CN105275506A - Cold energy and waste heat comprehensive utilization system for liquefied natural gas (LNG) transport ship - Google Patents
Cold energy and waste heat comprehensive utilization system for liquefied natural gas (LNG) transport ship Download PDFInfo
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- CN105275506A CN105275506A CN201510760017.1A CN201510760017A CN105275506A CN 105275506 A CN105275506 A CN 105275506A CN 201510760017 A CN201510760017 A CN 201510760017A CN 105275506 A CN105275506 A CN 105275506A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to a cold energy and waste heat comprehensive utilization system for a liquefied natural gas (LNG) transport ship. The cold energy and waste heat comprehensive utilization system comprises a high-pressure pump, a first heat exchanger, a second heat exchanger, a third heat exchanger, a first expansion work unit and a second expansion work unit. The first heat exchanger and the second heat exchanger are sequentially connected with an outlet pipeline of the high-pressure pump. The first expansion work unit and the second expansion work unit are connected with an outlet pipeline of the second heat exchanger in parallel. According to the cold energy and waste heat comprehensive utilization system, LNG cold energy, turbine waste steam and boiler exhaust smoke waste heat are used for vaporizing liquid-state LNG to drive an expansion turbine motor to work, and a fan on a boiler is directly driven, so that not only are the LNG cold energy, the turbine waste steam and the boiler exhaust smoke waste heat used fully and comprehensively, but also a large amount of electric energy is saved. Therefore the operating cost of the ship is reduced, and the cold energy and waste heat comprehensive utilization system has very good economic efficiency and environment-friendly performance.
Description
Technical field
Patent of the present invention relates to field of energy utilization, is specifically related to a kind of LNG cargo ship cold energy and used heat utilization system.
Background technique
LNG is the abbreviation of English LNG Liquefied natural gas (liquefiednaturalgas).Rock gas is a kind of clean, efficient energy by taking methane as main component, rock gas meets world energy sources strategy development requirement, the a lot of LNG receiving station of current many nation-building, the LNG ships that transport about 500 of whole world operation, nearly 10 of the Large LNG cargo ship that domestic Shipping Company has, the number more than 10 of lease offshore company LNG cargo ship, along with the increase of natural gas demand, the LNG cargo ship of coming 10 years operation will reach about 50-70.LNG cargo ship has advantageous advantage in the energy ezpenditure using LNG fuel as cabin power plant.
The new anti-pollution convention of International Maritime Organization (IMO) is to SO
xand NO
xemission request Deng waste gas is more and more higher, compares the CO that price is unstable and its burning and exhausting is a large amount of of fuel oil
2and SO
xetc. harmful matter, the LNG market price is stable and lower, and the harmful matter such as sulfur-bearing, dust hardly after burning, the CO of discharge
2and NO
xless, above-mentioned advantage and the new demand of pact impel more LNG cargo ships mainly to use or even use LNG as fuel completely.
The fuel of LNG cargo ship mainly contains fuel oil and LNG two kinds.The power plant in current 70%LNG cargo ship cabin are steam power plants.In steam power plant, by 2 boiler burning fuel oil or LNG, then 2 boiler develops steam vapor common pushing turbine carrys out carrying screws, make boats and ships constantly advance.2 blower fans are wherein needed constantly to blow for the O required for burning to burner hearth in every platform boiler operatiopn
2, every Fans peak output is 185KW, and therefore, blower fan is one of capital equipment of cabin power consumption.
Be the boil-off gas (BOG) of LNG cargo ship utilization in the generation of transportation process middle hold and the operative liquid LNG of forced vaporization of fuel completely with LNG, because the power (for steam power plant) of LNG cargo ship is comparatively large, need every day to consume nearly 300m
3lNG (according to liquid volume computing), the about m more than 100 BOG every day that cargo hold produces
3(folding synthesizing liquid volume), therefore also needs vaporization 150 ~ 170m
3-163 DEG C of liquid LNG, need a large amount of Boiler Steam heat so burning needs that the liquid LNG of forced vaporization meets boiler, not only consume the thermal source of a large amount of Boiler Steam, but also waste a large amount of cold energy of LNG in this vaporescence.
