CN103362579A - Two-stage expansion power generation device and method for recovering liquefied natural gas cold energy - Google Patents
Two-stage expansion power generation device and method for recovering liquefied natural gas cold energy Download PDFInfo
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Abstract
The invention relates to a two-stage expansion power generation device and method for recovering liquefied natural gas cold energy. LNG enters a first runner of a multi-stream cryogenic heat exchanger for vaporization and temperature rise after passing through an LNG pump for pressure rise; high-pressure working medium gas outputs electric power after entering a first-stage turbine expander for expansion, the working medium gas is divided into two parts, the first part enters a second runner of a plate-fin multi-stream cryogenic heat exchanger to absorb the LNG cold energy and become liquid through condensation, and then a pump is used for pressurization; the second part enters a second-stage turbine expander for expansion after passing through a second heat exchanger, enters a third runner of the plate-fin multi-stream cryogenic heat exchanger to become liquid through condensation, enters a fourth runner after being pressurized through the pump, converges with the first part of the working medium gas, conducts heat exchange with a refrigerant after the convergence, and then returns to an inlet of the first-stage turbine expander after conducting heat exchange with the environment and/or absorbing industrial waste heat to finish the circulation. Power output by the first-stage turbine expander and power output by the second-stage turbine expander are both used for generating the electric power. According to the two-stage expansion power generation device and method for recovering the liquefied natural gas cold energy, ethylene or ethane is used as the working medium, the LNG cold energy and the waste heat are recovered for power generation, and the two-stage expansion power generation device and method can be widely applied to power generation through utilization of the liquefied natural gas cold energy.
Description
Technical field
The present invention relates to a kind of electricity generating device and method, particularly about a kind of with ethene or ethane as working medium, can reclaim cold energy of liquefied natural gas or utilize the LNG cold energy and industrial exhaust heat produces double expansion electricity generating device and the method for electric power.
Background technique
LNG Liquefied natural gas (LNG) makes a kind of cleaning of rock gas being made it to be condensed into liquid at low temperatures and obtaining, efficient, the fossil energy that can utilize on a large scale.Although LNG is liquid when storing transportation, then needs when in use to be vaporizated into first gas, can discharge in this course a large amount of, high-quality low temperature cold, is not only caused waste may cause in addition " cold pollution " as not reclaiming.LNG cold energy use technology comprises LNG generating, air separation, freezer low-temperature receiver, desalination of sea water, lighter hydrocarbons separation, cold drying etc.The cold energy generation technology plays an important role as one of LNG cold energy use major way.The basic principle of utilizing the LNG cold energy generation is by a cryogenic power generation cycle process, and take LNG as low temperature cold source, the mechanical work of utilizing cryogenic power generation cycle to produce drives generator set and produces electric power.How obtaining higher cold energy use efficient is important technical problem, and prior art is various ways openly, is described as follows:
(1) as shown in Figure 1 a kind of LNG cold energy level Four recycling system, this system comprises LNG storage tank 101, compression pump 102, the first condenser 103, the first compressor 104, the first vaporizer 105, the first expansion turbine 106, the first generator set 107, the second condenser 108, the second compressor 109, the second vaporizer 110, the second turbine engine 111, the second generator set 112, the 3rd expansion turbine 113, the 3rd generator 114, heat exchanger 115, recycle pump 116 and ice storage tank 117.Wherein, the LNG vaporization intensification expansion major loop of LNG storage tank 101, compression pump 102, the first condenser 103, the second condenser 108, the 3rd expansion turbine 113 and heat exchanger 115 formations; The one-level Rankine cycle generator unit that the first condenser 103, the first compressor 104, the first vaporizer 105, the first expansion turbine 106 and the first generator set 107 consist of; The secondary Rankine cycle generator unit that the second condenser 108, the second compressor 109, the second vaporizer 110, the second turbine engine 111 and the second generator set 112 consist of; The expansion power generation unit that the 3rd expansion turbine 113 and the 3rd generator set 114 consist of; The low temperature ice storage cooling unit that is consisted of by heat exchanger 115, recycle pump 116 and ice storage tank 117.Although LNG cold energy level Four recycling system can improve the recovery utilization rate of LNG cold energy, system adopts the Rankine cycle of two-stage cascade formula to produce electric power, is in series by two separate low temperature Rankine cycles, and technological process is comparatively complicated.
