CN219804413U - Purification device for preparing pure nitrogen by utilizing industrial nitrogen - Google Patents
Purification device for preparing pure nitrogen by utilizing industrial nitrogen Download PDFInfo
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- CN219804413U CN219804413U CN202321014469.1U CN202321014469U CN219804413U CN 219804413 U CN219804413 U CN 219804413U CN 202321014469 U CN202321014469 U CN 202321014469U CN 219804413 U CN219804413 U CN 219804413U
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- conveying pipe
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 312
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 152
- 238000000746 purification Methods 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 83
- 238000001179 sorption measurement Methods 0.000 claims abstract description 81
- 239000002808 molecular sieve Substances 0.000 claims abstract description 77
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 77
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 67
- 238000003860 storage Methods 0.000 claims abstract description 32
- 238000003795 desorption Methods 0.000 claims description 27
- 230000001105 regulatory effect Effects 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 description 27
- 238000000034 method Methods 0.000 description 15
- 239000012535 impurity Substances 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 13
- 229910001873 dinitrogen Inorganic materials 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- 239000000306 component Substances 0.000 description 7
- 238000000926 separation method Methods 0.000 description 6
- 239000012159 carrier gas Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000003463 adsorbent Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000407 epitaxy Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Separation Of Gases By Adsorption (AREA)
Abstract
The utility model relates to a purification device for preparing pure nitrogen by utilizing industrial nitrogen, which comprises a first industrial nitrogen conveying pipe, wherein the first industrial nitrogen conveying pipe is provided with a low-pressure buffer tank, a nitrogen compressor, a first one-way valve, an electric heater and a high-pressure buffer tank, the high-pressure buffer tank is sequentially communicated with a carbon powder storage tank, a variable-temperature gas conveying pipe and a first adsorption device, the variable-temperature gas conveying pipe is provided with a first heat exchanger, the first adsorption device comprises a molecular sieve adsorption tank, a molecular sieve layer arranged in the molecular sieve adsorption tank and a pure nitrogen conveying pipe arranged on the molecular sieve adsorption tank, the molecular sieve adsorption tank is provided with a first conveying pipe, a first high-temperature nitrogen conveying pipe is arranged between the first conveying pipe and the high-pressure buffer tank, and the low-pressure buffer tank and the high-pressure buffer tank are both provided with first temperature sensors. The utility model is convenient to adjust and use, and has wide market prospect.
Description
Technical Field
The utility model relates to the field of purification equipment for preparing pure nitrogen from industrial nitrogen, in particular to a purification device for preparing pure nitrogen from industrial nitrogen.
Background
The gas is used as a protective gas and carrier gas in the manufacture of integrated circuits, semiconductors and electric vacuum devices, as a carrier gas in chemical vapor deposition, as a carrier gas in a liquid diffusion source, and as a protective gas for devices in a high temperature diffusion furnace. High purity nitrogen is used as a displacement, drying, storage and transportation gas in the steps of epitaxy, photolithography, cleaning, evaporation, and the like. In the manufacture of kinescope, the purity of nitrogen is required to be 99.99% or more. In aerospace technology, the liquid hydrogen filling system must be replaced with high purity nitrogen first and then with high purity helium. The technical index of industrial nitrogen is expressed in GB/T3864-2008 industrial nitrogen, namely, the nitrogen content is not less than 99.2 percent (volume fraction), the nitrogen with the oxygen content not more than 0.8 percent (volume fraction) is the qualified industrial nitrogen finished product, and the component with the largest impurity proportion in the industrial nitrogen is oxygen. Technical indexes of pure nitrogen, high-purity nitrogen and ultra-pure nitrogen are expressed in GB/T8979-2008 'pure nitrogen, high-purity nitrogen and ultra-pure nitrogen', and the nitrogen content in the pure nitrogen, the high-purity nitrogen and the ultra-pure nitrogen is sequentially increased. The nitrogen content of the pure nitrogen was 99.99% (volume fraction).
