CN106369273B - Utilize the fresh water temperature control system and method for host waste heat from tail gas gasification LNG - Google Patents

Utilize the fresh water temperature control system and method for host waste heat from tail gas gasification LNG Download PDF

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Publication number
CN106369273B
CN106369273B CN201610749944.8A CN201610749944A CN106369273B CN 106369273 B CN106369273 B CN 106369273B CN 201610749944 A CN201610749944 A CN 201610749944A CN 106369273 B CN106369273 B CN 106369273B
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temperature
pipeline
lng
water temperature
water
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CN106369273A (en
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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 kind of fresh water temperature control systems and method using host waste heat from tail gas gasification LNG, and system includes cold water pipeline, hot water line, the triple valve being driven by motor, inlet pipeline, LNG heater, outlet pipeline, tail gas pipeline and controller；Cold water pipe is connect with outlet pipe, triple valve；Hot water line connect with outlet pipeline, triple valve, and heater exhaust gas and electric heater are provided on hot water line；Inlet pipeline is connect with triple valve, LNG heater, is installed in parallel on inlet pipeline there are two fresh water pump and temperature sensor；LNG heater is connect with LNG piping connection；Tail gas pipeline and host tail gas piping connection；Controller is connect with electric heater, motor, two fresh water pumps, temperature sensors respectively.The present invention heats low temperature fresh water using high-temp waste gas, then high temperature fresh water is transported to LNG gasification heater by water pump, makes LNG endothermic gasification, has energy-saving and emission-reduction, makes full use of the environment-friendly function of waste gas residual heat.

Description

Utilize the fresh water temperature control system and method for host waste heat from tail gas gasification LNG
Technical field
The present invention relates to a kind of LNG gasification temperature control systems, and in particular to a kind of to utilize host waste heat from tail gas gasification LNG Fresh water temperature control system and method.
Background technique
With the rapid development of science and technology, and the raising to environmental protection requirement, the research and development and use of LNG ship oceangoing ship are in ship Oceangoing ship industry achieves huge progress.But when temperature is lower, the liquefaction LNG under high pressure is difficult to be gasified totally, and leads to itself and sky Gas mixing is uneven and burns insufficient, increases oil consumption.Especially in extremely frigid zones, when situation is serious, diesel engine even can not It maintains to run well.Accordingly, it is considered to big to region span when ship's navigation, difference variation is obvious, we will focus more on LNG's Gasification degree.And the temperature of LNG is rationally controlled, it is the key that make liquid LNG gasification.
To make LNG sufficiently gasify, generallys use following three kinds of methods: 1, reducing pressure；2, additive is added into LNG； 3, it is heated using electric heater or steam.First method is easy to although LNG can be made sufficiently to gasify by temperature Influence, when range of temperature is larger, decompression both LNG was insufficient to allow sufficiently to gasify, instead too low pressure be unfavorable for LNG and Air is sufficiently mixed.Second method, although can increase the gasification degree of LNG, the additive being added can reduce LNG institute Accounting example causes LNG burning insufficient, while in the case where temperature is too low, additive is added and is still insufficient to allow LNG sufficiently gas Change.The third method needs to consume additional electric energy and coal although can effectively solve the problems, such as that LNG sufficiently gasifies, wave Take resource.
