CN214065438U - Air separation device adopting pressure nitrogen to spray liquid nitrogen from lower tower to enter upper tower - Google Patents

Air separation device adopting pressure nitrogen to spray liquid nitrogen from lower tower to enter upper tower Download PDF

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Publication number
CN214065438U
CN214065438U CN202022624179.1U CN202022624179U CN214065438U CN 214065438 U CN214065438 U CN 214065438U CN 202022624179 U CN202022624179 U CN 202022624179U CN 214065438 U CN214065438 U CN 214065438U
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China
Prior art keywords
nitrogen
subcooler
fixedly connected
tower
liquid nitrogen
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Application number
CN202022624179.1U
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Chinese (zh)
Inventor
王海跃
王仁保
金志�
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Zhejiang Haichang Gas Co ltd
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Zhejiang Haichang Gas Co ltd
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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
    • F25J3/04406—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
    • F25J3/04412—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
    • 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
    • F25J3/04793—Rectification, e.g. columns; Reboiler-condenser
    • 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
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/42—Nitrogen
    • 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
    • F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/06—Lifting of liquids by gas lift, e.g. "Mammutpumpe"

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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 utility model relates to an adopt pressure nitrogen to spray lower tower liquid nitrogen and advance air separation plant of upper column, including lower tower main part, the top of lower tower main part is provided with the condensation evaporimeter, the top of condensation evaporimeter is provided with upper column main part, the bottom fixedly connected with liquid nitrogen back flow of condensation evaporimeter, the one end that the condensation evaporimeter was kept away from to the liquid nitrogen back flow is connected with the subcooler, the liquid nitrogen back flow is through subcooler and upper column main part fixed connection, the bottom fixedly connected with liquid air back flow of lower tower main part, the one end that lower tower main part was kept away from to the liquid air back flow is connected with the subcooler, the liquid air back flow is through subcooler and upper column main part fixed connection, fixedly connected with nitrogen gas output tube in the upper column main part. In short, the technical scheme of the application utilizes a coherent and compact structure, and solves the problems that the lower tower pressure is high, the exhaust pressure of an air compressor is large and the yield of an air separation plant is insufficient in the using process of the traditional air separation plant.

