Methanol evaporator

Abstract

The utility model discloses a kind of methanol evaporators, it is related to chemical production technical field, comprising: support, the support is provided with two, the top surface of two The bracket is fixedly installed with jar body, the top surface of the jar body is provided with liquid inlet pipe, the bottom surface of the jar body is provided with gas outlet pipe;Communication board, the communication board is fixedly installed on the top surface of jar body inner wall, the bottom surface of the communication board is provided with a plurality of atomizing spray head, in the utility model, by being provided with monitoring mechanism and rotary evaporation mechanism, effectively solve the uneven problem of heating surface temperature caused by local continuous liquid cooling of traditional fixed evaporator. Infrared thermal imager captures the temperature distribution of heating tube bundle surface in rotation through observation window in real time, processor intelligently judges low temperature area by analyzing data, and instructs controller to drive motor to carry out intermittent, targeted rotation.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, specifically a methanol evaporator. Background Technology

[0002] Methanol is one of the main raw materials for formaldehyde production. In a formaldehyde production system, methanol is evaporated from a liquid to a gas, and then used as one of the gases in the formaldehyde production process. It is added to other mixed gases to finally produce formaldehyde. A methanol evaporator is required for the evaporation of methanol.

[0003] A methanol evaporator is a heat exchange device specifically designed to convert liquid methanol into gaseous methanol vapor through heating. Its core principle is to use a heat source (such as hot water, steam, heat transfer oil, or electric heating) to provide energy, causing the liquid methanol to undergo a phase change under controlled conditions, transforming it from a liquid to a gas.

[0004] A search revealed a Chinese patent with publication number CN215084884U, which discloses a methanol evaporator. The evaporator includes a fixed frame, with insulation cotton fixedly connected to the outer wall of the fixed frame. An insulation frame is also fixedly connected to the outside of the insulation cotton. A top cover is provided on the top of the fixed frame, and the fixed frame and top cover are fixedly connected by bolts. A stirring device is provided on the top of the top cover. Support legs are fixedly connected to the bottom of the side wall of the insulation frame. This utility model relates to the field of chemical production technology. This methanol evaporator achieves the following: the external insulation cotton and protective frame of the fixed frame facilitate heat preservation, reduce heat loss, and improve resource utilization; the heating rod facilitates constant temperature heating, maintaining the methanol liquid temperature at the methanol boiling point for easy evaporation; and the stirring device facilitates stirring of the methanol liquid, improving heating efficiency and thus increasing methanol evaporation efficiency, meeting the application requirements.

[0005] However, existing technologies cannot monitor and intelligently control the surface temperature of the heating elements inside the evaporator in real time and across the entire area. This results in the heating surface being constantly cooled by liquid methanol spray, causing a sudden drop in temperature in some areas that cannot be automatically recovered. This leads to a sharp decrease in the methanol evaporation efficiency in those areas and the accumulation of unevaporated droplets. Meanwhile, other areas may experience energy waste and the risk of thermal decomposition and coking due to overheating.

[0006] Therefore, based on the above search and combined with existing technology, a methanol evaporator is proposed to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to provide a methanol evaporator to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A methanol evaporator includes: two supports, each with a tank fixedly mounted on its top surface; a liquid inlet pipe on the top surface of the tank and a gas outlet pipe on the bottom surface of the tank; a connecting plate fixedly mounted on the top surface of the inner wall of the tank; multiple atomizing nozzles on the bottom surface of the connecting plate; the liquid inlet pipe communicating with the connecting plate; and the multiple atomizing nozzles communicating with the connecting plate; a rotary evaporation mechanism mounted on the tank; and a monitoring mechanism mounted on the tank.

[0010] Preferably, the rotary evaporation mechanism includes: an installation chamber, which is fixedly installed on the right side wall of the tank body; a rotating disk is rotatably connected to the inner wall of the installation chamber; a plurality of heating tube bundles are provided on the left side wall of the rotating disk; the plurality of heating tube bundles are all located inside the tank body; and the rotary evaporation mechanism also includes a drive assembly.

[0011] Preferably, the drive assembly includes: a sealing cover, which is fixedly installed on the right side wall of the installation chamber, and a drive motor is fixedly installed on the left side wall inside the sealing cover, the output shaft of the drive motor being connected to the right side wall of the rotating disk.

[0012] Preferably, the monitoring mechanism includes an infrared observation window, which is disposed on the front side wall of the tank. An infrared thermal imager is mounted on the front side wall of the tank via an L-shaped connecting rod, and the infrared thermal imager monitors the temperature of the surface of the heating tube bundle.

[0013] Preferably, the monitoring mechanism further includes a processor, which is fixedly mounted on the front side wall of one of the brackets, and a controller is fixedly mounted on the front side wall of the tank.

