Cooling device for improving methanol pre-rectification yield
Through the cooling cycle of air-cooling equipment, atomization components and reflow components, and the methanol vapor is cooled multiple times in combination with water-cooling equipment, the problem of insufficient cooling capacity is solved, the methanol pre-distillation yield is improved, and resource waste is reduced.
Patent Information
- Application Number
- CN202422057946.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-08-23
AI Technical Summary
The existing cooling capacity of cooling and recycling equipment is insufficient, resulting in a low initial methanol distillation yield and a waste of methanol resources.
The methanol vapor is cooled by air cooling equipment and atomization components to form a methanol liquid, and transported it back to the pre-distillation tower through the reflux module for re-distillation, setting up a cooling cycle, and combining with the water cooling equipment to perform primary and secondary cooling of the methanol vapor to improve cooling efficiency.
Effectively recover methanol, improve the initial distillation yield of methanol, avoid resource waste, enhance the cooling effect of methanol vapor, and improve the cooling capacity of the cooling device.
Smart Images
Figure CN223112352U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of methanol rectification devices, and particularly relates to a cooling device for improving the yield of methanol pre-rectification. Background Technique
[0002] In the process of chemical production, methanol, as an important organic chemical raw material and solvent, its rectification and purification process is of great significance for improving product quality and reducing production costs. Generally, the methanol rectification process usually adopts a process design including "3 + 1 towers", that is, a system combining a pre-rectification tower, a pressurized rectification tower, an atmospheric rectification tower and a stripping tower to achieve efficient separation and purification of methanol.
[0003] In the 3 + 1 tower process, the pre-rectification tower, as the first process, is mainly responsible for preliminary rectification. By heating the crude methanol and controlling the temperature, low-boiling impurities and soluble gases are separated from the crude methanol. Subsequently, these gases and part of the methanol escape from the top of the tower in the form of vapor. The pre-rectification tower is connected with a cooling and recovery device, and the cooling and recovery device cools the methanol vapor escaping from the top of the pre-rectification tower.
[0004] However, in actual applications, the existing cooling and recovery device has insufficient cooling capacity, resulting in some methanol vapor being unable to be effectively cooled and recovered, thereby leading to a low yield of methanol preliminary rectification and causing waste of methanol resources. Summary of the Utility Model
[0005] In order to solve the technical problems described in the background technique, that is, the existing cooling and recovery device has insufficient cooling capacity and leads to a low yield of methanol preliminary rectification, the utility model provides a cooling device for improving the yield of methanol pre-rectification.
[0006] The cooling device of the utility model for improving the yield of methanol pre-rectification first cools the methanol vapor by an air-cooling device and an atomization component to form methanol liquid, and then the reflux component transports the methanol liquid back to the pre-rectification tower for re-distillation. A cooling cycle is formed among the arranged air-cooling device, reflux component and pre-rectification tower, effectively recovering methanol, improving the yield of methanol preliminary rectification, and avoiding waste of methanol resources.
[0007] To solve the above technical problems, the utility model provides the following technical solutions:
[0008] A cooling device for improving the recovery rate of methanol pre-distillation, comprising an air-cooling device, an atomization component, and a reflux component; the air-cooling device is connected to a pre-distillation column, and the pre-distillation column preliminarily distills crude methanol and discharges methanol vapor from the top of the pre-distillation column; the atomization component is connected to the air-cooling device; one end of the reflux component is connected to the air-cooling device, and the other end is connected to the pre-distillation column; the air-cooling device is used to cool the methanol vapor, the atomization component is used to spray atomized water into the inner cavity of the air-cooling device, and the reflux component is used to transport the methanol liquid in the air-cooling device back into the pre-distillation column.
[0009] In a specific feasible embodiment, a plurality of air-cooling fans are arranged in the inner cavity of the air-cooling device, and the plurality of air-cooling fans are arranged side by side in the inner cavity of the air-cooling device, and the air-cooling fans are used to accelerate the air flow rate in the inner cavity of the air-cooling device.