(2) as shown in Figure 2 the temperature-difference power generation module that utilizes the LNG cold energy and preparation method thereof, in low temperature central air-conditioning system and freezer, it is infeasible directly utilizing the latent heat of LNG or sensible heat and air or water heat exchange, so cool storage medium reduces heat-exchange temperature in the middle of needing, and can adopt thermoelectric thermo-electric generation.Low temperature is installed in temperature-difference power generation module on the temperature difference pipeline of this system, between the import and export pipeline such as heat exchanger.This temperature-difference power generation module adopts full static heat electric material thermo-electric generation mode, has simple, movement-less part, conveniently carries out the advantage such as series and parallel connections combination.This technological scheme based on the diverse principle of power cycle, what adopt is thermoelectric thermo-electric generation technology, the problem such as but the thermoelectric cooling technology exists the cost height, electric power is little and thermoelectric conversion efficiency is low, successful application is only arranged in the power generating equipment of very little function, and this limits the application of this technological scheme in most LNG cold energy generation facilities.
(3) as shown in Figure 3 a kind of LNG cold energy step, integrated utilization system, this system comprises cold energy service company, freezer company, four parts of icerink and cooling water air conditioner control zone, can realize that the cold energy step utilizes fully.Cold energy service company control zone comprises LNG storage tank B1～B3, and the LNG storage tank is used for storing and providing LNG Liquefied natural gas; The butane heat exchanger is communicated with butane high temperature storage tank by normal temperature pumping pipeline and makes high temperature refrigerant butane cooling heat exchange; Three parts of butane low-temperature storage tank.Be connected with return line between heat exchanger and the butane high temperature storage tank.The Cryogenic exergy power generation part comprises the expansion power generation unit, is communicated with the butane heat exchanger circulation of butane heat exchange storage compartment by pipeline.LNG stores up tank connected two pipelines, and one connects gas distributing system through the air gasification pipeline, and another connects the expansion power generation unit through temperature pumping pipeline, butane heat exchanger, generates electricity.Freezer, snow dome and cooling water air conditioner company control zone comprise that internal exchanger group, coolant storage tank carry out the cold energy use of high temperature section.This technological scheme is a kind of step cold energy use scheme of LNG cold energy, only some is used for producing electric power to the LNG cold energy, this a part of electric power is as working medium take butane, utilize a butane Rankine cycle that the cold energy of LNG is converted into electric energy, the butane Rankine power cycle of single-stage is not high with the efficient that cold energy is converted into electric energy, this technological scheme has cold energy service company for LNG station periphery, freezer, ice rink, air-conditionings etc. are directly used awkward silence at a meeting institute, directly comparatively suitable with the larger situation of cold, but many LNG receiving stations periphery is without directly with cold demand or directly use cold demand lower, cold energy need to be converted into as far as possible the occasion of electric energy, this technological scheme efficient of this situation is not high.
(4) as shown in Figure 4, be applicable to the multistage recycling system of LNG cold energy of boats and ships, this system is applicable to the multistage system that utilizes of LNG cold energy of boats and ships, this system comprises: the LNG vaporization intensification expansion major loop that LNG storage tank, compression pump, the first condenser, the second condenser, First Heat Exchanger, the second heat exchanger and the 3rd expansion turbine consist of, and this major loop is connected with gas electricity generator on the boats and ships; The first order Rankine generator unit that is consisted of by the first condenser, the first compressor, the first vaporizer, the first expansion turbine and the first generator; The second level Rankine cycle generator unit that is consisted of by the second condenser, the second compressor, the second vaporizer, the second turbo-expander and the second generator; The low temperature cooling unit that is consisted of by First Heat Exchanger; The low temperature cooling unit that is consisted of by the second heat exchanger; The LNG that is made of the second heat exchanger, recycle pump and water heater heats the low-temperature heat supply unit; The expansion power generation unit that has the 3rd expansion turbine and the 3rd generator to consist of, what its power generation part adopted is the combining form of the Rankine cycle of two-stage cascade formula and rock gas expansion cycle, wherein Rankine cycle is to be in series by two separate low temperature Rankine cycles, technological process is comparatively complicated, equipment is many, and investment is large.
