CN104595063A - Liquefied natural gas gasification system based on cooling water residual heat of dual-fuel ship engine - Google Patents
Liquefied natural gas gasification system based on cooling water residual heat of dual-fuel ship engine Download PDFInfo
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Abstract
The invention discloses a liquefied natural gas gasification system based on cooling water residual heat of a dual-fuel ship engine. The liquefied natural gas gasification system is composed of four subsystems including a cylinder sleeve cooling water circulating system, a working medium circulating system, an LNG supply gasification system and a PLC (Programmable Logic Controller) control system, wherein the cylinder sleeve cooling water circulating system comprises a cylinder sleeve water pump, a cooling water tank, an LNG/diesel oil dual-fuel engine, a plate type heat exchanger and a fan type heat radiator; the working medium circulating system comprises a working medium box and a working medium pump; the working medium box is connected with a working medium inlet of the plate type heat exchanger by a working medium outlet; the LNG supply gasification system comprises an LNG pump, an LNG gasification device and an auxiliary LNG storage tank; the auxiliary LNG storage tank is connected with the LNG gasification device by a manual adjusting valve, the LNG pump, a third liquid flow sensor and a third liquid proportion adjusting valve in sequence. According to the liquefied natural gas gasification system, the residual heat of cylinder sleeve water of the LNG/diesel oil dual-fuel engine is used for gasifying the LNG and the high-temprature cylinder sleeve water is cooled and radiated; meanwhile, the combustion efficiency of the fuel of the LNG/diesel oil dual-fuel engine is also improved.
Description
Technical field
The present invention relates to the equipment technical field of used heat gasification LNG (Liquefied Natural Gas, liquified natural gas), particularly relate to a kind of LNG gasification system of LNG/ diesel dual-fuel ship engine cooling water waste heat.
Background technique
Compared with traditional diesel engine, LNG/ Diesel Dual-Fuel Engine has the advantages such as noxious emission is few, can meet the emission regulation demands of increasingly stringent, be a kind of power system of green, is expected to be widely used in boats and ships, urban transportation, generator set and medium and heavy cargo vehicle etc.And the liquid LNG at-162 DEG C of temperature needs to be gasificated as gaseous state before becoming motor fuel, and every kilogram of LNG gasification needs to absorb 837kJ heat.Thus simultaneously, the effective thermal efficiency of conventional engines is less than 50%, and all the other heats of 25% are taken away by waste gas, and the heat of other 20% is taken away by jacket-cooling water, remains 5% and is dispersed into air by thermal radiation and lubricant oil.
Publication number CN103899440A (publication date on 07 02nd, 2014) discloses a kind of gas peculiar to vessel/duel fuel engine LNG gasification system based on exhaust energy recovery and control methods, comprise heat transferring medium case, exhaust gas heat exchanger, radiator, engine expansion water tank, LNG vaporizer, catch tray, heat transferring medium in heat transferring medium case enters exhaust gas heat exchanger by the first regulating flow quantity pump, after radiator, enter LNG vaporizer flow back to heat transferring medium case again, external water source enters engine expansion water tank by catch tray respectively through three-way valve, discharge after radiator, enter external water source and the heat transferring medium not blending of radiator, namely according to each self-corresponding tube runs.This technology is reclaimed by duel fuel engine exhaust waste heat, and for LNG gasification, but do not relate to the waste heat recovery of jacket-cooling water.
The document of China Patent Publication No. CN103967648A (publication date on August 6th, 2014) provides a kind of marine low speed diesel residual heat comprehensive recovery system, comprise combination afterheat boiler system, power turbine power generation system, turbine generating system, high-temperature cooling water utilizes heat transmission equipment and organic working medium turbine generating system, jacket water organic working medium preheater wherein in parallel with jacket water heat exchanger, operationally, organic working medium enters mid temperature heat exchanger and enters organic working medium vaporizer section again after jacket water organic working medium preheater, the organic working medium driving steam turbine power generation system of high pressure is used for generating electricity, the used heat of diesel cylinder sleeve water is used for generate electricity.Not relating to the gasification technology of LNG/ Diesel Dual-Fuel Engine and LNG, at present, having no about reclaiming cooling water heat and technology for the LNG that gasifies is reported.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of liquified natural gas gasification system based on liquified natural gas/diesel dual-fuel ship engine cooling water waste heat, can reclaim cooling water heat and for the LNG that gasifies.