[0010] In a specific feasible embodiment, the atomization component includes a spray head, a main atomization pipe, and an atomized water supply source; the atomized water supply source is connected to the main atomization pipe and is used to supply atomized water to the main atomization pipe; the main atomization pipe extends into the inner cavity of the air-cooling device; the spray head is connected to one end of the main atomization pipe extending into the inner cavity of the air-cooling device, and the atomized water sprayed by the spray head faces the impeller of the air-cooling fan.
[0011] In a specific feasible embodiment, a plurality of spray heads are provided; the number of spray heads is the same as the number of air-cooling fans.
[0012] In a specific feasible embodiment, the atomization component further includes a plurality of sub-atomization pipes, and the number of sub-atomization pipes corresponds to the number of spray heads; each spray head is connected to the main atomization pipe through a sub-atomization pipe.
[0013] In a specific feasible embodiment, the cooling device for improving the recovery rate of methanol pre-distillation further includes a water-cooling device; the input end of the water-cooling device is connected to the pre-distillation column, the output end of the water-cooling device is connected to the air-cooling device; the water-cooling device is connected to the reflux component.
[0014] In a specific feasible embodiment, the cooling device for improving the recovery rate of methanol pre-distillation further includes a circulating water component, and the circulating water component includes an upper water pipe, a return water pipe, and a circulating water treatment device; one end of the upper water pipe is connected to the output end of the circulating water treatment device, and the other end of the upper water pipe is connected to the water inlet of the water-cooling device for continuously transporting cooling water to the water-cooling device; one end of the return water pipe is connected to the input end of the circulating water treatment device, and the other end of the return water pipe is connected to the water outlet of the water-cooling device for recovering the cooling water used by the water-cooling device into the circulating water treatment device.
[0015] In a specific feasible embodiment, the reflux assembly includes a reflux drum, a first reflux pipe, a second reflux pipe, and a third reflux pipe; the reflux drum is communicated with the outlet of the water-cooling device through the first reflux pipe; the reflux drum is in fluid communication with the outlet of the air-cooling device through the second reflux pipe; the outlet of the reflux drum is communicated with the pre-distillation column through the third reflux pipe.
[0016] In a specific feasible embodiment, the reflux assembly further includes a booster; the booster is installed on the third reflux pipe and is used to pump the methanol liquid in the reflux drum back to the pre-distillation column for re-distillation.
[0017] In a specific feasible embodiment, the pre-distillation column includes a feed layer, a distillation layer, and a reflux layer; the feed layer is located at the bottom of the pre-distillation column and is used to receive the crude methanol to be distilled; the distillation layer is located above the feed layer and is used to distill the crude methanol; the reflux layer is in communication with the distillation layer.
[0018] In summary, the present utility model has the following beneficial technical effects:
[0019] 1. The cooling device of the present utility model for improving the pre-distillation yield of methanol first cools the methanol vapor by the air-cooling device and the atomization assembly to form methanol liquid, and then the reflux assembly transports the methanol liquid back to the pre-distillation column for re-distillation. A cooling cycle is formed among the provided air-cooling device, reflux assembly, and pre-distillation column, effectively recovering methanol, improving the preliminary distillation yield of methanol, and avoiding waste of methanol resources.
[0020] 2. The cooling device of the present utility model for improving the pre-distillation yield of methanol adopts a spray head, a main atomization pipe, and a plurality of sub-atomization pipes in the atomization assembly, so that the atomized water sprayed by the spray head faces the impeller of the air-cooling fan, realizing precise spraying of the atomized water, and further enabling more sufficient heat exchange between the methanol vapor and the atomized water, improving the cooling efficiency of the methanol vapor, and thus improving the preliminary distillation yield of methanol.
[0021] 3. The cooling device of the present utility model for improving the pre-distillation yield of methanol first cools the methanol vapor discharged from the top of the pre-distillation column through the provided water-cooling device, and then further cools the methanol vapor through the air-cooling device, further enhancing the cooling effect on the methanol vapor, and thus improving the preliminary distillation yield of methanol. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 is the overall structural schematic diagram of the cooling device of the present utility model for improving the pre-distillation yield of methanol.
[0023] Figure 2 is the structural schematic diagram of the cooling device of the present utility model for improving the pre-distillation yield of methanol.
