CN106369273A - Fresh water temperature control system and method for utilizing main machine tail gas waste heat for gasification of LNG - Google Patents

Fresh water temperature control system and method for utilizing main machine tail gas waste heat for gasification of LNG Download PDF

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Publication number
CN106369273A
CN106369273A CN201610749944.8A CN201610749944A CN106369273A CN 106369273 A CN106369273 A CN 106369273A CN 201610749944 A CN201610749944 A CN 201610749944A CN 106369273 A CN106369273 A CN 106369273A
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China
Prior art keywords
pipeline
temperature
water temperature
lng
water
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Granted
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CN201610749944.8A
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CN106369273B (en
Inventor
郑卫刚
叶晨晖
张文帅
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/026—Special adaptations of indicating, measuring, or monitoring equipment having the temperature as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0119—Shape cylindrical with flat end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/03—Orientation
    • F17C2201/032—Orientation with substantially vertical main axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/056—Small (<1 m3)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0332—Safety valves or pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0335—Check-valves or non-return valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F17C2227/0316—Water heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0631—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention discloses a fresh water temperature control system and method for utilizing main machine tail gas waste heat for gasification of LNG. The system comprises a cold water pipeline, a hot water pipeline, a three-way valve, a water inlet pipeline, an LNG heater, a water outlet pipeline, a tail gas pipeline and a controller, wherein the three-way valve is driven by a motor. The cold water pipe is connected with the water outlet pipe and the three-way valve. The hot water pipeline is connected with the water outlet pipeline and the three-way valve. The hot water pipeline is provided with a tail gas heater and an electric heater. The water inlet pipeline is connected with the three-way valve and the LNG heater. The water inlet pipeline is provided with two fresh water pumps and a temperature sensor in a parallel connection manner. The LNG heater is connected with an LNG pipeline. The tail gas pipeline is connected with a main machine tail gas pipeline. The controller is connected with the electric heater, the motor, the two fresh water pumps and the temperature sensor. The high-temperature waste gas is used for heating the low-temperature fresh water, the high-temperature fresh water is then conveyed to the LNG gasification heater through the water pumps, and the LNG absorbs heat and is gasified. The fresh water temperature control system and method have the environment-friendly functions that energy saving and emission reduction are achieved, and waste heat of waste gas is sufficiently utilized.

Description

Fresh water temperature control system and method using main frame waste heat from tail gas gasification lng
Technical field
The present invention relates to a kind of lng gasification temperature control system is and in particular to a kind of utilize main frame waste heat from tail gas gasification lng Fresh water temperature control system and method.
Background technology
Develop rapidly with scientific and technical, and the raising to environmental protection requirement, research and development of lng ship and using in ship Oceangoing ship industry achieves huge progress.But when temperature is relatively low, the liquefaction lng under high pressure is difficult to be gasified totally, lead to itself and sky Gas mixes uneven and burns insufficient, so that oil consumption is increased.Especially in extremely frigid zones, when situation is serious, diesel engine even cannot Maintain and run well.Accordingly, it is considered to big to region span during ship's navigation, difference variation substantially, our lng's to be focused more on Gasification degree.And rationally control the temperature of lng, it is the key making liquid lng gasify.
For making lng fully gasify, generally adopt following three kinds of methods: 1, reduce pressure；2nd, add additive in lng； 3rd, electric heater or steam heating are utilized.First method is although can make lng fully gasify, but is easy to by temperature Impact, when range of temperature is larger, blood pressure lowering had both been insufficient to allow lng fully to gasify, on the contrary too low pressure be unfavorable for lng and Being sufficiently mixed of air.Second method is although the gasification degree of lng can be increased, but the additive adding can reduce lng institute Accounting example, leads to lng burning insufficient, simultaneously in the case that temperature is too low, adds additive to be still insufficient to allow lng fully gas Change.The third method although can be with the problem of effectively solving lng fully gasification, however it is necessary that consuming extra electric energy and coal, wave Take resource.
