142 results about "Multistage compressor" patented technology

The invention discloses a compressed air energy storage power station multi-stage compressor start-stop control system and method, and belongs to the technical field of compressed air energy storage, the compressed air energy storage power station multi-stage compressor start-stop control system comprises two compressor units and an expansion unit connected with the compressor units, each compressor unit comprises four stages of compressors connected in series, an anti-surge valve and an emptying valve are arranged on the outlet side of each stage of compressor in parallel, and every two adjacent stages of compressors are connected through a check valve, a butterfly valve shut-off valve, an energy storage heat exchanger and an aftercooler. Meanwhile, an aftercooler, a gas-liquid separator and a gas injection valve are arranged on the outlet side of the last-stage compressor in each compressor unit; the expansion unit and the compressor unit form switchable gas path coupling through an electric shut-off valve. The starting time of the compressed air energy storage system can be shortened, gas in the compressed air energy storage system is prevented from being exhausted during shutdown, and energy loss is reduced.

The invention relates to the technical field of carbon dioxide trapping, in particular to a two-stage rotating wheel adsorption device and method for trapping carbon dioxide in flue gas, the two-stage rotating wheel adsorption device comprises a spray tower, a refrigerating unit, a dehumidification rotating wheel, a carbon trapping rotating wheel, a multi-stage compressor, a refrigerating and liquefying device, a CO2 storage tank and a flue gas fan, the implementation process of the carbon capture device comprises the steps that flue gas is introduced by a flue gas fan, firstly, the flue gas is cooled and dehumidified through a spray tower and a cooler, then the flue gas is dehumidified through a dehumidification rotating wheel, carbon capture is conducted through a carbon capture rotating wheel, and finally high-purity CO2 liquid is conveyed into a CO2 storage tank through a compressor and a refrigeration liquefaction device. The device has the characteristics of low desorption energy consumption, low gas circulation piezoresistance, continuous process and high heat recovery rate, the concentration of enriched CO2 is increased, the concentration of CO2 in flue gas after the carbon capture runner is relatively low, and the unit CO2 capture energy consumption can be greatly reduced while the CO2 removal rate and the enrichment concentration are ensured.

A compression unit for ammonia comprising a multi-stage compressor, including a first set of compressor stages adapted to compress a syngas containing hydrogen and nitrogen; and a second set of compressor stages adapted to compress a refrigerant of a refrigerant circuit. Described herein is also an ammonia production system including the ammonia compression unit and a method.

The invention provides an intelligent performance test method and system for a multistage series Roots vapor compressor. The method comprises the following steps: introducing vapor into equipment to be tested as a test medium; the to-be-tested equipment comprises a control unit, multiple stages of Roots vapor compressors connected in series, an interstage spraying device and a parameter detection unit; the opening degree of each valve in the pipeline valve assembly and the spraying water flow of the inter-stage spraying device are cooperatively controlled through the control unit, so that each stage of compressor in the to-be-tested equipment is stabilized at a preset test working condition point; after the to-be-tested equipment operates stably, acquiring steady-state operation data within a preset duration through a parameter detection unit; calculating a performance evaluation index of the to-be-tested equipment by using the steady-state operation data; the performance evaluation indexes comprise isentropic efficiency and / or volume efficiency of the compressor. The invention further provides a test system for implementing the method. According to the invention, through intelligent automatic control, the performance test of the multi-stage compressor is realized.

A boil-off gas treatment system includes: a first compressor receiving boil-off gas generated from liquefied gas stored in a storage tank of a ship and compressing the boil-off gas; a second compressor compressing boil-off gas received from the storage tank; a heat exchanger cooling the boil-off gas compressed by the first compressor or the second compressor; and a refrigerant circulation line for circulating a refrigerant to the heat exchanger. The first compressor is a multistage compressor including a plurality of compressors and compressing the boil-off gas to a fuel supply pressure required for a propulsion engine. The second compressor compresses the boil-off gas to a fuel supply pressure required for a power generation engine which is lower than the propulsion engine. The boil-off gas compressed by part of the first compressor is supplied to the heat exchanger to be cooled or is supplied to the power generation engine.

