926 results about "Liquefied natural gas" patented technology

The invention relates to the technical field of liquefied natural gas sampling, and discloses an automatic liquefied natural gas sampling method convenient to operate. The method comprises the following steps: acquiring historical sampling data in a preset sampling period and generating a data set; extracting historical sample characteristic parameters, and establishing a trend change characteristic matrix; constructing a multi-dimensional state space according to the matrix, and calculating the state aggregation degree of historical sampling abnormal events to determine a sample feature early warning index set; extracting real-time sample characteristic parameters and establishing vectors, and performing spatial position correlation calculation with the early warning index set to determine real-time risk correlation factors; and generating a risk probability prediction model in combination with the real-time risk association factor, the historical sample feature parameter set and the trend change feature matrix, predicting a sampling anomaly probability and generating an adjustment suggestion. According to the method, historical data and real-time analysis are utilized, the sampling accuracy and adaptability are improved, manual intervention is reduced, and a more reliable mode is provided for liquefied natural gas sampling.

The invention discloses a low-temperature environment LNG (Liquefied Natural Gas) metering sensor drift compensation method and system, and particularly relates to the technical field of sensor drift compensation. Output data of a sensor are collected and processed, and a temperature compensation model of the sensor is established; in the working temperature range, digital filtering processing is carried out on data of displacement change of each measuring range point, and then analysis and mining are carried out; a data longitudinal interval in a temperature range is refined by using a table look-up method, so that the data interval is reduced. And calculating the G value according to the residual error obtained by the table look-up method and the numerical value change condition in each temperature section. If the G value is greater than a preset threshold value of the system, selecting a proper fitting method, such as a least square method or Legendre orthogonal polynomial fitting, according to the distribution of the G value and the data interval when curve fitting is used, so as to further optimize the temperature compensation model; and if the G value is smaller than the system preset threshold value, no subsequent operation is carried out.

The invention relates to the technical field of ship power, in particular to a dual-fuel ship fuel switching method and device and a storage medium, and the method comprises the steps that first engine performance data and engine state data corresponding to the first engine performance data are acquired; preprocessing the first engine performance data and the engine state data; the preprocessed first engine performance data are input into a target prediction control model for switching strategy prediction, and a fuel switching strategy corresponding to the engine is obtained; inputting the engine state data into the target fault prediction model for fault prediction to obtain a switching decision; a fuel switching strategy is sent to the control module according to the switching decision, so that the control module processes the fuel switching process according to the fuel switching strategy; and second engine performance data are received, and the fuel switching strategy is adjusted according to the second engine performance data. And seamless switching or cooperative use between liquefied natural gas and diesel oil of a ship can be met.

The invention discloses a liquefied natural gas (LNG) early warning system and method for dynamically monitoring an LNG ship, and the method comprises the steps: collecting the output amount, cabin pressure, environment temperature and pump operation parameters in real time, combining a multi-factor correction model to dynamically calculate the actual evaporation rate, and reversely setting an allowable evaporation rate threshold according to the maximum capability of a BOG processing system; the evaporation rate is ensured to be within a safe range through a grading alarm mechanism and safety regulation and control measures; the problem that in the prior art, static testing cannot reflect evaporation rate changes in real time is solved. Liquefied natural gas whole life cycle monitoring and performance degradation early warning of the LNG ship are achieved.

The invention relates to a sealed and insulated container for liquefied natural gas transportation, liquefied natural gas is contained in the sealed and insulated container, the sealed and insulated container serves as a containment system to be arranged inside a ship body of a transportation ship, and the sealed and insulated container comprises two film shielding layers and two insulating layers. A first thin film shielding layer, a first insulating layer, a second thin film shielding layer and a second insulating layer are arranged from inside to outside, and first square insulating plates in the first insulating layer and second square insulating plates in the second insulating layer are arranged in a staggered mode. The interplate gaps in the first insulating layer and the interplate gaps in the second insulating layer are mutually staggered, and the metal connecting pieces at the four corners of each first square insulating block are connected to the center position of the second square insulating block. Through staggered arrangement of the insulating layers, direct heat conduction of gaps between the plates is avoided, cold leakage can be avoided through a circulating double-layer channel, and the modular arrangement is convenient and rapid to install and high in safety.

