Energy-saving condensing device for methanol vacuum concentration process

Abstract

The utility model provides a kind of energy -conserving condensing device for methanol reduced pressure concentration procedure, it is related to condensing device technical field, including with the condenser of reduced pressure concentration equipment connection, the one side of the condenser is equipped with secondary condenser, condensate recovery structure and methanol storage structure, exhaust structure is equipped between the condenser and secondary condenser, first liquid discharge structure is equipped between the condenser and methanol storage structure.In the utility model, methanol liquid and gas can be separated after condensing in the condenser, then gas is sent into secondary condenser alone, thereby preventing energy loss caused by secondary condenser cooling liquid, reducing the amount of refrigerant, avoiding unnecessary supercooling by consuming a large amount of cold energy into secondary condenser, secondary condenser only needs to handle a small amount of gas that is not condensed, load is greatly reduced, and condensing cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of condensation equipment technology, specifically an energy-saving condensation device for methanol vacuum concentration process. Background Technology

[0002] Methanol is a commonly used organic solvent in vacuum concentration processes in the chemical and pharmaceutical industries, requiring efficient recovery to reduce costs and environmental pollution. Traditional methanol condensation and recovery typically employs a two-stage condensation method: the first-stage condenser uses circulating water at approximately 7°C to initially condense the evaporated gas, condensing most of the methanol vapor, with an outlet gas temperature of approximately 35°C; the uncondensed gas then enters the second-stage condenser, where it undergoes deep condensation using an extremely low-temperature refrigerant, ultimately reducing the methanol temperature to around 10°C to ensure a high recovery rate.

[0003] However, the existing condenser has significant drawbacks: the liquid methanol that has been condensed in the first-stage condenser is at a high temperature, but it still enters the second-stage cryogenic condenser along with the uncondensed gas. This results in a large amount of "sensible heat," which is the heat released when the liquid methanol cools from 35°C to 10°C, and some "latent heat," which is a small portion that may vaporize. All of these need to be borne by the second-stage condenser, greatly increasing the load on the second-stage condenser. This leads to many problems such as high consumption of high-grade refrigerant, high energy consumption, and high operating costs.

[0004] Therefore, this utility model provides an energy-saving condensation device for methanol vacuum concentration process. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide an energy-saving condensing device for methanol vacuum concentration processes, solving the problems mentioned in the background section. This invention prevents energy loss caused by the secondary condenser cooling the liquid, reduces refrigerant usage, and avoids unnecessary subcooling by consuming large amounts of cooling energy in the secondary condenser. The secondary condenser only needs to handle a small amount of uncondensed gas, significantly reducing the load and lowering condensing costs. Manufacturing and installation costs are extremely low, requiring no complex control or power components, thus reducing maintenance costs. All uncondensed gas is sent to the secondary condenser for thorough condensation, ensuring that the methanol recovery rate remains the same as the original process, without affecting production efficiency. It also enables full utilization of the refrigerant, reducing the working pressure of the secondary condenser and ensuring condensation efficiency.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: an energy-saving condensing device for a methanol vacuum concentration process, comprising a primary condenser connected to a vacuum concentration device, a secondary condenser, a condensate recovery structure, and a methanol storage structure installed on one side of the primary condenser, an exhaust structure installed between the primary condenser and the secondary condenser, a first drain structure installed between the primary condenser and the methanol storage structure, a second drain structure installed between the secondary condenser and the methanol storage structure, a liquid seal structure installed on the first drain structure, the condensate recovery structure corresponding to the exhaust structure, and a third drain structure installed between the exhaust structure and the methanol storage structure.

[0007] Furthermore, the vacuum concentration equipment includes an evaporator and a separator. The outlet of the separator is connected to a primary condenser. Both the primary and secondary condensers are equipped with condenser tubes, which have a spiral wound structure.

[0008] Furthermore, the first-stage condenser contains a first refrigerant, which is circulating water at 7 degrees Celsius, and the second-stage condenser contains a second refrigerant, which is an ethylene glycol aqueous solution at -20 degrees Celsius. The condensate recovery structure corresponds to the ethylene glycol aqueous solution, and the condenser tubes in the two condensers are located in the first refrigerant and the second refrigerant, respectively.

[0009] Furthermore, the methanol storage structure includes a methanol storage tank, the first discharge structure includes a first discharge pipe connected to a condenser pipe in the first-stage condenser, and the liquid seal structure includes a liquid seal pipe with a U-shaped structure, and the first discharge pipe is connected to the methanol storage tank through the liquid seal pipe.