Description

Air separation device adopting pressure nitrogen to spray liquid nitrogen from lower tower to enter upper tower
Technical Field
The utility model relates to an empty technical field that divides, concretely relates to adopt pressure nitrogen to spray lower tower liquid nitrogen and advance air separation plant of last tower.
Background
An air separation device, which is a set of industrial equipment for separating each component gas in air to produce oxygen, nitrogen and argon, comprises an air filtration system, an air compressor system, an air precooling system, an air purification system, an expansion system, an air separation system and the like, wherein the air separation system for separating nitrogen and oxygen consists of a rectifying tower system, liquid air, liquid nitrogen and dirty liquid nitrogen of a lower tower enter an upper tower by virtue of the differential pressure of the upper tower and the lower tower, and the liquid of the lower tower can enter the upper tower to participate in rectification after the upper tower and the lower tower reach a certain differential pressure, so that the lower tower pressure is lower, the lower tower pressure can be correspondingly reduced, the higher the upper tower pressure is, the lower tower pressure is correspondingly improved, but the lower the upper tower pressure is better, if too low, the dirty nitrogen, nitrogen and oxygen of the upper tower cannot overcome the pipeline resistance and are discharged out of the tower, and how to reduce the lower tower pressure, reducing the energy consumption of air separation equipment becomes the research direction, and at present, the air separation equipment used in the technical field of air separation has the following disadvantages:
the lower tower pressure of the traditional air separation device adopting pressure nitrogen to spray lower tower liquid nitrogen into an upper tower is higher, the exhaust pressure of a corresponding air compressor is large, the energy consumption is higher, the exhaust volume of the air compressor is reduced, and the yield of the air separation device is reduced;
therefore, the design of the novel air separation equipment which can reduce the pressure of the lower tower, simultaneously reduce the exhaust pressure of the air compressor and improve the yield of the air separation equipment is urgently needed in the technical field of air separation at present.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing an adopt pressure nitrogen to spray lower tower liquid nitrogen and advance air separation plant of last tower to solve the lower tower pressure height that prior art traditional air separation plant exists in the use, the big and insufficient problem of air separation plant output of air compressor machine exhaust pressure simultaneously.
The utility model discloses a following technical scheme realizes:
an air separation device adopting pressure nitrogen to spray lower tower liquid nitrogen into an upper tower comprises a lower tower main body, wherein a condensation evaporator is arranged at the top end of the lower tower main body, an upper tower main body is arranged at the top end of the condensation evaporator, a liquid nitrogen return pipe is fixedly connected to the bottom end of the condensation evaporator, a subcooler is connected to one end, away from the condensation evaporator, of the liquid nitrogen return pipe, the liquid nitrogen return pipe is fixedly connected with the upper tower main body through the subcooler, a liquid air return pipe is fixedly connected to the bottom of the lower tower main body, one end, away from the lower tower main body, of the liquid air return pipe is connected with the subcooler, the liquid air return pipe is fixedly connected with the upper tower main body through the subcooler, a nitrogen output pipe is fixedly connected to the upper tower main body, one end, away from the upper tower main body, of the nitrogen output pipe is connected with the subcooler, and the nitrogen output pipe is fixedly connected with a main heat exchanger through the subcooler, go up fixedly connected with dirty nitrogen output tube in the tower main part, the one end that dirty nitrogen output tube kept away from the tower main part is connected with the subcooler, dirty nitrogen output tube is through subcooler and fixedly connected with main heat exchanger, go up fixedly connected with oxygen output tube in the tower main part, the one end fixedly connected with main heat exchanger of tower main part is kept away from to the oxygen output tube, fixedly connected with air input tube on the main heat exchanger, the one end that main heat exchanger was kept away from to the air input tube is with lower tower main part fixed connection.
Further, a second valve is arranged on a liquid nitrogen return pipe between the subcooler and the upper tower main body.
Furthermore, a branch pipe is arranged on a liquid nitrogen return pipe between the subcooler and the condensing evaporator, and one end of the branch pipe, which is far away from the liquid nitrogen return pipe, is fixedly connected with the lower tower main body.
Furthermore, a third valve is arranged on a liquid-air return pipe between the subcooler and the upper tower main body.
Furthermore, an external pressure nitrogen input pipe is arranged on a liquid nitrogen return pipe between the upper tower main body and the second valve, and a first valve is arranged on the external pressure nitrogen input pipe.