Summary of the invention
For the problems referred to above, the purpose of this invention is to provide a kind of ethene or ethane of can adopting is working medium, and can combine with LNG direct expansion flow process, also can utilize simultaneously cold energy of liquefied natural gas and industrial exhaust heat to produce double expansion electricity generating device and the method for the recovery cold energy of liquefied natural gas of electric power.
For achieving the above object, the present invention takes following technological scheme: a kind of double expansion electricity generating device that reclaims cold energy of liquefied natural gas is characterized in that: it comprises a LNG pump, a plate and fin type multiple flow cryogenic heat exchanger, first to fourth heat exchanger, first order turbo-expander, the first generator, second level turbo-expander, the second generator, the first working medium pump and the second working medium pump; One end of described LNG pump connects a LNG for the source of goods, the other end of described LNG pump is connected to the first flow ingress of described plate and fin type multiple flow cryogenic heat exchanger, the first flow outlet port of described plate and fin type multiple flow cryogenic heat exchanger connects the entrance of described First Heat Exchanger, and the outlet of described First Heat Exchanger is connected to multi-purpose station pipeline; Described first order turbo-expander output acting place connects the first generator, described first order turbo-expander outlet port is connected in parallel to the second flow passage entry of described plate and fin type multiple flow cryogenic heat exchanger and the entrance of described the second heat exchanger, the outlet of described the second heat exchanger is connected to the ingress of described second level turbo-expander, turbo-expander output acting place of the described second level connects described the second generator, the outlet of described second level turbo-expander is connected to the 3rd flow passage entry of described plate and fin type multiple flow cryogenic heat exchanger, the 3rd runner exit connects an end of described the first working medium pump, and the other end of described the first working medium pump is connected to the 4th flow passage entry of described plate and fin type multiple flow cryogenic heat exchanger; The second runner exit of described plate and fin type multiple flow cryogenic heat exchanger is connected to an end of described the second working medium pump, the 4th runner exit of the other end of described the second working medium pump and described plate and fin type multiple flow cryogenic heat exchanger is connected in parallel to the input end of described the 3rd heat exchanger, the output terminal of described the 3rd heat exchanger connects the input end of described the 4th heat exchanger, the output terminal of described the 4th heat exchanger connects the entrance that is back to described first order turbo-expander, finishes circulation.
Also comprise the 5th heat exchanger and Natural gas expander, the outlet of described First Heat Exchanger connects the entrance of described the 5th heat exchanger, and the outlet of described the 5th heat exchanger connects the entrance of described Natural gas expander, and the outlet of described Natural gas expander connects multi-purpose station pipeline.
Also comprise the 6th heat exchanger, the outlet of described the first turbo-expander is parallel-connected to the second flow passage entry of described plate and fin type multiple flow cryogenic heat exchanger and the entrance of described the 6th heat exchanger, and the outlet of described the 6th heat exchanger connects the entrance of described the second heat exchanger.
