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277results about How to "Reduce start" patented technology

Continuous flow biological denitrification method based on granular sludge, and apparatus

The present invention discloses a continuous flow shortcut nitrification-anaerobic ammonium oxidation biological denitrification method based on granular sludge, and an apparatus. The method comprises: 1) carrying out sludge inoculation culture, and carrying out an active sludge adaptation period; 2) starting a shortcut nitrification-anaerobic ammonium oxidation reaction; 3) performing an anaerobic ammonium oxidation granular sludge formation and growth period; and 4) performing a stable operation period of a granular sludge continuous flow system. The apparatus comprises a water inlet tank, a bioreactor, a sedimentation tank and a hydraulic screen filter, wherein the water inlet tank, the bioreactor, the sedimentation tank and the hydraulic screen filter are sequentially communicated, the influent of the water inlet tank is communicated with high ammonia nitrogen wastewater, the effluent is communicated with the bioreactor, the concentrated sludge on the bottom of the sedimentation tank is communicated with the bioreactor through a sludge reflux pump, a fixation filler, a stirrer, a filtration screen and an aeration head communicated with an air compressor are arranged inside an anoxic reactor, the sedimentation tank is provided with a clear overflow port communicated with the hydraulic screen filter through a pipeline, the effluent of the hydraulic screen filter is the final effluent, and the retained granular sludge refluxes to the bioreactor.
Owner:BEIJING JIAOTONG UNIV

Miniature permanent magnet synchronous motor

The invention discloses a miniature permanent magnet synchronous motor which comprises a stator and a permanent magnet rotor which have equal number of poles. An alternating current source supplies power to the stator through a switch of a control circuit, and an air gap between the stator and the rotor narrows down from one pole to another pole along the rotating direction so that the axis of each pole of the rotor under free state deflects for an acute angle along the rotating direction by taking the axis of the nearest pole of the stator as the reference. A linear magnetic position sensor is installed at a set position on the circumference of the rotor so as to detect the polarity and the position of the rotor; the control circuit determines the axis direction of the permanent magnetic flux of all the poles of the rotor according to the output of the sensor and by taking the set position as the reference. The control circuit detects the polarity of the voltage supplied to the stator by the power source so as to determine the axis direction of the main fluxes generated by all the poles. The switch switches on the power source half-wave when the motor is started and the intersection angle between the axis direction of the main fluxes and the axis direction of the permanent magnetic fluxes is the above acute angle or when the motor runs and the axis direction of the main fluxes is opposite or approximately opposite to the axis direction of the permanent magnetic fluxes. The motor has good starting performance in preset rotating direction and good operational performance and the control structure of the motor is simple and reliable.
Owner:HANYU GRP CO LTD

Low-power ventilating fan

The invention provides a low-power ventilating fan which comprises a minisize permanent magnet synchronous motor and an impeller which can be directly driven by the motor and can rotate according to a predetermined rotating direction, wherein the impeller is of an axial-flow type and manufactured in an injection moulding mode, the diameter of the impeller is not more than 150mm; the pole number of a motor stator is 4 or 6 or 8, the winding of the stator is connected to an alternating current power supply according to a specified winding direction; the pole number of a permanent magnet rotor is the same with that of the stator; air gap of each pole can be narrowed along the rotating direction, so that each pole axis of the rotor can deflect an acute angle along the rotating direction in the free state by taking the axis of one pole of the closest stator as a reference; a position sensor can detect the rotor at a set position on the circumference of the rotor, a control circuit can determine the direction of each polar permanent magnet flux and detect the power supply polarity by taking the position as a reference and the output of the sensor so as to determine the axis direction ofeach polar main flux of the stator; when the motor starts, a switch can connect the half wave of the power supply if the main flux axis direction and the permanent magnet flux axis direction are intersected and form the acute angle; or when the motor runs, the switch can connect the half wave of the power supply right now if the main flux axis direction is opposite to the permanent magnet flux axis direction or close to the opposite direction. The ventilating fan has better performance in the starting and running processes, while the cost is relatively low.
Owner:叶露微

Method for preparing anode of microorganism fuel battery with graphene and ferrous disulfide compound

ActiveCN106784829AImprove performanceLower anode electron transfer resistanceCell electrodesBiochemical fuel cellsIonCvd graphene
The invention discloses a method for preparing the anode of a microorganism fuel battery with a graphene and ferrous disulfide compound, and belongs to the field of environments, materials and energy. The method comprises the following steps: (1) gradually dropping a ferric trichloride and thiourea solution into a graphene oxide dispersion in a reaction kettle one droplet by one droplet, uniformly stirring, sealing the reaction kettle, and performing hydrothermal reaction for 12-24 hours within 140-200 DEG C so as to obtain a hydrogel sample; (2) washing the hydrogel sample for times with deionized water, performing freeze-drying, and crushing so as to obtain a nano powder of the graphene and ferrous disulfide compound; (3) mixing the nano powder with a 5% nafion solution, isopropanol and deionized water, uniformly oscillating, coating carbon cloth with the solution, fixing the carbon cloth with a fixing part, and drying the carbon cloth in air, so as to obtain the anode. The method has the advantages that the synthesis steps are very simple, obtained particles are uniform in morphology, graphene lamellas are overlapped to form a well-developed porous structure, good electrochemical properties and biocompatibility can be achieved, and the anode of the microorganism fuel battery has very good properties.
Owner:HARBIN INST OF TECH

Medium-free micro pulverizer

The invention provides an ore crushing machinery without adding a crushing medium, which is a dry crushing machinery with a tower type structure; a rotating part is in the form of a longitudinal rotating shaft; one or more impeller main bodies are mounted on a shaft in series; a plurality of replaceable wear resistant blades and surface protective plates are arranged on each impeller main body, so that the impeller main body forms a rotor impeller group assembly with single-layer or multi-layer blades; a wear resistant lining layer, which comprises an upper lining plate, a material guide lining plate, an arc main lining plate, a bottom lining plate, a wear resistant fixing ring and so on, is correspondingly arranged on the periphery of each impeller; an interior cavity of each impeller forms a crushing chamber; and the crushing chambers in various stages are communicated with each other in a vertical direction. The ore crushing machinery provided by the invention has the advantages of high one-time crushing efficiency, high fine powder qualified rate, convenience in controlling, wide inlet material particle range, long service life, convenience in maintenance and no dust and noise pollution, and is very suitable for ore dressing metallurgy and architectural material industries; and standard dry powders or ore pulps can be directly produced, so that the production process is greatly simplified and production cost is reduced.
Owner:王瑞琪
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