Summary of the invention
The object of this invention is to provide a kind of LNG cargo ship cold energy and used heat utilization system.This system utilizes LNG cold energy, exhaust steam in steam turbine and boiler exhaust gas waste heat, vaporize liquid LNG promotes the blower fan on expansion turbine acting Direct driver boiler, so not only utilize LNG cold energy, exhaust steam in steam turbine and boiler exhaust gas waste heat, also save a large amount of electric energy, thus saved the operation cost of boats and ships, there is good Economy and the feature of environmental protection.
For achieving the above object, technological scheme of the present invention is as follows.
A kind of LNG cargo ship cold energy and used heat utilization system, comprise high-pressure service pump, First Heat Exchanger, the second heat exchanger, the 3rd heat exchanger, the first expansion work unit and the second expansion work unit; First Heat Exchanger and the second heat exchanger are connected in turn on the outlet line of high-pressure service pump, and the first expansion work unit and the second expansion work unit are connected on the outlet line of the second heat exchanger side by side; Described first expansion work unit comprises the first expansion turbine, first stud gear case, first clutch, the first blower fan, second clutch, the second blower fan, the first frequency variator, the first threephase asynchronous machine, the second threephase asynchronous machine, the 3rd blower fan, and the first blower fan, the second blower fan, the 3rd blower fan are connected on first clutch, second clutch, the second threephase asynchronous machine; First clutch and second clutch are arranged on the output terminal of first stud gear case, and the first expansion turbine and the first threephase asynchronous machine are arranged on the input end of first stud gear case; Described second expansion work unit comprises the second expansion turbine, second stud gear case, the 3rd clutch, four fan device, four clutches, tendencies machine, the second frequency variator, the 3rd threephase asynchronous machine, the 4th threephase asynchronous machine, the 6th blower fan; Four fan device, tendencies machine, the 6th blower fan are connected on the 3rd clutch, four clutches, the 4th threephase asynchronous machine; 3rd clutch and four clutches are arranged on the output terminal of second stud gear case, and the second expansion turbine and the 3rd threephase asynchronous machine are arranged on the input end of second stud gear case; First expansion turbine, the second expansion turbine are all connected between the second heat exchanger and the 3rd heat exchanger.
Further, First Heat Exchanger outlet is connected with condenser.
Further, first clutch, second clutch are separately positioned on the first blower fan, between the second blower fan and first stud gear case.
Further, the 3rd clutch, four clutches are separately positioned on four fan device, between tendencies machine and second stud gear case.
First blower fan, second blower fan, the fan blades corner of the 3rd blower fan can regulate, thus change air output, when the first blower fan, when the fan blades corner of the second blower fan changes, first blower fan, second blower fan load can change, when load increases, the output shaft rotating speed of first stud gear case declines, first frequency variator is compared with the value of feedback of feedback signal by setting value, thus change frequency controls the first threephase asynchronous machine loading, rotating speed is improved with this, meet the requirements of rotating speed 1780rpm, when load reduces, the control of the first frequency variator is then contrary, meet the requirements of rotating speed equally.
Four fan device, tendencies machine, the fan blades corner of the 6th blower fan can regulate, thus change air output, when four fan device, when the fan blades corner of tendencies machine changes, four fan device, tendencies machine load can change, when load increases, the output shaft rotating speed of second stud gear case declines, second frequency variator is compared with the value of feedback of feedback signal by setting value, thus change frequency controls the 3rd threephase asynchronous machine loading, rotating speed is improved with this, meet the requirements of rotating speed 1780rpm, when load reduces, the control of the second frequency variator is then contrary, meet the requirements of rotating speed equally.
In described LNG cargo ship cold energy and used heat utilization system, the liquid LNG coming from boats and ships cargo tank is pressurized to about 30MPa by high-pressure service pump, enter First Heat Exchanger, in First Heat Exchanger, the LNG (temperature of LNG is-163 DEG C) of cryogenic high pressure and the exhaust steam in steam turbine of the 3rd heat exchanger heat exchange carry out heat exchange again, make cryogenic high pressure LNG become the rock gas of gaseous state.
In described LNG cargo ship cold energy and used heat utilization system, from First Heat Exchanger gaseous natural gas out in the second heat exchanger with the smoke discharging residual heat of boiler (during normal duty, exhaust gas temperature 160 DEG C) carry out heat exchange, become the rock gas (temperature is greatly about 130 DEG C about-150 DEG C) of high temperature.
