CN113405317B - Multi-layer main cooling system for air separation equipment - Google Patents
Multi-layer main cooling system for air separation equipment Download PDFInfo
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- CN113405317B CN113405317B CN202110607224.9A CN202110607224A CN113405317B CN 113405317 B CN113405317 B CN 113405317B CN 202110607224 A CN202110607224 A CN 202110607224A CN 113405317 B CN113405317 B CN 113405317B
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- 238000001816 cooling Methods 0.000 title claims abstract description 35
- 238000000926 separation method Methods 0.000 title claims abstract description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 86
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000007788 liquid Substances 0.000 claims abstract description 42
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 39
- 238000004821 distillation Methods 0.000 claims abstract description 16
- 238000004891 communication Methods 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims 1
- 238000012546 transfer Methods 0.000 description 18
- 230000000694 effects Effects 0.000 description 9
- 229910001873 dinitrogen Inorganic materials 0.000 description 8
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000004411 aluminium Substances 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 210000005056 cell body Anatomy 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- F25J3/04763—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
- F25J3/04787—Heat exchange, e.g. main heat exchange line; Subcooler, external reboiler-condenser
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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
- F25J5/00—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants
- F25J5/002—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants for continuously recuperating cold, i.e. in a so-called recuperative heat exchanger
- F25J5/005—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants for continuously recuperating cold, i.e. in a so-called recuperative heat exchanger in a reboiler-condenser, e.g. within a column
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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
- F25J2250/00—Details related to the use of reboiler-condensers
- F25J2250/04—Down-flowing type boiler-condenser, i.e. with evaporation of a falling liquid film
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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
- F25J2250/00—Details related to the use of reboiler-condensers
- F25J2250/10—Boiler-condenser with superposed stages
-
- 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
- F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
- F25J2290/32—Details on header or distribution passages of heat exchangers, e.g. of reboiler-condenser or plate heat exchangers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention provides a multilayer main cooling system for an air separation plant, which comprises a plurality of heat exchange devices, wherein each heat exchange device comprises a liquid oxygen tank, a plurality of vertically arranged first heat exchange channels are uniformly arranged below the liquid oxygen tank at intervals, a second heat exchange channel is formed between every two adjacent first heat exchange channels, an overflow groove capable of covering the second heat exchange channel is arranged at the top of each second heat exchange channel, the top of each overflow groove is positioned on the same horizontal plane, liquid outlet channels which correspond to the overflow grooves in a one-to-one mode are arranged at the bottom of the liquid oxygen tank, liquid oxygen overflowing from the overflow grooves can flow into the two adjacent first heat exchange channels, first overflow holes are arranged on the liquid oxygen tank, inflow ports are arranged on the side wall of a distillation tower and are positioned below each heat exchange device, the first overflow holes of each heat exchange device are communicated with the inflow ports below the heat exchange device through first pipelines, and nitrogen inlet ports and liquid nitrogen outlet ports are arranged on the second heat exchange channels.
Description
Technical Field
The invention relates to the technical field of air separation equipment, in particular to a multi-layer main cooling system for the air separation equipment.
Background
In a cryogenic air separation plant, a main cooling system is a condensing evaporator which is connected with key heat exchange equipment of an upper tower and a lower tower, and the structure and the heat transfer performance of the main cooling system have direct influence on the energy consumption, the separation efficiency and the capital investment of the air separation plant.
Along with the maximization of air separation equipment, the heat exchange efficiency and the heat exchange speed are also improved through the design of multilayer to air separation equipment's main cold system to deal with the work demand of air separation equipment high load, but current multilayer main cold system still has multiple shortcomings such as heat exchange efficiency is lower, needs to improve main cold system.
Disclosure of Invention
In view of the above, the present application provides a multi-layer main cooling system for an air separation plant to improve the performance of the air separation multi-layer main cooling system.
