CN108240734B - Air supply system of booster expander and air separation equipment - Google Patents
Air supply system of booster expander and air separation equipment Download PDFInfo
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- CN108240734B CN108240734B CN201810190863.8A CN201810190863A CN108240734B CN 108240734 B CN108240734 B CN 108240734B CN 201810190863 A CN201810190863 A CN 201810190863A CN 108240734 B CN108240734 B CN 108240734B
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- expander
- air
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- pipeline
- supply system
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- 238000000926 separation method Methods 0.000 title claims abstract description 28
- 230000001105 regulatory effect Effects 0.000 claims description 19
- 230000006835 compression Effects 0.000 claims description 14
- 238000007906 compression Methods 0.000 claims description 14
- 238000004887 air purification Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 5
- 239000002808 molecular sieve Substances 0.000 claims 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 claims description 5
- 238000012546 transfer Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 abstract description 12
- 239000007789 gas Substances 0.000 description 49
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 13
- 239000001301 oxygen Substances 0.000 description 13
- 229910052760 oxygen Inorganic materials 0.000 description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 12
- 230000000694 effects Effects 0.000 description 8
- 238000005057 refrigeration Methods 0.000 description 8
- 238000005194 fractionation Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
- 229910052786 argon Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
-
- 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
-
- 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
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04781—Pressure changing devices, e.g. for compression, expansion, liquid pumping
Landscapes
- 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 invention provides a booster expander air supply system and air separation equipment, which belong to the technical field of air separation and are used for supplying air to a fractionating tower. The air separation device adopts the air supply system of the booster expander. The air supply system and the air separation equipment of the booster expander are low in cost, more energy-saving and greatly improved in gas extraction rate.
Description
Technical Field
The invention belongs to the technical field of air separation, and particularly relates to a booster expander air supply system and air separation equipment adopting the booster expander air supply system.
Background
The air separation equipment is equipment which takes air as a raw material, turns the air into liquid state by a compression circulation deep freezing method, and gradually separates and produces inert gases such as oxygen, nitrogen, argon and the like from the liquid air by rectification. Air separation plant air supply is refrigerated by expansion, and the refrigeration of the whole air separation plant strictly follows a classical refrigeration cycle. The air-separation refrigeration apparatus generally referred to is mainly referred to as an expander. The domestic expander is limited by materials at the present stage, the expansion amount and the rotating speed are mutually restricted, the larger the expansion amount is, the larger the impeller diameter is, the limit value is provided for the edge linear speed, the rotating speed is determined not to be too high, and the high-speed and high-efficiency can not be achieved, compared with the American expander, the refrigerating capacity is reduced by more than 10%. The price of the American expander is high, which is equivalent to eight to ten times of that of the domestic expander. Because the domestic expander has low efficiency, larger expansion gas volume is needed, and the expansion gas volume is large, because the gas volume entering the upper fractionating tower cannot be too large, otherwise, the distillation of the upper fractionating tower is disturbed, so that part of the expansion gas is discharged and does not enter the upper fractionating tower, and the extraction rate of the fractionating tower is greatly reduced.
Disclosure of Invention
The invention aims to provide a booster expander air supply system and air separation equipment, and aims to solve the problem that the extraction rate of a fractionating tower is greatly reduced when air is supplied by the existing air separation equipment.
In order to achieve the above purpose, the invention adopts the following technical scheme: the utility model provides a booster expander air feed system for to the fractionating tower air feed, including being used for filtering air purification device, be used for the intercommunication air purification device and the first pipeline of fractionating tower upper tower and be used for the intercommunication air purification device and the second pipeline of fractionating tower lower tower, be equipped with first cooler, expander driven first booster compressor, second cooler and expander on the first pipeline in proper order by the entry of first pipeline to the fractionating tower upper tower, still be equipped with on the first pipeline and be used for the main heat exchanger for expanding air heat transfer, the expansion air that passes through first booster compressor gets into the expander after the main heat exchanger, be located on the first pipeline air purification device with still be equipped with the second booster compressor that is used for compressing the gas that gets into first pipeline between the first cooler.
