CN208168940U - A kind of system that Large LNG receiving station utilizes cold energy of liquefied natural gas power generation - Google Patents
A kind of system that Large LNG receiving station utilizes cold energy of liquefied natural gas power generation Download PDFInfo
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- CN208168940U CN208168940U CN201821015254.0U CN201821015254U CN208168940U CN 208168940 U CN208168940 U CN 208168940U CN 201821015254 U CN201821015254 U CN 201821015254U CN 208168940 U CN208168940 U CN 208168940U
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Abstract
The utility model discloses the systems that a kind of Large LNG receiving station utilizes cold energy of liquefied natural gas power generation,There are three groups of independent heat exchanger channels in main heat exchanger,The entrance end for stating the first heat exchanger channels is connected separately with liquefied natural gas pipe and natural gas tube,The outlet end of second heat exchanger channels is connect with mixed working fluid surge tank,The outlet end of mixed working fluid surge tank is connect with mixed working fluid booster pump,The outlet end of mixed working fluid booster pump is connect with the input end of third heat exchanger channels,The outlet end of third heat exchanger channels is connected with mixed working fluid heater,The outlet end of mixed working fluid heater and the input end of expanding machine,The outlet end of expanding machine is connected with the input end of the second heat exchanger channels,Expanding machine is connected with generator,Electric energy is converted for LNG cold energy using the low temperature Rankine cycle of mixed working fluid,System controllability and variable working condition adaptability are good,Large-scale liquefied natural gas receiving station comprehensive utilization rate of energy source can be improved.
Description
Technical field
The utility model relates to technical field of power generation, utilize liquefied natural gas more particularly to a kind of Large LNG receiving station
The system of cold energy generation.
Background technique
LNG（Liquefied natural gas）It is a kind of high-efficiency cleaning energy, the Large LNG receiving station that China has put into operation at present has 14
Seat, build or proposed Large LNG receiving station there are also more than 10 seats.In Large LNG receiving station, wanted to meet gas distributing system conveying
It asks, LNG needs to be re-fed into gas distributing system after high-pressure pump pressurizes and is vaporizated into gas at normal temperature.LNG is wanted in vaporescence
A large amount of cold energy are discharged, traditional Large LNG receiving station uses seawater open-frame type gasifier（ORV）Or submerged combustion gasifier
（SCV）Come the LNG that gasifies, valuable cold energy is not only wasted, thermal pollution also is generated to surrounding waters.The mode of LNG cold energy use
Have cold energy space division, cold energy generation, freezer, ice making etc., wherein LNG cold energy generation because its industrial chain it is most short, generated energy, which can meet, to be connect
Receive station part from power load, not by the interference of the factors such as such as market, resource environment, transport, be most be worthy of popularization it is cold
It can Land use systems.
The mode of LNG cold energy generation mainly has the direct expansion power generation of natural gas, low temperature Rankine cycle power generation and cogeneration
Method.Defeated ductwork pressure is higher outside Chinese large-sized LNG receiving station natural gas, 6.0MPa ~ 10.0MPa is commonly reached, without available day
Right atmospheric pressure energy can only be generated electricity using low temperature Rankine cycle.Meanwhile different Large LNG receiving station natural gas component, pressure etc.
It all has differences, outer defeated operating condition changes with the different with gas demand of pipe network at runtime for Large LNG receiving station.Therefore,
The cold energy generation system requirements security of system of Large LNG receiving station is good, high reliablity, energy utilization efficiency are high, requires simultaneously
System controllability and variable working condition adaptability are good.
The mode of LNG cold energy generation mainly has the direct expansion power generation of natural gas, low temperature Rankine cycle power generation and cogeneration
Method.Defeated ductwork pressure is higher outside Chinese large-sized LNG receiving station natural gas, 6.0MPa ~ 10.0MPa is commonly reached, without available day
Right atmospheric pressure energy can only be generated electricity using low temperature Rankine cycle.Meanwhile different Large LNG receiving station natural gas component, pressure etc.
It all has differences, outer defeated operating condition changes with the different with gas demand of pipe network at runtime for Large LNG receiving station.Therefore,
The cold energy generation system requirements security of system of Large LNG receiving station is good, high reliablity, energy utilization efficiency are high, requires simultaneously
System controllability and variable working condition adaptability are good.It has been disclosed there are many method in this technical field.