Content of the invention
Constantly the gasification of liquid lng to be made to cause using electric heater under sail to solve existing lng ship The problem of energy waste, the fresh water temperature control of lng it is an object of the invention to provide a kind of utilization main frame waste heat from tail gas gasifies System and method.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of fresh water temperature control system of utilization main frame waste heat from tail gas gasification lng, this system is arranged on for connecting lng The periphery of the lng pipeline of liquid containing bottle and gas mixing bottle, for being supplied to together with after so that it is mixed with air the gasification of liquid lng Main frame, described system include cold water pipeline, hot water line, by motor-driven three-way valve, inlet pipeline, lng heater, water outlet Pipeline, tail gas pipeline and controller；
One end of described cold water pipeline is connected with outlet pipeline, and its other end is connected with the first port of three-way valve；Described One end of hot water line is connected with outlet pipeline, and its other end is connected with the second port of three-way valve, and described hot water line sets It is equipped with heater exhaust gas and electric heater；One end of described inlet pipeline is connected with the 3rd port of three-way valve, its other end with The water inlet of lng heater connects, and described inlet pipeline has been installed in parallel the first fresh water pump and the second fresh water pump, described water inlet The exit of pipeline is provided with temperature sensor；The side of described lng heater is provided with water inlet and gas outlet, and its opposite side sets Have inlet and outlet, the outlet of described lng heater is connected with outlet pipeline, the inlet of described lng heater with Liquid lng pipeline connects, and the gas outlet of described lng heater is connected with gaseous state lng pipeline；One end of described tail gas pipeline connects Main frame tail gas pipeline, its other end is connected with the air inlet of heater exhaust gas, and the gas outlet of described heater exhaust gas connects one and gives up Gas discharge pipe；Described controller is respectively with electric heater, motor, the first fresh water pump, the second fresh water pump, temperature sensor even Connect；
Before host-initiated, controller is in positive maximum position by motor control three-way valve, that is, connection hot water line and Inlet pipeline, closing cold water pipeline and inlet pipeline, then control electric heater and the first fresh water pump work, controller is according to temperature Water temperature t0 in the inlet pipeline of degree sensor detection judges that can main frame start, if water temperature t0 reaches minimum work water temperature t1 When, host-initiated, main frame tail gas heats the water flowing through hot water pipeline together with electric heater, if water temperature t0 is higher than highest working water During warm t2, the aperture of regulating three-way valve is judged by the aperture size of three-way valve or closes electric heater, if water temperature t0 is less than Low work water temperature t1, starts the second fresh water pump.
By technique scheme, described lng heater and heater exhaust gas are plate type heat exchanger.
By technique scheme, described first fresh water pump, the second fresh water pump are the vertical list of irg type with suction capacity Level pipeline hot water centrifugal pump.
A kind of fresh water temperature-controlled process based on said system, comprises the following steps:
S1, system are opened, and controller initializes, and controller is in positive maximum position by motor control three-way valve；
S2, controller control the first fresh water pump and electric heater operation setup time t1, and are detected according to temperature sensor Inlet pipeline in water temperature t0 judge that can main frame start, if water temperature t0 reaches minimum work water temperature t1 in setting time t1 When, then export the ready signal of main frame fuel system, start main frame；
After s3, main frame run setting time t2, temperature sensor detection water temperature t0:
If s301 water temperature t0 is higher than highest alarm temperature t4, controller sends alarm signal, and sends hostdown and stop Car signal；
If s302 water temperature t0 is higher than maximum operating temperature t2, controller detects whether the positive aperture of three-way valve is more than 50%；
If the positive aperture of three-way valve is less than 50%, whether detection electric heater works, if electric heater work, closes Close electric heater, if electric heater does not work, detect whether the second fresh water pump works, if the second fresh water pump work, close Second fresh water pump, if the second fresh water pump does not work, sends system alarm signal, sends warning；
If the positive aperture of three-way valve is more than 50%, three-way valve is reversely opened big 10%, that is, cold water pipeline of performing fighting, runs After setting time t3, detect water temperature t0, if being higher than maximum operating temperature t2, repeat step s3；
