CN105156883A - LNG gasification pressure regulating device and LNG gasification pressure regulating process - Google Patents
LNG gasification pressure regulating device and LNG gasification pressure regulating process Download PDFInfo
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- CN105156883A CN105156883A CN201510678620.5A CN201510678620A CN105156883A CN 105156883 A CN105156883 A CN 105156883A CN 201510678620 A CN201510678620 A CN 201510678620A CN 105156883 A CN105156883 A CN 105156883A
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Abstract
The invention discloses an LNG gasification pressure regulating device and an LNG gasification pressure regulating process. The LNG gasification pressure regulating device comprises an LNG low-temperature storage tank, an air-heated reheating machine, a gasification mechanism, a water-soluble electric heater, a double-path pressure regulating pipeline and an odorization mechanism, wherein the LNG low-temperature storage tank is connected with the gasification mechanism through a low-temperature pneumatic shut-off valve, the gasification mechanism comprises two air-heated gasification machines connected in parallel, the gasification mechanism is connected with the double-path pressure regulating pipeline through a gas-liquid separator, a pipeline between the gasification mechanism and the double-path pressure regulating pipeline is connected with a parallel branch, the water-soluble electric heater is arranged on the branch, the double-path pressure regulating pipeline is connected with the odorization mechanism, the front side of the double-path pressure regulating pipeline is connected with a loop, and the gas-liquid separator is arranged in the loop which is communicated with a flash steam pipeline. According to the LNG gasification pressure regulating device, the safe and stable gasified pressure regulation of LNG can be realized, and by adopting the combination of single-path pressure regulation of the double-path pressure regulating pipeline and the flash steam pipeline with the odorization mechanism, the LNG gasification pressure regulating device has the functions of filtering, regulating the pressure, dispersing, and cutting, and has the advantages of safety, stability, high operation precision and environmental friendliness.
Description
Technical field
The present invention relates to LNG gasification voltage-regulating technique field, be specifically related to a kind of LNG gasification regulator and gasification pressure regulation technique thereof.
Background technique
LNG is the abbreviation of LNG Liquefied natural gas, it be rock gas is dewatered, after the purified treatment such as de-hydrocarbon, desulfurization, removing CO2, liquefaction process-162 DEG C time and being formed, leading composition is CH4.LNG liquidus density is 0.42Kg/L, when its volume is mark state 1/625.LNG greatly reduces transport and the carrying cost of rock gas.The application of LNG technology is regarded as a revolution of World Natural Gas Industrial.The volume of world trade of LNG has accounted for more than 25% of global combustion gas volume of trade, plays great function to the supply of adjustment world rock gas.Making do not have the air feed of the country of source of the gas and source of the gas exhaustion to be guaranteed, then can play peak regulation and supplementary effect to there being the country of source of the gas.LNG is widely used in generating, city domestic gas and industrial combustion gas.LNG contains a large amount of cryogenic energy simultaneously, utilizes its cold energy can carry out cold energy generation, air separation, ultra low temperature cool house, manufacture dry ice, frozen foods etc.
Because the project scale of rock gas long-distance transportation through pipeline is large, invest high, the construction period is long, in the short time, long-distance transport pipes are difficult to arrive most of small and medium-sized cities.Although high pressure can be utilized rock gas volume-diminished about 250 times (CNG) to be transported, then the mode of its step-down is solved the natural air-air source problem of urban.But CNG air feed has complex process, and manufacturing mechanism is many, energy per volume density is less, and pressure store is higher, dangerous larger problem.Make full use of LNG and develop Small Urban Gas Market in advance, for rock gas extensive network air feed in future is paved the way, carry out the various work of Natural Gas Conversion in advance, for the development accelerating China's natural gas cause plays positive impetus.
