CN112093782A - Nitrogen purification system and nitrogen purification method - Google Patents
Nitrogen purification system and nitrogen purification method Download PDFInfo
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Abstract
The invention discloses a nitrogen purification system, which relates to the technical field of nitrogen preparation and comprises an air purification unit, an oxygen-nitrogen separation unit, a nitrogen buffer unit, a hydrodeoxygenation unit, a nitrogen drying unit and a nitrogen storage unit; the nitrogen-oxygen separation unit comprises an adsorption tower, the nitrogen buffer unit comprises a nitrogen buffer tank, the hydrodeoxygenation unit comprises a hydrogen storage tank and a deoxygenation tower, and a palladium catalyst bed layer is arranged in the deoxygenation tower; the air purification unit is communicated with the adsorption tower, the adsorption tower is communicated with a nitrogen buffer tank, the nitrogen buffer tank is connected with the oxygen removal tower through a purification pipeline, and the hydrogen storage tank is communicated with the purification pipeline; the oxygen removing tower is communicated with the nitrogen drying unit, and the nitrogen drying unit is communicated with the nitrogen storage unit. The invention also provides a nitrogen purification method. The invention has the beneficial effects that: according to the invention, nitrogen in air is removed through the adsorption tower, oxygen impurities in the nitrogen and hydrogen are subjected to chemical reaction through the oxygen removal tower to generate water, and the purity of the nitrogen is improved.
Description
Technical Field
The invention relates to the technical field of nitrogen preparation, in particular to a nitrogen purification system and a nitrogen purification method.
Background
The valve seat ring or the valve guide pipe needs to take nitrogen as protective atmosphere in the preparation process, for example, a patent with the publication number of CN108588577A discloses a valve seat ring and a preparation process thereof, and the valve seat ring is taken as protective atmosphere in the preparation process, and the patent application with the publication number of CN104785772A discloses a valve guide pipe and a powder metallurgy production process thereof, and discloses that nitrogen and hydrogen are taken as protective atmosphere for sintering in the sintering process of the valve guide pipe.
The nitrogen used in the preparation process of the valve seat ring or the valve guide pipe is purified nitrogen, for example, a patent with the publication number of CN202139054U discloses a nitrogen purification system, solves the problems that the purified nitrogen in the traditional nitrogen purification system has high water content and can not meet the production requirement, and uses the air as an air source, and when the nitrogen in the air is purified, the purity of the nitrogen is influenced because the oxygen is contained in the air.
Disclosure of Invention
The invention aims to solve the technical problem that oxygen impurities are contained in the nitrogen purification process, and provides a nitrogen purification system.
The invention solves the technical problems through the following technical means:
the invention provides a nitrogen purification system, which comprises an air purification unit, an oxygen-nitrogen separation unit, a nitrogen buffer unit, a hydrodeoxygenation unit, a nitrogen drying unit and a nitrogen storage unit, wherein the nitrogen storage unit is arranged above the oxygen-nitrogen separation unit;
the nitrogen-oxygen separation unit comprises an adsorption tower, a molecular sieve is arranged in the adsorption tower, the nitrogen buffer unit comprises a nitrogen buffer tank, the hydrodeoxygenation unit comprises a hydrogen storage tank and a deoxygenation tower, and a palladium catalyst bed layer is arranged in the deoxygenation tower;
the air purification unit is communicated with an adsorption tower, the adsorption tower is communicated with a nitrogen buffer tank, the nitrogen buffer tank is connected with a deaerating tower through a purification pipeline, and the hydrogen storage tank is communicated with the purification pipeline; the oxygen removal tower is communicated with the nitrogen drying unit, and the nitrogen drying unit is communicated with the nitrogen storage unit.
The working principle is as follows: the air purifies the back through air purification unit, let in the adsorption tower, molecular sieve through in the adsorption tower is to oxygen, carbon dioxide impurity adsorbs the back, obtain preliminary purification's nitrogen gas, let in the nitrogen gas buffer tank, then let in the oxygen-eliminating tower through the purification pipeline, hydrogen lets in the oxygen-eliminating tower through the purification pipeline from the hydrogen holding vessel, under the effect on oxygen-eliminating tower palladium catalyst layer, make oxygen impurity in the nitrogen gas and the hydrogen of adding take place chemical reaction and generate water, then let in the drying unit and dry, it stores for subsequent use to let in the nitrogen gas storage unit at last.
