CN108387068A - Stream backed expansion nitrogen making machine is pressurized after oxygen-enriched - Google Patents
Stream backed expansion nitrogen making machine is pressurized after oxygen-enriched Download PDFInfo
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- CN108387068A CN108387068A CN201710749120.5A CN201710749120A CN108387068A CN 108387068 A CN108387068 A CN 108387068A CN 201710749120 A CN201710749120 A CN 201710749120A CN 108387068 A CN108387068 A CN 108387068A
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- oxygen
- air
- purifier
- enriched
- making machine
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 113
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 55
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000001301 oxygen Substances 0.000 title claims abstract description 52
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 52
- 239000007789 gas Substances 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 230000008929 regeneration Effects 0.000 claims abstract description 11
- 238000011069 regeneration method Methods 0.000 claims abstract description 11
- 238000004140 cleaning Methods 0.000 claims abstract description 9
- 238000009833 condensation Methods 0.000 claims abstract description 7
- 230000005494 condensation Effects 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000005485 electric heating Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 3
- 238000009827 uniform distribution Methods 0.000 claims description 3
- 239000004215 Carbon black (E152) Substances 0.000 claims description 2
- 229930195733 hydrocarbon Natural products 0.000 claims description 2
- 150000002430 hydrocarbons Chemical class 0.000 claims description 2
- 239000003570 air Substances 0.000 claims 1
- 238000001914 filtration Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 3
- 239000002808 molecular sieve Substances 0.000 description 5
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002595 cold damage Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- 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
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04012—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
- F25J3/04036—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of oxygen
-
- 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
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04109—Arrangements of compressors and /or their drivers
-
- 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
- F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
- F25J3/04163—Hot end purification of the feed air
- F25J3/04169—Hot end purification of the feed air by adsorption of the 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
- 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
- F25J3/04624—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 integrated mass and heat exchange, so-called non-adiabatic rectification, e.g. dephlegmator, reflux exchanger
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention discloses a kind of oxygen-enriched rear supercharging stream backed expansion nitrogen making machines, including self-cleaning air filter;Raw air is compressed after self-cleaning air filter removes impurity by air compressor, then after the precooling of pre-cooled machine, into purifier；Enter fractionating column after being adsorbed in purifier;Then air is exchanged heat through main heat exchanger and the oxygen rich air backflowed and nitrogen in fractionating column and enters rectifying column after being cooled to saturation temperature, and high-purity nitrogen is obtained at the top of rectifying column；The some of this strand of high-purity nitrogen is sent as product to user；Another condensed evaporator condensation liquefaction of part, some of gained liquid nitrogen make phegma；Oxygen-enriched liquid air evaporates in condenser/evaporator and through main heat exchanger re-heat, is then expanded in booster expansion turbine；Oxygen rich air after expansion goes out fractionating column after main heat exchanger re-heat to room temperature, and a portion heats the regeneration gas as purifier through electric heater；Low energy consumption by the present invention, and energy-saving effect is apparent.
Description
Technical field
The present invention relates to a kind of improvement of High Purity Nitrogen device, refer in particular to a kind of oxygen-enriched rear supercharging stream backed expansion nitrogen that low energy consumption
Machine.
Background technology
The chemical property torpescence of nitrogen has prodigious inertia, it is not easy to occur with other materials in the state of usually
Chemical reaction.Therefore, nitrogen is widely used in glass, oil refining, metallurgy, electronics, chemical industry as protection gas, application
Foreground is boundless.