Due to LNG natural gas liquefaction plant dispatch from the factory toward LNG transport vehicle fill time pressure very low (LNG be under low pressure conducive to store and transport, and the relative evaporation of LNG transport vehicle is very low, guarantee that its pressure increase in transportation process is very slow), so accompanying LNG transport vehicle is before filling LNG toward bus, need by its jury-rigged air-heated booster, pressure to be raised, after being filled to onboard fuel bottle, because it is not in saturation state, have portion gas in fuel cylinder to be liquefied, cause pressure to reduce.And LNG pressure is too low, the normal traveling of vehicle can be affected, be such as short of power, accelerate, grade ability is poor.
Summary of the invention
The present invention is directed to the problem of existing LNG gasification pressure regulation, provide a kind of LNG gasification regulator and gasification pressure regulation technique thereof.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of LNG gasification regulator, comprise LNG low-temperature storage tank, empty warm recuperator, gasification mechanism, water dissolving type electric heater, double-channel voltage-regulating pipeline and odorization machine structure, LNG low-temperature storage tank is connected with gasification mechanism by low temperature pneumatic cut-off valve, gasification mechanism comprises two sky temperature vaporizers in parallel, gasification mechanism is connected with double-channel voltage-regulating pipeline by gas-liquid separator, gasification mechanism with the pipeline between double-channel voltage-regulating pipeline is connected a branch road in parallel, branch road is arranged water dissolving type electric heater, double-channel voltage-regulating pipeline is connected with odorization machine structure, odorization machine structure comprises controller, parallel-connected double-pump and odorization machine, odorization machine is connected with double-channel voltage-regulating pipeline by controller through parallel-connected double-pump, a loop is connected before double-channel voltage-regulating pipeline, loop arranges gas-liquid separator, loop communicates with flash steam pipeline.
Above-mentioned low temperature pneumatic cut-off valve is connected with explosion-proof electric control box respectively with odorization machine, and explosion-proof electric control box is connected with environmental temperature alarm and gas concentration alarm respectively.
Above-mentioned low temperature pneumatic cut-off valve passes behind an atmospheric valve and is connected with the empty warm recuperator of EAG.
Before above-mentioned two sky temperature vaporizers, a low temperature major axis stop valve is set respectively.
The atmospheric valve of above-mentioned sky temperature gasifier all communicates with drain; The liquid outlet of gas-liquid separator communicates with sewage draining exit.
The gasification pressure regulation technique of above-mentioned LNG gasification regulator, the liquid natural gas of the LNG low-temperature storage tank at genuine station enters the sky temperature vaporizer of gasification mechanism, endothermic gasification is enter double-channel voltage-regulating pipeline after rock gas, the flash steam of the flash steam pipeline at genuine station is also incorporated in double-channel voltage-regulating pipeline, natural gas via add smelly go out sled, concrete technology step is as follows:
(1) debug: slowly open entrance low temperature major axis stop valve, hear flow liquid sound and inlet duct frosting, slowly open empty temperature vaporizer outlet valve again, debug flash steam pipeline again, debugging bathing-water-type electric heater, notes during debugging observing medium temperature, when sky temperature gasifier exit medium temperature is lower than zero degree, artificial unlatching water-bath type electric heating recuperator, then debug odorization machine structure;
(2) start: open entrance low temperature major axis stop valve, make liquid natural gas enter empty temperature vaporizer to gasify, note the medium temperature of vaporizer outlets, if temperature is lower than 0 DEG C, just needs to start water dissolving type electric heater and carry out re-heat, after the rock gas gasified enters double-channel voltage-regulating pipeline, observe the inlet and outlet pressure of pressure governor, whether in the scope of expection setting, observe the working condition of flowmeter, odorization machine, if all normally, skid outlet valve can be opened, start air feed;
(3) add smelly: normal run after, the flame-proof switch of parallel-connected double-pump and the valve of import and export can all often be opened, but often will replace unlatching, if when gas flow is less, odorizing amount is little, when needing every day timed moderate adds smelly, open parallel-connected double-pump and first open delivery side of pump valve, then power-on switch, during termination of pumping, first close power switch, then close delivery side of pump valve, the parallel-connected double-pump of odorization machine needs often alternately to open; In odorization machine, smelly dose must not be less than 20% of liquid level meter, otherwise should supplement, and first closes liquid phase inlet stop valve during shutdown, cuts off liquid natural gas and enters empty temperature vaporizer, close empty temperature vaporizer outlet valve, system outlet valve afterwards.
