35 results about "Entropy production" patented technology

The invention discloses horizontal-type high temperature heat-storage heat supplying equipment and a using method thereof. The horizontal-type high temperature heat-storage heat supplying equipment comprises a heat storage tank filled with a heat storage medium; the bottom of the heat storage tank is provided with an electric heating device for heating the heat storage medium, and the electric heating device is connected with an electricity supplying system; a heat exchanging device with an adjustable heat exchanging area is horizontally arranged on the upper part of the heat storage tank in apenetrating mode, and the heat exchanging device is composed of a heat releasing medium inlet section, a heat exchanging section and a heat releasing medium outlet section which are connected in series; and the heat exchanging section is composed of a plurality of heat exchangers which are connected in series and / or in parallel, all the heat exchangers are arranged from bottom to top, the heat exchanger at the very bottom is connected with the heat releasing medium inlet section, and a valve group is mounted on the heat exchanging section and used for controlling a heat exchanger to work or controlling the multiple heat exchangers to work simultaneously. According to the horizontal-type high temperature heat-storage heat supplying equipment and the using method thereof, heat is stored byutilizing off-peak electricity during night or abandoned wind and light 'waste electricity', and steam is produced in daytime, so that entropy production is reduced, the energy utilization efficiencyis enhanced, the electricity transmission capacity of a power grid is increased, and the cost of steam production is reduced substantially.

The invention relates to a series of devices with the upward water flow function under the situation that conventional energy consumption does not exist, in particular to a simple channel device achieving spontaneous lighting. The problem that entropy production is irreversible in the energy circulation process is mainly solved, and in other words, negentropy is achieved. The potential energy of water is increased and changed into water flow kinetic energy, the water flow kinetic energy promotes a water turbine to generate power, and electric energy is output to lighting lamps to emit light for lighting after passing a control system and an energy storage system. The device comprises a device body with the upward water flow function, a downward water flow channel, a water turbine generator, an electric control system, the lighting lamps, and an anti-seepage and anti-evaporation closed system. By means of the whole system, the potential energy of the water can be increased under the situation that conventional energy is not consumed, the conversion between the potential energy and the kinetic energy, conversion between the kinetic energy and the electric energy and conversion between the electric energy and visible radiation can be achieved, the light spontaneous lighting is achieved, other energy is not additionally consumed, negentropy is achieved on the basis of the thermodynamics entropy production aspect, and the frequent happening frequency of the earth natural disasters can be finally reduced through the negentropy path.

The invention discloses a method for generating electricity by means of low temperature exhaust heat of a power plant and relates to an unconventional electricity generating method. The problems of excessively large exhaust heat discharge and environment pollution caused by heat of a thermal power plant or a nuclear power plant are mainly solved, and the waste heat is converted to electric energy is achieved through exhaust heat electricity generation. Theoretically, the situation of nonreversible entropy production during energy cycle is solved, that is, the entropy production direction is changed, and negentropy is achieved. Water potential energy is increased through equipment with the upward flowing function; the potential energy is converted to kinetic energy through water fall, and a water turbine is driven to generate electricity; meanwhile, the upward-flowing equipment absorbs a large amount of heat, including low temperature heat, during upward flowing; rapid upward flowing of water can be achieved through a certain structure, and finally energy cycle is achieved. The electricity is generated in the process and supplied to people, a beneficial energy cycle of the nature can be achieved, that is, negentropy is achieved on the basis of thermodynamics entropy production, and the frequency of natural disasters on the earth can be reduced finally.

The invention relates to a hydraulic mechanical property analysis method based on numerical calculation, and belongs to the technical field of hydraulic machinery. Establishing a model according to the actual hydraulic machinery picture, dividing grids, determining boundary conditions, and performing numerical simulation to obtain a simulation result; adopting Tecplot software to obtain a speed cloud picture and a pressure cloud picture of the most basic physical quantity related to the speed and the pressure according to the obtained simulation result; obtaining a cavitation volume fraction contour cloud picture, and predicting and analyzing the cause of the cavitation part; obtaining an isoline cloud picture of the vortex structure, and predicting and analyzing reasons of the vortex generation region; and obtaining an entropy production cloud picture, and predicting and analyzing reasons of an area with relatively large hydraulic loss. The method has great significance in improving the efficiency of hydraulic machinery, reducing cavitation and improving the stability of a unit in actual engineering.

