2965 results about "Inlet pressure" patented technology

A method for separating a hydrogen-rich product stream from a feed stream comprising hydrogen and at least one carbon-containing gas, comprising feeding the feed stream, at an inlet pressure greater than atmospheric pressure and a temperature greater than 200° C., to a hydrogen separation membrane system comprising a membrane that is selectively permeable to hydrogen, and producing a hydrogen-rich permeate product stream on the permeate side of the membrane and a carbon dioxide-rich product raffinate stream on the raffinate side of the membrane. A method for separating a hydrogen-rich product stream from a feed stream comprising hydrogen and at least one carbon-containing gas, comprising feeding the feed stream, at an inlet pressure greater than atmospheric pressure and a temperature greater than 200° C., to an integrated water gas shift/hydrogen separation membrane system wherein the hydrogen separation membrane system comprises a membrane that is selectively permeable to hydrogen, and producing a hydrogen-rich permeate product stream on the permeate side of the membrane and a carbon dioxide-rich product raffinate stream on the raffinate side of the membrane. A method for pretreating a membrane, comprising: heating the membrane to a desired operating temperature and desired feed pressure in a flow of inert gas for a sufficient time to cause the membrane to mechanically deform; decreasing the feed pressure to approximately ambient pressure; and optionally, flowing an oxidizing agent across the membrane before, during, or after deformation of the membrane. A method of supporting a hydrogen separation membrane system comprising selecting a hydrogen separation membrane system comprising one or more catalyst outer layers deposited on a hydrogen transport membrane layer and sealing the hydrogen separation membrane system to a porous support.

An improved ambulatory infusion device for dispensing a fluid into a patient includes a flexible bladder enclosure having a first open end a closed second end. The closed second end of the sheath is free to conform to the body of the patient so that the device is comfortable when worn. In other aspects, a pressure regulator of the device is adapted to maintain the outlet pressure within a predetermined range of pressures so that the fluid flow rate is substantially constant during fluid flow. A flow restrictor of the device is formed of flexible tubing.

An ambulatory infusion device for dispensing a fluid at a predetermined fluid flow rate includes an elastic bladder having an interior volume for storing the fluid under pressure and an opening for dispensing the fluid. A pressure regulator is in fluid communication with the opening of the bladder and includes an inlet for receiving fluid from the bladder at an inlet pressure and an outlet for discharging the fluid at a predetermined outlet pressure. A valve at the inlet has a hemispheric-shaped head adapted to cooperate with a frustoconic-shaped seat to promote uniform fluid flow therebetween. A movable diaphragm is connected to the valve, and a valve plate opposite a surface of the diaphragm has channels or texture therein. The diaphragm and the valve are movable in response to the fluid pressure acting on the diaphragm surface.

A method for determining a target exhaust temperature for a gas turbine including: determining a target exhaust temperature based on a compressor pressure condition; determining a temperature adjustment to the target exhaust temperature based on at least one parameter of a group of parameters consisting of specific humidity, compressor inlet pressure loss and turbine exhaust back pressure; and adjusting the target exhaust temperature by applying the temperature adjustment.

A system and method of surge limit control for turbo compressors including a turbo compressor having an inlet and an outlet, an anti-surge valve, a variable speed drive to operate the compressor, a rotational speed transmitter, an inlet temperature transmitter, an inlet pressure transmitter, an outlet pressure transmitter and/or guide vanes, and a controller, the controller including a PID control module wherein the computer uses information from the transmitters to continuously calculate a pressure ratio of the compressor at the compressor's current operational speed and compare it to the compressor's calculated pressure ratio at surge limit conditions. A computer generates a control signal for determining when to open the anti-surge valve if the pressure ratio of the compressor at the compressor's current operational speed guide vanes are within a user defined safety margin to the calculated pressure ratio at surge limit conditions.

