A rectification column reboiler for dimethyl carbonate production

Abstract

The utility model relates to rectifying tower technical field, and disclose a kind of rectifying tower reboiler for dimethyl carbonate production, including reboiler main body, the bottom of reboiler main body is fixedly connected with liquid inlet pipe, the top of reboiler main body is fixedly connected with gas outlet pipe, the side of reboiler main body upper end is fixedly connected with steam inlet pipe, the side of reboiler main body lower end is fixedly connected with condensate outlet pipe, the other side of reboiler main body lower end is fixedly connected with two connecting pipes, the other end of two connecting pipes is connected with replacement component, the other end of two replacement components is connected with two liquid level meters respectively.The kind of rectifying tower reboiler for dimethyl carbonate production, by liquid level meter real-time monitoring and maintaining reboiler main body in higher than condensate outlet pipe mouth liquid level, form liquid seal and block steam into subsequent process, reduce steam consumption and unit production cost.

Description

Technical Field

[0001] This utility model relates to the field of distillation column technology, specifically a reboiler for a distillation column used in the production of dimethyl carbonate. Background Technology

[0002] The distillation column reboiler is a crucial heat exchange device in the distillation system. In the production of dimethyl carbonate (DMC), the distillation column reboiler is the core heat source device of the entire separation system.

[0003] Patent CN219662907U discloses a reboiler for a distillation column, comprising a reboiler body and a base. An electromagnetic heating coil is installed on the inner wall of the reboiler body. Metal heating tanks are located between the top and bottom surfaces of the reboiler body. An electromagnetic heater is installed on the top of the base, and a connecting end is located on one side of the electromagnetic heater, with one end connected to one end of the electromagnetic heating coil. This distillation column reboiler, by using the electromagnetic heater and the connecting end to control the electromagnetic heating coil, heats the metal heating tanks using electromagnetic heating principles. This ensures uniform heating of the internal temperature of the metal heating tanks, reduces internal convection, and to some extent, extends the service life of the reboiler.

[0004] However, the reboiler of the distillation column mentioned above still has the following problems in actual use:

[0005] In the production process of propylene carbonate reacting with methanol via transesterification to produce dimethyl carbonate and propylene glycol as a byproduct, the reboiler of the extractive distillation column consumes a large amount of steam. The steam flow rate is controlled by a regulating valve. After passing through the reboiler, the condensate is sent to subsequent processes via a steam trap. However, at the same time, steam may also enter subsequent processes through the steam trap, resulting in steam waste and increased production costs. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides a reboiler for a distillation column used in the production of dimethyl carbonate. By controlling the flow rate of the reboiler condensate, the liquid level in the reboiler shell can be controlled, forming a liquid seal. This prevents steam from entering subsequent processes, reducing steam consumption and lowering unit production costs.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a reboiler for a distillation column used in the production of dimethyl carbonate, comprising a reboiler body, a liquid inlet pipe fixedly connected to the bottom of the reboiler body, a gas outlet pipe fixedly connected to the top of the reboiler body, a steam inlet pipe fixedly connected to one side of the upper end of the reboiler body, a condensate outlet pipe fixedly connected to one side of the lower end of the reboiler body, and two connecting pipes fixedly connected to the other side of the lower end of the reboiler body. The other ends of the two connecting pipes are each connected to a replacement assembly, and the other ends of the two replacement assemblies are respectively connected to two level gauges.

[0008] Furthermore, the replacement assembly includes a U-shaped tube and two valves. The middle part of the U-shaped tube is fixedly connected to the end of the connecting tube away from the reboiler body, and the other two ends of the U-shaped tube are respectively connected to two level gauges. The two valves are located on both sides of the connecting tube.

[0009] Furthermore, the valve is a solenoid valve.

[0010] Furthermore, the U-tube is detachably connected to the level gauge via a flange.

[0011] Furthermore, a pressure sensor is fixedly connected to the lower end of the reboiler body near the U-shaped tube, and the detection end of the pressure sensor is located inside the reboiler body.

