CN110817812A - Small-size high-purity nitrogen generator - Google Patents
Small-size high-purity nitrogen generator Download PDFInfo
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- CN110817812A CN110817812A CN201911192797.9A CN201911192797A CN110817812A CN 110817812 A CN110817812 A CN 110817812A CN 201911192797 A CN201911192797 A CN 201911192797A CN 110817812 A CN110817812 A CN 110817812A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 202
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 101
- 238000001179 sorption measurement Methods 0.000 claims abstract description 85
- 238000000034 method Methods 0.000 claims abstract description 38
- 230000008569 process Effects 0.000 claims abstract description 32
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 238000005516 engineering process Methods 0.000 claims abstract description 7
- 239000002131 composite material Substances 0.000 claims abstract description 6
- 238000006392 deoxygenation reaction Methods 0.000 claims description 42
- 238000010438 heat treatment Methods 0.000 claims description 17
- 239000003054 catalyst Substances 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 15
- 238000000746 purification Methods 0.000 claims description 15
- 239000002808 molecular sieve Substances 0.000 claims description 14
- 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 14
- 239000003595 mist Substances 0.000 claims description 9
- 239000000428 dust Substances 0.000 claims description 6
- 229920005597 polymer membrane Polymers 0.000 claims description 6
- 230000004913 activation Effects 0.000 claims description 5
- 230000008929 regeneration Effects 0.000 claims description 5
- 238000011069 regeneration method Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 4
- 150000001875 compounds Chemical group 0.000 claims description 3
- 239000002274 desiccant Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000007599 discharging Methods 0.000 abstract description 4
- 230000003749 cleanliness Effects 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 17
- 239000012528 membrane Substances 0.000 description 9
- 238000000926 separation method Methods 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000003139 buffering effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000012510 hollow fiber Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- OLBVUFHMDRJKTK-UHFFFAOYSA-N [N].[O] Chemical compound [N].[O] OLBVUFHMDRJKTK-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/04—Purification or separation of nitrogen
- C01B21/0405—Purification or separation processes
- C01B21/0411—Chemical processing only
- C01B21/0422—Chemical processing only by reduction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/04—Purification or separation of nitrogen
- C01B21/0405—Purification or separation processes
- C01B21/0433—Physical processing only
- C01B21/045—Physical processing only by adsorption in solids
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2210/00—Purification or separation of specific gases
- C01B2210/0001—Separation or purification processing
- C01B2210/0009—Physical processing
- C01B2210/0014—Physical processing by adsorption in solids
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2210/00—Purification or separation of specific gases
- C01B2210/0043—Impurity removed
- C01B2210/0045—Oxygen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2210/00—Purification or separation of specific gases
- C01B2210/0043—Impurity removed
- C01B2210/0062—Water
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- Chemical & Material Sciences (AREA)
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention relates to the technical field of nitrogen making equipment, in particular to a small high-purity nitrogen making machine. The nitrogen generator comprises a cabinet body, an air source system, a nitrogen generating system and a purifying system which are integrated in the cabinet body, and further comprises a PLC control system for controlling the whole nitrogen generator to operate. The invention adopts the pressure swing adsorption and carbon reduction composite process to prepare the high-purity nitrogen, and has the following advantages: 1. the equipment has compact structure and reasonable layout, and realizes the miniaturization of high-purity nitrogen production equipment; 2. the equipment has reliable performance and high automation degree, adopts the advanced numerical control technology to automatically monitor, automatically adjust and safely protect the main parameters in the production process, greatly reduces the starting time of the equipment and shortens the nitrogen discharging waiting time; 3. the prepared nitrogen has high purity, low dew point and high cleanliness; 4. the equipment is easy to operate and convenient to maintain.
Description
Technical Field
The invention relates to the technical field of nitrogen making equipment, in particular to a small high-purity nitrogen making machine.
