CN208153077U - A kind of LNG cold energy use system - Google Patents
A kind of LNG cold energy use system Download PDFInfo
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- CN208153077U CN208153077U CN201820402196.0U CN201820402196U CN208153077U CN 208153077 U CN208153077 U CN 208153077U CN 201820402196 U CN201820402196 U CN 201820402196U CN 208153077 U CN208153077 U CN 208153077U
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- 239000007791 liquid phase Substances 0.000 claims abstract description 153
- 239000012071 phase Substances 0.000 claims abstract description 148
- 239000007789 gas Substances 0.000 claims abstract description 117
- 238000010438 heat treatment Methods 0.000 claims abstract description 81
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 239000003345 natural gas Substances 0.000 claims abstract description 17
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 18
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 16
- 239000002918 waste heat Substances 0.000 claims description 13
- 239000001294 propane Substances 0.000 claims description 9
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims description 8
- 239000013535 sea water Substances 0.000 claims description 7
- IJDNQMDRQITEOD-UHFFFAOYSA-N sec-butylidene Natural products CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 15
- 238000002309 gasification Methods 0.000 abstract description 5
- 239000003949 liquefied natural gas Substances 0.000 description 118
- 238000001704 evaporation Methods 0.000 description 15
- 230000008020 evaporation Effects 0.000 description 11
- 239000003507 refrigerant Substances 0.000 description 10
- 238000009834 vaporization Methods 0.000 description 5
- 230000008016 vaporization Effects 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 150000001335 aliphatic alkanes Chemical class 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001595 flow curve Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002068 genetic effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- -1 isobutyl Alkane Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The utility model provides a kind of LNG cold energy use system, including liquid phase heating zone subsystem, gas-liquid two-phase heating zone subsystem and gas phase heating zone subsystem；The input terminal of liquid phase heating zone subsystem is connect with the output end of LNG low-lift pump, and the input terminal of LNG low-lift pump is connect with LNG intake pipeline；The output end of liquid phase heating zone subsystem is connect with the input terminal of Gas-liquid phase region heating subsystem, the output end of gas-liquid two-phase heating zone subsystem is connect with the input terminal of gas phase heating zone subsystem, and the output end of gas phase heating zone subsystem is connect with natural gas export pipeline.The utility model carries out cascade utilization to LNG cold energy and improves the cold of LNG cold energy so that cold energy use process matches with LNG gasification curve by setting liquid phase, gas-liquid two-phase and gas phase heating zone subsystemEfficiency.
Description
Technical field
The utility model relates to energy utilization fields, and in particular to a kind of LNG cold energy use system.
Background technique
LNG (liquefied natural gas) is -162 DEG C under normal pressure of cryogenic liquid mixtures, and LNG receiving station is to receive sea-freight
LNG and build LNG vaporization factory by the sea.LNG receiving station be used for by by ocean carrier conveying come LNG unload
Then the LNG of liquid is vaporized by ship and storage, the natural gas that vaporization obtains is exported by pipeline with for users to use.
It can produce the cold energy of about 240kWh when LNG vaporization per ton is at natural gas, rationally can generate considerable warp using this part cold energy
It helps benefit, for example, cold energy is used to generate electricity, the fields such as low-temperature cold store and ice storage.
Since temperature is increased to 10 DEG C from -162 DEG C to LNG during cold energy discharges, temperature span range is larger；And it is existing
In technology, the LNG cold energy use system of single-stage is generallyd use, the cold energy discharged to LNG heating utilizes, but single level system
It causes coldLose larger, cold energy use efficiency is lower.
Utility model content
In view of the above defects of the prior art, the utility model provides a kind of LNG cold energy use system.
