36results about How to "Increase net output power" patented technology

The invention discloses an energy self-supplying type carbon dioxide cold and hot electricity co-generation system used for a low-grade heat source. The energy self-supplying type carbon dioxide coldand hot electricity co-generation system comprises a transcritical carbon dioxide reheat Rankine dynamic cycle system and a transcritical carbon dioxide injection refrigeration cycle system; the energy self-supplying type carbon dioxide cold and hot electricity co-generation system integrates reheat Rankine dynamic cycle and injection refrigeration cycle, adopts carbon dioxide as a single workingmedium, converts low-grade heat energy to useful work through a extraction turbine of the transcritical carbon dioxide reheat Rankine dynamic cycle system and supplies the heat energy to users by using a water heater. The transcritical carbon dioxide injection refrigeration cycle system utilizes high-pressure exhaust waste heat of the extraction turbine to drive an injector to output cold energy to the users. Through reasonable arrangement of the system, the system can output more electric energy. By adoption of a working medium pump and a low-pressure-ratio gas compressor, the energy self-supplying type carbon dioxide cold and hot electricity co-generation system reduces compression power efficiently during the system operation and improves net electric generation and conversion efficiency of the low-grade heat energy of the system.

The invention discloses a control method for two degrees of freedom (2DOF) of proton exchange membrane type fuel cell (PEMFC) system based on an optimal oxygen enhancement ratio (OER). According to the control method, an H-order supreme feedback control (HSFC) method and a feedforward control (FFC) method are combined, a variable to be controlled via dual functions of the two methods, wherein the HSFC method adopts a linear matrix inequality (LMI) method for solution, and FFC adopts a polynomial fitting technique based on the QR (orthogonal matrix/upper triangular matrix) decomposition of the Vandermonde matrix for design. By adopting the control method, the optimal OER trajectory of the system can be tracked under conditions with large load current fluctuations, parameter perturbation and environmental interference noise, the parasitic power consumption of the system can be reduced, and the net output power of the system can be improved. Moreover, the method has good robustness and reasonable servo control behaviors, and the optimal OER and the maximum net output power of the system can be ensured.

The invention discloses a fuel cell engine system and an air supply system thereof, and a control method. The air supply system comprises a hydrogen supply system and an air supply system; a hydrogenoutlet pipeline is connected with a two-position two-way valve; the two-position two-way valve is connected with a first hydrogen circulating pipeline and a second hydrogen circulating pipeline in parallel; the first hydrogen circulating pipeline is connected to an inlet of a gas compressor of an expansion and gas compression all-in-one machine; and the outlet of the gas compressor is connected toa hydrogen circulation main pipeline, the hydrogen circulation main pipeline is connected to a hydrogen inlet pipeline, a second hydrogen circulation pipeline is connected to the hydrogen circulationmain pipeline through a hydrogen ejector, an inlet hydrogen pressure detection device is arranged on the hydrogen inlet pipeline, and an air outlet pipeline is connected to an expansion machine of the expansion and gas compression all-in-one machine. High-pressure tail gas exhausted by the air supply system is effectively used for driving the expansion and gas compression all-in-one machine to achieve hydrogen cyclic utilization, parasitic loads of the auxiliary system are reduced, and the net output power of the stack is improved.

The invention relates to a method for preparing membrane electrode of proton exchange membrane fuel cell. A method for preparing membrane electrode of water-conserving proton exchange membrane fuel cell is characterized by including following steps: 1) preparing proton conduction polymer modified by inorganic oxide nano-particles: a) firstly, the PH value of the solution containing 1.2 to 10 wt. % proton conduction polymer is regulated to 6.5 to 7.5 by NaOH, and then the solution is transferred into anhydrous organic solvent, thus, solution A can be obtained, in succession, the solution A is distilled to obtain solution B; b) according to the weight ratio of inorganic oxide to proton conduction polymer 0.01 : 1 to 0.1 : 1, the inorganic oxide precursor of the inorganic oxide is added into the solution B prepared in step a) and then is churned for 20 to 30 minute thereby obtaining inorganic oxide precursor solution; c) the preparation of proton conduction polymer modified by inorganic oxide nano-particles; 2) preparing membrane electrode. The membrane electrode prepared by the invention has good water-conserving capacity.

The invention discloses a heat source shunting type waste heat power generation system and a particle swarm optimization control method thereof. The heat source shunting type waste heat power generation system comprises an evaporator and a preheater, the evaporator is connected with an expansion machine, the preheater is connected with a working medium pump, the working medium pump is connected with a condenser, the expansion machine is connected with the condenser, and the condenser is connected with a cold water pump; the cold water pump is connected with the cold water pipe; the particle swarm optimization control method comprises the following steps: setting a variable change interval based on a particle swarm algorithm program in Matlab, calculating the fitness of particles, and obtaining an optimal evaporation temperature tevap' by using a genetic algorithm; the optimal primary split ratio is rsp1', the secondary split ratio is optimized to be rsp2', and the maximum net output power Wnet'; and optimizing the shunting flow of the system. The particle swarm optimization is used as an optimization control method, and the particle swarm optimization is used for optimizing the independent variables of the heat source shunting waste heat power generation system under the non-design working condition, so that the maximum net output power operated under the optimal control independent variable condition is obtained.

