CN107588667B - Star-shaped multi-layer condensation evaporator - Google Patents
Star-shaped multi-layer condensation evaporator Download PDFInfo
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- CN107588667B CN107588667B CN201710944196.3A CN201710944196A CN107588667B CN 107588667 B CN107588667 B CN 107588667B CN 201710944196 A CN201710944196 A CN 201710944196A CN 107588667 B CN107588667 B CN 107588667B
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Abstract
The invention relates to a star-shaped multilayer condensation evaporator, and belongs to the technical field of air separation equipment. The nitrogen gas passageway is the individual layer seal structure, the liquid oxygen passageway is multilayer structure, the bottom both sides of every layer of liquid oxygen passageway are equipped with the liquid oxygen import, the top both sides are equipped with the oxygen export, be provided with respectively between each heat exchanger and connect the liquid bucket in each heat exchanger both sides, the liquid bucket is multilayer structure and be provided with overflow downcomer between layer and the layer, except that the lowest floor of liquid oxygen passageway does not set up the liquid bucket, every layer of liquid bucket and every layer structure one-to-one of liquid oxygen passageway, liquid bucket intercommunication liquid oxygen import is equipped with the breach between liquid bucket layer and the layer, the breach intercommunication the oxygen export. The invention enlarges the heat exchange area of the condensing evaporator by times, reduces the energy consumption, and can meet the heat exchange area requirement of the condensing evaporator of 8-10 ten thousand-grade air separation equipment.
Description
Technical Field
The invention belongs to the technical field of air separation equipment, and particularly relates to a star-shaped multi-layer condensation evaporator with large heat exchange capacity.
Background
The condensing evaporator is a core device in low-temperature air separation equipment, and mainly condenses pressure nitrogen from a lower tower of a rectifying tower, and liquid oxygen in an upper tower of the rectifying tower is evaporated. At present, the condensing evaporators commonly used in air separation equipment are two types of bath type and film type, and the heat exchange units of the condensing evaporators are all aluminum plate-fin type. The heat exchange unit of the bath type condensing evaporator is soaked in low-pressure liquid oxygen, the liquid oxygen exchanges heat with nitrogen in the heat exchange channel of the condensing evaporator and then is vaporized, and the nitrogen is condensed. The film type condensing evaporator is characterized in that liquid oxygen is conveyed to the top of the film type condensing evaporator by gravity or a liquid oxygen pump, is uniformly distributed into channels of a heat exchange unit through a liquid distributor, forms a layer of liquid film flowing downwards on the vertical wall surface of the channels, and is vaporized by heat exchange with gas nitrogen in a nitrogen channel while flowing downwards along the wall surface. Compared with the bath type condensation evaporator, the film type condensation evaporator has larger heat transfer coefficient, so the heat exchange temperature difference can be controlled to be smaller, and the film type condensation evaporator has obvious advantages in energy saving and consumption reduction, but has higher manufacturing difficulty and running risk than the bath type condensation evaporator, and has lower domestic application at present due to higher risk.
The current bath type condensation evaporator is distinguished from the structural form, and mainly comprises three types of vertical single layer, vertical double layer and horizontal multi-column. The vertical single-layer structure is simple, and a plurality of (1, 2, 3 or 4) plate-type arranged shells are arranged in star-shaped or parallel; the vertical double-layer is provided with an upper layer and a lower layer, and the upper layer and the lower layer are connected with the riser through an overflow pipe; the horizontal multi-column air separation device has the advantages that the structure is longer, the working capacity is large, the main cold heat exchange area requirement of the air separation device with more than 5 ten thousand grades can be met, the occupied space in the cold box is larger, the tubing difficulty is larger, and meanwhile, the support can only be arranged on the wall surface of the cold box, so that the stress received during operation is larger.