The invention provides a simple and effective thermal management system of a water-cooling proton exchange membrane fuel cell and a control method of the thermal management system. The thermal management system mainly comprises an electric pile, a water tank provided with a heating device, a cooling water circulating pump, a radiator, a cooling water pile inlet temperature sensor, a cooling water pile outlet temperature sensor, a cooling water pile inlet pressure sensor and a controller of the thermal management system. The control method following pressure change is provided to overcome the defects of lag, great overshooting, system coupling and the like caused by temperature change tracking in the traditional control strategy. The radiator is mainly used for controlling the cooling water inlet temperature of the pile and mainly controls the rotating speed of a radiator fan according to the cooling water inlet temperature of the pile of the fuel cell; and the cooling water circulating pump is mainly used for controlling the cooling water flow in the whole thermal management system and mainly controls the rotating speed of the circulating pump according to the cooling water inlet pressure of the pile of the fuel cell.

The invention discloses a compressed air energy storage system, which comprises a compressor unit, a pre-expansion device, a turbine expansion machine, an intermediate cooler, an electric motor, a power generator, a hot water storage tank and a cold water storage tank, wherein the system utilizes electric energy which is not used up in the user electricity consumption valley period or wind power station power generation peak period for driving the compressor unit to work, the air at the normal pressure is compressed to high pressure, in addition, the part of air with rich pressure energy is stored into a high-pressure-resistance hole, in addition, the stored high-pressure air is released in the user electric consumption peak period or the wind power field generation valley period, an expansion unit is pushed to apply work, and the electric energy is output. The air pre-expansion device is additionally arranged at an outlet of an air storage chamber, so the air inlet pressure of the air turbine expansion machine is stable, the work stability of a power generation system is enhanced, low-temperature air at an outlet of the pre-expansion device is utilized for cooling hot water from the hot water storage tank, the temperature of the low-temperature air is raised through absorption of heat from the hot water, and the cooled water enters the cold water storage tank. The compressed air energy storage system is provided with the hot water storage tank and the cold water storage tank, the water is cyclically utilized in a closed loop, the water is not consumed, in addition, the heat discharged by the compressor is fully utilized and conveyed back to the high-pressure air at the outlet of the pre-expansion device. The high-pressure air at the outlet of the pre-expansion device is recovered through a heat recovering device (HRH).

The invention discloses an aeroengine fuel system altitude performance testing unit and a test method thereof. The testing unit comprises an equipment cabinet, a control computer, a display instrument, a high altitude box, a fuel tank, an oil pipeline, a vacuum pump package and various valves, wherein, the inner part of the high altitude box is provided with a testing oil fuel pump which is connected with the fuel tank through the oil pipeline inside the equipment cabinet, the fuel tank has a structure with low temperature resistance and atmospheric depression resistance, can simulate the high altitude working environment of the fuel system of the aeroengine. The test method utilizes the fuel tank capable of simulating the atmospheric depression and the low temperature of the high altitude and a high altitude box capable of simulating the atmospheric depression, adopts the pipeline and the valves to adjust the oil inlet pressure and the oil return pressure, and uses a flowmeter, a thermometer and a pressure gauge to read the parameter values. The test of altitude simulations of an oil supply system of an electronic oil fuel pump of an aircraft piston engine can be performed by the method.

A pilot operated pressure valve which limits the rate of pressure rise and substantially eliminates excessive system pressure spikes, the valve including an inlet, a hollow cylindrical main body sealingly connected at one end thereof to the inlet, a pilot chamber having a sleeve slidably mounted within the main body and an operating pressure adjustment connected to another end of the main body adjacent another end of the pilot chamber for varying the operating pressure of the valve. A main chamber receives pressurized fluid metered through a main orifice and discharges pressurized fluid through a damping orifice when the main chamber is filled and fluid inlet pressure exceeds a preselected inlet pressure level sufficient to open a spring biased pilot ball downstream of the damping orifice. The inlet will open an exit port upstream of the main orifice for discharging pressurized fluid from the valve back to a supply tank when inlet pressure exceeds the operating pressure. Pressurized fluid is also metered from the pilot chamber through a control orifice into a loading chamber to automatically further vary the operating pressure of the valve by including a relief valve for discharging pressurized fluid from said pilot chamber when fluid pressure exceeds the operating pressure.