Has the advantages that: according to the invention, nitrogen in air is removed through the adsorption tower, oxygen impurities in the nitrogen and hydrogen are subjected to chemical reaction to generate water through the oxygen removal tower, oxygen impurities in the nitrogen purification process are further removed, and the purity of the nitrogen is improved.
Preferably, the air purification unit comprises an air compressor, a first air buffer tank, an oil remover, an air dryer, a filter, a catalytic purifier and a second air buffer tank;
the air outlet of the air compressor is connected with the air inlet of the first air buffer tank through a first pipeline, the air outlet of the first air buffer tank is connected with the air inlet of the oil remover through a second pipeline, the air outlet of the oil remover is connected with the air inlet of the air dryer through a third pipeline, the air outlet of the air dryer is connected with the air inlet of the filter through a fourth pipeline, the air outlet of the filter is connected with the air inlet of the catalytic purifier through a fifth pipeline, and the air outlet of the catalytic purifier is connected with the air inlet of the second air buffer tank through a sixth pipeline.
Has the advantages that: air is compressed by the air compressor and then is introduced into the first air buffer tank from the first pipeline, and is introduced into the filter from the fourth pipeline after entering the air dryer from the third pipeline through the oil remover so as to remove part of water, dust and impurities in the air, and then is introduced into the catalytic purifier from the fifth pipeline, and is introduced into the second air buffer tank from the sixth pipeline after being purified by the catalytic purifier.
Preferably, the air dryer comprises a first air dryer and a second air dryer, one end of the third pipeline is connected with the air outlet of the oil remover, the other end of the third pipeline is connected with the first air dryer, a seventh pipeline is arranged on the side wall of the third pipeline, one end of the seventh pipeline is connected with the side wall of the third pipeline, and the other end of the seventh pipeline is connected with the air inlet of the second air dryer;
one end of the fourth pipeline is connected with the air outlet of the first air dryer, the other end of the fourth pipeline is connected with the air inlet of the filter, an eighth pipeline is arranged on the side wall of the fourth pipeline, one end of the eighth pipeline is connected with the side wall of the third pipeline, and the other end of the eighth pipeline is connected with the air outlet of the second air dryer;
the pipeline structure is characterized in that a first valve is arranged on the first pipeline, a third valve is arranged on the third pipeline, a fourth valve is arranged on the fourth pipeline, a seventh valve is arranged on the seventh pipeline, and an eighth valve is arranged on the eighth pipeline.
Has the advantages that: first air dryer and the parallelly connected setting of second air dryer through control third valve, fourth valve, seventh valve and eighth valve, make first air dryer and second air dryer switch back and forth, realize alternate use and maintenance, improve work efficiency.
Preferably, the adsorption tower comprises a first adsorption tower and a second adsorption tower, one end of the seventeenth pipeline is connected with the air outlet of the second air buffer tank, the other end of the seventeenth pipeline is connected with the air inlet of the first adsorption tower, a ninth pipeline is arranged on the seventeenth pipeline, one end of the ninth pipeline is connected with the side wall of the seventeenth pipeline, and the other end of the ninth pipeline is connected with the air inlet of the second adsorption tower;
and a seventeenth valve is arranged on the seventeenth pipeline, and a ninth valve is arranged on the ninth pipeline.
Has the advantages that: first adsorption tower and second adsorption tower are parallelly connected the setting in the working line, through control ninth valve and seventeenth valve, make first adsorption tower and second adsorption tower switch back and forth, can realize alternate use, make things convenient for later stage maintenance and change.
Preferably, the nitrogen buffer unit further comprises a dust filter, a tenth pipeline is arranged on the first adsorption tower, one end of the tenth pipeline is connected with the air outlet of the first adsorption tower, and the other end of the tenth pipeline is connected with the air inlet of the nitrogen buffer tank; an eleventh pipeline is arranged on the tenth pipeline, one end of the eleventh pipeline is connected with the side wall of the tenth pipeline, and the other end of the eleventh pipeline is connected with an air outlet of the second adsorption tower;
and a twelfth pipeline is arranged on the nitrogen buffer tank, one end of the twelfth pipeline is connected with the air outlet of the nitrogen buffer tank, and the other end of the twelfth pipeline is connected with the dust filter.