Chinese patent 201010257166.3 discloses a kind of high-purity nitrogen plant, including pretreatment system, purification system and
Fractionating column, the fractionating column include turbo-expander, for the main heat exchanger and subcooler and rectifying column of heat exchange and condensation
Evaporator, the rectifying column include Shang Ta and lower tower, and the outlet of the purification system is connected to the air intake of lower tower by the road,
The pipeline passes through main heat exchanger；The lower tower is additionally provided with the oxygen-enriched liquid air outlet of the outflow of the oxygen-enriched liquid air for being generated for rectifying,
The oxygen-enriched liquid air outlet is connected to the purification system by the road, which passes through main heat exchanger；The upper tower is equipped with nitrogen
The pipeline of outlet, outlet connection passes through main heat exchanger.The present invention is by by the pipeline of oxygen-enriched pipeline, raw air, nitrogen
Pipeline be connected to main heat exchanger simultaneously so that oxygen-enriched and nitrogen cold is fully used, energy conservation and environmental protection；It simultaneously will be oxygen-enriched
Expanding machine is sent into freeze, it is reasonable for structure, material is saved, flow configuration is simple.But regeneration gas is into purifying in the technical solution
The temperature of system is 17 DEG C or so, then is regenerated into absorbing cylinder to molecular sieve after electric heater is heated to 200 DEG C, the party
The energy consumption of case is higher.
For this purpose, we have developed a kind of oxygen-enriched rear supercharging stream backed expansion nitrogen making machine that low energy consumption.
Invention content
There is provided the invention aims to overcome the deficiencies in the prior art it is a kind of low energy consumption it is oxygen-enriched after supercharging backflow it is swollen
Swollen nitrogen making machine.
In order to achieve the above objectives, the technical solution adopted by the present invention is：Stream backed expansion nitrogen making machine is pressurized after oxygen-enriched, including self-cleaning
Air filter;Raw air is compressed to required pressure after self-cleaning air filter removes impurity by air compressor,
After pre-cooled machine precooling, into purifier；Moisture, carbon dioxide, nytron in raw air are fallen in absorption in purifier
Enter fractionating column after object;Then air is exchanged heat with the oxygen rich air and nitrogen backflowed through main heat exchanger in fractionating column and is cooled down
Enter rectifying column after to saturation temperature and carry out rectifying, high-purity nitrogen is obtained at the top of rectifying column；This strand of high-purity nitrogen one
Part is used as product nitrogen gas, goes out fractionating column after main heat exchanger re-heat, send to user；Another condensed evaporator condensation liquid of part
Change, for some of gained liquid nitrogen as output of products, another part makees phegma back into tower；The low-temperature receiver of condenser/evaporator is to lean on
A part of oxygen-enriched liquid air is extracted from the bottom of tower of rectifying column to cool down through subcooler, is evaporated in condenser/evaporator to provide after throttling；
Oxygen-enriched liquid air evaporates in condenser/evaporator and through main heat exchanger re-heat, is then expanded into close to air in booster expansion turbine
It presses, the cold needed for generation device；Oxygen rich air after expansion goes out fractionating column after main heat exchanger re-heat to room temperature and is divided into two
Point, after a part enters the pressurized end heating of expanding machine, then the regeneration gas through electric heater heating as purifier；Another part
Enter muffler emptying when purifier is in the heating period；When purifier is in the cold blowing stage as the cold blowing of purifier
Gas.
Preferably, the booster expansion turbine is gas bearing supercharging turboexpander.
Preferably, the precooler is additionally provided with automatic water trap.
Preferably, the purifier is provided with air-flow uniform distribution device.
Preferably, the electric heating tube uses the straight bar type of stainless steel.
Preferably, the outlet of the purifier is provided with dust filter unit.
Preferably, the regeneration heating tolerance of the purifier is equipped with interlock with electric heating tube, and tolerance is less than setting value
Auto-cutout is protected, automatic higher than setting to restore.
Preferably, two groups of controls of the power of the electric heating tube point are set when the outlet temperature of electric heating tube is below or above
Determine parameter, be automatically stopped or start.
Preferably, it is described it is oxygen-enriched after in supercharging stream backed expansion nitrogen making machine 95% or more cold by booster expansion turbine
It provides.
Preferably, the main heat exchanger uses Long plate type heat exchanger, makes warm end temperature difference control less than 3 DEG C.
Due to the application of the above technical scheme, the present invention has following advantages compared with prior art：
Oxygen-enriched rear supercharging stream backed expansion nitrogen making machine of the present invention increases on the basis of conventional single column backflows nitrogen producing procedure
Be pressurized after oxygen rich air, i.e., the oxygen rich air of cooling box by booster expansion turbine ET pressurized end supercharging after as purifier again
The inlet temperature of anger, regeneration gas into electric heater EH is improved by 17 DEG C to 50 DEG C or so, can substantially reduce electric heater EH's
Power, energy-saving effect are apparent.
