阅读说明：本技术 冻干设备的冷阱液态氟利昂回收方法及系统 (Cold trap liquid Freon recovery method and system of freeze-drying equipment ) 是由 刘意强 吴建农 朱悉汝 毛海盈 田严华 于 2019-12-31 设计创作，主要内容包括：本发明提供一种冻干设备的冷阱液态氟利昂回收方法,包括步骤：a.将压缩机组排出的部分高温高压热气送入所述冷阱的盘管内部；b.通过所述高温高压气态氟利昂将所述盘管内留存的液态氟利昂冲入气液分离器。本发明还提供了一种冻干设备的冷阱融霜系统。根据本发明的方法及系统,利用压缩机组本身产生的高温高压气体氟利昂对冻干设备的冷阱进行液态氟利昂回收,经过对冷阱融霜后的高温高压气体氟利昂可以变成液体氟利昂再次进入气液分离器继续循环使用进行制冷,另一方面也节约了压缩机组和蒸发冷等制冷设备的能耗,提高了生产效率。进一步,根据本发明的方法及系统,其无需增加额外的设备和能耗,适用于各种场合,节约了人工和成本。(The invention provides a cold trap liquid Freon recovery method of freeze-drying equipment, which comprises the following steps: a. part of high-temperature and high-pressure hot gas discharged by a compressor unit is sent into the coil pipe of the cold trap; b. and flushing the liquid Freon retained in the coil into the gas-liquid separator by the high-temperature high-pressure gaseous Freon. The invention also provides a cold trap defrosting system of the freeze-drying equipment. According to the method and the system, the high-temperature high-pressure gas Freon generated by the compressor unit per se is utilized to recycle the liquid Freon in the cold trap of the freeze-drying equipment, the high-temperature high-pressure gas Freon subjected to defrosting on the cold trap can be changed into liquid Freon to enter the gas-liquid separator again for continuous recycling for refrigeration, and on the other hand, the energy consumption of the compressor unit, evaporation refrigeration equipment and the like is saved, and the production efficiency is improved. Furthermore, according to the method and the system, additional equipment and energy consumption are not needed, the method and the system are suitable for various occasions, and labor and cost are saved.)

1. A cold trap liquid Freon recovery method of freeze-drying equipment comprises the following steps:

a. sending high-temperature high-pressure gaseous Freon discharged by a compressor unit into the coil pipe of the cold trap;

b. and flushing the liquid Freon retained in the coil into the gas-liquid separator by the high-temperature high-pressure gaseous Freon.

2. The method of claim 1, further comprising, prior to step a: the liquid supply solenoid valve is closed and the supply of liquid freon to the cold trap is stopped.

3. The method of claim 2, further comprising, prior to step a: and closing the air return electromagnetic valve.

4. The method of claim 1, wherein step b further comprises: and heating the coil of the cold trap by utilizing sensible heat and latent heat of the high-temperature high-pressure gaseous Freon.

5. The method of claim 1, further comprising, after step b: the high-temperature high-pressure hot gas entering the cold trap coil pipe is subjected to heat exchange and liquefaction and then returns to the gas-liquid separator through the liquid discharge pipe.

6. A cold trap liquid freon recovery system for a lyophilization apparatus, the system configured with:

the air supply pipe is used for sending high-temperature and high-pressure gaseous Freon discharged by the compressor unit into the coil pipe of the cold trap; and

and the liquid discharge pipe is used for discharging the liquid Freon retained in the cold trap coil to the gas-liquid separator.

7. The system of claim 6, further comprising a supply line for supplying liquid freon to the cold trap and a return line and a return solenoid valve disposed in the return line.

8. The system of claim 7, wherein the supply line has a supply solenoid valve disposed therein, the supply line has a hot gas solenoid valve disposed therein, and the return line has a return solenoid valve disposed therein.

9. The system of claim 7, wherein the lyophilization apparatus is a lyophilization apparatus employing alternating cold traps.