[0010] Furthermore, the second drainage structure includes a second outlet pipe, the two ends of which are connected to the condenser pipe in the secondary condenser and the methanol storage tank, respectively.

[0011] Furthermore, the third discharge structure includes a third discharge pipe, which is connected to the methanol storage tank. The top of the third discharge pipe is a spherical structure, and the third discharge pipe corresponds to the exhaust structure. A gravity valve is installed inside the third discharge pipe.

[0012] Furthermore, the exhaust structure includes an exhaust pipe and an auxiliary condenser pipe. The exhaust pipe is connected to the first liquid outlet pipe and the auxiliary condenser pipe. The auxiliary condenser pipe is connected to the condenser pipe in the secondary condenser and the auxiliary condenser pipe is connected to the third liquid outlet pipe.

[0013] Furthermore, the condensate recovery structure includes a condensate recovery tank and a heat exchange jacket, the heat exchange jacket corresponding to the auxiliary condenser tube, and the heat exchange jacket being connected to the condensate recovery tank and the secondary condenser.

[0014] The beneficial effects of this utility model are:

[0015] 1. By installing a first drain structure between the primary condenser and the methanol storage structure, and a second drain structure between the secondary condenser and the methanol storage structure, and setting a liquid seal structure on the first drain structure, the methanol liquid and gas can be separated after condensation in the primary condenser. The gas is then sent separately to the secondary condenser, thus preventing energy loss due to liquid cooling in the secondary condenser, reducing the amount of refrigerant used, and avoiding unnecessary subcooling by consuming a large amount of cooling energy in the secondary condenser. The secondary condenser only needs to handle a small amount of uncondensed gas, significantly reducing the load and lowering condensation costs.

[0016] 2. The U-shaped structure of the liquid seal pipe is relatively simple, with extremely low manufacturing and installation costs. It does not require complex control and power components, thus reducing maintenance costs.

[0017] 3. The condensation principle is the same as the existing structure, and the final condensation temperature is not changed. All uncondensed gases are sent to the secondary condenser for full condensation, ensuring that the methanol recovery rate is the same as the original process and does not affect the production effect.

[0018] 4. By setting up a condensate recovery structure and a third drainage structure, the refrigerant can be fully utilized, reducing the working pressure of the secondary condenser and ensuring the condensation effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall assembly three-dimensional structure of an energy-saving condensing device for methanol vacuum concentration process according to the present invention.

[0020] Figure 2 This is a schematic cross-sectional view of the assembly of the primary condenser, secondary condenser, and methanol storage tank in an energy-saving condensing device for methanol vacuum concentration process according to the present invention.

[0021] Figure 3 for Figure 2 A schematic diagram at point A in the middle;

[0022] Figure 4 This is a three-dimensional structural diagram of the first liquid outlet pipe and the gas outlet pipe of an energy-saving condensing device for methanol vacuum concentration process according to the present invention.

[0023] Figure 5 This is a schematic diagram of the assembly structure of the condensate recovery tank and heat exchange jacket in an energy-saving condensation device for methanol vacuum concentration process according to this utility model.

[0024] In the diagram: 1. Vacuum concentration equipment; 2. Evaporator; 3. Separator; 4. Primary condenser; 5. Secondary condenser; 6. Methanol storage tank; 7. Condensate recovery tank; 8. Condensate pipe; 9. First liquid outlet pipe; 10. Gas outlet pipe; 11. Liquid seal pipe; 12. Auxiliary condensate pipe; 13. Second liquid outlet pipe; 14. Third liquid outlet pipe; 15. Gravity valve; 16. Heat exchange jacket. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0026] Please see Figures 1 to 5 This utility model provides a technical solution: an energy-saving condensing device for a methanol vacuum concentration process, comprising a primary condenser 4 connected to a vacuum concentration device 1, a secondary condenser 5, a condensate recovery structure, and a methanol storage structure installed on one side of the primary condenser 4, an exhaust structure installed between the primary condenser 4 and the secondary condenser 5, a first drain structure installed between the primary condenser 4 and the methanol storage structure, a second drain structure installed between the secondary condenser 5 and the methanol storage structure, a liquid seal structure installed on the first drain structure, the condensate recovery structure corresponding to the exhaust structure, and a third drain structure installed between the exhaust structure and the methanol storage structure.

[0027] In this embodiment, the vacuum concentration device 1 includes an evaporator 2 and a separator 3. The outlet of the separator 3 is connected to the primary condenser 4. Both the primary condenser 4 and the secondary condenser 5 are equipped with condenser tubes 8, which have a spiral wound structure.