Description of the drawings
Technical scheme of the present invention is further explained below in conjunction with the accompanying drawings：
Attached drawing 1 is the fundamental diagram of oxygen-enriched rear supercharging stream backed expansion nitrogen making machine of the present invention.
Wherein：AF, self-cleaning air filter；TC, air compressor；UF, precooler；PPU, purifier；EH, electrical heating
Device；SL, muffler；CB, fractionating column；E1, main heat exchanger；E2, subcooler；K, condenser/evaporator；ET, booster expansion turbine；
C, rectifying column.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment, the present invention is described in further details.
Attached drawing 1 is oxygen-enriched rear supercharging stream backed expansion nitrogen making machine of the present invention, including self-cleaning air filter AF;It is former
Material air is compressed to required pressure, pre-cooled machine UF after self-cleaning air filter AF removes impurity by air compressor TC
After precooling, into purifier PPU；Moisture, carbon dioxide, hydrocarbon in raw air are fallen in absorption in purifier PPU
Enter fractionating column CB afterwards;Then air exchanged heat through main heat exchanger E1 and the oxygen rich air backflowed and nitrogen in fractionating column CB and
Enter rectifying column C progress rectifying after being cooled to saturation temperature, high-purity nitrogen is obtained at the top of rectifying column C；This burst of high-purity
Nitrogen some goes out fractionating column CB after main heat exchanger E1 re-heats, send to user as product nitrogen gas；Another condensed steaming of part
Device K condensation liquefactions are sent out, for some of gained liquid nitrogen as output of products, another part makees phegma back into tower；Condensation evaporation
The low-temperature receiver of device K is cooled down through subcooler E2 by extracting a part of oxygen-enriched liquid air from the bottom of tower of rectifying column C, in condensation evaporation after throttling
It is evaporated in device K to provide；Oxygen-enriched liquid air evaporates in condenser/evaporator K and through main heat exchanger E1 re-heat, then in turbine boosting
Expanding machine ET is expanded into close to atmospheric pressure, the cold needed for generation device；Oxygen rich air after expansion through main heat exchanger E1 re-heats extremely
It is two parts to go out fractionating column CB points after room temperature, and a part adds into after the pressurized end heating of expanding machine ET, then through electric heater EH
Regeneration gas of the heat as purifier PPU；Another part enters muffler SL emptying when purifier PPU is in the heating period；When
As the cold blowing gas of purifier PPU when purifier PPU is in the cold blowing stage.
In the present embodiment, the booster expansion turbine ET is gas bearing supercharging turboexpander.
Precooler UF in the present embodiment uses full low-pressure molecular sieve adsorption process, effectively prevent moisture, carbon dioxide into
Enter Cryo Equipment in ice chest, operating pressure is low, securely and reliably.
Precooler UF described in the present embodiment uses overall skid-mounted pattern, compact-sized, easy for installation, aesthetic in appearance, and
And air can be sufficiently separated and go out the moisture after precooler, it is ensured that no water droplet enters molecular sieve purifier, extends making for molecular sieve
Use the service life.
Precooler UF described in the present embodiment is additionally provided with warning device and interlock protection device, keeps operation more reliable.
The compressor regulative mode of precooler UF described in the present embodiment uses automated manner, can be according to the demand to cold
Automatic realize is adjusted, while the mating cold micro-tensioning systems of precooler UF, variation that can be according to atmospheric temperature and processing gas
The variation of amount is adjusted, and ensures good operation of the unit under multi-state.
Precooler UF described in the present embodiment is additionally provided with automatic water trap, simple, reliable.
Purifier PPU described in the present embodiment is that molecular sieve purifier uses purifier PPU using " bunk beds " structure
Air in CO2Content is≤1PPm, H2O content dew points at normal pressure≤- 70 DEG C.
Purifier PPU described in the present embodiment is provided with air-flow uniform distribution device, and long lifespan reduces investment outlay, reduces energy
Consumption.