The technical solution used in the present invention is: by the jacket-cooling water circulatory system, duplex matter system, LNG supplies gasification system and these four sub-System's composition of PLC control system, the jacket-cooling water circulatory system comprises cylinder sleeve water pump, cooling water tank, LNG/ Diesel Dual-Fuel Engine, plate type heat exchanger and fan type radiating device, connecting tube between the jacket water water outlet of LNG/ Diesel Dual-Fuel Engine and the jacket water water intake on cooling water tank top is connected to the first temperature transducer successively, first three-way valve, first liquid flow transducer and first liquid ratio adjusting valve, the Centronics port of the first three-way valve connects with engine-cooling system short circle, jacket water water outlet bottom cooling water tank connects with the Centronics port of first threeway between first, second liquid electromagnetic valve, is connected to cylinder sleeve water pump between the jacket water water outlet bottom cooling water tank and the Centronics port of first threeway, the upper end-hole of first threeway connects with plate type heat exchanger, and the lower end mouth of first threeway connects with fan type radiating device water inlet, plate type heat exchanger water outlet is connected with the left port of second threeway, the 3rd liquid electromagnetic valve is connected between plate type heat exchanger water outlet and the left port of second threeway, the right output port of second threeway connects with the water outlet of fan type radiating device, between the right output port and the water outlet of fan type radiating device of second threeway, be connected to the 4th liquid electromagnetic valve, the Centronics port of second threeway is connected with the jacket water water intake of LNG/ Diesel Dual-Fuel Engine through liquid non-return valve, the second three-way valve, the second temperature transducer, and the Centronics port of the second three-way valve connects with engine-cooling system short circle, first, second temperature transducer described, first liquid ratio adjusting valve, first liquid flow transducer, cylinder sleeve water pump, first, second, third, fourth liquid non-return valve all connect the PLC in PLC control system, duplex matter system comprises working medium case, working medium pump, working medium case, by the working medium import of sender property outlet connecting plate type heat exchanger, is connected to second liquid ratio adjusting valve, second liquid flow transducer, working medium pump, three-temperature sensor successively between working medium case and plate type heat exchanger, the sender property outlet of plate type heat exchanger is connected with the working medium import of LNG vaporizer, and the sender property outlet of LNG vaporizer is connected with the working medium import of working medium case, LNG supplies gasification system and comprises LNG pump, LNG vaporizer and auxiliary LNG storage tank, auxiliary LNG storage tank is connected with LNG vaporizer through manual modulation valve, LNG pump, the 3rd liquid flow sensor, the 3rd liquid fraction modulating valve successively, the gaseous natural gas outlet on LNG vaporizer top is connected with bottom rock gas voltage stabilizing gas tank, and the 3rd liquid flow sensor, the 3rd liquid fraction modulating valve, LNG pump connect PLC respectively, when cylinder sleeve outlet temperature is between 75 DEG C to 90 DEG C, PLC controls second, 3rd liquid electromagnetic valve is closed, first, 4th liquid electromagnetic valve is opened, high temperature jacket water is transported to heat release in fan type radiating device by cylinder sleeve water pump, jacket-cooling water after cooling flow back in the cylinder sleeve of LNG/ Diesel Dual-Fuel Engine through liquid non-return valve and absorbs heat, when cylinder sleeve outlet temperature is more than or equal to 90 DEG C, PLC controls liquid second, 3rd body solenoid valve is opened, first, 4th liquid electromagnetic valve is closed, high temperature jacket-cooling water is transported to plate type heat exchanger to working medium heat release from cylinder sleeve water outlet by cylinder sleeve water pump, cooling water temperature after heat release reduces, again get back in cylinder sleeve through liquid non-return valve and absorb heat, working medium pumps to working medium pump instruction by PLC from working medium case, to heat release LNG vaporizer after plate type heat exchanger heat absorption, again flows to plate type heat exchanger and absorb heat after heat release.
Beneficial effect of the present invention is:
1. the invention provides a set of auxiliary LNG gasification system, the waste heat of the jacket water of LNG/ Diesel Dual-Fuel Engine is utilized to gasify to LNG, accomplished, to high temperature jacket water cooling heat dissipation, to turn improve the combustion efficiency of LNG/ Diesel Dual-Fuel Engine fuel simultaneously.