Summary of the invention
In order to solve existing LNG ship oceangoing ship constantly using electric heater to make liquid LNG gasification under sail and caused by The problem of energy waste, the purpose of the present invention is to provide a kind of fresh water temperature controls using host waste heat from tail gas gasification LNG System and method.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of fresh water temperature control system using host waste heat from tail gas gasification LNG, system setting is for connecting LNG The periphery of the LNG pipeline of liquid storage bottle and gas mixing bottle, for being supplied to together after mixing with air it liquid LNG gasification Host, the system comprises cold water pipeline, hot water line, the triple valve being driven by motor, inlet pipeline, LNG heater, water outlets Pipeline, tail gas pipeline and controller；
One end of the cold water pipeline is connect with outlet pipeline, the first port connection of the other end and triple valve；It is described One end of hot water line is connect with outlet pipeline, the second port connection of the other end and triple valve, is set on the hot water line It is equipped with heater exhaust gas and electric heater；The third port of one end of the inlet pipeline and triple valve connects, the other end with The water inlet of LNG heater connects, and has been installed in parallel the first fresh water pump and the second fresh water pump, the water inlet on the inlet pipeline The exit of pipeline is equipped with temperature sensor；The side of the LNG heater is equipped with water inlet and gas outlet, and the other side is set Have inlet and water outlet, the water outlet of the LNG heater is connect with outlet pipeline, the inlet of the LNG heater with Liquid LNG piping connection, the gas outlet of the LNG heater and gaseous state LNG piping connection；One end of the tail gas pipeline connects The air inlet of host tail gas pipeline, the other end and heater exhaust gas connects, and the gas outlet connection one of the heater exhaust gas is useless Gas discharge pipe；The controller connects with electric heater, motor, the first fresh water pump, the second fresh water pump, temperature sensor respectively It connects；
Before host-initiated, controller is in positive maximum position by motor control triple valve, i.e., connection hot water line and Inlet pipeline closes cold water pipeline and inlet pipeline, then controls electric heater and the first fresh water pump work, controller is according to temperature Water temperature T 0 in the inlet pipeline of degree sensor detection judges that can host start, if water temperature T 0 reaches minimum work water temperature T1 When, host-initiated, host tail gas and electric heater heat the water for flowing through hot water pipeline together, if water temperature T 0 is higher than highest working water When warm T2, the aperture of regulating three-way valve is judged by the opening size of triple valve or closes electric heater, if water temperature T 0 is lower than most Low work water temperature T1 starts the second fresh water pump.
According to the above technical scheme, the LNG heater and heater exhaust gas are plate heat exchanger.
According to the above technical scheme, first fresh water pump, the second fresh water pump are the vertical list of IRG type with suction capacity Grade pipeline hot water centrifugal pump.
A kind of fresh water temprature control method based on above system, comprising the following steps:
S1, system are opened, and controller initialization, controller is in positive maximum position by motor control triple 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 T 0 judge that can host start, if water temperature T 0 reaches minimum work water temperature T1 in setting time t1 When, then the ready signal of host fuel system is exported, host is started；
After S3, host operation setting time t2, temperature sensor detects water temperature T 0:
If S301, water temperature T 0 are higher than highest alarm temperature T4, controller issues alarm signal, and issues hostdown and stop Vehicle signal；
If S302, water temperature T 0 are higher than maximum operating temperature T2, whether the positive aperture of controller detection triple valve is greater than 50%；
If the positive aperture of triple valve detects whether electric heater works less than 50%, if electric heater works, close Electric heater is closed, if electric heater does not work, detects whether the second fresh water pump works, if the second fresh water pump work, is closed Second fresh water pump issues system alarm signal if the second fresh water pump does not work, issues alarm；
If the positive aperture of triple valve is greater than 50%, triple valve is reversely opened to big by 10%, that is, cold water pipeline of performing fighting, is run After setting time t3, water temperature T 0 is detected, if being higher than maximum operating temperature T2, repeatedly step S3；
If S303, water temperature T 0 are located between minimum work water temperature T1 and highest work water temperature T2, it is flat that system is in dynamic Weighing apparatus state；
If S304, water temperature T 0 are lower than minimum work water temperature T1, detect the whether positive aperture of triple valve and be threaded to maximum, if not It is threaded to maximum, then triple valve is rotated in the forward direction 10%, runs setting time t3, if triple valve has been threaded to positive maximum, is carried out Step S305；
If S305, water temperature T 0 are higher than lower than minimum work water temperature T1 sets minimum limit temperature T3, controller control the Two fresh water pump works, after the second fresh water pump operation setting time t4, temperature sensor detects water temperature T 0；
If water temperature T 0 is higher than maximum operating temperature T2, repeatedly step S3；
If water temperature T 0 is located between minimum work water temperature T1 and highest work water temperature T2, system is in dynamic equilibrium shape State；
If water temperature T 0 is still higher than setting minimum limit temperature T3 lower than minimum work water temperature T1, controller control electricity Heater work carries out step S3, otherwise issues water temperature if water temperature T 0 is higher than minimum work water temperature T1 in setting time t4 Low-temperature warning；
If S306, water temperature T 0 are lower than minimum limit temperature T3, water temperature low-temperature warning is issued.
