CN107973279B - Single-tower air separation type nitrogen production system and method - Google Patents
Single-tower air separation type nitrogen production system and method Download PDFInfo
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- CN107973279B CN107973279B CN201810011360.XA CN201810011360A CN107973279B CN 107973279 B CN107973279 B CN 107973279B CN 201810011360 A CN201810011360 A CN 201810011360A CN 107973279 B CN107973279 B CN 107973279B
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 187
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 92
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000000926 separation method Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000001179 sorption measurement Methods 0.000 claims abstract description 75
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 59
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 59
- 239000001301 oxygen Substances 0.000 claims abstract description 59
- 238000005406 washing Methods 0.000 claims abstract description 5
- 238000003860 storage Methods 0.000 claims description 42
- 239000007789 gas Substances 0.000 claims description 29
- 239000006096 absorbing agent Substances 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 12
- 239000003463 adsorbent Substances 0.000 claims description 10
- 239000013527 degreasing agent Substances 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Classifications
-
- 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
- C01B21/0455—Physical processing only by adsorption in solids characterised by the adsorbent
- C01B21/0461—Carbon based materials
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Gases By Adsorption (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention relates to a single-tower air separation type nitrogen production system and a method, wherein the single-tower air separation type nitrogen production system comprises an air compressor, a dryer, an alkaline washing tank, a blower, an oil remover, a single-tower adsorber and a nitrogen buffer tank, wherein the air compressor, the oil remover, the single-tower adsorber and the nitrogen buffer tank are sequentially connected, and the single-tower adsorber comprises an adsorber outer tank body and an adsorption core; the adsorption core comprises a sealed tank body with a switchable adsorption head arranged around; the switchable adsorption heads on the adsorption core are divided into two groups, and the two groups of switchable adsorption heads work alternately; the system adopts a nitrogen making adsorber, when one side of the switchable adsorption head is full of oxygen, the switchable adsorption head is automatically converted into a closed state to release oxygen, the other side of the switchable adsorption head is converted into a working state to adsorb oxygen, and the two groups of switchable adsorption heads alternately work to ensure the continuous proceeding of the nitrogen making process.
Description
Technical Field
The invention relates to a single-tower air separation type nitrogen production system and a method, and belongs to the technical field of nitrogen production.
Background
With the economic development, the technology research and development of civil industry is independent of gas industry and low-temperature technology, and the global economic growth, especially the national economic growth, so that the air separation market prospect is good and the situation is optimistic. The development of industries such as petrochemical, electronic, chemical fiber, polysilicon and the like requires more and more high purity nitrogen. The nitrogen making equipment belongs to the energy-saving environment-friendly category of national encouragement development. The chemical property of nitrogen is inactive, has great inertia in a normal state, and is not easy to react with other substances. Therefore, nitrogen is widely used as a shielding gas in glass, oil refining, metallurgy, electronics and chemical industries, has a very wide application prospect, and is an industrial gas with rapidly growing demands.
At present, nitrogen is mainly prepared by separating nitrogen in air, wherein the main gases are nitrogen and oxygen, the content of the nitrogen exceeds seventy-eight percent, and the content of the oxygen exceeds twenty-one percent. At present, the existing nitrogen making machine mainly comprises an air compressor, a nitrogen making adsorption tank and a nitrogen storage tank, wherein the separation of nitrogen and oxygen is carried out in the nitrogen making adsorption tank, and after air passes through the nitrogen making adsorption tank, the oxygen in the air is adsorbed by active carbon in the nitrogen making adsorption tank. Because the adsorption capacity of the activated carbon is limited, after a certain amount of oxygen is adsorbed, the oxygen needs to be released, then the adsorption is carried out, and in order to continuously carry out the nitrogen production process, the existing nitrogen production machine is provided with two nitrogen production adsorption tanks which alternately work, so that the continuous production of nitrogen is ensured. However, this undoubtedly increases the equipment cost investment, and the equipment is too large to be used for mobile operations.
