Rapid liquefied nitrogen device

Abstract

The utility model provides a rapid nitrogen liquefying device which comprises a PSA (Pressure Swing Adsorption) nitrogen making machine, a cold insulation box, a liquefying module arranged in the cold insulation box and used for liquefying gaseous nitrogen, and a circulating cooling module communicated with the liquefying module and used for receiving nitrogen generated by the PSA nitrogen making machine. The non-liquefied nitrogen is conveyed and cooled; wherein nitrogen produced by the PSA nitrogen making machine is conveyed into the circulating cooling module, after being cooled by the circulating cooling module, the nitrogen is conveyed into the liquefying module to be liquefied, part of the nitrogen is liquefied by the liquefying module, part of the nitrogen returns to the circulating cooling module to be circularly cooled, and the liquefied nitrogen is discharged through the liquefying module to be stored. Nitrogen can be rapidly generated through the PSA nitrogen making machine, and part of cooled nitrogen is liquefied into liquid nitrogen to be discharged and stored through the arrangement of the liquefaction module and the circulating cooling module, so that the nitrogen is conveniently stored while the nitrogen is rapidly obtained.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure swing adsorption nitrogen making technology field, concretely relates to a quick liquefied nitrogen device. BACKGROUND

[0002] Nitrogen is a key gas resource in industrial production and scientific research, and is widely used in many fields. In the electronics industry, nitrogen provides a protective atmosphere for electronic component production, effectively preventing oxidation. In the chemical industry, nitrogen acts as a protective gas in the production process of chemical products, ensuring production safety and product quality. In the food packaging industry, nitrogen is used for nitrogen packaging to extend the shelf life of food. In the medical industry, nitrogen provides necessary gas support for the operation of medical equipment. Currently, pressure swing adsorption nitrogen making and cryogenic air separation nitrogen making are two mainstream nitrogen making methods, each with its own characteristics and limitations.

[0003] Pressure swing adsorption nitrogen making (PSA nitrogen making) process is relatively simple, and nitrogen can be produced within 30 minutes after starting, with high efficiency. However, the produced nitrogen is at room temperature and low pressure, and it is difficult to store a large amount due to the low density of nitrogen at room temperature and atmospheric pressure, limiting its application and continuous supply.

[0004] Cryogenic air separation nitrogen making produces high-purity and high-yield nitrogen, which can meet the needs of large-scale industrial production, but this method usually takes 48 hours to produce products, with a complex process and a large number of equipment. Nitrogen needs to be separated in a fractionating column at low temperature, which is affected by the number of trays, tray efficiency and heat exchange efficiency in the cold box. The size of the cold box is generally large, with a height of the cold box containing the upper and lower towers of about 50 meters, and some even as high as 60 meters, resulting in a fixed structure of the cryogenic nitrogen making device. A simple deep cooling method liquefied nitrogen device often needs to be equipped with a fixed air separation device to obtain a source of nitrogen products. At the same time, the deep cooling air separation nitrogen making occupies a large area and requires a large initial investment, which restricts its application and promotion in specific scenarios.

[0005] Therefore, the utility model provides a quick liquefied nitrogen device. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a quick liquefied nitrogen device to solve the problem that the existing nitrogen making device cannot simultaneously meet the requirements of quick nitrogen making and convenient nitrogen storage in the background technology.

[0007] In order to achieve the above object, the utility model provides a kind of quick liquefied nitrogen device, including PSA nitrogen generator and cold insulation tank, be installed in cold insulation tank for the liquefaction module of gaseous nitrogen is liquefied, with the circulation cooling module being communicated with liquefaction module, the circulation cooling module is used to receive the nitrogen gas generated by PSA nitrogen generator, and the nitrogen gas that is not liquefied is transported and cooled;Wherein, the nitrogen gas made by PSA nitrogen generator is transported into circulation cooling module, after being cooled by circulation cooling module, it is transported into liquefaction module and is liquefied, and part of nitrogen gas is liquefied by liquefaction module, part of nitrogen gas is recycled in circulation cooling module, and the liquefied nitrogen gas is discharged by liquefaction module and is stored.

[0008] Optionally, the liquefaction module includes a plate heat exchanger installed in the cold insulation tank, a liquid nitrogen product pipe and a circulating nitrogen pipe connected to the plate heat exchanger, the liquid nitrogen product is discharged from the cold insulation tank through the liquid nitrogen product pipe, and the circulating nitrogen pipe is used to re-transport the nitrogen gas that is not liquefied to the circulation cooling module.