In described a kind of LNG cargo ship cold energy and used heat utilization system, enter the first expansion turbine, the second expansion turbine acting respectively from the rock gas (temperature is greatly about 130 DEG C about-150 DEG C) of the second heat exchanger high temperature out, and drive two export the first blower fan, second blower fan of same rotational speed and drive two four fan device, tendencies machines exporting same rotational speed by second stud gear case respectively by first stud gear case.
In described first expansion work unit, first blower fan, between the second blower fan and first stud gear case, be respectively equipped with first clutch, second clutch, when any one blower fan damages wherein, first stud gear case can be departed to ensure that it keeps in repair, not affect other fan operation.
In described first expansion work unit, the first frequency variator can control the first threephase asynchronous machine, to meet the constant rotational speed demand of the first blower fan and the second blower fan respectively by the speed feedback signal change frequency of the first blower fan and the second blower fan.When the first expansion turbine acting cannot meet the workload demand of the first blower fan and the second blower fan, the first frequency variator carrys out the load needs of satisfied first blower fan and the second blower fan by the load changing the first threephase asynchronous machine.Under special circumstances, when the first blower fan or the second blower fan are thrown off with first clutch or second clutch respectively because of fault, first expansion turbine is likely greater than the load of the first blower fan or the second blower fan, now the first threephase asynchronous machine is negative torque, thus the first threephase asynchronous machine becomes generator to the power supply of network of ship feedback.Ensure in any case, the mechanical work of the first expansion turbine can be made full use of.
In the second described expansion work unit, four fan device, between tendencies machine and second stud gear case, be respectively equipped with the 3rd clutch, four clutches, can wherein any one blower fan damage time, second stud gear case can be departed to ensure that it keeps in repair, not affect other fan operation.
In the second described expansion work unit, the second frequency variator can control the 3rd threephase asynchronous machine, to meet the constant rotational speed demand of four fan device and tendencies machine respectively by the speed feedback signal change frequency of four fan device and tendencies machine.When the second expansion turbine acting cannot meet the workload demand of four fan device and tendencies machine, the second frequency variator carrys out the load needs of satisfied four fan device and tendencies machine by the load changing the second threephase asynchronous machine.Under special circumstances, when four fan device or tendencies machine are thrown off because of fault difference the 3rd clutch or four clutches, second expansion turbine is likely greater than the load of four fan device or tendencies machine, now the 3rd threephase asynchronous machine is negative torque, thus the 3rd threephase asynchronous machine becomes generator to the power supply of network of ship feedback.Ensure in any case, the mechanical work of the second expansion turbine can be made full use of.
In described a kind of LNG cargo ship cold energy and used heat utilization system, the gaseous natural gas (pressure of rock gas is 0.1MPa) of the low-temp low-pressure transported respectively from the first expansion work unit, the second expansion work unit the 3rd heat exchanger with exhaust steam in steam turbine heat exchange, with meet enter boiler before temperature at least the requirement of about 25 DEG C.
The present invention has following beneficial effect: the present invention not only saves the high-temperature steam of boiler required for forced vaporization LNG in traditional scheme, and makes full use of the used heat of LNG cold energy, boiler exhaust gas waste heat and exhaust steam in steam turbine.Expansion turbine acting Direct driver blower fan, compares expansion turbine acting and generates electricity and adopt motoring blower fan, decrease Conversion of Energy loss link, improve system effectiveness.Be provided with clutch between blower fan and speed-change gear box, can wherein any one blower fan damage time, speed-change gear box can be departed to ensure that it keeps in repair, not affect other fan operation, ensure that the reliability of system.First expansion work unit and the second expansion work unit are respectively equipped with frequency variator, and frequency variator regulates the rotating speed of threephase asynchronous machine to ensure the stabilization of speed of blower fan by the speed feedback of blower fan.Under special circumstances (during a certain blower fan throw-out-of clutch), if when the power of expansion turbine is greater than the power of blower fan, now threephase asynchronous machine (M1 or M3) is negative torque, threephase asynchronous machine (M1 or M3) becomes generator to the power supply of network of ship feedback, thus guarantee system under any circumstance can utilize decompressor turbine to do work to greatest extent.This system utilizes LNG cold energy, exhaust steam in steam turbine and boiler exhaust gas waste heat, vaporize liquid LNG promotes the blower fan on expansion turbine acting Direct driver boiler, not only achieve the abundant comprehensive utilization of LNG cold energy, exhaust steam in steam turbine and boiler exhaust gas waste heat, also save a large amount of electric energy, thus save the operation cost of boats and ships, there is good Economy and the feature of environmental protection.