A kind of electricity-generating method of described electricity generating device, it may further comprise the steps: 1) a double expansion electricity generating device that comprises the recovery cold energy of liquefied natural gas of LNG pump, plate and fin type multiple flow cryogenic heat exchanger, first to fourth heat exchanger, first order turbo-expander, the first generator, second level turbo-expander, the second generator, the first working medium pump and the second working medium pump is set; 2) LNG be delivered to the first flow vaporization of plate and fin type multiple flow cryogenic heat exchanger after by LNG pump adherence pressure and heat up after enter in the First Heat Exchanger with the refrigerant heat exchange after output be used for air feed or outer defeated; High-pressure working medium gas enters and expands in the first order turbo-expander and cooling, the merit of first order turbo-expander output is used for driving the first generator and produces electric power, high-pressure working medium gas is divided into two-part after becoming middle pressure Working medium gas after by first order turbo-expander, press Working medium gas to enter the second runner of plate and fin type multiple flow cryogenic heat exchanger in the first portion, the cold energy that absorbs LNG through the second runner of plate and fin type multiple flow cryogenic heat exchanger is condensed into middle pressure worker quality liquid, and enters the second working medium pump adherence pressure; Press Working medium gas to enter the second heat exchanger in the second portion, entering second level turbo-expander after the second heat exchanger heat exchange expands, the merit of second level turbo-expander output is used for driving the second generator and produces electric power, the 3rd runner that low-pressure gas after second level turbo-expander expands enters plate and fin type multiple flow cryogenic heat exchanger is condensed into liquid, export after reclaiming cold by laggard the 4th runner that enters plate and fin type multiple flow cryogenic heat exchanger of the first working medium pump adherence pressure, and converge with middle pressure worker quality liquid through the second working medium pump output, liquid working substance after converging enters gets back to first order turbo-expander after the 3rd heat exchanger enters the 4th heat exchanger heat exchange again with the refrigerant heat exchange first, finishes circulation.
Also comprise the 5th heat exchanger and Natural gas expander, behind the LNG process LNG pump adherence pressure, enter first flow vaporization and the intensification of plate and fin type multiple flow cryogenic heat exchanger, LNG after heat exchange heat exchange in First Heat Exchanger, again by the 5th heat exchanger heat exchange, send into the rock gas turbo-expander after the heat exchange, and then output gasification rock gas is used for air feed.
Also comprise the 6th heat exchanger, high-pressure working medium gas becomes middle pressure Working medium gas after by first order turbo-expander, and wherein the second portion Working medium gas enters and enters the second heat exchanger behind the 6th heat exchanger again and carry out heat exchange.
Described high-pressure working medium gas adopts a kind of in ethene and the ethane.
In described the second heat exchanger, the 4th heat exchanger, the 5th heat exchanger and the 6th heat exchanger employing external environment and the industrial exhaust heat one or both carry out heat exchange.
The present invention is owing to take above technological scheme, it has the following advantages: cold during 1, LNG Liquefied natural gas can discharge in vaporescence, but this is an alternating temperature process, if employing single-stage expansion, then working medium can only absorb cold under a steady temperature, its heat transfer temperature difference can be larger, the present invention is owing to adopted the double expansion circulation of ethene or ethane, make working medium at two different temperature absorption colds, the heat transfer temperature difference of whole like this process is little, thereby reduced the exergy loss of heat transfer process, improved cold energy use efficient.2, the present invention is owing to also adopted the backheat circulation, also very low from the second working medium pump ethene or ethane Temperature of Working out, by heat recovery process the working medium of this a part of low temperature is got back to and recycle its cold energy in the multiple flow cryogenic heat exchanger, therefore can further promote the cold energy use efficient of LNG.3, the present invention is owing to only adopt a kind of working medium, and the one-level circulation is only arranged, thereby when energy utilization efficiency was high, flow process was relatively simple, equipment is less, cost is lower.4, the present invention also can adopt ethane as working medium owing to can adopt ethene as working medium, can select suitable working medium according to the engineering actual conditions, thereby have flexible advantage in the selection of working medium.5, the utilization of the cold energy of LNG is primary condition among the present invention, if there is not suitable industrial exhaust heat, can be directly with the thermal source of air as working medium heating vaporization, if suitable industrial exhaust heat is arranged, can be after the working medium vaporization, utilize industrial exhaust heat that working medium is further heated, promote its temperature, thereby make it in decompressor, export more merit, thereby produce more electric power, further promote the efficient of circulation, so the present invention can utilize cold energy and the industrial exhaust heat of LNG simultaneously, also can only utilize the cold energy of LNG, applicability is extensive.6, double expansion circulation of the present invention itself just can be used alone as the device that utilizes the LNG cold energy generation, can also be combined with LNG direct expansion circulation, has further promoted flexibility and applicability.In sum, because the present invention adopts hydrocarbon mixture as working medium, only have the one-level Rankine cycle, can obtain very high generating efficiency, have very high efficient and better flexibility, can be widely used in utilizing in the cold energy of liquefied natural gas generating.
