Methanol solution evaporation device with tail gas recovery function

Abstract

This utility model discloses a methanol solution evaporation device with tail gas recovery function, belonging to the field of methanol solution evaporation technology. Its key technical features include a base, on the top of which are installed an evaporation device, a condenser, and a recovery tank. By setting a secondary condensation component, the incompletely condensed methanol tail gas discharged from the condenser enters the shell through the tail gas inlet pipe and comes into full contact with the serpentine cooling pipe. The methanol vapor in the tail gas further condenses into a liquid state upon cooling, thereby achieving secondary recovery of methanol, improving the recovery rate and reducing the methanol content in the tail gas. By setting an adsorption component, using activated carbon adsorption blocks embedded in the support frame within the mounting frame, the tail gas still containing trace amounts of methanol after secondary condensation can be adsorbed and filtered, further removing the methanol component from the tail gas, thus avoiding environmental pollution and health risks caused by direct emission, and thus balancing environmental protection and methanol recovery benefits.

Description

Technical Field

[0001] This utility model relates to the field of methanol solution evaporation technology, and in particular to a methanol solution evaporation device with tail gas recovery function. Background Technology

[0002] In the chemical, pharmaceutical, and electronics industries, methanol solutions are widely used in raw material preparation, product cleaning, and solvent extraction processes due to their good solubility and volatility. In the subsequent processing of these processes, it is often necessary to evaporate and concentrate or separate and purify the methanol solution. Therefore, methanol solution evaporation equipment has become one of the key pieces of equipment in the relevant production processes.

[0003] Currently, conventional methanol solution evaporation devices mainly consist of an evaporator, a condenser, and a recovery tank. Their working principle involves heating the methanol solution in the evaporator to convert methanol into vapor, which is then condensed into liquid methanol by the condenser and collected in the recovery tank, thus achieving methanol recycling. However, existing evaporation devices still have significant defects and shortcomings in practical applications: First, although the methanol vapor is condensed by the condenser, due to the limited condensation efficiency, some incompletely condensed methanol vapor is still discharged with the exhaust gas. This methanol-containing exhaust gas is directly released into the air, causing excessive levels of volatile organic compounds and posing a threat to the surrounding environment and the health of operators. Second, the unrecovered methanol vapor is lost with the exhaust gas, leading to a decrease in methanol recovery rate. The long-term accumulated methanol loss significantly increases the company's production costs, thereby reducing production efficiency.

[0004] Therefore, a methanol solution evaporation device with tail gas recovery function is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a methanol solution evaporation device with tail gas recovery function. This device can solve the problem that although methanol vapor is condensed by a condenser, due to the limited condensation efficiency of the condenser, some methanol vapor that is not completely condensed is still discharged with the tail gas. This methanol-containing tail gas is directly discharged into the air, which not only causes the content of volatile organic compounds in the air to exceed the standard, but also poses a threat to the surrounding environment and the health of operators. Secondly, the methanol vapor that is not condensed and recovered will be lost with the tail gas, resulting in a decrease in the methanol recovery rate. The long-term accumulated methanol loss will significantly increase the production cost of enterprises, thereby reducing production efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a methanol solution evaporation device with tail gas recovery function, comprising a base, an evaporation device, a condenser, and a recovery tank respectively installed on the top of the base, a gas guide pipe fixedly connected between the evaporation device and the condenser, the liquid outlet of the condenser being connected to the recovery tank through a pipe, a recovery mechanism provided on the right side of the condenser, the recovery mechanism including a secondary condensation component and an adsorption component, the secondary condensation component including a shell, the shell being fixedly connected to the top of the base, a serpentine cooling pipe fixedly connected inside the shell, an inlet pipe and an outlet pipe fixedly connected at both ends of the serpentine cooling pipe respectively, and both the inlet pipe and the outlet pipe being fixedly connected to an external refrigerant supply device, and a tail gas inlet pipe fixedly connected between the shell and the condenser.

