CN219178124U - Air separation refrigerating system - Google Patents

Air separation refrigerating system Download PDF

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Publication number
CN219178124U
CN219178124U CN202223595894.2U CN202223595894U CN219178124U CN 219178124 U CN219178124 U CN 219178124U CN 202223595894 U CN202223595894 U CN 202223595894U CN 219178124 U CN219178124 U CN 219178124U
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China
Prior art keywords
air
control valve
expander
supercharger
refrigeration system
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CN202223595894.2U
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Chinese (zh)
Inventor
李建刚
段傲男
师阳
卫涛
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Hancheng Xinfeng Clean Energy Technology Co ltd
Shaanxi Heimao Coking Co ltd
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Hancheng Xinfeng Clean Energy Technology Co ltd
Shaanxi Heimao Coking Co ltd
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Priority to CN202223595894.2U priority Critical patent/CN219178124U/en
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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
    • F25J3/04812—Different modes, i.e. "runs" of operation
    • F25J3/04818—Start-up of the process
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04781—Pressure changing devices, e.g. for compression, expansion, liquid pumping
    • 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
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/40—Processes or apparatus involving steps for increasing the pressure of gaseous process streams the fluid being air
    • 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
    • F25J2240/00—Processes or apparatus involving steps for expanding of process streams
    • F25J2240/02—Expansion of a process fluid in a work-extracting turbine (i.e. isentropic expansion), e.g. of the feed stream
    • F25J2240/10—Expansion of a process fluid in a work-extracting turbine (i.e. isentropic expansion), e.g. of the feed stream the fluid being air
    • 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/40—Processes or apparatus involving steps for recycling of process streams the recycled stream being air

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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 belongs to the technical field of air separation, and relates to an air separation refrigerating system, which comprises an air main pipe, a supercharger, a heat exchanger, an expander and a first control valve; the air main pipe is divided into two paths, and one path is communicated with the expansion machine through the heat exchanger; the other path is communicated with the heat exchanger through a supercharger and a first control valve; the supercharger is connected with the expander and further comprises a third control valve, and the supercharger is communicated with the heat exchanger through the third control valve. The utility model provides an air separation refrigerating system, which improves refrigerating efficiency, saves air separation driving time and achieves the purposes of energy conservation and consumption reduction.