The invention discloses an isobaric multi-stage flexible compressed air energy storage system and an operation strategy thereof, relates to the technical field of compressed air energy storage, solves the problems that an air storage device is poor in universality and cannot fundamentally achieve efficient and flexible operation under variable working conditions, and comprises a multi-stage compressor unit, a multi-stage expansion unit and an air storage unit. The multi-stage compressor unit is composed of a first compressor unit, a second compressor unit and a third compressor unit, and the multi-stage expansion unit is composed of a first expansion unit, a second expansion unit and a third expansion unit. Through the isobaric gas storage technology, the non-design working condition caused by the pressure change of the storage tank is eliminated, the compressor and the turbine always work near the optimal pressure ratio, through the multi-machine parallel flexible combination, each device can operate at an efficient point close to the rated power of the device, the low-efficiency problem that a large horse pulls a small trolley in a single large device is avoided, and the working efficiency of the whole device is improved. And the overall efficiency of the system is greatly improved.

The invention discloses a pressurized gas lift reciprocating mixed transportation compressor unit for an oil and gas field, and relates to the technical field of natural gas exploitation, the pressurized gas lift reciprocating mixed transportation compressor unit comprises a compressor assembly, and the compressor assembly is composed of a multi-stage compressor used for achieving pressurization and gas lift and a natural gas engine in transmission connection with the multi-stage compressor; the fuel input end of the natural gas engine is connected with a fuel storage assembly, and the input end of the fuel storage assembly is connected with a shell assembly. An air inlet driving unit is arranged at the top of the shell assembly, and a transposition mechanism is arranged on the outer side of the air inlet driving unit in a transmission mode. Active transposition of the wet natural gas drying units can be periodically achieved, manual operation is not needed, uninterrupted continuous drying treatment of wet natural gas is achieved, meanwhile, in the switching process of the wet natural gas drying units, natural gas cannot enter the working environment, waste is avoided, and meanwhile potential safety hazards are reduced.

The invention belongs to the technical field of ground engineering natural gas gathering, transportation and treatment, and discloses a method for preventing and controlling generation of hydrates in a scattered natural gas recovery process, which comprises the following steps of: transforming a multi-stage compressor in a pressurizing, inflating and storing stage, adopting a frequency conversion fan as an air cooler at a last-stage outlet of the compressor, and adding a temperature controller; the temperature controller automatically and dynamically adjusts the rotating speed of the fan of the last-stage air cooler by comparing the simulated and pre-judged gas hydrate generation temperature with the simulated and pre-judged temperature after gas discharging of the transportation tank is completed, so that the temperature, monitored by the temperature sensor, of the outlet of the compressor is increased; and until the simulated and pre-judged temperature of the transportation tank after gas discharging is higher than the highest temperature of gas hydrate generation, full-process hydrate generation prevention and control are achieved through self-produced heat of the compressor. The multi-stage compressor in the pressurizing, inflating and storing stage is transformed, hydrate generation is prevented and controlled in the whole process through self-heat production of the compressor, and the scattered natural gas is safely and efficiently recycled at low cost.

The present invention relates to a boil-off gas reliquefaction system for a ship. The boil-off gas reliquefaction system for a ship according to the present invention, whereby boil-off gas generated from a liquefied natural gas (LNG) storage tank for a ship is reliquefied, comprises: a first heat exchanger for recovering cold heat from a first boil-off gas generated in the storage tank; a multi-stage compressor for compressing the boil-off gas that has passed through the heat exchanger; a high-pressure gas line for supplying high-pressure gas that is supplied from the multi-stage compressor; a low-pressure gas line for supplying the boil-off gas, which is supplied from the multi-stage compressor, as a low-pressure gas by using a decompression valve; a second heat exchanger in which heat exchange occurs between the high-pressure gas line and the low-pressure gas line downstream of the decompression valve; and a third heat exchanger by which the boil-off gas that has passed through the second heat exchanger is cooled by means of heat medium oil of a cryogenic chiller.

The application provides a compressed air energy storage power generation system based on cascade utilization of photothermal heat compensation and flash evaporation, and relates to the technical field of energy storage power generation. Air is compressed by a multistage compressor through an air compression heat exchange unit, high-pressure air is obtained, heat generated by compressed air is absorbed by low-temperature water, high-temperature water is obtained, an expansion power generation system is used, a multistage expander is used, high-temperature heat conducting oil obtained by the high-temperature water and a photothermal heat collection unit is used to heat input high-pressure gas of each stage of the expander in sequence, power generation is performed, electric energy, exhaust gas of the last stage of the expander, medium-temperature water and low-temperature heat conducting oil are obtained, high-grade energy utilization is realized, heat of the medium-temperature water is converted into electric energy by a flash evaporation power generation system, medium-grade energy utilization is realized, low-grade energy utilization is realized through preheating, the problem that the existing compressed air energy storage power generation system cannot realize cascade utilization of high, medium and low-grade energy is solved, and the application is suitable for energy storage power generation.