Further, a bypass flow path is further arranged on the first pipeline, the inlet end of the bypass flow path is positioned at the front side of the inlet end of the second supercharger, and the outlet end of the bypass flow path is positioned at the rear side of the outlet end of the second supercharger; and the bypass flow path is provided with an adjusting valve.
Further, the regulating valve is a pneumatic film regulating valve.
Further, the first supercharger includes a compression impeller for compressing intake air, and the expander includes an expander impeller for driving the compression impeller.
Further, the expander impeller and the compression impeller are coaxially fixed, or the expander impeller and the compression impeller are connected through a transmission structure.
Further, the expansion air passing through the first booster passes through the middle lower part of the main heat exchanger and then enters the expander.
Further, the air purifying device is a molecular sieve or a separation membrane.
Further, the gas in the second pipeline passes through the main heat exchanger and then enters the lower tower of the fractionating tower.
Further, the second supercharger is an air compressor.
The air supply system of the booster expander has the beneficial effects that: compared with the prior art, the air supply system of the booster expander is characterized in that the second booster is arranged on the first pipeline, gas filtered by the air filtering equipment is compressed, cooled and then enters the first booster driven by the expander and then enters the expander, the gas is pressurized by the second booster and then passes through the first booster, the pressure in front of the expander is increased, the refrigerating capacity is greatly increased, the expansion capacity is reduced, and the diameter of a rotor of the expander is correspondingly reduced after the expansion capacity is reduced, so that the rotating speed can be increased. The refrigerating effect of the expander is obvious. The corresponding cost of the expander rotor is greatly reduced after the reduction, and the expander rotor is more energy-saving. After the expansion amount is reduced, the gas enters the upper tower of the fractionating tower and then interferes with rectification less, so that redundant gas is not generated, the gas amount discharged by the expander is not required to be discharged, and as the gas amount of the first pipeline is not increased, the residual air filtered by the air purifying device enters the lower tower through the second gas circuit, the processing gas amount of the lower tower is larger, and the gas extraction rate is greatly improved.
The invention also provides air separation equipment, which comprises a fractionating tower and any one of the booster expander air supply systems.
The air separation equipment provided by the invention has the beneficial effects that: according to the air separation equipment, the second booster is arranged on the first pipeline, so that gas filtered by the air filtering equipment is compressed, cooled and then enters the first booster driven by the expander, and then enters the expander, the gas passes through the first booster after being boosted by the second booster, the pressure in front of the expander is increased, the refrigerating capacity is greatly increased, the expansion capacity is reduced, and the diameter of a rotor of the expander is correspondingly reduced after the expansion capacity is reduced, so that the rotating speed can be increased. The refrigerating effect of the expander is obvious. The corresponding cost of the expander rotor is greatly reduced after the reduction, and the expander rotor is more energy-saving. After the expansion amount is reduced, the gas enters the upper tower of the fractionating tower and then interferes with rectification less, so that redundant gas is not generated, the gas amount discharged by the expander is not required to be discharged, and as the gas amount of the first pipeline is not increased, the residual air filtered by the air purifying device enters the lower tower through the second gas circuit, the processing gas amount of the lower tower is larger, and the gas extraction rate is greatly improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a gas supply system of a booster expander according to an embodiment of the present invention.