The invention discloses a corrugated plate for a low-temperature liquid cargo system, a shielding layer and the low-temperature liquid cargo system. The cryogenic liquid cargo system may be a storage tank or container for storing cryogenic liquid, such as liquefied natural gas. The corrugated plate comprises a corrugated plate plane layer and corrugations formed on the corrugated plate plane layer, the corrugations comprise first corrugations and second corrugations intersecting with the first corrugations, and each of the first corrugations and the second corrugations is provided with a protruding part, a concave part and a twisting part in the longitudinal extending direction of the first corrugations and the second corrugations. The convex part and the concave part are connected together through the torsion part in the longitudinal extending direction, the convex part protrudes towards the interior of the low-temperature liquid cargo system relative to the corrugated plate plane layer, and the concave part protrudes away from the interior of the low-temperature liquid cargo system relative to the corrugated plate plane layer. According to the scheme, the convex-concave matching structure is arranged in the longitudinal extension direction of the corrugations, so that the effect of blocking gas convection in the corrugated plate can be effectively achieved, evaporation of LNG in the storage tank can be effectively reduced, and then damage to goods is reduced.

The invention belongs to the technical field of natural gas dehydration, and particularly relates to dehydration equipment and method for liquefied natural gas purification, the dehydration equipment comprises a three-way pipe, a barrel and a dismounting mechanism, and a molecular sieve assembly is arranged in the barrel; the dismounting mechanism comprises a core shaft, a mounting block, a first clamping seat, a second clamping seat, a fixed ring and a sliding ring, one side of the mounting block is connected with the core shaft, the bottom side of the mounting block extends to be provided with a supporting block, and the first clamping seat is connected with the supporting block; the tail end of a piston rod of the hydraulic cylinder is hinged to the bottom end of the connecting rod; a fixed ring is fixedly arranged at the bottom end of the barrel, and a sliding ring is slidably arranged at the upper end of the barrel; when the second clamping base rotates to the position over the first clamping base, the barrel is in a vertical installation state. And when the second clamping seat rotates in the direction away from the mounting block, the barrel is in a horizontal disassembly state. According to the structure, the molecular sieve of the small-sized modular molecular sieve dehydration system can be conveniently disassembled and assembled; and the operations of natural gas dehydration and molecular sieve regeneration can be simultaneously performed.

The utility model provides an LNG fuel cabin supply system for a ship. The LNG fuel cabin supply system comprises a filling unit, a gasification unit, a fuel unit, a first collecting pipe, a first control valve, a second collecting pipe, a second control valve, a third collecting pipe, a third control valve, a fourth collecting pipe and a fourth control valve. The fuel unit comprises a fuel tank, a first liquid phase opening of the fuel tank is communicated with a liquid phase filling opening of the filling unit through a first collecting pipe, liquid of the filling unit can flow to the first liquid phase opening, and the first control valve is arranged on the first collecting pipe; a gas phase opening of the fuel tank is communicated with a gas phase filling opening of the filling unit through a second collecting pipe, and a second control valve is arranged on the second collecting pipe; the first liquid phase opening is communicated with an inlet of the gasification unit through a third collecting pipe, liquid in the fuel tank can flow to the gasification unit, and the third control valve is arranged on the third collecting pipe; the gas phase opening is communicated with the inlet of the gasification unit through a fourth collecting pipe, and the fourth control valve is arranged on the fourth collecting pipe.

The invention relates to the field of liquefied natural gas, in particular to a liquefied natural gas double-layer tank liquid nitrogen circulation cooling and fire extinguishing system and method. The system comprises a double-layer tank body, a liquid nitrogen cooling and fire extinguishing assembly and a liquid nitrogen collecting and circulating assembly, the double-layer tank body comprises an inner tank body and an outer tank body, the inner tank body is located in the outer tank body and provided with a temperature sensor, and a plurality of superconducting magnetic suspension supporting modules are arranged between the outer tank body and the inner tank body; the liquid nitrogen cooling and fire extinguishing assembly comprises a liquid nitrogen storage tank and a liquid nitrogen circulating main pipe, the liquid nitrogen circulating main pipe communicates with the liquid nitrogen storage tank and is spirally wound on the peripheral wall of the inner tank body, and a plurality of exhaust holes are formed in the part, located in the cavity, of the liquid nitrogen circulating main pipe in the extending direction; the liquid nitrogen collecting and circulating assembly comprises a loop pipe, a liquid nitrogen collecting tank and a circulating pipe, the loop pipe communicates with the cavity and the liquid nitrogen collecting tank and is further connected with an air suction pump and a cooling and pressurizing device in series, and the circulating pipe communicates with the liquid nitrogen collecting tank. The inner tank body can be rapidly and comprehensively cooled, and a fire can be rapidly extinguished when the fire occurs.

