the side of the flat filter plate 1161 near the medium and low pressure steam condensate pump 7. The top of the arc-shaped filter plate 1162 is welded to the bottom of the end cap 115, and filter holes are also opened on it. A certain gap is left between its bottom and the top of the fixing rod 112 to ensure that the flow rate is not affected. On the side of the flat filter plate 1161 near the heating tube bundle 22, fan-shaped filter plates 1163 are evenly and alternately disposed. The fan-shaped filter plates 1163 are fixedly connected to the support rod 114 to form a layered filtration structure, which intercepts impurities in the liquid as much as possible.

[0026] Clean the filter assembly 11 regularly. Remove it from the mounting hole 111 by screwing on the fastening block 113. After cleaning, insert it into the mounting hole 111 to a certain depth and screw on the fastening block 113 to fix it in place.

[0027] Working principle: The pumping speed of the medium and low pressure steam condensate pump 7 is controlled by the data read by the dual flange level gauge 10, so that the condensate is always within the normal range, ensuring heat transfer efficiency and reducing the probability of the medium and low pressure steam condensate pump 7 running dry, thus extending its service life.

[0028] Impurities in the liquid are intercepted by the filter assembly 11 through the overflow weir formed by the overflow plate 3. The liquid first flows into the installation hole, passes through the staggered fan-shaped filter plates 1183, then through the flat filter plate 1161, and finally through the arc-shaped filter plate 1162 before entering the liquid storage tank. Finally, the filter assembly is disassembled and cleaned periodically.

[0029] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A reboiler level monitoring device, comprising a distillation column (1), a kettle reboiler (2) provided on one side of the distillation column (1), an overflow plate (3) provided inside the kettle reboiler (2), a feed pipe (4) connecting the bottom of the distillation column (1) and the bottom of the kettle reboiler (2), a riser pipe (5) connecting the upper side wall of the distillation column (1) and the top wall of the kettle reboiler (2), a condensate pipe (6) connecting the bottom wall of the kettle reboiler (2) away from the distillation column (1), and a medium-low pressure steam condensate pump (7) provided in the middle of the condensate pipe (6), characterized in that: The reboiler (2) has a gas connection interface (8) on the upper part of the side wall away from the distillation column (1). Below the gas connection interface (8), the reboiler (2) has a liquid connection interface (9) on the side wall. A double flange level gauge (10) is connected between the gas connection interface (8) and the liquid connection interface (9). The overflow plate (3) has a filter assembly (11) inside.

2. The reboiler level monitoring device according to claim 1, characterized in that: The reboiler (2) also includes a K-type shell (21), inside which a heating tube bundle (22) is provided, and a heat medium flows through the heating tube bundle (22). An overflow plate (3) is provided on one side of the heating tube bundle (22), and the height of the highest point of the overflow plate (3) is 50-150 mm higher than the highest point of the heating tube bundle (22).

3. The reboiler level monitoring device according to claim 2, characterized in that: The dual-flange level gauge (10) includes a low-pressure detection end (101), a high-pressure detection end (102), a differential pressure transmitter body (103), and a capillary tube (104). The low-pressure detection end (101) is fixedly connected to the gas connection interface (8) by a flange and bolts. The high-pressure detection end (102) is fixedly connected to the liquid connection interface (9) by a flange and bolts. The distance between the low-pressure detection end (101) and the high-pressure detection end (102) is 180cm-190cm. The differential pressure transmitter body (103) is connected to the low-pressure detection end (101) and the high-pressure detection end (102) through the capillary tube (104). The capillary tube (104) is filled with silicone oil filling liquid.

4. The reboiler level monitoring device according to claim 3, characterized in that: The filter assembly (11) includes mounting holes (111) evenly spaced on the overflow plate (3). The top of the overflow plate (3) is an inclined surface, and its height decreases from the side closer to the heating tube bundle (22) to the side farther away from the heating tube bundle (22). Each mounting hole (111) is threaded with a fixing rod (112). One end of each fixing rod (112) is provided with a fastening block (113), and the other end is fixedly connected with a support rod (114). The top of the support rod (114) is provided with an end cap (115). A filter plate assembly (116) is provided between the top of the fixing rod (112) and the end cap (115).

5. The reboiler level monitoring device according to claim 4, characterized in that: The filter plate assembly (116) includes a flat filter plate (1161) disposed on both sides of the fixed rod (112). An arc-shaped filter plate (1162) is disposed on the side of the flat filter plate (1161) near the medium and low pressure steam condensate pump (7). The top of the arc-shaped filter plate (1162) is fixedly connected to the end cap (115). A fan-shaped filter plate (1163) is disposed at equal intervals on the side of the flat filter plate (1161) near the heating tube bundle (22). The fan-shaped filter plate (1163) is fixedly connected to the support rod (114).

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