CN203687518U - Low-purity oxygen preparing device with auxiliary rectifying tower - Google Patents

Low-purity oxygen preparing device with auxiliary rectifying tower Download PDF

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Publication number
CN203687518U
CN203687518U CN201420045405.2U CN201420045405U CN203687518U CN 203687518 U CN203687518 U CN 203687518U CN 201420045405 U CN201420045405 U CN 201420045405U CN 203687518 U CN203687518 U CN 203687518U
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oxygen
column
rectifying column
auxiliary
liquid
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CN201420045405.2U
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黄震宇
陈彩霞
江蓉
吴琦
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Sichuan Air Separation Plant (group) Co Ltd
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Sichuan Air Separation Plant (group) Co Ltd
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Abstract

The utility model relates to a low-purity oxygen preparing device, in particular to a low-purity oxygen preparing device with an auxiliary rectifying tower. The low-purity oxygen preparing device with the auxiliary rectifying tower comprises a first-stage rectifying tower (C1), a second-stage rectifying tower (C2), a main condensing evaporator (K1), a liquid air and liquid nitrogen subcooler (E2), the auxiliary rectifying tower (C3) and an auxiliary oxygen rectifying tower evaporator (K2), wherein expansion air providing a cold source and taking part in rectification is connected with the second-stage rectifying tower (C2) through a pipeline, raw material air close to the liquefying point is respectively connected with the first-stage rectifying tower (C1) and the auxiliary oxygen rectifying tower evaporator (K2), and the bottom of the second-stage rectifying tower (C2) is connected with the auxiliary rectifying tower (C3). The obtained low-purity liquid oxygen can be pressurized through the liquid level height difference or a liquid oxygen pump and exchanges heat with pressurized air to obtain pressured low-purity oxygen gas. By efficiently adjusting the loads of the auxiliary oxygen evaporator and the main condensing evaporator, the pressure of the raw material air of the low-purity oxygen preparing device is largely reduced, and therefore energy consumption is reduced.

Description

With the low purity oxygen device for making of auxiliary distillation column
Technical field
The utility model relates to low purity oxygen device for making, is a kind of air-separating plant that can significantly reduce energy consumption and simple possible, is specially the low purity oxygen device for making with auxiliary distillation column.
Background technology
Along with industrial expansion, user is in great demand to low-purity oxygen, and as in thermal power plant, in order to improve coal combustion efficiency, low purity oxygen is introduced into the oxygen-enriched combusting that participates in coal; Smelting industry needs a large amount of low purity oxygens.The air separation plant of low purity oxygen production gas is big power consumer, because equipment moves for a long time, how can effectively reduce energy consumption most important.Low purity oxygen is at present mainly from VPSA, but is not easy to obtain high pure nitrogen simultaneously, and purity tolerances is in below 93%, cannot obtain liquid form product for subsequent use, and large-scale is very limited; Some presses rectification method in adopting, process organization's complexity, and high being unfavorable for of rectifying pressure separate, and adopt conventional cryogenic rectification technique to have the shortcoming that energy consumption is high;
Summary of the invention
The utility model is just for above technical problem, provide one can effectively reduce raw gas pressure, reduce energy consumption, the low purity oxygen device for making with auxiliary distillation column easy and simple to handle, in employing this programme, can obtain pressure nitrogen gas or low pressure nitrogen and liquid form product stores as for subsequent use simultaneously, can replace VPSA, reduce nitrogen oxide, PM2.5, greenhouse effects, have very important significance to energy-saving, emission-reducing, environment friendly.
