CN204552851U - A kind of process system utilizing cold energy of liquefied natural gas to generate electricity - Google Patents
A kind of process system utilizing cold energy of liquefied natural gas to generate electricity Download PDFInfo
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- CN204552851U CN204552851U CN201520036903.5U CN201520036903U CN204552851U CN 204552851 U CN204552851 U CN 204552851U CN 201520036903 U CN201520036903 U CN 201520036903U CN 204552851 U CN204552851 U CN 204552851U
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Abstract
The utility model relates to a kind of process system utilizing cold energy of liquefied natural gas to generate electricity, it is characterized in that: the first entrance of the LNG-working fluid heat exchanger that it comprises is connected with LNG pipeline, its first outlet is connected with rock gas-thermal source heat exchanger, second entrance of LNG-working fluid heat exchanger and first of working medium separator exports and is connected, and its second outlet is connected with the first entrance of working medium mixer; Second outlet of working medium separator is connected with the first entrance of working medium-working fluid heat exchanger, and the first outlet of working medium-working fluid heat exchanger is connected with the second entrance of working medium mixer; The outlet of working medium mixer is connected with the entrance of working medium transfer pump, working medium conveying delivery side of pump is connected with working medium-working fluid heat exchanger second entrance, working medium-working fluid heat exchanger second exports and is connected with the entrance of turbo-expander-generator set through working medium-thermal source heat exchanger, and the outlet of turbo-expander-generator set is connected with the entrance of working medium separator.
Description
Technical field
The utility model relates to a kind of power generation system, particularly about a kind of process system utilizing cold energy of liquefied natural gas to generate electricity.
Background technique
LNG Liquefied natural gas (LNG) is the cryogenic liquide of a kind of temperature about-162 DEG C at ambient pressure.The LNG receiving station that China's Coastal Areas builds and plan and more than 20 will be reached in the receiving station built.When the time comes, annual umber of feed inlet will carry huge cold energy with the LNG of ten million ton.LNG needed gasification heating (conventional method adopts seawater gasification heating) before being supplied to downstream user, and in gasification heating process, LNG will discharge a large amount of cold energy, and its energy density is about 860 ~ 830kJ/kg.If this part cold energy is all utilized, then its theoretical recyclable electricity is maximum can reach about 240KWh/t.Expect 12.2% (with the pipe of reinforced concrete at Three Gorges Power Station annual generating gauge in 2012) that the available energy of the year two thousand twenty coastal area of china LNG cold energy is about the annual generated energy of pipe of reinforced concrete at Three Gorges Power Station.Visible, if be used by cold energy, its economic value is considerable, and does not consume fuel itself, also can not produce any additional pollution.
Along with rising steadily of the primary energy such as crude oil and coal price, the basic production factor costs such as electric power will go up thereupon, and the economic value of LNG cold energy use will improve further.Therefore along with China's economic and social further developing, the energy-consuming demand still amount of increasing by a fairly big margin, improves comprehensive utilization rate of energy source, and strengthening power-saving technology will be the emphasis paid close attention to from now on.And cold energy generation is that the discarded cold energy that LNG produces at gasification production link is converted into the technology of high energy (electric energy), being the effective means improving energy utilization rate, is a kind ofly large-scale recovery can utilize the recycling economy mode of receiving station's cold energy.Its basic principle is generally by a kind of cryogenic power generation cycle process, is low temperature cold source with LNG, and the mechanical work utilizing cryogenic power generation cycle to produce drives generator set to produce electric power.Make full use of LNG high-quality cold energy, not only will have very important theory and realistic meaning to energy-saving and emission-reduction.In the middle of all multi-methods reclaiming LNG cold energy at present, LNG cold energy generation is that most probable utilizes LNG cold energy on a large scale, and industrial applications is the most extensive, is also the method that technology is comparatively ripe simultaneously.On the one hand, LNG cold energy is used for power generation system, and its industrial chain is very short, does not substantially disturb by other extraneous factor.On the other hand, utilize the cold energy of LNG to generate electricity, the cold energy of LNG major part temperature section can be reclaimed.