With the continuous progress of the upsizing and oversized air separation device, 6-12 ten thousand-grade air separation equipment is continuously introduced, the heat exchange area of the traditional single-layer condensation evaporator and the vertical double-layer condensation evaporator cannot meet the requirement due to the limited diameter, the horizontal multi-row main cooling cannot be popularized due to the fact that the defects of the piping and the supporting are more, and the multi-layer main cooling is complex to manufacture.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the star-shaped multi-layer condensation evaporator with reasonable structural design, which has smaller equipment diameter and lower energy consumption when in the same heat exchange amount compared with the bath-type condensation evaporator with the same height, and can meet the heat exchange area requirement of the condensation evaporator of 8-10 ten thousand-grade air separation equipment.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: the utility model provides a star multilayer condensation evaporator, is in including vertical casing, the inside heat exchanger of vertical casing, liquid oxygen intake manifold, nitrogen gas intake manifold and liquid nitrogen outlet pipe, vertical casing is seal structure, the heat exchanger includes the nitrogen channel of condensation side and the liquid oxygen channel of evaporation side, liquid oxygen intake manifold passes through liquid oxygen intake branch pipe intercommunication vertical casing, nitrogen gas intake manifold's one end passes through nitrogen intake branch pipe intercommunication the top of nitrogen channel, the other end intercommunication vertical casing's outside, liquid nitrogen outlet pipe one end intercommunication nitrogen channel's bottom, the other end intercommunication vertical casing's outside, a plurality of the heat exchanger is the star and arranges, and vertical fixing respectively vertical casing's bottom, nitrogen gas intake manifold sets up in star center, the nitrogen gas channel is individual layer seal structure, liquid oxygen channel's bottom both sides are equipped with the liquid oxygen import, and the top both sides are equipped with the oxygen export, are provided with respectively between each heat exchanger and connect the liquid bucket in both sides, the liquid bucket is multilayer structure and is provided with between the overflow layer, the liquid oxygen bucket is provided with the layer between the liquid oxygen layer and the layer, the liquid oxygen bucket is provided with the liquid oxygen layer, the liquid oxygen layer is not corresponding to the liquid oxygen layer, the liquid oxygen bucket is provided with the gap is in the liquid oxygen layer, each layer is in the liquid oxygen layer.
The upper end and the lower end of each layer of the liquid oxygen channel are provided with V-shaped guide vanes, liquid oxygen enters the liquid oxygen channel through the V-shaped guide vanes at the lower end after passing through the liquid oxygen inlet, and oxygen is released into the shell through the oxygen outlet after passing through the V-shaped guide vanes at the upper end.
The liquid oxygen channel is sequentially provided with four layers from top to bottom.
The notch is of a V-shaped structure.
The liquid bucket is of a V-shaped structure.
The number of the heat exchangers is 6.
Compared with the prior art, the invention has the following advantages and effects:
the evaporation side of the heat exchanger adopts double-side material inlet and outlet, so that the flow rate of inlet liquid and outlet gas is lower, the resistance is smaller, and the distribution is more uniform; the evaporation side adopts a multi-layer structure, the layer height can be reduced to half of the height of the heat exchange unit of the bath condensation evaporator, the height of the liquid column at the evaporation side is reduced, and the nitrogen pressure at the top of the lower column is reduced under the condition of the same heat exchange area, so that the exhaust pressure of the air compressor is reduced, and the energy consumption of the air compressor is reduced; the design of the V-shaped liquid hopper fully utilizes the gaps between the heat exchangers and simultaneously leaves enough gas channels; the V-shaped guide vane design of the evaporation side of the heat exchanger can increase the relative height of the fins of the evaporation side, thereby increasing the heat exchange area of the evaporation side.
Drawings
Fig. 1 is a schematic structural view of a star-shaped multi-layer condensation evaporator according to the present invention.
Fig. 2 is a schematic top view of the star-shaped multi-layer condensation evaporator of the present invention.
Fig. 3 is a cross-sectional view of a front view of the star-shaped multi-layer condensing evaporator of the present invention.