Description of drawings
Fig. 1 is LNG level Four recycling system schematic representation in the prior art;
Fig. 2 is LNG cold energy use system flow schematic representation in the prior art;
Fig. 3 is LNG cold energy use overall principle flow chart in the prior art;
Fig. 4 is the multistage recycling system schematic representation of LNG cold energy that is applicable to boats and ships in the prior art;
Fig. 5 is the structural representation of the embodiment of the invention 1;
Fig. 6 is the structural representation of the embodiment of the invention 2;
Fig. 7 is the structural representation of the embodiment of the invention 3;
Fig. 8 is the structural representation of the embodiment of the invention 4;
Fig. 9 is the structural representation of the embodiment of the invention 5.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in detail
Embodiment 1:
As shown in Figure 5, the double expansion electricity generating device of recovery cold energy of liquefied natural gas of the present invention comprises a LNG pump 11, a plate and fin type multiple flow cryogenic heat exchanger 12, first to fourth heat exchanger 13～16, first order turbo-expander 17, the first generator 18, second level turbo-expander 19, the second generator 20, the first working medium pump 21 and the second working medium pump 22.
One end of LNG pump 11 connects LNG for source of goods (not shown), the other end of LNG pump 11 is connected to first flow (a) ingress of plate and fin type multiple flow cryogenic heat exchanger 12, first flow (a) outlet port of plate and fin type multiple flow cryogenic heat exchanger 12 connects the entrance of First Heat Exchanger 13, and the outlet of First Heat Exchanger 13 is connected to multi-purpose station pipeline NG.
17 output actings place of first order turbo-expander connect the first generator 18 and are used for generating, 17 outlets of first order turbo-expander are parallel-connected to the second runner (b) ingress of plate and fin type multiple flow cryogenic heat exchanger 12 and the entrance of the second heat exchanger 14, the outlet of the second heat exchanger 14 is connected to the ingress of second level turbo-expander 19, turbo-expander 19 output actings place in the second level connect the second generator 20 and are used for generating, the outlet of second level turbo-expander 19 is connected to the 3rd runner (c) ingress of plate and fin type multiple flow cryogenic heat exchanger 12, the 3rd runner (c) outlet connects an end of the first working medium pump 21, and the other end of the first working medium pump 21 is connected to the 4th runner (d) ingress of plate and fin type multiple flow cryogenic heat exchanger 12; The second runner (b) outlet of plate and fin type multiple flow cryogenic heat exchanger 12 is connected to an end of the second working medium pump 22, the 4th runner (d) outlet of the other end of the second working medium pump 22 and plate and fin type multiple flow cryogenic heat exchanger 12 is connected in parallel to the input end of the 3rd heat exchanger 15, the output terminal of the 3rd heat exchanger 15 connects the input end of the 4th heat exchanger 16, the output terminal of the 4th heat exchanger 16 connects the entrance that is back to first order turbo-expander 19, finishes circulation.
Electricity-generating method based on the double expansion electricity generating device of the recovery cold energy of liquefied natural gas of the invention described above is:
LNG be delivered to first flow (a) vaporization of plate and fin type multiple flow cryogenic heat exchanger 12 after by LNG pump 11 adherence pressures and heat up after enter in the First Heat Exchanger 13 with the refrigerant heat exchange after output be used for air feed or outer defeated, First Heat Exchanger 13 is used for promoting the temperature of the rock gas after LNG gasifies, with convenient outer defeated, utilize simultaneously this a part of cold of refrigerant recovering, this a part of cold can be used for the awkward silence at a meeting institute such as air-conditioning or freezer.
