CN206847223U - The double condensation stream backed expansion nitrogen making machines of double tower - Google Patents
The double condensation stream backed expansion nitrogen making machines of double tower Download PDFInfo
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- CN206847223U CN206847223U CN201720658797.3U CN201720658797U CN206847223U CN 206847223 U CN206847223 U CN 206847223U CN 201720658797 U CN201720658797 U CN 201720658797U CN 206847223 U CN206847223 U CN 206847223U
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Abstract
The utility model discloses a kind of double condensation stream backed expansion nitrogen making machines of double tower, including the air inlet pretreatment unit and nitrogen-making device interconnected by pipeline, air inlet pretreatment unit to include air cleaner, air compressor, Precooling unit and purifier；Nitrogen-making device includes main heat exchanger, the subcooler for cooling, rectifying column, main condenser evaporator, auxiliary condenser/evaporator and the expanding machine for heat exchange, rectifying column includes Xia Ta, upper tower, lower tower is provided with air intake, and the air intake connects by pipeline and by main heat exchanger with purifier.The double condensation stream backed expansion nitrogen making machines of double tower provided by the utility model, using oxygen-enriched liquid air in main condenser evaporator and auxiliary condenser/evaporator stepped evaporation, realize in the case where obtaining the high-purity gas nitrogen product of equal pressure, compared with conventional double tower list condenses the high-purity nitrogen making machine of stream backed expansion, air compressor row pressure can be reduced, reduce power consumption, processing air capacity can be reduced simultaneously, so as to reduce comprehensive energy consumption.
Description
Technical field：
It the utility model is related to machinery equipment field, more particularly to a kind of double condensation stream backed expansion nitrogen making machines of double tower.
Background technology：
With economic development, science and technology research and development civilian industry, gas industry and cryogenic technique are all be unable to do without, during the whole world is particularly
The economic growth of state, have an optimistic view of air separation market prospects, situation optimism.The hair of the industry such as petrochemical industry, electronics, chemical fibre, polysilicon
It is more and more that exhibition needs High Purity Nitrogen to make leave with rage.The equipment of making nitrogen belongs to the energy-conserving and environment-protective category that country encourages development.
The chemical property torpescence of nitrogen, there is very big inertia in the state of usually, it is not easy to occur with other materials
Chemical reaction.Therefore, nitrogen is widely used in glass, oil refining, metallurgy, electronics, chemical industry as protection gas, and it is applied
Prospect is boundless, is a kind of burgeoning industrial gasses of demand.
With the extensive use of nitrogen, to the demand of High Purity Nitrogen also more and more higher, as number of patent application is
The technical scheme provided in the patent document of " ZL201020297154.9 " uses its air-separating technology flow, mainly provides
It is the product that nitrogen pressure is 1-3barg, when product nitrogen gas pressure often needs to improve 0.1barg, then air compressor machine pressure at expulsion needs
It is corresponding to improve 0.2barg.If user needs the product that nitrogen pressure is 3-4barg, the empty contractive pressure of bigger pressure is needed to contract
Machine, the energy consumption of air compressor are consequently increased, therefore process air capacity increase, and comprehensive energy consumption is consequently increased.
Utility model content：
The utility model aims to solve the problem that above mentioned problem, there is provided a kind of double condensation stream backed expansion nitrogen making machines of double tower.