In the figure: 1. a fractionating tower; 11. the fractionating tower is arranged on the tower; 12. lower fractionating tower; 13. a main condenser; 2. a molecular sieve; 3. a first pipeline; 31. a bypass flow path; 311. adjusting a valve; 32. a second supercharger; 33. a first cooler; 34. a first supercharger; 35. a second cooler; 36. an expander; 4. a second pipeline; 5. a main heat exchanger.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1, a description will now be given of a gas supply system of a booster expander according to the present invention. The booster expander air supply system is used for supplying air to the fractionating tower 1 and comprises an air purifying device for filtering air, a first pipeline 3 for communicating the air purifying device with the upper fractionating tower 11 and a second pipeline 4 for communicating the air purifying device with the lower fractionating tower 12, a first cooler 33, a first booster compressor 34 driven by an expander 36, a second cooler 35 and the expander 36 are sequentially arranged between the inlet of the first pipeline 3 and the upper fractionating tower 11 on the first pipeline 3, a main heat exchanger 5 for exchanging heat for the expanded air is further arranged on the first pipeline 3, the expanded air passing through the first booster compressor 34 enters the expander 36 after passing through the main heat exchanger 5, and a second booster compressor 32 for compressing the gas entering the first pipeline 3 is further arranged between the air purifying device and the first cooler 33 on the first pipeline 3.
Compared with the prior art, the air supply system of the booster expander provided by the invention has the advantages that the second booster 32 is arranged on the first pipeline 3, the air filtered by the air filtering equipment is compressed, cooled and then enters the first booster 34 driven by the expander 36, and then enters the expander 36, the air is boosted by the second booster 32 and then passes through the first booster 34, the front pressure of the expander 36 is increased, the refrigerating capacity is greatly increased, the expansion capacity is reduced, and the diameter of the rotor of the expander 36 is correspondingly reduced after the expansion capacity is reduced, so that the rotating speed can be increased. The refrigeration effect of the expander 36 is thus pronounced. The corresponding cost of the expander 36 rotor is greatly reduced and the expander is more energy efficient. After the expansion amount is reduced, the gas enters the upper tower 11 of the fractionating tower and then interferes with rectification less, so that redundant gas is not generated, the gas amount discharged by the expander 36 is not required to be discharged, the residual air filtered by the air purifying device enters the lower tower through the second gas path because the gas amount of the first pipeline 3 is not increased, the processing gas amount of the lower tower is larger, and the gas extraction rate is greatly improved.
Further, referring to fig. 1, as a specific embodiment of the air supply system of the booster expander provided by the invention, a bypass flow path 31 is further provided on the first pipeline 3, an inlet end of the bypass flow path 31 is located at a front side of an inlet end of the second booster 32, and an outlet end of the bypass flow path 31 is located at a rear side of an outlet end of the second booster 32; the bypass flow path 31 is provided with an adjustment valve 311. The bypass flow path 31 and the booster 32 are arranged on the first pipeline 3 in parallel, the bypass flow path 31 is arranged to adjust the pressure difference between the front end pipeline and the rear end pipeline of the booster 32, the adjusting valve is arranged to control the flow of the bypass flow path 31 conveniently, the opening between the expander 36 and the booster 32 is convenient, the opening of the expander 36 is not affected mutually, during the starting, the expander 36 is firstly started, the adjusting valve 311 is maximally opened, then the booster 32 is started, then the adjusting valve 311 is closed or closed, and the damage to the expander 36 caused by the first starting of the booster 32 is prevented.
Further, referring to fig. 1, as a specific embodiment of the air supply system of the booster expander provided by the present invention, the adjusting valve 311 is a pneumatic film adjusting valve. Convenient to use, the regulation precision is high.
Further, referring to fig. 1, as an embodiment of the booster expander gas supply system provided by the present invention, the first booster 34 includes a compression impeller for compressing the intake air, and the expander 36 includes an expander impeller for driving the compression impeller. The air is compressed by the compression impeller (or the compressor rotor) and then cooled, and the air is expanded by the expansion impeller, so that the secondary cooling is realized, and the temperature is lower.
Further, referring to fig. 1, as a specific embodiment of the air supply system of the booster expander provided by the invention, the expander impeller and the compression impeller are coaxially fixed, or the expander impeller and the compression impeller are connected through a transmission structure. The transmission structure can be a gear transmission or a belt wheel transmission, etc.