[0007] Preferably, the adsorption assembly includes a mounting frame, the bottom of which is fixedly connected to a connecting pipe and the bottom end of the connecting pipe is fixedly connected to the top of the housing, and the top of the mounting frame is fixedly connected to an exhaust pipe.

[0008] Preferably, the mounting frame has a through groove inside, a support frame is slidably connected inside the through groove, and an activated carbon adsorption block is embedded inside the support frame.

[0009] Preferably, a fixing plate is fixedly connected to the outer side of the support frame, and a screw is threadedly connected to the inside of the fixing plate. A threaded groove is opened inside the mounting frame on the side near the fixing plate, and the threaded groove is used in conjunction with the screw.

[0010] Preferably, a guide plate is fixedly connected to the bottom of the inner wall of the housing, and the top of the guide plate is set as an inclined surface.

[0011] Preferably, the bottom of the shell is fixedly connected to a drain pipe, and the drain pipe is used in conjunction with a guide plate, and the bottom end of the drain pipe is fixedly connected to the recovery tank.

[0012] Preferably, the evaporation device includes an inner cavity and a feed pipe is fixedly connected to the top of the inner cavity. A temperature sensor is installed on the inner wall of the inner cavity, and a jacket cavity is fixedly sleeved on the surface of the inner cavity. An electric heating block is fixedly installed on the inner wall of the jacket cavity.

[0013] Preferably, a controller is fixedly mounted on the surface of the jacket cavity, and the electric heating block and the temperature sensor are both electrically connected to the controller.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This application sets up a secondary condensation component. The incompletely condensed methanol tail gas discharged from the condenser enters the shell through the tail gas inlet pipe and comes into full contact with the serpentine cooling pipe. The methanol vapor in the tail gas is further condensed into liquid upon contact with the condenser, thereby realizing the secondary recovery of methanol, improving the recovery rate and reducing the methanol content in the tail gas. 2. This application sets up an adsorption component and uses activated carbon adsorption blocks embedded in the support frame inside the installation frame to adsorb and filter the exhaust gas that still has trace amounts of methanol after secondary condensation, thereby further removing the methanol component in the exhaust gas, thus avoiding environmental pollution and health risks caused by direct emission, and thus taking into account both environmental protection and methanol recovery benefits. Attached Figure Description

[0015] Figure 1 This is an overall structural diagram of the methanol solution evaporation device with tail gas recovery function of this utility model. Figure 2 The figure shows the secondary condensation component of this utility model; Figure 3 This is a schematic diagram of the structure of the adsorption component of this utility model; Figure 4 This is a schematic diagram of the evaporation device of this utility model; Figure 5 This utility model Figure 2 Enlarged diagram of point A in the middle.

[0016] In the diagram, 1. Base; 2. Evaporation device; 201. Inner cavity; 202. Feed pipe; 203. Temperature sensor; 204. Jacket cavity; 205. Heating block; 3. Condenser; 4. Recovery tank; 5. Gas guide pipe; 6. Recovery mechanism; 61. Secondary condensation assembly; 611. Shell; 612. Serpentine cooling pipe; 613. Liquid inlet pipe; 614. Liquid outlet pipe; 615. Tail gas inlet pipe; 62. Adsorption assembly; 621. Mounting frame; 622. Connecting pipe; 623. Exhaust pipe; 624. Through groove; 625. Support frame; 626. Activated carbon adsorption block; 7. Fixing plate; 8. Screw; 9. Threaded groove; 10. Guide plate; 11. Drain pipe; 12. Controller. Detailed Implementation

[0017] 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.

