42results about How to "Reduce irreversibility" patented technology

A method and system for generating power from low- and mid-temperature heat sources using a zeotropic mixture as a working fluid. The zeotropic mixture working fluid is compressed to pressures above critical and heated to a supercritical state. The zeotropic mixture working fluid is then expanded to extract power. The zeotropic mixture working fluid is then condensed, subcooled, and collected for recirculation and recompression.

The invention relates to an inner thermal storage solar low-temperature thermal power generation system. The power generation system comprises a compound parabolic heat collector system, a thermal storage system and an organic Rankine cycle power generation system, wherein, the compound parabolic heat collector system comprises a high-temperature end compound parabolic heat collector array and a low-temperature end compound parabolic heat collector array; the thermal storage system comprises a liquid storage tank, a coil and a phase-change material; and the coil is evenly distributed in the liquid storage tank and the coil is internally filled with the phase-change material. The organic Rankine cycle power generation system comprises an evaporator, a steam turbine, a motor, a heat regenerator, a condenser, two pumps and six valves. Compared with the traditional solar thermal power generation system, the inner thermal storage solar low-temperature thermal power generation system is characterized in that: an inlet end of the steam turbine is provided with a phase-change thermal storage system which usually has very small power of thermal storage and heat release, thus reducing the average heat-exchange temperature difference between the phase-change material and an organic working substance; and on the other hand, a two-stage evaporator of a two-phase region and a liquid region is adopted in the system, thus being capable of reducing heat transfer irreversibility between heat-transfer fluid and the organic working substance, and lowering the average operating temperature of the heat collectors.

The invention relates to a solar-energy low-temperature thermal power-generation and photovoltaic power-generation combination system, comprising a compound parabolic collector system, a heat storage system, an organic rankine cycle power-generation system, a photovoltaic module and a photovoltaic power-supply system, wherein the compound parabolic collector system comprises a high-temperature end compound parabolic collector array and a low-temperature end compound parabolic collector array, and the photovoltaic module is arranged on the upper part of a heat absorber of the compound parabolic collector; the heat storage system comprises a liquid storage tank in which coil pipes are equally arranged, and PCM (phase change material) is filled in the coil pipes; the organic rankine cycle power-generation system comprises an evaporator, a steam turbine, a generator, a heat regenerator, a condenser, two pumps and six valves. The total power-generation efficiency of the combination system is greatly enhanced; and the adoption of the heat storage system avoids the application of additional accumulators and complicated tracking devices, thus reducing cost; and the adoption of two-class evaporator reduces non-reversibility of heat transmission of heat-exchanging fluid and organic work-medium so as to reduce average running temperature, thus being in favor of prolonging service life of photovoltaic cells.

An electrolyser for high-temperature electrolysis configured to operate in an allothermal mode, including an enclosure configured to maintain an electrolytic bath under high or very high pressure of several tens of bars, in which at least one electrolysis plate is arranged, and a heater internal to the enclosure. The electrolysis plate includes a plurality of electrolysis cells lying side by side in substantially one same plane, each electrolysis cell including an anode and a cathode. The heater uses a heat-carrier fluid.

The invention discloses a gasification method for classification conversion of hydrocarbon components of coal. The method is based on the principle of 'proper components and classification conversion' of fuel; coal gasification is accomplished through three steps including carbonization, production of carbon monoxide, and transformation to produce hydrogen; firstly, coal is carbonized to be purified so as to obtain crude coke, then the crude coke reacts with carbon dioxide to produce carbon monoxide, and finally, hydrogen and carbon dioxide are produced through transformation reaction, and carbon dioxide is supplied to a coke carbon monoxide unit; composite coal gas with different carbon-hydrogen ratios can be obtained by mixing hydrogen, carbon monoxide and coke oven gas; and heat required during the carbonization process of coal and the generating process of carbon monoxide is supplied by coal burning. According to the invention, the gasification process of coal is accomplished through three steps including coking, gasification and transformation to produce hydrogen, so that the irreversibility of the whole gasification reaction can be lowered, and the gasification efficiency of coal is improved remarkably; a space division device and a waste heat boiler are removed, so that the equipment investment is reduced; and fuels include gasification coal and heat supply coal, so that the adaptability of coal can be improved greatly.

The invention relates to a multi-working-medium backheating type Rankine cycle system. The multi-working-medium backheating type Rankine cycle system utilizes a turbine to pump steam to heat the air and boiler feed water (or including liquid and gas fuel), so that the identical effect of heating feed water by pumping steam and cycling backheating is achieved. A smoke-air short circuit is effectively avoided by omitting an air preheater in a tail flue. Exhaust temperature is effectively lowered and low-temperature corrosion of smoke is avoided during heat transfer intensifying by arranging the air preheater outside a boiler and arranging a feed water overheater, a feed water heater and a phase change heat exchanger.

Materials are presented of the formula:

• • A_x M_y Mⁱ_zi O_2-d, where A is sodium or a mixed alkali metal including sodium as a major constituent;
    • x>0;
    • M is a metal or germanium;
    • y>0;
    • Mⁱ, for i=1, 2, 3 . . . n, is a transition metal or an alkali metal;
    • z_i≧0 for each i=1, 2, 3 . . . n;
    • 0<d≦0.5;
    • the values of x, y, z_i and d are such as to maintain charge neutrality; and
    • the values of x, y, z_i and d are such that x+y+Σz_i>2-d.
  • The formula includes compounds that are oxygen deficient. Further the oxidation states may or may not be integers i.e. they may be whole numbers or fractions or a combination of whole numbers and fractions and may be averaged over different crystallographic sites in the material. Such materials are useful, for example, as electrode materials in rechargeable battery applications. Also presented is a method of preparing a compound having the formula A_x M_y Mⁱ_zi O_2-d.