[0028] Specifically, the high-temperature methanol gas generated by the vacuum concentration equipment 1 enters the first-stage condenser 4 for the first condensation, producing high-temperature methanol liquid and the remaining incompletely condensed methanol gas. Then, the methanol gas enters the second-stage condenser 5 for the second condensation, which ensures the complete liquefaction of methanol, reduces methanol waste, and improves the condensation effect. The condenser tube 8 is a three-dimensional heat transfer network formed by multiple heat exchange tubes spirally wound together, which can greatly increase the contact area with the refrigerant and improve the condensation effect.

[0029] The first-stage condenser 4 contains a first refrigerant, which is circulating water at 7 degrees Celsius. The second-stage condenser 5 contains a second refrigerant, which is an ethylene glycol aqueous solution at -20 degrees Celsius. The condensate recovery structure corresponds to the ethylene glycol aqueous solution. The condenser tubes 8 in the two condensers are located in the first refrigerant and the second refrigerant respectively.

[0030] Specifically, after condensation in the first-stage condenser 4, most of the methanol vapor is condensed into a liquid state at about 35°C, and forms a gas-liquid mixture with a small amount of uncondensed gas. After separation by the liquid seal pipe 11, the gas enters the second-stage condenser 5, where the methanol gas is deeply condensed to a liquid state at 10°C, ensuring the condensation effect of methanol.

[0031] The methanol storage structure includes a methanol storage tank 6, a first discharge structure including a first discharge pipe 9, the first discharge pipe 9 being connected to a condenser pipe 8 in the first-stage condenser 4, and a liquid seal structure including a liquid seal pipe 11, the liquid seal pipe 11 being a U-shaped structure, the first discharge pipe 9 being connected to the methanol storage tank 6 through the liquid seal pipe 11.

[0032] Specifically, due to gravity, the denser liquid methanol accumulates at the bottom of the U-shaped tube, forming a certain liquid seal height. This liquid seal height should be greater than the sealing pressure required by the secondary condenser 5, and is generally designed to be between 500mm and 1200mm of water column to ensure that gas cannot pass through the liquid. Then, the liquid flows out through the liquid seal pipe 11 into the methanol storage tank 6, and the gas enters the gas outlet pipe 10. Subsequently, the gas enters the secondary condenser 5 for deep condensation.

[0033] The second drainage structure includes a second outlet pipe 13, the two ends of which are connected to the condenser pipe 8 in the secondary condenser 5 and the methanol storage tank 6, respectively.

[0034] Specifically, the methanol liquid after being deeply condensed by the secondary condenser 5 enters the methanol storage tank 6 through the second liquid outlet pipe 13 for storage.

[0035] The third discharge structure includes a third discharge pipe 14, which is connected to the methanol storage tank 6. The top of the third discharge pipe 14 is a spherical structure. The third discharge pipe 14 corresponds to the exhaust structure. A gravity valve 15 is installed inside the third discharge pipe 14.

[0036] Specifically, assisted condensation can be achieved through the auxiliary condenser 12. Methanol liquid accumulates in the third outlet pipe 14. As the pressure of the methanol liquid increases, the greater pressure opens the gravity valve 15, so that part of the liquid enters the methanol storage tank 6, and the other part of the liquid remains in the third outlet pipe 14 to form a liquid seal.

[0037] The exhaust structure includes an exhaust pipe 10 and an auxiliary condenser pipe 12. The exhaust pipe 10 is connected to the first liquid outlet pipe 9 and the auxiliary condenser pipe 12. The auxiliary condenser pipe 12 is connected to the condenser pipe 8 in the secondary condenser 5. The auxiliary condenser pipe 12 is connected to the third liquid outlet pipe 14. The condensate recovery structure includes a condensate recovery tank 7 and a heat exchange jacket 16. The heat exchange jacket 16 corresponds to the auxiliary condenser pipe 12. The heat exchange jacket 16 is connected to the condensate recovery tank 7 and the secondary condenser 5.

[0038] Specifically, methanol gas enters the secondary condenser 5 through the outlet pipe 10 and the auxiliary condenser pipe 12. After heat exchange, the refrigerant in the secondary condenser 5 enters the heat exchange jacket 16 to exchange heat with the auxiliary condenser pipe 12. This allows for heat exchange before the gas enters the secondary condenser 5, further reducing the operating pressure of the secondary condenser 5.