Application No. is the patents of invention of 201610083798X to disclose a kind of technique and device using LNG cold energy generation,
It uses two independent circulations, is recycled cold energy using two kinds of refrigerants, whole process heat transfer temperature difference is small, changes to be effectively reduced
The exergy loss of thermal process improves cold energy use efficiency.Although this method is cold using the LNG of two kinds of refrigerant recovering difference warm areas
Can, but its entire technical process is made of multiple circulations, system complex, and dynamic equipment is excessive, and system variable working condition regulation performance is poor.
It is disclosed application No. is 2010101237285 patent of invention and a kind of improves generation efficiency of liquefied natural gas cold energy
Integrated optimization method.It includes refrigerant Rankine cycle power generation, ice water system and the direct expansion power generation system of natural gas, first by liquid
The refrigerant medium for changing natural gas and Rankine cycle exchanges heat, and cold energy is passed to working medium, and then working medium and cold water exchange heat, and production is certain
Air-conditioning system, compressor cascade EDFA and the inlet gas cooling of gas turbine etc. in the ice water supply receiving station region of amount；Simultaneously
Using the high-pressure natural gas after the low temperature exhaust heat heating vaporization of plant gas, direct expansion power generation is carried out.This method is a kind of LNG
The step Comprehensive Utilization Scheme of cold energy, needs and receiving station and entire receiving station region are cold and hot comprehensively considers and utilize, whole
A system relationship is big, and when defeated load variations outside LNG receiving station, system overall stability is not high, and matching is poor.
One kind, which is disclosed, application No. is 2012105101118 patent of invention recycles liquefaction day by working medium of hydrocarbon mixture
The method of right gas cold energy generation, the invention, with ambient enviroment, industrial exhaust heat etc. for high temperature heat source, pass through using LNG as low-temperature heat source
It recycles the energy productions mechanical energy such as the cold energy of LNG and generator is driven to generate electric power.But the invention does not refer to that mixed working fluid uses
The system and method for matching, supplementing in the process.
Application No. is 2015105823052 patents of invention to disclose a kind of complete set of equipments of novel LNG cold energy generation,
The invention recycles LNG cold energy using the Rankine cycle of single working medium, and cold energy recovery efficiency is lower.
Summary of the invention
The purpose of this utility model is that：Overcome the above-mentioned problems in the prior art, proposes that a kind of Large LNG receives
The system stood using cold energy of liquefied natural gas power generation, converts electric energy for LNG cold energy using the low temperature Rankine cycle of mixed working fluid,
The system is directed to Large LNG receiving station, and system is safe and reliable, and generating efficiency is high, system controllability and variable working condition adaptability
Good, large-scale liquefied natural gas receiving station comprehensive utilization rate of energy source can be improved in energy conservation and environmental protection.
The purpose of this utility model is realized by following technical proposals：
A kind of system that Large LNG receiving station utilizes cold energy of liquefied natural gas power generation, including：Main heat exchanger, mixed working fluid
There are in the main heat exchanger three groups independent to be changed for surge tank, mixed working fluid booster pump, mixed working fluid heater and expanding machine
The passage of heat, respectively：First heat exchanger channels, the second heat exchanger channels and third heat exchanger channels, the disengaging of first heat exchanger channels
Mouth end is connected separately with liquefied natural gas pipe and natural gas tube, the outlet end of second heat exchanger channels and mixed working fluid surge tank
Connection, the outlet end of the mixed working fluid surge tank are connect with mixed working fluid booster pump, the outlet of the mixed working fluid booster pump
End is connect with the input end of third heat exchanger channels, and the outlet end of the third heat exchanger channels is connected with mixed working fluid heater,
The outlet end of the mixed working fluid heater and the input end of expanding machine, the outlet end of the expanding machine and the second heat exchanger channels
Input end is connected, and the expanding machine is connected with generator.
The system that a kind of Large LNG receiving station of the utility model utilizes cold energy of liquefied natural gas power generation, the mixing work
Matter surge tank is connected with online allotment replenishment system.
The system that a kind of Large LNG receiving station of the utility model utilizes cold energy of liquefied natural gas power generation, the online tune
Include supply natural gas tube with replenishment system, is parallel with ethylene holding vessel, propylene holding vessel and fourth on the supply natural gas tube
Alkane holding vessel.
The system that a kind of Large LNG receiving station of the utility model utilizes cold energy of liquefied natural gas power generation, the ethylene storage
The outlet end for depositing tank is provided with ethylene gasifier, and it is dry that the propylene holding vessel and butane holding vessel outlet end are parallel with working medium
Device.
