CN117983021A - Low-energy-consumption two-tower VPSA nitrogen production system and process thereof - Google Patents
Low-energy-consumption two-tower VPSA nitrogen production system and process thereof Download PDFInfo
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- CN117983021A CN117983021A CN202410165103.7A CN202410165103A CN117983021A CN 117983021 A CN117983021 A CN 117983021A CN 202410165103 A CN202410165103 A CN 202410165103A CN 117983021 A CN117983021 A CN 117983021A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 67
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 64
- 230000008569 process Effects 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000005265 energy consumption Methods 0.000 title claims abstract description 19
- 238000001179 sorption measurement Methods 0.000 claims abstract description 212
- 238000003795 desorption Methods 0.000 claims abstract description 48
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 6
- 239000002808 molecular sieve Substances 0.000 claims description 21
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 238000004887 air purification Methods 0.000 claims description 3
- 230000001172 regenerating effect Effects 0.000 claims description 3
- 230000008929 regeneration Effects 0.000 claims description 3
- 238000011069 regeneration method Methods 0.000 claims description 3
- 230000003993 interaction Effects 0.000 abstract description 6
- 230000006872 improvement Effects 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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- Separation Of Gases By Adsorption (AREA)
Abstract
The invention discloses a low-energy-consumption two-tower VPSA nitrogen production system and a process thereof, wherein the system comprises a group of adsorption towers; the adsorption tower group mainly comprises two adsorption towers A and B which are connected in parallel, wherein the adsorption towers A and B at the air inlet end are communicated with an air tank together, and the adsorption towers A and B at the air outlet end are respectively communicated with a vacuum pump and a buffer tank together; when any one adsorption tower A/B is controlled to carry out low-pressure adsorption, the other adsorption tower B/A is rapidly subjected to vacuum desorption by a vacuum pump, so that the cyclic adsorption process is completed, and the continuous output of nitrogen products is realized; the invention can realize the interaction of adsorption and desorption processes of the adsorption tower group of the nitrogen production system, namely, when the deoxidization and nitrogen enrichment process is carried out, one adsorption tower can carry out adsorption, the other adsorption tower can simultaneously realize desorption, the low-pressure adsorption process and the vacuum desorption process are simultaneously carried out, and the operation is synchronously switched according to the time sequence control; compared with the conventional PSA nitrogen production system, the method can save 15-20% of operation energy consumption.
Description
Technical Field
The invention relates to the technical field of industrial nitrogen production, in particular to a low-energy-consumption two-tower VPSA nitrogen production system and a process thereof.
Background
At present, common deoxidizing and nitrogen-enriching processes using air as a raw material mainly comprise a PSA process and a VPSA process. The PSA and VPSA processes are all carried out by taking air as raw material, and separating gas mixture by utilizing the difference of adsorption performance of molecular sieve on different gas molecules, thereby achieving the aim of deoxidizing and enriching nitrogen. The conventional PSA nitrogen production process adopts a mode of pressurized adsorption and normal pressure desorption, the operating pressure level of the system is higher and reaches 0.7-1.0MPa, on one hand, the compression system needs more operating energy consumption, on the other hand, the system equipment structure is more complex, and the problems of safety management of a pressure container and the like exist. The VPSA technology adopts the modes of low-pressure adsorption and vacuum desorption, the system operation pressure can be reduced to 0.04-0.10MPa, the energy consumption for compressing the system operation can be obviously reduced, the constitution of system equipment is reduced, and the safety problem of a pressure vessel is avoided.
The prior patent document CN114849424A (a large-scale VPSA nitrogen-oxygen co-production device with multiple towers) discloses a technical scheme of adopting three nitrogen adsorption towers and three oxygen adsorption towers, and when the incoming gas flow is large, a plurality of adsorption towers operate simultaneously, so that the nitrogen production efficiency is high. However, when the flow rate of the incoming gas is small, the utilization rate of equipment is low, the return rate of investment of the nitrogen production system is low, and the required maintenance cost is high.