Disclosure of Invention
The invention aims to provide a single-tower air separation type nitrogen making system and a method, and in order to achieve the purposes, the invention adopts the following technical scheme:
the utility model provides a single tower air separation formula nitrogen generation system, includes air compressor machine, desicator, alkaline wash pond, air-blower, degreaser, single tower adsorber, nitrogen buffer tank, and wherein air compressor machine, degreaser, single tower adsorber and nitrogen buffer tank connect gradually, are provided with air pretreatment equipment at the air inlet end of air compressor machine, and this pretreatment equipment includes alkaline wash pond, desicator to install the air-blower at alkaline wash pond front end, its characterized in that: the nitrogen discharge pipe is connected with the exhaust pipe of the single tower adsorber, the tail end of the nitrogen discharge pipe is provided with a purity detection box, two pipelines are separated from the purity detection box, one pipeline is connected with the nitrogen buffer tank, the other pipeline is connected with the temporary storage box, and electromagnetic valves are respectively arranged on the two pipelines; the temporary storage box is connected with a pipeline between the air compressor and the oil remover through a pipeline, and an electromagnetic valve is respectively arranged on an air flow upstream pipeline at the joint of the two pipelines; the system is provided with a master controller for controlling each component; an oxygen collecting pipe is arranged at the upper part of the single-tower adsorber, an electromagnetic valve is arranged on the oxygen collecting pipe, and the tail end of the oxygen collecting pipe is connected with an oxygen storage tank; the single-tower type adsorber comprises an adsorber outer tank body and an adsorption core, wherein the adsorption core is fixedly arranged in the adsorber outer tank body through a fixing piece; the lower part of the outer tank body of the absorber is provided with a bottom cover which is sunken downwards, the back surface of the outer tank body is provided with a driving device, the lower end surface of the absorbing core is provided with an air inlet pipe communicated with the inside of the absorbing core, and the air inlet pipe penetrates through the bottom cover; the adsorption core comprises a sealed tank body with a switchable adsorption head arranged at the periphery, a sealing flange is arranged at the lower edge of the sealed tank body, and a butt joint sealing flange is correspondingly arranged at the inner surface of the bottom cover; the switchable adsorption heads on the adsorption core are divided into two groups, and the two groups of switchable adsorption heads work alternately; the switchable adsorption head comprises a fixed body connected with the sealed tank body into a whole, a cylindrical cavity is arranged in the middle of the fixed body, and an adsorbent mounting pipe is arranged in the middle of the cylindrical cavity; the two sides of the cylindrical cavity and the adsorbent mounting tube are respectively provided with a vent hole and a through hole, wherein the vent holes are communicated with the outer tank body of the adsorber and the adsorption core; the middle part of the adsorbent mounting tube is provided with a rotating shaft in an axial penetrating way, the lower end of the rotating shaft penetrates through the bottom cover, a gear is mounted at the lower end of the rotating shaft, and the gear is driven by a corresponding driving device; an oxygen collecting cavity is arranged inside one side of the fixed body, the oxygen collecting cavity is communicated with the cylindrical cavity through a communication hole, and an oxygen discharging pipe is arranged at the upper end of the oxygen collecting cavity, penetrates through the outer tank body of the absorber and is communicated with the oxygen collecting pipe.
In the nitrogen production equipment, one nitrogen production absorber, namely a single tower absorber, is adopted, but a switchable absorbing head capable of alternately working is arranged in the single tower absorber, when one side of the switchable absorbing head is full of oxygen, the switchable absorbing head is automatically converted into a closed state to release oxygen, the other side of the switchable absorbing head is converted into a working state to absorb oxygen, and the two groups of switchable absorbing heads alternately work to ensure the continuous proceeding of the nitrogen production process. Compared with the existing nitrogen production equipment, the equipment has low cost and high efficiency, and is convenient for moving operation because the equipment occupies less space.