The present invention has superpressure automatic evacuation function: when loine pressure exceedes setting value, and prying body safety valve is automatically opened and diffused; Manual safety controls: need urgent when reducing loine pressure, can carry out gas and diffuse by manually opened manual diffusion valve; Function of automatically cutting off: gasification after and pressure regulation after pressure superelevation time, gasification re-heat after temperature lower than zero degree, ambient temperature lower than setting value time, pneumatic cut-off valve is closed automatically; Leakage warning function: when gas leakage reaches finite concentration, automatic sound-light alarm, pneumatic cut-off valve is closed automatically; Artificial re-heat function: when gasifier exit medium temperature is lower than zero degree, manually can open recuperator.
Present invention achieves the gasification pressure regulation of LNG safety and stability, adopt double-channel voltage-regulating pipeline and the pressure regulation of flash steam pipeline single channel in conjunction with odorization machine structure, there is filtration, pressure regulation, the function diffusing and cut off, there is the advantage of the high and environmental protection of safety and stability, performance accuracy.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the structural representation of apparatus of the present invention.
1LNG low-temperature storage tank, 2 low temperature pneumatic cut-off valves, the empty warm recuperator of 3EAG, 4 explosion-proof electric control boxes, 5 low temperature major axis stop valves, 6 empty temperature vaporizers, 7 water dissolving type electric heaters, 8 double-channel voltage-regulating pipelines, 9 gas-liquid separators, 10 controllers, 11 parallel-connected double-pumps, 12 odorization machines, 13 environmental temperature alarms, 14 gas concentration alarms, 15 skid outlets, 16 drains, 17 sewage draining exits, 18 flash steam pipelines in figure.
Embodiment
As shown in the figure, a kind of LNG gasification regulator, comprise LNG low-temperature storage tank 1, empty warm recuperator 3, gasification mechanism, water dissolving type electric heater 7, double-channel voltage-regulating pipeline 8 and odorization machine structure, LNG low-temperature storage tank 1 is connected with gasification mechanism by low temperature pneumatic cut-off valve 2, gasification mechanism comprises two sky temperature vaporizers 6 in parallel, gasification mechanism is connected with double-channel voltage-regulating pipeline 8 by gas-liquid separator 9, gasification mechanism with the pipeline between double-channel voltage-regulating pipeline 8 is connected a branch road in parallel, branch road is arranged water dissolving type electric heater 7, double-channel voltage-regulating pipeline 8 is connected with odorization machine structure, odorization machine structure comprises controller 10, parallel-connected double-pump 11 and odorization machine 12, odorization machine 12 is connected with double-channel voltage-regulating pipeline 8 by controller 10 through parallel-connected double-pump 11, a loop is connected before double-channel voltage-regulating pipeline 8, loop is arranged gas-liquid separator 9, loop communicates with flash steam pipeline 18.Low temperature pneumatic cut-off valve 2 is connected with explosion-proof electric control box 4 respectively with odorization machine 12, and explosion-proof electric control box 4 is connected with environmental temperature alarm 13 and gas concentration alarm 14 respectively.Low temperature pneumatic cut-off valve 2 passes behind an atmospheric valve and is connected with the empty warm recuperator 3 of EAG.A low temperature major axis stop valve 5 is set before two sky temperature vaporizers 6 respectively.Empty warm vaporizer 6 atmospheric valve below all communicates with drain 16; The liquid outlet of gas-liquid separator 9 communicates with sewage draining exit 17.
