CN109724279A - Single-stage throttling single cycle azeotrope refrigeration system and method - Google Patents
Single-stage throttling single cycle azeotrope refrigeration system and method Download PDFInfo
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- CN109724279A CN109724279A CN201711044547.1A CN201711044547A CN109724279A CN 109724279 A CN109724279 A CN 109724279A CN 201711044547 A CN201711044547 A CN 201711044547A CN 109724279 A CN109724279 A CN 109724279A
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- heat exchanger
- azeotrope
- cryogen
- pressure
- liquid phase
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Abstract
The invention discloses a kind of single-stage throttling single cycle azeotrope refrigeration systems, the system includes cryogenic fluid pump, condenser, cryogen knockout drum, pressure regulatory element and heat exchanger between azeotrope suction tank, refrigerant compressor, intercondenser, stage separation tank, grade, the pressure regulatory element is arranged on the cryogen knockout drum gaseous phase outlet to the pipeline between the heat exchanger top entry, for adjusting the pressure of gas phase cryogen.The invention also discloses the single-stage throttling single cycle azeotrope refrigerating methods based on above system.The present invention cancels azeotrope pump, is changed to export to one pressure regulatory element of increase on the pipeline between heat exchanger entrance in cryogen knockout drum, reduces the quantity of rotating machinery in device, to improve the operability of device and the stability of device operation.
Description
Technical field
The present invention relates to chemical fields, more particularly to single-stage throttling single cycle azeotrope refrigeration system and method.
Background technique
Currently, prepared by various refrigeration cycle, there are many LNG Technology, and common there are mainly three types of circulations: stepwise follows
Natural gas temperature is reduced to condensing temperature using the one-component refrigerant and heat exchanger of a variety of gradual arrangements by ring；Expansion system
SAPMAC method makes gas be expanded to low pressure to reduce temperature accordingly from high pressure；Multiple group sub-refrigerating circulation, utilizes multi-component refrigrant
With the heat exchanger liquefied natural gas of Specialty Design.
Traditional single-stage throttling azeotrope refrigeration process belongs to one kind (referring to Fig. 1) of multiple group sub-refrigerating circulation, will mix
Refrigerated separation after conjunction refrigerant compression, gas phase cryogen enter heat exchange after mixing at heat exchanger entrance with liquid phase cryogen together
Device returns to its bottom after heat exchanger bottom is using a J-T valve decompression throttling, and the mixing come out from heat exchanger top is cold
Agent all becomes gas phase and returns to refrigerant compressor entrance cryogen suction tank.
Two sections of compressed liquid phase cryogens will using centrifugal multistage pump multiple centrifugal pump in traditional single-stage throttling azeotrope refrigeration process
Cryogen is sent at the top of heat exchanger.Multistage centrifugal cryogenic fluid pump has the following problems in the actual use process:
1. the use of cryogenic fluid pump increases the quantity of rotating machinery in device, investment is increased；
2. the saturated vapor pressure due to azeotrope is lower, according to horizontal multi-stage centrifugal pump, cryogen knockout drum is needed to lift
It is high more, largely increase civil engineering costs；According to vertical multi-stage centrifugal pump, then centrifugal pump bearing is thinner, and bearing length
Degree is longer, is easy to generate vibration and damage the mechanical seal pumped in the process of running, production and stable operation band to device
Greatly perplex.
Summary of the invention
One of the technical problem to be solved in the present invention is to provide a kind of single-stage throttling single cycle azeotrope refrigeration system, it
It is at low cost, it is stable.
The single cycle azeotrope refrigeration system in order to solve the above technical problems, single-stage of the invention throttles includes:
Azeotrope suction tank is arranged before refrigerant compressor level-one entrance, buffers for azeotrope；
Refrigerant compressor, for compressing azeotrope；
Intercondenser, for cooling down the azeotrope of refrigerant compressor primary outlet；
Stage separation tank, the gas-liquid two-phase in azeotrope for separating intercondenser outlet；
Cryogenic fluid pump between grade, for promoting the pressure for the liquid phase cryogen that stage separation tank is isolated；
Condenser, for cooling down the azeotrope of refrigerant compressor secondary exit port；
Cryogen knockout drum, for the gas-liquid two-phase in the azeotrope of separation condenser outlet；
Heat exchanger exchanges heat for gas phase cryogen and liquid phase cryogen mixing and with gaseous feed；
Pressure regulatory element is arranged in cryogen knockout drum and exports on the pipeline between heat exchanger top entry, is used for
Adjust the pressure of gas phase cryogen.