10. A cold trap liquid freon recovery system of a lyophilization apparatus, the system configured with a processor to perform the method of claims 1-5.

Technical Field

The invention relates to freeze drying equipment, in particular to a method and a system for recovering cold trap liquid Freon of freeze drying equipment.

Background

The freeze drying equipment is also called vacuum freeze drying equipment, and is used for drying objects which are frozen into solid state, including food, by sublimating water in the objects under a vacuum environment. The sublimated water is transferred to a cold trap coil of the freeze-drying equipment and is re-condensed into ice. That is, in the freeze-drying process, the cold trap needs to continuously capture the water vapor generated by sublimation, and the ice formed by condensation of the water vapor on the coil of the cold trap needs to be defrosted at certain time intervals. In order to achieve continuous production without intervals, the prior art adopts alternate cold traps, wherein one part of cold traps works in a condensed water vapor water catching state, the other part of cold traps works in a defrosting and draining state, and the alternate time is different from dozens of minutes to hours. The cold trap defrosting of the freeze-drying equipment in the prior art mostly adopts spray type defrosting or steam type defrosting, and defrosting is carried out on the outer side of the cold trap coil pipe.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides an improved cold trap liquid Freon recovery method and system of freeze-drying equipment so as to solve the technical problems in the prior art.

According to one aspect of the present invention, there is provided a cold trap liquid freon recovery method of a freeze-drying apparatus, comprising the steps of:

a. sending part of high-temperature high-pressure gaseous Freon discharged by a compressor unit into the coil pipe of the cold trap;

b. and flushing the liquid Freon retained in the coil into the gas-liquid separator by the high-temperature high-pressure gaseous Freon.

The method further comprises the following steps: and melting the frost on the outer side of the coil pipe by utilizing the heat generated by the high-temperature and high-pressure hot gas.

The method further comprises, before the step a: closing the liquid supply electromagnetic valve and stopping supplying liquid Freon to the cold trap; and closing the air return electromagnetic valve.

The method further comprises the following steps: and sending the liquid Freon flushed out of the coil into a gas-liquid separator for next recycling.

The method, the step b further comprises: and heating the cold trap coil by utilizing sensible heat and latent heat of the high-temperature high-pressure hot gas.

The method further comprises, after the step b: the high-temperature high-pressure hot gas entering the cold trap coil pipe is subjected to heat exchange and liquefaction and then returns to the gas-liquid separator through the liquid discharge pipe.

According to another aspect of the present invention there is provided a cold trap liquid freon recovery system for a freeze drying apparatus, the system being configured with:

the air supply pipe is used for sending high-temperature and high-pressure gaseous Freon discharged by the compressor unit into the coil pipe of the cold trap; and

and the liquid discharge pipe is used for discharging the liquid Freon retained in the cold trap coil to the gas-liquid separator.

The system also includes a liquid supply tube for supplying liquid freon to the cold trap, an air return tube and an air return solenoid valve disposed in the air return tube.

Dispose the liquid supply solenoid valve in the pipeline of liquid supply pipe, dispose the steam solenoid valve in the pipeline of air supply pipe, dispose the return-air solenoid valve in the pipeline of return-air pipe.

The freeze-drying equipment adopts alternate cold traps.

According to another aspect of the present invention, there is provided a cold trap liquid freon recovery system for a lyophilization apparatus, the system configured with a processor to perform the method as described above.

According to the method and the system, the high-temperature high-pressure gas Freon generated by the compressor unit per se is utilized to flush the liquid Freon remained in the coil pipe into the gas-liquid separator for recycling, and meanwhile, the cold trap of the freeze-drying equipment is defrosted, so that on one hand, resources can be recycled, namely, the high-temperature high-pressure gas Freon defrosted by the cold trap can be changed into liquid Freon to enter the gas-liquid separator again for continuous recycling for refrigeration, on the other hand, the energy consumption of the compressor unit, the evaporation refrigeration equipment and the like is also saved, and the production efficiency is improved. Furthermore, according to the method and the system, additional equipment and energy consumption are not needed, the method and the system are suitable for various occasions, and labor and cost are saved.

