47results about How to "Has practical promotion value" patented technology

The invention provides a method for reducing the alkalinity of red mud by utilizing industrial wastes. The method comprises the following steps of (1) mixing filtered ammonia-nitrogen wastewater and the red mud, and then stirring to obtain a red mud slurry, wherein the mass ratio of the ammonia-nitrogen wastewater to the red mud is 2 to 4:1; (2) carrying out sedimentation and solid-liquid separation on the red mud slurry obtained in the step (1) to obtain a filter liquor and a filter residue; and (3) adding crushed phosphogypsum into the filter residue obtained in the step (3), then adding water, and cultivating at the room temperature so as to obtain the low-alkalinity red mud, wherein the mass ratio of the phosphogypsum to the filter residue is 1 to 5:100. The method provided by the invention has the characteristics of simplicity in process and low cost; and the Bayer process red mud can be treated in a large scale, the treated red mud can be recycled, the storage yard plants are reconstructed, and favorable social benefit and economic benefit are produced.

The invention discloses a preparation device and a preparation method for a one-dimension photonic crystal band-stop filter. The preparation device comprises a laser light source, a light beam expansion unit, a first reflection mirror and a second reflection mirror, wherein the included angle between the first reflection mirror and the horizontal plane is 44 to 46 DEG C, a red-sensitive photopolymer holographic plate to be treated is placed on the second reflection mirror, incidence light emitted out by the laser light source forms parallel beam expansion light after passing through the light beam expansion unit, the beam expansion light is directly emitted onto the holographic plate through being reflected by the first reflection mirror, the transmitted beam expansion beam is vertically emitted onto the second reflection mirror, the parallel reflection light reflected by the second reflection mirror and the directly emitted beam expansion light form two beams of coherence light in opposite directions inside the holographic plate, and the holographic plate is exposed. The preparation device has the advantages that a light path is simple, the cost is low, in addition, only the single beam light is adopted to be vertically emitted onto the ed-sensitive photopolymer holographic plate, and then, the second reflection mirror is utilized, so two beams of coherence light: the upper beam of coherence light and the lower beam of coherence light are formed inside the holographic plate, and the operation is very convenient.

The invention relates to the field of nonwoven fabric materials for automotive interiors, particularly a sound-absorption sound-insulation needle-punched nonwoven fabric for car trunk carpets and wheel cowl carpets and a preparation method thereof. The nonwoven fabric comprises a surface fabric and a base fabric, wherein the base fabric comprises a first base fabric and a second base fabric; the first base fabric and second base fabric are respectively prepared by mixing 30-40 parts by mass of polyester fibers with the titer of 1.5-8D, 25-35 parts by mass of waste cotton fibers, 15-20 parts by mass of polypropylene fibers and 15-20 parts by mass of low-melting-point fibers; the first base fabric is compounded with the second base fabric by needle punching; and the needle punching density is 300-500 needles / cm<2>. Compared with the prior art, the thin natural fibers are added to increase the surface density of the nonwoven fabric and reduce the porosity in the nonwoven fabric; and needled felt pieces with different densities and thicknesses are subjected to needling compounding and heat bonding to form the multilayer composite material, thereby obstructing the outside noise while absorbing the interior noise and improving the internal environment more effectively.

The invention discloses a method for preparing heavy metal cadmium stabilizer sulfenyl-ferrous composite modified charcoal and sulfenyl-ferrous composite modified charcoal prepared with the method. The method comprises the following steps: (1) preparing charcoal; (2) preparing a sulfenyl modification solution; (3) preparing a sulfenyl charcoal precursor; (4) preparing the sulfenyl-ferrous composite modified charcoal. The sulfenyl-ferrous composite modified charcoal prepared with the method is not only low in price and good in environmental-friendliness, but also simple in preparation process and easy in large-scale production and application; meanwhile, the content of organic matters in soil is remarkably increased, and the soil fertility is improved; relatively good adsorption, complexing and coprecipitation functions on exchangeable cadmium in soil are achieved, and effective cadmium in the soil can be remarkably immobilized.

The invention discloses a variable-rate feathering shutdown control method for a wind turbine generator set. According to the method, a Beidou positioning system is mainly utilized to monitor the posture of the generator set in real time, the displacement of the engine room movement is acquired in real time, the state of the load borne by the generator set is estimated according to the displacement condition of an engine room, and then the impact load of a tower can be effectively reduced during the shutdown of the generator set through variable-rate feathering shutdown control strategies under different displacements according to the analyzed load condition, so that the generator set is enabled to carry out more stably feathering shutdown, the service life of the generator set is prolonged, and the variable-rate feathering shutdown control method has practical popularization value and is worthy of popularization.

The invention discloses an energy storage power generation system of a wind power generator set and an energy dispatching method of the energy storage power generation system. The energy storage powergeneration system comprises an energy storage unit, a battery management unit, an energy storage bidirectional converter, a boost transformer and an energy management unit, wherein the energy storageunit is used for storing or releasing electric energy, the battery management unit is used for detecting and protecting a battery module in the energy storage unit, the energy storage bidirectional converter is used for converting an alternating current of a power grid to a direct current so as to charge a battery or converting the direct current discharged from the battery to the alternating current sent back to the power grid, the boost transformer is used for connecting the energy storage bidirectional converter and the power grid and rising an output voltage of the energy storage bidirectional converter to a power grid voltage, and the energy management unit is used for sending a control signal to the energy storage bidirectional converter and a master controller of the wind power generator set to do real-time control according to real-time data of the master controller of the wind power generator set, the energy storage unit, the energy storage bidirectional converter and a powergrid dispatching instruction and wind power forecast information of a power forecast system. By the energy storage power generation system, the optimal charge-discharge rate of the energy storage system can be made, the utilization efficiency of the energy storage system is improved, and moreover, the energy storage system is high in control efficiency and rapid in response speed.