The technical purpose of further preparing pure nitrogen by using industrial nitrogen as a raw material is to transform oxygen impurities contained in the industrial nitrogen or directly perform a deoxidization process to form deoxidization intermediate gas, and the generated deoxidization intermediate gas is used for further absorbing the impurities transformed by the oxygen and other impurity gases contained in the industrial nitrogen by using a downstream adsorption device so as to obtain the pure nitrogen; no matter which deoxidization mode is carried out, the downstream adsorption device is required to adsorb impurities in deoxidized intermediate gas, and a plurality of adsorption devices which are connected in parallel are usually arranged in order to ensure that the adsorption process can continuously run the existing process. However, when the adsorption reaches the upper limit of the adsorption of the adsorbent, the impurities adsorbed by the adsorbent need to be desorbed, and the desorption process of the adsorbent is realized by using high-temperature gas as carrier gas, and in the prior art, the desorption gas needs to be supplied by separate high-temperature gas, so that the structure of the purification device is further complicated.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides the purification device for preparing pure nitrogen by utilizing industrial nitrogen, which can utilize high-temperature intermediate gas formed by heating industrial nitrogen so as to facilitate deoxidization transformation, and can utilize part of the intermediate gas as an adsorption device to analyze gas so as to simplify the product structure, thereby overcoming the defects in the prior art.
The utility model adopts the technical scheme that: the utility model provides a purification device that pure nitrogen was prepared to utilizing industry nitrogen, includes first industry nitrogen gas conveyer pipe, and first industry nitrogen gas conveyer pipe has set gradually low pressure buffer tank, nitrogen compressor, first check valve, electric heater and high pressure buffer tank along the entrance point of first industry nitrogen gas conveyer pipe to the exit point direction of first industry nitrogen gas conveyer pipe, has linked gradually carbon powder storage tank, alternating temperature gas conveyer pipe and first adsorption equipment on the high pressure buffer tank, is provided with first heat exchanger on the alternating temperature gas conveyer pipe, is provided with the carbon powder layer in the carbon powder storage tank, first adsorption equipment include two at least molecular sieve adsorption tanks, the pure nitrogen conveyer pipe of equipartition's molecular sieve layer and a plurality of molecular sieve adsorption tank on each molecular sieve adsorption tank, all be provided with first conveyer pipe on each molecular sieve adsorption tank respectively, be linked together through first high temperature nitrogen gas conveyer pipe between a plurality of first conveyer pipe and the high pressure buffer tank, be provided with first governing valve on the high pressure buffer tank on the first high temperature buffer tank respectively.
Preferably, one end of each molecular sieve adsorption tank close to the first conveying pipe is communicated with the pure nitrogen conveying pipe through a second conveying pipe; one end of each molecular sieve adsorption tank far away from the first conveying pipe is communicated with the variable-temperature gas conveying pipe through a third conveying pipe respectively, a fourth conveying pipe is arranged at one end of each molecular sieve adsorption tank far away from the first conveying pipe, and a plurality of fourth conveying pipes are communicated with the first desorption gas discharge pipe.
Preferably, the low-pressure buffer tank and the high-pressure buffer tank are respectively provided with a safety valve and a pressure sensor.
Preferably, a second temperature sensor is arranged on the variable temperature gas conveying pipe between the first adsorption device and the first heat exchanger, and a first filter is arranged on the variable temperature gas conveying pipe between the carbon powder storage tank and the first heat exchanger.
Preferably, the carbon powder storage tank is provided with deoxidizing pipes, and the deoxidizing pipes on two sides of the carbon powder storage tank are respectively provided with a first stop valve; the number of the carbon powder storage tanks is a plurality, and the carbon powder storage tanks are mutually connected in parallel; each carbon powder storage tank is communicated with the high-pressure buffer tank through a second high-temperature nitrogen conveying pipe, and a second regulating valve is arranged on the second high-temperature nitrogen conveying pipe.
Preferably, the first desorption gas discharge pipe and the pure nitrogen delivery pipe are respectively provided with a first online chromatograph.
The utility model has the beneficial effects that: firstly, the part of the high-temperature nitrogen stored in the high-pressure buffer tank and to be deoxidized through the carbon powder layer in the carbon powder storage tank is used as desorption gas for adsorbing impurity gas by the molecular sieve layer in the analysis molecular sieve adsorption tank, so that the product configuration that the molecular sieve layer in the molecular sieve adsorption tank is used as desorption gas by singly and independently heating gas is replaced; thereby simplifying the complexity of the overall device.
Secondly, a first online chromatograph is respectively arranged on the first desorption gas discharge pipe and the pure nitrogen delivery pipe. The first on-line chromatograph is installed to facilitate feedback of the gas component content.