As an optimal scheme, an air temporary storage tank is arranged between the dryer and the air compressor. The air temporary storage tank is used for temporarily accumulating the preliminarily filtered air, so that the air compressor can have a sufficient air source.
As an optimal scheme, an air pressure detector is arranged in the temporary storage box, the air pressure detector is connected with a master controller, and the master controller is used for controlling an electromagnetic valve on a pipeline connected with the temporary storage box and an electromagnetic valve between an air compressor and an oil remover.
As an optimal scheme, an oxygen detector is arranged in the purity detection box, the oxygen detector is connected with a master controller, and electromagnetic valves on two pipelines separated from the purity detection box are controlled by the master controller.
Preferably, the lower part of the single tower adsorber is provided with supporting legs.
Preferably, a secondary cover is arranged at the bottom of the outer tank body of the absorber, and the secondary cover is arranged on the bottom cover through bolts. The lower part of the single tower type absorber is provided with a driving device and a gear, and the auxiliary cover is arranged to protect the devices from damage.
Preferably, a sealing inner layer is arranged on the inner wall of the cylindrical cavity.
According to an improvement of the invention, a method for producing nitrogen by using the single-tower air separation type nitrogen production system is also provided, and the method comprises the following steps:
a. starting a blower to enable the air to pass through an alkaline washing tank to remove acid gas in the air, then pass through a dryer to remove water in the air, and then enabling the gas to enter an air temporary storage tank for temporary storage;
b. starting an air compressor through a master controller, pumping air in an air temporary storage tank by the air compressor, enabling the air to pass through an oil remover to remove oil gas, and enabling the air to enter a single-tower adsorber;
c. the main controller controls the switchable adsorption heads on one side in the single-tower type adsorber to be closed, so that the switchable adsorption heads on the other side are opened, at the moment, the adsorption of oxygen in the air is carried out, after reaching a preset time, the switchable adsorption heads which have adsorbed the oxygen are closed, and the other group of switchable adsorption heads are opened, so that the switchable adsorption heads work alternately, and the single-tower type adsorber is in a continuous working state.
d. And nitrogen discharged by the single tower type adsorber enters the nitrogen buffer tank.
As a preferable scheme, the nitrogen prepared by the single tower type adsorber is detected by a purity detection box before entering a nitrogen buffer tank, and unqualified gas can be re-entered into the single tower type adsorber in a temporary storage box for filtering.
As a preferable scheme, unqualified gas is registered in a temporary storage box before entering the single-tower absorber again, and the gas enters the single-tower absorber after the gas pressure in the temporary storage box reaches a certain value.
In the nitrogen production method, the nitrogen is subjected to preliminary purification before entering the air compressor, and the gases such as carbon dioxide, sulfur dioxide and the like in the air are removed, so that the nitrogen production method is suitable for the air in any region, and can remove the miscellaneous gases in the air to the greatest extent. In the deoxidization adsorption stage of air, the existing deoxidization process is completed by means of alternate work of two nitrogen-making adsorbers, and the equipment in the working mode has high equipment cost, large equipment occupation space and inconvenient movement. In the scheme, a single-tower adsorber is used, and the inside of the single-tower adsorber is provided with switchable adsorption heads capable of alternately working, so that the equipment investment cost is greatly saved, and the nitrogen production process is simplified. The gas with impurities is also subjected to secondary filtration, so that the purity of the prepared nitrogen can be effectively ensured.
Drawings
Fig. 1 is a schematic diagram of the present invention during use.
FIG. 2 is a schematic view showing the overall structure of the single-column adsorber of the present invention.
Fig. 3 is a schematic view showing the structure of the bottom cover in the inverted state of the single tower adsorber of the invention.
Fig. 4 is a schematic view of the back structure of the bottom cover of the present invention.
FIG. 5 is a schematic view of the semi-sectional structure of a single-tower adsorber of the invention.