[0018] Please see Figure 1-5 The present invention provides the following technical solution: A methanol solution evaporation device 2 with tail gas recovery function includes a base 1. An evaporation device 2, a condenser 3, and a recovery tank 4 are respectively installed on the top of the base 1. A gas guide pipe 5 is fixedly connected between the evaporation device 2 and the condenser 3. The liquid outlet of the condenser 3 is connected to the recovery tank 4 through a pipe. A recovery mechanism 6 is provided on the right side of the condenser 3. The recovery mechanism 6 includes a secondary condensation component 61 and an adsorption component 62. The secondary condensation component 61 includes a shell 611, which is fixedly connected to the top of the base 1. A serpentine cooling pipe 612 is fixedly connected inside the shell 611. The two ends of the serpentine cooling pipe 612 are respectively fixedly connected to an inlet pipe 613 and an outlet pipe 614, and both the inlet pipe 613 and the outlet pipe 614 are fixedly connected to an external refrigerant supply device. A tail gas inlet pipe 615 is fixedly connected between the shell 611 and the condenser 3.

[0019] In this embodiment: by setting up a secondary condensation component 61, the shell 611 serves as a sealed reaction space for secondary condensation, providing a closed environment for the contact between the methanol exhaust gas and the serpentine cooling pipe 612, preventing leakage of the exhaust gas during condensation. The serpentine cooling pipe 612, through its meandering pipe structure, increases the contact area with the exhaust gas. When the external refrigerant flows within the serpentine cooling pipe 612, it can quickly absorb the heat of the exhaust gas within the shell 611, causing the incompletely condensed methanol vapor in the exhaust gas to liquefy upon cooling. Compared to straight pipes, this significantly improves condensation efficiency and maximizes the recovery of residual methanol. The liquid inlet pipe 613 is responsible for... The low-temperature refrigerant from the external refrigerant supply equipment is delivered to the serpentine cooling pipe 612 to provide a cold source for condensation. The liquid outlet pipe 614 then exports the refrigerant that has completed heat exchange and increased in temperature, returning it to the external equipment for re-cooling, thus realizing the recycling of the refrigerant and ensuring the continuous and efficient operation of secondary condensation. The exhaust gas inlet pipe 615 serves as an exhaust gas inlet channel, connecting the condenser 3 and the shell 611. It can accurately deliver the methanol-containing exhaust gas that has not been completely condensed in the condenser 3 to the shell 611, ensuring that the exhaust gas can fully contact the serpentine cooling pipe 612, avoiding direct emission of the exhaust gas, and providing a treatment target for secondary condensation.

[0020] Specifically, such as Figure 3 As shown, the adsorption component 62 includes a mounting frame 621, a connecting pipe 622 is fixedly connected to the bottom of the mounting frame 621 and the bottom end of the connecting pipe 622 is fixedly connected to the top of the housing 611, and an exhaust pipe 623 is fixedly connected to the top of the mounting frame 621.

[0021] Specifically, such as Figure 3 As shown, the mounting frame 621 has a through groove 624 inside, and a support frame 625 is slidably connected inside the through groove 624. An activated carbon adsorption block 626 is embedded inside the support frame 625.

[0022] Specifically, such as Figure 3As shown, a fixing plate 7 is fixedly connected to the outside of the support frame 625, and a screw 8 is threadedly connected inside the fixing plate 7. A threaded groove 9 is opened inside the mounting frame 621 on the side near the fixing plate 7, and the threaded groove 9 is used in conjunction with the screw 8.

