Condensation recovery device for vacuum drying

Abstract

The utility model discloses a condensation recovery device for vacuum drying, which comprises a multi-stage condenser, a vapor-liquid separation device, a vacuumizing device and a liquid discharge component, a tail gas inlet of the multi-stage condenser is communicated with a tail gas pipeline, a tail gas outlet of the multi-stage condenser is communicated with a gas inlet end of the vapor-liquid separation device, and a gas outlet end of the vapor-liquid separation device is communicated with the liquid discharge component. The exhaust end of the vapor-liquid separation device is communicated with the vacuumizing device, the multi-stage condenser is connected in a refrigerant circulation pipeline, a condensate outlet of the multi-stage condenser is communicated to a liquid inlet of the vapor-liquid separation device through a liquid discharging pipe, and condensate in the vapor-liquid separation device is discharged through a liquid discharging assembly. According to the vacuum drying system, water vapor in tail gas can be condensed into liquid, gas-liquid separation and condensate recovery are achieved, and meanwhile the stability of the working pressure in the vacuum drying system is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of vacuum drying, in particular to a condensation recovery device for vacuum drying. Background Art

[0002] During the vacuum drying process, moisture and other volatile components in the material evaporate, forming gases containing these components. To protect the environment and conserve resources, these gases need to be condensed and recovered to prevent direct release into the atmosphere. Condensate recovery devices have broad application prospects in the vacuum drying field. They can not only treat hazardous substances in waste and waste liquids from industries such as food, chemicals, and pharmaceuticals, but also recover useful resources from these industries. Furthermore, condensate recovery devices play an important role in the environmental protection industry, contributing to waste reduction and resource utilization.

[0003] Key components in vacuum drying equipment, such as vacuum pumps, need to be protected from erosion by water vapor and other corrosive gases. Therefore, when designing a condensation recovery device, it is necessary to ensure that the condensation recovery device can separate water vapor from the air as much as possible to prevent it from entering the vacuum pump, thereby protecting the vacuum pump from damage and ensuring stable operation and long service life of the pump. Utility Model Content

[0004] In order to achieve the above purpose, the utility model discloses a condensation recovery device for vacuum drying, which can condense water vapor in tail gas into liquid, realize gas-liquid separation and condensate recovery, and at the same time ensure the stability of the internal working pressure of the vacuum drying system.

[0005] The specific technical solutions of the utility model are as follows:

[0006] A condensation recovery device for vacuum drying comprises a multi-stage condenser and a vapor-liquid separation device, a vacuum pumping device and a drainage assembly, wherein the tail gas inlet of the multi-stage condenser is connected to the tail gas pipeline, the tail gas outlet of the multi-stage condenser is connected to the air inlet end of the vapor-liquid separation device, the exhaust end of the vapor-liquid separation device is connected to the vacuum pumping device, the multi-stage condenser is connected to the refrigerant circulation pipeline, the condensate outlet of the multi-stage condenser is connected to the liquid inlet of the vapor-liquid separation device via a drainage pipe, and the condensate in the vapor-liquid separation device is discharged via the drainage assembly.

[0007] Preferably, the multi-stage condenser includes a first-stage condenser and a second-stage condenser, and the exhaust gas outlet of the first-stage condenser is connected to the exhaust gas inlet of the second-stage condenser. The condensates of the first-stage condenser and the second-stage condenser are merged and connected to the liquid inlet of the vapor-liquid separation device. The first-stage condenser and the second-stage condenser are connected in parallel with each other in the refrigerant circulation pipeline.

[0008] Preferably, the vapor-liquid separation device is a single-layer tank structure, the exhaust end of the single-layer tank is connected to the vacuum pumping device, and the single-layer tank maintains a vacuum state.

[0009] Preferably, the vapor-liquid separation device is a double-layer tank structure, and the double-layer tank includes a cavity I and a cavity II arranged upper and lower, wherein the air inlet end of cavity I is connected to the exhaust outlet of the multi-stage condenser, and the exhaust end of cavity I is connected to the vacuum pumping device. Cavity I maintains a vacuum state, and cavity I and cavity II are connected through a vacuum balancing valve. The overflow port of cavity I is connected to cavity II through an overflow valve. A drainage assembly is provided at the bottom end of cavity II, and cavity II is connected to the air supply pipeline through an air supply valve.