[0014] Preferably, a distribution box is fixedly mounted on the front side wall of another of the brackets.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention effectively solves the problem of uneven heating surface temperature caused by continuous localized liquid cooling in traditional fixed evaporators by incorporating a monitoring mechanism and a rotary evaporation mechanism. An infrared thermal imager captures the temperature distribution on the rotating heating tube bundle surface in real time through an observation window. The processor intelligently identifies low-temperature areas by analyzing the data and instructs the controller to drive the motor for intermittent, targeted rotation. This allows the cooled tube bundle to be moved out of the spray area to reheat, while the reheated tube bundle resumes operation, significantly improving the overall utilization rate of the heating surface and the methanol evaporation efficiency. It also avoids energy waste caused by continuous rotation, achieving a balance between high efficiency and energy saving. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the left side structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of this utility model from below;

[0019] Figure 3 This is a schematic diagram of the overall structure of the rotary evaporation mechanism of this utility model;

[0020] Figure 4 This is a schematic diagram of the exploded structure of the rotary evaporation mechanism of this utility model.

[0021] In the diagram: 1. Support; 2. Tank; 3. Liquid inlet pipe; 4. Gas outlet pipe; 5. Installation chamber; 6. Rotary disc; 7. Heating tube bundle; 8. Sealing cover; 9. Drive motor; 10. Connecting plate; 11. Atomizing nozzle; 12. Infrared observation window; 13. L-shaped connecting rod; 14. Infrared thermal imager; 15. Processor; 16. Controller; 17. Distribution box. 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. 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.

[0023] In one typical implementation of this application, please refer to Figures 1-4 As shown, a methanol evaporator includes: a support 1, of which two supports 1 are fixedly installed on the left and right sides of the bottom of the tank body 2, respectively, to provide stable support for the entire evaporator. The two supports 1 can be welded from channel steel or I-beams, and anchor bolt holes can be provided at their bottoms for easy fixing to the foundation.

[0024] Tank 2 is a vertical cylindrical pressure vessel made of stainless steel. It has a liquid inlet pipe 3 at the top and a vent pipe 4 at the bottom. The walls of tank 2 are insulated (not shown in the figure) to reduce heat loss. The liquid inlet pipe 3 connects to an external methanol delivery pipeline and is equipped with a flow control valve (not shown in the figure). The vent pipe 4 transports the generated methanol vapor to the downstream processing section.

[0025] A connecting plate 10 is fixedly installed at the center of the top surface of the inner wall of the tank 2. It has a hollow structure with internal flow channels. The liquid inlet pipe 3 passes through the top of the tank 2 and connects to the internal flow channels of the connecting plate 10. Multiple atomizing nozzles 11 are evenly distributed on the bottom surface of the connecting plate 10 and connect to the internal flow channels of the connecting plate 10. Liquid methanol enters the connecting plate 10 through the liquid inlet pipe 3 and is then evenly atomized and sprayed out through the atomizing nozzles 11.

[0026] The rotary evaporation mechanism is mounted on tank 2 and mainly includes an installation chamber 5, a rotating disk 6, heating tube bundles 7, and a drive assembly. The installation chamber 5 is a cylindrical structure, fixedly mounted to the right side wall of tank 2 via flange connections, with sealing gaskets at the connections to ensure airtightness. The rotating disk 6 is rotatably connected to the inner wall of the installation chamber 5 via bearings. Multiple heating tube bundles 7 are fixedly mounted at their right ends to the left side wall of the rotating disk 6, and are evenly distributed radially, with all heating tube bundles 7 extending into the interior of tank 2. The heating tube bundles 7 can be multiple sets of U-shaped or serpentine tubes, containing high-temperature heat transfer oil or steam as a heat medium. The inlet and outlet pipes of the heat medium (not shown in the figure) are connected to the rotating disk 6 via rotary joints (not shown in the figure), thereby achieving dynamic heating.

[0027] The drive assembly includes a sealing cover 8 and a drive motor 9. The sealing cover 8 is bolted to the right side wall of the mounting chamber 5, forming a sealed space. The drive motor 9 is an explosion-proof servo motor or a variable frequency motor, which is fixedly installed inside the sealing cover 8 on the left side wall. The output shaft of the drive motor 9 is connected to the center of the right side wall of the rotating disk 6 via a coupling, and is used to drive the rotating disk 6 and the heating tube bundle 7 to rotate slowly and uniformly.

[0028] The monitoring mechanism is installed on the tank 2 to monitor the temperature distribution on the surface of the heating tube bundle 7 in real time and intelligently control the operation of the rotary evaporation mechanism. An infrared observation window 12 is embedded in the front wall of the tank 2, facing the working area of ​​the heating tube bundle 7. The infrared observation window 12 is made of a high-temperature resistant, corrosion-resistant material with high infrared radiation transmittance, such as germanium crystal or zinc sulfide, and is equipped with a clean gas source purging interface (not shown in the figure) to allow clean instrument air or nitrogen to be introduced to prevent contamination of the window by methanol vapor. The infrared thermal imager 14 is an explosion-proof industrial-grade thermal imager, fixedly installed on the front wall of the tank 2 via an L-shaped connecting rod 13, with its lens facing the infrared observation window 12. It is used to non-contactly acquire infrared thermal imaging data of the rotating heating tube bundle 7 surface through the infrared observation window 12.