Has the advantages that: and impurities in the nitrogen are further removed by arranging a dust filter.
Preferably, the one end of purification pipeline is connected with dust filter's gas outlet, the other end of purification pipeline is connected with the air inlet of oxygen-eliminating tower, the hydrogen holding vessel passes through the thirteenth pipeline and is connected with purification pipeline lateral wall, be equipped with the thirteenth valve on the thirteenth pipeline.
Preferably, the nitrogen drying unit comprises a dryer, a fourteenth pipeline is arranged on the oxygen removing tower, one end of the fourteenth pipeline is connected with an air outlet of the oxygen removing tower, and the other end of the fourteenth pipeline is connected with an air inlet of the dryer.
Preferably, the nitrogen gas storage unit includes nitrogen gas storage jar, be equipped with the fifteenth pipeline on the nitrogen gas storage jar, the one end of fifteenth pipeline is connected with freeze dryer's gas outlet, the other end of fifteenth pipeline is connected with the air inlet of nitrogen gas storage jar, the gas outlet of nitrogen gas storage jar is equipped with the sixteenth pipeline, be equipped with the sixteenth valve on the sixteenth pipeline.
Has the advantages that: the purified nitrogen is stored in a nitrogen storage tank and is led out from a sixteenth pipeline when required for use.
The invention aims to solve the technical problem that oxygen impurities are contained in the nitrogen purification process, and provides a nitrogen purification method adopting a nitrogen purification system.
A nitrogen purification process comprising the steps of:
(1) introducing air into an air purification unit, purifying the air by the air purification unit, introducing the air into an adsorption tower, adsorbing oxygen and carbon dioxide by a molecular sieve in the adsorption tower to prepare primarily purified nitrogen, and introducing the primarily purified nitrogen into a nitrogen buffer tank;
(2) nitrogen gas in the nitrogen buffer tank enters the oxygen-eliminating tower through a purification pipeline, hydrogen is introduced into the oxygen-eliminating tower from the hydrogen storage tank through the purification pipeline, oxygen impurities in the nitrogen are removed through a palladium catalyst layer in the oxygen-eliminating tower, then the nitrogen is introduced into the drying unit to be dried, and the dried nitrogen is stored in the nitrogen storage unit.
Has the advantages that: according to the invention, nitrogen in air is removed through the adsorption tower, oxygen impurities in the nitrogen and hydrogen are subjected to chemical reaction to generate water through the oxygen removal tower, oxygen impurities in the nitrogen purification process are further removed, and the purity of the nitrogen is improved.
By adopting the nitrogen purification method, the purity of the prepared nitrogen is more than or equal to 99.9995 percent, the content of pure nitrogen and oxygen is less than or equal to 5ppm, and the dew point of the pure nitrogen is less than or equal to-70 ℃.
Preferably, the hydrogen in the hydrogen storage tank is introduced into the purification pipeline after the pressure is regulated to 0.8 Mpa.
The working principle of the invention is as follows: the air purifies the back through air purification unit, let in the adsorption tower, molecular sieve through in the adsorption tower is to oxygen, carbon dioxide impurity adsorbs the back, obtain preliminary purification's nitrogen gas, let in the nitrogen gas buffer tank, then let in the oxygen-eliminating tower through the purification pipeline, hydrogen lets in the oxygen-eliminating tower through the purification pipeline from the hydrogen holding vessel, under the effect on oxygen-eliminating tower palladium catalyst layer, make oxygen impurity in the nitrogen gas and the hydrogen of adding take place chemical reaction and generate water, then let in the drying unit and dry, it stores for subsequent use to let in the nitrogen gas storage unit at last.
The invention has the advantages that: according to the invention, nitrogen in air is removed through the adsorption tower, oxygen impurities in the nitrogen and hydrogen are subjected to chemical reaction to generate water through the oxygen removal tower, oxygen impurities in the nitrogen purification process are further removed, and the purity of the nitrogen is improved.
By adopting the nitrogen purification system, the purity of the prepared nitrogen is more than or equal to 99.9995 percent, the content of pure nitrogen and oxygen is less than or equal to 5ppm, and the dew point of the pure nitrogen is less than or equal to-70 ℃.