FIG. 6 is a schematic view showing the installation structure of the adsorption core in the inverted state of the single tower adsorber of the invention.
FIG. 7 is a schematic view showing the overall structure of the adsorption core of the single-column adsorber of the invention.
Fig. 8 is a schematic structural view of a switchable adsorption head of the adsorption core of the present invention.
Fig. 9 is a schematic diagram showing a half-sectional structure of the switchable adsorption head of the present invention.
In the figure, an air compressor 1, an air temporary storage tank 2, a dryer 3, an alkaline washing tank 4, a blower 5, an oil remover 6, a single tower adsorber 7, a nitrogen gas discharge pipe 8, a nitrogen buffer tank 9, a purity detection tank 10, a temporary storage tank 11, an oxygen storage tank 12, an electromagnetic valve 13, an oxygen detector 14, an air pressure detector 15, a general controller 16, an adsorber outer tank 701, a support leg 702, an air intake 703, an exhaust pipe 704, a bottom cover 705, a sub cover 706, an oxygen collecting pipe 707, a rotating shaft 708, a gear 709, a driving device 710, an adsorption core 711, a fixing piece 712, a switchable adsorption head 713, a sealing flange 714, a fixing body 715, a cylindrical cavity 716, a vent hole 717, an oxygen discharge pipe 718, an adsorbent mounting pipe 720, an oxygen collecting chamber 721, a through hole 722, a communication hole 723, a sealing inner layer 724, and a butt sealing flange 725.
Detailed Description
As shown in the figure, a single tower air separation formula nitrogen generation system, including air compressor machine 1, desicator 3, alkaline wash pond 4, air-blower 5, degreaser 6, single tower adsorber 7, nitrogen buffer tank 9, wherein air compressor machine 1, degreaser 6, single tower adsorber 7 and nitrogen buffer tank 9 connect gradually, be provided with air pretreatment equipment at air compressor machine 1's air inlet end, this pretreatment equipment includes alkaline wash pond 4, desicator 3 to install air-blower 5 at alkaline wash pond 4 front end, its characterized in that: the nitrogen discharge pipe 8 is connected with the discharge pipe 704 of the single tower adsorber 7, the tail end of the nitrogen discharge pipe 8 is provided with a purity detection box 10, two pipelines are separated from the purity detection box 10, one pipeline is connected with the nitrogen buffer tank 9, the other pipeline is connected with the temporary storage box 11, and the two pipelines are respectively provided with electromagnetic valves 13; the temporary storage box 11 is connected with a pipeline between the air compressor 1 and the oil remover 6 through a pipeline, and an electromagnetic valve 13 is respectively arranged on an air flow upstream pipeline at the joint of the two pipelines; the system is provided with a general controller 16 controlling the various components; an oxygen collecting pipe 707 is arranged at the upper part of the single tower adsorber 7, an electromagnetic valve 13 is arranged on the oxygen collecting pipe 707, and the tail end of the oxygen collecting pipe 707 is connected with an oxygen storage tank 12; the single-tower adsorber 7 comprises an adsorber outer tank 701 and an adsorption core 711, wherein the adsorption core 711 is fixedly arranged inside the adsorber outer tank 701 through a fixing piece 712; a bottom cover 705 is arranged at the lower part of the outer tank 701 of the absorber, the bottom cover 705 is sunken downwards, a driving device 710 is arranged at the back surface, an air inlet pipe 703 communicated with the inside of the adsorption core 711 is arranged at the lower end surface of the adsorption core 711, and the air inlet pipe 703 penetrates through the bottom cover 705; a sealed tank body of the adsorption core 711, comprising a switchable adsorption head 713 arranged around, a sealing flange 714 arranged at the lower edge of the sealed tank body, and a butt sealing flange 725 correspondingly arranged at the inner surface of the bottom cover 705; the switchable adsorption heads 713 on the adsorption core 711 are divided into two groups, and the two groups of switchable adsorption heads 713 work alternately; the switchable adsorption head 713 comprises a fixed body 715 connected with the sealed tank body into a whole, a cylindrical cavity 716 is arranged in the middle of the fixed body 715, and an adsorbent mounting tube 720 is mounted in the middle of the cylindrical cavity 716; the two sides of the cylindrical cavity 716 and the adsorbent mounting tube 720 are respectively