To reach above-mentioned purpose, technical scheme is as follows used by the utility model：
A kind of double condensation stream backed expansion nitrogen making machines of double tower, including the air inlet pretreatment unit and system interconnected by pipeline
Nitrogen device, wherein：
The air inlet pretreatment unit includes passing sequentially through the air filtration for removing dust and mechanical admixture of pipeline connection
Device, the air compressor for being compressed extraneous air, to the Precooling unit that is cooled down of air of air compressor output with
And the purifier of purification Precooling unit delivery air；
The nitrogen-making device includes the main heat exchanger for heat exchange, subcooler, rectifying column, main condenser evaporator and master
Condenser/evaporator by the auxiliary condenser/evaporator and expanding machine of pipeline connection, wherein：
The rectifying column includes interconnected Xia Ta, upper tower, main condenser evaporator be located between Xia Ta and upper tower and with
Upper tower connection；
The lower tower be provided with for air enter air intake, the air intake by pipeline and by main heat exchanger with it is pure
Change device connection；
The Xia Ta, upper tower are respectively equipped with the first backflow liquid nitrogen entrance, the second backflow liquid nitrogen entrance；The main condenser evaporation
Device, auxiliary condenser/evaporator are respectively equipped with the outlet of the first liquid nitrogen, the outlet of the second liquid nitrogen；The lower top of tower is additionally provided with for after separation
The first gas nitrogen outlet of gas nitrogen discharge, the first gas nitrogen is provided with two pipelines, wherein a pipeline connects with main condenser evaporator；Separately
One pipeline connects with auxiliary condenser/evaporator；The of pipeline and the auxiliary condenser/evaporator of the first liquid nitrogen outlet of main condenser evaporator
The pipeline of two liquid nitrogen outlet converges to form liquid nitrogen pooling zone；Liquid nitrogen pooling zone is provided with two pipelines, wherein a pipeline passed through
Cooler connects with the second backflow liquid nitrogen entrance, and another pipeline connects with the first backflow liquid nitrogen entrance；
The lower tower bottom is additionally provided with the first oxygen-enriched liquid air outlet for oxygen-enriched liquid air outflow, and it is by pipeline and passes through
Cooler connects with the first oxygen-enriched liquid air entrance set on upper tower；
The upper top of tower is additionally provided with to be exported for the second gas nitrogen after secondary separation, and the second gas nitrogen outlet passes through pipeline simultaneously
Connected by subcooler, main heat exchanger with High Purity Nitrogen output end；
The second oxygen-enriched liquid air that the main condenser evaporator is additionally provided with for oxygen-enriched liquid air outflow exports, itself and auxiliary condensation evaporation
Device, main heat exchanger, expanding machine are sequentially communicated by pipeline；
The expanding machine is additionally provided with the outlet of the 3rd oxygen-enriched air, and it connects by pipeline and by main heat exchanger and purifier
It is logical, and it is provided with bypass regulator valve between passage after expander inlet and main heat exchanger expansion.
In further embodiment, main heat exchanger is additionally provided with the dirty nitrogen discharge pipe of dirty nitrogen output.
In further embodiment, the main condenser evaporator, auxiliary condenser/evaporator are provided with on-condensible gas discharge pipe.
In further embodiment, on the pipeline between the second backflow liquid nitrogen entrance set on the subcooler and upper tower
It is additionally provided with first throttle valve.
In further embodiment, on the pipeline between the first oxygen-enriched liquid air entrance set on the subcooler and upper tower
It is additionally provided with second throttle.
In further embodiment, the purifier includes molecular sieve adsorber and electric heater.
In further embodiment, the double condensation stream backed expansion nitrogen making machines of the double tower also include PLC remote monitoring systems.
In further embodiment, the double condensation stream backed expansion nitrogen making machines of the double tower include main condenser evaporator oxygen-enriched liquid air
The 3rd choke valve is additionally provided with pipeline between the second oxygen-enriched liquid air outlet of outflow and auxiliary condenser/evaporator entrance.
The double condensation stream backed expansion nitrogen making machines of double tower of the present utility model, are adsorbed using the full low-pressure molecular sieve with Precooling unit
Flow, effectively prevent moisture, carbon dioxide from entering Cryo Equipment in ice chest, operating pressure is low, securely and reliably；In addition using oxygen-enriched
Liquid air stepped evaporation in main condenser evaporator and auxiliary condenser/evaporator, realize and obtaining the high-purity gas nitrogen product of equal pressure
Under, condense stream backed expansion height with number of patent application for the conventional double tower list provided in the patent document of " ZL201020297154.9 "
Pure nitrogen making machine is compared, and can be reduced air compressor row pressure, be reduced power consumption, while can reduce processing air capacity, so as to reduce
Comprehensive energy consumption, environmental protection.