Drawings
FIG. 1 is a schematic diagram of a partial configuration of a nitrogen purification system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a partial configuration of a nitrogen purification system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a partial configuration of a nitrogen purification system according to an embodiment of the present invention;
in the figure: the end point in fig. 1 is a, the connection point in fig. 1 and fig. 2 is a, the end point in fig. 2 is B, and the connection point in fig. 2 and fig. 3 is B;
an air compressor 111; a first air compressor 1111; a second air compressor 1112; a first air buffer tank 112; an oil separator 113; an air dryer 114; a first air dryer 1141; a second air dryer 1142; a filter 115; a catalytic converter 116; a second air buffer tank 117; an adsorption column 118; a first adsorption column 1181; a second adsorption column 1182; a nitrogen buffer tank 119; a dust filter 120; a hydrogen gas storage tank 121; a de-aeration tower 122; a dryer 123; a nitrogen storage tank 124; a first pipe 211; a first valve 212; a second conduit 213; a third conduit 214; a third valve 237; a fourth pipe 215; a fourth valve 236; a fifth pipe 216; a sixth pipe 217; a seventh conduit 218; a seventh valve 219; an eighth conduit 220; an eighth valve 221; a ninth conduit 222; a ninth valve 223; a tenth conduit 224; an eleventh pipe 225; a twelfth conduit 226; a purification line 227; a thirteenth conduit 228; a thirteenth valve 229; a fourteenth duct 230; a fifteenth pipe 231; a sixteenth conduit 232; a sixteenth valve 233; a seventeenth conduit 234; a seventeenth valve 235.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
A nitrogen purification system, as shown in fig. 1, 2 and 3, includes an air purification unit, an oxygen-nitrogen separation unit, a nitrogen buffer unit, a hydrodeoxygenation unit, a nitrogen drying unit and a nitrogen storage unit.
As shown in fig. 1 and 2, the air purification unit includes an air compressor 111, a first air buffer tank 112, an oil remover 113, an air dryer 114, a filter 115, a catalytic purifier 116, and a second air buffer tank 117; the air compressor 111, the first air buffer tank 112, the oil remover 113, the air dryer 114, the filter 115, the catalytic converter 116, and the second air buffer tank 117 are all conventional technologies in this embodiment.
One end of the first pipeline 211 is fixedly connected with an air outlet of the air compressor 111, the other end of the first pipeline 211 is fixedly connected with an air inlet of the first air buffer tank 112, an air outlet of the first air buffer tank 112 is fixedly connected with an air inlet of the oil remover 113 through the second pipeline 213, an air outlet of the oil remover 113 is fixedly connected with an air inlet of the air dryer 114 through the third pipeline 214, an air outlet of the air dryer 114 is fixedly connected with an air inlet of the filter 115 through the fourth pipeline 215, an air outlet of the filter 115 is fixedly connected with an air inlet of the catalytic purifier 116 through the fifth pipeline 216, and an air outlet of the catalytic purifier 116 is fixedly connected with an air inlet of the second air buffer tank 117 through the sixth pipeline 217.
In order to improve the working efficiency, the number of the air compressors 111 is two in this embodiment, the two air compressors are respectively a first air compressor 1111 and a second air compressor 1112, and an air outlet of the first air compressor 1111 and an air outlet of the second air compressor 1112 are respectively and fixedly connected to an air inlet of the first air buffer tank 112.
In order to improve the drying efficiency and facilitate alternate use and maintenance, in this embodiment, the air dryer 114 includes a first air dryer 1141 and a second air dryer 1142, one end of the third pipeline 214 is fixedly connected to the air outlet of the oil remover 113, the other end of the third pipeline 214 is fixedly connected to the air inlet of the first air dryer 1141, the side wall of the third pipeline 214 is fixedly connected to one end of the seventh pipeline 218, and the other end of the seventh pipeline 218 is fixedly connected to the air inlet of the second air dryer 1142; one end of the fourth pipeline 215 is fixedly connected to the air outlet of the first air dryer 1141, the other end of the fourth pipeline 215 is fixedly connected to the air inlet of the filter 115, one end of the eighth pipeline 220 is fixedly connected to the sidewall of the fourth pipeline 215, and the other end of the eighth pipeline 220 is fixedly connected to the air outlet of the second air dryer 1142.
To facilitate the control of the gas flow, a first valve 212 is installed on the first pipe 211, a third valve 237 is installed on the third pipe 214, a fourth valve 236 is installed on the fourth pipe 215, a seventh valve 219 is installed on the seventh pipe 218, and an eighth valve 221 is installed on the eighth pipe 220.