The invention discloses refrigeration equipment, a control method and device thereof and a storage medium. The refrigeration equipment comprises a refrigeration system, the refrigeration system comprises a multi-stage compressor, a condenser, a throttling device and an evaporator which are sequentially connected end to end, the multi-stage compressor comprises a plurality of compression modules which are sequentially connected, at least one compression module comprises a compression unit and a cooler, and the cooler is located on the downstream side of the compression unit and communicates with the compression unit; each compression module comprises a compression unit; and the cooling system comprises a cooling flow path, the input end of the cooling flow path is connected to the evaporator and / or the condenser, the output end of the cooling flow path is connected to the cooler, and the cooling flow path is arranged to convey a cooling medium in the evaporator and / or the condenser to the cooler so as to reduce the superheat degree of a refrigerant discharged by the cooler. According to the scheme, the multi-stage compressor can be cooled by using the cooling medium in the system, and an external cooling circulating water system is not needed, so that the miniaturization of refrigeration equipment is facilitated, and the cost is reduced.

This invention is a method for the production and distribution of compressed air in organized industrial zones (OIZs), specifically involving the centralized production of compressed air using energy-efficient turbo compressors and its transmission to industrial facilities via high-pressure conveying lines. The method aims to produce compressed air more efficiently and minimize energy losses during transport, thanks to the low energy consumption and multi-stage compression mechanism of turbo compressors. This method also ensures fair and accurate billing based on the measurement of compressed air consumption supplied to industrial facilities. Each industrial facility is equipped with high-accuracy meters to precisely measure the amount of compressed air consumed. Data from these meters is collected and processed in real time via a central control system. Billing is then based solely on the amount of air consumed. The system aims to reduce operating costs through energy efficiency and low maintenance costs, as well as to ensure environmental sustainability by reducing carbon emissions. The fact that turbo compressors offer lower energy consumption and maintenance requirements compared to screw compressors increases the overall efficiency of this method and provides economic advantages.

The invention provides a liquid phase method methanol synthesis system based on reactive distillation, which comprises the following steps: mixing hydrogen and carbon dioxide into a raw material gas stream, passing through a multi-stage compressor and then passing through a first heat exchanger to obtain a pretreated raw material gas stream; the solvent stream passes through a booster pump and then passes through a second heat exchanger to obtain a pretreated solvent stream; a pretreated raw material gas stream enters the reactive distillation tower from the bottom of the reactive distillation tower, a pretreated solvent stream enters the reactive distillation tower from the top of the reactive distillation tower to obtain a top stream and a bottom stream, the top stream passes through a condenser and then enters a flash tank, a crude methanol stream and an unreacted gas stream are separated, the crude methanol stream enters the distillation tower, and the unreacted gas stream enters the bottom of the distillation tower; a refined methanol product stream and a purge stream are obtained at the top of the rectifying tower, and a solvent and water mixture stream flows out from the bottom of the rectifying tower and is recycled. According to the method, methanol is synthesized through carbon dioxide hydrogenation in the solvent, the reaction conditions are mild, the process is simple, and the high carbon dioxide conversion per pass is achieved.

The application discloses a pipeline structure for multistage compressor series connection, which comprises a first pipe body and a second pipe body connected with each other, a first cavity, a second cavity and a third cavity are sequentially arranged in the first pipe body along the length direction, the cross-sectional dimension of the second cavity is smaller than that of the third cavity; a fourth cavity and a fifth cavity are sequentially arranged in the second pipe body along the length direction, the cross-sectional dimension of the fourth cavity is smaller than that of the third cavity; a valve body is slidably arranged in the third cavity, the length of the valve body is smaller than the depth of the third cavity, and a flow channel communicating with the third cavity and the fourth cavity is arranged in the valve body. The application can automatically increase the pressure of the gas when the pressure of the gas is small, and can automatically make part of the gas directly jump over the pressure increasing stage when the pressure of the gas is large, which is beneficial to optimizing the load distribution and effectively improving the pressure increasing efficiency and the cycle transfer efficiency of the multistage compressor.