Brief description of the drawings
Form a part of accompanying drawing of the present utility model to be used for providing further understanding to of the present utility model, accompanying drawing is unexpectedly
Drawn to scale.In the accompanying drawings, each identical or approximately uniform part shown in each figure can be with identical
Label represent.For clarity, in each figure, not each part is labeled.Now, will be by example simultaneously
The embodiment of various aspects of the present utility model is described in reference to the drawings, in the accompanying drawings：
Fig. 1 is the overall structure signal of the double condensation stream backed expansion nitrogen making machines of double tower of the one of embodiment of the utility model
Figure.
Fig. 2A is the double condensation stream backed expansion nitrogen making machines (air inlet pretreatment) of double tower of the one of embodiment of the utility model
Operation principle schematic diagram.
Fig. 2 B condense stream backed expansion nitrogen making machines (nitrogen processed and classification steaming for the double tower pair of the one of embodiment of the utility model
Tower oxygen-enriched liquid air on hair) operation principle schematic diagram.
Embodiment
In order to know more about technology contents of the present utility model, especially exemplified by specific embodiment and coordinate above-mentioned institute's accompanying drawings explanation such as
Under.
As shown in Fig. 1 combinations Fig. 2A, Fig. 2 B, the double condensation stream backed expansion nitrogen making machines of the double tower, including be mutually connected by pipeline
The air inlet pretreatment unit 1 and nitrogen-making device 2 connect.
Air inlet pretreatment unit 1 includes the air cleaner for removing dust and mechanical admixture for passing sequentially through pipeline connection
11st, the precooler for being cooled down air compressor 12 that extraneous air is compressed, the air exported to air compressor 12
Group 13 and the purifier 14 for purifying the delivery air of Precooling unit 13.In this way, it is cold into master to reduce raw material objectionable impurities as far as possible
Solidifying evaporator 24, auxiliary condenser/evaporator 25.
In the present embodiment, using the full low-pressure molecular sieve adsorption process with Precooling unit 13, moisture, dioxy are effectively prevented
Change carbon and enter Cryo Equipment in ice chest, operating pressure is low, securely and reliably.
Nitrogen-making device 2 includes the main heat exchanger 21 for heat exchange, subcooler 26, rectifying for cooling and/or re-heat
Tower, main condenser evaporator 24, the auxiliary condenser/evaporator 25 and expanding machine 27 for passing through pipeline connection with main condenser evaporator 24.
Rectifying column includes interconnected lower tower 22, upper tower 23, main condenser evaporator 24 located at lower tower 22 and upper tower 23 it
Between and connect with upper tower 23.In the present embodiment, upper tower 23, lower tower 22 use the efficient convection current sieve plate of all-aluminium construction, tower plate structure
It is reasonable in design, and made using special process, the levelness of column plate is fully ensured that, plate efficiency is high, makes product nitrogen recovery rate high.
Lower tower 22 is provided with the air intake 221 entered for air, and the air intake 221 is by pipeline and passes through main heat exchanger
21 connect with purifier 14.
Lower tower 22, upper tower 23 are respectively equipped with the first backflow liquid nitrogen entrance 224, second backflow liquid nitrogen entrance 234；Main condenser steams
Hair device 24, auxiliary condenser/evaporator 25 are respectively equipped with the first liquid nitrogen and export the 241, second liquid nitrogen outlet 251；The lower top of tower 22 is additionally provided with
The the first gas nitrogen outlet 222 discharged for the gas nitrogen after separation, the first gas nitrogen is provided with two pipelines, wherein a pipeline and main condenser
Evaporator 24 connects；Another pipeline connects with auxiliary condenser/evaporator 25；The first liquid nitrogen outlet 241 of main condenser evaporator 24
Pipeline and the pipeline of the second liquid nitrogen outlet 251 of auxiliary condenser/evaporator 25 converge to form liquid nitrogen pooling zone 30；Liquid nitrogen pooling zone 30
Provided with two pipelines, wherein a pipeline connects by subcooler 26 with the second liquid nitrogen entrance 234 that flows back, another article of pipeline and the
One backflow liquid nitrogen entrance 224 connects.
