344 results about "LNG storage tank" patented technology

The invention discloses a storage tank pressurization control method and system based on LNG gas station fuzzy self-adaptive PID control, and aims to solve the technical problems that a traditional pressurization control method of an LNG storage tank is low in control precision, poor in stability and rapid in equipment abrasion. According to the control method, dynamic compensation for the target pressure is introduced, so that the system can aim at a more accurate control target in the initial stage, the steady-state control deviation is reduced, and the control precision is improved. And static pressure head change disturbance caused by liquid level change is overcome through dynamic compensation, the adjusting burden of the controller is reduced, the controller can focus on processing other dynamic disturbance, and therefore the control process is more stable, and overshoot is smaller. Through the design of a dynamic compensation mechanism and a special fuzzy rule base, the system can automatically adapt to various complex working conditions, and fast, stable and overshoot-free pressure control is always kept. Therefore, frequent and large-amplitude action and surge phenomena of the valve are avoided, and the energy consumption of an executing mechanism is reduced.

The utility model discloses a BOG liquefaction recovery device of an LNG storage tank. The LNG storage tank is provided with a gas phase opening and a liquid phase opening, and the gas phase opening is formed in the top of the LNG storage tank; the BOG liquefaction recovery device comprises a refrigerating machine, an LNG buffer tank and an LNG pump, the LNG pump is installed in the LNG buffer tank, a liquid phase inlet is formed in the bottom of the LNG buffer tank, the refrigerating machine is provided with a gas phase inlet and a liquid phase outlet, a gas phase opening of the LNG storage tank is connected with the gas phase inlet of the refrigerating machine through a first gas phase pipeline, a first valve is installed on the first gas phase pipeline, and a second valve is installed on the second gas phase pipeline. A liquid phase outlet of the refrigerating machine is connected with a liquid phase inlet of the LNG buffer tank through a first liquid phase pipeline, a second valve is installed on the first liquid phase pipeline, a liquid outlet of the LNG pump is connected with a liquid phase opening of the LNG storage tank through a second liquid phase pipeline, and a third valve is installed on the second liquid phase pipeline. The BOG in the LNG storage tank can be liquefied and recycled, and therefore emission of the BOG in the LNG storage tank is effectively reduced.

The invention provides a ship LNG fuel supply and tail gas carbon dioxide capture system. The ship LNG fuel supply and tail gas carbon dioxide capture system comprises an LNG storage tank, a CO2 separation device, a CO2 compressor, an ejector, an LNG vaporization heater, a mixed gas heat exchanger, a flash tank, a liquid CO2 storage tank, a flue gas heat exchanger and an engine. According to the system, LNG cold energy and engine tail gas heat energy can be effectively utilized, and the energy consumption of the system is reduced.

The invention discloses a pump booster type LNG cold energy utilization system and a control method thereof, the LNG cold energy utilization system comprises an LNG storage tank, a cooler, a gas supply mechanism and a booster pump, the cooler comprises a cooling shell, a first heat dissipation pipe and a second heat dissipation pipe, and the first heat dissipation pipe and the second heat dissipation pipe are arranged in the cooling shell; the gas supply mechanism comprises a vaporizer and a buffer tank, and a third heat dissipation pipe and a fourth heat dissipation pipe are arranged in the vaporizer. The system has the beneficial effects that by arranging the booster pump, the system can effectively suck LNG gas in the buffer tank into the LNG storage tank, so that the pressure in the LNG storage tank is increased, and the pressure in the LNG storage tank can be kept stable when a vehicle runs; meanwhile, according to the system, cold energy is provided for the refrigeration air conditioner through a second heat dissipation pipe in the cooler, recycling of LNG cold energy is achieved, and the energy utilization efficiency of the whole system is improved.

The utility model relates to a coupling energy supply system based on LNG and a fuel cell, a gas supply unit comprises an LNG storage tank and an LNG vaporizer which are connected through an LNG pipeline, the LNG vaporizer is connected with a downstream gas pipeline through a gas supply pipeline, a power generation unit comprises a cooling heat exchanger and the fuel cell, a cooling loop is arranged between the secondary side of the cooling heat exchanger and the fuel cell, and the fuel cell is connected with the cooling loop. A primary side inlet of the cooling heat exchanger is connected with the LNG storage tank through a BOG pipeline, a primary side outlet of the cooling heat exchanger is connected with a gas inlet of the fuel cell through a fuel pipeline, electric energy generated by the fuel cell is merged into a user electric power internal network, and the system has the advantages of being good in stability and high in safety.