To achieve these goals, the technical solution adopted in the utility model is such:
With the low purity oxygen device for making of auxiliary distillation column, this device comprises one-level rectifying column, two-stage rectification tower, condenser/evaporator, liquid air liquid nitrogen subcooler, auxiliary oxygen rectifying column and auxiliary oxygen rectifying column evaporimeter, the expanded air that low-temperature receiver is provided and participates in rectifying is connected with two-stage rectification tower by airflow pipe; The raw air that approaches liquefaction point is connected with the condensation end entrance of one-level rectifying column and auxiliary oxygen rectifying column evaporimeter respectively by airflow pipe; The bottom of two-stage rectification tower is connected with auxiliary oxygen rectifying column, the liquid air outlet of one-level rectifier bottoms is connected with liquid air liquid nitrogen subcooler and two-stage rectification tower respectively, between one-level rectifying column and two-stage rectification tower, condenser/evaporator is set, auxiliary oxygen rectifying column is connected with auxiliary oxygen rectifying column evaporimeter.The nitrogen outlet at the top of one-level rectifying column is connected with the condensation side of condenser/evaporator.The liquid nitrogen outlet of condenser/evaporator condensation side is connected with two-stage rectification tower by liquid air liquid nitrogen subcooler, and liquid air liquid nitrogen subcooler is connected with one-level rectifying column.The dirty Air Export of liquid of one-level rectifying column middle and lower part is connected with two-stage rectification tower by liquid air liquid nitrogen subcooler.The nitrogen outlet of two-stage rectification top of tower is connected with liquid air liquid nitrogen subcooler, heat exchanger and nitrogen discharge pipeline respectively, and the oxygen outlet of two-stage rectification tower bottom is connected with nitrogen discharge pipeline.
Two-stage rectification tower, auxiliary oxygen rectifying column are lower pressure column, and the raw material of auxiliary oxygen rectifying column is from the impure rich solution oxygen of tower reactor of two-stage rectification tower; The evaporation thermal source of auxiliary oxygen rectifying column is not the top gaseous phase that derives from one-level rectifying column, but identical with the bottom air inlet of one-level rectifying column.
The thermal source of auxiliary oxygen rectifying column evaporimeter is with one logistics with the raw air that enters one-level rectifying column.And the raw material of auxiliary oxygen rectifying column is from two-stage rectification tower bottom.
Also comprise the form of low purity oxygen from supercharging or interior compression with the low purity oxygen device for making of auxiliary distillation column: poor or liquid oxygen pump pressurization is connected with pressurized air heat exchanger auxiliary oxygen rectifying column evaporimeter through liquid level, mainly change liquid air into the pressurized air of liquid oxygen heat exchange and be connected with one-level rectifying column; Low purity oxygen compresses similar in supercharging or pump from supercharging or interior compression and conventional empty point oxygen, no longer statement.When required low purity oxygen pressure lower, when oxygen purity is higher, pressurized air that also can be above-mentioned, and adopt the raw air heat exchange identical with one-level rectifying column bottom.
Further, also comprise except argon column with except argon column condenser with the low purity oxygen device for making of auxiliary distillation column, assist oxygen rectifying column and be connected except argon column, except the top of argon column is connected with the condensation side entrance except argon column condenser, is connected with two-stage rectification tower except argon column condenser evaporation side, removes argon column condenser condensation side respectively with waste gas argon delivery pipe with remove argon column and be connected.
In this device, can increase except argon column, the described argon column that removes is connected with two-stage rectification tower by pipeline, to reduce the interference of argon to system.
Good effect of the present utility model is embodied in:
(1), the further rectifying of oxygen enriched liquid cut to two-stage rectification tower by auxiliary oxygen rectifying column, thereby obtain the low purity oxygen of required purity, by regulating the evaporation load of low pressure two-stage rectification tower and oxygen rectifying column, realize the pressure that reduces the air inlet of one-level rectifying column, reach thereby reduce feed gas compressor row pressure the object that reduces air separation unit energy consumption.
(2), the present invention has process organization and optimizes, simple, equipment investment cost is low, raw gas pressure is low, Energy Intensity Reduction outstanding feature.