The invention discloses an LNG (liquefied natural gas) station site selection method and device based on multi-scene dynamic coupling, a computer and a storage medium, belongs to the technical field of LNG infrastructure planning and intelligent transportation, and solves the technical problem that LNG station site selection is difficult to accurately predict under multi-scene dynamic change. The method comprises the following steps: collecting multi-scene site selection data of the LNG filling station; data processing is carried out, and a space-time fusion big data medium table is constructed; constructing a long short-term memory network LSTM and reinforcement learning RL coupling model, and obtaining a real-time demand prediction result; a multi-constraint site selection optimization model is constructed, and an LNG gas station candidate site set is obtained; performing optimization through scene classification and feature modeling and defining a multi-scene layout criterion to obtain an LNG gas station candidate set adaptive to multiple scenes; according to the method, the site selection planning of the LNG filling station is realized by fusing the requirements and constraints of multiple scenes such as high speed, suburban, city and industrial districts, and the method is suitable for the field of administrative planning of the government and site selection planning of gas supply enterprises on the LNG filling station.

A self-adaptive fender system suitable for LNG side-by-side conveying is applied to an FSRU or FLNG or other fixed offshore LNG treatment platforms, movable fenders are fixed to the bow end and the stern end of a parallel midbody deck of a floating LNG receiving treatment platform respectively, and fixed fenders are fixed to the two ends of a collecting pipe area of the floating LNG receiving treatment platform respectively. The sound wave range finder is fixed to the end close to the bow portion of the fender body located on the bow portion of the parallel midbody deck, and the sound wave range finder is fixed to the end close to the stern portion of the fender body located on the stern portion of the parallel midbody deck. And the actual distance between the floating LNG receiving and processing platform and the LNG ship is continuously measured, the actual distance is compared with the theoretical distance, the movable fender moves till the actual distance is equal to the theoretical distance, and then the fender system automatically adapts to the parallel midbody range of the LNG ship. All the fender devices are always located in the parallel middle bodies of the two ships, and the situation that due to the fact that the positions of traditional fender devices cannot be adjusted, the traditional fender devices are located outside the parallel middle bodies of the LNG ships, and fenders fail is avoided.

The invention discloses an LNG (Liquefied Natural Gas) cold energy utilization system and method, and the system comprises an organic Rankine cycle power generation unit which is used for heating LNG to-70 DEG C to-40 DEG C and conveying the heated LNG to an intermediate medium cold storage unit; the intermediate medium cold storage unit is used for transferring the cold energy of the LNG to an intermediate medium and heating the LNG into gaseous NG at the same time; and the gas-liquid carbon dioxide energy storage unit is used for transferring the cold energy of the intermediate medium to carbon dioxide. The ultralow-temperature LNG cold energy at the front end is recycled through the organic Rankine cycle power generation unit, direct contact between carbon dioxide and LNG is avoided through the intermediate medium cold storage unit, the LNG tail end cold energy is effectively recycled and effectively transmitted to all links of the gas-liquid carbon dioxide energy storage unit, efficient recycling of the LNG cold energy is achieved, and the energy storage peak shaving capacity is achieved.

The invention discloses a ship LNG methanol dual-fuel intelligent switching control method, relates to the technical field of ship fuel switching control, and solves the problems that the current ship fuel switching judgment only depends on whether the ship fuel is located in a discharge forbidding area or not, and the concentration of residual fuel in a pipeline is lacked to be monitored in real time during ship fuel switching. The method comprises the following steps: obtaining a signal type of a fuel switching signal of a ship according to real-time navigation data; the external environment of the ship is obtained through analysis according to the real-time navigation data, and whether the ship meets pipeline purging conditions or not is judged based on the external environment; methanol use data and liquefied natural gas use data of fuel in the ship and pipeline use data of the ship are obtained, meanwhile, inert gas is controlled to purge a main input pipeline in the ship, and a pipeline purge completion instruction is obtained through purge; whether the fuel switching control of the ship is qualified or not is judged on the basis of the real-time working data, the fuel pipeline of the ship is swept in the fuel switching process, and the qualification rate of fuel switching of the ship is guaranteed.