The utility model provides an efficient depressurization device for an LNG storage tank, and relates to the technical field of LNG storage tanks, the efficient depressurization device for the LNG storage tank comprises a tank body, a supporting structure is arranged below the tank body, the tank body extends in the horizontal direction, pressure gauges are arranged at the two ends of the tank body respectively, a connecting pipe is fixedly arranged above the tank body, and the upper end of the connecting pipe is connected with a depressurization pipe; the upper end of the condensation pipe is connected with an input pipe, and the lower end of the condensation pipe is connected with an output pipe; a connecting pipe is arranged in the connecting pipe, a pressure reducing pipe is arranged in the connecting pipe, a through pipe is arranged below the pressure reducing pipe, the through pipe is inserted into the connecting pipe to connect the pressure reducing pipe and the connecting pipe, a control valve is arranged in the connecting pipe, and a sealing ring is arranged between the control valve and the through pipe. Pollution caused by interaction of gas and air in the storage tank is avoided, and by arranging a positioning column and a dismounting assembly, the depressurization pipe is convenient to dismount.

The utility model relates to the field of natural gas dehydration, and discloses a natural gas cold energy dehumidification system which comprises a dehumidification structure and a water storage buffer tank, a flow meter is arranged on a gas inlet pipe of a high-pressure natural gas pipeline, the dehumidification structure comprises a dehumidification box body communicated with the high-pressure natural gas pipeline, and a heat exchange pipeline is arranged in the dehumidification box body. Low-temperature flash steam circulates in the heat exchange pipeline, a flow control valve used for controlling the flow of the low-temperature flash steam is arranged on the heat exchange pipeline, the bottom of the dehumidification box communicates with a water storage buffer tank through a pipeline, and a drainage valve is arranged at the bottom of the water storage buffer tank. Natural gas in the high-pressure natural gas conveying pipeline is cooled through low-temperature flash steam guided out of the LNG storage tank, so that water vapor mixed in the natural gas is liquefied when meeting cold, collected condensate water is discharged in time, the dehumidification system can continuously and automatically work, the water vapor content in the natural gas is reduced, and the energy consumption is reduced. The dehumidification device has the advantages of simple structure, low cost and excellent dehumidification effect.

The invention discloses an LNG anti-tumbling prediction method and device based on a GA-BP neural network algorithm, and the method comprises the steps: carrying out the simulation based on an LNG storage tank two-dimensional model, obtaining the size, diameter, initial density difference and critical density difference corresponding to the layering height of different storage tanks, and constructing a tumbling process data set; establishing an LNG storage tank rolling prediction model based on a GA-BP neural network algorithm, and training the LNG storage tank rolling prediction model by adopting the training set; the optimized and trained LNG storage tank rolling prediction model is adopted for rolling prediction, and the critical density difference is calculated according to the input values of the storage tank volume, diameter, initial density difference and layering height so as to judge whether the LNG storage tank is about to roll or not. The method can be used for predicting the critical density difference of the LNG storage tank so as to ensure safe operation of the LNG storage tank.

The invention discloses a gas cylinder heating and pressurizing and LNG cold energy utilization system and a control method thereof.The system comprises an LNG storage tank, a cooler, a gas supply mechanism and a booster pump, the cooler comprises a cooling shell, a first cooling pipe and a second cooling pipe, and the first cooling pipe and the second cooling pipe are arranged in the cooling shell; the gas supply mechanism comprises a vaporizer and a buffer tank, and a third heat dissipation pipe, a fourth heat dissipation pipe and a fifth heat dissipation pipe are arranged in the vaporizer. The system has the beneficial effects that by arranging the heat exchange channel and the booster pump, the temperature of low-temperature LNG in the LNG storage tank can be effectively increased, and then the gasification process of the low-temperature LNG is accelerated. The pressure in the LNG storage tank is always kept at the LNG saturation pressure, so that the pressure in the LNG storage tank can be always kept stable even if a vehicle runs; and meanwhile, the system provides cold energy for the refrigeration air conditioner through the second heat dissipation pipe in the cooler, cold energy recycling is achieved, and the energy utilization efficiency of the whole system is improved.