provided with a vent 717 and a through hole 722, wherein the vent 717 is communicated with the outer tank 701 of the adsorber and the adsorption core 711; the middle part of the adsorbent mounting tube 720 is provided with a rotating shaft 708 in a penetrating way along the axial direction, the lower end of the rotating shaft 708 passes through the bottom cover 705, a gear 709 is mounted at the lower end of the rotating shaft 708, and the gear 709 is driven by a corresponding driving device 710; an oxygen collecting chamber 721 is provided inside one side of the fixed body 715, the oxygen collecting chamber 721 communicates with the cylindrical chamber 716 through a communication hole 723, and an oxygen discharging pipe 718 is provided at an upper end of the oxygen collecting chamber 721, and the oxygen discharging pipe 718 passes through the adsorber outer tank 701 and communicates with the oxygen collecting pipe 707.
As a preferable scheme, an air temporary storage tank 2 is arranged between the dryer 3 and the air compressor 1. The air temporary storage tank 2 is used for temporarily accumulating the preliminarily filtered air, so that the air compressor 1 can have a sufficient air source.
As a preferable scheme, an air pressure detector 15 is installed in the temporary storage box 11, the air pressure detector 15 is connected with a master controller 16, and the master controller 16 controls an electromagnetic valve 13 on a pipeline connected with the temporary storage box 11 and the electromagnetic valve 13 between the air compressor 1 and the oil remover 6.
Preferably, an oxygen detector 14 is installed in the purity detection box 10, the oxygen detector 14 is connected with a master controller 16, and electromagnetic valves 13 on two pipelines separated from the purity detection box 10 are controlled by the master controller 16.
Preferably, the lower part of the single tower adsorber 7 is provided with support legs 702.
Preferably, a secondary cover 706 is disposed at the bottom of the adsorber outer tank 701, and the secondary cover 706 is mounted on the bottom cover 705 by bolts. The lower part of the single tower adsorber 7 is provided with a drive device 710 and a gear 709, and a secondary cover 706 is provided to protect these devices from damage.
Preferably, a sealing inner layer 724 is disposed on the inner wall of the cylindrical cavity 716.
In the nitrogen production equipment, one nitrogen production absorber, namely a single tower absorber 7 is adopted, but a switchable absorbing head 713 which can work alternately is arranged in the single tower absorber 7, when one side of the switchable absorbing head 713 is full of oxygen, the switchable absorbing head 713 is automatically converted into a closed state to release oxygen, the other side of the switchable absorbing head 713 is converted into a working state to absorb oxygen, and the two groups of the switchable absorbing heads 713 work alternately to ensure the continuous nitrogen production process. Compared with the existing nitrogen production equipment, the equipment has low cost and high efficiency, and is convenient for moving operation because the equipment occupies less space.
According to an improvement of the invention, a method for producing nitrogen by using the single-tower air separation type nitrogen production system is also provided, and the method comprises the following steps:
a. starting a blower 5 to enable the air to pass through an alkaline washing tank 4 to remove acid gas in the air, then pass through a dryer 3 to remove water in the air, and then enabling the air to enter an air temporary storage tank 2 for temporary storage;
b. starting an air compressor 1 through a master controller 16, pumping air in an air temporary storage tank 2 by the air compressor 1, enabling the air to pass through an oil remover 6 to remove oil gas, and enabling the air to enter a single-tower adsorber 7;
c. the main controller 16 controls the switchable adsorption heads 713 on one side in the single-tower adsorber 7 to be closed, so that the switchable adsorption heads 713 on the other side are opened, at the moment, the adsorption of oxygen in the air is carried out, after reaching a preset time, the switchable adsorption heads 713 which have adsorbed the oxygen are closed, and the other group of switchable adsorption heads 713 are opened, so that the switchable adsorption heads 713 alternately work, and the single-tower adsorber 7 is in a continuous working state.
d. The nitrogen removed by the single tower adsorber 7 enters the nitrogen buffer tank 9.