If s303 water temperature t0 is located between minimum work water temperature t1 and highest work water temperature t2, system is in dynamically puts down Weighing apparatus state；
If s304 water temperature t0 is less than minimum work water temperature t1, the whether positive aperture of detection three-way valve is threaded to maximum, if not It is threaded to maximum, then three-way valve is rotated forward 10%, run setting time t3, if three-way valve has been threaded to positive maximum, carry out Step s305；
If it is higher than to set minimum limit temperature t3 that s305 water temperature t0 is less than minimum work water temperature t1, controller controls the Two fresh water pump works, after the second fresh water pump operation setting time t4, temperature sensor detects water temperature t0；
If water temperature t0 is higher than maximum operating temperature t2, repeat step s3；
If water temperature t0 is located between minimum work water temperature t1 and highest work water temperature t2, system is in dynamic equilibrium shape State；
If water temperature t0 is still less than minimum work water temperature t1 higher than setting minimum limit temperature t3, controller controls electricity Heater works, if water temperature t0 is higher than minimum work water temperature t1 in setting time t4, carries out step s3, otherwise sends water temperature Low-temperature warning；
If s306 water temperature t0 is less than minimum limit temperature t3, send water temperature low-temperature warning.
The present invention, has the advantages that the present invention makes full use of main frame waste heat from tail gas and combines electric heater to low temperature Fresh water is heated, and the high temperature fresh water after heating and liquid lng carry out heat exchange and be vaporized, and the low temperature fresh water after heat exchange is capable of circulation Use, there are energy-saving and emission-reduction, make full use of the environment-friendly function of waste gas residual heat.The present invention is also by controller and temperature sensor pair Water temperature carries out ratio and understands a point setting control, both can automatically control it is also possible to switch to Non-follow control, energy-saving effect is obvious, example As when 100% flow, power is 50kw；When 75%-85% flow, power is 22kw；When 40%-60% flow, work( Rate is 4kw, and after having level to adjust, the temperature rise of fresh water pump substantially reduces, and decreases mechanical wear and maintenance work.The present invention is also Controller can be communicated with host computer, be easy to full ship power device centralized Control and supervision.
Brief description
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of lng bifuel system in the present invention；
Fig. 2 is the schematic diagram of fresh water temperature control system in the present invention；
Fig. 3 is the flow chart of fresh water temperature-controlled process in the present invention.
In Fig. 1: 1-lng liquid containing bottle, 2- gas stop valve, 3- fresh water temperature control system, 4- stop valve, 5-lng temperature Sensor, 6- gas pressure reducer, 7- cooling gas check valve, 8- pressure transducer, 9-lng pipeline, 10- gas mixing bottle, 11- master Machine；
In Fig. 2: 301- first fresh water pump, 302- temperature sensor, 303- second fresh water pump, 304- three-way valve, 305- electricity Machine, 306- tail gas pipeline, 307- outlet pipeline, 308- cold water pipeline, 309- hot water line, 310- inlet pipeline, 311- electricity add Hot device, 312- heater exhaust gas, 313-lng heater, 314- controller, 316- waste gas discharge pipeline, 901- liquid lng pipe Road, 902- gaseous state lng pipeline.
Specific embodiment
In order that the object of the invention, technical scheme and advantage become more apparent, below in conjunction with drawings and Examples, to this Invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and without In the restriction present invention.
As shown in figure 1, lng bifuel system includes lng liquid containing bottle 1, the gas mixing being sequentially connected by lng pipeline 9 Bottle 10 and main frame 11, lng pipeline 9 are located at and are disposed with gas between lng liquid containing bottle 1 and gas mixing bottle 10 from left to right Stop valve 2, lng temperature sensor 5, pressure transducer 8, gas pressure reducer 6, cooling gas check valve 7, gas pressure reducer 6 and pressure Sensor 8, lng pipeline 9 is located at and is disposed with gas stop valve 2 He between gas mixing bottle 10 and main frame 11 from left to right Pressure transducer 8.Lng pipeline 9 includes the liquid lng pipeline 901 shown in Fig. 2 and gaseous state lng pipeline 902.Lng temperature sensing Device, pressure transducer are used for the temperature and pressure of the gaseous state lng through lng heater for the measurement and are shown in panel.Gas subtracts Pressure valve is used for reducing lng gas, and lng gas pressure is controlled in setting value.Cooling gas check valve is used for avoiding gases at high pressure to flow back. Gas mixing bottle is used for mixing lng gas and air, is easy to burn.