A liquefied natural gas (LNG) production facility includes gravity-based structures (GBSs) with process lines for liquefying natural gas. A GBS contains: tanks for each component of a mixed refrigerant, wherein a GBS process line includes a fractionating apparatus for mixed refrigerant component production from a broad fraction of light hydrocarbons; a stabilized gas condensate (SGC) storage tank; and a berth for offloading LNG and SGC into tankers. Each GBS contains an LNG storage tank. One tank per mixed refrigerant component from each GBS is connected by pipe to systems for preparing and compressing all process line refrigerants, thus forming a common component feed system. The SGC storage tank is connected by pipes to condensate-stabilizing apparatus for all process lines, thus forming a common system for storing and offloading SGC. The LNG storage tanks are interconnected by pipes, forming a common system for storing and offloading LNG.

The invention discloses an oversize LNG storage tank mixed medium precooling dynamic regulation and control system and method, and relates to the technical field of LNG storage tank precooling, and the system comprises a precooling medium supply module for providing two or more precooling media; the pre-cooling spraying distribution pipe network is arranged at the top of the inner tank of the LNG storage tank and is used for uniformly spraying a pre-cooling medium into the storage tank; the pre-cooling process control module is used for sequentially controlling the switching, proportioning and conveying rate of liquid nitrogen and LNG according to a preset stage; the thermal stress control and temperature difference balance subsystem is used for monitoring and adjusting the temperature difference of each area in the storage tank; the boil-off gas recovery module is used for collecting and treating natural gas boil-off gas caused by temperature drop in the pre-cooling process; the pre-cooling pre-safety control unit is used for executing air tightness detection, replacement, drying and cold brittleness pre-judgment operation before pre-cooling; a liquid nitrogen and LNG mixed medium pre-cooling scheme is adopted, and more efficient temperature reduction speed and uniformity can be achieved.

The invention discloses a hydrogen liquefaction, liquid hydrogen storage and transportation and LNG receiving station integrated design system and method based on cold energy utilization, and belongs to the technical field of hydrogen liquefaction treatment systems. The system comprises an LNG receiving station, a hydrogen liquefaction treatment system and a liquid hydrogen storage and transportation system. The LNG receiving station comprises an LNG storage tank and a BOG condensation unit, and the BOG condensation unit condenses NG generated in the LNG storage tank into LNG through low-temperature hydrogen generated by the liquid hydrogen storage and transportation system. The hydrogen liquefaction treatment system precools hydrogen through LNG gasification cold energy in the LNG receiving station and the nitrogen refrigeration cycle system, and the nitrogen refrigeration cycle system cools nitrogen through the LNG gasification cold energy. According to the system and method, a large amount of LNG gasification cold energy in the LNG receiving station is fully utilized to achieve hydrogen liquefaction, meanwhile, low-temperature hydrogen generated in the liquid hydrogen storage and transportation system is fully utilized to achieve NG condensation, and therefore LNG and hydrogen energy industry chain optimization matching is achieved, and the investment and operation cost of the LNG receiving station, hydrogen liquefaction and liquid hydrogen storage and transportation factories is reduced.

The invention relates to a high-Ni alloy flux-cored wire for 9% Ni steel welding, which is prepared by coating a flux core with a nickel-based steel strip, and the flux core comprises the following components in percentage by weight: 18.0-30.0% of metal nickel powder, 5.0-8.0% of metal chromium powder, 5.0-9.0% of metal molybdenum powder, 1-2% of metal tungsten powder, 20.0-30.0% of rutile, 1.0-3.0% of quartz, 2.0-5.0% of albite, 1.0-3.0% of potassium feldspar, 0.5-3.0% of mica, 1.0-4.0% of cryolite, 0.2-0.8% of self-made raw material and the balance of reduced iron powder and inevitable impurities. The flux-cored wire belongs to a hastelloy system and is particularly suitable for welding of horizontal position welding and vertical position welding of the marine LNG storage tank, the mechanical performance of cladding metal of the flux-cored wire can reach 50 J or above at the low-temperature impact of-196 DEG C, the tensile strength is larger than 700 MPa, and the flux-cored wire is excellent in crack resistance and comprehensive performance.