[0024] Explanation of the accompanying drawings: 1. Air cooling equipment; 11. Air cooling fan; 2. Atomization assembly; 21. Nozzle; 22. Main atomization pipe; 23. Auxiliary atomization pipe; 3. Pre-distillation tower; 31. Feed layer; 32. Distillation layer; 33. Reflux layer; 4. Water cooling equipment; 5. Circulating water assembly; 51. Water supply pipe; 52. Return water pipe; 6. Reflux assembly; 61. Reflux tank; 62. First reflux pipe; 63. Second reflux pipe; 64. Third reflux pipe; 65. Booster. DETAILED DESCRIPTION
[0025] The technical solution of the present invention is further explained below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the implementation methods described below.
[0026] When using the "3+1 tower" for methanol distillation, the crude methanol is first sent to the pre-distillation tower 3 for preliminary distillation to remove low-boiling impurities and dissolved gases in the crude methanol; then, the pre-treated methanol enters the pressurized distillation tower for deeper separation operations to further separate methanol from heavier impurities and improve the purity of methanol; then, the methanol enters the atmospheric distillation tower, which is the final link of the purification process. At this stage, the methanol is purified to the required standard; finally, the wastewater generated at the bottom of the atmospheric distillation tower is sent to the stripping tower for treatment. In the stripping tower, the methanol in the wastewater is effectively recovered, and the wastewater itself is also purified to ensure that it meets the emission standards. Among them, the methanol vapor produced at the top of the pre-distillation tower is first cooled by the water cooling equipment 4, and most of the methanol vapor will condense into liquid methanol and be collected; the methanol vapor that is not completely cooled by the water cooling equipment 4 continues to enter the air cooling equipment 1 for further cooling; in the air cooling equipment 1, the remaining small amount of non-condensable gas is discharged to the flare system for treatment.
[0027] Reference Figure 1 A cooling device for improving the pre-distillation yield of methanol comprises: an air cooling device 1, an atomizing component 2 and a reflux component 6. The air cooling device 1 is connected to a pre-distillation tower 3, which performs preliminary distillation on crude methanol and discharges methanol vapor from the top of the pre-distillation tower 3; the atomizing component 2 is connected to the air cooling device 1; one end of the reflux component 6 is connected to the air cooling device 1, and the other end is connected to the pre-distillation tower 3; the air cooling device 1 is used to cool the methanol vapor, the atomizing component 2 is used to spray atomized water into the air cooling device 1, and the reflux component 6 is used to transport the methanol liquid in the air cooling device 1 back to the pre-distillation tower 3.
[0028] Specifically, the atomized water in the present invention can be softened water, distilled water, desalted water, etc., and any setting method is acceptable, in which the atomized water is sprayed into the air cooling device 1 to further cool the methanol vapor by the atomized water.
[0029] Reference Figure 1 andFigure 2 , there are multiple air-cooling fans 11 arranged in the inner cavity of the air-cooling device 1. The multiple air-cooling fans 11 are arranged side by side in the inner cavity of the air-cooling device 1, and the air-cooling fans 11 are used to accelerate the air flow rate in the inner cavity of the air-cooling device 1. In the present utility model, the number of the air-cooling fans 11 is not limited, and any setting method with a suitable number of air-cooling fans 11 can be adopted to fully cool the methanol vapor in the inner cavity of the air-cooling device 1.
[0030] Refer to Figure 1 and Figure 2 , the atomization assembly 2 includes a spray head 21, a main atomization pipe 22, an atomized water supply source, and multiple secondary atomization pipes 23. The atomized water supply source is connected to the main atomization pipe 22 for supplying atomized water to the main atomization pipe 22; the main atomization pipe 22 extends into the inner cavity of the air-cooling device 1; the spray head 21 is connected to one end of the main atomization pipe 22 extending into the inner cavity of the air-cooling device 1, and the atomized water sprayed by the spray head 21 faces the impeller of the air-cooling fan 11; there are multiple spray heads 21; the number of the spray heads 21 is the same as the number of the air-cooling fans 11. The number of the secondary atomization pipes 23 corresponds to the number of the spray heads 21; each spray head 21 is communicated with the main atomization pipe 22 through a secondary atomization pipe 23.