Shown in Fig. 1, a kind of fresh water temperature control system of utilization main frame waste heat from tail gas gasification lng, this fresh water temperature control System 3 is arranged on the periphery for connecting lng liquid containing bottle 1 and the lng pipeline 9 of gas mixing bottle 10, for liquid lng gasifies It is supplied to main frame 11 together with after so that it is mixed with air, the inlet pipeline of fresh water temperature control system is provided with stop valve 4, such as Shown in Fig. 2, fresh water temperature control system 3 includes cold water pipeline 308, hot water line 309, the three-way valve being driven by motor 305 304th, inlet pipeline 310, lng heater 313, outlet pipeline 307, tail gas pipeline 306 and controller 314；
One end of cold water pipeline 308 is connected with outlet pipeline 307, and its other end is connected with the first port of three-way valve 304； One end of hot water line 309 is connected with outlet pipeline 307, and its other end is connected with the second port of three-way valve 304, hot water line It is provided with heater exhaust gas 312 and electric heater 311 on 309；One end of inlet pipeline 310 and the 3rd port of three-way valve 304 Connect, its other end is connected with the water inlet of lng heater 313, and inlet pipeline 310 has been installed in parallel the first fresh water pump 301 With the second fresh water pump 303, the exit of inlet pipeline 310 is provided with temperature sensor 302；The side of lng heater 313 is provided with Water inlet and gas outlet, its opposite side is provided with inlet and outlet, and the outlet of lng heater 313 is with outlet pipeline 307 even Connect, the inlet of lng heater 313 is connected with liquid lng pipeline 901, the gas outlet of lng heater 313 and gaseous state lng pipeline 902 connections；One end of tail gas pipeline 306 connects main frame tail gas pipeline, and its other end is connected with the air inlet of heater exhaust gas 312 Connect, the gas outlet of heater exhaust gas 312 connects a waste gas discharge pipeline 316；Controller 314 respectively with electric heater 311, motor 305th, the first fresh water pump 301, the second fresh water pump 303, temperature sensor 302 connect；
Before main frame 11 starts, controller 314 controls three-way valve 304 to be in positive maximum position by motor 305, that is, connect Hot water line 309 and inlet pipeline 310, close cold water pipeline 308 and inlet pipeline 310, then control electric heater 311 and the One fresh water pump 301 works, and water temperature t0 in inlet pipeline 310 that controller 314 detects according to temperature sensor 302 judges main frame Can 11 start, if water temperature t0 reaches minimum work water temperature t1, main frame 11 starts, and main frame tail gas heats together with electric heater Flow through the water of hot water pipeline, if water temperature t0 is higher than highest work water temperature t2, regulation three is judged by the aperture size of three-way valve The aperture of port valve or closing electric heater, if water temperature t0 is less than minimum work water temperature t1, start the second fresh water pump.
In a preferred embodiment of the invention, as shown in Fig. 2 lng heater 313 and heater exhaust gas 312 be board-like Heat exchanger.Lng plate type heat exchanger is bb zl series Denier plate type heat exchanger, and each plate has two kinds of different moire angles Degree, can obtain six kinds of runner combinations, make selected model obtain best match between heat transfer property, pressure drop and economy.Tail Gas plate type heat exchanger, each plate has two kinds of different ripple angles, can obtain six kinds of runner combinations, so that selected model is being passed Best match is obtained between hot property, pressure drop and economy.Lng heater and heater exhaust gas are all with plate type heat exchanger Form, through row heat exchange, at the beginning of diesel engine starting, when delivery temperature is not enough, enables electric heater and carries out auxiliary heating so that lng Can completely vaporize, and lng conveyance conduit is under high pressure conditions all the time.The plate type heat exchanger adopting in the present embodiment can be selected for Parallel plate type heat exchanger, due to the special shape of template, the runner direction between plate and section constantly change, and fluid is logical Forming strong disturbance in road, so that thermal boundary layer is constantly destroyed, thus being effectively reduced thermal resistance, improving heat transfer coefficient.