Further, referring to fig. 1, as an embodiment of the air supply system of the booster expander provided by the present invention, the expanded air passing through the first booster 34 passes through the middle lower portion of the main heat exchanger 5 and then enters the expander 36. The cooled compressed air is subjected to heat exchange again through the main heat exchanger 5, and the cold energy can be recovered by reverse flow.
Further, referring to fig. 1, as a specific embodiment of the air supply system of the booster expander provided by the present invention, the air purifying device is a molecular sieve 2 or a separation membrane. The impurities in the air can be filtered by utilizing a molecular sieve 2 or a membrane separation technology (namely, impurities are filtered by utilizing a separation membrane), and the residual simple substance gas is convenient to separate.
Further, referring to fig. 1, as a specific embodiment of the air supply system of the booster expander provided by the present invention, the air in the second pipeline 4 passes through the main heat exchanger 5 and then enters the lower tower of the fractionating tower. The gas in the optional second pipeline 4 passes through the bottom of the main heat exchanger 5 and then comes out to enter the lower tower of the fractionating tower, and heat exchange can be performed by reverse flow through the main heat exchanger 5. The first pipeline 3 and the second pipeline 4 both pass through the main heat exchanger 5, and the main heat exchanger 5 can exchange heat by the same heat exchange device or different heat exchange devices and other devices.
Further, referring to fig. 1, as an embodiment of the air supply system of the booster expander provided by the present invention, the second booster 32 is an air compressor. The air compressor is driven by a motor or by an oil engine or indirectly by a transmission device.
The invention also provides air separation equipment. Referring to fig. 1, the air separation plant includes a fractionation column 1 and any one of the booster expander air supply systems described above. The fractionation column 1 includes a fractionation column upper column 11, a fractionation column lower column 12, and a main condenser 13 disposed between the fractionation column upper column 11 and the fractionation column lower column 12. The fractionation column 1 may be a conventional air separation column.
According to the air separation equipment provided by the invention, the second booster 32 is arranged on the first pipeline 3, so that gas filtered by the air filtering equipment is compressed, cooled and then enters the first booster 34 driven by the expander 36, and then enters the expander 36, and after being boosted by the second booster 32, the air separation equipment passes through the first booster 34, the front pressure of the expander 36 is increased, the refrigerating capacity is greatly increased, the expansion capacity is reduced, and after the expansion capacity is reduced, the diameter of a rotor of the expander 36 is correspondingly reduced, so that the rotating speed can be increased. The refrigeration effect of the expander 36 is thus pronounced. The corresponding cost of the expander 36 rotor is greatly reduced and the expander is more energy efficient. After the expansion amount is reduced, the gas enters the upper tower 11 of the fractionating tower and then interferes with rectification less, so that redundant gas is not generated, the gas amount discharged by the expander 36 is not required to be discharged, the residual air filtered by the air purifying device enters the lower tower through the second gas path because the gas amount of the first pipeline 3 is not increased, the processing gas amount of the lower tower is larger, and the gas extraction rate is greatly improved.
As a specific embodiment of the present invention, taking 15000 oxygen production as an example (the first main heat exchanger 5 expansion air passage design pressure is 0.9 MPa): referring to fig. 1, the first pipeline 3 at the inlet of the supercharger 32 is provided with two paths of air inlet, one path is provided with an oil-free drying supercharger 32, (the supercharging pressure is 0.2MPa, the air quantity is 13000Nm3/h, the inlet pressure is 0.4-0.49 MPa, the outlet pressure is 0.6-0.69 MPa), and the other path is provided with a bypass flow path 31, and a pneumatic film regulating valve is arranged. The oil free dryer booster 32 aftercooler is designed. The lubricating oil system, the seal gas system, the oil pressure, the shaft temperature and the rotating speed interlocking system of the supercharger 32 are configured according to the process requirements.