The invention provides a multilayer main cooling system for an air separation plant, which is arranged in a distillation tower and comprises a plurality of heat exchange devices sequentially arranged at intervals along the vertical direction, wherein each heat exchange device comprises a liquid oxygen tank, a plurality of first heat exchange channels which are vertically arranged are uniformly arranged below the liquid oxygen tank at intervals, a second heat exchange channel is formed between every two adjacent first heat exchange channels, an overflow groove capable of covering the second heat exchange channel is arranged at the top of each second heat exchange channel, the top of each overflow groove is positioned on the same horizontal plane, liquid outlet channels which correspond to the overflow grooves in a one-to-one mode are arranged at the bottom of the liquid oxygen tank, liquid oxygen overflowing from the overflow grooves can flow into the two adjacent first heat exchange channels, first overflow holes are arranged in the liquid oxygen tank, an inflow port is arranged below each heat exchange device on the side wall of the distillation tower, the first overflow holes of each heat exchange device are communicated with the inflow port below the first overflow hole through first pipelines, and a nitrogen and a liquid nitrogen outflow port are arranged in the second heat exchange channels.
Further, the first heat exchange channel comprises two side walls which are arranged in parallel; the second heat exchange channel is arranged between two adjacent first heat exchange channels and shares a side wall with the two adjacent first heat exchange channels.
Further, at least one communicating pipe is arranged between every two adjacent overflow grooves.
Furthermore, the lower part of the first heat exchange channel is provided with an opening, a first distributor and a first heat exchanger are sequentially and alternately arranged in the first heat exchange channel from top to bottom, and at least two first distributors and at least two first heat exchangers are arranged.
Furthermore, a plurality of second overflow holes are formed in the side wall of the first heat exchange channel, the second overflow holes are located on the same horizontal plane of the cylinder, the second overflow holes are formed between the uppermost layer of the first distributor and the tops of the overflow grooves, and the second overflow holes are communicated with the first pipeline.
Furthermore, the plurality of second overflow holes are all collected and communicated with a third pipeline, the third pipeline is communicated with the first pipeline, and a one-way passing valve is arranged on the third pipeline.
Furthermore, the second overflow holes in the adjacent side walls of the adjacent first heat exchange channels are communicated through a second communicating pipe, and the second communicating pipe is communicated with the third pipeline.
Further, the first distributor is a porous fin or a zigzag fin horizontally arranged on two side walls of the first heat exchange channel.
Furthermore, a flow dividing device and a second heat exchanger are sequentially communicated and arranged inside the second heat exchange channel from top to bottom, the flow dividing device is provided with the nitrogen inlet, and the bottom of the second heat exchange channel is provided with the liquid nitrogen outlet.
Further, the liquid nitrogen outlet ports of the plurality of second heat exchange channels are all in gathering communication with a liquid nitrogen delivery pipe arranged outside the distillation tower.
Further, the first heat exchanger is a porous fin arranged in the first heat exchange channel, the porous fin is in thermal coupling connection with the inner side wall of the first heat exchange channel, the second heat exchanger is a porous fin arranged in the second heat exchange channel, and the porous fin is in thermal coupling connection with the outer side wall of the first heat exchange channel.
Furthermore, the first heat exchanger, the second heat exchanger and the side plates on the two sides of the first heat exchange channel are all made of aluminum heat conduction materials.
The invention provides a multilayer main cooling system for an air separation plant, which comprises a plurality of heat exchange devices which are sequentially arranged at intervals along the vertical direction in a distillation tower, so that the heat exchange rate can be increased, the heat exchange effect is improved, liquid oxygen can be uniformly distributed in two adjacent first heat exchange channels by arranging an overflow groove, so that the liquid oxygen is ensured to be uniformly distributed in each first heat exchange channel, and the liquid oxygen can be ensured to be uniformly distributed in the first heat exchange channels by the side edge overflow of the overflow groove, so that the heat exchange efficiency is improved, the heat exchange effect is further improved, and the heat exchange rate of the main cooling system is improved.