In a preferred embodiment of the invention, as shown in Fig. 2 the first fresh water pump, the second fresh water pump is has from energy-absorbing The irg type vertical single stage pipeline hot water centrifugal pump of power.The controlled device of two fresh water pumps automatically controls, during underload only with one light Water pump provides fresh water to lng heater, still can not meet load when the aperture of load increase and three-way valve is large enough to During requirement, then it is incorporated to another fresh water pump with enlargement discharge.Now two fresh water pumps just can be reached with 50% load respectively The burden requirement of the maximum fresh-water flow (100%) of cooling system.From hydrodynamics, the cube of shaft power p and rotating speed n It is directly proportional, therefore, work as discharge reduction, when pump rotary speed declines, power will reduce a lot, therefore can reach obvious energy-saving effect.
In a preferred embodiment of the invention, as shown in Fig. 2 temperature sensor is pt00, belong to thermal resistance type temperature and pass Sensor.This sensor is to be increased with the rising of temperature using metal material resistance value, is installed among fresh water pipeline. The detecting element of pt100 sensor is inserted directly in fresh water, without housing protection, to avoid the air between thermal resistance and housing Impact heat transfer rate.Escape for medium when preventing from changing or overhauling sensor, employ special spring capsule structure, and this biography The thermal inertia very little of sensor, can experience the change of temperature immediately.
In a preferred embodiment of the invention, as shown in Fig. 2 controller is engard controller, this controller adopts 8032 single-chip microcomputers, have the Automatic Control function of PI Controller, by the electric circuit board of printing, solid-state relay, electricity Source filter, transformator and connecting terminal block etc. form, and printed circuit board (PCB) have 8 differential process devices, memorizer and input defeated Go out excuse.Controller carries out proportional integral (pi) setting control to fresh water temperature, both can automatically control, converted if necessary Can be with Non-follow control.Controller controls servomotor action to change the aperture of three-way valve according to temperature signal.Engard controls Utensil has the advantage that energy-saving effect substantially, such as, when 100% flow, power is 50kw；When 75%-85% flow, work( Rate is 22kw；When 40%-60% flow, power is 4kw；After having level to adjust, pump motor temperature rise is decreased obviously, simultaneously Decrease mechanical wear and maintenance work；Defencive function is reliable, eliminates motor because what overload or single-phase operation caused and burns out motor Phenomenon；There is the functions such as perfect self-inspection, control, display, various faults warning, improve the reliability of system.Fresh water pump It is controlled by the relevant parameter of controller with three-way valve, there is very strong adaptability and motility.
In a preferred embodiment of the invention, as shown in Fig. 2 three-way valve is zdlq (x) electronic type electric T-shaped valve, electronic Three-way control valve is made up of with three-way control valve 3810l series electronic formula actuator.Include to raise and take function, accept unified 4- The standard signal of 20ma or i-5v dc, current signal is transformed into corresponding straight-line displacement, and automatically control and regulation valve is opened Degree, reaches the temperature to fluids within pipes.The motor of three-way valve is automatically controlled by controller, and when load increases, engard is controlled Unit automatic control motor processed starts to reduce the aperture of three-way control valve and to reduce bypass amount, flows through tail gas such that it is able to increase The fresh-water flow of heater.
In a preferred embodiment of the invention, as shown in Fig. 2 electric heater adds for ddr u f (50) -380/80-ex electricity Hot device, tubular electric heating, heat tube shape, version: flange connects, flange latus rectum is 50mm, rated voltage is 380v, Rated power is the anti-explosion electric heater of 80kw.Electric heater only can enable in both cases, and one is just to have started diesel engine When, delivery temperature is not enough, for making lng fully vaporize, should enable electrical heating heating fresh water；Two is to lead to 30 minutes load is excessive When interior fresh water temperature is unable to reach design temperature all the time, enable electric heater.