The utility model provides a kind of LNG cold energy use system, including liquid phase heating zone subsystem, gas-liquid two-phase heating zone
Subsystem and gas phase heating zone subsystem；The input terminal of liquid phase heating zone subsystem is connect with the output end of LNG low-lift pump, LNG
The input terminal of low-lift pump is connect with LNG intake pipeline；Output end and Gas-liquid phase region the heating subsystem of liquid phase heating zone subsystem
The input terminal of system connects, and the output end of gas-liquid two-phase heating zone subsystem is connect with the input terminal of gas phase heating zone subsystem, gas
The output end of phase heating zone subsystem is connect with natural gas export pipeline.
Wherein, the liquid phase heating zone subsystem specifically includes liquid phase region heat exchanger, liquid phase region circulatory mediator pump, liquid phase region
Circulatory mediator heat exchanger and liquid phase region expanding machine；The LNG input terminal of liquid phase region heat exchanger is connect with the output end of LNG low-lift pump,
The LNG output end of liquid phase region heat exchanger is connect with the input terminal of gas-liquid two-phase heating zone subsystem；The medium of liquid phase region heat exchanger
Input terminal is connect with the output end of liquid phase region expanding machine, the medium output end of liquid phase region heat exchanger successively with liquid phase region circulatory mediator
Pump, liquid phase region circulatory mediator heat exchanger are connected with the input terminal of liquid phase region expanding machine.
Wherein, mole group of the circulatory mediator of the liquid phase heating zone subsystem becomes methane 45-56%, ethane 30-
50%, propane 10-20%, normal butane 5-7%, pentane 5-7%.
Wherein, the gas-liquid two-phase heating zone subsystem specifically includes Gas-liquid phase region heat exchanger；Gas-liquid phase region heat exchange
The LNG input terminal of device is connect with the LNG output end of liquid phase region heat exchanger, the LNG output end and gas phase of Gas-liquid phase region heat exchanger
The input terminal of heating zone subsystem connects.
Wherein, the dew-point temperature of the circulatory mediator of the gas-liquid two-phase heating zone subsystem and LNG be at the same pressure
Bubble point temperature differs 1 to 2 DEG C.
Wherein, the gas phase heating zone subsystem specifically includes gas phase zone heat exchanger, gas phase zone circulatory mediator pump, gas phase zone
Circulatory mediator heat exchanger and gas phase zone expanding machine；The LNG input terminal and the LNG of Gas-liquid phase region heat exchanger of gas phase zone heat exchanger are defeated
Outlet connection, the natural gas output end of gas phase zone heat exchanger are connect with the input terminal of natural gas export pipeline；Gas phase zone heat exchanger
Medium input terminal connect with the output end of gas phase zone expanding machine, the medium output end of gas phase zone heat exchanger is successively followed with gas phase zone
Ring medium pump, gas phase zone circulatory mediator heat exchanger are connected with the input terminal of gas phase zone expanding machine.
Wherein, mole group of the circulatory mediator of the gas phase heating zone subsystem becomes ethane 30-55%, propane 25-
40%, pentane 30-40%.
Wherein, the waste heat input terminal of gas phase zone circulatory mediator heat exchanger is connect with seawater or industrial exhaust heat inlet line, gas
The waste heat output end of phase region circulatory mediator heat exchanger is connect with the waste heat input terminal of liquid phase region circulatory mediator heat exchanger, and liquid phase region is followed
The waste heat output end of ring media heat exchanger is connect with seawater or industrial exhaust heat outlet line.
