CN215216879U - Device for preparing high-purity nitrogen - Google Patents

Device for preparing high-purity nitrogen Download PDF

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Publication number
CN215216879U
CN215216879U CN202121072122.3U CN202121072122U CN215216879U CN 215216879 U CN215216879 U CN 215216879U CN 202121072122 U CN202121072122 U CN 202121072122U CN 215216879 U CN215216879 U CN 215216879U
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nitrogen
purity
rectifying
tower
molecular sieve
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CN202121072122.3U
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Chinese (zh)
Inventor
蒋彬
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SUZHOU OXYGEN PLANT CO Ltd
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SUZHOU OXYGEN PLANT CO Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/044—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a single pressure main column system only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/90—Details relating to column internals, e.g. structured packing, gas or liquid distribution
    • F25J2200/94—Details relating to the withdrawal point
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/42—Nitrogen or special cases, e.g. multiple or low purity N2
    • F25J2215/44—Ultra high purity nitrogen, i.e. generally less than 1 ppb impurities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/02—Bath type boiler-condenser using thermo-siphon effect, e.g. with natural or forced circulation or pool boiling, i.e. core-in-kettle heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/20—Boiler-condenser with multiple exchanger cores in parallel or with multiple re-boiling or condensing streams

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The utility model discloses a device for preparing high-purity nitrogen, including air compressor, air precooling unit, molecular sieve purification device, main heat exchanger, rectifying column, multichannel condensation evaporimeter, expander, subcooler. The stripping section is arranged in the rectifying tower, so that hydrogen in nitrogen can be removed in the stripping section, and high-purity nitrogen can be directly obtained from the middle upper part of the rectifying tower or high-purity liquid nitrogen is extracted and gasified to provide high-purity nitrogen for customers. The whole device has simple structure and simple and convenient operation, avoids the use of catalyst and greatly saves investment and subsequent maintenance cost.