In the present invention, fresh water can recycle.Lng heater makes it fully gasify using fresh water heating liquid lng.Electricity Heater was used in the starting stage of host-initiated, when tail gas heat quantity is not enough, carried out auxiliary heating.Temperature sensor is located at The import of lng heater, enters the fresh water temperature of lng heater for detection.Motor is used for changing the aperture of three-way valve, controls Flow through the flow of the fresh water of heater exhaust gas.Heater exhaust gas are used for the heat transfer of tail gas to fresh water, the waste gas after heat exchange Discharge through waste gas discharge pipeline.
A kind of fresh water temperature-controlled process based on said system, comprises the following steps:
S1, system are opened, and controller initializes, and controller is in positive maximum position by motor control three-way valve, tool Body, controller detection judges whether three-way valve is in positive maximum position (note: positive maximum as three-way valve hot water line opens To maximum, cold water pipeline closing), it is opened into positive maximum if not then controlling three-way valve；
S2, controller control timer to start timing, control the first fresh water pump and electric heater operation setup time t1, and Water temperature t0 in inlet pipeline according to temperature sensor detection judges that can main frame start, if water temperature t0 is in setting time t1 When reaching minimum work water temperature t1, then export the ready signal of main frame fuel system, start main frame, if in setting time t1 Not up to set water temperature, then send electric heater fault alarm；
When s3, host-initiated, controller exports timer timing signal t2, delay adjustmentses time t2, and main frame runs and sets After time t2, temperature sensor detection water temperature t0:
If s301 water temperature t0 is higher than highest alarm temperature t4, controller sends alarm signal, and sends hostdown and stop Car signal；
If s302 water temperature t0 is higher than maximum operating temperature t2, controller detects whether the positive aperture of three-way valve is more than 50%；
If the positive aperture of three-way valve is less than 50%, whether detection electric heater works, if electric heater work, defeated Go out electric heater shutdown signal, close electric heater, if electric heater does not work, detect whether the second fresh water pump works, if Second fresh water pump work, then export the second fresh water pump shutdown signal, closes the second fresh water pump, if the second fresh water pump does not work, Send system alarm signal, send warning；
If the positive aperture of three-way valve is more than 50%, by three-way valve, reversely (note: cold water pipeline of reversely performing fighting) is opened greatly 10%, that is, cold water pipeline of performing fighting, controller output starts timer timing signal t3, after running setting time t3, detects water temperature T0, if being higher than maximum operating temperature t2, repeat step s3；
If s303 water temperature t0 is located between minimum work water temperature t1 and highest work water temperature t2, that is, during t2 t0 t1, then System is in dynamic balance state, and temperature sensor keeps water temperature detection, and enters information into controller；
If s304 water temperature t0 is less than minimum work water temperature t1, the whether positive aperture of detection three-way valve is threaded to maximum, if not It is threaded to maximum, then three-way valve is rotated forward 10%, controller starts timer, time delay t3, runs setting time t3, if threeway Valve has been threaded to positive maximum, then carry out step s305；
If it is higher than to set minimum limit temperature t3, i.e. t1 > t0 t3, then that s305 water temperature t0 is less than minimum work water temperature t1 Controller output the second fresh water pump working signal, the second fresh water pump work, the timer operation of controller control simultaneously, time delay t4, After second fresh water pump operation setting time t4, temperature sensor detects water temperature t0；
If water temperature t0 is higher than maximum operating temperature t2, i.e. t0 > t2, then repeat step s3；
If water temperature t0 is located between minimum work water temperature t1 and highest work water temperature t2, i.e. t2 t0 t1, then at system In dynamic balance state；
If water temperature t0 is still less than minimum work water temperature t1 higher than setting minimum limit temperature t3, meter opened by controller When device, set restriction time t4, control electric heater work, if water temperature t0 in setting time t4 be higher than minimum work water temperature T1, then carry out step s3, otherwise send water temperature low-temperature warning；
If s306 water temperature t0 is less than minimum limit temperature t3, send water temperature low-temperature warning.