The invention discloses a data destruction method, device and equipment and a readable storage medium. The method disclosed by the invention comprises the following steps: if a data destruction instruction is received, determining a storage position of to-be-destructed data according to the data destruction instruction; processing the target data by using a Knuth-Durstenfeld Shuffle algorithm to obtain disordered data, and performing overwriting operation on the storage position by using the disordered data; and processing the disordered data by using a hash direct remainder method to obtain atarget hash value, and performing overwriting operation on the storage position again by using the target hash value. The data destruction method and device can improve the data destruction efficiency, reduce the possibility that the destructed data is recovered, and improve the security of the destructed data. Correspondingly, the invention also discloses a data destruction device and equipmentand a readable storage medium, which also have the above technical effects.

The push member device (1) of the present invention includes a rotatable mounting (4), the inner circumference (5) of which is eccentric relative to the outer circumference (6). The mounting (4) is rotationally biased in a direction by a spring (10) and is placed against the back of the rack (2) that is thus pushed against the teeth of the steering pinion. The rotatable mounting (4) is rotatably mounted in a housing (7), itself being slidably mounted in the steering gearbox. A shock absorbing spring means (11) is arranged between the sliding housing (7) and the steering gearbox to absorb the alignment defects of the rack (2).

The invention belongs to the technical field of hydrogen production equipment, and particularly relates to a hydrogen liquefaction device with a pre-cooling throttling function. The device comprises ahydrogen liquefaction route for conveying raw material hydrogen and a hydrogen circulation route for conveying circulating hydrogen, and the two routes respectively and sequentially pass through a primary pre-cooling section, a secondary pre-cooling section and a liquefaction section. The primary pre-cooling section is provided with a heat exchanger I and a normal-pressure liquid nitrogen pre-cooler; and the secondary pre-cooling section is provided with a heat exchanger II and a negative-pressure liquid nitrogen pre-cooler. After the hydrogen liquefaction route passes through the first heatexchanger and the normal-pressure liquid nitrogen pre-cooler to be precooled, the hydrogen liquefaction route enters the second heat exchanger and the negative-pressure liquid nitrogen pre-cooler to be continuously cooled. According to the hydrogen liquefaction device with the pre-cooling throttling function, a two-stage pre-cooling structure of the normal-pressure liquid nitrogen pre-cooler and the negative-pressure liquid nitrogen pre-cooler is adopted, and the liquefaction effect is better.

An expansion turbine stage for compressed gases has a housing and a turbine rotor. The housing has flow guide channels for feeding the compressed gas to the turbine rotor. The turbine rotor, which is over-mounted and has centripetal flow through it, is followed by an out-flow diffuser enclosed by the housing, to delay the cold expanded gas. The out-flow diffuser is arranged in a holder bore in the housing, as a separate component. For thermal insulation of the housing relative to the cold expanded gas stream, the out-flow diffuser is made of a non-metallic material having a low heat conductivity.

A propulsion system is composed of vehicles with four wheels having one of the axles connected to a pylon attached to the propulsion plate. The vehicles move over rails of elevated guideways supported by pillars. The top of the elevated guideways has longitudinal slots for allowing passage of pylons of propulsion plates. The elevated guideway is dual and has two power propulsion units for propulsion operation in a push and/or pull mode, one for each elevated guideway. The power propulsion units are installed inside the machine rooms under the pavement of the sob passenger stations supported on pillars. The power propulsion units are connected to the elevated guideways by means of connection ducts. Secondary propulsion ducts are disposed in parallel with the propulsion duct and integrated with its respective flow direction valve which allows that the air flow generated by the power propulsion unit is discharged in the propulsion duct in two distinct positions. The pneumatic propulsion arrangement is completed by isolation valve sets of the guideway section, atmospheric valve sets, set of four air flow control valves mounted in the connection ducts of the power propulsion units and flow direction valves.

The invention relates to a supercritical carbon dioxide coal body extraction and deep hole no-coupling charging carbon dioxide medium pressure relief blasting gas control method and device. The methodcomprises the following steps that an underground blasting-preventing drilling machine is adopted for constructing a blasting extraction hole in a coal bed, and a blasting material and a supercritical CO2 extraction pipeline are installed in the blasting extraction hole; a hole sealing material is utilized for sealing the blasting extraction hole; the extraction pipeline is utilized for inputtingsupercritical CO2 into the blasting extraction hole for extracting methane in the coal bed; the blasting material in the blasting extraction hole is detonated, and the control process of gas is completed. The method fully utilizes the special physicochemical property of supercritical CO2 and the advantage of deep hole pressure relief control over dynamiting.

The invention relates to a method and a device for separating a coupled alkane catalytic dehydrogenation reaction product, and the method comprises the following steps: inputting product gas at an outlet of an alkane dehydrogenation reactor into a cold box system to obtain a cooled product; the cooled product is input into N stages of gas-liquid separation tanks connected in series for gas-liquid separation, and then gas-phase products obtained from the first stage to the (N-1) th stage are input into the cold box system again; liquid-phase products obtained at the 1-N stages are collected, reheated and sent out of a boundary area, and then separation of products with different carbon numbers of the liquid-phase products is achieved through a separation tower; circulating gas obtained at the top of the Nth-stage separation tank and fresh propane are subjected to M-stage mixing according to a preset hydrogen/hydrocarbon ratio and subjected to throttling evaporation in a cold box system, and cold energy is provided for the cold box system; introducing the tail gas at the top of the dethanizer into a cold box system, and providing cold energy for the cold box system; and the cold energy of the cold box system also comes from an external refrigeration cycle system. Separation energy consumption can be reduced, product loss is reduced, the technological process is simple and environmentally friendly, equipment is compact, and starting/stopping is convenient and fast.