Description

Air separation refrigerating system
Technical Field
The utility model belongs to the technical field of air separation, and relates to an air separation refrigerating system.
Background
Air separation refers to a process of separating components (oxygen, nitrogen, rare gases such as argon and helium) from air by using a low-temperature freezing principle, and is generally carried out by compressing air and cooling the air to a very low temperature, or liquefying the air by an expansion method, and then separating the air in a rectifying tower. Therefore, air separation refrigeration is an important link in the air separation process, the existing air separation refrigeration mainly runs by an expansion unit, the internal energy of equipment is converted into mechanical energy, and the air temperature can be reduced to achieve the refrigeration effect, but the following problems exist:
(1) The refrigerating capacity of one unit in the existing air separation refrigeration can meet the production requirement, but the required refrigerating capacity is larger in the front stage of the air separation refrigeration, and under the condition that the two units are required to be fully loaded under the limit of the refrigerating capacity of an expansion mechanism, the cooling of driving is completed in more running time, the time of the air separation refrigeration is long, and the efficiency is low;
(2) The existing expansion unit is generally configured with a small air separation device, and all the gas which is acted by a booster enters the expansion machine, but in operation, the unit refrigerating capacity is smaller as the temperature after the expansion machine is high, the refrigerating effect is poor, and the unit can possibly have the phenomena of surge and decompression, so that the stable operation of the system is influenced.
Disclosure of Invention
Aiming at the technical problems of long driving time and low refrigerating effect of the existing air separation refrigeration, the utility model provides an air separation refrigeration system, which improves the refrigerating efficiency, saves the air separation driving time and achieves the aims of energy conservation and consumption reduction.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
an air-separation refrigeration system comprises an air main, a supercharger, a heat exchanger, an expander and a first control valve; the air main pipe is divided into two paths, and one path is communicated with the expansion machine through the heat exchanger; the other path is communicated with the heat exchanger through a supercharger and a first control valve; the supercharger is connected with the expander.
Further, the air separation refrigeration system further comprises a third control valve, and the supercharger is communicated with the heat exchanger through the third control valve.
Further, the air separation refrigeration system further comprises a first discharge pipeline communicated with the supercharger, and the first discharge pipeline is respectively communicated with the first control valve and the third control valve.
Further, the air separation refrigeration system further comprises a second control valve arranged on the first discharge pipeline, and the second control valve is positioned at the rear end of the third control valve and the rear end of the first control valve.
Further, the two paths of the air main pipe are a first branch pipe and a second branch pipe respectively, the second branch pipe is communicated with the expansion machine through the heat exchanger, the first branch pipe is communicated with the supercharger, and the first control valve and the third control valve are also communicated with the second branch pipe.
Further, the working parameters of the supercharger are as follows: the air inlet pressure is 0.45Mpa, the outlet pressure is 0.58Mpa, the rotating speed is 13500r/min-14500r/min, and the working gas volume is 26000Nm 3 。
Further, the third control valve is an adjustable valve.
Further, the air separation refrigeration system also comprises a second discharge pipeline communicated with the expander.
Further, the expander is a single-stage centripetal radial flow reaction type expander.
The beneficial effects of the utility model are as follows:
1. according to the utility model, a part of compressed gas after the booster is used for working is introduced into the expander for secondary working refrigeration after passing through the heat exchanger, the amount of gas entering the expander for working is increased, the front pressure of the expander is increased, the unit refrigerating capacity is increased, the refrigerating effect is improved, the air separation driving time is saved, and the energy and consumption are reduced.
2. According to the utility model, the air outlet amount of the supercharger is gradually increased by adjusting the opening degree of the second control valve, so that the rotating speed of the unit is reduced, the vehicle jump caused by the overhigh rotating speed of the expander is prevented, and the stable operation of the unit is ensured.
3. In the utility model, the first control valve and the third control valve are regulated according to the rotating speed of the unit and the temperature after refrigerationThe air inlet of the expander and the air inlet of the supercharger are controlled to 25000Nm 3 The air flow into the expander after adjustment is 18000Nm 3 And the unit refrigeration efficiency is ensured to be maximized.
Drawings
FIG. 1 is a schematic diagram of an air separation refrigeration system provided by the present utility model;
wherein:
1-a first branch pipe; 2-a second branch pipe; 3-a supercharger; 4-a heat exchanger; 5-an expander; 6-a first control valve; 7-a second control valve; 8-a third control valve.
Detailed Description
The utility model will now be described in detail with reference to the drawings and examples.
Referring to fig. 1, the air separation refrigeration system includes an air main, a supercharger 3, a heat exchanger 4, an expander 5, and a first control valve 6.
The air main pipe is divided into two paths, and one path is communicated with the expander 5 through the heat exchanger 4; the other path is communicated with the heat exchanger 4 through the supercharger 3 and the first control valve 6.
In this embodiment, the heat exchanger 4 has a plate-fin structure, the heat exchange medium has a gas-liquid two-phase structure, the gas phase is air, and the liquid phase is water phase.
The air-separation refrigeration system further comprises a third control valve 8, and the supercharger 3 is communicated with the heat exchanger 4 through the third control valve 8. The air-separation refrigeration system further comprises a first discharge line in communication with the supercharger 3, which is in communication with the first control valve 6 and the third control valve 8, respectively. The air-separation refrigeration system further comprises a second control valve 7 arranged on the first discharge pipe, wherein the second control valve 7 is positioned at the rear end of the third control valve 8 and the rear end of the first control valve 6.
Specifically, two paths of the air main pipe are a first branch pipe 1 and a second branch pipe 2 respectively, and the second branch pipe 2 is communicated with the expansion machine 5 through the heat exchanger 4; the first branch pipe 1 is communicated with the supercharger 3, and is divided into three paths after passing through the supercharger 3, wherein the first path is converged into the second branch pipe 2 through the first control valve 6 and enters the heat exchanger 4, and the second path is converged into the second branch pipe 2 through the third control valve 8 and enters the heat exchanger 4; the third path enters the first outlet pipeline through the second control valve 7.
The first control valve 6, the third control valve 8 and the second control valve 7 are arranged in this order along the discharge line of the supercharger 3. The third control valve 8 is an adjustable valve.
The supercharger 3 is connected with the expander 5, and the supercharger 3 works to drive the expander 5 to operate. The expander 5 is a single-stage centripetal radial flow reaction expander.
The operating parameters of the supercharger 3 are: the air inlet pressure is 0.45Mpa, the outlet pressure is 0.58Mpa, the rotating speed is 13500r/min-14500r/min, and the working gas volume is 26000Nm 3 。
The air separation refrigeration system further includes a second discharge line in communication with the expander 5.
Purified air with the pressure of 0.45Mpa enters the heat exchanger 4 from the second branch pipe 2, enters the expander 5 from the heat exchanger 4 for working and refrigerating, and is sent to the rectifying system from the second discharge pipeline.
Purified air with the pressure of 0.45Mpa enters a booster 3 from a first branch pipe 1 to apply work, the purified air is pressurized to 0.57Mpa from 0.45Mpa, then part of the purified air is converged into a second branch pipe 2 through a first control valve 6, the purified air is mixed with the purified air and enters a heat exchanger 4, the heat exchanger 4 enters an expander 5 to perform work and refrigeration, the second discharge pipeline is used for sending the purified air to a rectification system, and the other part of the purified air is directly sent to the rectification system from the first discharge pipeline.
The specific operation is as follows: before the engine is started, the first control valve 6 is opened, the second control valve 7 is closed, the pressurized air (the pressure is 0.57 Mpa) is fully mixed with the purified air (the pressure is 0.45 Mpa), the mixture enters the inlet of the expander 5 after heat exchange is carried out on the mixture by the heat exchange 4, the acting air quantity is increased, the cooling speed and the refrigerating efficiency of the expander can be improved, and the starting time is saved.
When the rotation speed of the expander 5 is about 95% of the skip value, the third control valve 8 added beside the first control valve 6 is used for regulating the stability of the air quantity so as to control the air quantity of the expander and the air quantity of the supercharger, and the air quantity of the supercharger is 25000Nm 3 The air flow into the expander after adjustment is 18000Nm 3 And the refrigerating efficiency is improved.
For example, when the rotation speed of the expander 5 exceeds 95% of the trip value, the opening of the third control valve 8 is properly adjusted to be slightly opened, the air outlet amount of the supercharger 3 is gradually increased, the rotation speed of the unit is reduced, the air inlet is regulated to be stable, the excessive high rotation speed is prevented, the temperature after the expander is high, the unit is caused to surge or lose pressure, and the stable operation of the system is ensured.
After the operation of driving is stable, because the expansion amount requirement of the expander 5 is lower than that in the driving period, the second control valve 7 is opened, the first control valve 6 is closed, the third control valve 8 is slightly opened for regulation and control, the air inlet of the expander and the air inlet amount of the booster are controlled, and the maximum refrigerating efficiency of the unit is ensured.
According to the air separation refrigeration system, the pressure in front of the expander 5 is increased from original 0.45Mpa to 0.57Mpa; the front pressure of the expander is increased, the working gas quantity is increased, the larger the front pressure drop and the rear pressure drop of the expander are, the larger the unit refrigerating capacity generated by the expander 5 is, the cooling speed of the expander 5 can be increased, the refrigerating efficiency is improved, and the method is suitable for an air separation external compression system.