2. present invention employs PLC automatically to control system, the accurate conveying of working medium, rock gas, jacket water can be ensured and ensure that the Security of operator.
3. the present invention adopts cooperatively interacting of temperature transducer, flow transducer, liquid fraction modulating valve and PLC control system in engine cold-start process, instead of traditional motor thermostat, the temperature of the cooling water entering cylinder sleeve of engine is accurately controlled, thus the cooling water guaranteeing finally to enter LNG/ Diesel Dual-Fuel Engine cylinder sleeve keeps the best chilling temperature of cylinder sleeve of engine.
For a more detailed description to the present invention below in conjunction with the drawings and the specific embodiments.
Accompanying drawing explanation
Fig. 1 is the structural representation of the liquified natural gas gasification system that the present invention is based on double fuel engine of boat and ship cooling water heat;
In figure: 1. gas solenoid valve; 2. rock gas voltage stabilizing gas tank; 3. pressure transducer; 4. manual modulation valve; 5. gas ratio modulating valve; 6. combustion gas filter cleaner; 7. rock gas/air mixer; 8. cylinder; 9.PLC controller; 10. reducing tee; 11. cooling gas check valves; 12.LNG vaporizer; 13. liquid fraction modulating valve; 14. liquid flow sensors; 15. three-way valve; 16. temperature transducers; 17. three-way valve; 18. liquid non-return valves; 19. cooling water tanks; 20.LNG/ Diesel Dual-Fuel Engine; 21. plate type heat exchangers; 22. high temperature cylinder sleeve water pumps; 23. working medium liquid level sensors; 24. working medium casees; 25. liquid fraction modulating valve; 26. temperature transducers; 27. temperature transducers; 28. temperature transducers; 29. flow transducers; 30. working medium pumps; 31. liquid flow sensors; 32. liquid fraction modulating valve; 33,34,35,36. liquid electromagnetic valves; 37. adjustable speed motors; 38. fan type radiating devices; 39.LNG pump; 40. manual modulation valves; 41. natural gas leaking alarms; 42. auxiliary LNG storage tank; 43.LNG liquid level sensor; 44. cooling gas check valves; 45. flash steams (Boil Off Gas is called for short BOG, flash steam) storage tank; 46. gas pressure sensors; 47. temperature transducers; 48. temperature transducers.
Embodiment
As shown in Figure 1, the present invention, by four sub-System's composition, is the jacket-cooling water circulatory system, duplex matter system, LNG supply gasification system and PLC control system respectively.
The jacket-cooling water circulatory system comprises high temperature cylinder sleeve water pump 22, cooling water tank 19, LNG/ Diesel Dual-Fuel Engine 20, plate type heat exchanger 21, fan type radiating device 38 and connecting tube etc.Jacket water water outlet on the left of LNG/ Diesel Dual-Fuel Engine 20 is connected by pipeline with between the jacket water water intake on cooling water tank 19 top, and the connecting tube between the jacket water water outlet and the jacket water water intake on cooling water tank 19 top of LNG/ Diesel Dual-Fuel Engine 20 is connected to temperature transducer 16, three-way valve 15, liquid flow sensor 14, liquid fraction modulating valve 13 successively.Wherein, the Centronics port of three-way valve 15 is connected with engine-cooling system short circle by pipeline.Jacket water water outlet bottom cooling water tank 19 is connected by pipeline with the Centronics port of the threeway between liquid electromagnetic valve 33 and liquid electromagnetic valve 34, and the connecting tube between the Centronics port of the threeway therewith of the jacket water water outlet bottom cooling water tank 19 is connected to high temperature cylinder sleeve water pump 22.The upper end-hole of the threeway between liquid electromagnetic valve 33 and liquid electromagnetic valve 34 connects with the high temperature jacket water water intake of plate type heat exchanger 21 left upper portion, connecting