The present invention has the advantages that the present invention makes full use of host waste heat from tail gas combination electric heater to low temperature Fresh water is heated, and the high temperature fresh water after heating carries out heat exchange with liquid LNG and is vaporized, and the low temperature fresh water after heat exchange is recyclable It uses, there are energy-saving and emission-reduction, make full use of the environment-friendly function of waste gas residual heat.The present invention also passes through controller and temperature sensor pair Water temperature carries out dividing setting control than understanding, can both automatically control, and can also switch to and manually control, energy-saving effect is obvious, example Such as when 100% flow, power 50kw；When 75%-85% flow, power 22kw；When 40%-60% flow, function Rate is 4kw, and after having grade adjusting, the temperature rise of fresh water pump is substantially reduced, and reduces mechanical wear and maintenance work.The present invention is also Controller can be communicated with host computer, be convenient for full ship power device centralized control and monitoring.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the structural schematic diagram 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 temprature control method in the present invention.
In Fig. 1: 1-LNG liquid storage bottle, 2- gas stop valve, 3- fresh water temperature control system, 4- shut-off valve, 5-LNG temperature Sensor, 6- gas pressure reducer, 7- cooling gas check valve, 8- pressure sensor, 9-LNG pipeline, 10- gas mixing bottle, 11- master Machine；
In Fig. 2: the first fresh water pump of 301-, 302- temperature sensor, the second fresh water pump of 303-, 304- triple 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- exhaust pipe road, 901- liquid LNG pipe Road, 902- gaseous state LNG pipeline.
Specific embodiment
In order to which the object of the invention, technical solution and advantage is more clearly understood, with reference to the accompanying drawings and embodiments, to this Invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, and does not have to It is of the invention in limiting.
As shown in Figure 1, LNG bifuel system includes passing through the sequentially connected LNG liquid storage bottle 1 of LNG pipeline 9, gas mixing Bottle 10 and host 11 is disposed with gas between LNG liquid storage bottle 1 and gas mixing bottle 10 on LNG pipeline 9 from left to right Shut-off valve 2, LNG temperature sensor 5, pressure sensor 8, gas pressure reducer 6, cooling gas check valve 7, gas pressure reducer 6 and pressure Sensor 8 is disposed with 2 He of gas stop valve on LNG pipeline 9 from left to right between gas mixing bottle 10 and host 11 Pressure sensor 8.LNG pipeline 9 includes liquid LNG pipeline 901 shown in Fig. 2 and gaseous state LNG pipeline 902.LNG temperature sensing Device, pressure sensor are used to measure the temperature and pressure for the gaseous state LNG for passing through LNG heater and are shown in panel.Gas subtracts Pressure valve controls LNG gas pressure in setting value for reducing LNG gas.Cooling gas check valve is for avoiding high pressure gas from flowing back. Gas mixing bottle is for mixing LNG gas and air, convenient for burning.