Fig. 4 is a schematic diagram of the liquid oxygen channel and nitrogen channel of the star-shaped multi-layer condensation evaporator according to the present invention.
1. The vertical shell comprises a vertical shell body, 2, a heat exchanger, 3, a liquid oxygen inlet header pipe, 4, a nitrogen inlet header pipe, 5, a liquid nitrogen outlet pipe, 6, a nitrogen channel, 7, a liquid oxygen channel, 8, a liquid oxygen inlet branch pipe, 9, a nitrogen inlet branch pipe, 10, a liquid oxygen inlet, 11, an oxygen outlet, 12, a liquid hopper, 13, an overflow downcomer, 14, a notch, 15 and a V-shaped guide vane.
Detailed Description
The present invention will be further described by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not limited to the following examples.
Referring to fig. 1, 2, 3 and 4, a star-shaped multi-layer condensation evaporator comprises a vertical shell 1, a heat exchanger 2, a liquid oxygen inlet header pipe 3, a nitrogen inlet header pipe 4 and a liquid nitrogen outlet pipe 5, wherein the heat exchanger 2 is arranged in a star-shaped manner, the vertical shell 1 is of a sealing structure, the heat exchanger 2 comprises a nitrogen channel 6 at a condensation side and a liquid oxygen channel 7 at an evaporation side, the liquid oxygen inlet header pipe 3 is communicated with the vertical shell 1 through a liquid oxygen inlet branch pipe 8, one end of the nitrogen inlet header pipe 4 is communicated with the top of the nitrogen channel 6 through a nitrogen inlet branch pipe 9, the other end of the nitrogen inlet header pipe 4 is communicated with the outside of the vertical shell 1, one end of the liquid nitrogen outlet pipe 5 is communicated with the bottom of the nitrogen channel 6, the other end of the liquid nitrogen outlet pipe is communicated with the outside of the vertical shell 1, and a plurality of the heat exchangers 2 are arranged in a star shape, in this embodiment, the heat exchangers 2 are respectively vertically fixed at the bottom of the vertical shell 1, and the star-shaped arrangement is provided for entering and exiting materials from two sides of the liquid oxygen channel at the evaporation side.
The nitrogen inlet header pipe 4 is arranged at the center of the star, and the nitrogen channel 6 is of a single-layer sealing structure, and because the nitrogen channel 6 and the inlet and outlet pipes are arranged inside the vertical shell, the equipment is omitted for connecting an external pipe orifice and a complex external pipe, and the risk of serial leakage and leakage is reduced. The liquid oxygen channels 7 are of a multi-layer structure, in this embodiment, four layers of liquid oxygen channels 7 are sequentially arranged from top to bottom, liquid oxygen inlets 10 are arranged on two sides of the bottom of each layer of liquid oxygen channel, oxygen outlets 11 are arranged on two sides of the top of each layer of liquid oxygen channel, liquid hoppers 12 connected to two sides of each heat exchanger 2 are respectively arranged between each heat exchanger 2, in this embodiment, the liquid hoppers 12 are V-shaped, gaps among the heat exchangers are fully utilized by the liquid hoppers 12, and meanwhile, sufficient gas channels are reserved; the liquid bucket 12 is of a multi-layer structure, an overflow downcomer 13 is arranged between layers, the uppermost layer of the liquid bucket 12 is communicated with the liquid oxygen inlet branch pipe 8, so that liquid oxygen in the uppermost layer of the liquid bucket sequentially enters the lower layer of the liquid bucket through the overflow downcomer 13, each layer of the liquid bucket 12 corresponds to each layer of the liquid oxygen channel 7 one by one except that the lowermost layer of the liquid oxygen channel 7 is not provided with the liquid bucket 12, the liquid buckets 12 are communicated with the liquid oxygen inlet 10, a notch 14 is arranged between the layers of the liquid bucket 12, the notch 14 is V-shaped in the embodiment, and the notch 14 is communicated with the oxygen outlet 11. Liquid oxygen enters the liquid bucket 12 from the liquid oxygen inlet branch pipe 8, enters the liquid oxygen channel 7 through the liquid oxygen inlet 10, and evaporated oxygen is released into the vertical shell 1 through the oxygen outlet 11 and then rises back to the upper tower. The liquid oxygen channel at the lowest layer is not provided with a liquid oxygen hopper, because the liquid oxygen in the liquid oxygen hopper at the lowest layer overflows and is stored at the bottom of the vertical shell, and enters the liquid oxygen channel from the liquid oxygen inlet at the lowest layer.