[0012] Furthermore, three audible and visual alarms are fixedly connected to the upper surface of one of the U-shaped tubes. Two of the audible and visual alarms are respectively matched with two level gauges, and the third audible and visual alarm is matched with the connecting pipe and the U-shaped tube.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This type of reboiler for distillation column used in the production of dimethyl carbonate monitors and maintains the liquid level in the main body of the reboiler above the condensate outlet in real time through a level gauge, forming a liquid seal to prevent steam from entering subsequent processes, thereby reducing steam consumption and unit production cost.

[0015] 2. This type of reboiler for distillation column used in the production of dimethyl carbonate replaces the design of the U-tube and double valve in the component, allowing the level gauge to be switched without stopping the machine. With the detachable structure of the flange connection, the clogged parts can be quickly disassembled and cleaned, reducing production downtime.

[0016] 3. This type of reboiler for distillation column used in the production of dimethyl carbonate has a pressure sensor and a level gauge linked together. When the values ​​of both are abnormal, the level gauge is automatically switched to prevent monitoring failure due to the failure of a single level gauge and ensure stable operation of the equipment.

[0017] 4. This type of reboiler for distillation column used in the production of dimethyl carbonate has three audible and visual alarms corresponding to scenarios such as blockage of the level gauge and blockage of the connecting pipe / U-tube, which can quickly locate the type of fault, making it easier for operators to handle in a timely manner and reducing the difficulty of equipment maintenance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall appearance of the present utility model;

[0019] Figure 2 This utility model Figure 1 Explosion diagram of the middle part;

[0020] Figure 3 This utility model Figure 2 Enlarged diagram of point A in the middle.

[0021] In the diagram: 1. Reboiler body; 2. Liquid inlet pipe; 3. Condensate outlet pipe; 4. Steam inlet pipe; 5. Gas outlet pipe; 6. Connecting pipe; 7. U-shaped pipe; 8. Valve; 9. Level gauge; 10. Pressure sensor; 11. Audible and visual alarm. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figures 1-3 A reboiler for a distillation column used in the production of dimethyl carbonate includes a reboiler body 1, a liquid inlet pipe 2 fixedly connected to the bottom of the reboiler body 1, a gas outlet pipe 5 fixedly connected to the top of the reboiler body 1, a steam inlet pipe 4 fixedly connected to one side of the upper end of the reboiler body 1, a condensate outlet pipe 3 fixedly connected to one side of the lower end of the reboiler body 1, and two connecting pipes 6 fixedly connected to the other side of the lower end of the reboiler body 1. The other ends of the two connecting pipes 6 are each connected to a replacement assembly, and the other ends of the two replacement assemblies are respectively connected to two level gauges 9.

[0024] like Figures 1 to 3 As shown, in the present invention, the reboiler for distillation column production of dimethyl carbonate is used such that liquid is introduced into the reboiler body 1 through liquid inlet pipe 2, and steam is introduced into the reboiler body 1 through steam inlet pipe 4. The condensate after being condensed inside the reboiler body 1 is discharged to the outside through condensate outlet pipe 3. At the same time, the gas separated by the reboiler body 1 is discharged into another pipe through gas outlet pipe 5.

[0025] During the operation of the reboiler body 1, in order to avoid the waste caused by steam being discharged from the condensate outlet pipe 3, the liquid level capacity inside the reboiler body 1 is monitored in real time by the liquid level gauge 9. The steam is blocked by the liquid level being higher than that at the condensate outlet pipe 3, thereby preventing steam leakage.

[0026] In a preferred embodiment of this invention, the replacement assembly includes a U-shaped tube 7 and two valves 8. The middle portion of the U-shaped tube 7 is fixedly connected to the end of the connecting pipe 6 furthest from the reboiler body 1. The other two ends of the U-shaped tube 7 are respectively connected to two level gauges 9. The two valves 8 are located on both sides of the connecting pipe 6. The valves 8 are solenoid valves. The U-shaped tube 7 is detachably connected to the level gauges 9 via flanges.