[0029] A processor 15 (such as an industrial computer or high-performance PLC) is fixedly mounted on the front wall of one of the brackets 1 and is connected to an infrared thermal imager 14 via a data cable. The processor 15 has built-in image processing and analysis algorithms to receive data from the thermal imager, identify the temperature distribution on the surface of the heating tube bundle 7, particularly to determine if there are areas with excessively low temperatures due to continuous liquid cooling, and to calculate the temperature change trend. A controller 16 (such as a frequency converter or motor controller) is fixedly mounted on the front wall of the tank 2 and is connected to the drive motor 9 and the processor 15 via control lines. The controller 16 receives instructions from the processor 15 and precisely controls the start / stop, speed, and rotation angle of the drive motor 9 based on the temperature analysis results, thereby achieving intelligent control of the evaporation mechanism's rotational motion.

[0030] Another bracket 1 has a distribution box 17 fixedly installed on the front side wall. The box integrates electrical components such as power switches, circuit breakers, and terminals to supply power and control equipment such as drive motor 9, infrared thermal imager 14, processor 15, and controller 16.

[0031] Working principle:

[0032] During operation, a warming medium is continuously introduced into the rotating heating tube bundle 7 to heat it. Liquid methanol is delivered to the connecting plate 10 through the inlet pipe 3 and atomized by multiple atomizing nozzles 11, then evenly sprayed onto the surface of the high-speed rotating heating tube bundle 7. Upon contact with the high-temperature tube bundle surface, the atomized droplets rapidly absorb heat and vaporize, and the resulting methanol vapor accumulates within the tank 2 before being discharged through the outlet pipe 4 at the bottom. During this process, the infrared thermal imager 14 continuously monitors the temperature field distribution on the surface of the rotating heating tube bundle 7 through the infrared observation window 12 and transmits the thermal imaging data to the processor 15 in real time. The processor 15 analyzes the data using image processing algorithms. If it detects that a certain area's temperature is significantly lower than a set threshold due to continuous cooling by the methanol spray, it sends a command to the controller 16. The controller 16 then activates the drive motor 9, which drives the rotating disk 6 to rotate the heating tube bundle 7 by a certain angle. This moves the cooled tube bundle area out of the spraying zone, allowing its temperature to rise again under ambient heat radiation. Simultaneously, the tube bundle area, whose temperature has risen to its optimal operating temperature, enters the spraying zone. This intelligent intermittent rotation based on real-time temperature feedback ensures that the surface temperature of the heating tube bundle 7 is always maintained within the optimal range required for efficient evaporation, thereby significantly improving evaporation efficiency and stability, and effectively avoiding energy waste.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A methanol evaporator, characterized in that: include: The bracket (1) is provided in two parts. The top surface of the two brackets (1) is fixedly installed with a tank (2). The top surface of the tank (2) is provided with a liquid inlet pipe (3) and the bottom surface of the tank (2) is provided with a gas outlet pipe (4). A connecting plate (10) is fixedly installed on the top surface of the inner wall of the tank (2). A plurality of atomizing nozzles (11) are provided on the bottom surface of the connecting plate (10). The liquid inlet pipe (3) is connected to the connecting plate (10), and the plurality of atomizing nozzles (11) are connected to the connecting plate (10). A rotary evaporation mechanism is installed on the tank (2); The monitoring agency is located on the tank (2).

2. The methanol evaporator according to claim 1, characterized in that: The rotary evaporation mechanism includes: The installation chamber (5) is fixedly installed on the right side wall of the tank (2). The inner wall of the installation chamber (5) is rotatably connected to a rotating disk (6). The left side wall of the rotating disk (6) is provided with multiple heating tube bundles (7). All of the multiple heating tube bundles (7) are located inside the tank (2). The rotary evaporation mechanism also includes a drive assembly.

3. A methanol evaporator according to claim 2, characterized in that: The driver components include: A sealing cover (8) is fixedly installed on the right side wall of the installation chamber (5). A drive motor (9) is fixedly installed on the left side wall inside the sealing cover (8). The output shaft of the drive motor (9) is connected to the right side wall of the rotating disk (6).

4. A methanol evaporator according to claim 1, characterized in that: Monitoring agencies include: An infrared observation window (12) is provided on the front side wall of the tank (2). An infrared thermal imager (14) is installed on the front side wall of the tank (2) via an L-shaped connecting rod (13). The infrared thermal imager (14) monitors the temperature of the surface of the heating tube bundle (7).

5. A methanol evaporator according to claim 1, characterized in that: Monitoring agencies also include: A processor (15) is fixedly mounted on the front side wall of one of the brackets (1), and a controller (16) is fixedly mounted on the front side wall of the tank (2).

6. A methanol evaporator according to claim 1, characterized in that: A distribution box (17) is fixedly installed on the front side wall of another bracket (1).

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