In addition, at least two first distributors and first heat exchangers are sequentially and alternately arranged in the first heat exchange channel from top to bottom, so that the film distribution effect on the liquid oxygen can be improved, the heat exchange efficiency between the liquid oxygen and the first heat exchangers is further improved, and the heat exchange rate of the main cooling system is improved.
Furthermore, at least one communicating pipe is arranged between every two adjacent overflow grooves, so that the liquid level in each overflow groove can be kept level, the phenomenon that the liquid oxygen amount in part of the first heat exchange channels is large and the dry evaporation phenomenon is caused by insufficient liquid oxygen amount in part of the first heat exchange channels due to unequal liquid level in the overflow grooves caused by uneven liquid outlet of the liquid outlet channels is avoided, and the heat exchange efficiency and the safety of the main cooling system are ensured.
Furthermore, the second overflow holes in the adjacent side walls of the two adjacent first heat exchange channels are communicated through the second communicating pipe, so that the liquid level in each first heat exchange channel can be further guaranteed to be equal in height, the phenomenon of dry evaporation in part of the first heat exchange channels is further avoided, and the safety of the main cooling system is further improved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of the overall structure of a multi-layer main cooling system for an air separation plant provided by the invention.
Fig. 2 is a schematic structural diagram of a heat exchange device in a multi-layer main cooling system for an air separation plant provided by the invention.
Fig. 3 isbase:Sub>A schematic cross-sectional structure atbase:Sub>A-base:Sub>A inbase:Sub>A multi-layer main cooling system for an air separation plant provided by the invention.
Fig. 4 is a flow chart of a main cooling method for realizing rapid cooling of an air separation plant provided by the invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example one
The invention provides a multilayer main cooling system for an air separation plant, which is arranged in a distillation tower 9, and as a specific implementation manner, referring to fig. 1-3, the main cooling system comprises a plurality of heat exchange devices 1 which are sequentially arranged at intervals along a vertical direction, the heat exchange devices 1 comprise a liquid oxygen tank 10, a plurality of first heat exchange channels 12 which are arranged vertically are uniformly arranged below the liquid oxygen tank 10 at intervals, a second heat exchange channel 13 is formed between two adjacent first heat exchange channels 12, an overflow groove 11 which can cover the second heat exchange channel 13 is arranged at the top of each second heat exchange channel 13, the top of each overflow groove is positioned on the same horizontal plane, liquid outlet channels 101 which are in one-to-one correspondence with the overflow grooves 11 are arranged at the bottom of the liquid oxygen tank 10, liquid oxygen overflowing from the overflow grooves 11 can flow into the two adjacent first heat exchange channels 12, first overflow holes 102 are arranged on the liquid oxygen tank 10, an inlet 91 is arranged below each heat exchange device 1 on the side wall of the distillation tower 9, and a nitrogen outlet 132 and an inlet 131 and a nitrogen outlet 132 are arranged below each heat exchange device 1. The heat exchange device comprises a plurality of heat exchange devices, wherein the heat exchange devices are sequentially arranged in the distillation tower at intervals along the vertical direction, so that the heat exchange speed can be increased, the heat exchange effect is improved, the overflow grooves are formed, the liquid oxygen can be equalized in two adjacent first heat exchange channels, the uniform distribution of the liquid oxygen in each first heat exchange channel is ensured, the side overflow of the overflow grooves can ensure the uniform distribution of the liquid oxygen in the first heat exchange channels, the heat exchange efficiency is improved, the heat exchange effect is further improved, and the heat exchange speed of a main cooling system is improved.
Further, referring to fig. 2, as a preferred embodiment, at least one first communication pipe 110 is arranged between two adjacent overflow chutes 11, and at least one communication pipe is arranged between two adjacent overflow chutes, so that the liquid level in each overflow chute can be ensured to be even, and the phenomena of high liquid oxygen content in part of first heat exchange channels and dry evaporation in part of first heat exchange channels due to insufficient liquid oxygen content caused by unequal liquid level in the overflow chutes when the liquid outlet channel discharges liquid unevenly are avoided, thereby ensuring the heat exchange efficiency and safety of the main cooling system.