As shown in fig. 2, the oxygen-nitrogen separation unit includes an adsorption tower 118, and in order to improve the adsorption efficiency and facilitate later maintenance and replacement, in this embodiment, the adsorption tower 118 includes a first adsorption tower 1181 and a second adsorption tower 1182, one end of a seventeenth pipeline 234 is fixedly connected to the air outlet of the second air buffer tank 117, the other end of the seventeenth pipeline 234 is fixedly connected to the air inlet of the first adsorption tower 1181, one end of a ninth pipeline 222 is fixedly connected to a sidewall of the seventeenth pipeline 234, and the other end of the ninth pipeline 222 is fixedly connected to the air inlet of the second adsorption tower 1182. A seventeenth valve 235 is provided in the seventeenth pipe 234, and a ninth valve 223 is provided in the ninth pipe 222.
The nitrogen buffer unit comprises a nitrogen buffer tank 119 and a dust filter 120, one end of a tenth pipeline 224 is fixedly connected with an air outlet of the first adsorption tower 1181, and the other end of the tenth pipeline 224 is fixedly connected with an air inlet of the nitrogen buffer tank 119; one end of the eleventh pipeline 225 is fixedly connected to the sidewall of the tenth pipeline 224, and the other end of the eleventh pipeline 225 is fixedly connected to the gas outlet of the second adsorption tower 1182.
One end of the twelfth pipeline 226 is fixedly connected to the gas outlet of the nitrogen buffer tank 119, and the other end of the twelfth pipeline 226 is fixedly connected to the gas inlet of the dust filter 120.
As shown in fig. 2 and fig. 3, the hydrodeoxygenation unit includes a hydrogen storage tank 121 and an oxygen removal tower 122, a palladium catalyst bed is installed in the oxygen removal tower 122, and the installation manner of the palladium catalyst bed and the palladium catalyst bed is the prior art.
The nitrogen drying unit includes a dryer 123, in this embodiment, the dryer 123 is a freeze dryer 123 or a micro thermal adsorption dryer 123, and the dryer 123 is a prior art. One end of the fourteenth pipeline 230 is fixedly connected with the air outlet of the oxygen removing tower 122, and the other end of the fourteenth pipeline 230 is fixedly connected with the air inlet of the dryer 123. In this embodiment, the number of the dryers 123 may be two, and the two dryers 123 are provided in parallel.
The nitrogen storage unit comprises a nitrogen storage tank 124, one end of a fifteenth pipeline 231 is fixedly connected with an air outlet of the freeze dryer 123, the other end of the fifteenth pipeline 231 is fixedly connected with an air inlet of the nitrogen storage tank 124, and a sixteenth valve 233 is mounted on a sixteenth pipeline 232. The mounting mode of each pipeline, valve in this embodiment is prior art, and the valve can be for manual valve or pneumatic valve in this embodiment.
The working principle of the embodiment is as follows: the air is compressed by the air compressor 111, introduced into the first air buffer tank 112 through the first pipe 211, introduced into the air dryer 114 through the oil remover 113 and the third pipe 214, introduced into the filter 115 through the fourth pipe 215 to remove a part of water, dirt and impurities in the air, introduced into the catalytic converter 116 through the fifth pipe 216, purified by the catalytic converter 116, and introduced into the second air buffer tank 117 through the sixth pipe 217.
When the number of the air dryers 114 is two, the air is introduced into the first air dryer 1141 and/or the second air dryer 1142 by opening or closing the third valve 237, the fourth valve 236, the seventh valve 219, and the eighth valve 221.
The air in the second air buffer tank 117 is introduced into the first adsorption tower 1181 and the second adsorption tower 1182 through the seventeenth pipeline 234 and the ninth pipeline, and the air after adsorption and purification is introduced into the nitrogen buffer tank 119 through the tenth pipeline 224 and the eleventh pipeline 225. By opening or closing the seventeenth valve 235 or the ninth valve 223, the first adsorption tower 1181 and the second adsorption tower 1182 are switched back and forth, so that alternate use can be realized, and later maintenance and replacement are facilitated.