(3), can effectively reduce raw gas pressure, reduce energy consumption, the novel flow process of easy and simple to handle, auxiliary tower low-pressure distillation method acquisition low purity oxygen, employing this programme Deep Cooling Method also can obtain pressure pure nitrogen gas or low pressure purity nitrogen simultaneously simultaneously and liquid form product is stored as for subsequent use, these are similar with empty point of routine, no longer statement.Can replace VPSA, reduce nitrogen oxide, PM2.5, greenhouse effects, have very important significance to energy-saving, emission-reducing, environment friendly.
Brief description of the drawings
Fig. 1 is the structural representation of the low purity oxygen device for making with auxiliary distillation column in embodiment 1;
Fig. 2 is the structural representation of the low purity oxygen device for making with auxiliary distillation column in embodiment 2;
Fig. 3 is the structural representation of the low purity oxygen device for making with auxiliary distillation column in embodiment 3.
Wherein, in figure, be labeled as:
One-level rectifying column---C1, two-stage rectification tower---C2, auxiliary oxygen rectifying column------C4, condenser/evaporator---K1, the auxiliary oxygen rectifying column evaporimeter---K2, except argon column condenser---K4, liquid air liquid nitrogen subcooler---E2, oxygen pump---OP of C3, except argon column.
Detailed description of the invention
Below in conjunction with Figure of description and specific embodiment, the utility model is described in further detail.
Embodiment 1:
The present embodiment is applicable to the oxygenerator with Low Pressure Oxygen purity lower (general purity is below 94.5%),
Concrete operating procedure is:
A) expanded air that low-temperature receiver is provided and participates in rectifying enters two-stage rectification tower C2.
B) an air part that approaches liquefaction point is sent into one-level rectifying column C1, and remainder is sent into the condensation side entrance of oxygen auxiliary distillation column evaporimeter K2, and liquid air exports out from K2 condensation side, then sends into one-level rectifying column C1 bottom.
C) in rectifying column C1, gas from below to up carries out heat and mass with top-down liquid on column plate or filler; Through rectifying washing, more up in column plate, the heavy constituent of liquid air is fewer.Rectifying column C1 Base top contact part nitrogen is sent into the condensation side entrance of condenser/evaporator K1, nitrogen is condensed into liquid nitrogen and draws from condensation side outlet, a part is back to rectifying column C1 and participates in rectifying, and a part is sent into rectifying column C2 and participated in rectifying after liquid air liquid nitrogen subcooler E2 is cooling.Rectifying column C1 middle and lower part soiling solution sky is sent into rectifying column C2 and is participated in rectifying after liquid air liquid nitrogen subcooler E2 is cooling.The liquid air of rectifying column C1 bottom is sent into rectifying column C2 and is participated in rectifying after liquid air liquid nitrogen subcooler E2 is cooling.
D) in rectifying column C2, gas from below to up carries out heat and mass with top-down liquid on filler; Through rectifying washing, in pressure rectifying column, heavy constituent is washed down, and more up heavy constituent is fewer.Rectifying column C2 top after the preliminary re-heat of liquid air liquid nitrogen subcooler E2, is drawn E2 at the nitrogen of drawing.The oxygen enrichment cut that rectifying column C2 draws bottom is sent into auxiliary oxygen rectifying column C3.
E) in rectifying column C3, gas from below to up carries out heat and mass with liquid from bottom to top on filler, and through rectifying washing, the oxygen rich gas of rectifying column C3 Base top contact returns to rectifying column C2 and participates in rectifying.The lower purity oxygen of rectifying column C3 bottom is drawn.
Embodiment 2:
The present embodiment be applicable to oxygen purity be the oxygenerator below 96.5%, concrete operating procedure is:
A) expanded air that low-temperature receiver is provided and participates in rectifying enters two-stage rectification tower C2.
B) an air part that approaches liquefaction point is sent into one-level rectifying column C1, and remainder is sent into oxygen auxiliary distillation column evaporimeter K2 condensation side entrance, and liquid air exports out from K2 condensation side, then sends into one-level rectifying column C1 bottom.