Background
The three methods are technically mature, realize industrialization and have respective advantages.
a. Cryogenic process
The cryogenic process for producing nitrogen is based on the difference of volatility of each component in liquid air, and nitrogen is produced by separating nitrogen from other components through rectification. Since the liquefaction of air is carried out at low temperature, and the temperature range belongs to the cryogenic section, the method is called cryogenic air separation for nitrogen production. The method is suitable for large-scale equipment, and has the advantages of large investment scale, high requirement on technical capacity and higher maintenance cost.
b. Pressure swing adsorption process
The pressure swing adsorption method for separating air to prepare nitrogen utilizes the difference of oxygen and nitrogen in adsorption capacity, adsorption rate, adsorption force and other aspects on a solid adsorbent and the selective adsorption characteristic of the adsorbent amount to the adsorption capacity of oxygen and nitrogen which are different along with the pressure to realize the oxygen-nitrogen separation. The pressure swing adsorption directly prepares high-purity nitrogen, and the consumption is high, and weight is heavy, and the start-up time is long, is suitable for 24h uninterrupted operation's non-portable equipment.
c. Membrane separation process
The principle of membrane separation of nitrogen is as follows: when a mixture of two or more gases passes through a polymeric membrane, the relative permeation rates of the different gases in the membrane differ due to differences in the solubility and diffusion coefficients of the various gases in the membrane. According to the characteristics, various gases can be divided into 'fast gas' and 'slow gas'. When the mixed gas is under the action of pressure difference on two sides of the membrane, the gas with relatively high permeation rate, such as water, oxygen, etc., rapidly permeates through the hollow fiber membrane wall and is discharged, and the gas with relatively low permeation rate, such as nitrogen, argon, etc., is retained in the hollow fiber and is enriched, so that nitrogen with relatively high purity is obtained. The membrane separation method is suitable for nitrogen making equipment with purity of less than 99.9 percent, and when the membrane separation method is used for preparing high-purity nitrogen, the control difficulty of pressure and temperature is high, and the gas consumption is high.
The existing high-purity nitrogen production equipment is large in size, inconvenient to transfer in the using process, long in starting time and long in nitrogen discharging waiting time.
Disclosure of Invention
The invention aims to provide a small-sized high-purity nitrogen making machine, and solves the technical problems.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a small-sized high-purity nitrogen making machine comprises a cabinet body, an air source system, a nitrogen making system and a purification system which are integrated in the cabinet body, and a PLC control system for controlling the whole nitrogen making machine to operate; the air source system comprises an air compressor and an air source purification device, wherein the air compressor is connected with and controlled by the PLC control system, and the air source purification device comprises an air condenser, a micro-mist separator and a polymer membrane type air dryer; the nitrogen making system comprises an air process tank connected with an air source purification device through a pipeline, a nitrogen making host machine connected with the air process tank through a pipeline and a general nitrogen process tank connected with the nitrogen making host machine through a pipeline, wherein the nitrogen making host machine comprises a first adsorption tower and a second adsorption tower which are arranged in parallel and alternately perform adsorption regeneration; the purification system comprises a deoxygenation tower connected with a common nitrogen process tank through a pipeline, a drying tank connected with the deoxygenation tower through a pipeline, a radiator arranged on the pipeline between the deoxygenation tower and the drying tank, and a dust filter connected with a drying tank air outlet end through a pipeline.
Preferably: the first adsorption tower and the second adsorption tower have the same structure and comprise an adsorption tower heat-insulation shell and an adsorption tower main body arranged in the inner cavity of the adsorption tower heat-insulation shell, wherein the adsorption tower main body comprises an adsorption tower cylinder, an upper end enclosure assembled at the top end of the adsorption tower cylinder, a lower end enclosure assembled at the bottom end of the adsorption tower cylinder, a pressure-equalizing diverter assembled in the middle of the adsorption tower cylinder and a pressing device assembled at the top end of the upper end enclosure; the interior of the cylinder body of the adsorption tower adopts a composite bed structure, the lower part of the cylinder body is filled with an activation treatment molecular sieve, and the upper part of the cylinder body is filled with a carbon molecular sieve; a sieve plate is arranged at the air outlet of the upper end enclosure; an adsorption tower splitter is arranged at the air inlet of the lower seal head, and a drying agent is filled in the inner cavity of the lower seal head.