The invention discloses a hydraulic optimization design method of an annular water-compressing chamber of a nuclear power pump based on entropy generation analysis. The hydraulic optimization design method comprises the following steps: selecting design parameters of the annular water-compressing chamber for nuclear power according to impeller parameters and performance requirements, and carrying out initial calculation on a design range of design parameters of the water-compressing chamber; carrying out multi-scheme design on the annular water-compressing chamber by adopting a testing design method; carrying out three-dimensional modeling, mesh dividing and numerical simulation; applying the entropy generation analysis to obtain entropy generation loss of the annular water-compressing chamber; and establishing a function relation between the design parameters and the entropy generation loss by adopting an approximate model and solving the function by applying an optimization algorithm to minimize the entropy generation loss, so as to obtain optimal design parameters of the annular water-compressing chamber. With the adoption of the hydraulic optimization design method, the hydraulic efficiency of the annular water-compressing chamber is effectively improved; and the sphere-like water-compressing chamber is adopted and safe operation is guaranteed.

An efficient multistage throttling LNG device comprises a natural gas inlet pipe, an LNG storage tank, a refrigerant compressor, refrigerant separation tanks and a cold cabinet. The efficient multistage throttling LNG device is characterized in that a main heat exchanger and an auxiliary heat exchanger are arranged in the cold cabinet, the natural gas inlet pipe sequentially passes through the main heat exchanger and the auxiliary heat exchanger and then is connected with a feed inlet of the LNG storage tank, a fourth throttling valve is arranged between the auxiliary heat exchanger and the LNG storage tank, and the number of the refrigerant separation tanks is five. Cooling capacity needed by supply is achieved in a segmented mode, entropy production of the liquidation process is minimized, and efficiency approximates step-type circulation. The problems that an existing LNG device is low in utilization rate of refrigeration cycle cooling capacity, high in entropy loss of a compressor, complex in structure and the like are solved fundamentally.

The invention belongs to the field of heat exchange equipment, and discloses a flow control method for heating a heated fluid in stages by adopting a heat exchange system. The heat exchange system comprises a pre-heater, an evaporator and a super-heater; the pre-heater is connected with the evaporator and the super-heater in sequence; the pre-heater is used for heating a sub-cooled fluid to a saturated fluid; the evaporator is used for heating the saturated fluid to a saturated gas; the super-heater is used for heating the saturated gas to a superheated gas. According to the flow control method for heating the heated fluid in stages by adopting the heat exchange system, the terminal temperature difference between an outlet and an inlet of each evaporator is reduced by controlling the flow of the heating fluid in the heat exchange system, so that the entropy production produced in a heat exchange process can be reduced; the energy utilization rate of the system is improved.

The invention relates to a real-time monitoring method and a monitoring system for thermal efficiency indices of a generator set. The monitoring system comprises a data terminal, a computer, a data acquisition instrument and 1-20 IPM (Intelligent Power Module) acquisition boards, wherein the computer is connected with the IPM acquisition boards through the data acquisition instrument, and the IPM acquisition boards are connected through data cables. Detection steps include: (1) original test data is acquired; (2) the accuracy of the acquired original test data is judged by an entropy production module; (3) a differential flow pressure signal in step (1) is converted into actual test condensed water flow Dns0, and is input into a thermal efficiency index module of the generator set; and (4) the thermal efficiency indices of the generator set are computed by the thermal efficiency index module of the generator set. On the basis of a data acquisition system, the thermal efficiency indices of the generator set are monitored in real time, a test is controlled, faults are checked, blindness and deviation in fault checking are reduced, the test cost is reduced, and the evaluating and monitoring accuracy and the reliability of a testing result are improved.