The present invention provides a gear-driven rotational amplification type anti-sloshing apparatus. The gear-driven rotational amplification type anti-sloshing apparatus is disposed within a tank body of an LNG storage tank and positioned at an upper portion thereof, and comprises: a composite disc, a wheel set, an outer sleeve, an outward-extending fan blade, a ball screw, a spring, and a slosh baffle plate; the composite disc is connected to the slosh baffle plate below the composite disc by means of the spring, the composite disc being fixed to an upper portion of an inner wall surface of the tank body of the LNG storage tank, the slosh baffle plate abutting the inner wall surface of the tank body of the LNG storage tank without being fixedly connected thereto, and the wheel set, the outer sleeve, the outward-extending fan blades, and the ball screw being arranged between the composite disc and the slosh baffle plate, and all being located below a liquid level in the LNG storage tank. When an earthquake occurs, the anti-sloshing apparatus of the present invention utilizes the rotational amplification effect thereof to efficiently dissipate energy, thereby reducing the impact of the earthquake on the structure of large LNG storage tanks, and improving the safety of said LNG storage tank structure.

The utility model relates to a liquefied natural gas storage tank precooling mixed gas separation device in the technical field of gas separation. The liquefied natural gas storage tank precooling mixed gas separation device comprises a gas-liquid conveying system, a hydrate generation system, a cooling heat exchange system, a hydrate decomposition system, a separation and collection system and a data monitoring and collection system. The nano-bubble generator and the folded tubular reactor work cooperatively, nano-bubbles can be kept stable in a liquid carrier for a long time, high suction capacity and high generation efficiency can be guaranteed, natural gas and nitrogen mixed gas generated in the precooling process of the LNG storage tank is recycled at high efficiency and low cost, energy input is reduced, cost is reduced, and the production efficiency is improved. The resource waste is reduced, and the environmental pollution is reduced.

The invention discloses a method for determining the storage capacity of each storage tank of a receiving station and a related device. The method comprises the following steps: acquiring density and volume information of LNG of a coming ship; information of the lowest liquid level, the highest liquid level and the current density of each storage tank used for loading and unloading the LNG of the coming ship is obtained; according to the record information of the LNG ship, the attribute information of each storage tank and a preset LNG sub-tank storage strategy, the LNG storage amount of each storage tank is determined; the LNG sub-tank storage strategy is used for enabling the storage amount of each storage tank to at least meet a preset density change condition before and after each storage tank stores the LNG of the coming ship. According to the LNG storage tank, the LNG incoming materials can be effectively prevented from being layered in the storage tanks, rolling caused by external influence during subsequent storage and mechanical damage or larger accident disasters of the storage tanks are avoided, and the LNG storage tank has scientific and feasible guiding significance.

A storage tank internal liquid phase physical property field and layering prediction method comprises the steps that radial and axial gridding rules of an LNG storage tank model are formulated, historical data are collected to correct a preset model so as to generate a dynamic temperature initial value, temperature distribution models of a first layer and a last layer are constructed, the axial temperature of a storage tank is corrected, a boundary layer temperature distribution model is constructed, and then the storage tank internal liquid phase physical property field is obtained. The method comprises the following steps: correcting the radial temperature of a storage tank, collecting field actual measurement data, carrying out parameter estimation of a preset model through a least square method, calculating a temperature field, converting the temperature field into a physical property field, carrying out layering coefficient characterization, and finally constructing an interlayer dynamic interaction model to predict the dynamic temperature, composition and layering trend of each layer in the future. According to the method, through axial-radial grid modeling and a dynamic calibration mechanism, the layering prediction efficiency is remarkably improved, the physical property distribution change in the tank can be accurately captured, and safe operation of the storage tank is effectively guided.

This application relates to the field of LNG cryogenic pressure vessel welding technology, specifically disclosing a multi-level collaborative control method for magnetic blow in 7Ni steel welding based on a quantified remanent magnetization threshold. Addressing the problems of severe magnetic blow and poor all-position welding stability caused by the high permeability, high coercivity, and difficulty in demagnetizing 7Ni steel, the method uses a remanent magnetization threshold of ≤50Gs to construct a collaborative control system encompassing pre-welding quantitative management, welding polarity and ground wire optimization, welding parameter and sequence constraints, real-time monitoring and automatic demagnetization closed-loop during welding, and post-weld quality verification. This application can effectively suppress all-position magnetic blow, avoiding defects such as arc deviation, incomplete penetration, slag inclusion, and porosity; achieving a first-pass yield of ≥97.5% for the main weld of the LNG storage tank, with a joint impact energy of ≥80J at -196℃ and a hardness of ≤300HV10, meeting cryogenic service specifications and applicable to the industrial welding production of large 7Ni steel LNG storage tanks.