Preferably: the deoxygenation tower comprises a deoxygenation tower heat-insulating shell and a deoxygenation tower main body arranged in an inner cavity of the deoxygenation tower heat-insulating shell, wherein the deoxygenation tower main body adopts an up-down layered compound structure and comprises an upper-layer deoxygenation cavity and a lower-layer buffer cavity; the deoxidation device is characterized in that a deoxidation catalyst is filled in the deoxidation cavity, and a heating module for heating the deoxidation catalyst is arranged, wherein the heating module comprises a plurality of groups of heating rods and a temperature sensor for detecting the temperature of the deoxidation catalyst, the temperature sensor is electrically connected with a PLC control system, and the heating rods are connected with and controlled by the PLC control system; the utility model discloses a deoxidation tower, including the deoxidation tower main part, be provided with the spiral intake pipe in the cushion chamber, the terminal of spiral intake pipe runs through the lateral wall of cushion chamber to be connected with the deoxidation tower shunt that sets up in the deoxidation chamber upper end through the intake pipe that sets up in the deoxidation tower main part outside.
Preferably: the air technology tank is provided with a first pressure sensor, a first pressure release valve and a blow-down valve, the first pressure sensor is electrically connected with the PLC control system, and the first pressure release valve is connected with and controlled by the PLC control system.
Preferably: and a second pressure sensor is installed on the first adsorption tower, a third pressure sensor is installed on the second adsorption tower, and the second pressure sensor and the third pressure sensor are respectively and electrically connected with the PLC control system.
Preferably: and a fourth pressure sensor and a second pressure release valve are installed on the common nitrogen process tank, the fourth pressure sensor is electrically connected with the PLC control system, and the second pressure release valve is connected with and controlled by the PLC control system.
Preferably: and a fifth pressure sensor is installed on the drying tank and electrically connected with the PLC control system.
Preferably: the bottom four corners of the cabinet body are respectively provided with a mute caster.
Has the advantages that: compared with the prior art, the invention adopts the pressure swing adsorption and carbon reduction composite process to prepare the high-purity nitrogen, and has the following advantages: 1. the equipment has compact structure and reasonable layout, and realizes the miniaturization of high-purity nitrogen production equipment; 2. the equipment has reliable performance and high automation degree, adopts the advanced numerical control technology to automatically monitor, automatically adjust and safely protect the main parameters in the production process, greatly reduces the starting time of the equipment and shortens the nitrogen discharging waiting time; 3. the prepared nitrogen has high purity, low dew point and high cleanliness; 4. the equipment is easy to operate and convenient to maintain.
Drawings
FIG. 1 is a schematic external perspective view of the present invention;
FIG. 2 is a schematic view of the internal perspective structure of the present invention;
FIG. 3 is a schematic top view of the internal structure of the present invention;
FIG. 4 is a schematic view of the structure of an adsorption column according to the present invention;
FIG. 5 is a schematic view of the configuration of a deoxygenator column according to the present invention;
FIG. 6 is a schematic structural view of a main body of a deoxygenator column according to the present invention;
FIG. 7 is a process flow diagram of the present invention.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
Examples
Referring to fig. 1 to 7, the small-sized high-purity nitrogen generator according to the embodiment includes a cabinet 1, and an air source system, a nitrogen generating system, a purifying system integrated in the cabinet 1, and further includes a PLC control system for controlling the operation of the whole nitrogen generator. In order to facilitate the transfer of the nitrogen making machine, silent casters 34 are respectively mounted at four corners of the bottom of the cabinet body 1. Wherein:
the air source system comprises an air compressor 2 and an air source purification device, wherein the air compressor 2 is connected with and controlled by a PLC control system, and the air source purification device comprises an air condenser 3, a micro-mist separator 4 and a polymer membrane type air dryer 5.