Further, referring to fig. 2 and 3, as a specific embodiment, each heat exchange device has a specific structure that: the first heat exchange channel 12 comprises two side walls which are arranged in parallel; the second heat exchange channel 13 is arranged between two adjacent first heat exchange channels 12 and shares a side wall with the two adjacent first heat exchange channels.
Further, the lower part of the first heat exchange channel 12 is provided with an opening, a first distributor 121 and a first heat exchanger 122 are alternately arranged in the first heat exchange channel 12 from top to bottom in sequence, and at least two first distributors 121 and at least two first heat exchangers 122 are arranged; through from last to setting up two at least first distributors, first heat exchanger in proper order in turn down in first heat transfer passageway to can improve the cloth membrane effect to liquid oxygen, further improve the heat exchange efficiency between liquid oxygen and the first heat exchanger, thereby improve the heat transfer rate of main cold system.
Further, a plurality of second overflow holes 12a are formed in the side wall of the first heat exchange channel 12, the plurality of second overflow holes 12a are all located on a same horizontal plane of the cylinder, the second overflow holes 12a are disposed between the uppermost layer of the first distributor 121 and the top of the overflow groove, and the plurality of second overflow holes 12a are all communicated with the first pipeline 103.
Furthermore, the second overflow holes 12a are all collected and communicated with a third pipeline 14, the third pipeline 14 is communicated with the first pipeline 103, and a one-way passing valve 15 is arranged on the third pipeline 14. Through setting up one-way passing valve can only allow the liquid oxygen in the first passageway to flow into the third pipeline, avoid the liquid oxygen in the first pipeline to flow back to in the first heat transfer passageway.
Further, the second overflow holes 12a on the adjacent side walls of the adjacent first heat exchange channels 12 are communicated through a second communication pipe 124, the second communication pipe is communicated with the third pipeline 14, and the second overflow holes on the adjacent side walls of the adjacent two first heat exchange channels are communicated through the second communication pipe, so that the liquid level in each first heat exchange channel can be further ensured to be equal in height, the phenomenon of dry evaporation in part of the first heat exchange channels is further avoided, and the safety of the main cooling system is further improved.
Further, the first distributor 121 is a porous fin or a zigzag fin horizontally disposed on both side walls of the first heat exchange channel 12.
Further, a flow dividing device 130 and a second heat exchanger 133 are sequentially arranged inside the second heat exchange channel 13 from top to bottom in a communicating manner, the flow dividing device 130 is provided with the nitrogen inlet 131, and the bottom of the second heat exchange channel 13 is provided with the liquid nitrogen outlet 132.
Further, the liquid nitrogen outflow ports 132 of the plurality of second heat exchange passages 13 are all in collective communication with a liquid nitrogen delivery pipe 92 provided outside the distillation column 9.
Further, the first heat exchanger 122 is a porous fin disposed in the first heat exchange channel 12, and the porous fin is thermally coupled to the inner sidewall of the first heat exchange channel 12, and the second heat exchanger 133 is a porous fin disposed in the second heat exchange channel 13, and the porous fin is thermally coupled to the outer sidewall of the first heat exchange channel 12.
Further, the first heat exchanger 122, the second heat exchanger 133 and the two side plates of the first heat exchange channel 12 are all made of aluminum heat conduction materials.
Preferably, this main cold system is provided with three layers of heat transfer device 1, refer to fig. 2, every layer of heat transfer device 1 includes shell body 10, and its inside carries out the interval through aluminium system baffle 100 and sets up, is provided with isolation layer 10a between shell body and the heat transfer passageway, and the isolation layer can connect shell body and each heat transfer passageway and can play adiabatic heat retaining effect, and wherein the isolation layer can select foamed rubber to make for use, and rubber forms between the baffle first heat transfer passageway and second heat transfer passageway, and wherein the baffle of aluminium system is the curb plate of first heat transfer passageway, and the overflow launder is the aluminium system cell body of welding setting on two adjacent baffles.