[0009] Optionally, the circulation cooling module includes a gas shaft expander booster end, an air-cooled cooler connected to the gas shaft expander booster end, an air-cooled low-temperature ice machine connected to the air-cooled cooler, a gas shaft expander expansion end connected to the air outlet end of the air-cooled low-temperature ice machine, and an air-cooled circulating nitrogen compressor connected to the gas shaft expander expansion end.

[0010] Optionally, the gas shaft expander booster end is located outside the cold insulation tank, and the gas shaft expander expansion end is located inside the cold insulation tank.

[0011] Optionally, the gas inlet end of the gas shaft expander booster end is connected to the gas outlet end of the air-cooled circulating nitrogen compressor and the gas outlet end of the PSA nitrogen generator through a pipeline, and the gas outlet end of the gas shaft expander booster end is connected to the gas inlet end of the air-cooled cooler through a pipeline.

[0012] Optionally, the gas outlet end of the air-cooled cooler is connected to the gas inlet end of the air-cooled low-temperature ice machine through a pipeline.

[0013] Optionally, the gas outlet end of the air-cooled low-temperature ice machine is connected to the plate heat exchanger, the gas inlet end of the gas shaft expander expansion end is connected to the plate heat exchanger through the circulating nitrogen pipe, and the gas outlet end of the gas shaft expander expansion end is connected to the gas inlet end of the air-cooled circulating nitrogen compressor through a pipeline.

[0014] Optionally, the pipeline for connecting the air-cooled cooler and the air-cooled low-temperature ice machine is connected to the plate heat exchanger for heat exchange.

[0015] Optionally, the pipeline for connecting the gas shaft expander expansion end and the air-cooled circulating nitrogen compressor is connected to the plate heat exchanger for heat exchange.

[0016] Optionally, a liquid nitrogen storage tank is connected to the liquid nitrogen product pipe.

[0017] Optionally, the PSA nitrogen generator, cold storage tank, liquefaction module and circulating cooling module can be installed in a skid package.

[0018] Compared with the prior art, the quick liquefied nitrogen device has the following beneficial effects:

[0019] The quick liquefied nitrogen device, since the PSA nitrogen generator is used for nitrogen generation, can quickly generate nitrogen, and through the setting of the liquefaction module and the circulating cooling module, the nitrogen generated by the PSA nitrogen generator is circulated and cooled, and in the process of circulating cooling, part of the cooled nitrogen is liquefied to form liquid nitrogen for discharge and storage, so that nitrogen can be obtained quickly and stored conveniently. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the utility model.

[0021] In the figure, 1 is a PSA nitrogen generator, 2 is a cold storage tank, 3 is a liquefaction module, 31 is a plate heat exchanger, 32 is a liquid nitrogen product pipe, 321 is a liquid nitrogen storage tank, 33 is a circulating nitrogen pipe, 4 is a circulating cooling module, 41 is a gas shaft expander booster end, 42 is an air-cooled cooler, 43 is an air-cooled low-temperature ice machine, 44 is a gas shaft expander expansion end, and 45 is an air-cooled circulating nitrogen compressor. DETAILED DESCRIPTION

[0022] The following will be described in detail in combination with the drawings and specific implementation. In the following description, many specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0023] The quick liquefied nitrogen device of the present application can be applied to occasions, of course, it can also be used in other similar application scenarios, and a quick liquefied nitrogen device will be described in detail below.

[0024] Referring to the accompanying Figure 1 As shown in the figure, a structure schematic diagram of the preferred embodiment of the quick liquefied nitrogen device of the present application is shown. The quick liquefied nitrogen device comprises a PSA nitrogen generator 1 and a cold storage tank 2, a liquefaction module 3 installed in the cold storage tank 2 for liquefying gaseous nitrogen, and a circulating cooling module 4 connected to the liquefaction module 3, the circulating cooling module 4 is used for receiving the nitrogen generated by the PSA nitrogen generator 1 and transporting and cooling the unliquefied nitrogen.

[0025] The utility model discloses a quick nitrogen production device, which comprises a PSA nitrogen production machine 1, a cold insulation box 2, a liquefaction module 3 and a circulating cooling module 4.