The beneficial effects of the utility model reside in that:
this adopt pressure nitrogen to spray air separation plant that lower tower liquid nitrogen advances to last tower increases the ambient pressure nitrogen gas input tube of the same kind to the liquid nitrogen pipeline of upper tower through lower tower, utilizes pressure nitrogen gas to spray the principle and drive lower tower liquid nitrogen and carry to the upper tower, provides kinetic energy for the liquid nitrogen, reduces lower tower pressure, and corresponding air compressor machine exhaust pressure reduces, reduces the energy consumption, and the displacement of air compressor machine increases simultaneously, improves air separation plant's output.
In short, the technical scheme of the application utilizes a coherent and compact structure, and solves the problems that the lower tower pressure is high, the exhaust pressure of an air compressor is large and the yield of an air separation plant is insufficient in the using process of the traditional air separation plant.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: 1. an ambient pressure nitrogen input pipe; 2. a subcooler; 3. an upper tower main body; 4. a lower tower body; 5. a nitrogen gas output pipe; 6. an oxygen output pipe; 7. a waste nitrogen output pipe; 8. an air input pipe; 9. a primary heat exchanger; 10. a liquid-air return pipe; 11. a condensing evaporator; 12. a liquid nitrogen return pipe; 13. a first valve; 14. a second valve; 15. a third valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the above description of the present invention, it should be noted that the terms "one side" and "the other side" are used for indicating the position or the positional relationship based on the position or the positional relationship shown in the drawings, or the position or the positional relationship which is usually placed when the product of the present invention is used, only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the indicated device or element must have a specific position, be constructed and operated in a specific position, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Further, the term "identical" and the like do not mean that the components are absolutely required to be identical, but may have slight differences. The term "perpendicular" merely means that the positional relationship between the components is more perpendicular than "parallel", and does not mean that the structure must be perfectly perpendicular, but may be slightly inclined.
Referring to fig. 1-1, the present invention provides a technical solution: an air separation device for injecting liquid nitrogen from a lower tower into an upper tower by adopting pressure nitrogen injection comprises a lower tower main body 4, a condensing evaporator 11 is arranged at the top end of the lower tower main body 4, an upper tower main body 3 is arranged at the top end of the condensing evaporator 11, a liquid nitrogen return pipe 12 is fixedly connected at the bottom end of the condensing evaporator 11, a subcooler 2 is connected at one end of the liquid nitrogen return pipe 12 far away from the condensing evaporator 11, the liquid nitrogen return pipe 12 is fixedly connected with the upper tower main body 3 through the subcooler 2, a liquid air return pipe 10 is fixedly connected at the bottom of the lower tower main body 4, a subcooler 2 is connected at one end of the liquid air return pipe 10 far away from the lower tower main body 4, the liquid air return pipe 10 is fixedly connected with the upper tower main body 3 through the subcooler 2, a nitrogen output pipe 5 is fixedly connected on the upper tower main body 3, one end of the nitrogen output pipe 5 far away from the upper tower main body 3 is connected with the subcooler 2, and the nitrogen output pipe 5 is fixedly connected with a main heat exchanger 9 through the subcooler 2, go up fixedly connected with dirty nitrogen output tube 7 on tower main part 3, the one end that dirty nitrogen output tube 7 kept away from tower main part 3 is connected with subcooler 2, dirty nitrogen output tube 7 is through subcooler 2 and fixedly connected with main heat exchanger 9, go up fixedly connected with oxygen output tube 6 on the tower main part 3, the one end fixedly connected with main heat exchanger 9 of last tower main part 3 is kept away from to oxygen output tube 6, fixedly connected with air input tube 8 on main heat exchanger 9, the one end and the lower tower main part 4 fixed connection of main heat exchanger 9 are kept away from to air input tube 8.
The utility model discloses in: a second valve 14 is arranged on a liquid nitrogen return pipe 12 between the subcooler 2 and the upper tower main body 3.
The utility model discloses in: a branch pipe is arranged on a liquid nitrogen return pipe 12 between the subcooler 2 and the condensing evaporator 11, and one end of the branch pipe, which is far away from the liquid nitrogen return pipe 12, is fixedly connected with the lower tower main body 4.
The utility model discloses in: a third valve 15 is arranged on a liquid air return pipe 10 between the subcooler 2 and the upper tower main body 3.
The utility model discloses in: a liquid nitrogen return pipe 12 between the upper tower main body 3 and the second valve 14 is provided with an external pressure nitrogen input pipe 1, and the external pressure nitrogen input pipe 1 is provided with a first valve 13.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims (5)