The invention discloses a split-cooled aeroengine compressor rear shaft diameter cone wall cavity, which is different from the traditional aeroengine air system components in which a single type of air-introduction hole is provided for air-intake cooling, but the stator cone surface and the stator drum respectively The pre-rotating nozzles with two apertures on the surface can not only realize the reasonable distribution of the cooling air flow and the reasonable configuration of the cooling parts under the condition of the total flow of the bleed air, so as to achieve precise cooling, but also shorten the flow of the cooling air in the flow channel. The flow distance can significantly reduce the wind resistance of the rotor to the cooling airflow, reduce the entropy of the airflow, improve the quality of the cold air, and can also ensure the cooling quality of the airflow out of the cone wall cavity while ensuring that the cone wall is in a comprehensive and good cooling state. The improvement of the cone wall cavity makes the downstream components get better cooling effect. The invention conforms to the low-entropy production design concept of the flow path of the air system, and can be widely used in the cooling scheme design of the air system of the advanced aeroengine.

The invention discloses a stage refrigerating cycle liquefaction process, which comprises the propane cycle process, the ethylene cycle process and methane cycle process. The stage refrigerating cycle liquefaction process has low energy consumption; because a nine-stage liquefaction flow is adopted, the refrigeration temperature in each stage approaches a cooling curve of a feed gas, entropy production is decreased, and the energy consumption approaches the theoretical thermodynamic efficiency upper limit; a refrigerant is a pure substance, a proportioning problem is avoided, and the operation is stable; in a cycle, a single refrigerant is adopted and easily keeps the given temperature in the cooling process, and because the components of a cycling medium are always same, a device can quickly start and stop, and the operation is stable; and a technology is mature and the surging of a compressor is reduced; and because the compressor always intakes gas with constant molecular weight, the surging danger of the compressor is reduced.

The invention relates to a series of equipment with a water upflowing function without conventional energy consumption, in particular to calcium-sulfate-made equipment with a water upflowing function. The problem that entropy production is irreversible in the energy cycle process is solved, namely negative entropy is realized, water potential energy is increased, and energy cycle is achieved. The equipment comprises an immersed body (1), a pipeline shell supporting body (2), pipeline inner capillary channels (3) and a pipeline water outlet body (4); the pipeline inner capillary channels (3) are made of a hydrophilic material polyvinyl alcohol, wherein hydrogen bonds are easy to form between polyvinyl alcohol and H2O, and the pipeline water outlet body (4) is located on the upper middle or upper portion of a system. The water upflowing function can be achieved, water potential energy is increased without conventional energy consumption, beneficial energy cycle in the nature is realized, namely negative entropy is realized on the basis of the thermodynamics entropy production direction, and finally frequent occurrence of natural disasters on the earth is reduced.

The present invention provides a thermal performance evaluation system and method of a vertical steam generator, which includes dividing a plurality of different regions according to the single or two-phase characteristics of the tube side and shell side structure of the steam generator and fluid flow to establish their corresponding entropy production calculations The thermal hydraulic modeling module of the model; the detection module for detecting the temperature, pressure and flow signals corresponding to the tube side and the shell side during the operation of the steam generator; according to the processed temperature, pressure and flow signals, and call the corresponding entropy The production calculation model calculates the corresponding entropy production according to the tube side and the shell side respectively, and calculates the total entropy production of the heat exchange system of the steam generator, which is a calculation and analysis module for overall evaluation of the thermal performance of the steam generator; the present invention simultaneously Considering the irreversible entropy production on the tube side and the shell side, it covers all areas of the steam generator and fully feeds back the whole heat transfer process of the steam generator; it provides a valuable reference for the design and thermodynamic analysis of the steam generator.

The invention relates to the field of hydraulic optimization of a centrifugal pump, and discloses an optimal design method of a centrifugal pump impeller. According to the optimal design method, the optimal working point of the centrifugal pump impeller can be determined more accurately and quickly under the common constraints of vortex structure and entropy production, corresponding impeller design parameters are obtained, so that hydraulic performance and stability of the impeller are better. According to the technical scheme, the optimal design method of the centrifugal pump impeller is characterized in that the optimal design method of the centrifugal pump impeller comprises the following steps that(1) a set of parameters that need to be optimized are specifically determined accordingto the design requirements and based on design experience; (2) modeling and mesh generation are conducted; (3) CFX simulation verification is conducted; (4) vortex core structure is extracted; (5) entropy production is analyzed; (6) efficient point matching is conducted; and (7) design parameters of the impeller are optimized by using simulated annealing optimization algorithm.