The system that a kind of Large LNG receiving station of the utility model utilizes cold energy of liquefied natural gas power generation, the natural gas
It is respectively arranged with autocontrol valve on pipe, ethylene holding vessel, propylene holding vessel and butane holding vessel, the autocontrol valve passes through
Controller is controlled, and signal is provided on the mixed working fluid surge tank and adopts device, and the signal adopts device and is connected with controller,
To realize the adjusting to autocontrol valve by the Parameters variation of mixed working fluid surge tank.
The system that a kind of Large LNG receiving station of the utility model utilizes cold energy of liquefied natural gas power generation, the main heat exchange
Device is high-pressure plate-fin heat exchanger.
The system that a kind of Large LNG receiving station of the utility model utilizes cold energy of liquefied natural gas power generation, the natural gas
Natural gas thermosistor is provided on pipe.
The system that a kind of Large LNG receiving station of the utility model utilizes cold energy of liquefied natural gas power generation, the natural gas
Thermosistor and mixed working fluid heater are open-frame type gasifier or submerged combustion gasifier.
The system that a kind of Large LNG receiving station of the utility model utilizes cold energy of liquefied natural gas power generation, the natural gas
The heat source of thermosistor and mixed working fluid heater is seawater.
According to the above technical scheme, the utility model has the beneficial effects that：It is proposed that a kind of Large LNG receiving station utilizes liquefaction
The system of natural gas cold energy power generation, converts electric energy for LNG cold energy using the low temperature Rankine cycle of mixed working fluid, which is directed to
Large LNG receiving station, system is safe and reliable, and generating efficiency is high, and system controllability and variable working condition adaptability are good, energy-saving ring
It protects, large-scale liquefied natural gas receiving station comprehensive utilization rate of energy source can be improved, and carry out by the composition to mixed working fluid
Line analysis is deployed and is supplemented online to mixed working fluid automatically, guarantees efficiency when system variable parameter operation.
Detailed description of the invention
Fig. 1 is the system schematic that a kind of Large LNG receiving station of the utility model utilizes cold energy of liquefied natural gas power generation.
Specific embodiment
The utility model is further described with attached drawing combined with specific embodiments below.
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Such as the implementation that Fig. 1 is the system that a kind of Large LNG receiving station of the utility model is generated electricity using cold energy of liquefied natural gas
Example, a kind of system that Large LNG receiving station utilizes cold energy of liquefied natural gas power generation, including：Main heat exchanger EO1, mixed working fluid are slow
Tank is rushed (in sv01, mixed working fluid booster pump PO1, mixed working fluid heater EO3 and expanding machine ET01, the main heat exchanger EO1
With three groups of independent heat exchanger channels, respectively：First heat exchanger channels, the second heat exchanger channels and third heat exchanger channels, described
The entrance end of one heat exchanger channels is connected separately with liquefied natural gas pipe 1 and natural gas tube 2, the outlet of second heat exchanger channels
(sv01 is connect, mixed working fluid surge tank (outlet end of sv01 and the mixed working fluid booster pump with mixed working fluid surge tank at end
The outlet end of PO1 connection, the mixed working fluid booster pump PO1 is connect with the input end of third heat exchanger channels, the third heat exchange
The outlet end in channel is connected with mixed working fluid heater EO3, the outlet end of the mixed working fluid heater EO3 and expanding machine
The outlet end of the input end of ET01, the expanding machine ET01 is connected with the input end of the second heat exchanger channels, the expanding machine
ET01 is connected with generator, and (sv01's mixed working fluid surge tank is connected with online allotment replenishment system, the online tune
Include supply natural gas tube 3 with replenishment system, is parallel with ethylene holding vessel V11, propylene holding vessel on the supply natural gas tube 3
V12 and butane holding vessel V13, the outlet end of the ethylene holding vessel V11 are provided with ethylene gasifier AV11, the propylene storage
Tank V12 and the outlet end butane holding vessel V13 are parallel with working medium drier A11, the supply natural gas tube 3, ethylene holding vessel
It is respectively arranged with autocontrol valve on V11, propylene holding vessel V12 and butane holding vessel V13, the autocontrol valve passes through control
Device is controlled, and the mixed working fluid surge tank (is provided with signal and adopts device, the signal adopts device and is connected with controller on sv01
It connects, so that (Parameters variation of sv01 realizes the adjusting to autocontrol valve, and mixed working fluid is by first by mixed working fluid surge tank
Alkane, ethylene, four kinds of hydro carbons of propane and butane are formed in following ratio, methane 30%mol%, similarly hereinafter, ethylene 28%, propane 33%, fourth
Alkane 9%, under this operating condition, about 40 KW of LNG generated energy per ton can pass through mixing when LNG temperature, pressure, component change
Working medium deploys replenishment system online, on-line analysis is carried out by the composition to mixed working fluid in the process of running, automatically to mixing
Working medium is deployed and is supplemented online, guarantees efficiency when system variable parameter operation.In the present embodiment, when LNG temperature is -130
DEG C ~ -154 DEG C between when changing, about 30 ~ 50 KW of LNG generated energy per ton, the main heat exchanger EO1 are high pressure plate fin heat-exchanging
Device is provided with natural gas thermosistor E02, the natural gas thermosistor E02 and mixed working fluid heater on the natural gas tube 2
EO3 is open-frame type gasifier or submerged combustion gasifier, the natural gas thermosistor E02 and mixed working fluid heater EO3
Heat source be seawater, the mixed working fluid booster pump P01 be tubular-bag tyep immersed pump, the mixed working fluid expanding machine ET01
For radial-inflow turboexpaner, the generator is synchronous generator.