LNG cold energy use system provided by the utility model passes through setting liquid phase, gas-liquid two-phase and gas phase heating zone subsystem
System carries out cascade utilization to LNG cold energy and improves LNG cold energy so that cold energy use process matches with LNG gasification curve
It is coldEfficiency.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is
Some embodiments of the utility model, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of LNG cold energy use system provided by the embodiment of the utility model；
Fig. 2 is the evaporation curve schematic diagram of LNG cold energy use system provided by the embodiment of the utility model；
In figure, 1-LNG intake pipeline, 2-LNG low-lift pump, 3- low pressure LNG feed-line, the liquid phase region 4- heat exchanger, 5- liquid
Phase region LNG outlet line, the liquid phase region 6- expander outlet pipeline, the liquid phase region 7- expanding machine, the liquid phase region 8- expanding machine admission line,
The liquid phase region 9- circulatory mediator heat exchanger, 10, liquid phase region circulatory mediator pump discharge pipeline, the liquid phase region 11- circulatory mediator pump, 12- liquid
Phase region circulatory mediator pump liquid phase inlet line, 13- Gas-liquid phase region heat exchanger, 14- Gas-liquid phase region heat exchanger exit pipeline,
The special refrigerant circulation medium entrance pipeline of 15-, the special refrigerant circulation media outlet pipeline of 16-, the gas phase zone 17- heat exchanger, 18- days
Right gas export pipeline, the gas phase zone 19- expander outlet pipeline, the gas phase zone 20- expanding machine, the gas phase zone 21- circulatory mediator expanding machine
Inlet line, the gas phase zone 22- circulatory mediator heat exchanger, the gas phase zone 23- circulatory mediator pump discharge pipeline, the gas phase zone 24- circulation are situated between
Matter pump, the gas phase zone 25- circulatory mediator pump inlet pipeline, 26, industrial exhaust heat or sea intake pipeline, the gas phase zone 27- industrial exhaust heat
Or seawer outlet pipeline, the liquid phase region 28- industrial exhaust heat or sea intake pipeline, the liquid phase region 29- industrial exhaust heat or seawer outlet pipe
Line.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, is explicitly described the technical scheme in the embodiment of the utility model, it is clear that described reality
Applying example is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, ability
It is practical new to belong to this for domain those of ordinary skill every other embodiment obtained without making creative work
The range of type protection.
In the description of the utility model embodiment, it should be noted that term " center ", "upper", "lower", " left side ",
The orientation or positional relationship of the instructions such as " right side ", "vertical", "horizontal", "inner", "outside" is orientation based on the figure or position
Relationship, be merely for convenience of description the utility model embodiment and simplify description, rather than the device of indication or suggestion meaning or
Element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as implementing the utility model
The limitation of example.In addition, term " first ", " second ", " third " are used for description purposes only, it is not understood to indicate or imply phase
To importance.
In the description of the utility model embodiment, it should be noted that unless otherwise clearly defined and limited, term
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary
It is connected, can be the connection inside two elements.For the ordinary skill in the art, on being understood with concrete condition
State concrete meaning of the term in the utility model embodiment.
In embodiment provided by the utility model, unless otherwise instructed, " LNG " i.e. liquefied natural gas, and it is above opposite
The term answered can be substituted for each other.
Fig. 1 is the structural schematic diagram of LNG cold energy use system provided by the embodiment of the utility model, as shown in Figure 1, including
Liquid phase heating zone subsystem, gas-liquid two-phase heating zone subsystem and gas phase heating zone subsystem；Liquid phase heating zone subsystem it is defeated
Enter end to connect with the output end of LNG low-lift pump, the input terminal of LNG low-lift pump is connect with LNG intake pipeline 1；Liquid phase heating zone
The input terminal of the output end of system and Gas-liquid phase region heating subsystem connect, the output end of gas-liquid two-phase heating zone subsystem and
The input terminal of gas phase heating zone subsystem connects, and the output end of gas phase heating zone subsystem is connect with natural gas export pipeline 18.
Specifically, since LNG is under different outer defeated pressure, evaporation curve is not quite similar；Such as when pressure defeated outside natural gas
When power is 8MPa, vaporescence is a curve being smoothly gradually increasing, and LNG includes meteorological and two stages of liquid phase；And work as
When defeated pressure is 3MPa outside natural gas, the vaporization of LNG can undergo liquid phase region, the latent heat area of gas-liquid two-phase and gas phase zone；Wherein, exist
In the latent heat area of gas-liquid two-phase, LNG evaporation process approximately constant temperature process, as shown in Fig. 2, i.e. in this process, LNG constantly inhales
It receives heat but temperature remains unchanged substantially, but crossed after two-phase section, LNG shows as the continuous absorption with heat, and temperature is continuous
It increases.