[0023] In this embodiment: by setting up the adsorption component 62, the mounting frame 621 serves as the basic supporting frame for the adsorption component 62, providing a stable installation space for the internal through-slot 624, support frame 625, and activated carbon adsorption block 626. Simultaneously, the connecting pipe 622 can be connected to the exhaust pipe 623, constructing a complete channel for exhaust gas from entry to exit, ensuring the adsorption process takes place in a closed and orderly environment. One end of the connecting pipe 622 is connected to the top of the housing 611 of the secondary condensation component 61, and the other end is connected to the bottom of the mounting frame 621, allowing the secondary condensed gas to pass through the exhaust pipe 621. The residual trace amounts of methanol in the exhaust gas are precisely delivered to the activated carbon adsorption block 626 inside the mounting frame 621, providing a target for subsequent adsorption and purification, and preventing leakage of the exhaust gas during transportation. The exhaust pipe 623 serves as the discharge channel for the purified exhaust gas, and is fixedly connected to the top of the mounting frame 621. It can safely discharge the exhaust gas that has been filtered by the activated carbon adsorption block 626 and whose methanol content meets the standards, completing the final stage of exhaust gas treatment and ensuring that the emitted gas does not pose a threat to the environment and human health. The through-slot 624 is opened inside the mounting frame 621, and its dimensions are the same as those of the support frame 62. 5. The support frame 625 can be smoothly inserted or removed along the through groove 624, facilitating regular removal by staff to replace the activated carbon adsorption block 626. This prevents a decrease in adsorption efficiency due to adsorption block saturation, ensuring the long-term effective operation of the adsorption assembly 62. The support frame 625 supports the activated carbon adsorption block 626 and can stably fix the adsorption block within the mounting frame 621 through its own structure, preventing the adsorption block from shifting or scattering under the impact of exhaust gas. This ensures that the exhaust gas can fully contact the activated carbon adsorption block 626, guaranteeing adsorption efficiency. By utilizing the strong adsorption properties of the porous structure of activated carbon, trace amounts of methanol molecules remaining in the exhaust gas after secondary condensation can be adsorbed and retained, further reducing the methanol content in the exhaust gas and achieving deep purification of the exhaust gas. This compensates for the inability of secondary condensation to completely remove methanol, balancing environmentally friendly emissions with maximum methanol recovery. The fixing plate 7 can firmly fix the support frame 625 inserted into the through slot 624 in the mounting frame 621, preventing the support frame 625 from loosening or shifting during device operation. When disassembling, the support frame 625 can be pulled out simply by unscrewing the screws 8, balancing the reliability of the fixation with the convenience of disassembly and assembly.

[0024] Specifically, such as Figure 5 As shown, a guide plate 10 is fixedly connected to the bottom of the inner wall of the housing 611, and the top of the guide plate 10 is set as an inclined surface.

[0025] Specifically, such as Figure 5As shown, the bottom of the housing 611 is fixedly connected to a drain pipe 11, and the drain pipe 11 is used in conjunction with the guide plate 10. The bottom end of the drain pipe 11 is fixedly connected to the recovery tank 4.

[0026] In this embodiment: With the above settings, the guide plate 10 is fixed to the bottom of the inner wall of the housing 611. The inclined structure at the top of the guide plate can use gravity to guide the liquid methanol condensed by the serpentine cooling pipe 612 (attached to the pipe wall or dripping to the bottom of the housing 611) to the inlet of the drain pipe 11. This prevents the liquid methanol from flowing, remaining or accumulating randomly at the bottom of the inner wall of the housing 611, ensuring that every drop of condensed methanol can be accurately guided to the subsequent collection channel. This minimizes the loss of methanol in the secondary condensation stage and improves the overall recovery rate. The drain pipe 11 can directly transport the liquid methanol collected by the guide plate 10 to the recovery tank 4 for storage. On the one hand, this avoids the condensed liquid methanol from remaining in the housing 611 for a long time. On the other hand, it collects the secondary recovered methanol and the methanol recovered from the primary condensation in the same way, which is convenient for subsequent reuse, further reducing raw material waste and lowering the production cost of the enterprise.

[0027] Specifically, such as Figure 4 As shown, the evaporation device 2 includes an inner cavity 201 and a feed pipe 202 is fixedly connected to the top of the inner cavity 201. A temperature sensor 203 is installed on the inner wall of the inner cavity 201. A jacket cavity 204 is fixedly sleeved on the surface of the inner cavity 201. An electric heating block 205 is fixedly installed on the inner wall of the jacket cavity 204.