The invention provides a welding quality detection method and platform for an LNG ship pipe fitting, and relates to the technical field of intelligent detection, and the method comprises the steps: determining the welding damage strength based on pipe fitting defect feature space analysis, calling a bearing performance evaluation channel to carry out performance influence analysis, and outputting a first potential performance influence coefficient; taking the standard pipe fitting welding image as a reference, performing similar traversal comparison on the pipe fitting surface image, and determining a second potential performance influence coefficient according to a deviation area proportion; evaluating and determining the damage strength of the pipe fitting according to the first potential performance influence coefficient and the second potential performance influence coefficient, and if the damage strength is greater than a strength threshold value, performing maintenance identification on the pipe fitting. According to the method, the problem that the real damage condition of the pipe fitting cannot be accurately judged due to the fact that targeted detection cannot be performed on the welding defects of the pipe fitting in combination with an application scene in an existing method can be solved, the defects on the surface and in the pipe fitting can be efficiently and accurately recognized, and the accuracy and reliability of pipe fitting damage evaluation are remarkably improved.

The invention discloses an ultralow-temperature cascade cold storage device, which belongs to the field of energy utilization and energy storage and comprises a cold quantity inlet, a porous structure, a cold flow spiral guide pipe, a first-stage cold storage structure, a partition plate I, a second-stage cold storage structure, a partition plate II, a third-stage cold storage structure, a shell, a cold quantity outlet, a hot flow inlet, a hot flow spiral guide pipe and a hot flow outlet. Through the phase change cold storage and sensible heat cold storage coupled composite energy storage system, redundant cold energy generated by gasification of liquefied natural gas in the daytime is stored in different cold storage media in a graded mode according to the temperature gradient, and cold storage and release are achieved through the refrigerant circulation system; when the gasification amount of the liquefied natural gas at night is reduced to cause insufficient cold energy supply, the cold storage device can accurately release low-temperature cold energy (-162 DEG C to-50 DEG C) and medium-temperature cold energy (-50 DEG C to 0 DEG C) stored in the cold storage device as required according to the real-time requirement of cold utilization equipment, and it is ensured that the cold energy utilization equipment can obtain stable cold energy supply under all-weather working conditions.

Provided are a micro-scale apparatus and method for liquefying natural gas The apparatus comprises a first heat exchanger that cools a natural gas feed stream by heat exchange with a first cooling fluid from a chiller, a compressor configured to compress the cooled natural gas, an air cooler configured to further cool the compressed natural gas, a second heat exchanger configured to further cool the natural gas by heat exchange with a second cooling fluid, a third heat exchanger configured to further cool the cooled natural gas, a joule-thompson (JT) valve configured to cool the flow of cooled natural gas to create LNG, a separator configured to separate a liquified LNG from a vapour phase, and a return flow path connected to the natural gas inlet, wherein the return flow path is optionally configured to pass as cooling medium via the third heat exchanger, wherein optionally the return flow path is configured to transport the vapour phase from the separator via the third heat exchanger for heating by heat exchange a gas flow entering the inlet of the third heat exchanger, and to combine the heated vapour phase with the natural gas feed stream.

The invention relates to the technical field of waste gas treatment equipment, and particularly discloses a waste gas recovery treatment device for LNG (Liquefied Natural Gas), which comprises a demister, the demister comprises a plurality of demisting blades, a desulfurization tower is provided with a dismounting opening, a dismounting device is arranged in the desulfurization tower, and the dismounting device comprises a mounting frame, a mounting rod, an adjusting rod, a rotating mechanism and an adjusting assembly. A sliding groove is formed in the mounting rod, the adjusting rod is movably matched with the sliding groove, the adjusting assembly drives the rotating mechanism to move, the rotating mechanism drives the adjusting rod to rotate, the adjusting rod drives the multiple demisting blades to get close to each other or get away from each other, and after the multiple demisting blades get close to each other to be adjusted, the adjusting assembly and the multiple demisting blades slide out of the disassembling opening to be disassembled. The adjusting assembly and the multiple demisting blades slide in from the dismounting opening, and the multiple demisting blades are installed after being separated from each other and adjusted; the waste gas recovery treatment device for the LNG has the effect that the use efficiency of the demister can be improved.