A variable air exhaust through flow area air inlet pressure control type adjusting device for a turbocharged engine belongs to the technical field of mechanical design and comprises an air compressor, an engine, a turbine, a volume cavity, a rotation body, a spring, a rotation rod, a rotation shaft and a rotation plate. The longitudinal sections of the volume cavity and the rotation body are both in arc shapes, the rotation plate is installed in an air exhaust pipe, the rotation plate and the rotation shaft are fixed together, the left wall of the rotation body is connected with the left wall of the volume cavity through the spring, and two ends of the connection pipe are respectively communicated with the right wall of the volume cavity and an air inlet pipe of the engine. When pressure in the air inlet pipe of the engine is high, the rotation body drives the rotation plate to rotate in a counterclockwise mode, pumping loss of the engine is small, and the whole performance is excellent. When pressure in the air inlet pipe of the engine is low, the rotation body drives the rotation plate to rotate in a clockwise mode, available energy in front of the turbine is more, air inlet pressure of the engine is high, and the whole performance is excellent. The variable air exhaust through flow area air inlet pressure control type adjusting device for the turbocharged engine is reasonable in design, simple in structure and suitable for a turbine single inlet turbocharged system.

The invention provides a method for cleaning an ultrafiltration membrane, which comprises a physical cleaning method and a chemical cleaning method. The physical cleaning method comprises a process of air scrubbing of ultrafiltration membrane components and a process of backwashing of the ultrafiltration membrane components. The process of air scrubbing of the ultrafiltration membrane comprises the following steps: ultrafiltration membrane components discharges concentrated water when compressed air is introduced, wherein the air inlet pressure of the ultrafiltration membrane components is less than 2.5 bar and more than 1.5 bar, compressed air is introduced for 1 minute, sewage in the ultrafiltration membrane components is exhausted after air scrubbing is completed, backwashing for once is carried out according to the backwashing process of the ultrafiltration membrane components. The chemical cleaning method comprises the following steps: carrying out forward cleaning circulation ofthe ultrafiltration membrane components; preparing an alkaline cleaner, carrying out forward cleaning circulation of the ultrafiltration membrane components; immersing the ultrafiltration membrane components. The method for cleaning the ultrafiltration membrane is capable of eliminating the pollution of the ultrafiltration membrane components, recovering the performance of the ultrafiltration membrane components, ensuring the normal operation of the ultrafiltration membrane components and prolonging the usage life of the ultrafiltration membrane components as long as possible.

The invention relates to a test device for evaluating a well completion manner of coal bed methane. The test device comprises a well completion manner simulation model system which is arranged in a constant-temperature box; the well completion manner simulation model system consists of a core holder and a well completion model which is arranged in the core holder; the core holder comprises a metal cylinder with both sealed ends; a gas-liquid inlet is arranged at one sealed end of the metal cylinder, and a gas-liquid outlet is arranged at the other sealed end of the metal cylinder; a cylindrical rubber sleeve with both opened ends is sleeved in the metal cylinder; the well completion model comprises a cylindrical raw coal core which is arranged in the cylindrical rubber sleeve; a well completion simulation sheet provided with a through cutting seam or a through hole is adhered to the end face opposite to the gas-liquid outlet of the raw coal core; a gas-liquid pressurized injection system and an inlet pressure sensor are connected with the gas-liquid inlet of the core holder; the gas-liquid outlet is connected with a coal powder collecting and metering system and an outlet pressuresensor; and the core holder is connected with a loading device which is used for loading a confining pressure to the well completion model inside the metal cylinder.

The invention relates to a porous medium biological clogging simulation test device and a simulation test evaluation method. The porous medium biological clogging simulation test device is characterized by comprising a plurality of biological clogging simulation single bodies, wherein each biological clogging simulation single body comprises a first column body and a second column body; the first column body is provided with a water inlet and a water inlet pressure sensor; a first permeable plate is arranged inside the first column body; the junction of the first column body and the second column body is provided with a second permeable plate, and the second column body is provided with a water outlet pressure sensor and a water outlet; a circulating water supply device comprises a water storage tank, the inside of the water storage tank is connected with a peristaltic pump through a pipeline, and the peristaltic pump is connected with a water inlet on each first column body through a pipeline; a water outlet of each second column body is connected into the water storage tank through a pipeline; a stirring device comprises a motor which is arranged on the top of the water storage tank, the output end of the motor is connected with a stirring shaft which is plugged inside the water storage tank, and the stirring shaft is provided with a stirring blade; and a pressure collecting device comprises a pressure collection controller, the input end of the pressure collection controller is connected with each water inlet pressure sensor and each water outlet pressure sensor, and the output end of the pressure collection controller is connected with a computer.