Before the expander 36 is started, the pneumatic film regulating valve of the bypass flow path 31 is fully opened, after the expander 36 is started, the oil-free dryer booster 32 is controlled at 16000 rpm, after the rotation speed of the booster 32 is stabilized to 6000 rpm, the pneumatic film regulating valve of the bypass flow path 31 is gradually closed, the pressure before the booster 32 is increased from 0.48MPa to 0.68MPa, the pressure after the booster 32 is increased from 0.68MPa to 0.88MPa, and the pressure difference and the rotation speed of the front end and the rear end of the oil-free dryer booster 32 are regulated by the pneumatic film regulating valve of the bypass flow path 31. As the front pressure of the expander 36 is increased by 0.2MPa, the refrigerating capacity is increased by more than 15%, and the expansion capacity can be reduced by 15%. After the expansion amount is reduced, the diameter of the rotor of the expander 36 (i.e., the expander impeller 342) is reduced by 5%, and the maximum rotational speed can be increased by 10%. The refrigeration effect of the high-speed and high-efficiency expander 36 is thus enhanced. Meanwhile, the expansion amount can be reduced by 15%, the rectification interference on the upper tower 11 of the oxygen production fractionating tower is smaller, the processing air amount of the lower tower is larger, the oxygen extraction rate is higher, the oxygen yield is increased to 300Nm3/h, the argon fraction discharged from the upper tower is more stable, and the argon extraction rate is increased by 10%.
As a specific embodiment of the present invention, taking 35000 oxygen production as an example (the first main heat exchanger 5 expansion air passage design pressure is 1.8 MPa): referring to fig. 1, the first pipeline 3 for modifying the inlet of the supercharger 32 is provided with two paths of air inlet, one path is provided with an oil-free drying supercharger 32, (the supercharging pressure is 0.6MPa, the air quantity is 30000Nm3/h, the inlet pressure is 0.4-0.49 MPa, the outlet pressure is 1.0-1.09 MPa), and the other path is provided with a bypass flow path 31, and a pneumatic film regulating valve is arranged. The supercharger 32 aftercooler is designed. The lubricating oil system, the seal gas system, the oil pressure, the shaft temperature and the rotating speed interlocking system of the supercharger 32 are configured according to the process requirements.
Before the expander 36 is started, the pneumatic film regulating valve of the bypass flow path 31 is fully opened, after the expander 36 is started, the oil-free dryer booster 32 is controlled at 20000 rpm, after the rotation speed of the booster 32 is stabilized to 6000 rpm, the pneumatic film regulating valve of the bypass flow path 31 is gradually closed, the pressure before the booster 32 is increased from 0.4MPa to 1.0MPa, the pressure after the booster 32 is increased from 0.6MPa to 1.2MPa, and the rotation speed of the oil-free dryer booster 32 is regulated by the pneumatic film regulating valve of the bypass flow path 31. As the front pressure of the expander 36 is increased by 0.6MPa, the refrigerating capacity is increased by more than 45%, and the expansion capacity can be reduced by 45%. After the expansion amount is reduced, the diameter of the rotor of the expander 36 is reduced by 25%, and the maximum rotation speed can be increased by 50%. The refrigeration effect of the high-speed and high-efficiency expander 36 is thus enhanced. Meanwhile, the expansion amount can be reduced by 45%, the rectification interference on the upper tower 11 of the oxygen production fractionating tower is smaller, the processing air amount of the lower tower is larger, the oxygen extraction rate is higher, the oxygen yield is increased to 3000Nm3/h, the argon fraction discharged from the upper tower is more stable, and the argon extraction rate is increased by 30%.