[0010] Preferably, the drainage component is a drainage valve, a first drainage pump, a second drainage pump, a first check valve and a second check valve. The drainage valve is arranged at the drainage end of the gas-liquid separation device, and the drainage pipeline is divided into two branches through the outlet end of the drainage valve. One branch is connected to the first drainage pump and the first check valve in sequence for waste liquid recovery, and the other branch is connected to the second drainage pump and the second check valve in sequence for waste liquid recovery.

[0011] Preferably, the vapor-liquid separation device further includes a liquid level gauge, and the liquid level gauges are respectively arranged in the vapor-liquid separation device for monitoring the highest liquid level and the lowest liquid level of the condensate, and the liquid level gauges are respectively connected to the drain valve, the first drain pump and the second drain pump for information feedback.

[0012] Preferably, when the vapor-liquid separation device is a single-layer tank structure, the first liquid displacement pump and the second liquid displacement pump are both vacuum liquid displacement pumps.

[0013] Preferably, when the gas-liquid separation device is a double-layer tank structure, the first liquid displacement pump and the second liquid displacement pump are both normal pressure liquid displacement pumps.

[0014] Beneficial effects: The utility model discloses a condensation recovery device for vacuum drying, which has the following advantages compared with the prior art:

[0015] (1) In the present invention, a multi-stage condenser is used to condense the water vapor in the tail gas into liquid, and a gas-liquid separation device is used to achieve gas-liquid separation. This not only effectively removes water vapor and protects the vacuum device, avoiding production interruption and equipment maintenance due to damage to the vacuum device, but also helps to achieve environmentally friendly production of vacuum drying.

[0016] (2) In the present invention, the gas-liquid separation device adopts a double-layer tank structure, which can always maintain the vacuum balance state of the vacuum drying system, ensure that the removal of condensate will not affect the vacuum state of the vacuum drying system, and is conducive to maintaining the stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall system structure of this embodiment 1.

[0018] In the figure: multi-stage condenser 1, first-stage condenser 1-1, second-stage condenser 1-2, vapor-liquid separation device 2, cavity I 2-1, cavity II 2-2, air supply valve 2-3, vacuum balancing valve 2-4, overflow valve 2-5, liquid level gauge 2-6, vacuum pumping device 3, drain assembly 4, drain valve 4-1, first drain pump 4-2, second drain pump 4-3, first check valve 4-4, second check valve 4-5. DETAILED DESCRIPTION

[0019] The following are some improvements and modifications to the present invention in conjunction with the accompanying drawings, and these improvements and modifications should also be considered as within the scope of protection of the present invention. Example

[0020] like Figure 1 As shown, a condensation recovery device for vacuum drying includes a multi-stage condenser 1 and a vapor-liquid separation device 2, a vacuum pumping device 3 and a drainage component 4, wherein the tail gas inlet of the multi-stage condenser 1 is connected to the tail gas pipeline, the tail gas outlet of the multi-stage condenser 1 is connected to the air inlet end of the vapor-liquid separation device 2, the exhaust end of the vapor-liquid separation device 2 is connected to the vacuum pumping device 3, the multi-stage condenser 1 is connected to the refrigerant circulation pipeline, the condensate outlet of the multi-stage condenser 1 is connected to the liquid inlet of the vapor-liquid separation device 2 through the drainage pipe, and the condensate in the vapor-liquid separation device 2 is discharged through the drainage component 4 for subsequent waste liquid recovery treatment.

[0021] In this example 1, the multi-stage condenser 1 includes a first-stage condenser 1-1 and a second-stage condenser 1-2, and the exhaust gas outlet of the first-stage condenser 1-1 is connected to the exhaust gas inlet of the second-stage condenser 1-2. The condensates of the first-stage condenser 1-1 and the second-stage condenser 1-2 are merged and connected to the liquid inlet of the vapor-liquid separation device 2. The first-stage condenser 1-1 and the second-stage condenser 1-2 are connected in parallel with each other in the refrigerant circulation pipeline.

[0022] In this embodiment 1, the multi-stage condenser 1 can be designed with multiple condensers according to actual needs, and the tail gas pipelines of each stage of the condenser are connected end to end, and each stage of the condenser is connected in parallel in a refrigerant circulation pipeline. The refrigerant circulation pipeline can be filled with a corresponding refrigerant, such as cooling water, according to actual cooling needs.

[0023] In this embodiment 1, each condenser is provided with an outer shell cavity and an inner cavity. The outer shell cavity is used for introducing refrigerant, and the inner cavity is used for introducing dry exhaust gas. This is a conventional technology and is not described in detail.