The invention relates to a zero-emission technology for producing power in a thermal plant using natural gas (NG) or liquefied natural gas (LNG), followed by capturing carbon dioxide (CO2) and converting it into green Dimethyl Ether (DME). The process integrates a gas-based combined cycle power plant with CO2 capture through Pressure Swing Adsorption (PSA) (106) and Monoethanolamine (MEA) purification. Captured CO2 undergoes a Reverse Water Gas Shift (RWGS) (306) reaction at temperatures above 900°C to form CO, which, along with syngas from steam methane reforming (308a, 308) at 525°C to 900°C and 25 ATA pressure, is converted into DME using a Cu / ZnO / Al2O3 catalyst at 250-300°C and 25-40 ATA. The process achieves an energy efficiency factor of 93.04%, producing 92 kg of DME per 48 kg of LNG, with a 94% greenhouse gas abatement, contributing to net-zero emissions (NZE) while generating bulk thermal power.

The invention relates to the field of natural gas industry, in particular to a marine LNG filling system and a filling method.The marine LNG filling system comprises a storage system, a filling system, a monitoring system and a data acquisition system, the storage system is used for storing liquefied natural gas, and the filling system is used for filling a fuel cabin of a ship with the liquefied natural gas; the monitoring system is used for controlling the filling process; and the data acquisition system is used for acquiring environmental data of a filling area and data of the filling system to provide a judgment reference for the monitoring system. By adopting the technical scheme, the environmental data and the filling system data acquired by the data acquisition system provide a judgment reference for the monitoring system, so that the intelligent degree of the monitoring system is greatly improved, and the problem that the monitoring system cannot respond in time due to sudden environmental change is avoided.

A method of controlling the renewable energy absorbed by a hybrid power train for driving a load, and in particular compressors for a liquefied natural gas (LNG) plant is disclosed. The method comprises an analysis of the health status of part and of the whole hybrid power plant that drive the load. A power plant is also disclosed, operated by the controlling method.

The invention discloses a marine LNG (Liquefied Natural Gas) double-wall pipe interlayer monitoring control system, comprising: a double-wall reinforcing member, which comprises a double-wall supporting telescopic member, an inner wall protection member and a supporting telescopic power member, and the double-wall supporting telescopic member is clamped in an interlayer between an inner wall pipe of a double-wall pipe and an outer wall pipe of the double-wall pipe through the connected inner wall protection member to provide support; the interlayer monitoring part comprises an interlayer monitoring part, a vacuumizing part, a control part and a diffusing part, the interlayer monitoring part monitors the interlayer on the outer wall pipe and transmits a monitoring signal to the control part, the vacuumizing part vacuumizes the interlayer on the outer wall pipe, the control part is electrically connected with the interlayer monitoring part and the vacuumizing part, and the diffusing part is electrically connected with the interlayer monitoring part and the vacuumizing part. And the diffusing part is connected with the vacuumizing part in a penetrating manner, and is used for intensively exhausting leaked gas outwards. The structure design is reasonable, the protection effect on the double-wall pipe is high, the leakage risk of the inner wall pipe can be effectively reduced, and the interlayer vacuum degree of the double-wall pipe can be monitored and controlled sensitively and reliably.

The invention discloses an LNG (Liquefied Natural Gas) cold energy gradient utilization system coupled with seawater desalination and liquefied air energy storage. A seawater desalination module of the system carries out seawater desalination by using cold energy of liquefied natural gas, and a liquefied air energy storage module carries out air compression and liquefaction in a power off-peak period and releases energy to generate power in a power peak period; the system can switch a seawater desalination priority mode, an energy storage peak regulation mode and a composite energy supply mode. According to the system, a double-loop structure is adopted, liquefied natural gas cold energy, solar heat energy, electric energy and environmental resources are fully coupled, multi-energy complementation, gradient utilization and combined cooling heating and power are achieved, flexible switching of three cooperative operation modes is achieved, the operation state of the system can be adjusted according to the external load requirement, the resource utilization efficiency and the operation economy are improved, and the energy consumption is reduced. The modular design has good expandability and engineering adaptability, has the characteristics of being green, energy-saving, environment-friendly, high in safety and stable in operation, and is suitable for guaranteeing regional water resources and balancing power generation fluctuation of unstable green energy.