Description

Device for preparing high-purity nitrogen
Technical Field
The utility model relates to a device of preparation high-purity nitrogen gas belongs to the mechanical engineering field, especially prepares the industrial gas field at low temperature.
Background
Nitrogen is a chemically stable gas and is widely applied to the industries of electronics, chemical engineering, machinery, metallurgy, food and the like. With the rapid development of national economy, the requirements of various industries on the quality and the dosage of high-purity nitrogen are increasing day by day. According to the national standard, the content of hydrogen in the high-purity nitrogen is less than or equal to 1 ppm. The hydrogen content in the air is about 1ppm, and the conventional cryogenic rectification device and method cannot remove the hydrogen, so that the hydrogen is enriched in the nitrogen and exceeds the requirement of high-purity nitrogen. It is common in industry to remove hydrogen by chemical means, and reduce the hydrogen content by reacting the hydrogen in the air with oxygen over a catalyst to produce water. Catalysts are usually made of precious metals, which are expensive, short-lived, complex to operate and have to be replaced regularly.
SUMMERY OF THE UTILITY MODEL
In view of the above prior art not enough, the utility model provides a device for preparing high-purity nitrogen adopts the rectifying column to separate out high-purity nitrogen from the air under the condition that does not use any noble metal catalyst.
In order to achieve the above object, the utility model provides a following technical scheme:
a device for preparing high-purity nitrogen comprises an air compressor, an air precooling unit, a molecular sieve purifying device, a main heat exchanger, a rectifying tower, a multi-channel condensation evaporator, an expansion machine and a subcooler;
the air compressor, the air precooling unit, the molecular sieve purifying device, the main heat exchanger and the rectifying tower are sequentially connected through pipelines, the upper end of the rectifying tower is connected with the multichannel condensing evaporator through a pipeline, the subcooler is connected with the multichannel condensing evaporator through a pipeline, the inlet of the expansion machine is connected with the subcooler, and the outlet of the expansion machine is connected with the main heat exchanger.
The rectifying tower comprises an upper part and a lower part, wherein the lower part is a rectifying section and is used for separating nitrogen and hydrogen from air; the upper part is a stripping section used for separating out hydrogen in the nitrogen, thereby preparing high-purity liquid nitrogen or high-purity nitrogen.
A high-purity liquid nitrogen outlet or a high-purity nitrogen outlet is arranged between the rectifying section and the stripping section, the high-purity liquid nitrogen outlet is connected with a pipeline of the multi-channel condensation evaporator, high-purity liquid nitrogen is obtained at the high-purity liquid nitrogen outlet and is extracted out, the high-purity liquid nitrogen enters the multi-channel condensation evaporator after being throttled by a throttle valve, the high-purity liquid nitrogen is used as a cold source to exchange heat with hydrogen-rich gas at the top of the rectifying tower and is gasified into high-purity nitrogen, and the high-purity nitrogen is reheated by a main heat exchanger and then is sent to a client for use as a product; or obtaining high-purity nitrogen at the high-purity nitrogen outlet, directly reheating the high-purity nitrogen with the main heat exchanger through the throttle valve, and then sending the high-purity nitrogen to a client for use.
The rectifying section of the rectifying tower is selected from one of a sieve plate tower and a packed tower.
The stripping section of the rectifying tower is selected from one of a sieve plate tower and a packed tower.
A preferred type of expander is a turboexpander.
The molecular sieve purification device comprises at least two groups of molecular sieve purifiers which can work alternately.
The device for preparing high-purity nitrogen further comprises an electric heater, and the electric heater is respectively connected with the at least two groups of molecular sieve purifiers through pipelines.
Compared with the prior art, the utility model discloses following beneficial effect has been obtained:
the invention avoids the use of catalyst, reduces economic cost and reduces energy consumption of the system. The stripping section is arranged in the rectifying tower, hydrogen in the nitrogen is removed in the stripping section, and high-purity nitrogen is directly obtained from the middle upper part of the rectifying tower or liquid nitrogen is extracted and then gasified, so that the high-purity nitrogen can be provided for customers. The whole device is simple in structure, simple and convenient to operate and high in safety, and investment and subsequent maintenance cost are greatly saved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the present invention;
wherein like reference numerals in figures 1 and 2 refer to like devices.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1, the nitrogen generator in the present embodiment includes an Air Compressor (AC), an air pre-chiller (RU), a molecular sieve purification device, a main heat exchanger (E1), a rectification column (C), a multi-pass condensation evaporator (K), an Expander (ET), a subcooler (E2), and an Electric Heater (EH);
wherein, Air Compressor (AC), air precooler group (RU), molecular sieve purification device, main heat exchanger (E1) and rectifying column (C) loop through the tube coupling, rectifying column (C) comprises rectifying section (C1) and the stripping section (C2) of upper portion of lower part, multichannel condensation evaporimeter (K) is connected to rectifying column (C) upper end, and multichannel condensation evaporimeter (K) side export is connected with subcooler (E2), and the export of subcooler (E2) is connected with the entry of Expander (ET), and the exit linkage of Expander (ET) is to main heat exchanger (E1).
The molecular sieve purification device comprises two groups of molecular sieve purifiers (MS1, MS2) which work alternately, and the Electric Heater (EH) is respectively connected with the two groups of molecular sieve purifiers (MS1, MS2) through pipelines.
After filtering large-particle impurities in the air, introducing the large-particle impurities into an Air Compressor (AC), and pressurizing the air by the Air Compressor (AC) and then sending the air into an air pre-cooler unit (RU). The precooled air enters a molecular sieve purifier (MS1, MS2) to adsorb moisture and CO in the air2、C2H2And the like. The air further purified by the molecular sieve purifiers (MS1 and MS2) enters a main heat exchanger (E1), and is directly fed into a rectifying tower (C) for rectification after being cooled by return gas. Nitrogen and hydrogen are separated from air in the rectifying section (C1) of the rectifying column (C), and then hydrogen in nitrogen is separated in the stripping section (C2). Through calculation, high-purity liquid nitrogen is obtained at a proper position of the rectifying tower (C) and is pumped out, and enters the condensation evaporator (K) after being throttled by the throttle valve (V1) to be used as a cold source to exchange heat with hydrogen-rich gas at the top of the rectifying tower (C) and be gasified into high-purity nitrogen and high-purity nitrogenThe nitrogen is reheated by the main heat exchanger (E1) and then sent to a client as a product for use. Liquid nitrogen obtained after condensation and liquefaction of the hydrogen-rich gas at the tower top of the rectifying tower (C) enters the upper part of the rectifying tower (C) again to be used as reflux liquid, and non-condensable gas is discharged. In the rectification process, liquid air is extracted from the bottom of the rectification tower (C), is subcooled by a subcooler (E2), is throttled by a throttle valve (V2), enters a condensation evaporator (K) and is also used as a cold source to liquefy nitrogen. The gasified oxygen-enriched gas sequentially passes through a subcooler (E2) and a main heat exchanger (E1) and then enters an expansion machine (ET), the expanded oxygen-enriched gas enters the main heat exchanger (E1) again and then is divided into two paths, one path is discharged to the outside, the other path enters an Electric Heater (EH) to be heated and then enters molecular sieve purifiers (MS1 and MS2), and the molecular sieve purifiers (MS1 and MS2) are subjected to regeneration and activation.
Example two:
as shown in FIG. 2, this example is identical to the first example except that the rectifying column separates high purity nitrogen gas and the rectifying column is refluxed with liquid nitrogen at the top of the rectifying column. The specific modes of the rectifying tower for separating high-purity nitrogen and the rectifying tower top liquid nitrogen reflux mode are as follows:
nitrogen and hydrogen are separated from air in the rectifying section (C1) of the rectifying column (C), and then hydrogen in nitrogen is separated in the stripping section (C2). And calculating to obtain high-purity nitrogen at a proper position of the rectifying tower (C), and reheating the high-purity nitrogen through a throttle valve (V1) and a main heat exchanger (E1) to be used as a product to be sent to a client for use. In the rectification process, liquid air is extracted from the bottom of the rectification tower (C), is subcooled by a subcooler (E2), is throttled by a throttle valve (V2), enters a condensation evaporator (K) and is used as a cold source to liquefy nitrogen. Liquid nitrogen obtained after condensation and liquefaction of the hydrogen-rich gas at the tower top of the rectifying tower (C) enters the upper part of the rectifying tower (C) again to be used as reflux liquid, and non-condensable gas is discharged.
It introduces in detail above the device for preparing high-purity nitrogen provided by the utility model, and it is right to have used specific individual example herein the utility model discloses a structure and theory of operation have been elucidated, and the explanation of above embodiment is only used for helping to understand the utility model discloses a core thought. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the scope of the appended claims.