The gasification pressure regulation technique of above-mentioned LNG gasification regulator, the liquid natural gas of the LNG low-temperature storage tank at genuine station enters the sky temperature vaporizer of gasification mechanism, endothermic gasification is enter double-channel voltage-regulating pipeline after rock gas, the flash steam of the flash steam pipeline at genuine station is also incorporated in double-channel voltage-regulating pipeline, natural gas via adds bromomenorrhea skid outlet 15 and goes out sled, and concrete technology step is as follows:
(1) debug: slowly open entrance low temperature major axis stop valve, hear flow liquid sound and inlet duct frosting, slowly open empty temperature vaporizer outlet valve again, debug flash steam pipeline again, debugging bathing-water-type electric heater, notes during debugging observing medium temperature, when sky temperature gasifier exit medium temperature is lower than zero degree, artificial unlatching water-bath type electric heating recuperator, then debug odorization machine structure;
(2) start: open entrance low temperature major axis stop valve, make liquid natural gas enter empty temperature vaporizer to gasify, note the medium temperature of vaporizer outlets, if temperature is lower than 0 DEG C, just needs to start water dissolving type electric heater and carry out re-heat, after the rock gas gasified enters double-channel voltage-regulating pipeline, observe the inlet and outlet pressure of pressure governor, whether in the scope of expection setting, observe the working condition of flowmeter, odorization machine, if all normally, skid outlet valve can be opened, start air feed;
(3) add smelly: normal run after, the flame-proof switch of parallel-connected double-pump and the valve of import and export can all often be opened, but often will replace unlatching, if when gas flow is less, odorizing amount is little, when needing every day timed moderate adds smelly, open parallel-connected double-pump and first open delivery side of pump valve, then power-on switch, during termination of pumping, first close power switch, then close delivery side of pump valve, the parallel-connected double-pump of odorization machine needs often alternately to open; In odorization machine, smelly dose must not be less than 20% of liquid level meter, otherwise should supplement, and first closes liquid phase inlet stop valve during shutdown, cuts off liquid natural gas and enters empty temperature vaporizer, close empty temperature vaporizer outlet valve, system outlet valve afterwards.
Claims (6)
1. a LNG gasification regulator, it is characterized in that comprising LNG low-temperature storage tank, empty warm recuperator, gasification mechanism, water dissolving type electric heater, double-channel voltage-regulating pipeline and odorization machine structure, LNG low-temperature storage tank is connected with gasification mechanism by low temperature pneumatic cut-off valve, gasification mechanism comprises two sky temperature vaporizers in parallel, gasification mechanism is connected with double-channel voltage-regulating pipeline by gas-liquid separator, gasification mechanism with the pipeline between double-channel voltage-regulating pipeline is connected a branch road in parallel, branch road is arranged water dissolving type electric heater, double-channel voltage-regulating pipeline is connected with odorization machine structure, odorization machine structure comprises controller, parallel-connected double-pump and odorization machine, odorization machine is connected with double-channel voltage-regulating pipeline by controller through parallel-connected double-pump, a loop is connected before double-channel voltage-regulating pipeline, loop arranges gas-liquid separator, loop communicates with flash steam pipeline.
2. LNG gasification regulator according to claim 1, it is characterized in that low temperature pneumatic cut-off valve is connected with explosion-proof electric control box respectively with odorization machine, explosion-proof electric control box is connected with environmental temperature alarm and gas concentration alarm respectively.
3. LNG gasification regulator according to claim 1, is characterized in that low temperature pneumatic cut-off valve passes behind an atmospheric valve and is connected with the empty warm recuperator of EAG.
4. LNG gasification regulator according to claim 1, arranges a low temperature major axis stop valve respectively before it is characterized in that two sky temperature vaporizers.
5. LNG gasification regulator according to claim 1, is characterized in that the atmospheric valve of empty temperature gasifier all communicates with drain; The liquid outlet of gas-liquid separator communicates with sewage draining exit.