The equalizing valve of purifier PPU described in the present embodiment uses regulation ball valve, and pressure switch, realization is coordinated to be cut without impact
It changes.
Purifier PPU described in the present embodiment uses novel sealing structure butterfly valve, walks accurate, long lifespan, good reliability.
Electric heating tube EH described in the present embodiment uses the straight bar type of stainless steel, and failure rate is low, and convenient disassembly works as electric heating tube
It single can be extracted when EH failures, facilitate and replaced.
The outlet of purifier PPU is provided with dust filter unit, and dust is effectively prevent to enter lower tower, ensures that air separation plant is long-term
Stable operation.
Regeneration heating tolerance and the electric heating tube EH of purifier PPU is equipped with interlock, and tolerance is less than setting value from dynamic circuit breaker
Road is protected, automatic higher than setting to restore.
Point two groups of controls of the power of electric heating tube EH, when the outlet temperature of electric heating tube EH is below or above setup parameter,
It is automatically stopped or starts.
The rectifying column C uses the efficient convection current sieve plate of all-aluminium construction, fully ensures that the levelness of column plate, and plate efficiency is high,
Keep product nitrogen recovery rate high.
95% or more cold is by booster expansion turbine ET in oxygen-enriched rear supercharging stream backed expansion nitrogen making machine of the present invention
It provides, using gas lubrication, efficient three-dimensional flow active wheel, booster expansion turbine ET is stable for bearing lubrication, operation repair
Convenient, booster expansion turbine ET adiabatic efficiencies are high.Rotor and bearing can directly be replaced from room temperature end, be not required to take off pearly-lustre
Sand, it is easy to maintain.
The design of booster expansion turbine ET supply air lines meets user in the case where not stopping and do not switch turbo-expander
Filter can be arbitrarily replaced, filter is fabricated using stainless steel.
In the present embodiment, raw material objectionable impurities is reduced as far as possible and enters condenser/evaporator K.
The condenser/evaporator K is equipped with ground structure, prevents electrostatic.
The condenser/evaporator K uses unique blast resistance construction, prevents the accumulation in the fin of the impurity such as CnHm and NO2.
Oxygen-enriched rear supercharging stream backed expansion nitrogen making machine of the present invention uses PLC fully automatic systems, reduces worker's labour by force
Degree；Also use the observing and controlling component such as regulating valve, in-line analyzer；In addition to ensuring that outside the normal operation of equipment, it can also be in equipment
Occur providing following safeguard measure when disastershutdown：The abort situation of all control valves is in the position of a safety, ensures
Equipment safety.
The ice chest interior conduit of the precooler UF carries out stress analysis, and pipe arrangement uses self compensation form, uses aluminium
Alloy material.
The main heat exchanger E1 uses Long plate type heat exchanger, and warm end temperature difference control is made less than 3 DEG C, to reduce cold damage
It loses, reduces energy consumption.
Vavle shelf, pipe support, cold box equipment suspension and support in the ice chest of the precooler UF are all made of stainless steel, increase strong
Degree improves reliability, reduces thermal conductivity.
Meanwhile the oxygen-enriched rear supercharging stream backed expansion nitrogen making machine described in the present embodiment is expanded using oxygen rich air through turbine boosting
The principle of the pressurized end supercharging heating of machine ET, backflows under the premise of product gas nitrogen uniform pressure same traffic with conventional single column swollen
Swollen High Purity Nitrogen flow compares the power that can reduce electric heater, reduces power consumption.
The temperature of regeneration gas will be promoted to 50 DEG C in the present embodiment, can reduce the power of electric heater, hence it is evident that energy saving.Experiment
Showing user needs the high pure nitrogen of 3000Nm3/h-3.5barg, and conventional single column flow of backflowing need to use the electric heater of 120KW, answer
It is 90KW with electric heater capacity after this flow, the comprehensive energy consumption of package unit reduces ~ 2.1%.