[0026] Referring to the accompanying drawings Figure 1 As shown in the drawings, the liquefaction module 3 comprises a plate heat exchanger 31 installed in the cold insulation box 2, a liquid nitrogen product pipe 32 and a circulating nitrogen pipe 33 connected to the plate heat exchanger 31. The liquid nitrogen product is discharged from the cold insulation box 2 through the liquid nitrogen product pipe 32, and the circulating nitrogen pipe 33 is used to deliver the nitrogen gas that has not been liquefied to the circulating cooling module 4.

[0027] The utility model discloses a plate heat exchanger 31, for liquefying nitrogen gas, discharging the liquid nitrogen obtained by liquefaction through the liquid nitrogen product pipe 32, and delivering the nitrogen gas that has not been liquefied to the circulating cooling module 4 through the circulating nitrogen pipe 33 for recirculation cooling.

[0028] Referring to the accompanying drawings Figure 1 As shown in the drawings, the circulating cooling module 4 comprises a gas shaft expander booster end 41, an air cooling cooler 42 connected to the gas shaft expander booster end 41, an air cooling low-temperature ice machine 43 connected to the air cooling cooler 42, a gas shaft expander expansion end 44 connected to the air outlet end of the air cooling low-temperature ice machine 43, and an air cooling circulating nitrogen compressor 45 connected to the gas shaft expander expansion end 44. The gas shaft expander booster end 41 is located outside the cold insulation box 2, and the gas shaft expander expansion end 44 is located inside the cold insulation box 2.

[0029] The circulating cooling module 4 of the utility model delivers the nitrogen gas generated by the PSA nitrogen production machine 1 to the gas shaft expander booster end 41 through a pipeline, enters the air cooling cooler 42 after being pressurized by the gas shaft expander booster end 41, is cooled by air cooling, and is delivered into the air cooling low-temperature ice machine 43 after being cooled by the air cooling cooler 42 and being heat-exchanged with the plate heat exchanger 31 through a pipeline. The nitrogen gas cooled by the air cooling low-temperature ice machine 43 is delivered into the plate heat exchanger 31 through a pipeline. The nitrogen gas that has not been liquefied enters the gas shaft expander expansion end 44 through the circulating nitrogen pipe 33 to expand. The expanded gas is heat-exchanged with the plate heat exchanger 31 again, is pressurized by the air cooling circulating nitrogen compressor 45, is mixed with the newly produced nitrogen gas by the PSA nitrogen production machine 1, and enters the gas shaft expander booster end 41 again.

[0030] Referring to the accompanying Figure 1 As shown in the figure, the liquid nitrogen product pipe 32 is connected with a liquid nitrogen storage tank 321, and the liquid nitrogen can be stored through the liquid nitrogen storage tank 321; in addition, the PSA nitrogen generator 1, the cold insulation tank 2, the liquefaction module 3 and the circulating cooling module 4 in the application can be pry-mounted and installed; the application can make nitrogen through the PSA nitrogen generator 1, and the nitrogen can be cooled and liquefied through the circulating cooling module 4 and the liquefaction module 3, so that the nitrogen can be stored.

[0031] Referring to the accompanying Figure 1 The specific implementation process of the utility model is as follows:

[0032] Firstly, the PSA nitrogen generator 1 starts to make nitrogen, mixes the made nitrogen and the nitrogen pressurized by the air-cooled circulating nitrogen compressor 45, and enters into the gas shaft expander pressurizing end 41, the nitrogen is pressurized through the gas expansion pressurizing section, the pressurized nitrogen is heat-exchanged and cooled with the plate heat exchanger 31, then enters into the air-cooled low-temperature ice machine 43 for further cooling, and the cooled nitrogen returns to the plate heat exchanger 31, part of the nitrogen is extracted and sent into the gas shaft expander expansion end 44 for expansion, the temperature of the expanded gas drops rapidly, the expanded nitrogen is transported into the plate heat exchanger 31 as a cold source to heat-exchange and liquefy the nitrogen, and the liquefied nitrogen is transported into the liquid nitrogen storage tank 321 through the liquid nitrogen product pipe 32; and the nitrogen expanded and heat-exchanged enters into the air-cooled circulating nitrogen compressor 45 for pressurization and circulation, and is mixed with the new nitrogen generated by the PSA nitrogen generator 1, and the process is repeated.