The invention discloses a pump-free Rankine cycle and liquid metal combined power generation system which comprises an adsorption-Rankine cycle power generation cycle module and a liquid metal magnetofluid power generation cycle module. The adsorption-Rankine cycle power generation cycle module comprises a generator, an expansion machine, an adsorption bed a, an adsorption bed b and an aeration pipe; and the liquid metal magnetofluid power generation cycle module is composed of an annular channel structure and liquid metal. The adsorption beds alternately work to replace a working medium circulating pump, the input power of the working medium circulating pump can maximally account for 45% of the output power of the expansion machine, the working medium circulating pump is eliminated, the energy consumption of the system is reduced, and the net output power of the system is improved. The outlet pressure of the expansion machine in the adsorption-Rankine cycle is reduced through the adsorption process of the adsorption beds, and the net output power of the system is further improved. The temperature of the liquid metal in the annular channel structure is more uniform, and the flow ofthe liquid metal is facilitated.

The invention provides a fuel cell system, and the system comprises a hydrogen assembly, an air assembly and a galvanic pile; the air assembly comprises an air compressor and an air pipeline, and the hydrogen assembly comprises a first pipeline for conveying liquid hydrogen; the air compressor is driven by a superconducting motor, and the air compressor is communicated with an air inlet of the galvanic pile through the air pipeline; the hydrogen assembly is communicated with a hydrogen inlet of the galvanic pile, the hydrogen assembly vaporizes liquid hydrogen and then sends the liquid hydrogen into the galvanic pile, and the first pipeline is connected with a cooling pipeline of the air compressor so that the liquid hydrogen in the first pipeline can enable a superconducting motor of the air compressor to be cooled to the working temperature. The fuel cell system has the advantages that the low-temperature characteristic of liquid hydrogen is effectively utilized; the net output power is improved; and the power density of the fuel cell system is improved.

The invention relates to a fuel cell cooling circulation system which comprises an electric pile, an air loop, a cooling loop and a pressure loop, wherein the air loop comprises an air compressor, and air compressed by the air compressor is introduced into the electric pile from an air inlet of the electric pile and is discharged out of the electric pile from an air outlet of the electric pile; the cooling loop comprises an expansion water tank and a water pump, cooling liquid is introduced into the electric pile under the action of the water pump and flows back to a water inlet of the water pump from the electric pile, and the expansion water tank supplements the cooling liquid for the cooling loop; the pressure loop comprises an air delivery pipe and a one-way valve, the air delivery pipe is connected with the air outlet of the electric pile and the expansion water tank, and the one-way valve is arranged between the air outlet of the electric pile and the expansion water tank. Compared with the prior art, the gas with certain pressure at the air outlet of the electric pile is introduced into the expansion water tank, so that the requirement of the fuel cell on the lift of the water pump is reduced, the cost of the fuel cell is reduced, and the power of the water pump with smaller lift is also smaller, so that the net output power of the system of the fuel cell is increased.

The invention belongs to the technical field of fuel cells, and discloses a hydrogen circulation system and a vehicle, the hydrogen circulation system comprises a hydrogen supply assembly, a gas supply assembly, a first switch valve, an ejector, a galvanic pile, an expansion machine and a hydrogen circulation pump, and high-pressure hydrogen of the hydrogen supply assembly enters the ejector through the first switch valve; the gas supply assembly conveys air into the electric pile at the same time, hydrogen ejected by the ejector reacts with the air in the electric pile, unreacted hydrogen is ejected into the electric pile again through the hydrogen circulating pump, unreacted air is conveyed through a pipeline to impact the expansion machine, and by improving the hydrogen return pressure of the fuel cell, the ejector can achieve a good ejection effect; the expansion machine does work on the hydrogen circulating pump, and hydrogen can be injected back into the electric pile with a very small pressure rise rate, so that the hydrogen circulating pump can realize hydrogen circulation with very small or no electric power consumption, and the net output power of the fuel cell system is increased under the condition of meeting the hydrogen circulation.

The invention discloses a screw expansion (compression) machine with variable volume ratio. The screw expansion (compression) machine comprises a box body (300), an upper supporting end cover (400), an air inlet end cover (500) and a valve core cover plate (600). The upper supporting end cover (400) is fixedly connected with the box body (300) to form a closed cavity (408), the air inlet end cover(500) and the valve core cover plate (600) are arranged in the cavity (408), and the valve core cover plate (600) is arranged below the air inlet end cover (500). A screw expansion machine further includes a main drive shaft (401), an adjusting operating rod (402) and a driven shaft (403), wherein the main drive shaft (401), the adjusting operating rod (402) and the driven shaft (403) are arranged in parallel to each another. The screw expansion machine further includes an air inlet adjusting mechanism arranged in the cavity (408), and the air inlet adjusting mechanism comprises a half-gear cam (700), an adjusting gear (800), a valve core pushing rod (900), a radial sliding spool (603) and a circumferential sliding valve core (604). The screw expansion (compression) machine has an adjustable built-in volume ratio, the optimal matching between the built-in volume ratio and the actual operating pressure ratio of a system can be kept to the greatest extent, and the overall operating efficiency of the screw expansion machine under variable operating conditions is improved.