High-pressure working medium gas enters 17 interior expansion and the coolings of first order turbo-expander, and the merit of first order turbo-expander 17 outputs is used for driving the first generator 18 and produces electric power.High-pressure working medium gas becomes middle pressure Working medium gas and is divided into two-part after by first order turbo-expander 17, press Working medium gas to enter second runner (b) of plate and fin type multiple flow cryogenic heat exchanger 12 in the part, the cold energy that absorbs LNG through second runner (b) of plate and fin type multiple flow cryogenic heat exchanger 12 is condensed into middle pressure worker quality liquid, and enters the second working medium pump 22 adherence pressures.Press Working medium gas in the second portion after the second heat exchanger 14 and environment heat exchange, entering second level turbo-expander 19 expands, the merit of second level turbo-expander 19 outputs is used for driving the second generator and produces electric power, the 3rd runner (c) that low pressure working fluid gas after second level turbo-expander 19 expands enters plate and fin type multiple flow cryogenic heat exchanger 12 is condensed into liquid, export after reclaiming cold by laggard the 4th runner (d) that enters plate and fin type multiple flow cryogenic heat exchanger 12 of the first working medium pump 21 adherence pressures, and converge with middle pressure worker quality liquid through the output of the second working medium pump 22, liquid working substance after converging enters to enter after the 3rd heat exchanger 15 and the refrigerant heat exchange again and gets back to first order turbo-expander 19 after the 4th heat exchanger 16 and the surrounding environment heat exchange and finish circulation, and the cold that refrigerant obtains can be used for to the air-conditioning system cooling.
In above-described embodiment, the high-pressure that high-pressure working medium gas enters the ingress of first order turbo-expander 17 is 1500～3000kPa, be preferably 1700～2500kPa, the pressure of the middle pressure Working medium gas in first order turbo-expander 17 outlet ports is 600～1000kPa, be preferably 750～900kPa, the pressure of the low pressure working fluid gas of second level turbo-expander 19 outlets is 95～120kPa, is preferably 105～120kPa.
In the various embodiments described above, the temperature of the LNG Liquefied natural gas after First Heat Exchanger 13 heat exchange is-80 ℃～30 ℃, is preferably-60 ℃～-15 ℃; Entering the middle pressure Working medium gas temperature of cooling off in second runner (b) of plate and fin type multiple flow cryogenic heat exchanger 12 is-90 ℃～-30 ℃, be preferably-60 ℃～-35 ℃, press 10 ℃～20 ℃ of worker quality liquid temperature reductions in after plate and fin type multiple flow cryogenic heat exchanger 12 cooling; The low pressure working fluid gas temperature that enters the 3rd runner (c) of plate and fin type multiple flow cryogenic heat exchanger 12 is-110 ℃～-50 ℃, is preferably-90 ℃～-65 ℃, and after the cooling of the 3rd runner, cryogenic fluid gas is converted into liquid, and its temperature is-145 °～-65 °; The cryogenic fluid temperature that flows out through the 4th runner (d) of plate and fin type multiple flow cryogenic heat exchanger 12 is-80 ℃～-40 ℃, is preferably-65 ℃～-50 ℃; Working medium after converging is carried out heat exchange to-10 ℃～10 ℃ with refrigerant first, again through the 4th heat exchanger 16 and air heat-exchange to 40 ℃～130 ℃.
In the various embodiments described above, high-pressure working medium gas can adopt ethane or ethene according to actual needs.
Embodiment 2:
As shown in Figure 6, can whether there be suitable industrial exhaust heat to utilize according to the scene, the applicable industry waste heat energy improves generating efficiency under possible condition, the structure of present embodiment and embodiment's 1 structure is identical, and difference only is: working medium can be carried out heat exchange with industrial exhaust heat in that the 4th heat exchanger 16 is interior.Wherein, utilize industrial exhaust heat that working medium is heated to 40 ℃～90 ℃, be preferably 50 ℃～80 ℃.
Embodiment 3:
As shown in Figure 7, the structure of present embodiment and embodiment's 1 structure is basic identical, and difference is: also comprise the 5th heat exchanger 23 and Natural gas expander 24; The outlet of the First Heat Exchanger 13 among the embodiment 1 connects the entrance of the 5th heat exchanger 23, and the outlet of the 5th heat exchanger 23 connects the entrance of Natural gas expander 24, and the outlet of Natural gas expander 24 connects multi-purpose station pipeline NG.