The lower bottom of tower 22 is additionally provided with the first oxygen-enriched liquid air outlet 223 for oxygen-enriched liquid air outflow, and it is by pipeline and passes through
Subcooler 26 connects with the first oxygen-enriched liquid air entrance 231 set on upper tower 23.
The upper top of tower 23 is additionally provided with passes through pipe for the second gas nitrogen outlet 232 after secondary separation, the second gas nitrogen outlet 232
Road simultaneously connects by subcooler 26, main heat exchanger 21 with High Purity Nitrogen output end.
The main condenser evaporator 24 be additionally provided with for oxygen-enriched liquid air outflow the second oxygen-enriched liquid air outlet 233, its with it is auxiliary cold
Solidifying evaporator 25, main heat exchanger 21, expanding machine 27 are sequentially communicated by pipeline.Expanding machine 27 is additionally provided with the 3rd oxygen-enriched air and gone out
Mouthful, it is connected by pipeline and by main heat exchanger 21 with purifier 14, and the entrance of expanding machine 27 expands with main heat exchanger 21
Bypass regulator valve is provided between passage afterwards.
In this way, the upper bottom oxygen-enriched liquid air of tower 23 obtains needed for tower 23 rising after being evaporated in main condenser evaporator 24 is steamed
Gas；Unevaporated oxygen-enriched liquid air, which enters in auxiliary condenser/evaporator 25, to be evaporated.Oxygen-enriched liquid air steams in main condenser evaporator 24, auxiliary condensation
Stage evaporation in device 25 is sent out, under the premise of the lower tower overhead gas nitrogen condensation temperature identical of tower 22, main condenser evaporator 24 can be improved
Evaporating pressure, that is, improve the operating pressure of upper tower 23.Conversely, compared with the cold stream backed expansion flow of double tower list master, obtaining on an equal basis
Upper 23 nitrogen pressure of tower when, the operating pressure of lower tower 22 can be reduced, that is, reduce the row pressure of raw material air compressor machine, reach drop can save
The purpose of consumption.
Preferably, main heat exchanger 21 is additionally provided with the dirty nitrogen discharge pipe of dirty nitrogen output.
Preferably, main condenser evaporator 24, auxiliary condenser/evaporator 25 are provided with on-condensible gas discharge pipe.
In some preferred embodiments, to ensure the relatively stable of device operating mode, subcooler 26 on upper tower 23 with setting
The second backflow liquid nitrogen entrance 234 between pipeline on be additionally provided with first throttle valve 28；Subcooler 26 on upper tower 23 with setting
The first oxygen-enriched liquid air entrance 231 between pipeline on be additionally provided with second throttle 29；The oxygen-enriched liquid air of main condenser evaporator 24
The 3rd choke valve is additionally provided with pipeline between the second oxygen-enriched liquid air outlet 233 of outflow and the entrance of auxiliary condenser/evaporator 25.
In the present embodiment, first throttle valve 28, second throttle 29, the 3rd choke valve are using special low temperature resistant in air separation cooling box
And possesses the pneumatic operated valve of well-tuned performance.
In certain embodiments, as shown in figure 1, purifier 14 includes molecular sieve adsorber and electric heater 141.Molecular sieve
Absorber selects long period molecular sieve adsorber, using advanced airflow distribution device and structure, simple and reliable anti-bias current dress
Put so that bed structure is simple, reliable；For electric heater 141 using unique vertical bar-shaped design, fault rate is low, is convenient for changing.
Preferably, to reduce labor strength, the double condensation stream backed expansion nitrogen making machines of double tower also include PLC remote monitorings system
System.