Therefore, the utility model embodiment is provided a kind of and low pressure LNG and is steamed based on the indicatrix in LNG evaporation process
The cold energy use system that hair curve matches fully considers the evaporation curve phase of T-S the figure variation and LNG of working medium in cyclic process
Matching, so that liquid phase heating zone subsystem, gas-liquid two-phase heating zone subsystem and gas phase heating zone subsystem be arranged.
In liquid phase heating subsystem, LNG exchanges heat in liquid form；Enter gas-liquid two-phase heating zone after heat exchange
System releases latent heat；It finally enters in gas phase heating subsystem and discharges cold energy, become gaseous natural gas, and by natural
The output of gas export pipeline, completes cold energy use.
LNG cold energy use system provided by the embodiment of the utility model is heated up by setting liquid phase, gas-liquid two-phase and gas phase
Area's subsystem carries out cascade utilization to LNG cold energy and improves LNG so that cold energy use process matches with LNG gasification curve
Cold energy it is coldEfficiency.
Based on any of the above embodiments, the liquid phase heating zone subsystem specifically includes liquid phase region heat exchanger 4, liquid
Phase region circulatory mediator pump 11, liquid phase region circulatory mediator heat exchanger 9 and liquid phase region expanding machine 7；The LNG of liquid phase region heat exchanger 4 is inputted
End is connect with the output end of LNG low-lift pump 2, and the LNG output end of liquid phase region heat exchanger 4 is defeated with gas-liquid two-phase heating zone subsystem
Enter end connection；The medium input terminal of liquid phase region heat exchanger 4 is connect with the output end of liquid phase region expanding machine 7, the liquid phase region heat exchange
The medium output end of device 4 successively pumps 11, liquid phase region circulatory mediator heat exchanger 9 and liquid phase region expanding machine 7 with liquid phase region circulatory mediator
Input terminal connection.
Specifically, liquid phase heating zone heat exchange subsystem uses Rankine cycle；LNG from LNG storage tank enters the latent liquid of low pressure
Pump (i.e. LNG low-lift pump 2) is forced into outer defeated rear liquor charging phase region heat exchanger 4.
After the pressurization of LNG low-lift pump 2, LNG enters liquid phase region heat exchanger 4 and Rankine cycle media for heat exchange, and controls liquid phase
The temperature of the outlet LNG of area's heat exchanger 4 is lower than 1-2 DEG C of the gasification temperature of LNG at this pressure, and gaseous circulatory mediator is by LNG
It is cooled to liquid.
After the organic circulation medium cooled down by LNG is sent into 11 pressurization of liquid phase region circulatory mediator pump, it is sent into liquid phase region circulation and is situated between
Matter heat exchanger 9.
After being sent into liquid phase region circulatory mediator heat exchanger 9 by the organic circulation medium after 11 pressurization of circulatory mediator pump, it is sent into liquid
Phase region expanding machine 7；After circulatory mediator is sent into the acting power generation of expanding machine 7, feeding liquid phase region heat exchanger 4 carries out next Rankine and follows
Ring.
Based on any of the above embodiments, mole group of the circulatory mediator of the liquid phase heating zone subsystem becomes first
Alkane 45-56%, ethane 30-50%, propane 10-20%, normal butane 5-7%, pentane 5-7%.
The proportion for the liquid phase region circulatory mediator that the utility model embodiment uses calls HYSYS using MATLAB, and passes through
HYSYS calculate more than ten cryogens for feeding back to MATLAB and being calculated, to use and formula carried out using genetic algorithm it is excellent
Change, has selected suitable cryogen and proportion by the assignment to HYSYS and by HYSYS operation feedback, this organic circulation medium
Evaporation curve of the cooling curve just with LNG in liquid phase region match, the corresponding trend increased is presented.