Shown in Fig. 1, a kind of fresh water temperature control system using host waste heat from tail gas gasification LNG, fresh water temperature control The periphery of the LNG pipeline 9 for connecting LNG liquid storage bottle 1 and gas mixing bottle 10 is arranged in system 3, is used for liquid LNG gasification Host 11 is supplied to after mixing with air it together, shut-off valve 4 is installed, such as on the inlet pipeline of fresh water temperature control system Shown in Fig. 2, fresh water temperature control system 3 includes cold water pipeline 308, hot water line 309, the triple valve driven by motor 305 304, inlet pipeline 310, LNG heater 313, outlet pipeline 307, tail gas pipeline 306 and controller 314；
One end of cold water pipeline 308 is connect with outlet pipeline 307, and the other end is connect with the first port of triple valve 304； One end of hot water line 309 is connect with outlet pipeline 307, and the other end is connect with the second port of triple valve 304, hot water line Heater exhaust gas 312 and electric heater 311 are provided on 309；One end of inlet pipeline 310 and the third port of triple valve 304 Connection, the other end are connect with the water inlet of LNG heater 313, and the first fresh water pump 301 has been installed in parallel on inlet pipeline 310 With the second fresh water pump 303, the exit of inlet pipeline 310 is equipped with temperature sensor 302；The side of LNG heater 313 is equipped with Water inlet and gas outlet, the other side are equipped with inlet and water outlet, and the water outlet and outlet pipeline 307 of LNG heater 313 connect It connects, the inlet of LNG heater 313 is connect 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 host tail gas pipeline, the air inlet company of the other end and heater exhaust gas 312 It connects, the gas outlet of heater exhaust gas 312 connects an exhaust pipe road 316；Controller 314 respectively with electric heater 311, motor 305, the first fresh water pump 301, the second fresh water pump 303, temperature sensor 302 connect；
Before host 11 starts, controller 314 controls triple valve 304 by motor 305 and is in positive maximum position, that is, is connected to Hot water line 309 and inlet pipeline 310 close cold water pipeline 308 and inlet pipeline 310, then control electric heater 311 and the The work of one fresh water pump 301, the water temperature T 0 in inlet pipeline 310 that controller 314 is detected according to temperature sensor 302 judge host Can 11 start, if water temperature T 0 reaches minimum work water temperature T1, host 11 starts, and host tail gas and electric heater heat together The water of hot water pipeline is flowed through, if water temperature T 0 is higher than highest work water temperature T2, adjusts three by the opening size judgement of triple valve The aperture of port valve closes electric heater, if water temperature T 0 is lower than minimum work water temperature T1, starts 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 are board-like Heat exchanger.LNG plate heat exchanger is BB ZL series Denier plate heat exchanger, and there are two types of different moire angles on each plate Degree can get six kinds of runner combinations, selected model made to obtain best match between heat transfer property, pressure drop and economy.Tail Gas plate heat exchanger, there are two types of different ripple angles on each plate, can get six kinds of runners combinations, are passing selected model Best match is obtained between hot property, pressure drop and economy.LNG heater and heater exhaust gas are all with plate heat exchanger Form exchanges heat through row, at the beginning of diesel engine starting, when delivery temperature deficiency, enables electric heater and carries out auxiliary heating so that LNG It can completely vaporize, and LNG conveyance conduit is under high pressure conditions always.The plate heat exchanger used in the present embodiment can be selected Parallel plate type heat exchanger, due to the special shape of template, runner direction and section between plate constantly change, and fluid is logical Strong disturbance is formed in road, is destroyed thermal boundary layer constantly, to be effectively reduced thermal resistance, improves 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 are to have from energy-absorbing The IRG type vertical single stage pipeline hot water centrifugal pump of power.Two fresh water pumps are automatically controlled by controller, when underload only use one it is light Water pump provides fresh water to LNG heater, when the aperture of load increase and triple valve has been large enough to and is not able to satisfy load still It is required that when, then another fresh water pump is incorporated to enlargement discharge.Two fresh water pumps can be reached with 50% load respectively at this time The burden requirement of the maximum fresh-water flow (100%) of cooling system.By hydrodynamics it is found that the cube of shaft power P and revolving speed n It is directly proportional, therefore, work as discharge reduction, when pump rotary speed declines, power will be reduced very much, therefore can reach apparent 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 biography Sensor.This sensor is to be increased using metal material resistance value with the raising of temperature, is installed among fresh water pipeline. The detecting element of PT100 sensor is inserted directly into fresh water, is not had to shell and is protected, to avoid the air between thermal resistance and shell Influence heat transfer rate.Medium escapes when to prevent from replacing or overhaul sensor, using special spring capsule structure, and this biography The thermal inertia very little of sensor can experience the variation of temperature immediately.