As shown in Fig. 1 combinations Fig. 2A, Fig. 2 B, in the present embodiment, the nitrogen side processed of the double condensation stream backed expansion nitrogen making machines of double tower
Method includes：
Step 1, air inlet pretreatment：
Raw air removes dust and mechanical admixture through air cleaner 11, is then compressed in air compressor 12
Required setting pressure, the pre-cooled unit 13 of compressed air are cooled down, and water, two are removed subsequently into the purifier 14 of automatic switchover
Carbonoxide and acetylene and other hydrocarbons, the air themperature for going out purifier 14 are 20 DEG C；
The air for going out purifier 14 is divided into two parts：Part I air passes through main heat exchanger 21 and the gas converting heat that backflows,
Condensing temperature is cooled to, entering lower tower 22 by air intake 221 participates in air separation；It is double that Part II air enters double tower
The instrument air system of stream backed expansion nitrogen making machine is condensed as instrument supply gas and blanket gas.
Step 2, nitrogen processed：
Air enters lower tower 22 by air intake 221 and participates in air separation；Air in lower tower 22 by initial gross separation into
Nitrogen and oxygen-enriched liquid air；
Tower top in lower tower 22 obtains purity nitrogen, and gas nitrogen is divided into two-way from the discharge of the first gas nitrogen outlet 222：It is cold by master all the way
Solidifying evaporator 24 is condensed into liquid nitrogen from the outflow of the first liquid nitrogen outlet 241, another way by auxiliary condenser/evaporator 25 be condensed into liquid nitrogen from
The outflow of second liquid nitrogen outlet 251；Two-way liquid nitrogen converges in liquid nitrogen pooling zone 30, and the liquid nitrogen after converging is divided into two parts：First
Liquid separation nitrogen is injected to the upper top of tower 23 again after the cooling of subcooler 26 and after the decompression of first throttle valve 28；As upper tower 23
Phegma；Part II liquid nitrogen returns to lower tower 22 and is used as phegma；
The oxygen-enriched liquid air of the lower bottom of tower 22 is subcooled and by the from the outflow of the first oxygen-enriched liquid air outlet 223 through subcooler 26
Upper tower 23 is entered by the first oxygen-enriched liquid air entrance 231 after two choke valves 29 regulation pressure, as the upper raw material of tower 23；
The pure gas nitrogen that the upper oxygen-enriched liquid air of tower 23 obtains after secondary separation passes through from the discharge of the second gas nitrogen outlet 232, gas nitrogen
The re-heat of cooler 26, main heat exchanger 21 are exported to High Purity Nitrogen output end after exchanging heat.
Tower oxygen-enriched liquid air in step 3, stage evaporation：
The oxygen-enriched liquid air of the upper bottom of tower 23, which enters in main condenser evaporator 24, to be evaporated, and is divided into two parts：Part I
Upflowing vapor of the oxygen-enriched air as upper tower 23；
The Part II oxygen-enriched liquid air not evaporated enters auxiliary condensation by the outflow of the second oxygen-enriched liquid air outlet 233, decompression
Flash to oxygen-enriched air in evaporator 25, oxygen-enriched air through the re-heat of main heat exchanger 21, expanded into expanding machine 27 and produce expansion
Machine 27 runs institute's chilling requirement, and the oxygen-enriched air after expansion is divided into two parts：
Part I oxygen-enriched air after expansion is exported by the 3rd oxygen-enriched liquid air to flow out, into after the re-heat of main heat exchanger 21
Purifier 14 is sent into use as regeneration gas；
Part II oxygen-enriched air after expansion is emitted into outside the double condensation stream backed expansion nitrogen making machines of double tower.
In the present embodiment, whole set process flow is calculated using international advanced ASPEN softwares simulation, emulated, the software
Through handling the domestic and international stable parametric regression of tens of sets about technical staff, to ensure to simulate result of calculation and actual fortune
Capable parameter is coincide.