The invention belongs to the technical field of LNG (liquefied natural gas) cold energy utilization, and provides an LNG gasification station cold energy utilization system coupled with liquid air energy storage, which comprises a first LNG heat exchange assembly, a second LNG heat exchange assembly and a third LNG heat exchange assembly, the second LNG heat exchange assembly comprises a second heat exchange subsystem, and a cold source and a heat source of the second heat exchange subsystem are LNG and power plant warm discharged water correspondingly; the ORC power generation assembly comprises a sixth heat exchanger and a first turbine generator, a cold source of the sixth heat exchanger is LNG, the LNG is output through an LNG outlet of the sixth heat exchanger, and a driving medium flowing part is arranged between a propane outlet of the sixth heat exchanger and the first turbine generator; and the air energy release assembly comprises a liquid air storage tank, and the output end of the liquid air storage tank communicates with a power generation mechanism. Liquefied air energy storage is conducted through LNG, meanwhile, the ORC cold energy power generation system is coupled, LNG cold energy is efficiently recycled, and self-generation and self-use of electric power are achieved.

The invention discloses a surface corrosion-resistant invar alloy precision strip for a liquid cargo cabin of a liquefied natural gas carrier and a manufacturing method. The surface corrosion-resistant invar alloy precision strip comprises the following components: 35.6%-37.1% of Ni, 0.35%-0.80% of Si, 0.05%-0.10% of Ce, 0.015%-0.030% of C, less than or equal to 0.35% of Mn, 0-0.0008% of O, less than or equal to 0.01% of N, less than or equal to 0.003% of S, less than or equal to 0.005% of P, less than or equal to 0.20% of Cr, less than or equal to 0.20% of Cu, less than or equal to 0.05% of Al, less than or equal to 0.003% of Ti and the balance of iron and inevitable impurity elements. According to the formula, through EAF, AOD, LF, continuous casting or die casting, hot continuous rolling or solid solution pickling after forging, cold rolling in multiple rolling processes, annealing and protective film prefabrication treatment, the temperature range of the prepared material is about 1.5-1.8 * 10 <-6 > / DEG C from-163 DEG C to 20 DEG C, the yield strength Rp0.2 value is larger than or equal to 300 MPa, the tensile strength Rm value is larger than or equal to 480 MPa, the ductility A50 is larger than or equal to 35%, surface corrosion does not occur within the machining period or storage and transportation time of 15 days under the conventional condition, and the service life of the material is prolonged. And particularly, the risk of surface rusting in the processing, storage and transportation processes is greatly reduced.

The LNG cold energy power generation, seawater desalination and ice making coupling system comprises a seawater cooler, a seawater heater, a seawater flash evaporator, a first refrigerant vaporizer, an LNG vaporizer, a steam turbine generator, an expansion and compression all-in-one machine, a second refrigerant heat exchanger, a seawater ice maker, an inclined plate ice-water separator and a rotary drum ice crystal washer. A low-grade heat source of an LNG receiving station is used for heating seawater for flash evaporation desalination, water vapor is condensed to produce fresh water, and a first refrigerant is heated and evaporated; the expansion and compression all-in-one machine is driven by pressure energy generated after LNG is vaporized and expanded to conduct mechanical compression work on the first refrigerant, and the operation efficiency of the first refrigerant driving steam turbine generator is improved. The vaporized low-temperature natural gas is reheated through a second refrigerant, and the work efficiency of the natural gas driven expansion and compression all-in-one machine is improved; and the second refrigerant extracts the LNG cold energy for seawater ice making, and ice slurry can be used for marine product preservation, industrial cooling, cold storage air conditioners, low-temperature refrigeration houses and fresh water supply after being separated and purified.

The invention discloses a seawater desalination and electrolytic hydrogen production integrated system and method based on LNG (Liquefied Natural Gas) cold energy recovery and solar-assisted ORC (Organic Rankine Cycle) power generation. The solar heat collection subsystem is connected with the organic Rankine cycle power generation subsystem in a heat exchange mode, the organic Rankine cycle power generation subsystem is internally provided with a first-stage heat exchange mode and is connected with the LNG cold energy utilization subsystem in a heat exchange mode, and the LNG cold energy utilization subsystem is connected with the frozen sea water desalination subsystem through a heat exchanger. The LNG cold energy utilization subsystem is in transmission connection with the electrolytic hydrogen production unit through the heat exchanger; the method comprises two working processes of seawater desalination and hydrogen production. According to the invention, a multi-energy complementary comprehensive energy system capable of simultaneously realizing two modes of seawater desalination and hydrogen production is formed, the stability and reliability of the system are improved, a seawater desalination and hydrogen production system dependent on single energy is reduced, the energy utilization rate is high, the energy-saving effect is good, and'one water for two purposes' is realized.