An air source generated by the air compressor 2 is cooled by the air condenser 3 and enters the micro-mist separator 4, most of water mist and oil mist are condensed in the liquid storage cup after being filtered and separated by the micro-mist separator 4, the water level in the liquid storage cup reaches a certain height and then is automatically discharged from the bottom, and a little residual moisture in the compressed air is discharged from the polymer membrane type air dryer 5. The air source purification device enables the adsorption tower to have the best separation working condition, the use effect and the service life of the molecular sieve of the adsorption tower are guaranteed, and the quality of separated nitrogen is guaranteed.
The air-cooled swinging piston type air compressor is adopted to provide an air source, the air compressor 2 is designed without oil, the output air is fresh and clean, a special crank design is adopted, the verticality is better during working, the operation is stable, and the air-supply quick pulse is small. The standardized assembly process is adopted, the high-quality bearings are matched, the air inlet and outlet valves are specially treated, the vibration of the whole machine is small after the operation, the operation is stable, and the noise is low.
The nitrogen making system comprises an air process tank 6 connected with an air source purification device through a pipeline, a nitrogen making host machine connected with the air process tank 6 through a pipeline, and a general nitrogen process tank 7 connected with the nitrogen making host machine through a pipeline, wherein the nitrogen making host machine comprises a first adsorption tower 8 and a second adsorption tower 9, and the two adsorption towers are arranged in parallel and alternately perform adsorption regeneration. The first adsorption tower 8 and the second adsorption tower 9 have the same structure and comprise an adsorption tower heat-insulating shell 14 and an adsorption tower main body arranged in the inner cavity of the adsorption tower heat-insulating shell 14, wherein the adsorption tower main body comprises an adsorption tower cylinder 15, an upper end enclosure 16 assembled at the top end of the adsorption tower cylinder 15, a lower end enclosure 17 assembled at the bottom end of the adsorption tower cylinder 15, a pressure-equalizing diverter 18 assembled in the middle of the adsorption tower cylinder 15 and a pressing device 19 assembled at the top end of the upper end enclosure 16. The interior of the adsorption tower cylinder body 15 adopts a composite bed structure, the lower part of the adsorption tower cylinder body is filled with an activation treatment molecular sieve, and the upper part of the adsorption tower cylinder body is filled with a carbon molecular sieve. And a sieve plate 20 is arranged at the air outlet of the upper end enclosure 16. An adsorption tower splitter 21 is arranged at the air inlet of the lower seal head 17, and a drying agent is filled in the inner cavity of the lower seal head 17.
The air technology tank 6 is provided with a first pressure sensor 27, a first pressure release valve 28 and a blow-down valve 35, the first pressure sensor 27 is electrically connected with the PLC control system, and the first pressure release valve 28 is connected with and controlled by the PLC control system. The first pressure sensor 27 is used for collecting the pressure value in the air process tank 6 to control the first pressure release valve 28 to automatically open and release pressure, so that the air compressor 2 can be automatically released after being started without pressure and the system is overpressurized, and the whole system can be safely and efficiently operated. The air process tank 6 reduces the airflow pulsation of the compressed air, and plays a role in stabilizing pressure, buffering and stabilizing flow, thereby reducing the influence of the system on the purity of the product gas due to pressure fluctuation. Simultaneously, also for nitrogen making system when carrying out the adsorption tower work and switching, provide the required a large amount of compressed air that steps up rapidly in the short time, not only make the adsorption tower internal pressure can rise to operating pressure fast, but also guaranteed the reliable and stable operation of equipment.