It should be appreciated that for those of ordinary skills, can be improved according to the above description or be converted, And all these modifications and variations all should belong to the protection domain of claims of the present invention.

Claims (4)

1. a kind of fresh water temperature control system of utilization main frame waste heat from tail gas gasification lng, this system is arranged on for connecting lng storage The periphery of the lng pipeline of liquid bottle and gas mixing bottle, for being supplied to master together with after so that it is mixed with air the gasification of liquid lng Machine is it is characterised in that described system includes cold water pipeline, hot water line, added by motor-driven three-way valve, inlet pipeline, lng Hot device, outlet pipeline, tail gas pipeline and controller；
One end of described cold water pipeline is connected with outlet pipeline, and its other end is connected with the first port of three-way valve；Described hot water One end of pipeline is connected with outlet pipeline, and its other end is connected with the second port of three-way valve, and described hot water line is provided with Heater exhaust gas and electric heater；One end of described inlet pipeline is connected with the 3rd port of three-way valve, and its other end and lng add The water inlet of hot device connects, and described inlet pipeline has been installed in parallel the first fresh water pump and the second fresh water pump, described inlet pipeline Exit temperature sensor is installed；The side of described lng heater is provided with water inlet and gas outlet, its opposite side be provided with into Liquid mouth and outlet, the outlet of described lng heater is connected with outlet pipeline, the inlet of described lng heater and liquid Lng pipeline connects, and the gas outlet of described lng heater is connected with gaseous state lng pipeline；One end of described tail gas pipeline connects main frame Tail gas pipeline, its other end is connected with the air inlet of heater exhaust gas, and the gas outlet of described heater exhaust gas connects a waste gas row Put pipeline；Described controller is connected with electric heater, motor, the first fresh water pump, the second fresh water pump, temperature sensor respectively；
Before host-initiated, controller is in positive maximum position by motor control three-way valve, i.e. connection hot water line and water inlet Pipeline, closing cold water pipeline and inlet pipeline, then control electric heater and the first fresh water pump work, and controller passes according to temperature Water temperature t0 in the inlet pipeline of sensor detection judges that can main frame start, if water temperature t0 reaches minimum work water temperature t1, main Machine starts, and main frame tail gas heats the water flowing through hot water pipeline together with electric heater, if water temperature t0 is higher than highest work water temperature t2 When, the aperture of regulating three-way valve is judged by the aperture size of three-way valve or closes electric heater, if water temperature t0 is less than minimum work Make water temperature t1, start the second fresh water pump.
2. system according to claim 1 is it is characterised in that described lng heater and heater exhaust gas are board-like changing Hot device.
3. system according to claim 1 has oneself it is characterised in that described first fresh water pump, the second fresh water pump are The irg type vertical single stage pipeline hot water centrifugal pump of energy-absorbing power.