Claims (9)

1. An air-separation refrigeration system is characterized by comprising an air main, a supercharger (3), a heat exchanger (4), an expander (5) and a first control valve (6); the air main pipe is divided into two paths, and one path is communicated with the expansion machine (5) through the heat exchanger (4); the other path is communicated with the heat exchanger (4) through the booster (3) and the first control valve (6); the supercharger (3) is connected to the expander (5).
2. An air-separation refrigeration system according to claim 1, characterized in that the air-separation refrigeration system further comprises a third control valve (8), the supercharger (3) being in communication with the heat exchanger (4) via the third control valve (8).
3. An air-separation refrigeration system according to claim 2, characterized in that it further comprises a first discharge line communicating with the supercharger (3), said first discharge line being in communication with the first control valve (6) and with the third control valve (8), respectively.
4. An air-separation refrigeration system according to claim 3, characterized in that the air-separation refrigeration system further comprises a second control valve (7) placed on the first discharge line, the second control valves (7) being located both at the rear end of the third control valve (8) and at the rear end of the first control valve (6).
5. An air-separation refrigeration system according to claim 4, wherein the two paths of the air main are a first branch pipe (1) and a second branch pipe (2), the second branch pipe (2) is communicated with the expander (5) through the heat exchanger (4), the first branch pipe (1) is communicated with the supercharger (3), and the first control valve (6) and the third control valve (8) are also communicated with the second branch pipe (2).
6. An air-separation refrigeration system according to any of claims 2-5, characterized in that the operating parameters of the supercharger (3) are: the air inlet pressure is 0.45Mpa, the outlet pressure is 0.58Mpa, the rotating speed is 13500r/min-14500r/min, and the working gas volume is 26000Nm 3 。
7. An air-separation refrigeration system according to claim 6, characterized in that the third control valve (8) is an adjustable valve.
8. An air-separation refrigeration system according to claim 7, characterized in that the air-separation refrigeration system further comprises a second discharge line communicating with the expander (5).
9. An air-separation refrigeration system according to claim 8, characterized in that said expander (5) is a single-stage centripetal radial flow reaction expander.
CN202223595894.2U 2022-12-30 2022-12-30 Air separation refrigerating system Active CN219178124U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202223595894.2U CN219178124U (en) 2022-12-30 2022-12-30 Air separation refrigerating system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202223595894.2U CN219178124U (en) 2022-12-30 2022-12-30 Air separation refrigerating system

Publications (1)

Publication Number Publication Date
CN219178124U true CN219178124U (en) 2023-06-13

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Application Number Title Priority Date Filing Date
CN202223595894.2U Active CN219178124U (en) 2022-12-30 2022-12-30 Air separation refrigerating system

Country Status (1)

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CN (1) CN219178124U (en)

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