Disclosure of Invention
The invention aims to provide a low-energy-consumption two-tower VPSA nitrogen production system and a process thereof, which can realize the interaction of adsorption and desorption processes of an adsorption tower group of the nitrogen production system, namely, one adsorption tower can carry out adsorption while carrying out a deoxidization and nitrogen enrichment process, the other adsorption tower can simultaneously realize desorption, the low-pressure adsorption process and the vacuum desorption process are carried out simultaneously, and the synchronous switching operation is controlled according to time sequence; compared with the conventional PSA nitrogen production system, the method can save 15-20% of operation energy consumption.
The invention is realized by the following technical scheme:
A low-energy-consumption two-tower VPSA nitrogen production system comprises a group of adsorption towers; the adsorption tower group mainly comprises two adsorption towers A and B which are connected in parallel, wherein the adsorption towers A and B at the air inlet end are communicated with an air tank together, and the adsorption towers A and B at the air outlet end are respectively communicated with a vacuum pump and a buffer tank together; when any one of the adsorption towers A/B is controlled to carry out low-pressure adsorption, the other adsorption tower B/A is rapidly subjected to vacuum desorption by a vacuum pump, so that the cyclic adsorption process is completed, and the continuous output of nitrogen products is realized.
Further as an improvement of the technical scheme of the invention, the air tank is connected with a low-pressure air compressor; the low-pressure adsorption is carried out by providing low-pressure air within the range of 0.04-0.10 MPa by a low-pressure air compressor, allowing the low-pressure air to enter any adsorption tower for adsorption after passing through an air tank, and outputting the product nitrogen after adsorption outwards through a buffer tank.
Further as an improvement of the technical scheme of the invention, the vacuum desorption pump pumps the medium in the other adsorption tower, reduces the pressure in the adsorption tower to the range of-0.04 to-0.10 MPa, and realizes complete desorption and discharge of the adsorbed substances.
Further as an improvement of the technical scheme of the invention, the adsorption tower A, the adsorption tower B, the air tank, the vacuum pump and the buffer tank are communicated through pipelines and valves (two, four, five, seven, eight, eleven and twelve).
Further as an improvement of the technical scheme of the invention, when the adsorption tower A is used for adsorption, the valve (two and four) is opened, the valve (five and seven) is closed, and the low-pressure air provided by the low-pressure air compressor enters the air tank and then enters the adsorption tower A for adsorption through the valve (two and four); meanwhile, the adsorption tower B is desorbed, the valve (twelve) is opened, the valve (eleven) is closed, when the adsorption material in the adsorption tower B is pumped by the vacuum pump to realize desorption of the adsorption tower A for adsorption, the valve (two, four) is opened, the valve (five, seven) is closed, and the low-pressure air provided by the low-pressure air compressor enters the air tank and then enters the adsorption tower A for adsorption through the valve (two, four); at the same time, the adsorption tower B is desorbed, the valve (twelve) is opened, the valve (eleven) is closed, and the adsorption substances in the adsorption tower B are pumped by a vacuum pump to realize desorption.
Further as an improvement of the technical scheme of the invention, the valves (two, four, five, seven, eight, eleven and twelve) are all electromagnetic valves, and are controlled and switched according to the process time sequence by a PLC.
Further as an improvement of the technical scheme of the invention, the vacuum desorption process is adopted, the pressure of the adsorption tower is controlled within the range of-0.04 to-0.10 MPa to realize complete desorption, and the circulating adsorption kinetic energy can reach the same level when the normal pressure desorption is carried out for 0.4MPa under the pressure level.
Further as the improvement of the technical scheme of the invention, a low-energy-consumption two-tower VPSA nitrogen production process comprises the following steps:
step S1, raw material air is pretreated through an air purification unit, is compressed to be 0.4MPa-0.5MPa of rated standard by a low-pressure oil-free piston air compressor, enters a nitrogen making system to provide continuous and stable air flow and pressure for the nitrogen making system, and provides safe air source supply for a following nitrogen making host;
S2, the adsorption towers A and B are internally provided with special carbon molecular sieves, the control system controls the opening of an automatic valve, and when clean compressed air enters the inlet end of the adsorption tower A and flows to the outlet end through the carbon molecular sieves, the adsorption capacity of oxygen on the molecular sieves is higher than that of nitrogen, so that the oxygen is preferentially adsorbed; o 2、CO2 and H 2 O are adsorbed, and the product nitrogen flows out from the outlet end of the adsorption tower;
S3, automatically stopping adsorption when the carbon molecular sieve in the adsorption tower A reaches an adsorption saturation state, enabling compressed air to flow into the adsorption tower B for oxygen adsorption to obtain nitrogen, and regenerating the molecular sieve in the adsorption tower A; during regeneration, the vacuum pump is used for vacuumizing the adsorption tower to form vacuum degree, negative pressure desorption is carried out, and the molecular sieve in the tower recovers the re-adsorption capacity.