[0031] Specifically, in the present utility model, the number of the spray heads 21 can be set to two, can be set to three, or can be set to four, and any setting method with a suitable number of spray heads 21 can be adopted to fully cool the methanol vapor.
[0032] Refer to Figure 1 , the reflux assembly 6 includes a reflux tank 61, a first reflux pipe 62, a second reflux pipe 63, a third reflux pipe 64, and a pressurizing member 65. The reflux tank 61 is communicated with the outlet of the water-cooling device 4 through the first reflux pipe 62; the reflux tank 61 communicates with the outlet of the air-cooling device 1 through the second reflux pipe 63; the outlet of the reflux tank 61 is communicated with the pre-distillation column 3 through the third reflux pipe 64; the pressurizing member 65 is installed on the third reflux pipe 64 for pumping the methanol liquid in the reflux tank 61 back to the pre-distillation column 3 for re-distillation. In the present utility model, the pressurizing member 65 can be a pump, a blower, etc.
[0033] Specifically, the reflux tank 61 receives the methanol liquid from the water-cooling device 4 and the air-cooling device 1 respectively through the first reflux pipe 62 and the second reflux pipe 63; the methanol liquid in the reflux tank 61 is pumped back to the pre-distillation column 3 for re-distillation through the third reflux pipe 64 and the pressurizing member 65 installed on the pipe.
[0034] In the present utility model, by recovering the methanol liquid returned from the water-cooling device 4 and the air-cooling device 1, the primary rectification yield of methanol is further improved, and resource waste is reduced.
[0035] Example 1:
[0036] Refer toFigure 1 and Figure 2 For the cooling device used in this embodiment to improve the methanol pre - rectification yield, four spray nozzles 21 are provided, and four air - cooled fans 11 are provided. Each of the four spray nozzles 21 is arranged facing one air - cooled fan 11.
[0037] In this embodiment, each of the four spray nozzles 21 is arranged facing one air - cooled fan 11, ensuring that the atomized water can be accurately sprayed to the impeller of each air - cooled fan 11, so that each air - cooled fan 11 can be fully cooled by the atomized water, improving the cooling capacity of the entire air - cooling device 1.
[0038] Embodiment 2:
[0039] Refer to Figure 1 In this embodiment, the methanol pre - rectification system further includes a water - cooling device 4. The input end of the water - cooling device 4 is connected to the pre - rectification tower 3, the output end of the water - cooling device 4 is connected to the air - cooling device 1; the water - cooling device 4 is connected to the reflux assembly 6.
[0040] In this embodiment, the methanol vapor cooled by the water - cooling device 4 enters the air - cooling device 1. The air - cooling device 1 provides a cold air flow to exchange heat with the methanol vapor, further reducing the temperature of the methanol vapor. At the same time, the atomizing assembly 2 sprays atomized water into the air - cooling device 1, and the atomized water fully contacts the methanol vapor, quickly absorbing and taking away the heat of the methanol vapor, enhancing the cooling effect on the methanol vapor. In this embodiment, by setting the water - cooling device 4, the water - cooling device 4 initially cools the methanol vapor discharged from the top of the pre - rectification tower 3, and then the air - cooling device 1 further cools the methanol vapor, further enhancing the cooling effect on the methanol vapor, thereby improving the methanol preliminary rectification yield. In addition, the reflux tank 61 receives methanol liquid from the water - cooling device 4 and the air - cooling device 1 through the first reflux pipe 62 and the second reflux pipe 63 respectively; the methanol liquid in the reflux tank 61 is pumped back to the pre - rectification tower 3 for re - distillation through the third reflux pipe 64 and the booster 65 installed on the pipe. In this embodiment, by recovering the methanol liquid returned from the water - cooling device 4 and the air - cooling device 1, the methanol preliminary rectification yield is further improved, reducing resource waste.
[0041] Embodiment 3:
[0042] Refer to Figure 1, in this embodiment of the methanol pre - rectification system, based on Embodiment 2, a circulating water component 5 is connected to the water - cooling device 4. The circulating water component 5 includes a water supply pipe 51, a water return pipe 52, and a circulating water treatment device. The water supply pipe 51 and the water return pipe 52 are connected through the circulating water treatment device; one end of the water supply pipe 51 is connected to the output end of the circulating water treatment device, and the other end is connected to the water inlet of the water - cooling device 4 for continuously supplying cooling water to the water - cooling device 4; one end of the water return pipe 52 is connected to the input end of the circulating water treatment device, and the other end is connected to the water outlet of the water - cooling device 4 for recovering the cooling water used by the water - cooling device 4 into the circulating water treatment device.