LNG process LNG pump 11 adherence pressures are to 8MPa～15MPa, enter first flow vaporization and the intensification of plate and fin type multiple flow cryogenic heat exchanger 12, LNG elder generation after the heat exchange and refrigerant are in First Heat Exchanger 13 interior heat exchange, again by the 5th heat exchanger 23 and external environment heat exchange, send into rock gas turbo-expander 24 after the heat exchange, and then output gasification rock gas is used for air feed.
Embodiment 4:
As shown in Figure 8, can whether there be suitable industrial exhaust heat to utilize according to the scene, the applicable industry waste heat energy improves generating efficiency under possible condition, present embodiment and embodiment's 3 structure is identical, difference only is: can utilize industrial exhaust heat to heat the 4th heat exchanger 16 and the 5th heat exchanger 23, that is: enter in the first order turbo-expander 17 after utilizing industrial exhaust heat that the 4th heat exchanger 16 is heated; In addition, heating when utilizing industrial exhaust heat that LNG is passed through the 5th heat exchanger 23 is sent into Natural gas expander 24 and is used for air feed or fails pressure outward after the heating.Wherein, the industrial exhaust heat heating-up temperature is 60 ℃～70 ℃.
Embodiment 5:
As shown in Figure 9, present embodiment and embodiment's 4 structure is basic identical, difference only is: also comprise the 6th heat exchanger 25, the outlet of the first turbo-expander 17 is parallel-connected to the second runner (b) ingress of plate and fin type multiple flow cryogenic heat exchanger 12 and the entrance of the 6th heat exchanger 25, and the outlet of the 6th heat exchanger 25 connects the entrance of the second heat exchanger 14.Wherein, the 6th heat exchanger 25 can utilize industrial exhaust heat heating working medium gas, and its heating-up temperature is 60 ℃～70 ℃.
The various embodiments described above only are used for explanation the present invention, and wherein the structure of each parts and Placement etc. all can change to some extent, and every equivalents and improvement of carrying out on the basis of technical solution of the present invention all should do not got rid of outside protection scope of the present invention.
Claims (8)
1. double expansion electricity generating device that reclaims cold energy of liquefied natural gas, it is characterized in that: it comprises a LNG pump, a plate and fin type multiple flow cryogenic heat exchanger, first to fourth heat exchanger, first order turbo-expander, the first generator, second level turbo-expander, the second generator, the first working medium pump and the second working medium pump;
One end of described LNG pump connects a LNG for the source of goods, the other end of described LNG pump is connected to the first flow ingress of described plate and fin type multiple flow cryogenic heat exchanger, the first flow outlet port of described plate and fin type multiple flow cryogenic heat exchanger connects the entrance of described First Heat Exchanger, and the outlet of described First Heat Exchanger is connected to multi-purpose station pipeline;
Described first order turbo-expander output acting place connects the first generator, described first order turbo-expander outlet port is connected in parallel to the second flow passage entry of described plate and fin type multiple flow cryogenic heat exchanger and the entrance of described the second heat exchanger, the outlet of described the second heat exchanger is connected to the ingress of described second level turbo-expander, turbo-expander output acting place of the described second level connects described the second generator, the outlet of described second level turbo-expander is connected to the 3rd flow passage entry of described plate and fin type multiple flow cryogenic heat exchanger, the 3rd runner exit connects an end of described the first working medium pump, and the other end of described the first working medium pump is connected to the 4th flow passage entry of described plate and fin type multiple flow cryogenic heat exchanger; The second runner exit of described plate and fin type multiple flow cryogenic heat exchanger is connected to an end of described the second working medium pump, the 4th runner exit of the other end of described the second working medium pump and described plate and fin type multiple flow cryogenic heat exchanger is connected in parallel to the input end of described the 3rd heat exchanger, the output terminal of described the 3rd heat exchanger connects the input end of described the 4th heat exchanger, the output terminal of described the 4th heat exchanger connects the entrance that is back to described first order turbo-expander, finishes circulation.
2. a kind of double expansion electricity generating device that reclaims cold energy of liquefied natural gas as claimed in claim 1, it is characterized in that: also comprise the 5th heat exchanger and Natural gas expander, the outlet of described First Heat Exchanger connects the entrance of described the 5th heat exchanger, the outlet of described the 5th heat exchanger connects the entrance of described Natural gas expander, and the outlet of described Natural gas expander connects multi-purpose station pipeline.