Wherein mainly change liquid air into the pressurized air of low pure liquid oxygen heat exchange and enter one-level rectifying column, the auxiliary low pure liquid oxygen of oxygen rectifying column evaporimeter poor or liquid oxygen pump supercharging and heat exchange of pressurized air heat exchanger through liquid level, i.e. low pure liquid oxygen self-pressurized or interior compressed boil-off re-heat obtains the low pure gas oxygen of pressure, by heat exchange, pressurized air changes liquid air into.Low purity oxygen compresses similar in supercharging or pump from supercharging or interior compression and conventional empty point oxygen, statement no longer in detail.
When required low purity oxygen pressure lower, when oxygen purity is higher, pressurized air that also can be above-mentioned, and adopt the raw air heat exchange identical with one-level rectifying column bottom.
C) in rectifying column C1, gas from below to up carries out heat and mass with top-down liquid on column plate or filler; Through rectifying washing.Rectifying column C1 Base top contact part nitrogen is sent into the condensation side entrance of condenser/evaporator K1, nitrogen is condensed into liquid nitrogen and draws from condensation side outlet, a part is back to rectifying column C1 and participates in rectifying, and a part is sent into rectifying column C2 and participated in rectifying after liquid air liquid nitrogen subcooler E2 is cooling.Rectifying column C1 middle and lower part soiling solution sky is sent into rectifying column C2 and is participated in rectifying after liquid air liquid nitrogen subcooler E2 is cooling.The liquid air of rectifying column C1 bottom is sent into rectifying column C2 and is participated in rectifying after liquid air liquid nitrogen subcooler E2 is cooling.
D) in rectifying column C2, gas from below to up carries out heat and mass with top-down liquid on filler; Through rectifying washing, in pressure rectifying column, heavy constituent is washed down, and more up heavy constituent is fewer.Rectifying column C2 top after the preliminary re-heat of liquid air liquid nitrogen subcooler E2, is drawn E2 at the nitrogen of drawing.The oxygen enrichment cut that rectifying column C2 draws bottom is sent into auxiliary oxygen rectifying column C3.
E) in rectifying column C3, gas from below to up carries out heat and mass with liquid from bottom to top on filler, and through rectifying washing, the oxygen rich gas of rectifying column C3 Base top contact returns to rectifying column C2 and participates in rectifying.
F) the low pure liquid oxygen of rectifying column C3 bottom is drawn by hydrostatic column or pump OP and is sent in the heat exchanger with pressurized air heat exchange.Low pure vaporization of liquid oxygen re-heat becomes the low pure gas oxygen of pressure.Pressurized air liquefaction enters the rectifying of one-level rectifying column for liquid air.
G) when required low purity oxygen pressure is lower, when oxygen purity is higher, pressurized air that also can be above-mentioned, and adopt the raw air heat exchange identical with one-level rectifying column bottom.
Embodiment 3:
The present embodiment is applicable to oxygen purity higher (generally containing oxygen more than 96.6%) oxygenerator, and concrete operating procedure is:
A) air that low-temperature receiver is provided and participates in rectifying enters two-stage rectification tower C2.
B) an air part that approaches liquefaction point is sent into one-level rectifying column C1, and it is auxiliary that remainder is sent into oxygen
Help rectifying column evaporimeter K2 condensation side entrance, liquid air exports out from K2 condensation side, then sends into one-level rectifying column C1 bottom.Then send into one-level rectifying column C1 bottom.
Wherein mainly change liquid air into the pressurized air of low pure liquid oxygen heat exchange and enter one-level rectifying column, the auxiliary low pure liquid oxygen of oxygen rectifying column evaporimeter poor or liquid oxygen pump supercharging and heat exchange of pressurized air heat exchanger through liquid level, i.e. low pure liquid oxygen self-pressurized or interior compressed boil-off re-heat obtains the low pure gas oxygen of pressure; By heat exchange, pressurized air changes liquid air into.Low purity oxygen compresses similar in supercharging or pump from supercharging or interior compression and conventional empty point oxygen, statement no longer in detail.