The invention relates to a mixed airplane brake system and a control method. A brake valve of the mixed airplane brake system is connected to a airplane pressure supply system, an electro hydraulic servo valve oil inlet and an oil returning tank through a pipeline; the electro hydraulic servo valve is connected to a brake nozzle of the brake valve, an oil inlet of the electromagnetic valve and an airplane oil return tube through the pipeline; and an electromagnetic hydraulic lock and the electro hydraulic servo valve are parallel channels on a hydraulic line. An oil inlet pressure transducer is arranged on the pipeline between the brake valve and the electro hydraulic servo valve; a brake port pressure transducer is arranged on the pipeline between the electromagnetic valve and a brake machine wheel. Under the failure of the electro hydraulic servo valve, an airplane antiskid brake control system can automatically convert a current normal brake mode to a standby brake mode and then enables reliable operation, driver intervention is not required, so that the work load of the driver is reduced. The mixed airplane brake system enables mode record on a fault state of the electro hydraulic servo valve, and is convenient for troubleshooting and maintenance by maintainer after flight.

The invention discloses a method and a system for controlling a variable-altitude self-adapting supercharging for a diesel engine, relating to the technical field of supercharging control for a diesel engine, which is characterized in that an optimal supercharging pressure MAP is inquired to obtain the optimal supercharging pressure under the working condition of a stable state according to an inlet pressure signal of an air compressor, a rotating speed signal of an engine and a position signal of a gasoline throttle, the opening of a nozzle ring of a turbine is controlled by using a PI controller according to the difference value between the optimal supercharging pressure and the actual supercharging pressure to obtain an optimal circulating section; an optimal opening MAP of the nozzle ring is inquired to obtain the optimal opening of the nozzle ring under the working condition of a transient state according to the rotating speed signal of the engine and the inlet pressure signal of the air compressor so as to control the optimal circulating section. The system comprises a diesel engine, an intercooler, a variable-section supercharger consisting of an air compressor and a variable-section turbine, an electronic control unit, a pressure sensor and a temperature sensor etc. The method and system can adapt to the altitude variation and adjust the circulating section of the variable-section turbine so that the diesel engine has optimal dynamic property and fuel economy at each altitude.

A water supply apparatus with self-balanced inlet pressure without negative pressure is described, which includes a tank, an air pump, a water pump, a micro-processor based automatic control unit, pressure sensors, level sensors, unidirectional valve. Features of this new design include dual cavity storage tank and air activated pressure stabilizer. In the tank a pre-pressed gas is contained. The pressure is maintained using a self-balanced pressure stabilizer. There is no need to add environmental air. Subsequently, environmental air related pollution is avoided.

A pilot operated pressure valve which limits the rate of start-up pressure rise ("soft start-up") and substantially eliminates excessive system pressure spikes. The valve includes an inlet, a hollow cylindrical main body sealingly connected at one end thereof to the inlet, a pilot chamber having a sleeve slidably mounted within the main body and an operating pressure adjustment connected to another end of the main body adjacent another end of the pilot chamber for varying the threshold operating pressure of the valve. A main chamber receives pressurized fluid metered through a main orifice and discharges pressurized fluid through a damping orifice when the main chamber is filled and fluid inlet pressure exceeds the inlet threshold pressure which is just sufficient to open a spring biased pilot ball downstream of the damping orifice. An exit port upstream of the main orifice will open for discharging pressurized fluid from the valve back to a supply tank when inlet pressure exceeds the maximum operating pressure setting of the valve. Pressurized fluid is also metered from the pilot chamber into a pressure compensated priority flow control valve arrangement including an adjust chamber to automatically vary the operating pressure of the valve in "soft start-up" fashion by selectively discharging pressurized fluid from the pilot chamber and/or the adjust chamber in modulated fashion when fluid pressure reaches the threshold operating pressure.