The upper end and the lower end of each layer of the liquid oxygen channel 7 are provided with V-shaped guide vanes 15, liquid oxygen enters the liquid oxygen channel 7 through the V-shaped guide vanes 15 at the lower end after passing through the liquid oxygen inlet 10, and oxygen is released into the shell 1 through the oxygen outlet 11 after passing through the V-shaped guide vanes 15 at the upper end.
As shown in fig. 1, 2, 3 and 4, the working principle of the invention is as follows:
nitrogen condensation working circuit: the nitrogen comes from the lower tower, and the working pressure of the nitrogen is high, the condensation saturation point is high, the working pressure of liquid oxygen is low, and the evaporation saturation point is low, so that the nitrogen is condensed, and the liquid oxygen is evaporated. Nitrogen enters from the nitrogen inlet header pipe 4, is split into each nitrogen inlet branch pipe 9, is condensed into liquid nitrogen through the nitrogen channel 10 entering the heat exchanger, and enters the lower tower after being collected through each liquid nitrogen outlet pipe 5.
Liquid oxygen evaporation working circuit: liquid oxygen comes from an upper tower, liquid oxygen at the bottom of the upper tower enters a liquid oxygen inlet manifold 3 after being collected and filtered and is split into liquid oxygen inlet branch pipes 8, the liquid oxygen enters a first layer of liquid hopper, liquid oxygen in liquid hoppers at two sides enters a liquid oxygen channel 7 through liquid oxygen inlets 10 at two sides, oxygen is collected in a vertical shell 1 after being released by oxygen outlets 11 at two sides, and the collected oxygen rises back to the upper tower because the vertical shell 1 is communicated with the upper tower. When the liquid oxygen level in the liquid bucket 12 is higher than the pipe opening height of the overflow downcomer 13, the liquid oxygen overflows to the second layer liquid bucket through the overflow downcomer 13, the liquid oxygen of the second layer liquid bucket overflows to the third layer liquid bucket, and as the lowest layer liquid bucket is not arranged, the liquid oxygen of the third layer liquid bucket overflows to the bottom of the vertical shell 1 in the embodiment, the liquid oxygen at the bottom of the vertical shell 1 enters the lowest layer liquid oxygen channel through the liquid oxygen inlets 12 at two sides of the lowest layer, and the oxygen is collected in the vertical shell 1 to rise to the upper tower after being released by the oxygen outlets 11 at two sides.