Furthermore, for each heat exchange device 1, the sum of the flow rates of the liquid outlet channels 101 is Q1, wherein Q1 is the flow rate when the liquid oxygen tank is full of liquid oxygen, the sum of the flow rates of the first heat exchange channels 12 is Q2, the flow rate of nitrogen gas input into the second heat exchange channels 13 is Q3, the unit is L/s, wherein 1.5 Q2 is not less than Q1 and not less than 1.2 Q2, by this limiting method, the membrane distribution effect in the first heat exchange channels of each heat exchange device 1 can be ensured, the heat exchange efficiency can be ensured, the redundant liquid oxygen can flow into the heat exchange device below through the first overflow holes in time, the heat exchange device below the next layer can be ensured to have enough liquid oxygen, the utilization rate of the liquid oxygen is improved, and Q3= Q2 (μ 1 μ 2 s 1) 1/2 *&Wherein, mu 1 is the heat exchange coefficient of the first heat exchanger, mu 2 is the heat exchange coefficient of the second heat exchanger, S1 is the sum of the contact areas of the first heat exchange channel and the second heat exchange channel, and the unit is m 2 ，&In order to adjust the coefficient, the value range is 0.375-5.643, the flow of the nitrogen introduced into each heat exchange device is calculated through the formula, the nitrogen air inflow of each heat exchange device can be realized, and the nitrogen can be fully liquefied into the liquid oxygen by heat exchange with the liquid oxygen.
Example two
Referring to fig. 4, the present invention also provides a main cooling method for realizing rapid cooling of an air separation plant, which includes the following steps:
firstly, conveying nitrogen from a lower tower of a distillation tower to a second heat exchange channel 13 of each layer of heat exchange device 1; the liquid oxygen flows down from the upper layer of the distillation tower and flows into the liquid oxygen tank of the heat exchange device 1 at the uppermost layer of the main cooling system.
And step two, part of the liquid oxygen flows into the overflow groove 11 below from the plurality of liquid outlet channels 101, and the liquid oxygen overflows from the top of the overflow groove and flows into the first heat exchange channel 12 below after the overflow groove is filled with the liquid oxygen.
And thirdly, partially evaporating the liquid oxygen in the first heat exchange channel 12 to exchange heat with the nitrogen in the second heat exchange channel 13, so that the nitrogen is liquefied to form liquid nitrogen.
And step four, the liquid level in the liquid oxygen tank at the uppermost layer rises to the position of the first overflow hole 102, the liquid oxygen flows out, and flows into the inflow port 91 at the lower part through the first pipeline 103, so that the liquid oxygen flows into the liquid oxygen tank of the heat exchange device 1 at the lower layer, and part of the liquid oxygen in the first heat exchange channel of the heat exchange device 1 at the uppermost layer flows down and flows into the liquid oxygen tank of the heat exchange device 1 at the lower layer.
And step five, repeating the step two and the step three in the lower-layer heat exchange device 1, so that the liquid oxygen is conveyed downwards until the liquid oxygen flows into the heat exchange device 1 at the lowest layer of the main cooling system, and the liquid oxygen in the heat exchange device 1 at the lowest layer flows to the bottom of the upper tower of the distillation tower, so that the nitrogen is liquefied, and the high-purity liquid oxygen is formed at the bottom of the upper tower of the distillation tower.
Furthermore, a plurality of overflow chutes are arranged in each layer of heat exchange device, a first communication pipe 110 is arranged between two adjacent overflow chutes, and after liquid oxygen flows into the overflow chutes from the liquid oxygen chutes, the liquid levels in the overflow chutes are communicated and maintained at the same horizontal plane through the first communication pipe, so that the liquid oxygen uniformly flows into the first heat exchange channel below.