Claims (8)

1. A device for preparing high-purity nitrogen comprises an air compressor, an air precooling unit, a molecular sieve purifying device, a main heat exchanger, a rectifying tower, a multi-channel condensation evaporator, an expansion machine and a subcooler;
the air compressor, the air precooler unit, the molecular sieve purifying device, the main heat exchanger and the rectifying tower are sequentially connected through a pipeline;
the method is characterized in that: the upper end of the rectifying tower is connected with the pipeline of the multi-channel condensation evaporator, the subcooler is connected with the pipeline of the multi-channel condensation evaporator, the inlet of the expansion machine is connected with the subcooler, and the outlet of the expansion machine is connected with the main heat exchanger.
2. The apparatus of claim 1, wherein: the rectifying tower comprises an upper part and a lower part: the lower part is a rectifying section used for separating nitrogen and hydrogen from air; the upper part is a stripping section used for separating out hydrogen in the nitrogen, thereby preparing high-purity liquid nitrogen or high-purity nitrogen.
3. The apparatus of claim 2, wherein: and a high-purity liquid nitrogen or high-purity nitrogen outlet is arranged between the rectifying section and the stripping section, and the high-purity liquid nitrogen outlet is connected with the pipeline of the multi-channel condensation evaporator or the high-purity nitrogen outlet is directly connected with the pipeline of the main heat exchanger.
4. The apparatus according to any one of claims 1-3, wherein: the rectifying section of the rectifying tower is selected from one of a sieve plate tower and a packed tower.
5. The apparatus according to any one of claims 1-3, wherein: the stripping section of the rectifying tower is selected from one of a sieve plate tower and a packed tower.
6. The apparatus according to any one of claims 1-3, wherein: the expander is a turbine expander.
7. The apparatus according to any one of claims 1-3, wherein: the molecular sieve purification device comprises at least two groups of molecular sieve purifiers which can work alternately.
8. The apparatus of claim 7, wherein: the electric heater is connected with the at least two groups of molecular sieve purifiers through pipelines respectively.
CN202121072122.3U 2021-05-19 2021-05-19 Device for preparing high-purity nitrogen Active CN215216879U (en)

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CN202121072122.3U CN215216879U (en) 2021-05-19 2021-05-19 Device for preparing high-purity nitrogen

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