Existingly utilize in the method for LNG cold energy generation, the technology path of generating mainly comprises LNG direct expansion generating and the Rankine cycle generating of coolant media in the middle of utilizing, and Land use systems is then divided into pressure electricity-generating and low temperature cold to generate electricity two classes.Direct expansion generating utilizes LNG itself as generating working medium, and the pressure energy of LNG is converted into mechanical energy; Rankine cycle is then utilize the cryogenic cold energy of LNG to generate electricity by coolant media.At present, Japan is one of country utilizing LNG cold energy generation maximum, and the electric motor power of cold energy generation device, generally between 400 ~ 9400kW, has the power generation system that direct expansion power generation system, Rankine cycle power generation system and direct expansion combine with Rankine cycle.And the LNG receiving station of China and Japan different.The LNG receiving station of China, substantially all require that the rock gas after gasifying can directly enter high-pressure natural gas pipe network, pressure is between 7Mpa ~ 10Mpa, direct expansion method generation mode only just can be used when the discharge pressure of rock gas requires lower, the outer defeated distance of China's gas, the outer defeated pressure ratio of LNG is higher, and does not allow step-down to cold energy use project, causes cold energy generation can only can not use pressure electricity-generating with the low temperature cold of LNG.In most cases, in order to ensure that ductwork pressure cannot utilize direct expansion method.Therefore the LNG receiving station of China can in time consider to use low temperature Rankine cycle power generation system.And at present, China is not also at the commercial plant utilizing LNG cold energy to generate electricity built or put into operation.Even the LNG receiving station of the external overwhelming majority uses Rankine cycle power generation system, be also the simplest Rankine cycle system, the cycle fluid of use is mainly single propane medium, and in systemic circulation, cold energy reuse efficiency is very low.
Summary of the invention
For the problems referred to above, the purpose of this utility model is to provide the high process system utilizing cold energy of liquefied natural gas to generate electricity of a kind of cold energy use efficiency.
For achieving the above object, the utility model takes following technological scheme: a kind of process system utilizing cold energy of liquefied natural gas to generate electricity, it is characterized in that: it comprises LNG-working fluid heat exchanger, rock gas-thermal source heat exchanger, working medium separator, working medium mixer, working medium-working fluid heat exchanger, working medium transfer pump, working medium-thermal source heat exchanger and turbo-expander-generator set, first entrance of described LNG-working fluid heat exchanger is connected with LNG pipeline, its first outlet is connected with described rock gas-thermal source heat exchanger, second entrance of described LNG-working fluid heat exchanger exports with first of described working medium separator and is connected, its second outlet is connected with the first entrance of described working medium mixer, second outlet of described working medium separator is connected with the first entrance of described working medium-working fluid heat exchanger, and the first outlet of described working medium-working fluid heat exchanger is connected with the second entrance of described working medium mixer, the outlet of described working medium mixer is connected with the entrance of described working medium transfer pump, described working medium conveying delivery side of pump is connected with described working medium-working fluid heat exchanger second entrance, described working medium-working fluid heat exchanger second exports and is connected through the entrance of described working medium-thermal source heat exchanger with described turbo-expander-generator set, and the outlet of described turbo-expander-generator set is connected with the entrance of described working medium separator.
Thermal source in described rock gas-thermal source heat exchanger and working medium-thermal source heat exchanger adopts the circulating water of environment, seawater, other commercial plant, industrial waste heat, waste heat or refrigerant.
Described LNG-working fluid heat exchanger and working medium-working fluid heat exchanger all adopt plate-fin heat exchanger.
Described rock gas-thermal source heat exchanger and working medium-thermal source heat exchanger all adopt the shell of pipe type vaporizer of open-shelf heat exchanger, submerged combustion vaporizer or band intermediate heat medium.
Described working medium-set up a working medium gas-liquid separator between thermal source heat exchanger and turbo-expander-generator set, sets up a working medium air and liquid mixer between described turbo-expander-generator set and working medium separator; The entrance of described working medium gas-liquid separator is connected with the outlet of described working medium-thermal source heat exchanger, first outlet of described working medium gas-liquid separator is connected with the entrance of described turbo-expander-generator set, second outlet of described working medium gas-liquid separator is connected with the first entrance of described working medium air and liquid mixer, described turbo-expander-generator set outlet is connected with the second entrance of described working medium air and liquid mixer, and the outlet of described working medium air and liquid mixer is connected with the entrance of described working medium separator.