tube between the upper end-hole and the high temperature jacket water water intake of plate type heat exchanger 21 left upper portion of this threeway connects liquid electromagnetic valve 34, the lower end mouth of this threeway connects with the water inlet on the left of fan type radiating device 38, and the pipeline between the water inlet on the left of the lower end mouth of this threeway and fan type radiating device 38 connects liquid electromagnetic valve 33.The high temperature jacket water water outlet of plate type heat exchanger 21 lower right side is connected by pipeline with the left port of threeway 29, pipeline between the high temperature jacket water water outlet and the left port of threeway 29 of plate type heat exchanger 21 lower right side is connected to a liquid electromagnetic valve 35, the right output port of threeway 29 is connected by pipeline with between the water outlet on the right side of fan type radiating device 38, on the right side of the right output port and fan type radiating device of threeway 29 38 water outlet between pipeline on be connected to a liquid electromagnetic valve 36.Wherein, fan type radiating device 38 connects adjustable speed motor 37, is driven by adjustable speed motor 37; The Centronics port of threeway 29 is connected by pipeline with between the jacket water water intake on the right side of LNG/ Diesel Dual-Fuel Engine 20, connecting tube between the jacket water water intake on the right side of the Centronics port and LNG/ Diesel Dual-Fuel Engine 20 of threeway 29 is connected to liquid non-return valve 18, three-way valve 17, temperature transducer 27 successively, wherein, the Centronics port of three-way valve 17 is connected with engine-cooling system short circle by pipeline.In the jacket-cooling water circulatory system, temperature transducer 16,27, liquid flow sensor 14 is all connected with Analog input mModule by signaling line, then connects PLC 9; PLC 9 is connected with amplifier by guide line, connects the adjustable speed motor 37 on liquid fraction modulating valve 13, high temperature cylinder sleeve water pump 22, liquid non-return valve 33,34,35,36 and fan radiator 38 afterwards respectively.
Duplex matter system comprises working medium case 24, working medium pump 30 and connecting tube etc.Wherein, working medium case 24 left lower is sender property outlet, working medium case 24 passes through the working medium import of the right upper portion of sender property outlet and pipe connecting formula heat exchanger 21, the connecting tube between working medium case 24 and plate type heat exchanger 21 is connected to successively liquid fraction modulating valve 32, liquid flow sensor 31, working medium pump 30, temperature transducer 28.The sender property outlet of plate type heat exchanger 21 left lower is connected by pipeline with between the working medium import of LNG vaporizer 12 hypomere sidepiece, and the connecting tube between the sender property outlet and the working medium import of LNG vaporizer 12 hypomere sidepiece of plate type heat exchanger 21 left lower is connected to a temperature transducer 26.The sender property outlet of LNG vaporizer 12 left upper portion is connected by pipeline with between the working medium import of working medium case 24 upper right, connecting tube between the sender property outlet and working medium case 24 upper right of LNG vaporizer 12 left upper portion is connected to a temperature transducer 47, and temperature transducer 47 is as far as possible near the sender property outlet end of LNG vaporizer 12 left upper portion.A working medium liquid level sensor 23 is connected on the top of working medium case 24.In duplex matter system, liquid flow sensor 31, temperature transducer 28,26,47, working medium liquid level sensor 23 is all connected with Analog input mModule by signaling line, then connects PLC 9; PLC 9 is connected with amplifier by guide line, connects liquid fraction modulating valve 32, working medium pump 30 afterwards respectively.