Drawings

The invention may be better understood by describing embodiments thereof in conjunction with the following drawings, in which:

fig. 1 is a schematic view showing a freeze-drying apparatus for an alternate cold trap liquid freon recovery method using the freeze-drying apparatus according to the present invention.

Fig. 2 is a schematic block diagram showing an internal structure of the lyophilizing apparatus shown in fig. 1.

Fig. 3 is a schematic diagram showing a control system configuration of an alternate cold trap liquid freon recovery method using the lyophilization apparatus according to the present invention.

Fig. 4 is a flow chart illustrating operation of the system configuration shown in fig. 3.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below with reference to specific embodiments of the present invention and accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a schematic view showing a freeze-drying apparatus adopting an alternate cold trap liquid freon recovery method of the freeze-drying apparatus according to the present invention, and fig. 2 is a schematic block diagram showing an internal structure of the freeze-drying apparatus shown in fig. 1. Referring to fig. 1 and 2 in combination, the freeze-drying equipment adopting the cold trap liquid freon recovery method of the invention comprises a compressor unit 1, an evaporative cooling device 2, a liquid storage device 3, a fluorine oil return device 4, a gas-liquid separator 5, a freeze-drying bin 6 and a cold trap 7. It will be understood by those skilled in the art that the illustrated external appearance and internal structure of the freeze-drying apparatus is merely provided to aid in understanding the cold trap liquid freon recovery method and system employed in the present invention, and that the cold trap liquid freon recovery method and system of the present invention are not limited to the specific configuration illustrated. The cold trap liquid freon recovery method according to the present invention is generally applicable to a freeze-drying apparatus employing an alternating cold trap (not shown). Because the freeze-drying equipment adopting the alternating cold traps can perform alternating defrosting according to different process designated time of various articles including food, namely, the cold traps on one side perform refrigeration and water capture, and the cold traps on the other side perform defrosting and water drainage, the freeze-drying efficiency is higher than that of the traditional equipment only adopting a single cold trap. However, even if the freeze-drying equipment adopting the alternating cold trap is adopted, the cold trap defrosting method in the prior art still has defects, the liquid freon remained in the cold trap coil pipe in the alternating process is consumed in the defrosting process, on one hand, the remained liquid freon is vaporized in the non-working refrigeration process, on the other hand, the remained liquid freon prevents the defrosting effect to increase the defrosting cost, and the part of vaporized freon generated by defrosting again passes through the compressor unit 1 until the evaporation cooling device 2 is cooled and circulated into the liquid freon, so that the energy consumption of the compressor unit 1 and the evaporation cooling device 2 is increased.

According to the present invention shown in fig. 1 and 2, a high-temperature high-pressure gaseous freon (hereinafter, also referred to as hot gas) generated by the compressor unit 1 during operation is used for recovering and defrosting the liquid freon in the cold trap, that is, a part of the high-temperature high-pressure hot gas generated by the compressor unit 1 is sent into the coil of the cold trap 7 on one side of the alternate cold trap. This high-temperature high-pressure hot gas gets into the inside back of cold-trap coil pipe, can rush out the cold-trap coil pipe with about 90% liquid freon that retains in the cold-trap coil pipe on the one hand and get into vapour and liquid separator 5, waits for next cyclic utilization. On the other hand, the hot gas with high temperature and high pressure entering the cold trap coil can defrost the whole cold trap coil. Because the hot gas with high temperature and high heat directly enters the inside of the cold trap coil, the heat generated by the hot gas can be gathered in the coil and is concentrated to be diffused to the outside of the coil, so that the frost on the outside of the coil can be effectively melted. Compared with the prior scheme that the steam or waste hot gas defrosting is to heat and defrost the outer side of the cold trap coil after the steam or waste hot gas enters the space of the dry freezing bin, the cold trap defrosting mode according to the invention has the advantages that the high-temperature and high-pressure hot gas directly enters the cold trap coil, so that the dispersion of the hot gas in the space of the dry freezing bin 6 is avoided, and the defrosting efficiency is greatly improved.