Due to the application of the above technical scheme, the present invention has following advantages compared with prior art：
Oxygen-enriched rear supercharging stream backed expansion nitrogen making machine of the present invention increases on the basis of conventional single column backflows nitrogen producing procedure
Be pressurized after oxygen rich air, i.e., the oxygen rich air of cooling box by booster expansion turbine ET pressurized end supercharging after as purifier again
The inlet temperature of anger, regeneration gas into electric heater EH is improved by 17 DEG C to 50 DEG C or so, can substantially reduce electric heater EH's
Power, energy-saving effect are apparent.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and be implemented, and it is not intended to limit the scope of the present invention, all according to the present invention
Equivalent change or modification made by Spirit Essence should all cover within the scope of the present invention.
Claims (10)
1. stream backed expansion nitrogen making machine is pressurized after oxygen-enriched, including self-cleaning air filter;Raw air is through self-cleaning type air filtration
Device is compressed to required pressure by air compressor after removing impurity, after pre-cooled machine precooling, into purifier；In purifier
Enter fractionating column after adsorbing the moisture in raw air, carbon dioxide, hydrocarbon;Then air in fractionating column through master
Heat exchanger and the oxygen rich air backflowed and nitrogen are exchanged heat and are cooled to after saturation temperature into rectifying column and carry out rectifying, in rectifying
High-purity nitrogen is obtained at the top of tower；This burst of high-purity nitrogen some goes out to divide as product nitrogen gas after main heat exchanger re-heat
Tower is evaporated, is sent to user；Another condensed evaporator condensation liquefaction of part, some of gained liquid nitrogen are another as output of products
Part makees phegma back into tower；The low-temperature receiver of condenser/evaporator is passed through by extracting a part of oxygen-enriched liquid air from the bottom of tower of rectifying column
Cooler cools down, and is evaporated in condenser/evaporator to provide after throttling；It is characterized in that：Oxygen-enriched liquid air evaporates in condenser/evaporator
And through main heat exchanger re-heat, then it is expanded into close to atmospheric pressure in booster expansion turbine, the cold needed for generation device；It is swollen
Oxygen rich air after swollen goes out fractionating column after main heat exchanger re-heat to room temperature and is divided into two parts, and a part enters the pressurized end of expanding machine
After heating, then the regeneration gas through electric heater heating as purifier；Another part enters when purifier is in the heating period
Muffler is vented；When purifier is in the cold blowing stage as the cold blowing gas of purifier.
2. oxygen-enriched rear supercharging stream backed expansion nitrogen making machine according to claim 1, it is characterised in that：The turbine boosting expansion
Machine is gas bearing supercharging turboexpander.
3. oxygen-enriched rear supercharging stream backed expansion nitrogen making machine according to claim 1, it is characterised in that：The precooler is also set
It is equipped with automatic water trap.
4. oxygen-enriched rear supercharging stream backed expansion nitrogen making machine according to claim 1, it is characterised in that：The purifier setting
There is air-flow uniform distribution device.
5. oxygen-enriched rear supercharging stream backed expansion nitrogen making machine according to claim 1, it is characterised in that：The electric heating tube EH
Using the straight bar type of stainless steel.
6. oxygen-enriched rear supercharging stream backed expansion nitrogen making machine according to claim 1, it is characterised in that：The outlet of the purifier
It is provided with dust filter unit.
7. oxygen-enriched rear supercharging stream backed expansion nitrogen making machine according to claim 1, it is characterised in that：The regeneration of the purifier
It heats tolerance and is equipped with interlock with electric heating tube, tolerance is protected less than setting value auto-cutout, automatic higher than setting to restore.
8. oxygen-enriched rear supercharging stream backed expansion nitrogen making machine according to claim 1, it is characterised in that：The work(of the electric heating tube
Rate point two groups of controls are automatically stopped or are started when the outlet temperature of electric heating tube is below or above setup parameter.
9. oxygen-enriched rear supercharging stream backed expansion nitrogen making machine according to claim 1, it is characterised in that：The oxygen-enriched rear supercharging
95% or more cold is provided by booster expansion turbine in stream backed expansion nitrogen making machine.
10. oxygen-enriched rear supercharging stream backed expansion nitrogen making machine according to claim 1, it is characterised in that：The main heat exchanger is adopted
With Long plate type heat exchanger, make warm end temperature difference control less than 3 DEG C.
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