The first situation, as LNG receiving station high pressure LNG, group is divided into lean solution, and -145 DEG C of pressure 9.5MPa, temperature pass through
Pipeline is connected with the first heat exchanger channels of main heat exchanger E01, exchanges heat in main heat exchanger E01 and gaseous mixed working fluid, cold energy is passed
Go out main heat exchanger E01 in -30 DEG C to after mixed working fluid, subsequently into natural gas thermosistor E02, by heating of seawater to more than 1
DEG C enter outer defeated pipe network；Gaseous mixed working fluid enters mixing after being condensed into -130 DEG C of liquid by LNG in main heat exchanger E01
Then working medium storage tank SV01 is mixed working medium immersed pump P01 and is forced into 1.6 MPa of high pressure, returns again to main heat exchanger E01 re-heat
Go out main heat exchanger E01 to -30 DEG C, subsequently into mixed working fluid heater E03 by after heating of seawater to certain temperature, into expansion
The expanding end expansion of machine ET01 drives electrical power generators, converts electric energy for LNG cold energy, mixed working fluid pressure 0.4 after expansion
MPa。
Second situation is rich solution as the LNG, and pressure is 7 MPa, and temperature is -152 DEG C.By online mixing system, mix
Conjunction working medium is made of methane, ethylene, three kinds of hydro carbons of propane in following ratio, methane 32.5%, ethylene 28%, and propane 39.5% is per ton
About 45 KW of LNG generated energy.
Working principle is：High pressure LNG（Liquefied natural gas）It is risen after cold energy is passed to mixed working fluid into main heat exchanger E01
Go out main heat exchanger E01 after temperature to certain temperature, temperature is required by heating of seawater to outer defeated pipe network subsequently into natural gas thermosistor E02
Go out electricity generation system after degree；Gaseous state mixed working fluid is condensed into liquid after absorbing LNG cold energy with LNG heat exchange in main heat exchanger E01, low
Warm liquid mixed working fluid enters back into mixed working fluid booster pump P01 pressurization after entering mixed working fluid surge tank SV01, pressurized mixed
It closes working medium and returns again after main heat exchanger E01 re-heat to go out master and change, utilize heating of seawater to mistake subsequently into mixed working fluid heater E03
Enter expanding machine group ET01 expanding end after hot, in expansion process, expanding machine drives electrical power generators, and LNG cold energy is converted
For electric energy, the mixed working fluid after expansion is again introduced into main heat exchanger E01 and completes a circulation.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (9)
1. the system that a kind of Large LNG receiving station utilizes cold energy of liquefied natural gas power generation, which is characterized in that including：Main heat exchanger
（EO1）, mixed working fluid surge tank (sv01）, mixed working fluid booster pump（PO1）, mixed working fluid heater（EO3）And expanding machine
（ET01）, the main heat exchanger（EO1）Inside there are three groups of independent heat exchanger channels, respectively：First heat exchanger channels, the second heat exchange
The entrance end of channel and third heat exchanger channels, first heat exchanger channels is connected separately with liquefied natural gas pipe（1）With it is natural
Tracheae（2）, outlet end and the mixed working fluid surge tank (sv01 of second heat exchanger channels）Connection, the mixed working fluid surge tank
(sv01）Outlet end and mixed working fluid booster pump（PO1）Connection, the mixed working fluid booster pump（PO1）Outlet end and third
The input end of heat exchanger channels connects, the outlet end of the third heat exchanger channels and mixed working fluid heater（EO3）It is connected, it is described
Mixed working fluid heater（EO3）Outlet end and expanding machine（ET01）Input end, the expanding machine（ET01）Outlet end with
The input end of second heat exchanger channels is connected, the expanding machine（ET01）It is connected with generator.