The utility model is owing to taking above technological scheme, it has the following advantages: 1, the utility model is divided into two strands by from turbo-expander-generator set working medium out due to working medium separator, first burst of working medium enter in LNG-working fluid heat exchanger with enter in working medium mixer as after the LNG Liquefied natural gas heat exchange of low-temperature receiver, second burst of working medium enters in working medium-working fluid heat exchanger and enters after heat release in working medium mixer, the cold of LNG can either be effectively utilized, the heat absorbed from the external world can be reduced again, make full use of the available energy in system, therefore the utility model can make the cold energy of LNG Liquefied natural gas in whole system obtain maximizing application, the unit generated energy of further raising whole system.2, for adapting to the demands such as different its natural gas liquid, pressure and thermal source, the one-tenth that the utility model can adjust working medium is neatly grouped into, thus reduces the heat exchange loss of institute's use heat exchanger as far as possible, improves the cold energy use efficiency of LNG Liquefied natural gas.3, the utility model only adopts one-level refrigeration cycle just can realize the recovery of cold energy due to LNG Liquefied natural gas, and therefore the utility model has the advantages that technological process is simple, energy utilization efficiency is high.4, the utility model is low due to the pressure of the working medium entering working medium separator after expansion work, therefore can save the equipment investment of cascade utilization project.5, the utility model may be used solely to generating, also can use with gas cold energy use item association, or apply with other waste heats, used heat item association.
Accompanying drawing explanation
Fig. 1 is the structural representation of the process system that the utility model utilizes cold energy of liquefied natural gas to generate electricity;
Fig. 2 is the structural representation after process system that the utility model utilizes cold energy of liquefied natural gas to generate electricity sets up working medium gas-liquid separator and working medium air and liquid mixer.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in detail.
As shown in Figure 1, the process system that the utility model utilizes cold energy of liquefied natural gas to generate electricity comprises LNG-working fluid heat exchanger 1, rock gas-thermal source heat exchanger 2, working medium separator 3, working medium mixer 4, working medium-working fluid heat exchanger 5, working medium transfer pump 6, working medium-thermal source heat exchanger 7 and turbo-expander-generator set 8.First entrance of LNG-working fluid heat exchanger 1 is connected with LNG pipeline, its first outlet is connected with rock gas-thermal source heat exchanger 2, second entrance of LNG-working fluid heat exchanger 1 and first of working medium separator 3 exports and is connected, and its second outlet is connected with the first entrance of working medium mixer 4.Second outlet of working medium separator 3 is connected with the first entrance of working medium-working fluid heat exchanger 5, and the first outlet of working medium-working fluid heat exchanger 5 is connected with the second entrance of working medium mixer 4.The outlet of working medium mixer 4 is connected with the entrance of working medium transfer pump 6, the outlet of working medium transfer pump 6 is connected with working medium-working fluid heat exchanger 5 second entrance, working medium-working fluid heat exchanger 5 second outlet is connected with the entrance of turbo-expander-generator set 8 through working medium-thermal source heat exchanger 7, and the outlet of turbo-expander-generator set 8 is connected with the entrance of working medium separator 3.
The power generation process of the process system that the utility model utilizes cold energy of liquefied natural gas to generate electricity is:
Working medium after turbo-expander-generator set 8 expansion power generation enters in working medium separator 3, and working medium is divided into two strands by working medium separator 3.First burst of working medium enters in LNG-working fluid heat exchanger 1, LNG Liquefied natural gas as low-temperature receiver continues in input LNG-working fluid heat exchanger 1 by LNG pipeline, first burst of working medium and LNG Liquefied natural gas heat exchange in LNG-working fluid heat exchanger 1, enter in working medium mixer 4 after first burst of working medium heat release cooling, LNG Liquefied natural gas becomes rock gas after absorbing heat gasification; Rock gas enter in rock gas-thermal source heat exchanger 2 with thermal source heat exchange.Second burst of working medium enters in working medium-working fluid heat exchanger 5 and enters in working medium mixer 4 after heat release cooling.Become one working medium after working medium after two bursts of heat release coolings mixes in working medium mixer 4, this burst of working medium is transported in working medium-working fluid heat exchanger 5 through working medium transfer pump 6.Working medium absorbs after heat heats up and enters working medium-thermal source heat exchanger 7 in working medium-working fluid heat exchanger 5, working medium continue in working medium-thermal source heat exchanger 7 absorb heat heat up after enter in turbo-expander-generator set 8, the working medium after secondary temperature elevation in turbo-expander-generator set 8 expansion work and drive electrical generators generating.Working medium after expansion work enters in working medium separator 3, and working medium is divided into two strands by working medium separator 3, completes and once circulates.