[0028] Specifically, such as Figure 1 As shown, a controller 12 is fixedly mounted on the surface of the jacket cavity 204, and the electric heating block 205 and temperature sensor 203 are all electrically connected to the controller 12.

[0029] In this embodiment: Through the above settings, the inner cavity 201 can provide a closed heating space for the methanol solution, preventing leakage or external contamination during evaporation. Simultaneously, it ensures that methanol vapor can be concentrated and enter the gas guide pipe 5 through the top channel, guaranteeing steam collection efficiency. The feed pipe 202 can accurately deliver the methanol solution to be evaporated into the inner cavity 201, enabling convenient addition of the solution. The temperature sensor 203 is installed on the inner wall of the inner cavity 201, which can detect the temperature of the methanol solution in the inner cavity 201 in real time and convert the temperature data into an electrical signal, transmitting it to the controller 12. This provides data for precise control of the heating process, preventing excessively high temperatures from causing methanol decomposition or excessively low temperatures from affecting evaporation efficiency. The jacket cavity 204 is fixedly fitted onto the surface of the inner cavity 201, forming a closed space surrounding the inner cavity 201. This provides an installation carrier for the electric heating block 205 and reduces heat loss during heating, improving heat utilization efficiency and preventing direct contact with external personnel. The electric heating block 205, the core heating component of the evaporation device 2, is fixed to the inner wall of the jacket cavity 204. After being powered on, it generates heat and transfers it to the inner cavity 201, providing the thermal energy required for the evaporation of the methanol solution in the inner cavity 201, so that the methanol solution reaches the boiling point and is converted into steam. Its surrounding installation can achieve uniform heating of the inner cavity 201 and avoid local overheating that could lead to solution carbonization. The controller 12 can receive real-time temperature data of the inner cavity 201 transmitted by the temperature sensor 203. When the temperature is detected to be lower than the boiling point of methanol (or the preset evaporation temperature), it automatically controls the electric heating block 205 to increase its power and increase the heat output. When the temperature reaches the preset value (or approaches the overheating threshold), it automatically reduces the power of the electric heating block 205 or stops heating to avoid excessive temperature fluctuations. This ensures stable evaporation of the methanol solution, prevents safety risks caused by temperature runaway, and reduces unnecessary energy consumption, achieving energy-saving operation.

[0030] Working principle: First, open the feed pipe 202 valve to slowly inject the methanol solution to be treated into the inner cavity 201. After feeding is completed, close the feed pipe 202 valve. Then, the controller 12 starts the electric heating block 205. The heat inside the jacket cavity 204 is evenly transferred to the inner cavity 201 to heat the methanol solution. At the same time, the temperature sensor 203 on the inner wall of the inner cavity 201 can monitor the solution temperature in real time and feed the data back to the controller 12. When the temperature reaches the preset evaporation temperature, the controller 12 automatically adjusts the power of the electric heating block 205 to maintain the temperature of the inner cavity 201. After the methanol solution is heated, it evaporates and forms a mixed gas containing methanol vapor. The gas first enters the condenser 3 through the gas guide pipe 5. The condenser 3 uses its own cooling system (such as a cold water jacket, which is not detailed in the claims but is a conventional structure) to initially condense the vapor, so that most of the methanol vapor is converted into liquid methanol. Then, the liquid methanol is transported to the recovery tank 4 through the outlet of the condenser 3 via a pipeline, completing the first stage of methanol recovery. Then, the uncondensed exhaust gas in condenser 3 enters the housing 611 of the secondary condensation assembly 61 through the exhaust gas inlet pipe 615. The serpentine cooling pipe 612 (with external refrigerant) inside the housing 611 comes into full contact with the exhaust gas, and performs secondary cooling and condensation on the residual methanol vapor, turning it into liquid methanol that drips onto the bottom of the inner wall of the housing 611. The guide plate 10 at the bottom of the inner wall of the housing 611 guides the liquid methanol to flow to the lowest point, and finally collects it into the drain pipe 11 at the bottom of the housing 611. Then, the liquid methanol flows into the recovery tank 4 through the drain pipe 11, completing the second stage of methanol recovery. The trace amount of methanol vapor that is still not removed after secondary condensation enters the housing frame 621 through the connecting pipe 622. The activated carbon adsorption block 626 embedded in the support frame 625 inside the housing frame 621 physically adsorbs the trace amount of methanol vapor, further purifying the exhaust gas and ensuring that the methanol concentration in the exhaust gas is reduced to below the emission standard. Finally, the purified exhaust gas can be safely discharged through the exhaust pipe 623 at the top of the housing frame 621.