The installation method comprises the following steps:
the first step, the first pipeline 3 is set to be two paths of air inlet;
the second step, one is an oilless dryer booster 32;
the third step, the other way is a bypass flow path 31, and a pneumatic film regulating valve is arranged;
a fourth step of installing a first cooler 33 of a post-station of the oilless dryer booster 32; the two paths of air inlet merging pipelines enter the first cooler 33;
fifthly, configuring a lubricating oil system, a seal gas system and an oil pressure, shaft temperature and rotating speed interlocking system of the oil-free drying booster 32 according to process requirements;
and sixthly, before starting the expander 36, fully opening the pneumatic film regulating valve of the bypass flow path 31, after starting the expander 36 (the speed can be controlled to 20000 rpm) and then starting the oilless dryer booster 32, after stabilizing the rotating speed of the booster 32 (to 20000 rpm), gradually closing the pneumatic film regulating valve of the bypass flow path 31, increasing the pressure before the booster 32 from 0.48MPa to 0.68MPa, increasing the pressure after the booster 32 from 0.68MPa to 0.88MPa, and regulating the pressure of a pipeline at the rear end of the booster 32 by using the pneumatic film regulating valve of the bypass flow path 31 and the rotating speed of the booster 32. The supercharger 32 may be driven by a motor, or may be connected to a speed reducer, which drives a rotation shaft of the supercharger 32.
The beneficial effects are that: after the expansion amount of 15000 oxygen production is reduced, the diameter of the rotor of the expander 36 is reduced by 5%, and the maximum rotating speed can be increased by 10%. The refrigeration effect of the high-speed and high-efficiency expander 36 is thus enhanced. (after the amount of oxygen production expansion of 35000 is reduced, the diameter of the rotor of the expander 36 is reduced by 25%, and the maximum rotating speed can be increased by 50%), the refrigerating effect of the high-speed and high-efficiency expander 36 is remarkably improved. Meanwhile, the expansion amount can be reduced by 15% -45%, the rectification interference on the upper tower 11 of the oxygen production fractionating tower is smaller, the processing gas amount of the lower tower is larger, and the oxygen extraction rate is higher. The argon fraction from the upper column will also be more stable.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. The utility model provides a booster expander air feed system for to the fractionating tower air feed, including the air purification device who is used for filtering the air, be used for the intercommunication the first pipeline of tower on air purification device and the fractionating tower and be used for the intercommunication the second pipeline of tower under air purification device and the fractionating tower, be equipped with first cooler, expander driven first booster compressor, second cooler and expander on the first pipeline in proper order by the entry of first pipeline to the fractionating tower on between the tower, still be equipped with on the first pipeline and be used for the main heat exchanger for the expansion air heat transfer, the expansion air that passes through first booster compressor passes through get into expander, its characterized in that behind the main heat exchanger: a second booster for compressing the gas entering the first pipeline is further arranged on the first pipeline and between the air purifying device and the first cooler; the first pipeline is also provided with a bypass flow path, the inlet end of the bypass flow path is positioned at the front side of the inlet end of the second supercharger, and the outlet end of the bypass flow path is positioned at the rear side of the outlet end of the second supercharger; an adjusting valve is arranged on the bypass flow path;
wherein the air purifying device is a molecular sieve or a separation membrane.
2. The booster expander air supply system of claim 1, wherein: the regulating valve is a pneumatic film regulating valve.
3. The booster expander air supply system of claim 1, wherein: the first supercharger includes a compression impeller for compressing intake air, and the expander includes an expander impeller for driving the compression impeller.
4. A booster expander air supply system as defined in claim 3, wherein: the expander impeller and the compression impeller are coaxially fixed, or the expander impeller and the compression impeller are connected through a transmission structure.
5. The booster expander air supply system of claim 4, wherein: the expansion air passing through the first booster passes through the middle lower part of the main heat exchanger and then enters the expander.
6. The booster expander air supply system of claim 1, wherein: and the gas in the second pipeline passes through the main heat exchanger and then enters a lower tower of the fractionating tower.
7. The booster expander air supply system of claim 1, wherein: the second supercharger is an air compressor.
8. Air separation equipment, including the fractionating tower, its characterized in that: further comprising a booster expander air supply system as defined in any one of claims 1-7.
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| CN201810190863.8A CN108240734B (en) | 2018-03-08 | 2018-03-08 | Air supply system of booster expander and air separation equipment |
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| CN201810190863.8A CN108240734B (en) | 2018-03-08 | 2018-03-08 | Air supply system of booster expander and air separation equipment |
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