[0024] In this embodiment 1, the vapor-liquid separation device 2 is a double-layer tank structure, comprising a cavity I 2-1 and a cavity II 2-2 arranged above and below. The air inlet of cavity I 2-1 is connected to the exhaust outlet of the multi-stage condenser 1, and the exhaust end of cavity I 2-1 is connected to the vacuum pump 3. Cavity I 2-1 is maintained in a vacuum state. Cavity I 2-1 and cavity II 2-2 are connected via a vacuum balancing valve 2-4. The overflow port of cavity I 2-1 is connected to cavity II 2-2 via an overflow valve 2-5. A drain assembly 4 is provided at the bottom of cavity II 2-2, and cavity II 2-2 is connected to an air supply pipe via an air supply valve 2-3. In the present utility model, the air supply pipe can be fed with a corresponding gas, such as nitrogen or compressed air, to balance the working pressure within the cavity according to actual needs.

[0025] In this embodiment 1, the drainage assembly 4 comprises a drainage valve 4-1, a first drainage pump 4-2, a second drainage pump 4-3, a first check valve 4-4, and a second check valve 4-5. The drainage valve 4-1 is disposed at the drainage end of the vapor-liquid separation device 3. The drainage pipeline is divided into two branches through the outlet end of the drainage valve 4-1. One branch is connected to the first drainage pump 4-2 and the first check valve 4-4 in sequence for waste liquid recovery, and the other branch is connected to the second drainage pump 4-3 and the second check valve 4-5 in sequence for waste liquid recovery. In this embodiment 1, the first drainage pump 4-2 and the second drainage pump 4-3 are both normal pressure drainage pumps. In the present utility model, the two drainage branches of the drainage assembly can be used together or as a single branch, one for use and the other for backup.

[0026] To ensure safe operation of the vapor-liquid separation device, vapor-liquid separation device 2 also includes a liquid level gauge 2-6. This level gauge 2-6 is located within the vapor-liquid separation device (chamber II 2-2) and is used to simultaneously monitor the maximum and minimum levels of the condensate. The level gauge 2-6 is connected to the drain valve 4-1, the first drain pump 4-2, and the second drain pump 4-3 for feedback. In this utility model, the level gauge 2-6 is a magnetic flap level gauge.

[0027] In this embodiment 1, the vacuuming device can be configured by those skilled in the art according to actual needs, and any existing equipment that can achieve vacuuming (such as a vacuum pump) can be applied.

[0028] The working principle of this embodiment 1 is as follows:

[0029] Refrigerant circulates through the refrigerant circulation pipes into the outer shell cavities of primary condenser 1-1 and secondary condenser 1-2, respectively. Dry exhaust gas, through the exhaust gas pipes, then passes through the internal cavities of primary condenser 1-1 and secondary condenser 1-2, exchanging heat with the refrigerant in the outer shell cavities for cooling. Water vapor, solvent, and other components in the exhaust gas condense into liquid and are discharged from the bottom of primary condenser 1-1 and secondary condenser 1-2 into chamber I2-1 of vapor-liquid separator 2.

[0030] The vapor-liquid separation device 2 regulates the operating pressure between chambers I2-1 and II2-2 by controlling the opening and closing of vacuum balancing valve 2-4. Chamber I2-1 is constantly under vacuum thanks to the vacuum pump 3. Chamber I2-1 directly collects condensed liquid (such as water and organic solvents such as methanol, ethanol, and methyl ketone) from the multi-stage condenser 1. Chamber II2-2, on the other hand, can indirectly receive condensed liquid discharged from chamber I2-1 by opening overflow valve 2-5 between chambers I2-1 and II2-2. At this time, controlling the opening of vacuum balancing valve 2-4 maintains a negative vacuum pressure in chamber II2-2. Subsequently, when the condensate in chamber II 2-2 needs to be drained, vacuum balancing valve 2-4 and relief valve 2-5 are closed, while air supply valve 2-3 is opened to introduce the appropriate gas (e.g., nitrogen, compressed air, etc.) into chamber II 2-2, thereby reducing the operating pressure in chamber II 2-2 from a vacuum state to a normal pressure state. At this point, the liquid level gauge 2-6 on the tank body of discharge valve 4-1 interlocks discharge valve 4-1, first discharge pump 4-2, and second discharge pump 4-3. Specifically, when the liquid level gauge 2-6 detects that the collected condensate has reached the highest liquid level, the drain valve 4-1, the first drain pump 4-2 and / or the second drain pump 4-3 can be opened to discharge the condensate in cavity II 2-2; when the liquid level gauge 2-6 detects that the collected condensate has reached the lowest liquid level, the liquid level gauge 2-6 gives a closing signal to close the drain valve 4-1, the first drain pump 4-2 and / or the second drain pump 4-3, thereby circulating and recovering the condensate.