Further, the third step includes: s31, liquid oxygen flows into the first heat exchange channel, flows through the first distributor 121 to uniformly distribute the liquid oxygen to flow to the first heat exchanger 122 below, and is subjected to partial evaporation heat exchange through the first heat exchanger, and the liquid oxygen which is not evaporated continuously flows downwards to the first distributor 121 on the next layer to be uniformly distributed again and then flows to the first heat exchanger 122 on the next layer to exchange heat until the liquid oxygen flows out from the lower part of the first heat exchange channel.
S32, the nitrogen is divided by the flow dividing device 130 in the second heat exchange channel and flows into the second heat exchanger 133, and heat exchange is carried out between the nitrogen and the first heat exchanger through the second heat exchanger, so that the nitrogen is liquefied to form liquid nitrogen, and the liquid nitrogen flows downwards and flows out from a liquid nitrogen outlet 132 at the lower part of the second heat exchange channel.
Further, liquid level rises gradually after liquid oxygen flows into first heat transfer passageway, and when the liquid level reached the height of second overflow hole, liquid oxygen flowed into second communicating pipe to can balance the height of liquid level in a plurality of first heat transfer passageways, then liquid oxygen flowed into first pipeline 103 through first communicating pipe, carried to next floor.
Referring to fig. 1, wherein the nitrogen gas of lower tower is responsible for deriving through the nitrogen gas, every layer of heat transfer device's all intercommunication has the nitrogen gas to carry to be in charge of and the liquid nitrogen is carried to be in charge of, the nitrogen gas is carried to be in charge of all with the nitrogen gas and is communicate, the nitrogen gas inlet port 131 of a plurality of second heat transfer passageways of every heat transfer device 1 all carries to be in charge of with the nitrogen gas and communicates, the liquid nitrogen egress opening 132 of a plurality of second heat transfer passageways of every heat transfer device 1 all carries to be in charge of with the liquid nitrogen and communicates, a plurality of liquid nitrogen are carried to be in charge of all with liquid nitrogen conveyer pipe 92 intercommunication.
EXAMPLE III
In order to verify the technical effect of the technical solution of the present application, the following two tests are performed in this embodiment for comparison.
Test one: the cooling is carried out during air separation by adopting the traditional technology, namely, a heat exchanger and a separation tower are tightly combined in the low-temperature separation process, and all refrigeration energy is provided by an air compressor at the inlet of the device.
And (2) test II: by adopting the technical scheme, the air separation equipment is rapidly cooled.
Through comparison of the first test and the second test, the technical scheme of the application is adopted to rapidly cool the air separation equipment to achieve the same temperature, the efficiency of the application is improved by 12.4-18.5% compared with the traditional mode, and the energy consumption is reduced by 5.4-10.8%.
The foregoing description is only exemplary of the preferred embodiments of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (6)
1. A multi-layer main cooling system for an air separation plant is provided in a distillation column (9), it is characterized by comprising a plurality of heat exchange devices (1) which are sequentially arranged at intervals along the vertical direction, the heat exchange device (1) comprises a liquid oxygen tank (10), a plurality of vertically arranged first heat exchange channels (12) are uniformly arranged below the liquid oxygen tank (10) at intervals, a second heat exchange channel (13) is formed between every two adjacent first heat exchange channels (12), the top of each second heat exchange channel (13) is provided with an overflow groove (11) capable of covering the second heat exchange channel (13), and the top of each overflow groove is positioned on the same horizontal plane, liquid outlet channels (101) which are in one-to-one correspondence with the overflow grooves (11) are arranged at the bottom of the liquid oxygen groove (10), liquid oxygen overflowing from the overflow grooves (11) can flow into two adjacent first heat exchange channels (12), a first overflow hole (102) is arranged on the liquid oxygen tank (10), an inflow port (91) is arranged on the side wall of the distillation tower (9) and positioned below each heat exchange device (1), the first overflow hole (102) of each heat exchange device (1) is communicated with the inflow port (91) below the first overflow hole through a first pipeline (103), the second heat exchange channel (13) is provided with a nitrogen inlet (131) and a liquid nitrogen outlet (132); the lower part of the first heat exchange channel (12) is provided with an opening, and a first distributor (121) and a first heat exchanger (122) are alternately arranged in the first heat exchange channel (12) from top to bottom in sequence; a plurality of second overflow holes (12 a) are formed in the side wall of each first heat exchange channel (12), the second overflow holes (12 a) are all located on the same horizontal plane, the second overflow holes (12 a) are arranged between the uppermost first distributor (121) and the tops of the overflow grooves, and the second overflow holes are all communicated with the first pipeline (103); the second overflow holes are all collected and communicated with a third pipeline (14), the third pipeline (14) is communicated with the first pipeline (103), and a one-way passing valve (15) is arranged on the third pipeline (14).