Gas in the nitrogen buffer tank 119 is introduced into the dust filter 120 from the twelfth pipeline 226, the filtered gas is introduced into the oxygen removing tower 122 from the purification pipeline 227, the pressure of hydrogen in the hydrogen storage tank 121 is regulated to 0.8Mpa, hydrogen in the hydrogen storage tank 121 is introduced into the purification pipeline 227 from the thirteenth pipeline 228, hydrogen and primarily purified nitrogen are introduced into the oxygen removing tower 122 together, hydrogen with corresponding flow is introduced according to the oxygen content of common nitrogen, under the action of a palladium catalyst in the oxygen removing tower 122, oxygen impurities in the nitrogen and the added hydrogen are subjected to chemical reaction to generate water, then the water is introduced into the dryer 123 through the fourteenth pipeline 230, and the dried gas is introduced into the nitrogen storage tank 124 through the fifteenth pipeline 231 and stored for later use.
The beneficial effects of this embodiment: according to the invention, nitrogen in air is removed through the adsorption tower 118, oxygen impurities in the nitrogen and hydrogen are subjected to chemical reaction to generate water through the oxygen removal tower 122, oxygen impurities in the nitrogen purification process are further removed, and the purity of the nitrogen is improved.
The first air dryer 1141 and the second air dryer 1142 are arranged in parallel, and the first air dryer 1141 and the second air dryer 1142 can be switched back and forth by controlling the third valve 237, the fourth valve 236, the seventh valve 219 and the eighth valve 221, so that the alternate use and the maintenance are realized, and the working efficiency is improved.
The first adsorption tower 1181 and the second adsorption tower 1182 are arranged in parallel in the working line, and the first adsorption tower 1181 and the second adsorption tower 1182 are switched back and forth by controlling the ninth valve 223 and the seventeenth valve 235, so that alternate use can be realized, and later-stage maintenance and replacement are facilitated.
By adopting the nitrogen purification system, the purity of the prepared nitrogen is more than or equal to 99.9995 percent, the content of pure nitrogen and oxygen is less than or equal to 5ppm, and the dew point of the pure nitrogen is less than or equal to-70 ℃.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A nitrogen purification system, characterized by: the device comprises an air purification unit, an oxygen-nitrogen separation unit, a nitrogen buffer unit, a hydrodeoxygenation unit, a nitrogen drying unit and a nitrogen storage unit;
the nitrogen-oxygen separation unit comprises an adsorption tower, a molecular sieve is arranged in the adsorption tower, the nitrogen buffer unit comprises a nitrogen buffer tank, the hydrodeoxygenation unit comprises a hydrogen storage tank and a deoxygenation tower, and a palladium catalyst bed layer is arranged in the deoxygenation tower;
the air purification unit is communicated with an adsorption tower, the adsorption tower is communicated with a nitrogen buffer tank, the nitrogen buffer tank is connected with a deaerating tower through a purification pipeline, and the hydrogen storage tank is communicated with the purification pipeline; the oxygen removal tower is communicated with the nitrogen drying unit, and the nitrogen drying unit is communicated with the nitrogen storage unit.
2. A nitrogen purification system as recited in claim 1, wherein: the air purification unit comprises an air compressor, a first air buffer tank, an oil remover, an air dryer, a filter, a catalytic purifier and a second air buffer tank;
the air outlet of the air compressor is connected with the air inlet of the first air buffer tank through a first pipeline, the air outlet of the first air buffer tank is connected with the air inlet of the oil remover through a second pipeline, the air outlet of the oil remover is connected with the air inlet of the air dryer through a third pipeline, the air outlet of the air dryer is connected with the air inlet of the filter through a fourth pipeline, the air outlet of the filter is connected with the air inlet of the catalytic purifier through a fifth pipeline, and the air outlet of the catalytic purifier is connected with the air inlet of the second air buffer tank through a sixth pipeline.
3. A nitrogen purification system as claimed in claim 2, wherein: the air dryer comprises a first air dryer and a second air dryer, one end of a third pipeline is connected with an air outlet of the oil remover, the other end of the third pipeline is connected with the first air dryer, a seventh pipeline is arranged on the side wall of the third pipeline, one end of the seventh pipeline is connected with the side wall of the third pipeline, and the other end of the seventh pipeline is connected with an air inlet of the second air dryer;
one end of the fourth pipeline is connected with the air outlet of the first air dryer, the other end of the fourth pipeline is connected with the air inlet of the filter, an eighth pipeline is arranged on the side wall of the fourth pipeline, one end of the eighth pipeline is connected with the side wall of the third pipeline, and the other end of the eighth pipeline is connected with the air outlet of the second air dryer;
the pipeline structure is characterized in that a first valve is arranged on the first pipeline, a third valve is arranged on the third pipeline, a fourth valve is arranged on the fourth pipeline, a seventh valve is arranged on the seventh pipeline, and an eighth valve is arranged on the eighth pipeline.