Compared with the prior art, the invention has the following technical advantages:
1. The process can realize the interaction of the adsorption and desorption processes of each adsorption tower in the adsorption tower group, ensure the stable and continuous operation of the adsorption and desorption processes, and output stable nitrogen gas flow products.
2. The vacuum pump provided by the process of the invention can provide adsorption kinetic energy equivalent to that of 0.4MPa of atmospheric desorption during vacuum desorption, and can save 15-20% of energy compared with the PSA process.
3. Compared with PSA, the process of the invention can realize peak adsorption recovery rate at lower pressure, the pressure level of the whole process is lower, the impact of airflow on a bed layer can be reduced, and the service life of equipment is longer.
4. The process and the system have low overall operation pressure, do not meet the requirement of the pressure vessel management level, and have more convenient production management and higher safety.
5. Under the working pressure of the system, the adsorption effect of the system on oxygen, water vapor, carbon dioxide and the like in the air can reach a peak value, and the air consumption is minimum.
6. The process and the system have no pollution risk in the whole operation process, the service life of equipment is longer, and the pollution risk of the produced products is small.
7. The valve has simple process and system equipment, can be suitable for skid-mounted production, and is beneficial to use, management and maintenance of small and medium-sized nitrogen demand customers.
Drawings
FIG. 1 is a schematic diagram of a low energy two-tower VPSA nitrogen production system according to an embodiment of the present invention;
FIG. 2 is a process flow diagram of a low energy consumption two tower VPSA nitrogen production process according to an embodiment of the invention.
The reference numerals in the figures are:
1-an air tank; 2. 4,5, 7,8, 11, 12-valves; 3-an adsorption tower A; 6-an adsorption tower B; 9-a buffer tank; 10-a temperature sensor; 13-vacuum pump.
Detailed Description
The present invention will now be described in detail with reference to the drawings and the specific embodiments thereof, which are illustrative embodiments and illustrations of the invention, but are not to be construed as limiting the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, back, upper, lower, top, bottom … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular gesture (as shown in the drawings), and if the particular gesture changes, the directional indicators correspondingly change.
In the present invention, unless explicitly specified and limited otherwise, the term "connected" is to be construed broadly, and for example, "connected" may be either fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first", "a second" may include at least one such feature, either explicitly or implicitly; in addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
A low-energy-consumption two-tower VPSA nitrogen production system comprises a group of adsorption towers; the adsorption tower group mainly comprises two adsorption towers A and B which are connected in parallel, wherein the adsorption towers A and B at the air inlet end are communicated with an air tank together, and the adsorption towers A and B at the air outlet end are respectively communicated with a vacuum pump and a buffer tank together; when any one of the adsorption towers A/B is controlled to carry out low-pressure adsorption, the other adsorption tower B/A is rapidly subjected to vacuum desorption by a vacuum pump, so that the cyclic adsorption process is completed, and the continuous output of nitrogen products is realized.
Specifically, in this embodiment, the air tank is connected to a low-pressure air compressor; the low-pressure adsorption is carried out by providing low-pressure air within the range of 0.04-0.10 MPa by a low-pressure air compressor, allowing the low-pressure air to enter any adsorption tower for adsorption after passing through an air tank, and outputting the product nitrogen after adsorption outwards through a buffer tank.
Specifically, in the scheme of the embodiment, the medium in the other adsorption tower is pumped by a vacuum pump to reduce the pressure in the adsorption tower to the range of-0.04 to-0.10 MPa, so that the adsorption material is completely desorbed and discharged.
Specifically, in this embodiment, the adsorption tower a, the adsorption tower B, the air tank, the vacuum pump and the buffer tank are communicated through pipes and valves (two, four, five, seven, eight, eleven and twelve).