[0033] The utility model combines the advantages of the PSA nitrogen generator 1 for rapid nitrogen production and the advantages of the deep cooling equipment for liquefying nitrogen for storage, so that the nitrogen is liquefied for storage on the basis of rapid nitrogen production, the volume of the application is smaller than that of the distillation column of the deep cooling equipment, and the application can be pry-mounted and installed or modularly installed, so that the whole nitrogen production device can be easily carried and transported; in addition, the application adopts air-cooled heat exchange, which is easier to maintain and use than the traditional water-mediated cooling method; finally, only the air-cooled circulating nitrogen compressor 45 and the air-cooled low-temperature ice machine 43 in the application need to consume electric energy, so that the energy consumption of the application is lower than that of the deep cooling air separation equipment.

[0034] The above examples are illustrative of the application, but not limiting the application, and any simple transformation of the application belongs to the protection scope of the application.

Claims

1. A quick liquefied nitrogen device comprising a PSA nitrogen generator (1), characterized in that, It also comprises a cold storage tank (2), a liquefaction module (3) installed in the cold storage tank (2) for liquefying gaseous nitrogen, and a circulating cooling module (4) connected with the liquefaction module (3), which is used for receiving the nitrogen generated by the PSA nitrogen generator (1) and transporting and cooling the unliquefied nitrogen. The nitrogen generated by the PSA nitrogen generator (1) is transported into the circulating cooling module (4), cooled by the circulating cooling module (4), and then transported into the liquefaction module (3) for liquefaction, while part of the nitrogen is liquefied by the liquefaction module (3), part of the nitrogen is returned to the circulating cooling module (4) for circulating cooling, and the liquefied nitrogen is discharged from the liquefaction module (3) for storage.

2. The quick-liquefying nitrogen device of claim 1, wherein, The liquefaction module (3) comprises a plate heat exchanger (31) installed in the cold storage tank (2), a liquid nitrogen product pipe (32) and a circulating nitrogen pipe (33) connected with the plate heat exchanger (31), the liquid nitrogen product is discharged from the cold storage tank through the liquid nitrogen product pipe (32), and the circulating nitrogen pipe (33) is used for re-transporting the unliquefied nitrogen into the circulating cooling module (4).

3. The quick-liquefying nitrogen device of claim 2, wherein, The circulating cooling module (4) comprises a gas shaft expander booster end (41), an air-cooled cooler (42) connected with the gas shaft expander booster end (41), a plate heat exchanger (31) connected with the air-cooled cooler (42), an air-cooled low-temperature ice machine (43) connected with the plate heat exchanger (31), a gas shaft expander expansion end (44) connected with the air outlet end of the air-cooled low-temperature ice machine (43), and an air-cooled circulating nitrogen compressor (45) connected with the gas shaft expander expansion end (44).

4. The quick-liquefying nitrogen device of claim 3, wherein, The gas shaft expander booster end (41) is located outside the cold storage tank (2), and the gas shaft expander expansion end (44) is located inside the cold storage tank (2).

5. The quick-liquefying nitrogen device of claim 3, wherein, The gas inlet end of the gas shaft expander booster end (41) is connected with the gas outlet end of the air-cooled circulating nitrogen compressor (45) and the gas outlet end of the PSA nitrogen generator (1) through pipelines, and the gas outlet end of the gas shaft expander booster end (41) is connected with the gas inlet end of the air-cooled cooler (42) through a pipeline; The gas outlet end of the air-cooled cooler (42) is connected with the gas inlet end of the air-cooled low-temperature ice machine (43) through a pipeline; The gas outlet end of the air-cooled low-temperature ice machine (43) is connected with the plate heat exchanger (31); The gas inlet end of the gas shaft expander expansion end (44) is connected with the plate heat exchanger (31) through the circulating nitrogen pipe (33), and the gas outlet end of the gas shaft expander expansion end (44) is connected with the gas inlet end of the air-cooled circulating nitrogen compressor (45) through a pipeline.

6. The quick-liquefying nitrogen device of claim 5, wherein, The pipeline for connecting the air-cooled cooler (42) and the air-cooled low-temperature ice machine (43) is connected with the plate heat exchanger (31) for heat exchange; The pipeline for connecting the gas shaft expander expansion end (44) and the air-cooled circulating nitrogen compressor (45) is connected with the plate heat exchanger (31) for heat exchange.

7. The quick-liquefying nitrogen device of claim 2, wherein, The liquid nitrogen product pipe (32) is connected with a liquid nitrogen storage tank (321).

8. The rapid liquefier of nitrogen according to any one of claims 1 to 7, characterized in that, The PSA nitrogen generator (1), the cold storage tank (2), the liquefaction module (3) and the circulating cooling module (4) can be installed in a skid-mounted manner.

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