And when the defrosting of the coil is finished by the hot gas entering the cold trap coil, a part of the hot gas is converted into liquid Freon through heat exchange, and the hot gas can directly enter the cold trap coil after gas-liquid separation is carried out on the gas-liquid separator 5 without circulation of the compressor unit 1 and the evaporative cooling device 2, so that the energy consumption of the compressor unit 1 and the evaporative cooling device 2 is saved.

Fig. 3 is a schematic diagram showing a cold trap defrosting system configuration of the alternate cold trap liquid freon recovery method using the lyophilization apparatus according to the present invention. Only one side of the defrosting system configuration of the alternating cold trap liquid freon recovery process is shown in fig. 3, and those skilled in the art will appreciate that the other side of the defrosting system configuration using the alternating cold trap liquid freon recovery process is substantially the same. Referring to fig. 3, the cold trap liquid freon recovery system of the lyophilization apparatus according to the present invention includes, for example, a liquid supply pipe 31, a gas supply pipe 32, a gas return pipe 33, and a liquid discharge pipe 34. Among them, a liquid supply solenoid valve 36 is disposed in the liquid supply pipe 31, a hot gas solenoid valve 37 is disposed in the gas supply pipe 32, and a return gas solenoid valve 38 is disposed in the return gas pipe 33. More specifically, for example, a shut valve, a filter, a differential pressure valve, a shut valve, a filter, an electromagnetic valve, a shut valve, and the like are provided in this order in the air supply pipe 32; a shut valve, a servo main valve, and the like are provided in the drain pipe 34 in this order (as shown in the drawing).

FIG. 4 is a schematic flow diagram of the operation of the system configuration of FIG. 3, with combined reference to FIGS. 3 and 4, step S1, with the system beginning to defrost the cold trap; step S2, the system closes the liquid supply solenoid valve 31 to stop supplying liquid freon (also called liquid refrigerant) to the cold trap; step S3, closing the return air solenoid valve 32; step S4, opening the hot gas electromagnetic valve 33, introducing hot gas exhausted by a compressor unit of an oil separator (not shown) into a cold trap, heating the coil of the cold trap by utilizing sensible heat and latent heat of the hot gas, and eliminating frost on the outer surface of the coil to achieve the aim of defrosting, wherein meanwhile, after the high-temperature and high-pressure hot gas enters the inside of the coil of the cold trap, about 90% of liquid Freon remained in the coil of the cold trap can be flushed out of the coil of the cold trap and then enters the gas-liquid separator 5 to wait for the next recycling; step S5, the hot gas entering the cold trap is returned to the gas-liquid separator 5 through a liquid discharge pipe after heat exchange and liquefaction; and step S6, opening the air return electromagnetic valve 32 and the liquid supply electromagnetic valve 31 respectively to enable the freeze-drying equipment to carry out refrigeration cycle again.

The cold trap liquid freon recovery method and system of the freeze-drying device according to the present invention can be implemented by a computer, for example, the operation process shown in fig. 4 can be executed by a computer, and in a preferred embodiment, the operation process shown in fig. 4 can be stored in a computer readable storage medium, for example, and executed by a computer. Of course, according to another embodiment of the present invention, the cold trap liquid freon recovery method described above may also be performed by manual operation or simple program operation.

According to another embodiment of the present invention, the cold trap liquid freon recovery method of the freeze-drying equipment of the present invention can also be applied to non-alternating cold trap liquid freon recovery, which can be determined according to specific application environments.

Various changes and modifications may be suggested to one skilled in the art based on the teachings herein, but are within the scope of the appended claims.