The invention discloses an LNG tank car residual gas recovery device which comprises a skid-mounted base, a shell is fixedly connected to the top of the skid-mounted base, a tank car connecting pipe is arranged on one side of the shell, a storage tank connecting pipe is arranged on the side, located on the tank car connecting pipe, of the shell, a controller is arranged on one side of the front face of the shell, and the LNG tank car residual gas recovery device further comprises a BOG recovery assembly. Wherein the sheet bar is supported through the supporting device. The invention relates to the technical field of LNG tank car residual gas recovery, BOG gas is pumped out of an LNG tank car through a BOG recovery assembly and compressed, the temperature of the BOG gas is adjusted through a temperature control assembly, the conveying pressure of the BOG gas is automatically adjusted, the gas state of the BOG residual gas is converted into liquid LNG, the liquid LNG is conveyed into an LNG storage tank, and recovery of the BOG residual gas in the LNG tank car is achieved. The recovery efficiency of the BOG residual gas is improved, resource waste and existing potential risks caused by direct emission of the residual gas are avoided, and emission of greenhouse gas and economic losses in the LNG transportation and transfer process are reduced.

The present invention relates to a soft soil foundation settlement control device for an external natural gas pipeline, which is mainly composed of an LNG storage tank, an infusion pump, a liquid inlet pipe, a liquid return pipe, a vaporizer, a connecting pipe, a signal monitoring terminal, and a monitoring computer. Low-temperature LNG liquid returns to the vaporizer after passing through the liquid inlet pipe and the liquid return pipe. A number of connecting pipes are arranged between the liquid inlet pipe and the liquid return pipe. The three connecting pipes are laid under the external natural gas pipeline. By inputting cold energy into the surrounding soft soil foundation, the formation shape is frozen. By real-time monitoring of the soil temperature, the amount of cold energy can be adjusted, thereby achieving effective control of the formation settlement. The present invention uses the cold energy of LNG itself to control the settlement of the soft soil foundation, does not consume additional cold energy, and has broad application prospects.

To provide an energy storage system that liquefies air and storing it as energy capable of being converted into electricity, efficiently improves power generation efficiency, and easily recovers carbon dioxide from exhaust gas.SOLUTION: An energy storage system according to the present invention comprises: an LNG storage tank 10; an LNG pump 20; a power generation unit 120 that generates power using vaporized LNG gas and / or evaporated LNG gas as fuel; a cryogenic separation unit 50 that separates and extracts nitrogen and oxygen as liquid; a cryogenic separation heat exchanger 60 that supplies cold heat of the LNG to the cryogenic separation unit 50; a high-temperature oxygen heat exchanger 100; an oxygen expansion turbine 110 that expands the evaporated oxygen to generate power; an exhaust gas circulation line 187 that circulates exhaust gas of the power generation unit 120 to the intake air of the power generation unit 120, and supplies exhaust heat to the high-temperature oxygen heat exchanger 100; and an oxygen gas confluence line 188 that confluences a portion of the oxygen gas at an outlet of the oxygen expansion turbine 110 with the exhaust gas circulation line 187.SELECTED DRAWING: Figure 1

The application discloses an energy-saving system suitable for coupling LNG cold energy power generation and ORC power generation, and belongs to the fields of ship engineering and energy saving. The LNG cold energy power generation system comprises an LNG storage tank (1), an LNG pump (11), an LNG evaporator (10), an LNG turbine generator (9), an NG reheater (7), a gas supply buffer tank (12) and the like. The application utilizes both LNG cold energy power generation and flue gas waste heat organic Rankine cycle (ORC) power generation, and the two are combined with each other. The cold energy released by LNG gasification is used for organic medium condensation, and the heat of the ORC evaporator comes from flue gas waste heat or cylinder jacket water. After LNG power generation, the LNG is reheated to a proper temperature to supply gas to the main engine, and the cold energy in the reheating process is used for organic medium condensation. The organic medium condensation process is completed in two condensers. A gas-liquid separator is arranged between the two condensers to reduce two-phase flow in the system and inhibit the negative influence of the sloshing working condition on the system during ship sailing.