3. a kind of double expansion electricity generating device that reclaims cold energy of liquefied natural gas as claimed in claim 2, it is characterized in that: also comprise the 6th heat exchanger, the outlet of described the first turbo-expander is parallel-connected to the second flow passage entry of described plate and fin type multiple flow cryogenic heat exchanger and the entrance of described the 6th heat exchanger, and the outlet of described the 6th heat exchanger connects the entrance of described the second heat exchanger.
4. electricity-generating method such as each described electricity generating device of claim 1～3, it may further comprise the steps:
1) a double expansion electricity generating device that comprises the recovery cold energy of liquefied natural gas of LNG pump, plate and fin type multiple flow cryogenic heat exchanger, first to fourth heat exchanger, first order turbo-expander, the first generator, second level turbo-expander, the second generator, the first working medium pump and the second working medium pump is set;
2) LNG be delivered to the first flow vaporization of plate and fin type multiple flow cryogenic heat exchanger after by LNG pump adherence pressure and heat up after enter in the First Heat Exchanger with the refrigerant heat exchange after output be used for air feed or outer defeated;
High-pressure working medium gas enters and expands in the first order turbo-expander and cooling, the merit of first order turbo-expander output is used for driving the first generator and produces electric power, high-pressure working medium gas is divided into two-part after becoming middle pressure Working medium gas after by first order turbo-expander, press Working medium gas to enter the second runner of plate and fin type multiple flow cryogenic heat exchanger in the first portion, the cold energy that absorbs LNG through the second runner of plate and fin type multiple flow cryogenic heat exchanger is condensed into middle pressure worker quality liquid, and enters the second working medium pump adherence pressure; Press Working medium gas to enter the second heat exchanger in the second portion, entering second level turbo-expander after the second heat exchanger heat exchange expands, the merit of second level turbo-expander output is used for driving the second generator and produces electric power, the 3rd runner that low-pressure gas after second level turbo-expander expands enters plate and fin type multiple flow cryogenic heat exchanger is condensed into liquid, export after reclaiming cold by laggard the 4th runner that enters plate and fin type multiple flow cryogenic heat exchanger of the first working medium pump adherence pressure, and converge with middle pressure worker quality liquid through the second working medium pump output, liquid working substance after converging enters gets back to first order turbo-expander after the 3rd heat exchanger enters the 4th heat exchanger heat exchange again with the refrigerant heat exchange first, finishes circulation.
5. a kind of double expansion electricity-generating method that reclaims cold energy of liquefied natural gas as claimed in claim 4, it is characterized in that: also comprise the 5th heat exchanger and Natural gas expander, behind the LNG process LNG pump adherence pressure, enter first flow vaporization and the intensification of plate and fin type multiple flow cryogenic heat exchanger, LNG after heat exchange heat exchange in First Heat Exchanger, by the 5th heat exchanger heat exchange, send into the rock gas turbo-expander after the heat exchange again, and then output gasification rock gas is used for air feed.
6. a kind of double expansion electricity-generating method that reclaims cold energy of liquefied natural gas as claimed in claim 5, it is characterized in that: also comprise the 6th heat exchanger, high-pressure working medium gas becomes middle pressure Working medium gas after by first order turbo-expander, and wherein the second portion Working medium gas enters and enters the second heat exchanger behind the 6th heat exchanger again and carry out heat exchange.
7. such as claim 4 or 5 or 6 described a kind of double expansion electricity-generating methods that reclaim cold energy of liquefied natural gas, it is characterized in that: described high-pressure working medium gas adopts a kind of in ethene and the ethane.
8. such as each described a kind of double expansion electricity-generating method that reclaims cold energy of liquefied natural gas of claim 4～7, it is characterized in that: one or both in described the second heat exchanger, the 4th heat exchanger, the 5th heat exchanger and the 6th heat exchanger employing external environment and the industrial exhaust heat carry out heat exchange.
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