1. The utility model provides an adopt pressure nitrogen to spray lower column liquid nitrogen and advance air separation plant of last tower, includes lower column body (4), its characterized in that: the tower comprises a lower tower body (4), a condensing evaporator (11) is arranged at the top end of the lower tower body (4), an upper tower body (3) is arranged at the top end of the condensing evaporator (11), a liquid nitrogen return pipe (12) is fixedly connected to the bottom end of the condensing evaporator (11), a subcooler (2) is connected to one end, away from the condensing evaporator (11), of the liquid nitrogen return pipe (12), the liquid nitrogen return pipe (12) is fixedly connected with the upper tower body (3) through the subcooler (2), a liquid air return pipe (10) is fixedly connected to the bottom of the lower tower body (4), one end, away from the lower tower body (4), of the liquid air return pipe (10) is connected with the subcooler (2), the liquid air return pipe (10) is fixedly connected with the upper tower body (3) through the subcooler (2), a nitrogen output pipe (5) is fixedly connected to the upper tower body (3), one end, away from the upper tower body (3), of the nitrogen output pipe (5) is connected with the subcooler (2), nitrogen gas output tube (5) are through subcooler (2) and fixedly connected with main heat exchanger (9), go up fixedly connected with dirty nitrogen output tube (7) on tower main part (3), the one end that last tower main part (3) were kept away from to dirty nitrogen output tube (7) is connected with subcooler (2), dirty nitrogen output tube (7) are through subcooler (2) and fixedly connected with main heat exchanger (9), go up fixedly connected with oxygen output tube (6) on tower main part (3), one end fixedly connected with main heat exchanger (9) of last tower main part (3) are kept away from in oxygen output tube (6), fixedly connected with air input tube (8) are gone up in main heat exchanger (9), the one end and lower tower main part (4) fixed connection of main heat exchanger (9) are kept away from in air input tube (8).
2. An air separation plant for sparging liquid nitrogen from a lower column into an upper column using pressurized nitrogen as claimed in claim 1 wherein: and a second valve (14) is arranged on a liquid nitrogen return pipe (12) between the subcooler (2) and the upper tower main body (3).
3. An air separation plant for sparging liquid nitrogen from a lower column into an upper column using pressurized nitrogen as claimed in claim 1 wherein: and a branch pipe is arranged on a liquid nitrogen return pipe (12) between the subcooler (2) and the condensing evaporator (11), and one end of the branch pipe, which is far away from the liquid nitrogen return pipe (12), is fixedly connected with the lower tower main body (4).
4. An air separation plant for sparging liquid nitrogen from a lower column into an upper column using pressurized nitrogen as claimed in claim 1 wherein: and a third valve (15) is arranged on a liquid-air return pipe (10) between the subcooler (2) and the upper tower main body (3).
5. An air separation plant for sparging liquid nitrogen from a lower column into an upper column using pressurized nitrogen as claimed in claim 2 wherein: and a liquid nitrogen return pipe (12) between the upper tower main body (3) and the second valve (14) is provided with an external pressure nitrogen input pipe (1), and the external pressure nitrogen input pipe (1) is provided with a first valve (13).
CN202022624179.1U 2020-11-13 2020-11-13 Air separation device adopting pressure nitrogen to spray liquid nitrogen from lower tower to enter upper tower Active CN214065438U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202022624179.1U CN214065438U (en) 2020-11-13 2020-11-13 Air separation device adopting pressure nitrogen to spray liquid nitrogen from lower tower to enter upper tower

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022624179.1U CN214065438U (en) 2020-11-13 2020-11-13 Air separation device adopting pressure nitrogen to spray liquid nitrogen from lower tower to enter upper tower

Publications (1)

Publication Number Publication Date
CN214065438U true CN214065438U (en) 2021-08-27

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CN202022624179.1U Active CN214065438U (en) 2020-11-13 2020-11-13 Air separation device adopting pressure nitrogen to spray liquid nitrogen from lower tower to enter upper tower

Country Status (1)

Country Link
CN (1) CN214065438U (en)

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Address after: 317000 No. 755, Dongdu South Road, Linhai City, Taizhou City, Zhejiang Province (for office use only) (self declaration)

Patentee after: Zhejiang Haichang Gas Co.,Ltd.

Address before: 317000 southeast of line A3, Linhai chemical API base, Linhai Park, Taizhou City, Zhejiang Province

Patentee before: ZHEJIANG HAICHANG GAS Co.,Ltd.