The mixing circulation medium that the utility model embodiment uses, overcoming cannot expire using when simple subprogram medium simultaneously
Caused by foot is big for different evaporating pressures and evaporating temperature section the problem of low efficiency.
Based on any of the above embodiments, the gas-liquid two-phase heating zone subsystem specifically includes Gas-liquid phase region and changes
Hot device；The LNG input terminal of Gas-liquid phase region heat exchanger is connect with the LNG output end of liquid phase region heat exchanger, Gas-liquid phase region heat exchange
The LNG output end of device is connect with the input terminal of gas phase heating zone subsystem.
Specifically, the LNG sent out after being exchanged heat by liquid phase region heat exchanger 4 is sent into Gas-liquid phase region heat exchanger 13, by a certain spy
Different refrigerant circulation medium takes away the cold energy of this part LNG；Furthermore, it is desirable to control the outlet LNG of Gas-liquid phase region heat exchanger 13
Temperature be higher than 1-2 DEG C of the gasification temperature of LNG at this pressure, and control special refrigerant circulation be isothermal phase change.
Based on any of the above embodiments, the dew-point temperature of the circulatory mediator of the gas-liquid two-phase heating zone subsystem
1 to 2 DEG C is differed with the bubble point temperature of LNG at the same pressure.
Wherein, dew point (or frost point) temperature refers to air under the conditions of moisture content and all immovable air pressure, is cooled to full
With when temperature.
Wherein, bubble point be start to isolate the pressure of first bubble from liquid phase in the case where temperature is certain, or
In the case that pressure is certain, start the temperature that first bubble is isolated from liquid phase；Liquid mixture is under certain pressure and opens
Begin the temperature boiled, bubble point referred to as at this pressure.
Specifically, refrigerant circulation medium special in gas-liquid two-phase heating zone subsystem is carried out according to LNG evaporating pressure
Selection, the principle selected differs for the dew-point temperature of special refrigerant circulation medium with the bubble point temperature of LNG at a particular pressure
It is best at 1-2 DEG C；Such as when the pressure for vaporization of LNG is 4MPa, special coolant media selects CO2；So that latent in gas-liquid two-phase
Hot-zone, the evaporation curve and CO of LNG2Curve matches, and the corresponding trend of less parallel is presented.
Based on any of the above embodiments, the gas phase heating zone subsystem specifically include gas phase zone heat exchanger 17,
Gas phase zone circulatory mediator pump 24, gas phase zone circulatory mediator heat exchanger 22 and gas phase zone expanding machine 20；The LNG of gas phase zone heat exchanger 17
Input terminal is connect with the LNG output end of Gas-liquid phase region heat exchanger 13, the natural gas output end of gas phase zone heat exchanger 17 and natural
The input terminal of gas export pipeline 18 connects；The medium input terminal of gas phase zone heat exchanger 17 and the output end of gas phase zone expanding machine 19 connect
It connects, the medium output end of gas phase zone heat exchanger 17 successively pumps 24, gas phase zone circulatory mediator heat exchanger 22 with gas phase zone circulatory mediator
It is connected with the input terminal of gas phase zone expanding machine 20.
Specifically, the LNG sent out after being exchanged heat by Gas-liquid phase region heat exchanger 13 is sent into gas phase zone heat exchanger 17 and exchanges heat, gaseous state
Circulatory mediator liquid is cooled to by LNG, LNG is vaporizated into defeated outside natural gas.
After the organic circulation medium cooled down by LNG is sent into 24 pressurization of gas phase zone circulatory mediator pump, it is sent into gas phase zone circulation and is situated between
Matter heat exchanger 22.
After being sent into gas phase zone circulatory mediator heat exchanger 22 by the organic circulation medium after 24 pressurization of gas phase zone circulatory mediator pump,
It is heated be vaporizated into gaseous recycle medium after, be sent into gas phase zone expanding machine 20；Circulatory mediator is sent into gas phase zone expanding machine 20 and does work
After power generation, it is sent into gas phase zone heat exchanger 17 and carries out next circulation.