The first adsorption tower 8 is provided with a second pressure sensor 32, the second adsorption tower 9 is provided with a third pressure sensor 33, and the second pressure sensor 32 and the third pressure sensor 33 are respectively electrically connected with the PLC control system. The activation treatment molecular sieve and the carbon molecular sieve in the first adsorption tower 8 and the second adsorption tower 9 adopt a stretching torsion type vibration filling method, so that the filling density of the molecular sieve is ensured, and the molecular sieve is not pulverized in the filling process. The two adsorption towers are alternately subjected to adsorption regeneration under the control of the PLC control system, so that nitrogen and oxygen separation can be completed, and continuous output of nitrogen can be guaranteed. The compressed air enters the activation treatment molecular sieve after being diffused by the splitter 21 of the adsorption tower, so that the moisture in the compressed air is further adsorbed, and the moisture-containing dew point of the air passing through the carbon molecular sieve is ensured to be below minus 45 ℃.
And a fourth pressure sensor 29 and a second pressure release valve 30 are installed on the common nitrogen process tank 7, the fourth pressure sensor 29 is electrically connected with the PLC control system, and the second pressure release valve 30 is connected with and controlled by the PLC control system. The general nitrogen process tank 7 has the main function of balancing the purity and pressure of nitrogen separated from a nitrogen making host machine and ensuring continuous supply of stable nitrogen. At the moment when the two adsorption towers are switched, the adsorption towers can be refilled with part of gas per se, so that the molecular sieve is protected, and the pressure of the adsorption towers is boosted. Meanwhile, the common nitrogen process tank 7 matched with the adsorption tower can ensure that the nitrogen making machine is quickly started after being stopped for a long time and is started for supplying gas after being stopped for a short time, and plays an important process auxiliary role.
The purification system comprises a deoxygenation tower 10 connected with a common nitrogen process tank 7 through a pipeline, a drying tank 11 connected with the deoxygenation tower 10 through a pipeline, a radiator 12 arranged on a pipeline between the deoxygenation tower 10 and the drying tank 11, and a dust filter 13 connected with an air outlet end pipeline of the drying tank 11. The deoxygenation tower 10 comprises a deoxygenation tower heat-insulating shell 22 and a deoxygenation tower main body arranged in the inner cavity of the deoxygenation tower heat-insulating shell 22, wherein the deoxygenation tower main body adopts an upper-lower layered compound structure and comprises a deoxygenation cavity on the upper layer and a buffer cavity on the lower layer. The deoxidation device is characterized in that a deoxidation catalyst is filled in the deoxidation cavity, a heating module for heating the deoxidation catalyst is arranged, the heating module comprises a plurality of groups of heating rods 23 and a temperature sensor for detecting the temperature of the deoxidation catalyst, the temperature sensor is electrically connected with the PLC control system, and the heating rods 23 are connected with and controlled by the PLC control system. The interior of the buffer cavity is provided with a spiral air inlet pipe 24, the tail end of the spiral air inlet pipe 24 penetrates through the side wall of the buffer cavity and is connected with a deoxygenation tower flow divider 26 arranged at the upper end of the deoxygenation cavity through an air inlet pipe 25 arranged on the outer side of the main body of the deoxygenation tower. The PLC control system respectively controls the start and stop of each group of heating rods 23 according to the temperature of the deoxygenation catalyst detected by the temperature sensor in the deoxygenation tower 10. The spiral air inlet pipe 24 is arranged in the buffer cavity, so that the heat exchange area is increased, the waste heat of the product gas is fully utilized to preheat the inlet air, the temperature of the inlet air is increased, and the temperature difference between the upper end and the lower end of the deoxygenation tower 10 is reduced.
The deoxygenation catalyst filled in the deoxygenation tower 10 is 3093 series inert gas deoxygenation catalyst, and the temperature of the deoxygenation catalyst is accurately controlled through a PLC control system and a heating module. The 3093 series inert gas deoxygenation catalyst can directly remove trace oxygen in nitrogen produced by a nitrogen making machine host, and the raw material gas does not need to be quantitatively added with hydrogen in the reaction process, and has no requirement on pressure. Further, since the deoxidation capacity of this deoxidation catalyst is 100 times larger than that of a general deoxidizer, frequent regeneration is not required. The prepared high-purity nitrogen is cooled by a radiator 12, and then enters a drying tank 11 to remove water from the finished nitrogen again, so that the dew point of the output nitrogen is ensured to meet the design requirement. Finally, the nitrogen is conveyed to gas utilization equipment after passing through a dust filter 13 and a pressure reducing valve, and the quality of the finished nitrogen is fully ensured.