The pressure regulatory element can choose room temperature J-T valve.The pressure drop of pressure regulatory element should be greater than being equal to cryogen
The liquid phase cryogen of knockout drum outlet enters the height to be overcome at the top of heat exchanger by the resistance drop and liquid phase cryogen of heat exchanger
Spend the summation of difference.
The gaseous feed is natural gas.
Preferably, being additionally provided with low pressure heavy hydrocarbon heat exchanger and the heat exchange of high pressure heavy hydrocarbon between cryogen knockout drum and heat exchanger
Device, the high pressure heavy hydrocarbon heat exchanger are also connect with heavy hydrocarbon knockout drum outlet at bottom simultaneously, for condensation in the middle part of recovery heat exchanger
The cooling capacity for the heavy constituent isolated.
The heat exchanger can select plate-fin aluminium heat exchanger or around tubing heat exchanger.
The second technical problem to be solved by the present invention is to provide the throttling single cycle azeotrope of the single-stage based on above system
Refrigerating method.
The single cycle azeotrope refrigerating method in order to solve the above technical problems, single-stage of the invention throttles, comprising steps of
1) azeotrope is sucked out from azeotrope suction tank, is condensed through one section of refrigerant compressor compression, intercondenser, into
Enter stage separation tank and carries out first time gas-liquid separation；
2) liquid phase after separating for the first time is pressurized through cryogenic fluid pump between grade, and gas phase is compressed through two sections of refrigerant compressor；
3) pressurized liquid phase mixes again with compressed gas phase, after condenser condenses, into cryogen knockout drum into
Second of gas-liquid separation of row；
4) liquid phase after separating to second cools down, and gas phase is depressured；
5) liquid phase after gas phase and cooling after being depressured is mixed, is formed respectively by entering heat exchanger at the top of heat exchanger
Refrigerant again returns to heat exchanger, after heat exchange, is sent into azeotrope suction tank, completes a refrigeration cycle.
The step 4), the liquid phase after second of separation successively exchange heat through low pressure heavy hydrocarbon heat exchanger, high pressure heavy hydrocarbon heat exchanger
Cooling.The pressure drop of gas phase is more than or equal to liquid phase by the resistance drop and liquid of low pressure heavy hydrocarbon heat exchanger, high pressure heavy hydrocarbon heat exchanger
Mutually enter the summation for the difference in height for needing to overcome at the top of heat exchanger.
The present invention cancel device in azeotrope pump, be changed to cryogen knockout drum gaseous phase outlet to heat exchanger entrance it
Between pipeline on increase a pressure regulatory element, adjust cryogen knockout drum top exit gas phase cryogen pressure after enter heat hand over
Parallel operation, and the liquid phase cryogen of cryogen knockout drum outlet at bottom then relies on the vapour pressure in cryogen knockout drum to pass through as motive force
After low pressure heavy hydrocarbon heat exchanger, high pressure heavy hydrocarbon heat exchanger, is finally mixed in a heat exchanger with gas phase cryogen, become liquefied natural gas
The azeotrope of refrigeration process, this process flow reduces the quantity of rotating machinery in device, in a manner of pressure regulatory element
By failure rate in actual motion it is high rotating machinery replacement, thus improve device operability and device operation it is steady
It is qualitative.
Detailed description of the invention
Fig. 1 is traditional single-stage throttling azeotrope refrigeration system and process flow diagram.
Fig. 2 is the single-stage throttling single cycle azeotrope refrigeration system and process flow diagram of the embodiment of the present invention.
