CN207515353U - A kind of natural gas liquefaction system - Google Patents
A kind of natural gas liquefaction system Download PDFInfo
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- CN207515353U CN207515353U CN201721538734.0U CN201721538734U CN207515353U CN 207515353 U CN207515353 U CN 207515353U CN 201721538734 U CN201721538734 U CN 201721538734U CN 207515353 U CN207515353 U CN 207515353U
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Abstract
A kind of natural gas liquefaction system belongs to natural gas energy resource field, and in order to solve the problems, such as to reduce the energy consumption of natural gas system, technical essential is：Including heat exchanger, compressor set, injector, the heat exchanger is multiple-stage heat exchanger, heat exchanger connect compressor group, the connecting line in compressor set downstream has more than two parallel outlets thereon, one export pipeline of each outlet connection, each way outlet pipeline connects the entrance of an injector, the evaporation cavity of one section of heat exchanger of outlet connection of each injector, it is at least different there are two the capacity of injector in injector, the suction side of injector with higher capacity connects another capacity less than the evaporation cavity of that section of heat exchanger that its injector is connected by suction line.
Description
Technical field
The utility model belongs to natural gas energy resource field, is related to a kind of natural gas liquefaction system.
Background technology
In recent years, non-developed country's gas outlet is more and more.Since FLNG solutions have following advantage, thus
Obtain the attention of more and more owners.The advantage of FLNG：1. Wharf Construction expense is reduced, if air source comes from land,
Only an air supply pipe is needed to be connected on FLNG.If air source is directly connected to offshore gas field, FLNG is even more unique.2. subtract
The uncertainty of few local expropriation of land.3. all liquefaction, storage, handling etc. are all on FLNG, and FLNG can in industry prosperity
Area is built, and avoids the Unpredictability of construction cost and construction period.4. flexibly, as some regional air source exhaustion, Ke Yiyi
To other area productions.5. avoiding risk, it when somewhere generation upheaval, can remove in time, reduce owner's loss.Since sea is floating
The characteristics of formula device, the mixed refrigerant systems that construction cost is relatively low and equipment is less are not suitable for FLNG use environments.Ladder or
Cascade liquefaction system is most suitable for large-scale FLNG application scenarios.Since pervious liquefaction plant mainly considers rate of return on investment, not
Have and cost of consumed resource is more counted, that is to say, that as long as small investment return is high, resource consumption is placed on secondary position
It puts.But as attention of the energy exporting country to national resource, liquefaction system Energy Consumption Cost also gradually rise, owner must not
Think little of the energy consumption of system.
Utility model content
In order to solve the problems, such as to reduce the energy consumption of natural gas system, the utility model proposes following technical sides
Case：A kind of natural gas liquefaction system, including heat exchanger, compressor set, injector, the heat exchanger is multiple-stage heat exchanger, is changed
Hot device connect compressor group, the connecting line in compressor set downstream have more than two parallel outlets, each outlet thereon
An export pipeline is connected, each way outlet pipeline connects the entrance of an injector, and the outlet of each injector connects one section of heat exchange
The evaporation cavity of device, it is at least different there are two the capacity of injector in injector, have higher capacity injector suction side by
Suction line connects another capacity and is less than the evaporation cavity of that section of heat exchanger that its injector is connected.
The injector of each section of heat exchanger connection, capacity is from top to bottom reduces successively.
Each section of heat exchanger has upper and lower two-stage evaporation chamber, and the outlet of injector is connected under each section of heat exchanger
Section evaporation cavity, the outlet connect compressor group of the epimere evaporation cavity of each section of heat exchanger have the sucking of the injector of higher capacity
End connects another capacity less than the epimere evaporation cavity of heat exchanger that its injector is connected by suction line.
Connecting pipe between the compressor set and injector entrance is equipped with lime set collecting tank.
Connecting pipe in the downstream of the compressor set installs seawater heat exchanger, and the seawater heat exchanger is mounted on described
The upstream of lime set collecting tank, suction line installation screw down nonreturn valve, the pipeline installation between injector entrance and lime set collecting tank
Regulating valve.
The export pipeline has the one end for being connected to sub-cooling coil all the way, and the other end of sub-cooling coil is connected to a certain spray
The suction side of emitter, the injector are the injector of capacity minimum in each injector.
Connecting pipe in the downstream of the compressor set installs seawater heat exchanger, and the seawater heat exchanger is mounted on described
The upstream of lime set collecting tank, suction line installation screw down nonreturn valve, the pipeline installation between injector entrance and lime set collecting tank
Regulating valve, the suction line installation screw down nonreturn valve of the injector of the capacity minimum.