Finally, the utility model provides a heat source channel of the second heat exchanger on the compressed air conveying pipe between the third regulating valve and the freeze dryer. Compressed air pressurized by the air compressor unit firstly enters a heat source channel of the second heat exchanger and a continuously conveyed cold source in a cold source channel of the second heat exchanger to exchange heat, so that the temperature of gas entering the freeze dryer is reduced.
The utility model has the advantages of simple structure, convenient operation, ingenious design, great improvement of working efficiency, good social and economic benefits and easy popularization and use.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is a schematic structural view of the present utility model.
Detailed Description
Example 1: as shown in FIG. 1, a purification device for preparing pure nitrogen by using industrial nitrogen comprises a first industrial nitrogen conveying pipe 1, wherein the first industrial nitrogen conveying pipe 1 is sequentially provided with a low-pressure buffer tank 2, a nitrogen compressor 3, a first one-way valve 4, an electric heater 5 and a high-pressure buffer tank 6 along the direction from the inlet end of the first industrial nitrogen conveying pipe 1 to the outlet end of the first industrial nitrogen conveying pipe 1, the high-pressure buffer tank 6 is sequentially communicated with a carbon powder storage tank 7, a temperature-changing gas conveying pipe 8 and a first adsorption device, the temperature-changing gas conveying pipe 8 is provided with a first heat exchanger 9, the carbon powder storage tank 7 is internally provided with a carbon powder layer 10, the first adsorption device comprises at least two molecular sieve adsorption tanks 11, molecular sieve layers 12 respectively arranged in each molecular sieve adsorption tank 11 and pure nitrogen conveying pipes 13 respectively communicated with the plurality of molecular sieve adsorption tanks 11, each molecular sieve adsorption tank 11 is respectively provided with a first conveying pipe 14, a plurality of first conveying pipes 14 are respectively communicated with the high-pressure buffer tank 6 through a first high-temperature nitrogen conveying pipe 15, the first high-pressure buffer tank 15 is respectively provided with a first temperature-changing buffer tank 16, and a first temperature-sensing buffer tank 17 is respectively arranged on the first high-pressure buffer tank 6, and a first temperature-changing buffer tank 16 is respectively provided with a first temperature-changing valve 17. The low-pressure buffer tank 2 is provided with a first temperature sensor 17 which is convenient for the temperature parameters of industrial nitrogen which is not pressurized by the nitrogen compressor 3 and heated by the electric heater 5; under the condition that the nitrogen compressor 3 is pressurized at a certain level, the output power of the electric heater 5 can be further adjusted according to the temperature parameter fed back by the first temperature sensor 17 installed on the low-pressure buffer tank 2, so that industrial nitrogen reaches a preset temperature range, and the industrial nitrogen is fed back through the first temperature sensor 17 installed on the high-pressure buffer tank 6.
One end of each molecular sieve adsorption tank 11 close to the first conveying pipe 14 is communicated with the pure nitrogen conveying pipe 13 through a second conveying pipe 18; the end of each molecular sieve adsorption tank 11 far away from the first conveying pipe 14 is communicated with the temperature-changing gas conveying pipe 8 through a third conveying pipe 19, a fourth conveying pipe 20 is arranged at the end of each molecular sieve adsorption tank 11 far away from the first conveying pipe 14, and a plurality of fourth conveying pipes 20 are communicated with a first desorption gas discharge pipe 21.
The low-pressure buffer tank 2 and the high-pressure buffer tank 6 are respectively provided with a safety valve 22 and a pressure sensor 23. The pressure sensor 23 is installed to facilitate feedback of the pressure parameter. It is also convenient to operate the relief valve 22 for relief of pressure according to the pressure parameter fed back by the pressure sensor 23.
A second temperature sensor 24 is arranged on the variable temperature gas conveying pipe 8 between the first adsorption device and the first heat exchanger 9, and a first filter 25 is arranged on the variable temperature gas conveying pipe 8 between the carbon powder storage tank 7 and the first heat exchanger 9. After passing through the carbon powder layer 10 installed in the carbon powder storage tank 7, part of solid particles are inevitably carried in the gas, so that the first filter 25 is additionally arranged to filter the gas passing through the carbon powder layer 10 so as to remove the solid particles carried in the gas.