The invention discloses 5.5 Ni steel with excellent ultralow-temperature impact toughness as well as a preparation method and application of the 5.5 Ni steel. The 5.5 Ni steel is prepared from chemical components in percentage by mass as follows: 0.04%-0.1% of C, 0.04%-0.15% of Si, 0.5%-1.5% of Mn, 5.0%-6.0% of Ni, 0.2%-0.3% of Mo and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: smelting; carrying out thermal mechanical treatment; and carrying out heat treatment by a quenching-two-phase region quenching-tempering process. According to the 5.5 Ni steel provided by the invention, only a certain mass fraction of Mo element is added, so that the problem of insufficient hardenability and strength caused by reduction of Ni element is solved, and the problem of low low-temperature toughness when the 5.5 Ni steel replaces 9Ni steel is solved through a QLT heat treatment process of thermal mechanical treatment and a quenching-two-phase region quenching-tempering process; the impact absorbing energy of the 5.5 Ni steel at the temperature of-196 DEG C reaches 250 J or above, the yield strength at the room temperature is larger than 580 MPa, and the requirements for strength and low-temperature toughness of the steel for the LNG storage tank are met.

The invention provides a zero-emission power circulation and fuel gas supply system and method for an LNG power-driven ship. The system comprises an internal combustion engine, a nitrogen membrane separation device, a heat regenerator, a water separator, a liquid CO2 storage tank, a liquid oxygen pump, an LNG pump, an LNG storage tank, a liquid oxygen storage tank, a CO2 condenser, a circulation compressor, a gas buffer tank, a CO2 separator, a first-stage water cooler and a second-stage intermediate heat exchanger. According to the internal combustion engine, LNG serves as fuel, an argon and oxygen mixture serves as a circulating working medium to replace air and natural gas to be combusted and push a piston to move, water vapor and gas CO2 in waste gas generated by the internal combustion engine are condensed and separated after being subjected to stepped cooling, and CO2 is liquefied through a circulating compressor and recycled to a liquid CO2 storage tank. According to the invention, argon is used for replacing air to realize waste heat recovery of the internal combustion engine, so that the energy efficiency of the system is improved, and meanwhile, CO2 capture and zero emission of gaseous pollutants are realized.

The application discloses a nickel-based flux-cored wire for LNG storage tanks and a preparation method and application thereof, and belongs to the technical field of welding material flux-cored wires, and solves the problem that the mechanical properties and toughness of a weld after welding of an existing welding wire used for welding 9Ni steel plates are not matched with the 9Ni steel, thereby leading to low service life of the storage tank. The nickel-based flux-cored wire comprises a core and a cladding layer cladded outside the core; the cladding layer comprises, in percentage by mass, C: 0.015%, Cr: 14.5%-20.0%, S: 0.04%, P: 0.04%, and the balance of Ni and inevitable impurities; and the core comprises, in percentage by mass, Co: 0.5%-2.5%, Cr: 13.0%-18.0%, Si: 0.15%, Al: 0.01%-0.03%, Mn: 0.001%-0.02%, Mo: 15%-17%, W: 10%-20%, Fe: 10%-15%, and the balance of Ni and inevitable impurities.

The application discloses a LNG storage tank radar liquid level temperature compensation method and system based on gas phase temperature distribution, a medium and a program product, and relates to the technical field of liquid level measurement. In view of the problem that the measurement error is caused by regarding the electromagnetic wave propagation speed as a constant in the existing radar liquid level measurement, a gas phase temperature distribution model along the height direction is established, the electromagnetic wave propagation speed in the gas phase is dynamically corrected by combining the gas state equation and the electromagnetic wave propagation theory, and the propagation time is calculated by path integration, so that the inversion calculation of the liquid level height is realized. The application utilizes the liquid phase temperature stability and the gas phase top temperature measurement value to construct a gas phase temperature distribution function, further calculates the gas density, the dielectric constant and the propagation speed, and realizes the compensation of the liquid level measurement result. Simulation and actual rapid liquid discharge working condition verification show that the method can effectively reduce the liquid level measurement error, improve the measurement accuracy and reliability, and is suitable for the liquid level measurement scene of low-temperature storage tanks such as liquefied natural gas.