4. a kind of fresh water temperature-controlled process of system described in claim based on any of the above is it is characterised in that include following Step:
S1, system are opened, and controller initializes, and controller is in positive maximum position by motor control three-way valve；
S2, controller control the first fresh water pump and electric heater operation setup time t1, and entering according to temperature sensor detection Water temperature t0 in water lines judges that can main frame start, if water temperature t0 reaches minimum work water temperature t1 in setting time t1, Then export the ready signal of main frame fuel system, start main frame；
After s3, main frame run setting time t2, temperature sensor detection water temperature t0:
If s301 water temperature t0 is higher than highest alarm temperature t4, controller sends alarm signal, and sends hostdown parking letter Number；
If s302 water temperature t0 is higher than maximum operating temperature t2, controller detects whether the positive aperture of three-way valve is more than 50%；
If the positive aperture of three-way valve is less than 50%, whether detection electric heater works, if electric heater work, closes electricity Heater, if electric heater does not work, detects whether the second fresh water pump works, if the second fresh water pump work, closes second Fresh water pump, if the second fresh water pump does not work, sends system alarm signal, sends warning；
If the positive aperture of three-way valve is more than 50%, three-way valve is reversely opened big 10%, that is, cold water pipeline of performing fighting, runs and sets After time t3, detect water temperature t0, if being higher than maximum operating temperature t2, repeat step s3；
If s303 water temperature t0 is located between minimum work water temperature t1 and highest work water temperature t2, system is in dynamic equilibrium shape State；
If s304 water temperature t0 is less than minimum work water temperature t1, the whether positive aperture of detection three-way valve is threaded to maximum, if not being threaded to Maximum, then rotate forward 10% by three-way valve, runs setting time t3, if three-way valve has been threaded to positive maximum, carries out step s305；
If it is higher than to set minimum limit temperature t3 that s305 water temperature t0 is less than minimum work water temperature t1, controller control second is light Pump working, after the second fresh water pump operation setting time t4, temperature sensor detects water temperature t0；
If water temperature t0 is higher than maximum operating temperature t2, repeat step s3；
If water temperature t0 is located between minimum work water temperature t1 and highest work water temperature t2, system is in dynamic balance state；
If water temperature t0 is still less than minimum work water temperature t1 higher than setting minimum limit temperature t3, controller controls electrical heating Device works, if water temperature t0 is higher than minimum work water temperature t1 in setting time t4, carries out step s3, otherwise sends water temperature low temperature Report to the police；
If s306 water temperature t0 is less than minimum limit temperature t3, send water temperature low-temperature warning.
CN201610749944.8A 2016-08-27 2016-08-27 Utilize the fresh water temperature control system and method for host waste heat from tail gas gasification LNG Expired - Fee Related CN106369273B (en)

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Publication number Priority date Publication date Assignee Title
CN107804448A (en) * 2017-12-13 2018-03-16 泰兴市汇辰过滤器制造有限公司 A kind of Ship production fresh-water tank warm-keeping device

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JPS5718421A (en) * 1980-07-07 1982-01-30 Chiyoda Chem Eng & Constr Co Ltd High efficiency stable control device of rankine cycle utilizing cold heat source of liquid gas
CN2502228Y (en) * 2001-08-24 2002-07-24 广州市达德技术发展有限公司 Hot water energy-saving device using waste heat automatic controlled by computer
CN103899440A (en) * 2014-03-11 2014-07-02 哈尔滨工程大学 Ship gas/dual fuel engine LNG gasifying system based on exhaust energy recycling and control method thereof
CN103953457A (en) * 2014-03-21 2014-07-30 哈尔滨工程大学 Multi-stage crossed heat exchange device of MDO (Marine Diesel Oil)-LNG (Liquefied Natural Gas) dual-fuel engine

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Publication number Priority date Publication date Assignee Title
JPS5669421A (en) * 1979-11-07 1981-06-10 Kawasaki Heavy Ind Ltd Enclosed cycle type gas turbine employing coldness of liquefied natural gas
JPS5718421A (en) * 1980-07-07 1982-01-30 Chiyoda Chem Eng & Constr Co Ltd High efficiency stable control device of rankine cycle utilizing cold heat source of liquid gas
CN2502228Y (en) * 2001-08-24 2002-07-24 广州市达德技术发展有限公司 Hot water energy-saving device using waste heat automatic controlled by computer
CN103899440A (en) * 2014-03-11 2014-07-02 哈尔滨工程大学 Ship gas/dual fuel engine LNG gasifying system based on exhaust energy recycling and control method thereof
CN103953457A (en) * 2014-03-21 2014-07-30 哈尔滨工程大学 Multi-stage crossed heat exchange device of MDO (Marine Diesel Oil)-LNG (Liquefied Natural Gas) dual-fuel engine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107804448A (en) * 2017-12-13 2018-03-16 泰兴市汇辰过滤器制造有限公司 A kind of Ship production fresh-water tank warm-keeping device

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