The carbon powder storage tank 7 is provided with an oxygen removal pipe 26, and the oxygen removal pipes 26 on two sides of the carbon powder storage tank 7 are respectively provided with a first stop valve 27; the number of the carbon powder storage tanks 7 is a plurality, and the carbon powder storage tanks 7 are mutually connected in parallel; each carbon powder storage tank 7 is communicated with the high-pressure buffer tank 6 through a second high-temperature nitrogen conveying pipe 28, and a second regulating valve 29 is arranged on the second high-temperature nitrogen conveying pipe 28. A first online chromatograph 30 is arranged on each of the first desorption gas discharge pipe 21 and the pure nitrogen delivery pipe 13. The first in-line chromatograph 30 is installed to facilitate feedback of the gas component content.
The application method of the product is as follows: as shown in fig. 1, first, the industrial nitrogen production apparatus feeds industrial nitrogen product gas into the low pressure buffer tank 2, and feeds back temperature parameters and pressure parameters through the first temperature sensor 17 and the pressure sensor 23 mounted on the low pressure buffer tank 2; then, pressurizing through the nitrogen compressor 3, heating through the electric heater 5, and then sending into the high-pressure buffer tank 6 to form high-temperature nitrogen, wherein the high-pressure buffer tank 6 continuously conveys the high-temperature nitrogen to the carbon powder storage tank 7, and oxygen in the high-temperature nitrogen is continuously consumed in the process of passing through the carbon powder layer 10 arranged in the carbon powder storage tank 7 to form high-temperature intermediate gas; then, after being sent into the variable temperature gas conveying pipe 8 and filtered by the first filter 25, the variable temperature gas is sent into the heat source channel of the first heat exchanger 9 and the cold source continuously sent into the cold source channel of the first heat exchanger 9 for heat exchange, the high temperature intermediate gas discharged from the heat source channel of the first heat exchanger 9 is cooled to form low temperature intermediate gas, the low temperature intermediate gas is sent into the molecular sieve adsorption tank 11 under the working state, impurities such as carbon dioxide and the like carried in the low temperature intermediate gas passing through the molecular sieve layer 12 in the molecular sieve adsorption tank 11 are gradually increased by the nitrogen content in the low temperature intermediate gas adsorbed by the molecular sieve layer 12, and finally the nitrogen content is fed into the pure nitrogen conveying pipe 13 to be sent out as a pure nitrogen product after the component content is fed back by the first online chromatograph 30 on the pure nitrogen conveying pipe 13.
When the molecular sieve adsorption tank 11 in the working state is operated for a preset time or the first online chromatograph 30 on the pure nitrogen delivery pipe 13 is lowered to a preset range, the state switching between the molecular sieve adsorption tank 11 in the standby state and the molecular sieve adsorption tank 11 in the working state is needed, the molecular sieve adsorption tank 11 in the standby state is in the working state after the switching, and the molecular sieve adsorption tank 11 in the working state is in the state to be analyzed.
The molecular sieve adsorption tank 11 in the state to be analyzed needs to desorb impurity gas, and the specific steps are as follows: firstly, the first regulating valve 16 is opened, part of high-temperature nitrogen stored in the high-pressure buffer tank 6 is used as desorption gas, and sequentially passes through the first high-temperature nitrogen conveying pipe 15, the first conveying pipe 14 corresponding to the molecular sieve adsorption tank 11 in a state to be resolved and the molecular sieve adsorption tank 11 in the state to be resolved, and finally is continuously discharged outwards through the first desorption gas discharge pipe 21, the component content is continuously fed back through the first online chromatograph 30 arranged on the first desorption gas discharge pipe 21 during the period, and when the value fed back by the first online chromatograph 30 arranged on the first desorption gas discharge pipe 21 reaches a preset range, the first regulating valve 16 can be closed to stop the desorption process and reduce the temperature; at this time, the molecular sieve adsorption tank 11 in the state to be analyzed is reconverted to the molecular sieve adsorption tank 11 in the standby state.
By the embodiment 1, the part of the high-temperature nitrogen stored in the high-pressure buffer tank 6 to be deoxygenated by the carbon powder layer 10 in the carbon powder storage tank 7 is used as desorption gas for adsorbing impurity gas by the molecular sieve layer 12 in the analysis molecular sieve adsorption tank 11, so that the product configuration that the single path of heating gas is originally required to be singly used as desorption gas for the molecular sieve layer 12 in the molecular sieve adsorption tank 11 is replaced; thereby simplifying the complexity of the overall device.