LNG supplies gasification system and comprises LNG pump 39, LNG vaporizer 12, auxiliary LNG storage tank 42, flash steam storage tank 45, reducing tee 10, rock gas voltage stabilizing gas tank 2, combustion gas filter cleaner 6, rock gas/air mixer 7, cylinder 8 and connecting tube etc.Wherein, assist and be connected by pipeline between LNG storage tank 42 with the LNG import of LNG vaporizer 12 bottom, the connecting tube between auxiliary LNG storage tank 42 and the LNG import of LNG vaporizer 12 bottom is connected to successively manual modulation valve 40, LNG pump 39, liquid flow sensor 29, liquid fraction modulating valve 25.The gaseous natural gas outlet on LNG vaporizer 12 top is connected by pipeline with between the gaseous natural gas import bottom rock gas voltage stabilizing gas tank 2, and the gaseous natural gas on LNG vaporizer 12 top exports on the connecting tube between the gaseous natural gas import bottom rock gas voltage stabilizing gas tank 2 and is connected to temperature transducer 48, cooling gas check valve 11, reducing tee 10 successively.Wherein the Centronics port of reducing tee 10 is connected by pipeline with between the upper port of flash steam storage tank 45, and the connecting tube between the Centronics port and the upper port of flash steam storage tank 45 of reducing tee 10 is equipped with a gas solenoid valve 1.One pressure transducer 46 is housed on the top of flash steam storage tank 45.Auxiliary LNG storage tank 42 left upper portion is connected by pipeline with between the bottom of flash steam storage tank 45, the connecting tube between auxiliary LNG storage tank 42 left upper portion and the bottom of flash steam storage tank 45 is equipped with a cooling gas check valve 44.Be connected by pipeline between combustion gas filter cleaner 6 with rock gas voltage stabilizing gas tank 2 top, connecting tube between combustion gas filter cleaner 6 and rock gas voltage stabilizing gas tank 2 top is connected to manual modulation valve 4, gas ratio modulating valve 5 successively, wherein, a pressure transducer 3 is equipped with at the top of rock gas voltage stabilizing gas tank 2.Be connected by pipeline between combustion gas filter cleaner 6 with rock gas/air mixer 7, be connected by pipeline between rock gas/air mixer 7 with cylinder 8.Supply in gasification system at LNG, liquid flow sensor 29, temperature transducer 48, liquid level sensor 43, pressure transducer 3 are all connected with Analog input mModule by signaling line, then connect PLC 9; PLC 9 is connected with amplifier by guide line, connects liquid fraction modulating valve 25, LNG pump 39, gas solenoid valve 1, gas ratio modulating valve 5 afterwards respectively.
PLC control system comprises temperature transducer 16, liquid fraction modulating valve 13, liquid flow sensor 14, temperature transducer 27, liquid fraction modulating valve 32, liquid flow sensor 31, temperature transducer 28, temperature transducer 26, working medium liquid level sensor 23, LNG liquid level sensor 43, liquid flow sensor 30, liquid fraction modulating valve 25, gas ratio modulating valve 5, gas solenoid valve 1, gas pressure sensor 46, liquid electromagnetic valve 33, 34, 35, 36, adjustable speed motor 37, PLC 9, temperature transducer 47, temperature transducer 48 and linking route etc.
Traditional motor adopts thermostat can automatically regulate the water yield entering radiator, to ensure that motor is in suitable temperature range work according to the temperature height of cooling water.The present invention adopts temperature transducer 16 and flow transducer 14 to engine cold-start process, liquid fraction modulating valve 13 and PLC control system have been come, namely the short circle of jacket-cooling water is realized by LNG/ Diesel Dual-Fuel Engine 20 and three-way valve 17 and three-way valve 15 miscellaneous part, temperature transducer 16 detects the water temperature of cylinder sleeve water outlet, when water temperature slowly meets or exceeds 75 DEG C, now short circle no longer meets the cooling requirement of motor, at this moment cooling water system major cycle will be progressed into, because now the temperature difference is smaller, heat transfer effect is not obvious, plate type heat exchanger 21 can not provide enough heats for LNG gasification, therefore arrange only when cylinder sleeve outlet temperature reaches 90 DEG C, just start to adopt plate type heat exchanger 21 to carry out heat exchange, when outlet jacket water temperature is between 75 DEG C and 90 DEG C, system is drained with the heat of fan radiator 38 by middle high temperature jacket water, jacket-cooling water after heat radiation is got back in circulation loop.
When cylinder sleeve outlet temperature is between 75 DEG C to 90 DEG C, now PLC 9 controls liquid electromagnetic valve 34,35 and is all in closed condition, and control liquid electromagnetic valve 33,36 and be in opening state, now high temperature jacket water is transported to fan type radiating device 38 from cylinder sleeve water outlet and carries out heat release by jacket-cooling water pump 22, jacket-cooling water after cooling flow back in the cylinder sleeve of motor through liquid non-return valve 18 and absorbs heat, and adjustable speed motor 37 can regulate rotation speed of the fan to regulate the size of heat dissipating capacity.When cylinder sleeve outlet temperature is when being more than or equal to 90 DEG C, now, PLC 9 controls liquid electromagnetic valve 34,35 and is all in opening state, and liquid electromagnetic valve 33,36 is in closed condition, high temperature jacket-cooling water is transported to working medium heat release plate type heat exchanger 21 from cylinder sleeve water outlet by cylinder sleeve water pump 22, carries out heat exchange at this and working medium, and the cooling water temperature after heat release reduces, again get back in cylinder sleeve through liquid non-return valve 18 and absorb heat, circulate with this.What order about that jacket-cooling water circulates is cylinder sleeve water pump 22, and cooling water tank 19 is for storing unnecessary or supplementary not enough cooling water.The effect of liquid non-return valve 18 prevents the cooling water in cooling water small-size circulating loop from flowing back in plate type heat exchanger 21 or fan type radiating device 38, impel cooling water can only in major cycle one-way flow.