[0043] Specifically, the water supply pipe 51 receives the treated cooling water from the output end of the circulating water treatment device and transports it to the water inlet of the water - cooling device 4; the cooling water exchanges heat with the methanol vapor in the water - cooling device 4 and its temperature rises after absorbing the heat of the methanol vapor; the cooling water with increased temperature flows back to the circulating water treatment device through the water return pipe 52 for cooling treatment for recycling. The circulating water treatment device is a conventional circulating water treatment device well - known to those skilled in the art.
[0044] In this embodiment, the circulating water component 5 continuously supplies cooling water to the water - cooling device 4, ensuring the efficient operation of the water - cooling device 4 and improving the pre - cooling effect on the methanol vapor before it enters the air - cooling device 1.
[0045] Embodiment 4:
[0046] Refer to Figure 1 , in this embodiment of the methanol pre - rectification system, based on Embodiment 3, the pre - rectification tower 3 includes a feed layer 31, a distillation layer 32, and a reflux layer 33. The feed layer 31 is located at the bottom of the pre - rectification tower 3 for receiving the crude methanol to be rectified; the distillation layer 32 is located above the feed layer 31 for distilling the crude methanol; the reflux layer 33 is located above the distillation layer 32 and is close to the top of the pre - rectification tower 3 for receiving the methanol liquid returned from the water - cooling device 4 and the air - cooling device 1; the third reflux pipe 64 is connected to the reflux layer 33.
[0047] In this embodiment, the crude methanol first starts to be heated and preliminarily evaporated in the feed layer 31, and then gas - liquid separation is achieved through the packing in the distillation layer 32. At this time, the methanol vapor gradually enriches and continues to rise to the top of the pre - rectification tower 3, and then enters the water - cooling device 4 through a pipeline; the reflux layer 33 receives the methanol liquid returned from the water - cooling device 4 and the air - cooling device 1 and introduces it into the reflux layer 33 of the pre - rectification tower 3 through the third reflux pipe 64. After the reflux layer 33 receives the refluxed methanol liquid, the methanol liquid makes counter - current contact with the methanol vapor rising from the distillation layer 32, further promoting the heat and mass transfer between gas and liquid.
[0048] The working principle of a cooling device for improving the recovery rate of methanol pre-distillation in the utility model is as follows: The crude methanol is first heated and preliminarily evaporated at the feed layer 31, and then the gas-liquid separation is achieved through the packing at the distillation layer 32. At this time, the methanol vapor gradually enriches and continues to rise to the top of the pre-distillation tower 3, and then enters the air-cooling device 1. The air-cooling fan 11 provides a cold air flow to exchange heat with the methanol vapor and reduce the temperature of the methanol vapor. At the same time, the nozzle 21 sprays atomized water at the impeller of the air-cooling fan 11. The atomized water is in full contact with the methanol vapor, quickly absorbs and takes away the heat of the methanol vapor, and further cools the methanol vapor.
[0049] The above are all the preferred embodiments of the utility model, and the protection scope of the utility model is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the utility model should be covered within the protection scope of the utility model.
Claims
1. A cooling device for improving the recovery rate of methanol pre-distillation, characterized in that: It includes an air-cooling device (1), an atomization component (2), and a reflux component (6); The air-cooling device (1) is connected to the pre-distillation column (3), and the pre-distillation column (3) preliminarily distills the crude methanol and discharges methanol vapor from the top of the pre-distillation column (3); The atomization component (2) is connected to the air-cooling device (1); One end of the reflux component (6) is connected to the air-cooling device (1), and the other end is connected to the pre-distillation column (3); The air-cooling device (1) is used to cool the methanol vapor, the atomization component (2) is used to spray atomized water into the inner cavity of the air-cooling device (1), and the reflux component (6) is used to transport the methanol liquid in the air-cooling device (1) back into the pre-distillation column (3).