Preferably, the nitrogen gas prepared by the single tower adsorber 7 is detected by the purity detection box 10 before entering the nitrogen buffer tank 9, and the unqualified gas is re-entered into the single tower adsorber 7 in the temporary storage box 11 for filtering.
Preferably, the unqualified gas is stored in the temporary storage tank 11 before entering the single tower adsorber 7 again, and the gas enters the single tower adsorber 7 after the air pressure in the temporary storage tank 11 reaches a certain value.
In the nitrogen production method, the nitrogen is subjected to preliminary purification before entering the air compressor 1, and the gases such as carbon dioxide, sulfur dioxide and the like in the air are removed, so that the method is suitable for the air in any region, and the miscellaneous gases in the air can be removed to the greatest extent. In the deoxidization adsorption stage of air, the existing deoxidization process is completed by means of alternate work of two nitrogen-making adsorbers, and the equipment in the working mode has high equipment cost, large equipment occupation space and inconvenient movement. In the scheme, a single-tower adsorber 7 is used, and a switchable adsorption head 713 which can work alternately is arranged in the single-tower adsorber, so that the equipment investment cost is greatly saved, and the nitrogen making process is simplified. The gas with impurities is also subjected to secondary filtration, so that the purity of the prepared nitrogen can be effectively ensured.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (10)
1. The utility model provides a single tower air separation formula nitrogen generation system, includes air compressor machine, desicator, alkaline wash pond, air-blower, degreaser, single tower adsorber, nitrogen gas discharge pipe, nitrogen buffer tank, and wherein air compressor machine, degreaser, single tower adsorber and nitrogen buffer tank connect gradually, are provided with air pretreatment equipment at the air inlet end of air compressor machine, and this pretreatment equipment includes alkaline wash pond, desicator to install the air-blower at alkaline wash pond front end, its characterized in that: the nitrogen discharge pipe is connected with the exhaust pipe of the single tower adsorber, the tail end of the nitrogen discharge pipe is provided with a purity detection box, two pipelines are separated from the purity detection box, one pipeline is connected with the nitrogen buffer tank, the other pipeline is connected with the temporary storage box, and electromagnetic valves are respectively arranged on the two pipelines; the temporary storage box is connected with a pipeline between the air compressor and the oil remover through a pipeline, and an electromagnetic valve is respectively arranged on an air flow upstream pipeline at the joint of the two pipelines; the system is provided with a master controller for controlling each component; the upper part of the single tower type adsorber is provided with an oxygen collecting pipe, an electromagnetic valve is arranged on the oxygen collecting pipe, and the tail end of the oxygen collecting pipe is connected with an oxygen storage tank; the single-tower type adsorber comprises an adsorber outer tank body and an adsorption core, wherein the adsorption core is fixedly arranged in the adsorber outer tank body through a fixing piece; the lower part of the outer tank body of the absorber is provided with a bottom cover which is sunken downwards, the back surface of the outer tank body is provided with a driving device, the lower end surface of the absorbing core is provided with an air inlet pipe communicated with the inside of the absorbing core, and the air inlet pipe penetrates through the bottom cover; the adsorption core comprises a sealed tank body with a switchable adsorption head arranged at the periphery, a sealing flange is arranged at the lower edge of the sealed tank body, and a butt joint sealing flange is correspondingly arranged at the inner surface of the bottom cover; the switchable adsorption heads on the adsorption core are divided into two groups, and the two groups of switchable adsorption heads work alternately; the switchable adsorption head comprises a fixed body connected with the sealed tank body into a whole, a cylindrical cavity is arranged in the middle of the fixed body, and an adsorbent mounting pipe is arranged in the middle of the cylindrical cavity; the two sides of the cylindrical cavity and the adsorbent mounting tube are respectively provided with a vent hole and a through hole, wherein the vent holes are communicated with the outer tank body of the adsorber and the adsorption core; the middle part of the adsorbent mounting tube is provided with a rotating shaft in an axial penetrating way, the lower end of the rotating shaft penetrates through the bottom cover, a gear is mounted at the lower end of the rotating shaft, and the gear is driven by a corresponding driving device; an oxygen collecting cavity is arranged inside one side of the fixed body, the oxygen collecting cavity is communicated with the cylindrical cavity through a communication hole, and an oxygen discharging pipe is arranged at the upper end of the oxygen collecting cavity, penetrates through the outer tank body of the absorber and is communicated with the oxygen collecting pipe.