In a preferred embodiment of the invention, as shown in Fig. 2, controller is ENGARD controller, which is used 8032 single-chip microcontrollers have the function of the Automatic Control of PI Controller, by printing electric circuit board, solid-state relay, electricity Source filter, transformer and connecting terminal block etc. form, and have 8 differential process devices, memory and input defeated on printed circuit board It makes an excuse out.Controller carries out proportional integration (PI) setting control to fresh water temperature, can both automatically control, converted when necessary It can manually control.Controller controls servo motor movement according to temperature signal to change the aperture of triple valve.ENGARD control Utensil has the advantage that energy-saving effect is obvious, such as when 100% flow, power 50kw；When 75%-85% flow, function Rate is 22kw；When 40%-60% flow, power 4kw；After having grade adjusting, pump motor temperature rise is decreased obviously, simultaneously Reduce mechanical wear and maintenance work；Defencive function is reliable, eliminates motor because burning out motor caused by overload or single-phase operation The phenomenon that；Have the function of perfect self-test, control, display, various faults alarm etc., improves the reliability of system.Fresh water pump It is controlled with triple valve by the relevant parameter of controller, there is very strong adaptability and flexibility.
In a preferred embodiment of the invention, electronic as shown in Fig. 2, triple valve is ZDLQ (X) electronic type electric T-shaped valve Three-way control valve is made of 3810L series electronic formula executing agency with three-way control valve.Servo function is included, unified 4- is received Current signal is transformed into corresponding straight-line displacement by the standard signal of 20MA or I-5VDC, is automatically controlled to adjust valve and is opened Degree, reaches the temperature to fluids within pipes.The motor of triple valve is automatically controlled by controller, when load increases, ENGARD control Unit automatic control motor starting processed flows through tail gas to reduce the aperture of three-way control valve and reduce bypass amount so as to increase The fresh-water flow of heater.
In a preferred embodiment of the invention, as shown in Fig. 2, electric heater is that DDR U F (50) -380/80-ex electricity adds Hot device, tubular electric heating, heat tube shape, structure type: flanged joint, flange latus rectum be 50mm, voltage rating 380V, Rated power is the anti-explosion electric heater of 80kw.Electric heater can only enable in both cases, first is that just starting diesel engine When, delivery temperature is insufficient, and to vaporize LNG sufficiently, fresh water is heated in Ying Qiyong electric heating；Second is that causing 30 minutes load is excessive When interior fresh water temperature is unable to reach set temperature always, electric heater is enabled.
In the present invention, fresh water can be recycled.LNG heater makes it sufficiently gasify using fresh water heating liquid LNG.Electricity Heater is used to, when tail gas heat quantity deficiency, carry out auxiliary heating in the initial stage of host-initiated.Temperature sensor is located at The import of LNG heater, for detecting the fresh water temperature for entering LNG heater.Aperture of the motor for changing triple valve, control Flow through the flow of the fresh water of heater exhaust gas.Heater exhaust gas is for the exhaust gas by the heat transfer of tail gas to fresh water, after heat exchange It is discharged through exhaust pipe road.