Example 2: the cryogenic air separation nitrogen production method is that air is used as raw material, and through compression, purification and heat exchange, air is liquefied into liquid air. The liquid air is mainly a mixture of liquid oxygen and liquid nitrogen, and nitrogen is obtained by separating liquid air through rectification of the liquid air by utilizing the difference of boiling points of the liquid oxygen and the liquid nitrogen. Cryogenic air separation nitrogen production is commonly used in nitrogen production processes of large-scale air separation plants, and the cryogenic nitrogen production process requires process continuity, i.e., a long start-stop period and continuous operation once nitrogen is produced to meet process requirements. For the target demand customers of pure nitrogen demand, some of the customers are electronic manufacturing enterprises, the application purpose of pure nitrogen is to provide high-purity shielding gas to isolate oxygen, and the partial enterprises have less nitrogen consumption compared with large chemical enterprises, and the continuous working requirements of the enterprises are not high but the quality requirements of the nitrogen are higher.
Therefore, for this kind of target customer, this embodiment further includes, on the basis of embodiment 1, as shown in fig. 2, a compressed air delivery pipe 31, the compressed air delivery pipe 31 is sequentially provided with a second filter 32, an air compressor unit 33, a third regulating valve 34, a freeze dryer 36 and a third filter 37 along the direction from the inlet end of the compressed air delivery pipe 31 to the outlet end of the compressed air delivery pipe 31, the outlet end of the compressed air delivery pipe 31 is communicated with at least two second adsorption devices, the second adsorption devices include a carbon molecular sieve adsorption tank 38 and carbon molecular sieve layers 39 respectively disposed in each carbon molecular sieve adsorption tank 38, each carbon molecular sieve adsorption tank 38 is communicated with the compressed air delivery pipe 31 through a fifth delivery pipe 40, a second industrial nitrogen delivery pipe 41 is disposed on the low-pressure buffer tank 2, a second check valve 42 is disposed on the second industrial nitrogen delivery pipe 41, the end, away from the fifth conveying pipe 40, of each carbon molecular sieve adsorption tank 38 is communicated with the second industrial nitrogen conveying pipe 41 through a sixth conveying pipe 43, a third high-temperature nitrogen conveying pipe 44 is arranged on the high-pressure buffer tank 6, a fourth regulating valve 45 is arranged on the third high-temperature nitrogen conveying pipe 44, the end, away from the fifth conveying pipe 40, of each carbon molecular sieve adsorption tank 38 is communicated with the third high-temperature nitrogen conveying pipe 44 through a seventh conveying pipe 46, an eighth conveying pipe 47 is arranged at the end, close to the fifth conveying pipe 40, of each carbon molecular sieve adsorption tank 38, a second desorption gas discharge pipe 48 is communicated with the eighth conveying pipes 47, and a second online chromatograph 49 is arranged on the second industrial nitrogen conveying pipe 41 and the second desorption gas discharge pipe 48 between the second one-way valve 42 and the sixth conveying pipe 43. The first, second, third, fourth, fifth, sixth, seventh, and eighth transfer pipes 14, 18, 19, 20, 40, 43, 46, and 47 are each provided with a second shut-off valve 50.
Meanwhile, in order to reduce the work load of the freeze dryer 36, the product is provided with a heat source channel of the second heat exchanger 35 on the compressed air conveying pipe 31 between the third regulating valve 34 and the freeze dryer 36. The compressed air after being pressurized by the air compressor unit 33 firstly enters the heat source channel of the second heat exchanger 35 and the continuously conveyed cold source in the cold source channel of the second heat exchanger 35 for heat exchange, so that the temperature of the air entering the freeze dryer 36 is reduced, and the technical aim of reducing the work load of the freeze dryer 36 is fulfilled.
Further to facilitate the supply of industrial nitrogen as purge gas, the present product is provided with a fifth regulator valve 51 on the second industrial nitrogen feed line 41 between a second on-line chromatograph 49 mounted on the second industrial nitrogen feed line 41 and the second one-way valve 42. A third industrial nitrogen delivery pipe 52 is provided on the second industrial nitrogen delivery pipe 41 between the fifth regulating valve 51 and the second check valve 42, and a sixth regulating valve 53 is provided on the third industrial nitrogen delivery pipe 52. Industrial nitrogen is supplied as a purge gas to the outside through the third industrial nitrogen supply pipe 52 for use.