Based on any of the above embodiments, mole group of the circulatory mediator of the gas phase heating zone subsystem becomes second
Alkane 30-55%, propane 25-40%, pentane 30-40%.
Specifically, the method for obtaining method Yu liquid phase region blending agent of the circulatory mediator proportion of gas phase heating zone subsystem
Identical, the cooling curve of this obtained organic circulation medium matches with LNG in gas phase zone evaporation curve, and approximately linear pair is presented
The trend that should increase.
Based on any of the above embodiments, the waste heat input terminal and seawater of the gas phase zone circulatory mediator heat exchanger 22
Or industrial exhaust heat inlet line 26 connects, the waste heat output end of the gas phase zone circulatory mediator heat exchanger 22 and liquid phase region circulation are situated between
The waste heat input terminal of matter heat exchanger 9 connects, more than the waste heat output end and seawater of the liquid phase region circulatory mediator heat exchanger 9 or industry
Hot outlet line 29 connects.
Specifically, it is situated between using seawater or industrial exhaust heat to the circulation of liquid phase heating zone subsystem and gas phase heating zone subsystem
Matter is heated.
LNG cold energy use system provided by the above embodiment illustrated below：It is high-pressure natural gas in LNG receiving station
User supplies the natural gas of 4MPa, and mole composition of LNG is as follows：Methane 88.77%, ethane 7.54%, propane 2.59%, isobutyl
Alkane 0.45%, normal butane 0.56%, nitrogen 0.08%；Equipped with 2 16*104m3LNG storage tank, boiling point is -162 under LNG normal pressure
DEG C, density 456kg/m3For, each storage tank warehousing total amount (assuming that storage tank is canful) 72960t.The operating pressure of storage tank is
The outer throughput rate of 0.150MPa, LNG are 200t/h.
With LNG evaporating pressure be 4MPa, Gas-liquid phase region circulatory mediator is CO2, Rankine cycle medium in liquid phase region is methane
45%, ethane 40%, propane 7%, normal butane 5%, pentane 3%, Rankine cycle medium in gas phase zone is ethane 40%, propane
30%, pentane 30%, the evaporation curve of LNG and the evaporation curve that each stage chooses medium are as shown in Figure 2.
In liquid phase heating zone subsystem, LNG directly connects LNG low-lift pump 2 by LNG intake pipeline 1 after being exported by storage tank
Output end；LNG pressurization after, output end connect low pressure LNG feed-line 3 input terminal, low pressure LNG feed-line 3 it is defeated
Outlet connects the liquid phase input terminal (i.e. LNG input terminal) of liquid phase region heat exchanger 4, the liquid phase region LNG outlet of liquid phase region heat exchanger 4
Line 5 connects the input terminal of Gas-liquid phase region heat exchanger 13, the liquid phase region circulatory mediator pump liquid phase inlet tube of liquid phase region heat exchanger 11
Line 12 connects the input terminal of liquid phase region circulatory mediator pump 11；The liquid phase region circulatory mediator pump discharge pipe of liquid phase region circulatory mediator pump 11
The input terminal of the connection liquid phase region circulatory mediator heat exchanger 9 of line 10；The output end of liquid phase region circulatory mediator heat exchanger 9 connects liquid phase region
Expanding machine admission line 8；The outlet end of liquid phase region expanding machine 7 connects liquid phase region expander outlet pipeline 6, and liquid phase region expanding machine goes out
Mouth pipeline 6 is connected with the gas phase input end of liquid phase region heat exchanger 4.
In the operational process of liquid phase heating zone subsystem, LNG is pressurized to 4MPa through LNG low-lift pump 2, is warming up to 159.8
Temperature rises to -93 DEG C after entering liquid phase region heat exchanger 4, with Rankine cycle media for heat exchange after DEG C；Rankine cycle medium is cooled down by LNG
After feeding liquid phase region circulatory mediator pump 11 is forced into 5MPa after to -142.1 DEG C, liquid phase region circulatory mediator heat exchanger 9 is sent by work
Industry waste-heat；After temperature is upgraded to 23 DEG C, it is sent into temperature after liquid phase region expanding machine 7 is expanded to 200kPa and is reduced to -70.29 DEG C, send
Enter liquid phase region heat exchanger 4 and carries out next circulation.