2. the system that a kind of Large LNG receiving station according to claim 1 utilizes cold energy of liquefied natural gas power generation, feature
It is：Mixed working fluid surge tank (the sv01）It is connected with online allotment replenishment system.
3. the system that a kind of Large LNG receiving station according to claim 2 utilizes cold energy of liquefied natural gas power generation, feature
It is：The online allotment replenishment system includes supply natural gas tube（3）, the supply natural gas tube（3）On be parallel with ethylene
Holding vessel（V11）, propylene holding vessel（V12）With butane holding vessel（V13）.
4. the system that a kind of Large LNG receiving station according to claim 3 utilizes cold energy of liquefied natural gas power generation, feature
It is：The ethylene holding vessel（V11）Outlet end be provided with ethylene gasifier（AV11）, the propylene holding vessel（V12）With
Butane holding vessel（V13）Outlet end is parallel with working medium drier（A11）.
5. the system that a kind of Large LNG receiving station according to claim 4 utilizes cold energy of liquefied natural gas power generation, feature
It is：The supply natural gas tube（3）, ethylene holding vessel（V11）, propylene holding vessel（V12）With butane holding vessel（V13）Upper point
It is not provided with autocontrol valve, the autocontrol valve is controlled by controller, the mixed working fluid surge tank (sv01）
On be provided with signal and adopt device, the signal adopts device and is connected with controller, to pass through mixed working fluid surge tank (sv01）Ginseng
The adjusting to autocontrol valve is realized in number variation.
6. the system that a kind of Large LNG receiving station according to claim 1 utilizes cold energy of liquefied natural gas power generation, feature
It is：The main heat exchanger（EO1）For high-pressure plate-fin heat exchanger.
7. the system that a kind of Large LNG receiving station according to claim 1 utilizes cold energy of liquefied natural gas power generation, feature
It is：The natural gas tube（2）On be provided with natural gas thermosistor（E02）.
8. the system that a kind of Large LNG receiving station according to claim 7 utilizes cold energy of liquefied natural gas power generation, feature
It is：The natural gas thermosistor（E02）With mixed working fluid heater（EO3）For open-frame type gasifier or submerged combustion gas
Change device.
9. the system that a kind of Large LNG receiving station according to claim 7 utilizes cold energy of liquefied natural gas power generation, feature
It is：The natural gas thermosistor（E02）With mixed working fluid heater（EO3）Heat source be seawater.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821015254.0U CN208168940U (en) | 2018-06-29 | 2018-06-29 | A kind of system that Large LNG receiving station utilizes cold energy of liquefied natural gas power generation |
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| CN201821015254.0U CN208168940U (en) | 2018-06-29 | 2018-06-29 | A kind of system that Large LNG receiving station utilizes cold energy of liquefied natural gas power generation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108678824A (en) * | 2018-06-29 | 2018-10-19 | 中海油能源发展股份有限公司珠海冷能利用分公司 | A kind of Large LNG receiving station utilizes the system and method for cold energy of liquefied natural gas power generation |
| CN112682296A (en) * | 2020-12-30 | 2021-04-20 | 中国核电工程有限公司 | Emergency power system for nuclear power plant and power system of nuclear power plant |
-
2018
- 2018-06-29 CN CN201821015254.0U patent/CN208168940U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108678824A (en) * | 2018-06-29 | 2018-10-19 | 中海油能源发展股份有限公司珠海冷能利用分公司 | A kind of Large LNG receiving station utilizes the system and method for cold energy of liquefied natural gas power generation |
| CN112682296A (en) * | 2020-12-30 | 2021-04-20 | 中国核电工程有限公司 | Emergency power system for nuclear power plant and power system of nuclear power plant |
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Effective date of registration: 20221028 Address after: No. 293, Tanggu East 6th Road, Binhai New Area, Tianjin 300450 Patentee after: CNOOC Energy Development Co.,Ltd. Clean Energy Branch Patentee after: SICHUAN AIR SEPARATION PLANT (Group) Co.,Ltd. Address before: 7th Floor, Agricultural Bank of China Building, No. 2042, Fenghuang North Road, Xiangzhou District, Zhuhai City, Guangdong Province, 519009 Patentee before: CNOOC ZHUHAI COLD ENERGY UTILIZATION BRANCH Patentee before: SICHUAN AIR SEPARATION PLANT (Group) Co.,Ltd. |