Cooling water is after major cycle flowing, and PLC 9 starts to working medium pump 30 instruction, working medium is pumped from working medium case 24, to heat release LNG vaporizer 12 after plate type heat exchanger 21 heat absorption.After heat release, Temperature of Working reduces, and again flows to plate type heat exchanger 21 and absorb heat in jacket-cooling water, circulate with this by pipeline, circulates resistance and relies on working medium pump 30 to overcome.Working medium case 24 stores working medium that is unnecessary or that supplement deficiency.LNG pump 39 is ordered about LNG and is assisted LNG storage tank 42 to flow to LNG vaporizer 12, and be gasificated into rock gas at this from working medium absorption heat, natural gas storing is in rock gas surge tank 2, in rock gas/air mixer 7, inflammable mixture is mixed into, the work done of inhaling air in-cylinder combustion after the filtering of natural gas via combustion gas filter cleaner 6.When cylinder 8 only works with diesel oil, high temperature jacket-cooling water does not flow through plate type heat exchanger 21, but flows through fan type radiating device 38, and the cooling water after cooling is flow direction engine cylinder sleeve again, and working medium and LNG vaporizer 12 do not participate in work.Wherein, the effect of liquid flow sensor 31 is the flows measuring working medium pipeline, and the effect of temperature transducer 47 is the temperature values detecting sender property outlet place in LNG vaporizer 12, and the effect of liquid fraction modulating valve 32 is sizes of controlled medium flow.The working medium entrance of plate type heat exchanger 21 and outlet end are equipped with a temperature transducer 26 and temperature transducer 28 respectively, are used for respectively measuring the working medium entrance of plate type heat exchanger 21 and the temperature value of outlet end.One working medium liquid level sensor 23 is housed for monitoring the liquid level height of working medium in working medium case 24 above working medium case 24.
Cooling water is after major cycle flowing, LNG extracts out and enters LNG vaporizer 12 by LNG pump 39 from auxiliary LNG storage tank 42, and in LNG vaporizer 12, absorb the heat of working medium, and make LNG be gasificated into rock gas, be stored in rock gas voltage stabilizing gas tank 2 by cooling gas check valve 11, refluxing for preventing rock gas is provided with cooling gas check valve 11.Rock gas voltage stabilizing gas tank 2 is the rock gas of LNG/ Diesel Dual-Fuel Engine 20 stable storage pressure, forms inflammable mixture after the filtering of natural gas via combustion gas filter cleaner 6 with air in rock gas/air mixer 7, sucks in cylinder 8 work done of burning.Flow transducer 29 is provided with in order to detect LNG stream amount in real time, and temperature transducer 48 detects LNG vaporizer 12 air outlet temperature, the effect of gas ratio modulating valve 5 is the flows controlling rock gas, the effect of manual modulation valve 40 is the break-makes of LNG in manual tune LNG pipeline, the effect of manual modulation valve 4 is manual tune rock gas break-makes in pipeline, when system jam, staff can close manual modulation valve 40 and manual modulation valve 4 timely, to prevent the generation of dangerous situation, when PLC 9 normal operation, manual modulation valve 40 and manual modulation valve 4 are often opened, and aperture is maximum.Setting pressure sensor 3 above rock gas voltage stabilizing gas tank 2, the gas pressure in rock gas voltage stabilizing gas tank 2 is measured in its effect.Be provided with liquid level sensor 43 in auxiliary LNG storage tank 42, LNG liquid level height in auxiliary LNG storage tank 42 is measured in its effect.Because the LNG in auxiliary LNG storage tank 42 can produce evaporation, this part gas is called as BOG flash steam, BOG flash steam makes LNG storage tank 42 meteorological spatial pressure raise, this part BOG flash steam enters into flash steam storage tank 45 by cooling gas check valve 44, the effect of cooling gas check valve 44 prevents flash steam from refunding in auxiliary LNG storage tank 42, flash steam storage tank 45 is connected with rock gas voltage stabilizing gas tank 2 through reducing tee 10, flash steam can be made like this to enter in rock gas voltage stabilizing gas tank 2, gas solenoid valve 1 is had between flash steam storage tank 45 and reducing tee 10, its effect controls flash steam to enter into the through and off that rock gas voltage stabilizing fills with 2, pressure