Advantageous effect：Improvement of the utility model mainly for classical ladder liquefaction system in terms of energy consumption is reduced,
And the improvement make system module construction cost it is limited it is increased under the premise of, and than expander system manufacture at low cost, reliability
It is high.Although injector has use in the liquefaction system of other types, such as high-pressure jet system uses injector, not
Method used by this system utility model is same as, the utility model is using the purpose of injector using its jet power,
Classification injection is formed, to reduce compressor work.
Description of the drawings
Fig. 1 sources material gas supply pressure is equal to the liquefaction system of 35bara；
Fig. 2 sources material gas supply pressure is less than the liquefaction system of 35bara；
Fig. 3 sources material gas supply pressure is higher than the liquefaction system of 35bara；
The schematic diagram of the multiple injector parallel connection methods of Fig. 4；
The re-liquefied systems of Fig. 5；
In figure：101A/B--- methane/LNG injectors；102H/L--- ethylene injectors；103H/M/L--- propane sprays
Device；201--- automatic cut-off valves；301/302/303 regulating valve；401/402/403--- screw down nonreturn valves；501--- expansion valves；
BOOST COMP--- booster compressors；METHANE COMP--- methane/natural gas compressor；ETHYLENE COMP--- ethylene
Compressor；PROPANE COMP--- propane compressors；EXC-1--- heat exchangers；EXC-2--- heat exchangers；EXC-3--- exchanges heat
Device；PROPANE CONDENSER--- propane condensators；ETHYLENE COOLER--- ethylene chillers；METHANE
COOLER--- methane coolers；V/L SEPARATOR--- gas liquid separation tanks；LIQUID RECEIVER--- lime set collecting tanks；
CONDENSATE TANK--- coagulation tanks.
Specific embodiment
Embodiment 1：As shown in the figure shown in 1, in order in the prior art (classical ladder system and optimization ladder system) into
One step reduces energy consumption, and the utility model includes four kinds of injectors for meeting different medium injection, meets different expansions respectively
The methane of pressure, LNG (air source gas), ethylene, propane Ye Qi areas, Ji Shi areas expansion requirements.
In ladder system, including methane moiety, ethylene moiety, propane part, in methane moiety, methane heat exchanger is passed through
For cooling medium BOG to be passed through cooled medium natural gas cooling therein, the natural gas is from air source gas, air source gas all the way
As cooled medium propane heat exchanger is passed directly into exchange heat with cooling medium propane, after be passed through ethylene heat exchanger, wherein with
Cool down the heat exchange of medium ethylene, after be passed through methane heat exchanger as cooled medium；Another way is from above-mentioned BOG, the BOG conducts
It cools down medium and pressurization is sucked, and be passed through propane heat exchanger again as cooled medium by cooler cooling by compressor after heat exchange
Heat exchange, after be passed through ethylene heat exchanger, wherein with cooling medium ethylene heat exchange, after be passed through methane heat exchanger and be situated between as cooled
Matter.Cooled medium natural gas in the methane heat exchanger after the BOG heat exchange of cooling medium by injector with being sprayed to gas-liquid point
From tank, after be passed through coagulation tank.
In ethylene moiety, it is that be passed through above-mentioned cooled medium therein natural that ethylene heat exchanger, which is passed through cooling medium ethylene,
Gas exchanges heat, and ethylene is sucked by compressor after heat exchange as cooling medium and pressurizeed, and is passed through propane heat exchange again by cooler cooling
Device as cooled media for heat exchange, after sprayed by injector to ethylene heat exchanger and become the cooling of the ethylene heat exchanger being passed through and be situated between
Matter.
In propane part, it is that be passed through above-mentioned cooled medium therein natural that propane heat exchanger, which is passed through cooling medium propane,
Gas exchanges heat, and propane is sucked by compressor after heat exchange as cooling medium and pressurizeed, and is passed through propane heat exchange again by cooler cooling
Device becomes cooling medium propane.
By said program：
The injector of ethylene moiety includes high pressure section injector 102H and low pressure stage injector 102L, the injection of propane part
Device is divided into high pressure section injector 103H, intermediate pressure section injector 103M and low pressure stage injector 103L.Injector 103H suction sides connect
It is connected to and sucks injector 103M and discharge and in the gases of EXC-3M sections of heat absorptions of heat exchanger, the connection of injector 103M suction sides
To and the gases that suck injector 103L discharges and absorb heat in EXC-3L section of heat exchanger, injector 103L suction sides are connected to
Ethylene sub-cooling coil exports.Injector 102H suction sides are connected to and suck injector 102L and discharge and in heat exchanger EXC-
The gas of 2L sections of heat absorptions, injector 102L are connected to and suck the outlet of natural gas/methane sub-cooling coil.Four kinds of media are wet more than making
The entropy increase and decrease of area's expansion process makes expansion process close to constant-enthalpy process, and the gas compression of part low-pressure area to higher pressure less
Power section reduces corresponding recycle compressor energy consumption.