2. The multi-layer main cooling system for air separation plants according to claim 1, wherein said first distributor (121) is a perforated fin or a zigzag fin horizontally disposed on both side walls of said first heat exchange passage (12).
3. The multi-layer main cooling system for the air separation plant according to claim 1, wherein a flow dividing device (130) and a second heat exchanger (133) are sequentially arranged inside the second heat exchange channel (13) from top to bottom in a communication manner, the flow dividing device (130) is provided with the nitrogen inlet (131), and the bottom of the second heat exchange channel (13) is provided with the liquid nitrogen outlet (132).
4. The multi-layer main cooling system for an air separation plant according to claim 3, wherein said liquid nitrogen outflow ports (132) of a plurality of said second heat exchange passages (13) are all in collective communication with a liquid nitrogen delivery pipe (92) provided outside said distillation column (9).
5. The multi-layer main cooling system for an air separation plant according to claim 4, wherein the first heat exchanger (122) is a porous fin disposed in the first heat exchange channel (12) and thermally coupled to an inner side wall of the first heat exchange channel (12), the second heat exchanger (133) is a porous fin disposed in the second heat exchange channel (13) and thermally coupled to an outer side wall of the first heat exchange channel (12).
6. The multi-layer main cooling system for the air separation plant according to claim 1, wherein the first heat exchanger (122), the second heat exchanger (133) and the two side plates of the first heat exchange channel (12) are all made of aluminum heat conductive materials.
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| US2913882A (en) * | 1954-05-06 | 1959-11-24 | Air Prod Inc | Method and apparatus for fraction-ating gaseous mixtures |
| CN100585310C (en) * | 2006-08-15 | 2010-01-27 | 杭州杭氧股份有限公司 | Segregation condensation type evaporator |
| CN102650491B (en) * | 2012-05-10 | 2013-10-16 | 西安交通大学 | Plate-fin film type main cold liquid distributor for air separation |
| CN203454855U (en) * | 2013-06-12 | 2014-02-26 | 开封迪尔空分实业有限公司 | High efficiency shell and tube type heat exchanger |
| CN203572143U (en) * | 2013-11-01 | 2014-04-30 | 中空能源设备有限公司 | Kettle type multilayer condensation evaporator |
| CN109631493A (en) * | 2019-01-25 | 2019-04-16 | 上海联风能源科技有限公司 | A kind of double tower backflows double condenser/evaporator High Purity Nitrogen process units and its production method |
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Address after: Building 2, No. 103 Donggang Second Road, Quzhou City, Zhejiang Province, 324022 Patentee after: Zhejiang Teying Low Temperature Liquefaction Equipment Co.,Ltd. Country or region after: China Address before: Plant 3, No. 292, Renliang Road, Renhe Street, Yuhang District, Hangzhou City, Zhejiang Province, 311100 Patentee before: Hangzhou Teying Cryogenic Liquefaction Equipment Co.,Ltd. Country or region before: China |
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