2. A single tower air separation nitrogen generation system according to claim 1, wherein: an air temporary storage tank is arranged between the dryer and the air compressor.
3. A single tower air separation nitrogen generation system according to claim 1, wherein: the temporary storage box is internally provided with an air pressure detector, the air pressure detector is connected with a master controller, and the master controller is used for controlling an electromagnetic valve on a pipeline connected with the temporary storage box and an electromagnetic valve between the air compressor and the oil remover.
4. A single tower air separation nitrogen generation system according to claim 1, wherein: an oxygen detector is arranged in the purity detection box and connected with a master controller, and electromagnetic valves on two pipelines separated from the purity detection box are controlled by the master controller.
5. A single tower air separation nitrogen generation system according to claim 1, wherein: the lower part of the single tower type absorber is provided with supporting legs.
6. A single tower air separation nitrogen generation system according to claim 1, wherein: the bottom of the outer tank body of the absorber is provided with an auxiliary cover, and the auxiliary cover is arranged on the bottom cover through bolts.
7. A single tower air separation nitrogen generation system according to claim 1, wherein: and a sealing inner layer is arranged on the inner wall of the cylindrical cavity.
8. A method of producing nitrogen using a single column air separation nitrogen generation system as claimed in any one of claims 1 to 7, wherein: the nitrogen production method comprises the following steps:
a. starting a blower to enable the air to pass through an alkaline washing tank to remove acid gas in the air, then pass through a dryer to remove water in the air, and then enabling the gas to enter an air temporary storage tank for temporary storage;
b. starting an air compressor through a master controller, pumping air in an air temporary storage tank by the air compressor, enabling the air to pass through an oil remover to remove oil gas, and enabling the air to enter a single-tower adsorber;
c. the method comprises the steps that a master controller controls a switchable adsorption head on one side in a single-tower adsorber to be closed, the switchable adsorption head on the other side is opened, at the moment, adsorption of oxygen in air is carried out, after reaching a preset time, the switchable adsorption head which has adsorbed the oxygen is closed, the other group of switchable adsorption heads is opened, and thus the alternating work of the switchable adsorption heads is carried out, so that the single-tower adsorber is in a continuous working state;
d. and nitrogen discharged by the single tower type adsorber enters the nitrogen buffer tank.
9. The method for producing nitrogen according to claim 8, wherein: the nitrogen prepared by the single tower type adsorber is detected by a purity detection box before entering the nitrogen buffer tank, and unqualified gas can be filtered in the temporary storage box after entering the single tower type adsorber again.
10. The method for producing nitrogen according to claim 9, wherein: the unqualified gas is deposited in the temporary storage box before entering the single tower absorber again, and the gas enters the single tower absorber after the gas pressure in the temporary storage box reaches a certain value.
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| CN107973279A (en) | 2018-05-01 |
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