Backflowed with number of patent application for the conventional double tower list condensation provided in the patent document of " ZL201020297154.9 "
Expand high-purity nitrogen making machine to compare, prior art mainly provides nitrogen pressure 1-3barg product, when product nitrogen gas pressure is every
Improving 0.1barg, then air compressor machine pressure at expulsion need to accordingly improve 0.2barg.After the technical scheme after the utility model, when
Product nitrogen gas pressure often improves 0.1barg, and then air compressor machine pressure at expulsion need to accordingly improve 0.12barg, can substantially save.
The utility model adds auxiliary condenser/evaporator 25, using the oxygen-enriched liquid air of upper tower 23 in main condenser evaporator 24 and
The principle of stepped evaporation in auxiliary condenser/evaporator 25, under the conditions of the discharge capacity of identical air compressor 12, row pressure, product nitrogen gas
Pressure can improve 0.5barg；It should be appreciated that under identical product nitrogen gas pressure condition, the row pressure of air compressor 12 can drop
Low 1.5barg.Air compressor 12 can reduce power consumption 7-10%, and energy-saving effect is obvious.For example user needs 3500Nm3/h-
3.2barg high pure nitrogen, the flow of the conventional double tower list condensation high-purity nitrogen making machine of stream backed expansion need to use 6300Nm3/h-9.5barg
Air compressor machine, be 6000Nm using air compressor machine after after this nitrogen making machine3/h-8barg。
Further, user needs 3500Nm3/ h-3.2barg high pure nitrogen, if returned using conventional single column list condensation
Stream expands the method for preparing nitrogen of high-purity nitrogen making machine, need to use 7500Nm3The air compressor machine of/h-4.8barg row pressures, the nitrogen processed with this nitrogen making machine
Method compares, the energy consumption of the increase of air compressor 12 2.2%, because of processing air capacity increase, comprehensive energy consumption increase by 3%.
So as to the double condensation stream backed expansion nitrogen making machines of double tower of the present utility model, using the full low pressure with Precooling unit 13 point
Son sieve adsorption process, effectively prevents moisture, carbon dioxide from entering Cryo Equipment in ice chest, operating pressure is low, securely and reliably；In addition
Using oxygen-enriched liquid air in main condenser evaporator 24 and auxiliary condenser/evaporator 25 stepped evaporation, realize obtain equal pressure height
Under pure gas nitrogen product, condensed with number of patent application for the conventional double tower list provided in the patent document of " ZL201020297154.9 "
The high-purity nitrogen making machine of stream backed expansion is compared, and can be reduced the row pressure of air compressor 12, be reduced power consumption, while can reduce processing air
Amount, so as to reduce comprehensive energy consumption, environmental protection.
Although the utility model is disclosed above with preferred embodiment, so it is not limited to the utility model.This reality
With new those of ordinary skill in the art, do not departing from spirit and scope of the present utility model, it is each when that can make
The change and retouching of kind.Therefore, the scope of protection of the utility model is worked as and is defined depending on those as defined in claim.
Claims (8)
1. the double condensation stream backed expansion nitrogen making machines of a kind of double tower, it is characterised in that the air inlet including being interconnected by pipeline is located in advance
Device and nitrogen-making device are managed, wherein：
The air inlet pretreatment unit includes passing sequentially through the air cleaner for removing dust and mechanical admixture of pipeline connection, incited somebody to action
The Precooling unit and purification that air compressor that extraneous air is compressed, the air to air compressor output are cooled down
The purifier of Precooling unit delivery air；
The nitrogen-making device includes main heat exchanger, subcooler, rectifying column, main condenser evaporator and the main condenser for heat exchange
Evaporator by the auxiliary condenser/evaporator and expanding machine of pipeline connection, wherein：
The rectifying column includes interconnected Xia Ta, upper tower, main condenser evaporator be located between Xia Ta and upper tower and with upper tower
Connection；
The lower tower is provided with the air intake entered for air, and the air intake is by pipeline and passes through main heat exchanger and purifier
Connection；
The Xia Ta, upper tower are respectively equipped with the first backflow liquid nitrogen entrance, the second backflow liquid nitrogen entrance；The main condenser evaporator,