The reference numerals are as follows in figure:
31: azeotrope suction tank
32,34,36,38,40,43,45,47,51,52,54,55: pipeline
33: refrigerant compressor
35: intercondenser
37: stage separation tank
39: cryogenic fluid pump between grade
41: liquid phase cryogen
42: condenser
44: cryogen knockout drum
46: gas phase cryogen pressure regulatory element
48: heat exchanger
49: low pressure heavy hydrocarbon heat exchanger
50: high pressure heavy hydrocarbon heat exchanger
53:J-T valve
60: azeotrope pump
Specific embodiment
To have more specific understanding to technology contents of the invention, feature and effect, now in conjunction with attached drawing, details are as follows:
Embodiment 1
As shown in Fig. 2, the single-stage throttling single cycle azeotrope refrigeration system of the present embodiment includes azeotrope suction tank
31, cryogenic fluid pump 39 between refrigerant compressor 33, intercondenser 35, stage separation tank 37, grade, condenser 42, cryogen knockout drum 44,
Gas phase cryogen pressure regulatory element 46, heat exchanger 48, low pressure heavy hydrocarbon heat exchanger 49, high pressure heavy hydrocarbon heat exchanger 50.
Comparison diagram 1 and Fig. 2, it can be seen that the single-stage throttling single cycle azeotrope refrigeration system of the present embodiment compares Fig. 1
Traditional single stage throttle azeotrope refrigeration system, eliminate the use of the last azeotropes pump 60 of two sections of compressor, but mixed
It closes and increases a gas phase cryogen pressure on the pipeline between 44 gaseous phase outlet of cryogen knockout drum and 48 top entry of heat exchanger
Regulating element 46 (room temperature J-T valve can be used in the gas phase cryogen pressure regulatory element 46).
When single-stage throttling single cycle azeotrope refrigeration system operation, azeotrope is inhaled from azeotrope suction tank 31
Out, one section of compression through the entrance refrigerant compressor 33 of pipeline 32, one section of compressed azeotrope is through cold between the entrance grade of pipeline 34
Condenser 35 condense, condensed two-phase mixtures cryogen, which enters in stage separation tank 37, to be separated, the gas phase azeotrope isolated into
Enter two sections of compressor 33 compressions, the azeotropes of two sections of compression outlets through pipeline 40 and stage separation go out through cryogenic fluid pump between grade
The liquid phase cryogen 41 of 39 pressurizations enters in condenser 42 after mixing to be condensed, and condensed high-pressure two-phase cryogen enters cold through pipeline 43
Two-phase laminated flow is carried out in agent knockout drum 44, the gas phase cryogen after separation enters gas phase cryogen pressure regulatory element 46 through pipeline 45 and adjusts
Saving its pressure, (pressure drop of gas phase cryogen pressure regulatory element 46 need to be more than or equal to liquid phase cryogen by low pressure heavy hydrocarbon heat exchanger
49, the resistance drop and liquid phase cryogen of high pressure heavy hydrocarbon heat exchanger 50 enter the total of the difference in height for needing to overcome at the top of heat exchanger 48
With), the gas phase cryogen after decompression enters heat exchanger 48 after pipeline 47, and liquid phase cryogen is by the steam in cryogen knockout drum 44
Pressure is used as motive force, successively after low pressure heavy hydrocarbon heat exchanger 49, high pressure heavy hydrocarbon heat exchanger 50 exchange heat, enters heat through pipeline 51 and hands over
Parallel operation 48.The liquid phase cryogen in gas phase cryogen and pipeline 51 in pipeline 47 enters the same channels of heat exchanger 48, hands in heat
Mixing (mixed cryogen is used as refrigerant, and cooling prepares liquefied natural gas), goes out from the bottom of heat exchanger 48 in parallel operation 48
Come, the J-T valve 53 of single closure hybrid refrigeration cycle is entered through pipeline 52, the low-temp low-pressure azeotrope warp come out from J-T valve 53
Pipeline 54 is back to another channel of heat exchanger 48, comes out after heat exchange from the top of heat exchanger 48, returns through pipeline 55
It is back in azeotrope suction tank 31.Since then, single closure hybrid refrigeration completes a refrigeration cycle.