6. the gasification pressure regulation technique of claim 1 or 2 or 3 or the gasification of the LNG described in 4 or 5 regulator, it is characterized in that the liquid natural gas of the LNG low-temperature storage tank at genuine station enters the sky temperature vaporizer of gasification mechanism, endothermic gasification is enter double-channel voltage-regulating pipeline after rock gas, the flash steam of the flash steam pipeline at genuine station is also incorporated in double-channel voltage-regulating pipeline, natural gas via add smelly go out sled, concrete technology step is as follows:
(1) debug: slowly open entrance low temperature major axis stop valve, hear flow liquid sound and inlet duct frosting, slowly open empty temperature vaporizer outlet valve again, debug flash steam pipeline again, debugging bathing-water-type electric heater, notes during debugging observing medium temperature, when sky temperature gasifier exit medium temperature is lower than zero degree, artificial unlatching water-bath type electric heating recuperator, then debug odorization machine structure;
(2) start: open entrance low temperature major axis stop valve, make liquid natural gas enter empty temperature vaporizer to gasify, note the medium temperature of vaporizer outlets, if temperature is lower than 0 DEG C, just needs to start water dissolving type electric heater and carry out re-heat, after the rock gas gasified enters double-channel voltage-regulating pipeline, observe the inlet and outlet pressure of pressure governor, whether in the scope of expection setting, observe the working condition of flowmeter, odorization machine, if all normally, skid outlet valve can be opened, start air feed;
(3) add smelly: normal run after, the flame-proof switch of parallel-connected double-pump and the valve of import and export can all often be opened, but often will replace unlatching, if when gas flow is less, odorizing amount is little, when needing every day timed moderate adds smelly, open parallel-connected double-pump and first open delivery side of pump valve, then power-on switch, during termination of pumping, first close power switch, then close delivery side of pump valve, the parallel-connected double-pump of odorization machine needs often alternately to open; In odorization machine, smelly dose must not be less than 20% of liquid level meter, otherwise should supplement, and first closes liquid phase inlet stop valve during shutdown, cuts off liquid natural gas and enters empty temperature vaporizer, close empty temperature vaporizer outlet valve, system outlet valve afterwards.
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Cited By (6)
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| CN106641708A (en) * | 2016-11-07 | 2017-05-10 | 山东新兴重工科技发展有限公司 | Small natural gas gasification pry |
| CN107327702A (en) * | 2017-08-07 | 2017-11-07 | 苏州新锐低温设备有限公司 | A kind of Large LNG gasification double-channel voltage-regulating is integrally prized |
| CN107830403A (en) * | 2017-10-25 | 2018-03-23 | 上海新奥新能源技术有限公司 | A kind of liquefied natural gas liquid-supplying system |
| CN107883185A (en) * | 2017-07-04 | 2018-04-06 | 上海新奥新能源技术有限公司 | LNG feeders and its workflow, LNG air supply systems |
| CN108087723A (en) * | 2018-01-12 | 2018-05-29 | 江苏深绿新能源科技有限公司 | Global function Unattended remote monitoring vaporization voltage-regulating system |
| CN108547776A (en) * | 2018-04-18 | 2018-09-18 | 歌思（天津）低温设备有限公司 | A kind of double pump cavitation-preventive loading system |
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| CN107327702A (en) * | 2017-08-07 | 2017-11-07 | 苏州新锐低温设备有限公司 | A kind of Large LNG gasification double-channel voltage-regulating is integrally prized |
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| CN108087723A (en) * | 2018-01-12 | 2018-05-29 | 江苏深绿新能源科技有限公司 | Global function Unattended remote monitoring vaporization voltage-regulating system |
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| CN108547776A (en) * | 2018-04-18 | 2018-09-18 | 歌思（天津）低温设备有限公司 | A kind of double pump cavitation-preventive loading system |
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