Although injector and liquid expander have use in the liquefaction system of other types, such as high-pressure jet system
System is different from method used by this system utility model using injector etc., and in the prior art, injector is used to spray
Supercharging is penetrated, and the utility model selects injector to coordinate the connection of capacity difference, suction line, it acts as reduce compressor
Power.
In order to save energy consumption, following improvement is made：COMP. points of three sections of suckings of propane compressor PROPANE, it is corresponding to exchange heat
EXC-3 points of three sections of expansion heat exchanges of device.Ethylene compressor ETHYLENE COMP. are divided to two sections of suckings, and corresponding heat exchanger EXC-2 divides
Two sections of expansion heat exchanges.Methane/natural gas compressor, can be divided to two sections, three sections or four sections suckings, corresponding heat exchanger also same section
Number.Depend primarily on source material gas supply pressure and be liquefaction system or re-liquefied system.Re-liquefied system is not present
Source material gas supply problem, system is；For liquefaction system, the utility model provides three kinds of different situations：Supply pressure
Power is equal to 35bara, supply pressure is higher than 35bara less than 35bara, supply pressure.When supply pressure is less than 35bara, increase
Pressure, is increased to 35bara by one compressor；When supply pressure is higher than 35bara, using the injection of two different pressures grades
Device
Improvement of the utility model mainly for classical ladder liquefaction system in terms of energy consumption is reduced, and the improvement makes
System module construction cost it is limited it is increased under the premise of, and than expander system manufacture it is at low cost, reliability is high.Although injection
Device has use, such as high-pressure jet system using injector in the liquefaction system of other types, but is different from this system
Method used by utility model, the utility model are using the purpose of injector using its jet power, form classification spray
It penetrates, to reduce compressor work.As further effect, gas consumption reduces by more than 20% than classical ladder system.
Embodiment 2：In Fig. 1-4, COMP points three sections of propane compressor PROPANE is sucked, and suction pressure is respectively
1.4bara, 3.45bara, 7.3bara, discharge pressure 13.6bara are cold after propane condensator PROPANE CONDENSER
It coagulates and is collected into collecting tank LIQUID RECEIVER PROPANE, by the injector of the three different bulbs of pressure/temperature
103H/103M/103L respectively enters heat exchanger EXC-3H/M/L for cooling down ethylene, methane, natural gas, into being+40 DEG C, goes out
- 30 DEG C of mouth, ethylene are condensed in outlet.In addition ethylene sub-cooling coil all the way, for being subcooled outside the ethylene of condensation, effect is for spray
Emitter 103L provides the gas of consumption kinetic energy.Ethylene compressor ETHYLENE COMP are divided to two sections of suckings, and suction pressure is
5.3bara, discharge pressure 20bara are condensed and are collected by ethylene chiller ETHYLENE COOLER, heat exchanger EXC-3
In collecting tank LIQUID RECEIVER ETHYLENE, it is subcooled in collecting tank LIQUID RECEIVER ETHYLENE.By
Ethylene, methane and the natural gas of heat exchanger EXC-3 is cooled to -30 DEG C.The ethylene of supercooling is by the two different bulbs of pressure/temperature
The injector 102H/102L of degree respectively enters heat exchanger EXC-2H/L for cooling down methane and natural gas, in addition methane/day all the way
Right gas sub-cooling coil, for being subcooled outside the ethylene of condensation, effect is that the gas of consumption kinetic energy is provided for injector 102L.
This system is " methane " the media definitions of compressor cycle, the BOG actually evaporated in liquefied natural gas, only
It is that methane content is higher.External natural gas supply is defined as " natural gas ", i.e. air source gas.