[0039] Workflow: The high-temperature methanol gas generated by the vacuum concentration equipment 1 enters the primary condenser 4 for the first condensation. Most of the methanol vapor is condensed into a liquid state at about 35°C, forming a gas-liquid mixture with a small amount of uncondensed gas. After separation by the liquid seal pipe 11, the gas enters the secondary condenser 5 through the outlet pipe 10 and the auxiliary condenser pipe 12. Before entering the secondary condenser 5, the gas undergoes preheating through the heat exchange jacket 16 and the auxiliary condenser pipe 12. The liquid generated by condensation in the primary condenser 4 flows out through the liquid seal pipe 11 into the methanol storage tank 6. The methanol liquid condensed in the secondary condenser 5 enters the methanol storage tank 6 through the second outlet pipe 13. The liquid condensed by the auxiliary condenser pipe 12 enters the third outlet pipe 14. As the pressure of the methanol liquid increases, the higher pressure opens the gravity valve 15, allowing a portion of the liquid to enter the methanol storage tank 6, thus achieving the condensation of methanol.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An energy-saving condensing device for a methanol vacuum concentration process, comprising a primary condenser (4) connected to a vacuum concentration unit (1), characterized in that, The primary condenser (4) is equipped with a secondary condenser (5), a condensate recovery structure and a methanol storage structure on one side. An exhaust structure is installed between the primary condenser (4) and the secondary condenser (5). A first drain structure is installed between the primary condenser (4) and the methanol storage structure. A second drain structure is installed between the secondary condenser (5) and the methanol storage structure. A liquid seal structure is installed on the first drain structure. The condensate recovery structure corresponds to the exhaust structure. A third drain structure is installed between the exhaust structure and the methanol storage structure.

2. The energy-saving condensing device for methanol vacuum concentration process according to claim 1, characterized in that: The vacuum concentration equipment (1) includes an evaporator (2) and a separator (3). The outlet of the separator (3) is connected to the first-stage condenser (4). The first-stage condenser (4) and the second-stage condenser (5) are both equipped with condenser tubes (8), which are spiral wound structures.

3. An energy-saving condensing device for methanol vacuum concentration process according to claim 2, characterized in that: The first-stage condenser (4) contains a first refrigerant, which is circulating water at 7 degrees Celsius. The second-stage condenser (5) contains a second refrigerant, which is an ethylene glycol aqueous solution at -20 degrees Celsius. The condensate recovery structure corresponds to the ethylene glycol aqueous solution. The condenser tubes (8) in the two condensers are located in the first refrigerant and the second refrigerant, respectively.

4. An energy-saving condensing device for methanol vacuum concentration process according to claim 2, characterized in that: The methanol storage structure includes a methanol storage tank (6), the first discharge structure includes a first discharge pipe (9), the first discharge pipe (9) is connected to the condenser pipe (8) in the first stage condenser (4), and the liquid seal structure includes a liquid seal pipe (11), the liquid seal pipe (11) is a U-shaped structure, and the first discharge pipe (9) is connected to the methanol storage tank (6) through the liquid seal pipe (11).

5. An energy-saving condensing device for methanol vacuum concentration process according to claim 4, characterized in that: The second drainage structure includes a second outlet pipe (13), the two ends of which are connected to the condenser pipe (8) in the secondary condenser (5) and the methanol storage tank (6), respectively.

6. An energy-saving condensing device for methanol vacuum concentration process according to claim 4, characterized in that: The third discharge structure includes a third discharge pipe (14), which is connected to the methanol storage tank (6). The top of the third discharge pipe (14) is a spherical structure. The third discharge pipe (14) corresponds to the exhaust structure. A gravity valve (15) is installed inside the third discharge pipe (14).

7. An energy-saving condensing device for methanol vacuum concentration process according to claim 6, characterized in that: The exhaust structure includes an exhaust pipe (10) and an auxiliary condenser pipe (12). The exhaust pipe (10) is connected to the first liquid outlet pipe (9) and the auxiliary condenser pipe (12). The auxiliary condenser pipe (12) is connected to the condenser pipe (8) in the secondary condenser (5). The auxiliary condenser pipe (12) is connected to the third liquid outlet pipe (14).

8. An energy-saving condensing device for methanol vacuum concentration process according to claim 4, characterized in that: The condensate recovery structure includes a condensate recovery tank (7) and a heat exchange jacket (16). The heat exchange jacket (16) corresponds to the auxiliary condenser pipe (12) and is connected to the condensate recovery tank (7) and the secondary condenser (5).

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