2. The cooling device for improving the methanol pre-distillation yield according to claim 1, characterized in that: A plurality of air-cooling fans (11) are arranged in the inner cavity of the air-cooling device (1), the plurality of air-cooling fans (11) are arranged side by side in the inner cavity of the air-cooling device (1), and the air-cooling fans (11) are used to accelerate the air flow rate in the inner cavity of the air-cooling device (1).
3. The cooling device for improving the methanol pre-distillation yield according to claim 2, characterized in that: The atomization component (2) includes a spray head (21), a main atomization pipe (22), and an atomized water supply source; The atomized water supply source is connected to the main atomization pipe (22) and is used to supply atomized water to the main atomization pipe (22); The main atomization pipe (22) extends into the inner cavity of the air-cooling device (1); The spray head (21) is connected to one end of the main atomization pipe (22) extending into the inner cavity of the air-cooling device (1), and the atomized water sprayed by the spray head (21) faces the impeller of the air-cooling fan (11).
4. The cooling device for improving the methanol pre-distillation yield according to claim 3, characterized in that: A plurality of spray heads (21) are provided; The number of the spray heads (21) is the same as the number of the air-cooling fans (11).
5. The cooling device for improving the recovery rate of methanol pre-distillation according to claim 4, wherein: The atomization component (2) further includes a plurality of auxiliary atomization pipes (23), and the number of the auxiliary atomization pipes (23) corresponds to the number of the spray heads (21); Each spray head (21) is connected to the main atomization pipe (22) through an auxiliary atomization pipe (23).
6. The cooling device for improving the methanol pre-distillation yield according to any one of claims 1-5, characterized in that: The cooling device for improving the pre-distillation yield of methanol further includes a water-cooling device (4); The input end of the water-cooling device (4) is connected to the pre-distillation column (3), and the output end of the water-cooling device (4) is connected to the air-cooling device (1); The water-cooling device (4) is connected to the reflux component (6).
7. The cooling device for improving the methanol pre-distillation recovery rate according to claim 6, characterized in that: The cooling device for improving the pre-distillation yield of methanol further includes a circulating water component (5), and the circulating water component (5) includes a water supply pipe (51), a water return pipe (52), and a circulating water treatment device; One end of the water supply pipe (51) is connected to the output end of the circulating water treatment device, and the other end of the water supply pipe (51) is connected to the water inlet of the water-cooling device (4) for continuously supplying cooling water to the water-cooling device (4); One end of the water return pipe (52) is connected to the input end of the circulating water treatment device, and the other end of the water return pipe (52) is connected to the water outlet of the water-cooling device (4) for recovering the cooling water used by the water-cooling device (4) into the circulating water treatment device.
8. The cooling device for improving the methanol pre-distillation yield according to claim 7, characterized in that: The reflux component (6) includes a reflux tank (61), a first reflux pipe (62), a second reflux pipe (63), and a third reflux pipe (64); The reflux tank (61) is connected to the outlet of the water-cooling device (4) through the first reflux pipe (62); The reflux drum (61) communicates with the outlet of the air cooling device (1) through a second reflux pipe (63); The outlet of the reflux drum (61) communicates with the pre-distillation column (3) through a third reflux pipe (64).
9. The cooling device for improving the methanol pre-distillation recovery rate according to claim 8, characterized in that: The reflux assembly (6) further includes a pressurizing member (65); The pressurizing member (65) is installed on the third reflux pipe (64) and is used to pump the liquid in the reflux drum (61) back to the pre-distillation column (3) for re-distillation.
10. The cooling device for improving the methanol pre-distillation yield according to claim 8, characterized in that: The pre-distillation column (3) includes a feed layer (31), a distillation layer (32), and a reflux layer (33); The feed layer (31) is located at the bottom of the pre-distillation column (3) and is used to receive the crude methanol to be rectified; The distillation layer (32) is located above the feed layer (31) and is used to distill the crude methanol; The reflux layer (33) is located above the distillation layer (32) and is used to receive the liquid returned from the water cooling device (4) and the air cooling device (1); The third reflux pipe (64) communicates with the reflux layer (33).