Accompanying drawing explanation
Fig. 1 is the modular structure schematic diagram of a kind of LNG cargo ship cold energy provided by the invention and used heat utilization system.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described, better to understand the present invention.
In view of the LNG cargo ship employing steam power plant promotion boats and ships advance of about 70% of the current whole world, the boats and ships of class power plant are that invention design object is described further according to this.
As shown in Figure 1, what the embodiment of the present invention provided be applicable to a kind of LNG cargo ship cold energy and used heat utilization system comprises high-pressure service pump P, First Heat Exchanger H1, the second heat exchanger H2, the 3rd heat exchanger H3, the first expansion work unit and the second expansion work unit.First Heat Exchanger H1 and the second heat exchanger H2 is connected in turn on the outlet line of high-pressure service pump P, and the first expansion work unit and the second expansion work unit are connected on the outlet line of the second heat exchanger H2 side by side; Described first expansion work unit comprises the first expansion turbine E1, first stud gear case G1, first clutch C1, the first blower fan A1, second clutch C2, the second blower fan A2, the first frequency variator F1, the first threephase asynchronous machine M1, the second threephase asynchronous machine M2, the 3rd blower fan A3, and the first blower fan A1, the second blower fan A2, the 3rd blower fan A3 are connected on first clutch C1, second clutch C2, the second threephase asynchronous machine M2; First clutch C1 and second clutch C2 is arranged on first stud gear case G1 output terminal, and the first expansion turbine E1 and the first threephase asynchronous machine M1 is arranged on first stud gear case G1 input end; The second described expansion work unit comprises the second expansion turbine E2, second stud gear case G2, the 3rd clutch C3, four fan device A4, four clutches C4, tendencies machine A5, the second frequency variator F2, the 3rd threephase asynchronous machine M3, the 4th threephase asynchronous machine M4, the 6th blower fan A6; Four fan device A4, tendencies machine A5, the 6th blower fan A6 are connected on the 3rd clutch C3, four clutches C4, the 4th threephase asynchronous machine M4; 3rd clutch C3 and four clutches C4 is arranged on the output terminal of second stud gear case G2, and the second expansion turbine E2 and the 3rd threephase asynchronous machine M3 is arranged on the input end of second stud gear case G2; First expansion turbine E1, the second expansion turbine E2 are all connected between the second heat exchanger H2 and the 3rd heat exchanger H3.First Heat Exchanger H1 outlet is connected with condenser.First clutch C1, second clutch C2 are separately positioned on the first blower fan A1, between the second blower fan A2 and first stud gear case G1.3rd clutch C3, four clutches C4 are separately positioned between four fan device A4, tendencies machine A5 and second stud gear case G2.
First expansion turbine E1 and the first threephase asynchronous machine M1 provides power for first stud gear case G1; Second expansion turbine E2 and the 3rd threephase asynchronous machine M3 provides power for second stud gear case G2.
First blower fan A1, second blower fan A2, the fan blades corner of the 3rd blower fan A3 can regulate, thus change air output, as the first blower fan A1, when the fan blades corner of the second blower fan A2 changes, first blower fan A1, second blower fan A2 load can change, when load increases, the output shaft rotating speed of first stud gear case G1 declines, first frequency variator F1 is compared with the value of feedback of feedback signal by setting value, thus change frequency and control the first threephase asynchronous machine M1 and load, rotating speed is improved with this, meet the requirements of rotating speed (1780rpm), when load reduces, the control of the first frequency variator F1 is then contrary, meet the requirements of rotating speed equally.