transducer 46 is provided with above flash steam storage tank 45, its effect is the pressure measuring rock gas in flash steam storage tank 45.In LNG gasification system, respectively at nozzle flange place, flash steam storage tank 45 two ends, the nozzle flange place, two ends of LNG pump 39, auxiliary flange joint between LNG storage tank 42 and LNG pump 39, the nozzle flange joint of the gas inlet and outlet of LNG vaporizer 12, a natural gas leaking alarm 41 is all equipped with at outlet(discharge) flange joint and the nozzle flange place, flash steam storage tank 45 two ends of rock gas voltage stabilizing gas tank 2, at the nozzle flange place, two ends of LNG pump 39, a natural gas leaking alarm 41 is housed respectively, flange place between flash steam storage tank 45 and LNG pump 39 is also connected to a natural gas leaking alarm 41, at the nozzle flange place of the gas inlet and outlet of LNG vaporizer 12, a natural gas leaking alarm 41 is also housed respectively, the effect of alarm is when rock gas occurs to leak, staff can Timeliness coverage, and make corresponding measure in time.
Claims (6)
1., based on a liquified natural gas gasification system for double fuel engine of boat and ship cooling water heat, supply gasification system and these four sub-System's composition of PLC control system by the jacket-cooling water circulatory system, duplex matter system, LNG, it is characterized in that:
The jacket-cooling water circulatory system comprises cylinder sleeve water pump (22), cooling water tank (19), LNG/ Diesel Dual-Fuel Engine (20), plate type heat exchanger (21) and fan type radiating device (38), connecting tube between the jacket water water outlet of LNG/ Diesel Dual-Fuel Engine (20) and the jacket water water intake on cooling water tank (19) top is connected to the first temperature transducer (16) successively, first three-way valve (15), first liquid flow transducer (14) and first liquid ratio adjusting valve (13), the Centronics port of the first three-way valve (15) connects with engine-cooling system short circle, the jacket water water outlet of cooling water tank (19) bottom connects with the Centronics port of first threeway between first, second liquid electromagnetic valve (33,34), between the jacket water water outlet and the Centronics port of first threeway of cooling water tank (19) bottom, be connected to cylinder sleeve water pump (22), the upper end-hole of first threeway connects with plate type heat exchanger (21), and the lower end mouth of first threeway connects with fan type radiating device (38) water inlet, plate type heat exchanger (21) water outlet is connected with the left port of second threeway (29), the 3rd liquid electromagnetic valve (35) is connected between plate type heat exchanger (21) water outlet and the left port of second threeway (29), the right output port of second threeway (29) connects with the water outlet of fan type radiating device (38), between the right output port and the water outlet of fan type radiating device (38) of second threeway (29), be connected to the 4th liquid electromagnetic valve (36), the Centronics port of second threeway (29) is connected with the jacket water water intake of LNG/ Diesel Dual-Fuel Engine (20) through liquid non-return valve (18), the second three-way valve (17), the second temperature transducer (27), and the Centronics port of the second three-way valve (17) connects with engine-cooling system short circle, first, second temperature transducer described (16,27), first liquid ratio adjusting valve (13), first liquid flow transducer (14), cylinder sleeve water pump (22), first, second, third, fourth liquid non-return valve (33,34,35,36) all connect the PLC (9) in PLC control system, duplex matter system comprises working medium case (24), working medium pump (30), working medium case (24), by the working medium import of sender property outlet connecting plate type heat exchanger (21), is connected to second liquid ratio adjusting valve (32), second liquid flow transducer (31), working medium pump (30), three-temperature sensor (28) successively between working medium case (24) and plate type heat exchanger (21), the sender property outlet of plate type heat exchanger (21) is connected with the working medium import of LNG vaporizer (12), and the sender property outlet of LNG vaporizer (12) is connected with the working medium import of working medium case (24), LNG supplies gasification system and comprises LNG pump (39), LNG vaporizer (12) and auxiliary LNG storage tank (42), auxiliary LNG storage tank (42) is connected with LNG vaporizer (12) through manual modulation valve (40), LNG pump (39), the 3rd liquid flow sensor (29), the 3rd liquid fraction modulating valve (25) successively, the gaseous natural gas outlet on LNG vaporizer (12) top is connected with rock gas voltage stabilizing gas tank (2) bottom, and the 3rd liquid flow sensor (29), the 3rd liquid fraction modulating valve (25), LNG pump (39) connect PLC (9) respectively,