A kind of fresh water temprature control method based on above system, comprising the following steps:
S1, system are opened, and controller initialization, controller is in positive maximum position, tool by motor control triple valve Body, controller detection judge whether to be in positive maximum position by triple valve that (note: positive maximum as triple valve hot water line opens To maximum, cold water pipeline is closed), positive maximum is opened into if not triple valve is then controlled；
S2, controller control timer start timing, control the first fresh water pump and electric heater operation setup time t1, and Judge that can host start according to the water temperature T 0 in the inlet pipeline of temperature sensor detection, if water temperature T 0 is in setting time t1 When reaching minimum work water temperature T1, then the ready signal of host fuel system is exported, starts host, if in setting time t1 Not up to set water temperature then issues electric heater fault alarm；
When S3, host-initiated, controller exports timer timing signal t2, and be delayed setting time t2, host operation setting After time t2, temperature sensor detects water temperature T 0:
If S301, water temperature T 0 are higher than highest alarm temperature T4, controller issues alarm signal, and issues hostdown and stop Vehicle signal；
If S302, water temperature T 0 are higher than maximum operating temperature T2, whether the positive aperture of controller detection triple valve is greater than 50%；
It is defeated if electric heater works if the positive aperture of triple valve detects whether electric heater works less than 50% Electric heater shutdown signal out closes electric heater if electric heater does not work and detects whether the second fresh water pump works, if Second fresh water pump work then exports the second fresh water pump shutdown signal, closes the second fresh water pump, if the second fresh water pump does not work, System alarm signal is issued, alarm is issued；
If the positive aperture of triple valve is greater than 50%, triple valve reversed (note: reversed cold water pipeline of performing fighting) is opened big 10%, that is, cold water pipeline of performing fighting, controller output starting timer timing signal t3 after running setting time t3, detects water temperature T0, if being higher than maximum operating temperature T2, repeatedly step S3；
If S303, water temperature T 0 are located between minimum work water temperature T1 and highest work water temperature T2, i.e. when 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 T 0 are lower than minimum work water temperature T1, detect the whether positive aperture of triple valve and be threaded to maximum, if not It is threaded to maximum, then triple valve is rotated in the forward direction 10%, controller starts timer, and be delayed t3, setting time t3 is run, if threeway Valve has been threaded to positive maximum, then carries out step S305；
If S305, water temperature T 0 are higher than lower than minimum work water temperature T1 sets minimum limit temperature T3, i.e. T1 > T0≤T3, then Controller exports the second fresh water pump working signal, the second fresh water pump work, while controller control timer work, and be delayed t4, After second fresh water pump operation setting time t4, temperature sensor detects water temperature T 0；
If water temperature T 0 is higher than maximum operating temperature T2, i.e. T0 > T2, then repeatedly step S3；
If water temperature T 0 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 T 0 is still higher than setting minimum limit temperature T3 lower than minimum work water temperature T1, controller opens meter When device, setting limitation time t4, control electric heater work, if water temperature T 0 in setting time t4 be higher than minimum work water temperature T1 then carries out step S3, otherwise issues water temperature low-temperature warning；
If S306, water temperature T 0 are lower than minimum limit temperature T3, water temperature low-temperature warning is issued.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description, And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.

Claims (4)

1. a kind of fresh water temperature control system using host waste heat from tail gas gasification LNG, system setting is for connecting LNG storage The periphery of the LNG pipeline of liquid bottle and gas mixing bottle, for being supplied to master together after mixing with air it liquid LNG gasification Machine, which is characterized in that the system comprises cold water pipeline, hot water line, the triple valve being driven by motor, inlet pipeline, LNG to add Hot device, outlet pipeline, tail gas pipeline and controller；
One end of the cold water pipeline is connect with outlet pipeline, the first port connection of the other end and triple valve；The hot water One end of pipeline is connect with outlet pipeline, the second port connection of the other end and triple valve, is provided on the hot water line Heater exhaust gas and electric heater；One end of the inlet pipeline and the third port of triple valve connect, and the other end adds with LNG The water inlet of hot device connects, and has been installed in parallel the first fresh water pump and the second fresh water pump, the inlet pipeline on the inlet pipeline Exit temperature sensor is installed；The side of the LNG heater be equipped with water inlet and gas outlet, the other side be equipped with into The water outlet of liquid mouth and water outlet, the LNG heater is connect with outlet pipeline, the inlet and liquid of the LNG heater LNG piping connection, the gas outlet of the LNG heater and gaseous state LNG piping connection；One end of the tail gas pipeline connects host The air inlet of tail gas pipeline, the other end and heater exhaust gas connects, and the gas outlet of the heater exhaust gas connects exhaust gas row Put pipeline；The controller is connect 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, i.e. connection hot water line and water inlet by motor control triple valve Pipeline closes cold water pipeline and inlet pipeline, then controls electric heater and the first fresh water pump work, controller are passed according to temperature Water temperature T 0 in the inlet pipeline of sensor detection judges that can host start, main if water temperature T 0 reaches minimum work water temperature T1 Machine starting, host tail gas and electric heater heat the water for flowing through hot water pipeline together, if water temperature T 0 is higher than highest work water temperature T2 When, the aperture of regulating three-way valve is judged by the opening size of triple valve or closes electric heater, if water temperature T 0 is lower than minimum work Make water temperature T 1, starts the second fresh water pump.