Claims (3)
1. The utility model provides a star multilayer condensation evaporator, includes vertical casing (1), is in inside heat exchanger (2), liquid oxygen intake manifold (3), nitrogen gas intake manifold (4) and liquid nitrogen outlet pipe (5) of vertical casing (1), vertical casing (1) is seal structure, heat exchanger (2) are including nitrogen passage (6) and evaporation side's liquid oxygen passageway (7) of condensation side, nitrogen gas intake manifold (4) one end is through nitrogen gas intake manifold (9) intercommunication the top of nitrogen passage (6), the other end intercommunication the outside of vertical casing (1), liquid nitrogen outlet pipe (5) one end intercommunication the bottom of nitrogen passage (6), the other end intercommunication the outside of vertical casing (1), its characterized in that: the heat exchangers (2) are arranged in a star shape, the heat exchangers are vertically fixed at the bottom of the vertical shell (1) respectively, the nitrogen inlet header pipe (4) is arranged at the center of the star shape, the nitrogen channel (6) is of a single-layer sealing structure, the liquid oxygen channels (7) are of a multi-layer structure, liquid oxygen inlets (10) are arranged on two sides of the bottom of each layer of liquid oxygen channel, oxygen outlets (11) are arranged on two sides of the top of each layer of liquid oxygen channel, liquid hoppers (12) connected to two sides of each heat exchanger (2) are respectively arranged between the heat exchangers (2), each liquid hopper (12) is of a multi-layer structure, overflow downcomers (13) are arranged between layers, the uppermost layer of each liquid hopper (12) is communicated with a liquid oxygen inlet branch pipe (8), the liquid oxygen inlet header pipe (3) is communicated with each liquid hopper (12) through the liquid oxygen inlet branch pipe (8), each layer of each liquid hopper (12) corresponds to each layer of the structure of each layer of the liquid oxygen channels (7) one by one, and the gap (14) is arranged between each layer of liquid oxygen inlets (12) and the gap (14); v-shaped guide vanes (15) are arranged at the upper end and the lower end of each layer of the liquid oxygen channel (7), liquid oxygen enters the liquid oxygen channel (7) through the V-shaped guide vanes (15) at the lower end after passing through the liquid oxygen inlet (10), and oxygen is released into the vertical shell (1) through the oxygen outlet (11) after passing through the V-shaped guide vanes (15) at the upper end; the notch (14) is of a V-shaped structure; the liquid hopper (12) is of a V-shaped structure.
2. A star-shaped multi-layer condensation evaporator according to claim 1, wherein: the liquid oxygen channel (7) is sequentially provided with four layers from top to bottom.
3. A star-shaped multi-layer condensation evaporator according to claim 1, wherein: the number of the heat exchangers (2) is 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710944196.3A CN107588667B (en) | 2017-10-12 | 2017-10-12 | Star-shaped multi-layer condensation evaporator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710944196.3A CN107588667B (en) | 2017-10-12 | 2017-10-12 | Star-shaped multi-layer condensation evaporator |
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| CN107588667A CN107588667A (en) | 2018-01-16 |
| CN107588667B true CN107588667B (en) | 2023-10-03 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202547277U (en) * | 2011-09-13 | 2012-11-21 | 梅塞尔格里斯海姆(中国)投资有限公司 | Main condensation evaporator of air separation unit |
| EP2657633A1 (en) * | 2012-04-27 | 2013-10-30 | Linde Aktiengesellschaft | Tubing module for air separation unit |
| CN203572143U (en) * | 2013-11-01 | 2014-04-30 | 中空能源设备有限公司 | Kettle type multilayer condensation evaporator |
| CN203687460U (en) * | 2013-12-30 | 2014-07-02 | 中空能源设备有限公司 | Integral plate type multi-layer condensation evaporator |
| CN104390428A (en) * | 2014-12-01 | 2015-03-04 | 杭州福斯达实业集团有限公司 | Large efficient condensation evaporator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10027139A1 (en) * | 2000-05-31 | 2001-12-06 | Linde Ag | Multi-storey bathroom condenser |
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- 2017-10-12 CN CN201710944196.3A patent/CN107588667B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202547277U (en) * | 2011-09-13 | 2012-11-21 | 梅塞尔格里斯海姆(中国)投资有限公司 | Main condensation evaporator of air separation unit |
| EP2657633A1 (en) * | 2012-04-27 | 2013-10-30 | Linde Aktiengesellschaft | Tubing module for air separation unit |
| CN203572143U (en) * | 2013-11-01 | 2014-04-30 | 中空能源设备有限公司 | Kettle type multilayer condensation evaporator |
| CN203687460U (en) * | 2013-12-30 | 2014-07-02 | 中空能源设备有限公司 | Integral plate type multi-layer condensation evaporator |
| CN104390428A (en) * | 2014-12-01 | 2015-03-04 | 杭州福斯达实业集团有限公司 | Large efficient condensation evaporator |
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