[0031] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A methanol solution evaporation device (2) with tail gas recovery function, comprising a base (1), characterized in that: An evaporator (2), a condenser (3), and a recovery tank (4) are respectively installed on the top of the base (1). A gas guide pipe (5) is fixedly connected between the evaporator (2) and the condenser (3). The liquid outlet of the condenser (3) is connected to the recovery tank (4) through a pipe. A recovery mechanism (6) is provided on the right side of the condenser (3). The recovery mechanism (6) includes a secondary condensation component (61) and an adsorption component (62). The secondary condensation component (61) includes a shell (611). The shell (611) is fixedly connected to the top of the base (1). A serpentine cooling pipe (612) is fixedly connected inside the shell (611). The two ends of the serpentine cooling pipe (612) are respectively fixedly connected to an inlet pipe (613) and an outlet pipe (614). The inlet pipe (613) and the outlet pipe (614) are both fixedly connected to an external refrigerant supply device. A tail gas inlet pipe (615) is fixedly connected between the shell (611) and the condenser (3).

2. The methanol solution evaporation device (2) with tail gas recovery function according to claim 1, characterized in that: The adsorption component (62) includes a mounting frame (621), the bottom of which is fixedly connected to a connecting pipe (622) and the bottom end of the connecting pipe (622) is fixedly connected to the top of the housing (611), and the top of the mounting frame (621) is fixedly connected to an exhaust pipe (623).

3. The methanol solution evaporation device (2) with tail gas recovery function according to claim 2, characterized in that: The mounting frame (621) has a through groove (624) inside, and a support frame (625) is slidably connected inside the through groove (624). An activated carbon adsorption block (626) is embedded inside the support frame (625).

4. The methanol solution evaporation device (2) with tail gas recovery function according to claim 3, characterized in that: The support frame (625) is fixedly connected to a fixing plate (7) on the outside. The fixing plate (7) is threaded with screws (8). The mounting frame (621) is provided with a threaded groove (9) on the side near the fixing plate (7), and the threaded groove (9) is used in conjunction with the screws (8).

5. The methanol solution evaporation device (2) with tail gas recovery function according to claim 1, characterized in that: A guide plate (10) is fixedly connected to the bottom of the inner wall of the housing (611), and the top of the guide plate (10) is set as an inclined surface.

6. The methanol solution evaporation device (2) with tail gas recovery function according to claim 1, characterized in that: The bottom of the housing (611) is fixedly connected to a drain pipe (11), and the drain pipe (11) is used in conjunction with the guide plate (10). The bottom end of the drain pipe (11) is fixedly connected to the recovery tank (4).

7. The methanol solution evaporation device (2) with tail gas recovery function according to claim 1, characterized in that: The evaporation device (2) includes an inner cavity (201) and a feed pipe (202) is fixedly connected to the top of the inner cavity (201). A temperature sensor (203) is installed on the inner wall of the inner cavity (201). A jacket cavity (204) is fixedly sleeved on the surface of the inner cavity (201). An electric heating block (205) is fixedly installed on the inner wall of the jacket cavity (204).

8. The methanol solution evaporation device (2) with tail gas recovery function according to claim 7, characterized in that: A controller (12) is fixedly installed on the surface of the jacket cavity (204), and the electric heating block (205) and the temperature sensor (203) are electrically connected to the controller (12).

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