Specifically, in this embodiment, when the adsorption tower a performs adsorption, the valve (two, four) is opened, the valve (five, seven) is closed, and the low-pressure air provided by the low-pressure air compressor enters the air tank and then enters the adsorption tower a through the valve (two, four) for adsorption; meanwhile, the adsorption tower B is desorbed, the valve (twelve) is opened, the valve (eleven) is closed, when the adsorption material in the adsorption tower B is pumped by the vacuum pump to realize desorption of the adsorption tower A for adsorption, the valve (two, four) is opened, the valve (five, seven) is closed, and the low-pressure air provided by the low-pressure air compressor enters the air tank and then enters the adsorption tower A for adsorption through the valve (two, four); at the same time, the adsorption tower B is desorbed, the valve (twelve) is opened, the valve (eleven) is closed, and the adsorption substances in the adsorption tower B are pumped by a vacuum pump to realize desorption.
Specifically, in this embodiment, the valves (two, four, five, seven, eight, eleven, twelve) are all solenoid valves, and are controlled and switched by a PLC according to a process sequence.
Specifically, in the scheme of the embodiment, the vacuum desorption process is performed, the pressure of the adsorption tower is controlled within the range of-0.04 to-0.10 MPa to realize complete desorption, and the kinetic energy of the realized cyclic adsorption can reach the same level when the atmospheric pressure is used for desorbing 0.4MPa under the pressure level.
Specifically, in the scheme of the embodiment, the two-tower VPSA nitrogen production process with low energy consumption comprises the following steps:
step S1, raw material air is pretreated through an air purification unit, is compressed to be 0.4MPa-0.5MPa of rated standard by a low-pressure oil-free piston air compressor, enters a nitrogen making system to provide continuous and stable air flow and pressure for the nitrogen making system, and provides safe air source supply for a following nitrogen making host;
S2, the adsorption towers A and B are internally provided with special carbon molecular sieves, the control system controls the opening of an automatic valve, and when clean compressed air enters the inlet end of the adsorption tower A and flows to the outlet end through the carbon molecular sieves, the adsorption capacity of oxygen on the molecular sieves is higher than that of nitrogen, so that the oxygen is preferentially adsorbed; o 2、CO2 and H 2 O are adsorbed, and the product nitrogen flows out from the outlet end of the adsorption tower;
S3, automatically stopping adsorption when the carbon molecular sieve in the adsorption tower A reaches an adsorption saturation state, enabling compressed air to flow into the adsorption tower B for oxygen adsorption to obtain nitrogen, and regenerating the molecular sieve in the adsorption tower A; during regeneration, the vacuum pump is used for vacuumizing the adsorption tower to form vacuum degree, negative pressure desorption is carried out, and the molecular sieve in the tower recovers the re-adsorption capacity.
Embodiment one:
Referring to fig. 1 and 2, the embodiment provides a low-energy-consumption two-tower VPSA nitrogen production system and a process thereof, wherein the system comprises a group of parallel adsorption towers, and each adsorption tower group consists of two independent adsorption towers with special carbon molecular sieves connected in parallel. When any adsorption tower is controlled to adsorb, the process enables the other adsorption tower to complete the cyclic adsorption process of vacuum desorption, and the nitrogen product obtained after the adsorption tower completes the adsorption is output through the buffer tank.
The embodiment adopts a group of adsorption tower groups, comprising an adsorption tower A3 and an adsorption tower B6 which are arranged in parallel, and the adsorption tower groups are provided with a low-pressure air compressor and a vacuum pump 13. Air is compressed to rated pressure by an air compressor, and stable air flow and pressure are provided for a nitrogen production system; the vacuum pump 13 vacuumizes the inside of the adsorption tower to form a certain vacuum degree, so that negative pressure desorption is realized, and the molecular sieve in the tower has re-adsorption capacity. The connecting pipelines of the air tank 1, the adsorption tower A3 and the adsorption tower B6 are sequentially provided with valves (2 and 5), the connecting pipelines of the adsorption tower A3, the adsorption tower B6 and the buffer tank are sequentially provided with valves (4, 7 and 8), and the connecting pipelines of the adsorption tower A3, the adsorption tower B6 and the vacuum pump 13 are sequentially provided with valves (11 and 12), so that the process structure is shown in figure 1.