C) in rectifying column C1, gas from below to up carries out heat and mass with top-down liquid on column plate or filler; Through rectifying washing, more up in column plate, the heavy constituent of liquid air is fewer.Rectifying column C1 Base top contact part nitrogen is sent into the condensation side entrance of condenser/evaporator K1, nitrogen is condensed into liquid nitrogen and draws from condensation side outlet, a part is back to rectifying column C1 and participates in rectifying, and a part is sent into rectifying column C2 and participated in rectifying after liquid air liquid nitrogen subcooler E2 is cooling.Rectifying column C1 middle and lower part soiling solution sky is sent into rectifying column C2 and is participated in rectifying after liquid air liquid nitrogen subcooler E2 is cooling.The liquid air of rectifying column C1 bottom is sent into rectifying column C2 through the cooling rear portion of liquid air liquid nitrogen subcooler E2 and is participated in rectifying, and another part is sent into the evaporation side except argon column condenser K4.
D) in rectifying column C2, gas from below to up carries out heat and mass with top-down liquid on filler; Through rectifying washing, in rectifying column, heavy constituent is washed down, and more up heavy constituent is fewer.Rectifying column C2 top after the preliminary re-heat of liquid air liquid nitrogen subcooler E2, is drawn E2 at the nitrogen of drawing.The oxygen enrichment cut that rectifying column C2 draws bottom is sent into auxiliary oxygen rectifying column C3.
E) rectifying column C3 side line draw rich argon cut send into except argon column C4 participate in rectifying.Carrying out heat and mass with liquid from bottom to top except gas from below to up in argon column C4 on filler, through rectifying washing, the gas at rectifying column C4 top is sent into the condensation side entrance except argon column condenser K4, after condensation, liquid backflow participates in rectifying to rectifying column C4, and the useless argon gas that is not condensed into liquid is drawn.Except argon column condenser Base top contact boil-off gas.
F) in rectifying column C3, gas from below to up carries out heat and mass with liquid from bottom to top on filler, and through rectifying washing, the oxygen rich gas of rectifying column C3 Base top contact returns to rectifying column C2 and participates in rectifying.The low pure liquid oxygen of rectifying column C3 bottom is drawn the evaporation side of sending into liquid oxygen evaporator E1.
G) the low pure liquid oxygen of rectifying column C3 bottom is drawn by hydrostatic column or pump OP and is sent in the heat exchanger with pressurized air heat exchange.Low pure vaporization of liquid oxygen re-heat becomes the low pure gas oxygen of pressure; Pressurized air liquefaction enters the rectifying of one-level rectifying column for liquid air.
H) when required low purity oxygen pressure is lower, when oxygen purity is higher, pressurized air that also can be above-mentioned, and adopt the raw air heat exchange identical with one-level rectifying column bottom.
The utility model is by taking to control to adjust the load of condenser/evaporator K1 and evaporimeter K2, thereby reaches the object that reduces raw air pressure.Enforcement is simple, effect is remarkable, energy consumption is low, has the feature of maximization of economic benefit, increase the smallest investment, significant, is worthy to be popularized.
The utility model is not limited to aforesaid detailed description of the invention.The utility model expands to any new feature or any new combination disclosing in this manual, and the arbitrary new method disclosing or step or any new combination of process.Step in this description in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.Disclosed arbitrary feature in this description (comprising any accessory claim, summary and accompanying drawing), unless narration especially all can be replaced by other equivalences or the alternative features with similar object.Unless i.e. narration especially, each feature is an example in a series of equivalences or similar characteristics.