Four fan device A4, tendencies machine A5, the fan blades corner of the 6th blower fan A6 can regulate, thus change air output, as four fan device A4, when the fan blades corner of tendencies machine A5 changes, four fan device A4, tendencies machine A5 load can change, when load increases, the output shaft rotating speed of second stud gear case G2 declines, second frequency variator F2 is compared with the value of feedback of feedback signal by setting value, thus change frequency and control the 3rd threephase asynchronous machine M3 and load, rotating speed is improved with this, meet the requirements of rotating speed (1780rpm), when load reduces, the control of the second frequency variator F2 is then contrary, meet the requirements of rotating speed equally.
In described LNG cargo ship cold energy and used heat utilization system, the liquid LNG coming from boats and ships cargo tank is pressurized to about 30MPa by high-pressure service pump P, enter First Heat Exchanger H1, in First Heat Exchanger H1, the LNG (temperature of LNG is-163 DEG C) of cryogenic high pressure and the exhaust steam in steam turbine of the 3rd heat exchanger H3 heat exchange carry out heat exchange again, make cryogenic high pressure LNG become the rock gas of gaseous state.
In described LNG cargo ship cold energy and used heat utilization system, from First Heat Exchanger H1 gaseous natural gas out among the second heat exchanger H2 with the smoke discharging residual heat of boiler (during normal duty, exhaust gas temperature 160 DEG C) heat exchange in the second heat exchanger, become the rock gas (temperature is greatly about 130 DEG C about-150 DEG C) of high temperature.
In described a kind of LNG cargo ship cold energy and used heat utilization system, enter the first expansion turbine E1, the second expansion turbine E2 acting respectively from the rock gas (temperature is greatly about 130 DEG C about-150 DEG C) of the second heat exchanger H2 high temperature out, and drive the first blower fan A1, the second blower fan A2 of two output same rotational speed and second stud gear case G2 to drive two four fan device A4, tendencies machine A5 exporting same rotational speed respectively by first stud gear case G1.
In the first described expansion work unit, first blower fan A1, between the second blower fan A2 and first stud gear case G1, be respectively equipped with first clutch C1, second clutch C2, can wherein any one blower fan damage time, first stud gear case G1 can be departed to ensure that it keeps in repair, not affect other fan operation.
In the first described expansion work unit, first frequency variator F1 can change frequency respectively by the speed feedback signal of the first blower fan A1 and the second blower fan A2 and control the first threephase asynchronous machine M1, to meet the constant rotational speed demand of the first blower fan A1 and the second blower fan A2.When the first expansion turbine E1 acting cannot meet the workload demand of the first blower fan A1 and the second blower fan A2, the first frequency variator F1 carrys out the load needs of full first blower fan A1 and the second blower fan A2 by the load changing the first threephase asynchronous machine M1.Under special circumstances, when the first blower fan A1 or the second blower fan A2 throws off because of fault difference first clutch C1 or second clutch C2, first expansion turbine E1 is likely greater than the load of the first blower fan A1 or the second blower fan A2, now the first threephase asynchronous machine M1 is negative torque, thus become generator to the power supply of network of ship feedback, ensure in any case, the mechanical work of the first expansion turbine E1 can be made full use of.
In the second described expansion work unit, the 3rd clutch C3, four clutches C4 is respectively equipped with between four fan device A4, tendencies machine A5 and second stud gear case G2, can wherein any one blower fan damage time, second stud gear case G2 can be departed to ensure that it keeps in repair, not affect other fan operation.
In the second described expansion work unit, second frequency variator F2 can change frequency respectively by the speed feedback signal of four fan device A4 and tendencies machine A5 and control the 3rd threephase asynchronous machine M3, to meet the constant rotational speed demand of four fan device A4 and tendencies machine A5.When the second expansion turbine E2 acting cannot meet the workload demand of four fan device A4 and tendencies machine A5, the second frequency variator F2 carrys out the load needs of full four fan device A4 and tendencies machine A5 by the load changing the second threephase asynchronous machine M2.Under special circumstances, when four fan device A4 or tendencies machine A5 throws off because of fault difference the 3rd clutch C3 or four clutches C4, second expansion turbine E2 is likely greater than the load of four fan device A4 or tendencies machine A5, now the 3rd threephase asynchronous machine M3 is negative torque, thus become generator to the power supply of network of ship feedback, ensure in any case, the mechanical work of the second expansion turbine E2 can be made full use of.