When cylinder sleeve outlet temperature is between 75 DEG C to 90 DEG C, PLC (9) controls second, 3rd liquid electromagnetic valve (34, 35) close, first, 4th liquid electromagnetic valve (33, 36) open, high temperature jacket water is transported to heat release in fan type radiating device (38) by cylinder sleeve water pump (22), jacket-cooling water after cooling flow back in the cylinder sleeve of LNG/ Diesel Dual-Fuel Engine (20) through liquid non-return valve (18) and absorbs heat, when cylinder sleeve outlet temperature is more than or equal to 90 DEG C, PLC (9) controls liquid second, 3rd body solenoid valve (34, 35) open, first, 4th liquid electromagnetic valve (33, 36) close, high temperature jacket-cooling water is transported to plate type heat exchanger (21) to working medium heat release from cylinder sleeve water outlet by cylinder sleeve water pump (22), cooling water temperature after heat release reduces, again get back in cylinder sleeve through liquid non-return valve (18) and absorb heat, working medium pumps to working medium pump (30) instruction by PLC (9) from working medium case (24), to heat release LNG vaporizer (12) after plate type heat exchanger (21) heat absorption, again flows to plate type heat exchanger (21) and absorb heat after heat release.
2. according to claim 1 based on the liquified natural gas gasification system of double fuel engine of boat and ship cooling water heat, it is characterized in that: between LNG vaporizer (12) and rock gas voltage stabilizing gas tank (2), be connected to the 4th temperature transducer (48) successively, first cooling gas check valve (11) and reducing tee (10), the Centronics port of reducing tee (10) is connected with the upper port of flash steam storage tank (45), one gas solenoid valve (1) is housed between reducing tee (10) and flash steam storage tank (45), a pressure transducer (46) is equipped with on the top of flash steam storage tank (45), auxiliary LNG storage tank (42) is connected with flash steam storage tank (45), one second cooling gas check valve (44) is housed between auxiliary LNG storage tank (42) and flash steam storage tank (45), 4th temperature transducer (48), first, second cooling gas check valve (11,44), gas solenoid valve (1), pressure transducer (46) connect PLC (9) respectively.
3. according to claim 1 based on the liquified natural gas gasification system of double fuel engine of boat and ship cooling water heat, it is characterized in that: rock gas voltage stabilizing gas tank (2) top is connected with combustion gas filter cleaner (6), connecting tube between combustion gas filter cleaner (6) and rock gas voltage stabilizing gas tank (2) top is connected to successively manual modulation valve (4), gas ratio modulating valve (5), a pressure transducer (3) is equipped with at the top of rock gas voltage stabilizing gas tank (2), combustion gas filter cleaner (6) is connected with rock gas/air mixer (7), rock gas/air mixer (7) is connected with cylinder (8), gas ratio modulating valve (5), pressure transducer (3) connect PLC (9) respectively.
4. according to claim 1 based on the liquified natural gas gasification system of double fuel engine of boat and ship cooling water heat, it is characterized in that: the connecting tube between the sender property outlet of LNG vaporizer (12) and working medium case (24) is connected to one the 5th temperature transducer (47), the 5th temperature transducer (47) is near the sender property outlet end of LNG vaporizer (12).
5. according to claim 1 based on the liquified natural gas gasification system of double fuel engine of boat and ship cooling water heat, it is characterized in that: be connected to a working medium liquid level sensor (23) on the top of working medium case (24), working medium liquid level sensor (23) connects PLC (9) by signaling line.
6. according to claim 1 based on the liquified natural gas gasification system of double fuel engine of boat and ship cooling water heat, it is characterized in that: adjustable speed motor (37) is housed on fan radiator (38), adjustable speed motor (37) connects PLC (9).
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