In above-described embodiment, after entering the heat of the absorbing natural gas thermal source in rock gas-thermal source heat exchanger 2, temperature raises, and natural gas temperature reaches and above zero enters gas distributing system.
In above-described embodiment, for ease of the cold energy of further cascade utilization LNG Liquefied natural gas, the thermal source in rock gas-thermal source heat exchanger 2 and working medium-thermal source heat exchanger 7 can adopt the circulating water of environment, seawater, other commercial plant, industrial waste heat, waste heat or refrigerant etc.
In above-described embodiment, working medium can adopt in organic working medium or inorganic working medium one or more, but be not only defined in this.For adapting to the demands such as different its natural gas liquid, pressure and thermal source, the one-tenth that can adjust working medium is flexibly grouped into, thus reduce the heat exchange loss of LNG-working fluid heat exchanger 1, rock gas-thermal source heat exchanger 2, working medium-working fluid heat exchanger 5 and working medium-thermal source heat exchanger 7 as far as possible, improve the cold energy use efficiency of LNG Liquefied natural gas.
In above-described embodiment, LNG-working fluid heat exchanger 1 and working medium-working fluid heat exchanger 5 can adopt plate-fin heat exchanger, but are not limited to this.
In above-described embodiment, rock gas-thermal source heat exchanger 2 and working medium-thermal source heat exchanger 7 can adopt the shell of pipe type vaporizer IFV of open-shelf heat exchanger ORV, submerged combustion vaporizer SCV or band intermediate heat medium, but are not limited to this.
As shown in Figure 2, for preventing from the gasification of the working medium after secondary temperature elevation out of working medium-thermal source heat exchanger 7 not exclusively, in working medium-set up a working medium gas-liquid separator 9 between thermal source heat exchanger 7 and turbo-expander-generator set 8, between turbo-expander-generator set 8 and working medium separator 3, set up a working medium air and liquid mixer 10.Wherein, the entrance of working medium gas-liquid separator 9 is connected with the outlet of working medium-thermal source heat exchanger 7, first outlet of working medium gas-liquid separator 9 is connected with the entrance of turbo-expander-generator set 8, second outlet of working medium gas-liquid separator 9 is connected with the first entrance of working medium air and liquid mixer 10, turbo-expander-generator set 8 outlet is connected with the second entrance of working medium air and liquid mixer 10, and the outlet of working medium air and liquid mixer 10 is connected with the entrance of working medium separator 3.
Enter working medium gas-liquid separator 9 from working medium-thermal source heat exchanger 7 working medium out, enter expansion work in turbo-expander-generator set 8 through the isolated gaseous working medium of working medium gas-liquid separator 9, the gaseous working medium after expansion work enters in working medium air and liquid mixer 10; Also enter in working medium air and liquid mixer 10 through the isolated liquid refrigerant of working medium gas-liquid separator 9, after gaseous working medium after expansion work mixes in working medium air and liquid mixer 10 with isolated liquid refrigerant, enter in working medium separator 3, this burst of working medium is divided into two strands by working medium separator 3, enters next circulation.
It should be noted that, the utility model is not limited to above-mentioned embodiment, above-mentioned embodiment is only schematic, be not restrictive, those of ordinary skill in the art, under enlightenment of the present utility model, is not departing under the ambit that aim of the present utility model and claim protect, a lot of accommodation can also be made, such as under the principle of technological process, choosing of working medium component also can change, and can change component or increase and decrease component; In the selection of thermal source, be also not limited only to that the utility model mentions, certain available refrigerant also can be selected to carry out heat exchange, so that further gradient utilization system cold energy, these all belong within protection domain of the present utility model.