The invention relates to the technical field of novel energy, in particular to a method and device for improving energy efficiency of a compressed air energy storage system based on a graph theory, and the method comprises the steps: building a comprehensive energy efficiency index of combined cooling heating and power supply of a target compressed air energy storage system, the target compressed air energy storage system comprises a multi-stage compressor, a multi-stage heat exchanger, a multi-stage heat regenerator, a multi-stage turbine, a heat storage reservoir and a gas storage reservoir; based on the comprehensive energy efficiency index, analyzing the physical process of the target compressed air energy storage system to establish a compressed air energy storage comprehensive energy efficiency analysis model based on a graph theory; the energy efficiency of the target compressed air energy storage system is maximized according to the compressed air energy storage comprehensive energy efficiency analysis model based on the graph theory, so that corresponding operation parameters of the target compressed air energy storage system are obtained. Therefore, the problems that the energy efficiency of current compressed air energy storage is low, and the requirements of a novel electric power system are difficult to meet are solved.

The application discloses a system identification method for mechanical damping of a compressor blade, and the method is as follows: a working condition is determined through steady CFD calculation of a multistage compressor, and is used as an initial field to carry out unsteady CFD calculation; blade modal force amplitude f and phase θ are calculated based on the results of the aerodynamic unsteady calculation and strength finite element analysis; aerodynamic damping under different pitch diameters is calculated by combining the influence coefficient method, and average aerodynamic damping coefficients of aerodynamic damping under all different pitch diameters are calculated; vibration response values of the blade under typical states in the test are measured, and are converted into blade generalized displacement q; the modal force amplitude f, the phase θ, the blade generalized displacement q and the average aerodynamic damping coefficients are brought into a formula to obtain mechanical damping of the blade. Advantageous effects: the real mechanical damping of the blade in a multistage environment is obtained, and based on the obtained mechanical damping, the prediction accuracy and reliability of forced response of the blade in subsequent blade type optimization and blade modification design of derivative types can be effectively improved.

This application relates to the field of large-scale energy storage and integrated energy utilization technology, and in particular to a pre-cooled and heated megawatt-class compressed air energy combined cooling, heating and power system. The system includes: a multi-stage compressor, a multi-stage cooler, a multi-stage heater, a multi-stage expander, a preheater, a hot water tank, a cold water tank, an air storage tank, a high-temperature tank, a chiller, a heater and a low-temperature tank, a high-efficiency heat exchanger, a precooler, a condenser, and control components. It can realize the conversion from electrical energy to compressed air potential energy and then to thermal energy, and vice versa. It can fully utilize the system's own energy and automatically adjust the inlet temperature of the multi-stage compressor according to environmental conditions, enhancing the stability of the system and materials with seasonal changes. Therefore, it solves the problems of high total compression work consumption, large energy loss, poor system thermal storage performance, and low system efficiency in megawatt-class compressed air energy combined cooling, heating and power systems.

The application discloses a flue gas carbon dioxide capturing and conveying integrated system, and relates to the technical field of carbon dioxide capturing.The carbon dioxide capturing and conveying integrated system comprises a pretreatment and absorption module, an integrated processing module, a refining and liquefaction module and an energy management and control module, the pretreatment and absorption module is used for preliminarily treating flue gas and absorbing CO2 in the flue gas, the integrated processing module comprises a multistage compressor unit, a desorption tower and a closed heat pump circulation system, the closed heat pump circulation system is used for transmitting heat generated by the multistage compressor unit to the desorption tower, the refining and liquefaction module is used for refining CO2 gas desorbed and obtaining liquid CO2 used for conveying through liquefaction, and the energy management and control module is used for dynamic regulation and control of each module.The capturing and conveying integrated system can realize integrated, efficient and compact processing from flue gas to conveyable liquid CO2 product through process depth coupling and modular design.