[0031] In the present invention, vacuum balancing valve 2-4 and air supply valve 2-3 are interlocked. When chambers I 2-1 and II 2-2 need to simultaneously receive condensate, vacuum balancing valve 2-4 is opened. When liquid needs to be drained, vacuum balancing valve 2-4 is closed and air supply valve 2-3 is opened. In the present invention, air supply valve 2-3, vacuum balancing valve 2-4, and relief valve 2-5 can all be automatically controlled valves. Example

[0032] Based on Example 1, the vapor-liquid separation device 2 is a single-layer tank structure. The exhaust end of the single-layer tank is connected to the vacuum pump 3, and the single-layer tank is maintained in a vacuum state. The first and second liquid displacement pumps are both vacuum-type liquid displacement pumps. The remaining structure is the same as that of Example 1.

[0033] The above is only an explanation of the present invention and is a preferred embodiment of the present invention. It should be noted that those skilled in the art may make several improvements and modifications without departing from the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A condensation recovery device for vacuum drying, characterized in that: It includes a multi-stage condenser and a vapor-liquid separation device, a vacuum pumping device and a drainage component, wherein the tail gas inlet of the multi-stage condenser is connected to the tail gas pipeline, the tail gas outlet of the multi-stage condenser is connected to the air inlet end of the vapor-liquid separation device, the exhaust end of the vapor-liquid separation device is connected to the vacuum pumping device, the multi-stage condenser is connected to the refrigerant circulation pipeline, the condensate outlet of the multi-stage condenser is connected to the liquid inlet of the vapor-liquid separation device through the drainage pipe, and the condensate in the vapor-liquid separation device is discharged through the drainage component.

2. The condensation recovery device for vacuum drying according to claim 1, characterized in that: The multi-stage condenser includes a first-stage condenser and a second-stage condenser, and the exhaust gas outlet of the first-stage condenser is connected to the exhaust gas inlet of the second-stage condenser. The condensates of the first-stage condenser and the second-stage condenser are merged and connected to the liquid inlet of the vapor-liquid separation device. The first-stage condenser and the second-stage condenser are connected in parallel with each other in the refrigerant circulation pipeline.

3. The condensation recovery device for vacuum drying according to claim 1, characterized in that: The vapor-liquid separation device is a single-layer tank structure, the exhaust end of the single-layer tank is connected to the vacuum pumping device, and the single-layer tank maintains a vacuum state.

4. The condensation recovery device for vacuum drying according to claim 1, characterized in that: The vapor-liquid separation device is a double-layer tank structure, which includes a cavity I and a cavity II arranged upper and lower, wherein the air inlet end of cavity I is connected to the tail gas outlet of the multi-stage condenser, and the exhaust end of cavity I is connected to the vacuum pumping device. Cavity I maintains a vacuum state, and cavity I and cavity II are connected through a vacuum balancing valve. The overflow port of cavity I is connected to cavity II through an overflow valve. A drainage component is provided at the bottom end of cavity II, and cavity II is connected to the air supply pipeline through an air supply valve.

5. The condensation recovery device for vacuum drying according to claim 3 or 4, characterized in that: The drainage component includes a drainage valve, a first drainage pump, a second drainage pump, a first check valve and a second check valve. The drainage valve is arranged at the drainage end of the gas-liquid separation device. The drainage pipeline is divided into two branches through the outlet end of the drainage valve. One branch is connected to the first drainage pump and the first check valve in sequence for waste liquid recovery, and the other branch is connected to the second drainage pump and the second check valve in sequence for waste liquid recovery.

6. The condensation recovery device for vacuum drying according to claim 5, characterized in that: The vapor-liquid separation device also includes a liquid level gauge, and the liquid level gauges are respectively arranged in the vapor-liquid separation device to monitor the highest liquid level and the lowest liquid level of the condensate. The liquid level gauges are respectively connected to the drain valve, the first drain pump and the second drain pump for information feedback.

7. The condensation recovery device for vacuum drying according to claim 5, characterized in that: When the vapor-liquid separation device is a single-layer tank structure, the first liquid displacement pump and the second liquid displacement pump are both vacuum liquid displacement pumps.

8. The condensation recovery device for vacuum drying according to claim 5, characterized in that: When the vapor-liquid separation device is a double-layer tank structure, the first liquid displacement pump and the second liquid displacement pump are both normal pressure liquid displacement pumps.

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