Claims (7)

1. the low purity oxygen device for making with auxiliary distillation column, this device comprises one-level rectifying column (C1), two-stage rectification tower (C2), condenser/evaporator (K1), liquid air liquid nitrogen subcooler (E2), auxiliary oxygen rectifying column (C3) and auxiliary oxygen rectifying column evaporimeter (K2), is characterized in that: the expanded air that low-temperature receiver is provided and participates in rectifying is connected with two-stage rectification tower (C2) by airflow pipe; The raw air that approaches liquefaction point is connected with the condensation end entrance of one-level rectifying column (C1) and auxiliary oxygen rectifying column evaporimeter (K2) respectively by airflow pipe; The bottom of two-stage rectification tower (C2) is connected with auxiliary oxygen rectifying column (C3), the liquid air outlet of one-level rectifying column (C1) bottom is connected with liquid air liquid nitrogen subcooler (E2) and two-stage rectification tower (C2) respectively, between one-level rectifying column (C1) and two-stage rectification tower (C2), condenser/evaporator (K1) is set, auxiliary oxygen rectifying column (C3) is connected with auxiliary oxygen rectifying column evaporimeter (K2).
2. the low purity oxygen device for making with auxiliary distillation column according to claim 1, it is characterized in that: this device also comprises oxygen pump (OP) and liquid air entrance, liquia air is connected with one-level rectifying column (C1) by airflow pipe, the low pure liquid oxygen of rectifying column C3 bottom is connected with oxygen pump (OP) by pipeline, then discharges.
3. the low purity oxygen device for making with auxiliary distillation column according to claim 2, it is characterized in that: this device also comprises except argon column (C4) with except argon column condenser (K4), assist oxygen rectifying column (C3) and be connected except argon column (C4), except the top of argon column (C4) is connected with the condensation side entrance except argon column condenser (K4), except the evaporation side of argon column condenser (K4) is connected with auxiliary oxygen rectifying column (C3), the condensation side of removing argon column condenser (K4) is respectively with waste gas argon discharge tube with remove argon column (C3) and be connected.
According to claim 1 to the low purity oxygen device for making with auxiliary distillation column described in any one claim in claim 3, it is characterized in that: the nitrogen outlet at the top of described one-level rectifying column (C1) is connected with the condensation side of condenser/evaporator (K1).
According to claim 1 to the low purity oxygen device for making with auxiliary distillation column described in any one claim in claim 3, it is characterized in that: the liquid nitrogen outlet of described condenser/evaporator (K1) condensation side is connected with two-stage rectification tower (C2) by liquid air liquid nitrogen subcooler (E2), and liquid air liquid nitrogen subcooler (E2) is connected with one-level rectifying column (C1).
According to claim 1 to the low purity oxygen device for making with auxiliary distillation column described in any one claim in claim 3, it is characterized in that: the dirty Air Export of liquid of described one-level rectifying column (C1) middle and lower part is connected with two-stage rectification tower (C2) by liquid air liquid nitrogen subcooler (E2).
According to claim 1 to the low purity oxygen device for making with auxiliary distillation column described in any one claim in claim 3, it is characterized in that: the nitrogen outlet at described two-stage rectification tower (C2) top is connected with liquid air liquid nitrogen subcooler (E2), heat exchanger (E1) and nitrogen discharge pipeline respectively, the oxygen outlet of two-stage rectification tower (C2) bottom is connected with low pure gas oxygen discharge pipe.
CN201420045405.2U 2014-01-24 2014-01-24 Low-purity oxygen preparing device with auxiliary rectifying tower Active CN203687518U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105910388A (en) * 2016-06-03 2016-08-31 开封黄河空分集团有限公司 Air separation device and air separation method
CN112041626A (en) * 2018-04-25 2020-12-04 普莱克斯技术有限公司 System and method for enhanced recovery of argon and oxygen from nitrogen-producing cryogenic air separation units

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105910388A (en) * 2016-06-03 2016-08-31 开封黄河空分集团有限公司 Air separation device and air separation method
CN112041626A (en) * 2018-04-25 2020-12-04 普莱克斯技术有限公司 System and method for enhanced recovery of argon and oxygen from nitrogen-producing cryogenic air separation units

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