4. A nitrogen purification system as recited in claim 1, wherein: the adsorption tower comprises a first adsorption tower and a second adsorption tower, one end of a seventeenth pipeline is connected with an air outlet of a second air buffer tank, the other end of the seventeenth pipeline is connected with an air inlet of the first adsorption tower, a ninth pipeline is arranged on the seventeenth pipeline, one end of the ninth pipeline is connected with the side wall of the seventeenth pipeline, and the other end of the ninth pipeline is connected with an air inlet of the second adsorption tower;
and a seventeenth valve is arranged on the seventeenth pipeline, and a ninth valve is arranged on the ninth pipeline.
5. A nitrogen purification system as recited in claim 1, wherein: the nitrogen buffer unit also comprises a dust filter, a tenth pipeline is arranged on the first adsorption tower, one end of the tenth pipeline is connected with the air outlet of the first adsorption tower, and the other end of the tenth pipeline is connected with the air inlet of the nitrogen buffer tank; an eleventh pipeline is arranged on the tenth pipeline, one end of the eleventh pipeline is connected with the side wall of the tenth pipeline, and the other end of the eleventh pipeline is connected with an air outlet of the second adsorption tower;
and a twelfth pipeline is arranged on the nitrogen buffer tank, one end of the twelfth pipeline is connected with the air outlet of the nitrogen buffer tank, and the other end of the twelfth pipeline is connected with the dust filter.
6. A nitrogen purification system as recited in claim 1, wherein: the one end and the dust filter's of purification pipeline gas outlet are connected, the other end and the air inlet of oxygen-eliminating tower of purification pipeline are connected, the hydrogen holding vessel passes through the thirteenth pipeline and is connected with purification pipeline lateral wall, be equipped with the thirteenth valve on the thirteenth pipeline.
7. A nitrogen purification system as claimed in claim 6, wherein: the nitrogen drying unit comprises a dryer, a fourteenth pipeline is arranged on the deaerating tower, one end of the fourteenth pipeline is connected with a gas outlet of the deaerating tower, and the other end of the fourteenth pipeline is connected with a gas inlet of the dryer.
8. A nitrogen purification system as recited in claim 1, wherein: the nitrogen gas storage unit comprises a nitrogen gas storage tank, a fifteenth pipeline is arranged on the nitrogen gas storage tank, one end of the fifteenth pipeline is connected with the gas outlet of the freeze dryer, the other end of the fifteenth pipeline is connected with the gas inlet of the nitrogen gas storage tank, a sixteenth pipeline is arranged at the gas outlet of the nitrogen gas storage tank, and a sixteenth valve is arranged on the sixteenth pipeline.
9. A nitrogen purification method using the nitrogen purification system according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:
(1) introducing air into an air purification unit, purifying the air by the air purification unit, introducing the air into an adsorption tower, adsorbing oxygen and carbon dioxide by a molecular sieve in the adsorption tower to prepare primarily purified nitrogen, and introducing the primarily purified nitrogen into a nitrogen buffer tank;
(2) nitrogen gas in the nitrogen buffer tank enters the oxygen-eliminating tower through a purification pipeline, hydrogen is introduced into the oxygen-eliminating tower from the hydrogen storage tank through the purification pipeline, oxygen impurities in the nitrogen are removed through a palladium catalyst layer in the oxygen-eliminating tower, then the nitrogen is introduced into the nitrogen drying unit to be dried, and the dried nitrogen is stored in the nitrogen storage unit.
10. A nitrogen purification process according to claim 9, characterized in that: and the hydrogen in the hydrogen storage tank is introduced into the purification pipeline after the pressure is regulated to 0.8 Mpa.
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| CN114777417A (en) * | 2022-04-27 | 2022-07-22 | 宏芯气体(上海)有限公司 | Double-tower double-reboiler ultra-high purity nitrogen generator device |
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