2. system according to claim 1, which is characterized in that the LNG heater and heater exhaust gas are board-like change Hot device.
3. system according to claim 1, which is characterized in that first fresh water pump, the second fresh water pump are to have certainly The IRG type vertical single stage pipeline hot water centrifugal pump of energy-absorbing power.
4. a kind of fresh water temprature control method based on system described in any of the above claim, which is characterized in that including following Step:
S1, system are opened, and controller initialization, controller is in positive maximum position by motor control triple valve；
S2, controller control the first fresh water pump and electric heater operation setup time t1, and according to temperature sensor detection into Water temperature T 0 in water lines judges that can host start, if water temperature T 0 reaches minimum work water temperature T1 in setting time t1, The ready signal of host fuel system is then exported, host is started；
After S3, host operation setting time t2, temperature sensor detects water temperature T 0:
If S301, water temperature T 0 are higher than highest alarm temperature T4, controller issues alarm signal, and issues hostdown parking letter Number；
If S302, water temperature T 0 are higher than maximum operating temperature T2, whether the positive aperture of controller detection triple valve is greater than 50%；
If the positive aperture of triple valve detects whether electric heater works less than 50%, if electric heater works, electricity is closed Heater detects whether the second fresh water pump works if electric heater does not work, if the second fresh water pump work, closes second Fresh water pump issues system alarm signal if the second fresh water pump does not work, issues alarm；
If the positive aperture of triple valve is greater than 50%, triple valve is reversely opened to big by 10%, that is, cold water pipeline of performing fighting, operation setting After time t3, water temperature T 0 is detected, if being higher than maximum operating temperature T2, repeatedly step S3；
If S303, water temperature T 0 are located between minimum work water temperature T1 and highest work water temperature T2, system is in dynamic equilibrium shape State；
If S304, water temperature T 0 are lower than minimum work water temperature T1, detect the whether positive aperture of triple valve and be threaded to maximum, if not being threaded to Triple valve is then rotated in the forward direction 10% by maximum, runs setting time t3, if triple valve has been threaded to positive maximum, carries out step S305；
If S305, water temperature T 0 are higher than lower than minimum work water temperature T1 sets minimum limit temperature T3, controller control second is light Pump working, after the second fresh water pump operation setting time t4, temperature sensor detects water temperature T 0；
If water temperature T 0 is higher than maximum operating temperature T2, repeatedly step S3；
If water temperature T 0 is located between minimum work water temperature T1 and highest work water temperature T2, system is in dynamic balance state；
If water temperature T 0 is still higher than setting minimum limit temperature T3 lower than minimum work water temperature T1, controller controls electric heating Device work carries out step S3 if water temperature T 0 is higher than minimum work water temperature T1 in setting time t4, otherwise issues water temperature low temperature Alarm；
If S306, water temperature T 0 are lower than minimum limit temperature T3, water temperature low-temperature warning is issued.
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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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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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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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
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