In Gas-liquid phase region heating subsystem, Gas-liquid phase region heat exchanger exit pipeline 14 and Gas-liquid phase region heat exchanger
13 outlet end is connected, another import phase of special refrigerant circulation medium entrance pipeline 15 and Gas-liquid phase region heat exchanger 13
Connection, special refrigerant circulation media outlet pipeline 16 are connected with another outlet of Gas-liquid phase region heat exchanger 13.
Gas-liquid phase region heating subsystem operational process in, LNG be sent into Gas-liquid phase region heat exchanger 13 after temperature by-
93 DEG C are upgraded to -83 DEG C, and special refrigerant circulation medium is cooled to -86 DEG C of liquid phase by -75 DEG C of gas phase by LNG；Also, it can will be cold
The cold energy of matchmaker's circulatory mediator is for freezer perhaps for Rankine cycle power generation or for the preparation of dry ice.
In gas phase heating zone subsystem, the input end and Gas-liquid phase region heat exchanger exit of gas phase zone heat exchanger 17
Pipeline 14 is connected, and natural gas export pipeline 18 is connected with the outlet end of gas phase zone heat exchanger 17；Gas phase zone heat exchanger 17
Gas phase zone circulatory mediator pump inlet pipeline 25 connects the input terminal of gas phase zone circulatory mediator pump 24, gas phase zone circulatory mediator pump 24
Export pipeline 23 connects the input terminal of gas phase zone circulatory mediator heat exchanger 22, and the output end of gas phase zone circulatory mediator heat exchanger 22 connects
Gas phase zone expanding machine admission line 21 is connect, the outlet end of gas phase zone expanding machine 20 connects gas phase zone expander outlet pipeline 19, gas
Phase region expander outlet pipeline 19 is connected with the gas phase input end of gas phase zone heat exchanger 17.
In the operational process of phase heating zone subsystem, 4MPa, -83 DEG C of LNG are sent into gas phase zone heat exchanger 17 and heated up
It is directly outer defeated after to 15 DEG C；After gas phase zone Rankine cycle medium is cooled to -66.3 DEG C by LNG, it is sent into gas phase zone circulatory mediator pump
24, after being forced into 4MPa by 150kPa, it is sent into gas phase zone circulatory mediator heat exchanger 22；It is sent into after heating 130 DEG C by industrial exhaust heat
Gas phase zone expanding machine 20 is expanded to 150kPa, and gas phase zone heat exchanger 17 is sent into after acting and continues next circulation.
In addition, LNG cold energy generation is sold for whole station or the online that is connected to the grid；The heat exchanger can use two-phase
Media heat exchanger, the low-lift pump and circulatory mediator pump etc. can use cryogenic pump, and the expanding machine can use low temperature
Turbo-expander.
Shown in sum up, the curve of LNG evaporation curve and circulatory mediator in whole process is as shown in Fig. 2, using multistage Rankine
Circulating generation and refrigerant absorb the cold energy of LNG, to keep temperature-hot-fluid of the circulatory mediator during entire cold energy use bent
Temperature-heat flow curve that line and LNG evaporate under low pressure shows the trend of matched, improves the fiery effect of LNG cold energy
Rate.
Finally it should be noted that：Above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that：
It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is carried out etc.
With replacement；And these are modified or replaceed, various embodiments of the utility model technology that it does not separate the essence of the corresponding technical solution
The spirit and scope of scheme.