The application method of the product is as follows: as shown in fig. 2, on the basis of example 1, the product can continuously deliver industrial nitrogen to the low-pressure buffer tank 2, and the specific flow is as follows: firstly, the external atmosphere is filtered by a second filter 32 and then pressurized by an air compressor unit 33 to form compressed air; then, the compressed air is sequentially sent into the heat source channel of the second heat exchanger 35 and the cold source medium continuously sent into the cold source channel of the second heat exchanger 35 to form heat exchange, and after the compressed air is sent out of the heat source channel of the second heat exchanger 35, the heat generated by the pressurization of the air compressor unit 33 is partially absorbed and the temperature is reduced; then, the water vapor carried in the compressed air sent into the freeze dryer 36 is solidified to form particles and filtered by a third filter 37 at the downstream of the freeze dryer 36 to remove the particles to form water-removed compressed air; then, the dehydrated compressed air is sent into a carbon molecular sieve layer 39 in a carbon molecular sieve adsorption tank 38 under the working state to carry out nitrogen-oxygen separation, the nitrogen content of the dehydrated compressed air continuously rises in the process of passing through the carbon molecular sieve layer 39, and a small amount of impurity gas carried by the dehydrated compressed air in the process of passing through the carbon molecular sieve layer 39 is adsorbed by the carbon molecular sieve layer 39; finally, the low pressure buffer tank 2 was continuously supplied with gas through the second industrial nitrogen gas feed pipe 41, during which continuous component content analysis was performed through the second on-line chromatograph 49 installed on the second industrial nitrogen gas feed pipe 41. When it is necessary to separately supply industrial nitrogen for the product gas to be delivered to the outside, it is necessary to open the sixth regulating valve 53 and then deliver the product gas to the outside through the third industrial nitrogen delivery pipe 52.
When the carbon molecular sieve adsorption tank 38 in the operating state is operated for a preset time or the second on-line chromatograph 49 installed on the second industrial nitrogen gas delivery pipe 41 is lowered to a preset range, the carbon molecular sieve adsorption tank 38 in the operating state needs to be converted into the carbon molecular sieve adsorption tank 38 in the state to be analyzed, and the carbon molecular sieve adsorption tank 38 in the standby state needs to be converted into the carbon molecular sieve adsorption tank 38 in the operating state.
The carbon molecular sieve adsorption tank 38 in the state to be resolved needs to desorb the impurity gas adsorbed therein, and the specific flow is as follows:
firstly, a fourth regulating valve 45 is opened, part of high-temperature nitrogen stored in the high-pressure buffer tank 6 is used as desorption gas, and sequentially passes through a third high-temperature nitrogen conveying pipe 44, a seventh conveying pipe 46 corresponding to the carbon molecular sieve adsorption tank 38 in a state to be analyzed and the carbon molecular sieve adsorption tank 38 in the state to be analyzed, and finally is continuously discharged outwards through a second desorption gas discharge pipe 48, the content of components is continuously fed back through a second online chromatograph 49 arranged on the second desorption gas discharge pipe 48 during the period, and when the value fed back by the second online chromatograph 49 arranged on the second desorption gas discharge pipe 48 reaches a preset range, the first regulating valve 16 can be closed to stop the desorption process and reduce the temperature; at this time, the carbon molecular sieve adsorption tank 38 in the state to be analyzed is reconverted to the carbon molecular sieve adsorption tank 38 in the standby state.
By comparing example 2 with example 1, example 2 provides an industrial nitrogen manufacturing apparatus, the carbon molecular sieve layer 39 is used as a core component of nitrogen-oxygen separation to realize a normal temperature and low pressure nitrogen manufacturing process in the form of pressure swing adsorption, compared with a cryogenic air separation nitrogen manufacturing large-scale process, the production stopping of the process is more convenient by using the normal temperature and low pressure nitrogen manufacturing process in the form of pressure swing adsorption, and the embodiment also uses part of high temperature nitrogen to be deoxidized by the carbon powder layer 10 in the carbon powder storage tank 7 in the high pressure buffer tank 6 as desorption gas for analyzing the carbon molecular sieve layer 39 in the carbon molecular sieve adsorption tank 38 to adsorb impurity gas, so as to replace the product configuration that the carbon molecular sieve layer 39 in the carbon molecular sieve adsorption tank 38 originally needs to be singly heated by one path as desorption gas; thereby simplifying the complexity of the overall device.