And a fifth pressure sensor 31 is installed on the drying tank 11, and the fifth pressure sensor 31 is electrically connected with the PLC control system.
The air compressor 2, the air condenser 3, the micro-mist separator 4, the polymer membrane type air dryer 5, the air process tank 6, the common nitrogen process tank 7, the drying tank 11, the radiator 12 and the dust filter 13 in the invention all adopt the existing equipment on the market, are the prior art, and the specific structure and the working principle are not described herein again.
The working principle of the invention is briefly described as follows:
the compressed high-temperature air with pressure from an air compressor 2 is cooled by an air condenser 3 and enters a micro-mist separator 4 to remove oil content and most of moisture in the air, then enters a polymer membrane type air dryer 5 for further deep water removal, the obtained purified compressed air enters an air process tank 6 for buffering and pressure stabilization and then enters a nitrogen making host machine consisting of two adsorption towers for separation and nitrogen making, the two adsorption towers alternately work to generate continuous common nitrogen with the purity of more than or equal to 99.9 percent, the prepared common nitrogen enters a common nitrogen process tank 7 for buffering and pressure stabilization and then enters a deoxygenation tower 10, and at a certain temperature, common nitrogen is deoxidized under the action of a deoxidation catalyst to obtain high-purity nitrogen, the high-purity nitrogen enters a drying tank 11 for dehydration again, and finally solid particles in the gas are filtered by a dust filter 13 and then are conveyed to gas-using equipment through a pressure reducing valve.
The invention adopts the pressure swing adsorption and carbon reduction composite process to prepare the high-purity nitrogen, and has the following advantages: 1. the equipment has compact structure and reasonable layout, and realizes the miniaturization of high-purity nitrogen production equipment; 2. the equipment has reliable performance and high automation degree, adopts the advanced numerical control technology to automatically monitor, automatically adjust and safely protect the main parameters in the production process, greatly reduces the starting time of the equipment and shortens the nitrogen discharging waiting time; 3. the prepared nitrogen has high purity, low dew point and high cleanliness; 4. the equipment is easy to operate and convenient to maintain.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures made by using the contents of the specification and the drawings of the present invention can be directly or indirectly applied to other related technical fields, and are within the scope of the present invention.
Claims (8)
1. A small-sized high-purity nitrogen making machine comprises a cabinet body (1), and an air source system, a nitrogen making system and a purification system which are integrated in the cabinet body (1), and further comprises a PLC control system for controlling the operation of the whole nitrogen making machine; the method is characterized in that: the air source system comprises an air compressor (2) and an air source purification device, wherein the air compressor (2) is connected with and controlled by a PLC control system, and the air source purification device comprises an air condenser (3), a micro-mist separator (4) and a polymer membrane type air dryer (5); the nitrogen making system comprises an air process tank (6) connected with an air source purification device through a pipeline, a nitrogen making host machine connected with the air process tank (6) through a pipeline, and a common nitrogen process tank (7) connected with the nitrogen making host machine through a pipeline, wherein the nitrogen making host machine comprises a first adsorption tower (8) and a second adsorption tower (9), and the two adsorption towers are arranged in parallel and alternately perform adsorption regeneration; the purification system comprises a deoxygenation tower (10) connected with a common nitrogen process tank (7) through a pipeline, a drying tank (11) connected with the deoxygenation tower (10) through a pipeline, a radiator (12) arranged on the pipeline between the deoxygenation tower (10) and the drying tank (11), and a dust filter (13) connected with the drying tank (11) through an air outlet end pipeline.