Heat exchanger EXC-2H/L, into being -30 DEG C, exports -95 DEG C for further cooling down (condensation) methane and natural gas,
Methane and natural gas are condensed in outlet, enter injector 101A/B using sub-cooling coil supercooling, injector 101A/B suckings from
The gas that coagulation tank CONDENSER TANK are isolated, injector 101A/B outlets gas/liquid knockout drum V/L SAPARATOR pressure
For 2-2.5bara, the liquid in gas liquid separation tank V/L SAPARATOR passes through expansion valve 501 and enters coagulation tank CONDENSER
TANK, which further cools down/presses, makes up to whole liquefaction.The gas isolated from gas liquid separation tank V/L SAPARATOR is pressed
Contracting machine sucks
Embodiment 3：Entire liquefaction process is described in detail in the present embodiment, and the heat exchanger of ethylene and the compressor of ethylene connect,
The compressor connection seawater heat exchanger of ethylene, is passed through in the heat exchanger of propane by the ethylene of seawater heat exchanger and cools down, depressurizes, and
Further cool down in the lime set collecting tank of ethylene, two-way connection injector is sprayed by injector to the steaming of the heat exchanger of ethylene
Chamber is sent out, one end of the sub-cooling coil of the lime set recycling can of third road connection natural gas has the sucking of the injector of higher capacity
End connects another capacity less than the evaporation cavity of that section of heat exchanger that its injector is connected by suction line, by relatively low appearance
Ethylene in the corresponding heat exchanger of amount injector is transferred in the corresponding heat exchanger of injector of higher capacity, compared with low capacity
The suction side of injector is connected to the other end of sub-cooling coil, and air source gas and natural gas are passed through after exchanging heat in the heat exchanger of propane
The heat exchanger heat exchange of ethylene, and with after the sub-cooling coil heat exchange of the lime set collecting tank of natural gas, being passed through in the heat exchanger of natural gas,
And sprayed by injector to knockout drum, in coagulation tank is stored in；
BOG, and natural gas and air source in heat exchanger and in ethylene heat exchanger are passed through in the heat exchanger of natural gas
Gas exchanges heat, and is passed through natural gas compressor, is being passed through seawater heat exchanger, and be passed through in the heat exchanger of propane and cooled down by seawater heat exchanger
Decompression；
By upper, ethylene, natural gas, air source gas for cooling are passed through in the heat exchanger of propane, the heat exchanger of propane connects
The compressor set of propane is connect, seawater heat exchanger, the downstream of seawater heat exchanger are installed with the pipeline of propane compression unit outlet connection
The lime set collecting tank of propane is installed, the outlet connecting pipe road of lime set collecting tank has parallel outlet, and the outlet passes through each outlet
Pipeline is connected to the entrance of corresponding injector, and the outlet of each injector is connected to it and corresponds to the evaporation cavity of section heat exchanger, has
The suction side of the injector of higher capacity connects another capacity by suction line and is changed less than that section that its injector is connected
The evaporation cavity of hot device, the export pipeline of the lime set heat exchanger of propane have the one end for being connected to sub-cooling coil all the way, sub-cooling coil
The other end be connected to the suction side of a certain injector, the injector is the injector of capacity minimum in each injector.
By said program, realize air source gas propane, ethylene, natural gas heat exchanger in exchange heat to cool down step by step
Decompression, and ethylene also exchanges heat in the heat exchanger of propane with cooling decompression；So as to which air source gas can in ethylene heat exchanger
A greater degree of cooling decompression, and natural gas is exchanged heat in ethylene heat exchanger with cooling decompression, so as to air source gas and day
When exchanging heat with BOG, the BOG of equivalent can exchange heat to reach identical cooling decompression right gas with more natural gases and air source gas
Purpose.And the purpose of the sub-cooling coil in lime set collecting tank is to further utilize the heat transferring medium of more low temperature again
To the medium of heat transferring medium that has exchanged heat and will be output as cooling decompression again, utmostly to utilize cold energy, this
The means of the fine cooling decompression of kind, it is fine step by step to perform the utilization rate accumulation raising so that cold energy, and as Considerable effect
A kind of power save mode.
By the process, a kind of modified natural gas liquefaction system improves classical ladder liquefaction system, with tradition
Liquefaction system is compared, and injector is added in the node for the three reducing pressure by regulating flow/coolings that can utilize expansion work, to reduce expansion process
Entropy increase, reduce corresponding compressor power consumption by the way that the gas pressure of lower pressure is improved.Each injector
Driving end condenses collecting tank with cryogen by regulating valve and connect, and is connected at the top of injector suction side and relatively low one section of evaporator section, sprays
Emitter outlet is connected with heat exchanger evaporation cavity.
One of three reducing pressure by regulating flow/cooling node methane and liquefied natural gas node setting injector (101A/
101B), and the injector (101A/B) can be according to the injector of the one or more different capabilities of different occasions setting.
The ethylene node setting injector (102H/102M/102L) of one of three reducing pressure by regulating flow/cooling node, and it is described
Injector can set the injector of one or more different capabilities according to different application occasion.