Claims (9)
- The single cycle azeotrope refrigeration system 1. single-stage throttles includes:The buffering before refrigerant compressor level-one entrance, for azeotrope is arranged in azeotrope suction tank；Refrigerant compressor, for compressing azeotrope；Intercondenser, for cooling down the azeotrope of refrigerant compressor primary outlet；Stage separation tank, the gas-liquid two-phase in azeotrope for separating intercondenser outlet；Cryogenic fluid pump between grade, for promoting the pressure for the liquid phase cryogen that stage separation tank is isolated；Condenser, for cooling down the azeotrope of refrigerant compressor secondary exit port；Cryogen knockout drum, for the gas-liquid two-phase in the azeotrope of separation condenser outlet；Heat exchanger is mixed for gas phase cryogen and liquid phase cryogen, and is exchanged heat with gaseous feed；It is characterized in that,It is additionally provided with pressure on the pipeline that the cryogen knockout drum exports between the heat exchanger top entry and adjusts member Part, for adjusting the pressure of gas phase cryogen.
- 2. system according to claim 1, which is characterized in that the pressure drop of the pressure regulatory element is more than or equal to cryogen The liquid phase cryogen of knockout drum outlet enters the height to be overcome at the top of heat exchanger by the resistance drop and liquid phase cryogen of heat exchanger Spend the summation of difference.
- 3. system according to claim 1, which is characterized in that the pressure regulatory element is room temperature J-T valve.
- 4. system according to claim 1, which is characterized in that the gaseous feed is natural gas.
- 5. system according to claim 1, which is characterized in that be additionally provided with low pressure between cryogen knockout drum and heat exchanger Heavy hydrocarbon heat exchanger and high pressure heavy hydrocarbon heat exchanger, the high pressure heavy hydrocarbon heat exchanger are also connect with heavy hydrocarbon knockout drum outlet at bottom simultaneously.
- 6. system according to claim 1, which is characterized in that the heat exchanger be plate-fin aluminium heat exchanger or around Tubing heat exchanger.
- The single cycle azeotrope refrigerating method 7. the single-stage based on any one of the claim 1-6 system throttles, feature exist In step includes:1) azeotrope is sucked out from azeotrope suction tank, is condensed through one section of refrigerant compressor compression, intercondenser, into grade Between knockout drum carry out first time gas-liquid separation；2) liquid phase after separating for the first time is pressurized through cryogenic fluid pump between grade, and gas phase is compressed through two sections of refrigerant compressor；3) pressurized liquid phase mixes again with compressed gas phase, after condenser condenses, carries out the into cryogen knockout drum Secondary gas-liquid separation；4) liquid phase after separating to second cools down, and gas phase is depressured；5) for the liquid phase after gas phase and cooling after being depressured respectively by entering heat exchanger at the top of heat exchanger, mixing forms refrigeration Agent again returns to heat exchanger, after heat exchange, is sent into azeotrope suction tank, completes a refrigeration cycle.
- 8. the liquid phase after second of separation is successively through low pressure the method according to the description of claim 7 is characterized in that step 4) Heavy hydrocarbon heat exchanger, the heat exchange cooling of high pressure heavy hydrocarbon heat exchanger.
- 9. according to the method described in claim 8, it is characterized in that, step 4), the pressure drop of gas phase are passed through more than or equal to liquid phase Low pressure heavy hydrocarbon heat exchanger, the resistance drop of high pressure heavy hydrocarbon heat exchanger and liquid phase enter the difference in height for needing to overcome at the top of heat exchanger Summation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711044547.1A CN109724279A (en) | 2017-10-31 | 2017-10-31 | Single-stage throttling single cycle azeotrope refrigeration system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711044547.1A CN109724279A (en) | 2017-10-31 | 2017-10-31 | Single-stage throttling single cycle azeotrope refrigeration system and method |
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| Publication Number | Publication Date |
|---|---|
| CN109724279A true CN109724279A (en) | 2019-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711044547.1A Pending CN109724279A (en) | 2017-10-31 | 2017-10-31 | Single-stage throttling single cycle azeotrope refrigeration system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109724279A (en) |
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2017
- 2017-10-31 CN CN201711044547.1A patent/CN109724279A/en active Pending
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