In described a kind of LNG cargo ship cold energy and used heat utilization system, the gaseous natural gas (pressure of rock gas is 0.1MPa) of the low-temp low-pressure transported respectively from the first expansion work unit, the second expansion work unit among the 3rd heat exchanger H3 with exhaust steam in steam turbine heat exchange, with meet enter boiler before temperature at least the requirement of about 25 DEG C.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (7)
1. a LNG cargo ship cold energy and used heat utilization system, it is characterized in that: comprise high-pressure service pump, First Heat Exchanger, the second heat exchanger, the 3rd heat exchanger, the first expansion work unit, the second expansion work unit, First Heat Exchanger and the second heat exchanger are connected in turn on the outlet line of high-pressure service pump, and the first expansion work unit and the second expansion work unit are connected on the outlet line of the second heat exchanger side by side; Described first expansion work unit comprises the first expansion turbine, first stud gear case, first clutch, the first blower fan, second clutch, the second blower fan, the first frequency variator, the first threephase asynchronous machine, the second threephase asynchronous machine, the 3rd blower fan, and the first blower fan, the second blower fan, the 3rd blower fan are connected on first clutch, second clutch, the second threephase asynchronous machine; First clutch and second clutch are arranged on the output terminal of first stud gear case, and the first expansion turbine and the first threephase asynchronous machine are arranged on the input end of first stud gear case; Described second expansion work unit comprises the second expansion turbine, second stud gear case, the 3rd clutch, four fan device, four clutches, tendencies machine, the second frequency variator, the 3rd threephase asynchronous machine, the 4th threephase asynchronous machine, the 6th blower fan; Four fan device, tendencies machine, the 6th blower fan are connected on the 3rd clutch, four clutches, the 4th threephase asynchronous machine; 3rd clutch and four clutches are arranged on the output terminal of second stud gear case, and the second expansion turbine and the 3rd threephase asynchronous machine are arranged on the input end of second stud gear case; First expansion turbine, the second expansion turbine are all connected between the second heat exchanger and the 3rd heat exchanger; First Heat Exchanger outlet is connected with condenser; First clutch, second clutch are separately positioned on the first blower fan, between the second blower fan and first stud gear case; 3rd clutch, four clutches are separately positioned on four fan device, between tendencies machine and second stud gear case.
2. LNG cargo ship cold energy according to claim 1 and used heat utilization system, it is characterized in that: described first blower fan, second blower fan, the fan blades corner of the 3rd blower fan can regulate, thus change air output, when the first blower fan, when the fan blades corner of the second blower fan changes, first blower fan, second blower fan load can change, when load increases, the output shaft rotating speed of first stud gear case declines, first frequency variator is compared with the value of feedback of feedback signal by setting value, thus change frequency controls the first threephase asynchronous machine loading, rotating speed is improved with this, meet the requirements of rotating speed 1780rpm, when load reduces, the control of the first frequency variator is then contrary, meet the requirements of rotating speed equally, four fan device, tendencies machine, the fan blades corner of the 6th blower fan can regulate, thus change air output, when four fan device, when the fan blades corner of tendencies machine changes, four fan device, tendencies machine load can change, when load increases, the output shaft rotating speed of second stud gear case declines, second frequency variator is compared with the value of feedback of feedback signal by setting value, thus change frequency controls the 3rd threephase asynchronous machine loading, rotating speed is improved with this, meet the requirements of rotating speed 1780rpm, when load reduces, the control of the second frequency variator F2 is then contrary, meet the requirements of rotating speed equally.
3. LNG cargo ship cold energy according to claim 1 and used heat utilization system, it is characterized in that: in described system, the liquid LNG coming from boats and ships cargo tank is pressurized to 30MPa by high-pressure service pump, enter First Heat Exchanger, in First Heat Exchanger, the LNG of cryogenic high pressure and the exhaust steam in steam turbine of the 3rd heat exchanger heat exchange carry out heat exchange again, make cryogenic high pressure LNG become the rock gas of gaseous state.
4. LNG cargo ship cold energy according to claim 1 and used heat utilization system, it is characterized in that: in described system, from First Heat Exchanger gaseous natural gas out in the second heat exchanger with the smoke discharging residual heat heat exchange in the second heat exchanger of boiler, become the rock gas of high temperature.