The minimum bulbs of pressure/temperature spot in the ethylene reducing pressure by regulating flow/cooling node, injector suction side was connected to
Cooling coil, for further cooling down condensed methane and natural gas.
Another reducing pressure by regulating flow/cooling node, i.e. propane node setting injector (103H/103M/103L), and
The injector can set the injector of one or more different capabilities according to different application occasion.
The minimum bulbs of pressure/temperature spot in the propane reducing pressure by regulating flow/cooling node, injector suction side was connected to
Cooling coil, for further cooling down condensed ethylene.
The BOG grades suction side of methane/natural gas compressor is connected in heat exchanger EXC-1 by this modified liquefaction system,
The cold energy of gas is returned using holding bay and/or handling goods is subcooled methane/natural gas of condensation, improves liquefaction ratio.The spray
Emitter larynx diameter is automatic adjustment, ensures system effectiveness during power condition changing.
In one embodiment, which can be used in re-liquefied system, i.e., the utility model is not excluded for changing
Into the re-liquefied system of type LNG ladders.
The preferable specific embodiment of the above, only the invention, but the protection domain of the invention is not
This is confined to, in the technical scope that any one skilled in the art discloses in the invention, according to the present invention
The technical solution of creation and its inventive concept are subject to equivalent substitution or change, should all cover the invention protection domain it
It is interior.
Claims (7)
1. a kind of natural gas liquefaction system, including heat exchanger, compressor set, injector, which is characterized in that the heat exchanger is
Multiple-stage heat exchanger, heat exchanger connect compressor group, the connecting line in compressor set downstream have more than two parallel thereon
Outlet, one export pipeline of each outlet connection, each way outlet pipeline connect the entrance of an injector, the outlet of each injector
The evaporation cavity of one section of heat exchanger is connected, it is at least different there are two the capacity of injector in injector, there is the injection of higher capacity
The suction side of device connects another capacity less than the evaporation cavity of that section of heat exchanger that its injector is connected by suction line.
2. natural gas liquefaction system as described in claim 1, which is characterized in that the injection of each section of heat exchanger connection
Device, capacity is from top to bottom reduces successively.
3. natural gas liquefaction system as claimed in claim 1 or 2, which is characterized in that each section of heat exchanger has upper and lower
Two-stage evaporation chamber, the outlet of injector are connected to the hypomere evaporation cavity of each section of heat exchanger, the epimere evaporation cavity of each section of heat exchanger
Connect compressor group is exported, the suction side with the injector of higher capacity connects another capacity less than its spray by suction line
The epimere evaporation cavity for the heat exchanger that emitter is connected.
4. natural gas liquefaction system as claimed in claim 1 or 2, which is characterized in that the compressor set and injector entrance
Between connecting pipe lime set collecting tank is installed.
5. natural gas liquefaction system as claimed in claim 4, which is characterized in that the connecting tube in the downstream of the compressor set
Seawater heat exchanger is installed in road, and the seawater heat exchanger is mounted on the upstream of the lime set collecting tank, and suction line installation stops
Return valve, the pipeline installation and adjustment valve between injector entrance and lime set collecting tank.
6. natural gas liquefaction system as claimed in claim 4, which is characterized in that the export pipeline has to be connected to all the way
One end of cooling coil, the other end of sub-cooling coil are connected to the suction side of a certain injector, and the injector is in each injector
The injector of capacity minimum.
7. natural gas liquefaction system as claimed in claim 6, which is characterized in that the connecting tube in the downstream of the compressor set
Seawater heat exchanger is installed in road, and the seawater heat exchanger is mounted on the upstream of the lime set collecting tank, and suction line installation stops
Return valve, the pipeline installation and adjustment valve between injector entrance and lime set collecting tank, the suction line of the injector of the capacity minimum
Road is installed by screw down nonreturn valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721538734.0U CN207515353U (en) | 2017-11-17 | 2017-11-17 | A kind of natural gas liquefaction system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721538734.0U CN207515353U (en) | 2017-11-17 | 2017-11-17 | A kind of natural gas liquefaction system |
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| CN207515353U true CN207515353U (en) | 2018-06-19 |
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ID=62539115
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107990630A (en) * | 2017-11-17 | 2018-05-04 | 国鸿液化气机械工程（大连）有限公司 | Natural gas liquefaction system, the method for reducing compressor power consumption and the application in re-liquefied |
-
2017
- 2017-11-17 CN CN201721538734.0U patent/CN207515353U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107990630A (en) * | 2017-11-17 | 2018-05-04 | 国鸿液化气机械工程（大连）有限公司 | Natural gas liquefaction system, the method for reducing compressor power consumption and the application in re-liquefied |
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