Auxiliary condenser/evaporator is respectively equipped with the outlet of the first liquid nitrogen, the outlet of the second liquid nitrogen；The lower top of tower is additionally provided with for the gas after separation
The first gas nitrogen outlet of nitrogen discharge, the first gas nitrogen is provided with two pipelines, wherein a pipeline connects with main condenser evaporator；It is another
Bar pipeline connects with auxiliary condenser/evaporator；The pipeline and the second of auxiliary condenser/evaporator of the first liquid nitrogen outlet of main condenser evaporator
The pipeline of liquid nitrogen outlet converges to form liquid nitrogen pooling zone；Liquid nitrogen pooling zone is provided with two pipelines, wherein a pipeline is by supercooling
Device connects with the second backflow liquid nitrogen entrance, and another pipeline connects with the first backflow liquid nitrogen entrance；
The lower tower bottom is additionally provided with the first oxygen-enriched liquid air outlet for oxygen-enriched liquid air outflow, and it is by pipeline and passes through subcooler
Connected with the first oxygen-enriched liquid air entrance set on upper tower；
The upper top of tower is additionally provided with to be exported for the second gas nitrogen after secondary separation, and the second gas nitrogen outlet is by pipeline and passes through
Subcooler, main heat exchanger connect with High Purity Nitrogen output end；
The second oxygen-enriched liquid air that the main condenser evaporator is additionally provided with for oxygen-enriched liquid air outflow exports, its with auxiliary condenser/evaporator,
Main heat exchanger, expanding machine are sequentially communicated by pipeline；
The expanding machine is additionally provided with the outlet of the 3rd oxygen-enriched air, and it is connected by pipeline and by main heat exchanger with purifier,
And it is provided with bypass regulator valve between passage after expander inlet and main heat exchanger expansion.
2. the double condensation stream backed expansion nitrogen making machines of double tower according to claim 1, it is characterised in that main heat exchanger is additionally provided with
The dirty nitrogen discharge pipe of dirty nitrogen output.
3. the double condensation stream backed expansion nitrogen making machines of double tower according to claim 1, it is characterised in that the main condenser evaporation
Device, auxiliary condenser/evaporator are provided with on-condensible gas discharge pipe.
4. the double condensation stream backed expansion nitrogen making machines of double tower according to claim 1, it is characterised in that the subcooler and upper tower
First throttle valve is additionally provided with pipeline between second backflow liquid nitrogen entrance of upper setting.
5. the double condensation stream backed expansion nitrogen making machines of double tower according to claim 1, it is characterised in that the subcooler and upper tower
Second throttle is additionally provided with pipeline between first oxygen-enriched liquid air entrance of upper setting.
6. the double condensation stream backed expansion nitrogen making machines of double tower according to claim 1, it is characterised in that the purifier includes dividing
Son sieve absorber and electric heater.
7. the double condensation stream backed expansion nitrogen making machines of double tower according to claim 1, it is characterised in that the double condensations of the double tower are returned
Stream expansion nitrogen making machine also includes PLC remote monitoring systems.
8. the double condensation stream backed expansion nitrogen making machines of double tower according to claim 1, it is characterised in that the main condenser evaporator
The 3rd throttling is additionally provided with pipeline between the second oxygen-enriched liquid air outlet of oxygen-enriched liquid air outflow and auxiliary condenser/evaporator entrance
Valve.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107345737A (en) * | 2017-06-08 | 2017-11-14 | 苏州制氧机股份有限公司 | The double condensation stream backed expansion nitrogen making machines of double tower and its method for preparing nitrogen |
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2017
- 2017-06-08 CN CN201720658797.3U patent/CN206847223U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107345737A (en) * | 2017-06-08 | 2017-11-14 | 苏州制氧机股份有限公司 | The double condensation stream backed expansion nitrogen making machines of double tower and its method for preparing nitrogen |
| CN107345737B (en) * | 2017-06-08 | 2023-09-19 | 苏州制氧机股份有限公司 | Double-tower double-condensation reflux expansion nitrogen making machine and nitrogen making method thereof |
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