The invention provides a safety control system for ship-to-ship liquefied natural gas unloading. The system comprises a liquefied transport ship, a floating storage ship, a dynamic control module and a land terminal processing mechanism. The land terminal processing mechanism comprises a gas discharge unit and a liquid storage unit; the dynamic control module is composed of an unloading regulation and control unit, a temperature regulation and control unit and a pressure regulation and control unit. The output end of the transport ship is connected with the floating storage ship through a first liquid channel; the connecting output end of the floating storage ship is connected with the liquid storage unit through a second liquid channel; the floating storage ship is connected with the transport ship through a first gaseous loop; the floating storage ship is connected with the gas discharge unit through a second gaseous loop; the dynamic control module controls the first liquid channel, the second liquid channel, the first gaseous loop and the second gaseous loop to work through a remote network. The potential safety hazard caused by improper unloading rate control, temperature difference over-limit and insufficient pressure regulation of the liquefied natural gas in the prior art is solved.

The present invention relates to a low-emission device and method for a liquefied natural gas filling station with a pump, comprising a low-temperature storage tank (10), a submersible pump (20) and a gas dispenser (30), and a BOG recovery skid (40). The BOG recovery skid is provided with a recovery skid liquid inlet (41), a recovery skid liquid outlet (42) and a recovery skid gas inlet (43). The recovery skid liquid inlet (41) is connected to the submersible pump outlet (21), the recovery skid liquid outlet (42) is connected to the gas dispenser liquid phase port (31), the recovery skid gas inlet (43) is connected to the gas phase port (11) of the low-temperature storage tank, the gas return port (12) of the low-temperature storage tank is connected to the gas phase port (32) of the gas dispenser, and the liquid phase port (13) of the low-temperature storage tank is connected to the submersible pump inlet (22). The present invention uses a BOG recovery skid with a BOG recovery function, which can reduce BOG emissions, reduce resource waste, and improve the economic benefits of the gas station. The BOG recovery skid is independently configured and installed, and can be easily connected to existing LNG filling station equipment. There is no need to upgrade or modify the original equipment, and it does not affect the operation and control methods of the original system. It is particularly suitable for small LNG filling stations with small gas volumes.

The invention discloses a control method of an LNG (liquefied natural gas) ship isolation void modularized heating structure, which comprises a module frame, a main heater, a standby heater, an auxiliary heater and a heating coil, and is characterized in that the module frame is arranged in a motor chamber which is originally used for placing a compressor motor; the main heater, the standby heater and the auxiliary heater are all fixed on the module frame, the heating coil is fixed in a cabin of the isolation void cabin, and a plurality of temperature sensors are fixed on the front cabin wall and the rear cabin wall of the isolation void cabin. The isolated void modular heating structure is arranged in the compressor motor chamber, the heating coil is arranged in the internal space of the isolated void, and the heating medium conveying pipeline of the isolated void modular heating structure is connected with the heating coil, so that gas in the isolated void can be heated; condensate water is prevented from being formed in the isolation void cabin, material performance reduction caused by low temperature is avoided, and therefore the integrity of the ship structure is guaranteed, and ship navigation safety is guaranteed.

The invention provides a ship liquefied natural gas leakage analysis and personnel evacuation guiding device system and method, and belongs to the technical field of ship safety. According to the ship liquefied natural gas leakage analysis and personnel evacuation guiding method, firstly, whether liquefied natural gas leakage occurs on a ship or not is monitored; if yes, collecting leakage state parameters of liquefied natural gas and current environmental data of a sea area where the ship is located; then different leakage consequence databases are matched according to the leakage state parameters, the environment data and whether the liquefied natural gas is combusted and exploded or not, corresponding leakage consequence conditions are obtained, and finally a safe personnel evacuation route is given to guide personnel in the ship to be evacuated rapidly. And the safety when the liquefied natural gas of the ship leaks is improved.