The embodiment can realize the adsorption and desorption interaction of any adsorption tower in the adsorption tower group. The specific implementation is as follows:
adsorption process: the low-pressure air provided by the low-pressure air compressor enters the air tank 1, the valve (2) is opened, the valves (5 and 7) are closed, the low-pressure air enters the adsorption tower A3 for adsorption, the valves (4 and 8) are opened, and the nitrogen gas of the adsorbed product enters the buffer tank 9 and is output outwards. The buffer tank 9 is connected with a temperature sensor 10.
And (3) a desorption process: the vacuum pump 13 is turned on, the valve 12 is turned on, the valve 11 is closed, the pressure in the adsorption tower B6 is gradually reduced, the adsorbed substances in the adsorption bed are gradually desorbed until being completely desorbed, and the adsorbed substances are discharged outwards through the vacuum pump 13.
The adsorption process and the desorption process are performed simultaneously.
When adsorption and desorption time sequences are switched, valves (2, 4) are closed, valves (5, 7) are opened, low-pressure air enters an adsorption tower B6 for adsorption, and the nitrogen of the adsorbed product enters a buffer tank 9 and is output outwards; closing the valve 12, opening the valve 11, and pumping the medium in the adsorption tower A3 by the vacuum pump 13 until the adsorption tower A3 finishes desorption, wherein the adsorption tower finishes one adsorption and one desorption process is a one-time circulation process.
Compared with the prior art, the invention provides a low-energy-consumption two-tower VPSA nitrogen production system and a process thereof, wherein the process is mainly divided into low-pressure adsorption and vacuum desorption, and the system comprises a low-pressure air compressor, an air tank, two adsorption towers which are in parallel operation, a vacuum pump, a buffer tank, a connecting pipeline and a control valve; the low-pressure adsorption process and the vacuum desorption process are performed simultaneously, and the synchronous switching operation is controlled according to the time sequence; compared with the conventional PSA nitrogen production system, the method can save 15-20% of operation energy consumption; the invention has the following beneficial effects:
1. The process can realize the interaction of the adsorption and desorption processes of each adsorption tower in the adsorption tower group, ensure the stable and continuous operation of the adsorption and desorption processes, and output stable nitrogen gas flow products.
2. The vacuum pump provided by the process of the invention can provide adsorption kinetic energy equivalent to that of 0.4MPa of atmospheric desorption during vacuum desorption, and can save 15-20% of energy compared with the PSA process.
3. Compared with PSA, the process of the invention can realize peak adsorption recovery rate at lower pressure, the pressure level of the whole process is lower, the impact of airflow on a bed layer can be reduced, and the service life of equipment is longer.
4. The process and the system have low overall operation pressure, do not meet the requirement of the pressure vessel management level, and have more convenient production management and higher safety.
5. Under the working pressure of the system, the adsorption effect of the system on oxygen, water vapor, carbon dioxide and the like in the air can reach a peak value, and the air consumption is minimum.
6. The process and the system have no pollution risk in the whole operation process, the service life of equipment is longer, and the pollution risk of the produced products is small.
7. The valve has simple process and system equipment, can be suitable for skid-mounted production, and is beneficial to use, management and maintenance of small and medium-sized nitrogen demand customers.
The foregoing has described in detail the technical solutions provided by the embodiments of the present invention, and specific examples have been applied to illustrate the principles and implementations of the embodiments of the present invention, where the above description of the embodiments is only suitable for helping to understand the principles of the embodiments of the present invention; meanwhile, as for those skilled in the art, according to the embodiments of the present invention, there are variations in the specific embodiments and the application scope, and the present description should not be construed as limiting the present invention.
Claims (8)
1. A low-energy consumption two-tower VPSA nitrogen production system is characterized in that: comprises a group of adsorption towers; the adsorption tower group mainly comprises two adsorption towers A (3) and B (6) which are connected in parallel, wherein the adsorption towers A (3) and B (6) are communicated with an air tank (1) at the air inlet end, and the adsorption towers A (3) and B (6) are respectively communicated with a vacuum pump (13) and a buffer tank (9) at the air outlet end; when any adsorption tower A (3)/B (6) is controlled to carry out low-pressure adsorption, the other adsorption tower B (6)/A (3) is rapidly subjected to vacuum desorption through a vacuum pump (13), so that the cyclic adsorption process is completed, and continuous output of nitrogen products is realized.