The invention belongs to the technical field of liquefied natural gas (LNG) storage tanks, and particularly relates to a flow blocking element for a corrugated plate of an LNG storage tank. The LNG storage tank comprises an insulation box and the corrugated plate arranged on the outer layer of the insulation box; the corrugated plate is provided with strip-shaped ridge parts facing the insulation box, a cavity is defined by the adjacent strip-shaped ridge parts and the surface of the insulation box, the flow choking element is arranged in the strip-shaped cavity defined by the adjacent strip-shaped ridge parts and the surface of the insulation box, and the flow choking element is provided with a nonlinear gas channel used for prolonging gas convection and / or increasing gas flow resistance. By arranging the nonlinear gas channel, when gas flows in the cavity, the path is prolonged, the resistance is increased, natural convection is effectively inhibited, the cooling capacity loss is reduced, and the evaporation rate (BOR) can be predicted to be reduced by 5%-10%. The system is diversified in structural form, high in adaptability, high in installation reliability, good in compatibility with an existing system and controllable in cost.

The application discloses a zero-carbon high-temperature reversible fuel cell energy supply / storage system for an LNG receiving station. The energy supply / storage system has the following structure: a natural gas inlet of a natural gas reforming device is connected with an LNG storage tank, a product outlet is connected with an anode of a high-temperature reversible fuel cell power generation energy supply device, a cathode is connected with an oxygen / air inlet pipeline; a raw material inlet of a high-temperature reversible fuel cell electrolysis energy storage device is connected with a tail gas discharge pipeline of the high-temperature reversible fuel cell power generation energy supply device, a product gas outlet is connected with the anode of the high-temperature reversible fuel cell power generation energy supply device; the high-temperature reversible fuel cell electrolysis energy storage device is powered by offshore wind power; the high-temperature reversible fuel cell power generation energy supply device supplies power for the LNG receiving station; and heat of the system comes from waste heat generated by the high-temperature reversible fuel cell power generation energy supply device. The application makes full use of the heat energy by-produced by the high-temperature reversible fuel cell power generation energy supply device, realizes dynamic balance of heat demand of the system, and greatly improves energy utilization rate of the system.

The present invention relates to the technical field of refrigerator vehicles, and provides a cold-energy utilization system and a refrigerator vehicle. The cold-energy utilization system is used in the refrigerator vehicle, on which a refrigerated compartment and an engine are provided. The cold-energy utilization system comprises an LNG storage tank, a refrigerant storage tank, a first heat exchanger, a second heat exchanger, and a natural-gas buffer tank, wherein the LNG storage tank is connected to a refrigerant inlet of the first heat exchanger, a refrigerant outlet of the first heat exchanger is connected to a refrigerant inlet of the second heat exchanger, and a refrigerant outlet of the second heat exchanger is connected to the natural-gas buffer tank; the refrigerant storage tank is connected to both a heating medium inlet and a heating medium outlet of the first heat exchanger, and a refrigerant in the refrigerant storage tank is used for absorbing the cold of an LNG circulating in the first heat exchanger and releasing the absorbed cold into the refrigerated compartment; and a cooling water system of the engine is connected to both a heating medium inlet and a heat medium outlet of the second heat exchanger. In the cold-energy utilization system, gradient utilization of LNG cold energy is achieved, eliminating the need for fuel- or gas-powered mechanical refrigeration to cool the compartment, thereby reducing the costs.

The utility model discloses a gas chamber platform escape tower of a C-shaped LNG (Liquefied Natural Gas) storage tank, relates to the technical field of ship LNG storage tank parts, and solves the problems that a plurality of long inclined ladders and platforms are usually required to be moved from a gas chamber platform at the top of the C-shaped LNG storage tank to an upper deck, only one safety channel is provided, and the escape probability of sailors on the gas chamber platform is low. Comprising a tank body base and a truss main body, a C-shaped LNG tank is supported above the tank body base, the lower end of the truss main body is connected to an upper deck, a vertically-arranged straight ladder assembly is connected in the truss main body, a platform support and an inclined ladder support are connected above the C-shaped LNG tank, a horizontal gas chamber platform is connected above the platform support, and a top inclined ladder is connected to the upper side of the inclined ladder support. The upper and lower ends of the top inclined ladder are respectively positioned between the air chamber platform and the straight ladder structure. In order to improve the escape probability, a standby escape channel is added, escape is directly completed from the gas chamber platform along the top inclined ladder and the vertical ladder assembly outside the C-shaped LNG tank, and the effect of improving safety is achieved.