Claims (6)
1. the process system utilizing cold energy of liquefied natural gas to generate electricity, it is characterized in that: it comprises LNG-working fluid heat exchanger, rock gas-thermal source heat exchanger, working medium separator, working medium mixer, working medium-working fluid heat exchanger, working medium transfer pump, working medium-thermal source heat exchanger and turbo-expander-generator set, first entrance of described LNG-working fluid heat exchanger is connected with LNG pipeline, its first outlet is connected with described rock gas-thermal source heat exchanger, second entrance of described LNG-working fluid heat exchanger exports with first of described working medium separator and is connected, its second outlet is connected with the first entrance of described working medium mixer, second outlet of described working medium separator is connected with the first entrance of described working medium-working fluid heat exchanger, and the first outlet of described working medium-working fluid heat exchanger is connected with the second entrance of described working medium mixer, the outlet of described working medium mixer is connected with the entrance of described working medium transfer pump, described working medium conveying delivery side of pump is connected with described working medium-working fluid heat exchanger second entrance, described working medium-working fluid heat exchanger second exports and is connected through the entrance of described working medium-thermal source heat exchanger with described turbo-expander-generator set, and the outlet of described turbo-expander-generator set is connected with the entrance of described working medium separator.
2. a kind of process system utilizing cold energy of liquefied natural gas to generate electricity as claimed in claim 1, is characterized in that: the thermal source in described rock gas-thermal source heat exchanger and working medium-thermal source heat exchanger adopts the circulating water of environment, seawater, other commercial plant, industrial waste heat, waste heat or refrigerant.
3. a kind of process system utilizing cold energy of liquefied natural gas to generate electricity as claimed in claim 1, is characterized in that: described LNG-working fluid heat exchanger and working medium-working fluid heat exchanger all adopt plate-fin heat exchanger.
4. a kind of process system utilizing cold energy of liquefied natural gas to generate electricity as claimed in claim 2, is characterized in that: described LNG-working fluid heat exchanger and working medium-working fluid heat exchanger all adopt plate-fin heat exchanger.
5. a kind of process system utilizing cold energy of liquefied natural gas to generate electricity as claimed in claim 1 or 2 or 3 or 4, is characterized in that: described rock gas-thermal source heat exchanger and working medium-thermal source heat exchanger all adopt the shell of pipe type vaporizer of open-shelf heat exchanger, submerged combustion vaporizer or band intermediate heat medium.
6. a kind of process system utilizing cold energy of liquefied natural gas to generate electricity as claimed in claim 1 or 2 or 3 or 4, it is characterized in that: described working medium-set up a working medium gas-liquid separator between thermal source heat exchanger and turbo-expander-generator set, between described turbo-expander-generator set and working medium separator, set up a working medium air and liquid mixer; The entrance of described working medium gas-liquid separator is connected with the outlet of described working medium-thermal source heat exchanger, first outlet of described working medium gas-liquid separator is connected with the entrance of described turbo-expander-generator set, second outlet of described working medium gas-liquid separator is connected with the first entrance of described working medium air and liquid mixer, described turbo-expander-generator set outlet is connected with the second entrance of described working medium air and liquid mixer, and the outlet of described working medium air and liquid mixer is connected with the entrance of described working medium separator.
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| CN201520036903.5U CN204552851U (en) | 2015-01-20 | 2015-01-20 | A kind of process system utilizing cold energy of liquefied natural gas to generate electricity |
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| CN201520036903.5U CN204552851U (en) | 2015-01-20 | 2015-01-20 | A kind of process system utilizing cold energy of liquefied natural gas to generate electricity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105863762A (en) * | 2015-01-20 | 2016-08-17 | 中国海洋石油总公司 | Process system for generating power by LNG cold energy and method thereof |
| CN106870937A (en) * | 2015-12-10 | 2017-06-20 | 中国石化工程建设有限公司 | LNG gasification and TRT and gasification and/or electricity-generating method based on IFV |
-
2015
- 2015-01-20 CN CN201520036903.5U patent/CN204552851U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105863762A (en) * | 2015-01-20 | 2016-08-17 | 中国海洋石油总公司 | Process system for generating power by LNG cold energy and method thereof |
| CN105863762B (en) * | 2015-01-20 | 2017-12-15 | 中国海洋石油总公司 | A kind of process system to be generated electricity using cold energy of liquefied natural gas and method |
| CN106870937A (en) * | 2015-12-10 | 2017-06-20 | 中国石化工程建设有限公司 | LNG gasification and TRT and gasification and/or electricity-generating method based on IFV |
| CN106870937B (en) * | 2015-12-10 | 2019-05-17 | 中国石化工程建设有限公司 | LNG gasification and power generator and gasification and/or electricity-generating method based on IFV |
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Granted publication date: 20150812 Effective date of abandoning: 20171215 |