[0027] More specifically, during continuous use, impurities may enter the level gauge 9 through the connecting pipe 6 during the dimethyl carbonate production process, causing blockage inside the level gauge 9 (for example, the weight of the float in the float level gauge increases, or the float rubs against the inner wall of the level gauge, which will affect the normal rise of the float). In order to avoid stopping the operation of the entire reboiler body 1, it is only necessary to change the two valves 8 at the upper and lower ends of the same level gauge 9 to close the level gauge 9 (or open another level gauge 9), thus saving time (of course, one can be opened first and then the other closed, which is not limited to this). Afterwards, during the normal operation of the other level gauge 9, the previously blocked level gauge 9 can be removed from the flange for cleaning, which is convenient and easy to operate.

[0028] As a preferred embodiment of this utility model, a pressure sensor 10 is fixedly connected to the lower end of the reboiler body 1 near the U-shaped tube 7, and the detection end of the pressure sensor 10 is located inside the reboiler body 1.

[0029] More specifically, by setting up a pressure sensor 10, it can work with a solenoid valve (valve 8) and a level gauge 9 to monitor the water pressure inside the reboiler body 1 in real time. In this way, when the level gauge 9 and the pressure sensor 10 are in an abnormal state, which means that the level gauge 9 is blocked, the level gauge 9 can be automatically switched and the previous level gauge 9 can be cleaned.

[0030] As a preferred embodiment of this utility model, three audible and visual alarms 11 are fixedly connected to the upper surface of one of the U-shaped tubes 7, two of which are respectively matched with two liquid level gauges 9, and the third audible and visual alarm 11 is matched with the connecting pipe 6 and the U-shaped tube 7.

[0031] More specifically, by setting up three audible and visual alarms 11, an abnormality can be detected between the pressure sensor 10 and the level gauge 9 in use, indicating that there is a blockage inside the level gauge 9 in use, and it should be switched to another level gauge 9 in time. In addition, since the connecting pipe 6 and the U-tube 7 may also become blocked, if there is still an abnormality after switching to another level gauge 9, it means that the connecting pipe 6 and the U-tube 7 are blocked. At this time, the reboiler body 1 must be stopped and the connecting pipe 6 and the U-tube 7 must be cleaned.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A reboiler for a distillation column used in the production of dimethyl carbonate, comprising a reboiler body (1), characterized in that: A liquid inlet pipe (2) is fixedly connected to the bottom of the reboiler body (1), a gas outlet pipe (5) is fixedly connected to the top of the reboiler body (1), a steam inlet pipe (4) is fixedly connected to one side of the upper end of the reboiler body (1), a condensate outlet pipe (3) is fixedly connected to one side of the lower end of the reboiler body (1), and two connecting pipes (6) are fixedly connected to the other side of the lower end of the reboiler body (1). The other ends of the two connecting pipes (6) are each connected to a replacement component, and the other ends of the two replacement components are respectively connected to two level gauges (9).

2. The reboiler for a distillation column in the production of dimethyl carbonate according to claim 1, characterized in that: The replacement assembly includes a U-shaped tube (7) and two valves (8). The middle part of the U-shaped tube (7) is fixedly connected to one end of the connecting tube (6) away from the reboiler body (1). The other two ends of the U-shaped tube (7) are respectively connected to two level gauges (9). The two valves (8) are located on both sides of the connecting tube (6).

3. A reboiler for a distillation column in the production of dimethyl carbonate according to claim 2, characterized in that: The valve (8) is a solenoid valve.

4. A reboiler for a distillation column in the production of dimethyl carbonate according to claim 3, characterized in that: The U-shaped tube (7) is detachably connected to the level gauge (9) via a flange.

5. A reboiler for a distillation column in the production of dimethyl carbonate according to claim 4, characterized in that: A pressure sensor (10) is fixedly connected to the lower end of the reboiler body (1) near the U-shaped tube (7), and the detection end of the pressure sensor (10) is located inside the reboiler body (1).

6. A reboiler for a distillation column in the production of dimethyl carbonate according to claim 5, characterized in that: Three audible and visual alarms (11) are fixedly connected to the upper surface of one of the U-shaped tubes (7). Two of the audible and visual alarms (11) are respectively connected to two liquid level gauges (9), and the third audible and visual alarm (11) is connected to the connecting pipe (6) and the U-shaped tube (7).

Images