2. A low energy two column VPSA nitrogen generation system according to claim 1 wherein: the air tank (1) is connected with a low-pressure air compressor; the low-pressure adsorption is carried out by providing low-pressure air in the range of 0.04-0.10 MPa by a low-pressure air compressor, leading the low-pressure air to enter any adsorption tower for adsorption after passing through an air tank (1), and outputting the product nitrogen after the adsorption outwards through a buffer tank (9).
3. A low energy two column VPSA nitrogen generation system according to claim 2 wherein: the medium in the other adsorption tower is pumped by a vacuum pump (13) for vacuum desorption, the pressure in the adsorption tower is reduced to the range of-0.04 to-0.10 MPa, and the adsorption material is completely desorbed and discharged.
4. A low energy two column VPSA nitrogen generation system according to claim 1 wherein: the adsorption tower A (3), the adsorption tower B (6), the air tank (1), the vacuum pump (13) and the buffer tank (9) are communicated through pipelines and valves (2, 4, 5, 7, 8, 11 and 12).
5. The low energy two column VPSA nitrogen generation system of claim 4 wherein: when the adsorption tower A (3) is used for adsorption, the valves (2 and 4) are opened, the valves (5 and 7) are closed, and low-pressure air provided by the low-pressure air compressor enters the air tank (1) and then enters the adsorption tower A (3) for adsorption through the valves (2 and 4); at the same time, the adsorption tower B (6) is desorbed, the valve (12) is opened, the valve (11) is closed, and the adsorption material in the adsorption tower B (6) is pumped by the vacuum pump (13) to realize desorption.
6. The low energy two column VPSA nitrogen generation system of claim 4 wherein: the valves (2, 4, 5, 7, 8, 11 and 12) are all electromagnetic valves, and are controlled and switched according to the process time sequence through a PLC.
7. A low energy two column VPSA nitrogen generation system according to claim 1 wherein: and in the vacuum desorption process, the pressure of the adsorption tower is controlled within the range of-0.04 to-0.10 MPa to realize complete desorption, and the circulating adsorption kinetic energy can reach the same level when the atmospheric pressure is used for desorbing 0.4MPa under the pressure level.
8. A low-energy-consumption two-tower VPSA nitrogen production process is characterized by comprising the following steps of:
step S1, raw material air is pretreated through an air purification unit, is compressed to be 0.4MPa-0.5MPa of rated standard by a low-pressure oil-free piston air compressor, enters a nitrogen making system to provide continuous and stable air flow and pressure for the nitrogen making system, and provides safe air source supply for a following nitrogen making host;
S2, the adsorption towers A and B are internally provided with special carbon molecular sieves, the control system controls the opening of an automatic valve, and when clean compressed air enters the inlet end of the adsorption tower A and flows to the outlet end through the carbon molecular sieves, the adsorption capacity of oxygen on the molecular sieves is higher than that of nitrogen, so that the oxygen is preferentially adsorbed; o 2、CO2 and H 2 O are adsorbed, and the product nitrogen flows out from the outlet end of the adsorption tower;
S3, automatically stopping adsorption when the carbon molecular sieve in the adsorption tower A reaches an adsorption saturation state, enabling compressed air to flow into the adsorption tower B for oxygen adsorption to obtain nitrogen, and regenerating the molecular sieve in the adsorption tower A; during regeneration, the vacuum pump is used for vacuumizing the adsorption tower to form vacuum degree, negative pressure desorption is carried out, and the molecular sieve in the tower recovers the re-adsorption capacity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410165103.7A CN117983021A (en) | 2024-02-05 | 2024-02-05 | Low-energy-consumption two-tower VPSA nitrogen production system and process thereof |
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| CN202410165103.7A CN117983021A (en) | 2024-02-05 | 2024-02-05 | Low-energy-consumption two-tower VPSA nitrogen production system and process thereof |
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