To provide a compressor unit which includes a plurality of stages of compressors and is suitable for compressing hydrogen gas generated by a water electrolysis system.SOLUTION: The compressor unit 10 is used to compress the hydrogen gas generated by the water electrolysis system 25. The compressor unit 10 includes a screw compressor 12 that hydrogen gas containing moisture generated from the water electrolysis system 25, a dryer 14 that is disposed on the downstream side of the screw compressor 12 and dries the hydrogen gas, and a reciprocating compressor 16 that further compresses the hydrogen flowing out from the dryer 14.SELECTED DRAWING: Figure 1

A compression unit for ammonia comprises a multi-stage compressor including a first set of compressor stages adapted to compress a synthesis gas containing hydrogen and nitrogen and a second set of compressor stages adapted to compress a refrigerant of a refrigerant circuit. Also described herein are ammonia production systems and methods including such an ammonia compression unit.

The application discloses a compressed air energy storage-fused salt heat storage comprehensive energy system and an operation method thereof, and belongs to the technical field of energy conversion and energy storage. The system comprises a multi-stage compressor unit, a fused salt-air heat exchanger group, a high-temperature fused salt tank, a low-temperature fused salt tank, a high-pressure gas storage well, an expander, a generator, a regional heat supply heat exchange unit, a heat network circulating pump, a water supplement device and an inter-stage reheating flow channel. The multi-stage compressor unit is connected with the high-pressure gas storage well through the fused salt-air heat exchanger group, and the low-temperature fused salt tank and the high-temperature fused salt tank form a heat storage loop through the fused salt-air heat exchanger group. The outlet of the high-temperature fused salt tank is divided into two paths, one of which is connected with the expander through the inter-stage reheating flow channel, and the other of which is connected with the regional heat supply heat exchange unit to form a closed heating loop. The expander is coaxially connected with the generator, and the air inlet of the expander is connected with the high-pressure gas storage well. The application realizes large-temperature-difference external heat supply while improving the power generation efficiency through high-temperature fused salt heat storage and double-path heat distribution.

This invention proposes a photovoltaic-driven compressed air energy storage system with multi-stage compression and segmented heat recovery. The system includes: photovoltaic modules, a multi-stage compressor unit, a thermal storage heat exchanger, a high-temperature thermal storage tank, a low-temperature thermal storage tank, a regenerative heat exchanger, an expander, and an ORC unit. The photovoltaic modules supply power to the multi-stage compressor unit, which compresses the gas and stores it in the gas storage tank. Part of the heat generated is stored in the high-temperature contact tank and the low-temperature thermal storage tank through two thermal storage heat exchangers. The gas storage tank then feeds the high-pressure gas into the expander for expansion and work, driving a generator to produce electricity. Part of the waste heat from the expander's exhaust gas is fed into the ORC unit for secondary power generation, realizing waste heat utilization. This invention achieves efficient utilization and long-term energy storage of photovoltaic energy, significantly improving energy efficiency and operational safety, and solving the problems of low efficiency, large heat loss, and insufficient regulation capacity in traditional compressed air energy storage systems.

The invention discloses a stable operation method for an air compressor of a PTA (pure terephthalic acid) main device, which belongs to the technical field of chemical production equipment and comprises an air filter for filtering air and a cooling water heat exchanger for cooling and dehumidifying the filtered air. The cooling water heat exchanger is used for cooling air and then providing cooled air for the multi-stage compressor system, the multi-stage compressor system is driven by a steam turbine of a steam turbine, the multi-stage refrigerating machine system is matched with the multi-stage compressor system, and the multi-stage refrigerating machine system is used for carrying out heat extraction and heat exchange on compressed air of the multi-stage compressor system. A heated medium is used as a heat source, so that the multi-stage refrigerator system performs refrigeration cycle, the multi-stage compressor system is used for conveying low-temperature compressed air to the oxidation reactor, the technical problem of high compressor energy consumption caused by air temperature and humidity is solved, and the system is mainly applied to the aspect of hydrogenation reactor air supply.