2. The compact, high purity nitrogen generator of claim 1, wherein: the first adsorption tower (8) and the second adsorption tower (9) have the same structure and comprise an adsorption tower heat-insulation shell (14) and an adsorption tower main body arranged in the inner cavity of the adsorption tower heat-insulation shell (14), wherein the adsorption tower main body comprises an adsorption tower cylinder (15), an upper end enclosure (16) assembled at the top end of the adsorption tower cylinder (15), a lower end enclosure (17) assembled at the bottom end of the adsorption tower cylinder (15), a pressure-equalizing diverter (18) assembled at the middle part of the adsorption tower cylinder (15) and a compressing device (19) assembled at the top end of the upper end enclosure (16); the interior of the adsorption tower cylinder (15) adopts a composite bed structure, the lower part of the adsorption tower cylinder is filled with an activation treatment molecular sieve, and the upper part of the adsorption tower cylinder is filled with a carbon molecular sieve; a sieve plate (20) is arranged at the air outlet of the upper end enclosure (16); an adsorption tower diverter (21) is arranged at the air inlet of the lower seal head (17), and a drying agent is filled in the inner cavity of the lower seal head (17).
3. The compact, high purity nitrogen generator of claim 1, wherein: the deoxygenation tower (10) comprises a deoxygenation tower heat-insulating shell (22) and a deoxygenation tower main body arranged in the inner cavity of the deoxygenation tower heat-insulating shell (22), wherein the deoxygenation tower main body adopts an upper-lower layered compound structure and comprises an upper-layer deoxygenation cavity and a lower-layer buffer cavity; the deoxidation device is characterized in that a deoxidation catalyst is filled in the deoxidation cavity, and a heating module for heating the deoxidation catalyst is arranged, wherein the heating module comprises a plurality of groups of heating rods (23) and a temperature sensor for detecting the temperature of the deoxidation catalyst, the temperature sensor is electrically connected with a PLC control system, and the heating rods (23) are connected with and controlled by the PLC control system; the device is characterized in that a spiral air inlet pipe (24) is arranged in the buffer cavity, the tail end of the spiral air inlet pipe (24) penetrates through the side wall of the buffer cavity, and is connected with a deoxygenation tower shunt (26) arranged at the upper end of the deoxygenation cavity through an air inlet pipe (25) arranged on the outer side of the main body of the deoxygenation tower.
4. The compact high purity nitrogen generator of any one of claims 1 to 3, wherein: install first pressure sensor (27), first relief valve (28) and blowoff valve (35) on air technology jar (6), first pressure sensor (27) and PLC control system electric connection, first relief valve (28) connect and be controlled by PLC control system.
5. The compact high purity nitrogen generator of any one of claims 1 to 3, wherein: the adsorption tower is characterized in that a second pressure sensor (32) is installed on the first adsorption tower (8), a third pressure sensor (33) is installed on the second adsorption tower (9), and the second pressure sensor (32) and the third pressure sensor (33) are respectively electrically connected with the PLC control system.
6. The compact high purity nitrogen generator of any one of claims 1 to 3, wherein: install fourth pressure sensor (29) and second relief valve (30) on general nitrogen technology jar (7), fourth pressure sensor (29) and PLC control system electric connection, second relief valve (30) connect and be controlled by PLC control system.
7. The compact high purity nitrogen generator of any one of claims 1 to 3, wherein: and a fifth pressure sensor (31) is installed on the drying tank (11), and the fifth pressure sensor (31) is electrically connected with the PLC control system.
8. The compact high purity nitrogen generator of any one of claims 1 to 3, wherein: the four corners of the bottom of the cabinet body (1) are respectively provided with a mute caster (34).
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| CN201911192797.9A CN110817812A (en) | 2019-11-28 | 2019-11-28 | Small-size high-purity nitrogen generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113603065A (en) * | 2021-08-27 | 2021-11-05 | 广东鑫钻节能科技股份有限公司 | Air compression station for preparing high-purity nitrogen |
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