5. LNG cargo ship cold energy according to claim 1 and used heat utilization system, it is characterized in that: in described system, enter the first expansion turbine, the second expansion turbine acting respectively from the rock gas of the second heat exchanger high temperature out, and drive two four fan device, tendencies machines exporting same rotational speed respectively by the first blower fan, the second blower fan and the second stud gear case that first stud gear case drives two to export same rotational speed.
6. LNG cargo ship cold energy according to claim 1 and used heat utilization system, it is characterized in that: in described first expansion work unit, first frequency variator controls the first threephase asynchronous machine, to meet the constant rotational speed demand of the first blower fan and the second blower fan respectively by the speed feedback signal change frequency rice of the first blower fan and the second blower fan; When the first expansion turbine acting cannot meet the workload demand of the first blower fan and the second blower fan, the first frequency variator carrys out the load needs of full first blower fan and the second blower fan by the load changing the first threephase asynchronous machine; Under special circumstances, when the first blower fan or the second blower fan are thrown off because of fault difference first clutch or second clutch, first expansion turbine is greater than the load of the first blower fan or the second blower fan, and now the first threephase asynchronous machine is negative torque, thus becomes generator to the power supply of network of ship feedback; In described second expansion work unit, the second frequency variator controls the 3rd threephase asynchronous machine, to meet the constant rotational speed demand of four fan device and tendencies machine respectively by the speed feedback signal change frequency of four fan device and tendencies machine; When the second expansion turbine acting cannot meet the workload demand of four fan device and tendencies machine, the second frequency variator carrys out the load needs of full four fan device and tendencies machine by the load changing the second threephase asynchronous machine; Under special circumstances, when four fan device or tendencies machine are thrown off because of fault difference the 3rd clutch or four clutches, second expansion turbine is greater than the load of four fan device or tendencies machine, and now the 3rd threephase asynchronous machine is negative torque, thus becomes generator to the power supply of network of ship feedback.
7. LNG cargo ship cold energy according to claim 1 and used heat utilization system, it is characterized in that: in described system, the gaseous natural gas of the low-temp low-pressure transported respectively from the first expansion work unit, the second expansion work unit the 3rd heat exchanger with exhaust steam in steam turbine heat exchange, enter temperature before boiler to the requirement of step at about 25 DEG C to meet.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370599A (en) * | 2021-12-20 | 2022-04-19 | 深圳市燃气集团股份有限公司 | Pre-cooling BOG re-condensation system of LNG receiving station |
| CN114593612A (en) * | 2022-01-26 | 2022-06-07 | 何荣志 | High-efficient recovery system of stove low temperature waste heat |
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|---|---|---|---|---|
| JPS54152713A (en) * | 1978-05-23 | 1979-12-01 | Mazda Motor Corp | Engine exhaust gas flowing-back device |
| JPH09151707A (en) * | 1995-11-30 | 1997-06-10 | Osaka Gas Co Ltd | Cryogenic power generating device using liquid natural gas |
-
2015
- 2015-11-10 CN CN201510760017.1A patent/CN105275506B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54152713A (en) * | 1978-05-23 | 1979-12-01 | Mazda Motor Corp | Engine exhaust gas flowing-back device |
| JPH09151707A (en) * | 1995-11-30 | 1997-06-10 | Osaka Gas Co Ltd | Cryogenic power generating device using liquid natural gas |
Non-Patent Citations (1)
| Title |
|---|
| 胡选哲等: "LNG 动力船冷能发电系统的模拟优化研究", 《船舶工程》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370599A (en) * | 2021-12-20 | 2022-04-19 | 深圳市燃气集团股份有限公司 | Pre-cooling BOG re-condensation system of LNG receiving station |
| CN114370599B (en) * | 2021-12-20 | 2024-03-22 | 深圳市燃气集团股份有限公司 | LNG receiving station precooling type BOG recondensing system |
| CN114593612A (en) * | 2022-01-26 | 2022-06-07 | 何荣志 | High-efficient recovery system of stove low temperature waste heat |
| CN114593612B (en) * | 2022-01-26 | 2024-01-23 | 何荣志 | High-efficient recovery system of kiln low temperature waste heat |
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| Publication number | Publication date |
|---|---|
| CN105275506B (en) | 2017-09-19 |
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