Claims (8)
1. a kind of LNG cold energy use system, which is characterized in that including liquid phase heating zone subsystem, gas-liquid two-phase heating zone subsystem
System and gas phase heating zone subsystem；
The input terminal of liquid phase heating zone subsystem is connect with the output end of LNG low-lift pump, and the input terminal and LNG of LNG low-lift pump are defeated
Enter pipeline connection；
The output end of liquid phase heating zone subsystem is connect with the input terminal of Gas-liquid phase region heating subsystem, gas-liquid two-phase heating zone
The output end of subsystem is connect with the input terminal of gas phase heating zone subsystem, the output end and natural gas of gas phase heating zone subsystem
Export pipeline connection.
2. system according to claim 1, which is characterized in that the liquid phase heating zone subsystem specifically includes liquid phase region and changes
Hot device, liquid phase region circulatory mediator pump, liquid phase region circulatory mediator heat exchanger and liquid phase region expanding machine；
The LNG input terminal of liquid phase region heat exchanger is connect with the output end of LNG low-lift pump, the LNG output end of liquid phase region heat exchanger with
The input terminal of gas-liquid two-phase heating zone subsystem connects；
The medium input terminal of liquid phase region heat exchanger is connect with the output end of liquid phase region expanding machine, the medium output of liquid phase region heat exchanger
End is successively connect with the input terminal of liquid phase region circulatory mediator pump, liquid phase region circulatory mediator heat exchanger and liquid phase region expanding machine.
3. system according to claim 2, which is characterized in that mole of the circulatory mediator of the liquid phase heating zone subsystem
Group becomes methane 45-56%, ethane 30-50%, propane 10-20%, normal butane 5-7%, pentane 5-7%.
4. system according to claim 2, which is characterized in that the gas-liquid two-phase heating zone subsystem specifically includes gas-liquid
Two-phase section heat exchanger；
The LNG input terminal of Gas-liquid phase region heat exchanger is connect with the LNG output end of liquid phase region heat exchanger, Gas-liquid phase region heat exchanger
LNG output end connect with the input terminal of gas phase heating zone subsystem.
5. system according to claim 4, which is characterized in that the circulatory mediator of the gas-liquid two-phase heating zone subsystem
Dew-point temperature differs 1 to 2 DEG C with the bubble point temperature of LNG at the same pressure.
6. system according to claim 4, which is characterized in that the gas phase heating zone subsystem specifically includes gas phase zone and changes
Hot device, gas phase zone circulatory mediator pump, gas phase zone circulatory mediator heat exchanger and gas phase zone expanding machine；
The LNG input terminal of gas phase zone heat exchanger is connect with the LNG output end of Gas-liquid phase region heat exchanger, the day of gas phase zone heat exchanger
Right gas output end is connect with the input terminal of natural gas export pipeline；
The medium input terminal of gas phase zone heat exchanger is connect with the output end of gas phase zone expanding machine, the medium output of gas phase zone heat exchanger
End is successively connect with the input terminal of gas phase zone circulatory mediator pump, gas phase zone circulatory mediator heat exchanger and gas phase zone expanding machine.
7. system according to claim 6, which is characterized in that mole of the circulatory mediator of the gas phase heating zone subsystem
Group becomes ethane 30-55%, propane 25-40%, pentane 30-40%.
8. system according to claim 6, which is characterized in that
The waste heat input terminal of gas phase zone circulatory mediator heat exchanger is connect with seawater or industrial exhaust heat inlet line, and gas phase zone circulation is situated between
The waste heat output end of matter heat exchanger is connect with the waste heat input terminal of liquid phase region circulatory mediator heat exchanger, the heat exchange of liquid phase region circulatory mediator
The waste heat output end of device is connect with seawater or industrial exhaust heat outlet line.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113339909A (en) * | 2021-05-31 | 2021-09-03 | 青岛海信日立空调系统有限公司 | Heat pump air conditioning system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113339909A (en) * | 2021-05-31 | 2021-09-03 | 青岛海信日立空调系统有限公司 | Heat pump air conditioning system |
| CN113339909B (en) * | 2021-05-31 | 2022-06-03 | 青岛海信日立空调系统有限公司 | Heat pump air conditioning system |
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