The utility model is a purifying device for preparing pure nitrogen by utilizing industrial nitrogen, which meets the requirements of workers in the field of purifying equipment for preparing pure nitrogen by industrial nitrogen, so that the purifying device has wide market prospect.
Claims (6)
1. A purification device for preparing pure nitrogen by utilizing industrial nitrogen is characterized in that: the device comprises a first industrial nitrogen conveying pipe (1), the first industrial nitrogen conveying pipe (1) is sequentially provided with a low-pressure buffer tank (2), a nitrogen compressor (3), a first one-way valve (4), an electric heater (5) and a high-pressure buffer tank (6) along the direction from the inlet end of the first industrial nitrogen conveying pipe (1) to the outlet end of the first industrial nitrogen conveying pipe (1), the high-pressure buffer tank (6) is sequentially communicated with a carbon powder storage tank (7), a temperature-changing gas conveying pipe (8) and a first adsorption device, the temperature-changing gas conveying pipe (8) is provided with a first heat exchanger (9), a carbon powder layer (10) is arranged in the carbon powder storage tank (7), the first adsorption device comprises at least two molecular sieve adsorption tanks (11), a molecular sieve layer (12) and a plurality of pure nitrogen conveying pipes (13) which are communicated with the molecular sieve adsorption tanks (11), each molecular sieve adsorption tank (11) is respectively provided with a first conveying pipe (14), the first conveying pipe (14) and the high-temperature-changing pipe (15) are uniformly communicated with the high-pressure buffer tank (6) through a first nitrogen regulating valve (15), the low-pressure buffer tank (2) and the high-pressure buffer tank (6) are respectively provided with a first temperature sensor (17).
2. The purification apparatus for producing pure nitrogen by using industrial nitrogen as claimed in claim 1, wherein: one end of each molecular sieve adsorption tank (11) close to the first conveying pipe (14) is communicated with the pure nitrogen conveying pipe (13) through a second conveying pipe (18) respectively; one end of each molecular sieve adsorption tank (11) far away from the first conveying pipe (14) is respectively communicated with the variable-temperature gas conveying pipe (8) through a third conveying pipe (19), one end of each molecular sieve adsorption tank (11) far away from the first conveying pipe (14) is respectively provided with a fourth conveying pipe (20), and a plurality of fourth conveying pipes (20) are respectively communicated with the first desorption gas discharge pipe (21).
3. The purification apparatus for producing pure nitrogen by using industrial nitrogen as claimed in claim 1, wherein: the low-pressure buffer tank (2) and the high-pressure buffer tank (6) are respectively provided with a safety valve (22) and a pressure sensor (23).
4. The purification apparatus for producing pure nitrogen by using industrial nitrogen as claimed in claim 1, wherein: the temperature-variable gas conveying pipe (8) between the first adsorption device and the first heat exchanger (9) is provided with a second temperature sensor (24), and the temperature-variable gas conveying pipe (8) between the carbon powder storage tank (7) and the first heat exchanger (9) is provided with a first filter (25).
5. The purification apparatus for producing pure nitrogen by using industrial nitrogen as claimed in claim 1, wherein: the carbon powder storage tank (7) is provided with an oxygen removal pipe (26), and the oxygen removal pipes (26) on two sides of the carbon powder storage tank (7) are respectively provided with a first stop valve (27); the number of the carbon powder storage tanks (7) is a plurality, and the carbon powder storage tanks (7) are mutually connected in parallel; each carbon powder storage tank (7) is communicated with the high-pressure buffer tank (6) through a second high-temperature nitrogen conveying pipe (28), and a second regulating valve (29) is arranged on the second high-temperature nitrogen conveying pipe (28).
6. The purification apparatus for producing pure nitrogen by using industrial nitrogen as claimed in claim 2, wherein: the first desorption gas discharge pipe (21) and the pure nitrogen delivery pipe (13) are respectively provided with a first online chromatograph (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321014469.1U CN219804413U (en) | 2023-04-28 | 2023-04-28 | Purification device for preparing pure nitrogen by utilizing industrial nitrogen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321014469.1U CN219804413U (en) | 2023-04-28 | 2023-04-28 | Purification device for preparing pure nitrogen by utilizing industrial nitrogen |
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