The present invention belongs to the technical field of air-conditioning compressors, and particularly relates to a multi-stage compressor and an air-conditioning system. In the multi-stage compressor of the present invention, a low-pressure stage compression mechanism and a high-pressure stage compression mechanism are provided; the low-pressure stage compression mechanism adopts a scroll compression mechanism, including a low-pressure stage pressure control mechanism, which can control the compression ratio of the low-pressure stage compression mechanism and the high-pressure stage compression mechanism of the compressor; the high-pressure stage compression mechanism adopts a rotor compression mechanism, including a high-pressure stage pressure control mechanism, which can control the exhaust of the high-pressure stage compression mechanism to be communicated with the exhaust of the low-pressure stage compression mechanism, so that the multi-stage compressor has a first working state in which only the low-pressure stage compression mechanism participates in the compression work and a second working state in which the low-pressure stage compression mechanism and the high-pressure stage compression mechanism jointly participate in the compression work; the technical solution of the present invention solves the problem that the overall energy efficiency of the compressor needs to be improved due to under-compression of the first-stage compression mechanism in the existing multi-stage compressor technology in the prior art.

To provide a system and method for exhaust gas recirculation and injection in a gas turbine.SOLUTION: The system includes a gas turbine system having a gas turbine engine including a compressor, a combustor, and a turbine. The gas turbine system further includes an exhaust gas recirculation (EGR) system configured to recirculate a first portion of an exhaust flow from the gas turbine engine to an air intake of the gas turbine engine. The system further includes an exhaust gas injection system including a multistage compressor including a plurality of stages, wherein the multistage compressor is configured to compress a second portion of the exhaust stream. The exhaust gas injection system further includes an intercooler coupled to the multistage compressor. The exhaust gas injection system is configured to inject a second portion of the exhaust stream into the gas turbine engine at one or more exhaust injection locations other than the air intake to provide power augmentation of the gas turbine engine.SELECTED DRAWING: Figure 1

The invention provides a compressor waste heat utilization system and method, and belongs to the technical field of oil field waste heat recycling, the system comprises a natural gas loop and a produced liquid loop, the natural gas loop comprises a compressor, the compressor comprises multiple stages of compression mechanisms arranged in a stacked mode, and the compressor pressurizes natural gas step by step through the multiple stages of compression mechanisms; the natural gas loop and the produced liquid loop share a plurality of heat exchangers, the heat exchangers in the natural gas loop correspond to the compression mechanisms, the heat exchangers are arranged at the rear ends of the compression mechanisms of the same stage, and natural gas and produced liquid conduct heat interaction through the heat exchangers. The method comprises the steps that the heat exchange process is subjected to analog calculation, step-by-step pressurization is conducted through the compressor, and multi-stage heat exchange is conducted through the heat exchanger. According to the system and the method, interstage compression waste heat utilization can be carried out on the compression mechanism, interstage heat and produced liquid are subjected to heat exchange, produced liquid heating is achieved, the waste heat utilization efficiency is improved, and meanwhile the energy consumption of a natural gas treatment system and the energy consumption of an oil and gas gathering and transportation treatment system are further reduced.

A system includes a gas turbine system having a gas turbine engine including a compressor, a combustor, and a turbine. The gas turbine system further includes an exhaust gas recirculation (EGR) system configured to recirculate a first portion of an exhaust flow from the gas turbine engine to an intake of the gas turbine engine. The gas turbine system further includes an exhaust gas injection system, including a multi-stage compressor including a plurality of stages, wherein the multi-stage compressor is configured to compress a second portion of the exhaust flow. The exhaust gas injection system further includes an intercooler coupled to the multi-stage compressor. The exhaust gas injection system is configured to inject the second portion of the exhaust flow into the gas turbine engine at one or more exhaust injection locations other than the intake to provide power augmentation of the gas turbine engine.

The present application provides a multi-stage compressor for a hydrogen refueling station, which includes a cylinder, a piston rod, a piston, and a power unit. A sealing assembly is provided between the inner wall of the cylinder and the piston. The sealing assembly includes a spiral sealing strip and rubber blocks arranged side by side on both sides of the sealing strip. The rubber blocks arranged on both sides of the sealing strip are staggered. Fixed openings are respectively opened on both sides of the cylinder. The widths of the two fixed openings are equal to the widths of the rubber blocks. The front and rear ends of the sealing strip pass through the fixed openings and exit the cylinder. The portion of the sealing strip inside the cylinder has a spiral structure. The side of the sealing strip away from the cylinder is in close contact with the outer wall of the piston, and the side of the sealing strip close to the cylinder is in close contact with the wall of the cylinder cavity. The present application can effectively block external debris, reduce the situation where external debris enters the interior of the compressor, reduce the adverse effects of external debris on the purity of hydrogen, and reduce safety hazards in the subsequent use of the hydrogen refueling station.