31results about How to "Reduce wild swings" patented technology

The invention relates to a control method for tracking maximal power and coordinating bus-bar voltage of a mixing excitation wind power generation system, by regulating exciting current of the exciter. The exciting current is composed of a dynamic component and a steady state component. Not only dynamic response is good, but algorithm is simple and practical and convenient for implementing. Due to the exciting current of the exciter is needed to regulated, the energy effect of magnetic field control being high, the capacity of excitation controller being small, cost being low and reliability being high.

The invention discloses an energy saving device for an elevator, which comprises an energy storing device (20), an energy storing device state detector (21), a charging and discharging circuit (19) and an energy storing device controller (22), wherein the energy storing device controller (22) controls the charging and discharging circuit (19) in an allowable range of the energy storing device (20) and the charging and discharging circuit (19) according to the bus voltage and the reference value of the bus voltage, and in addition, the reference value of the bus voltage is variable according to the charging state and/or the charging state change of the energy storing device (20). The energy saving device for the elevator has the advantages that the energy saving of the elevator can be realized, and simultaneously, the severe fluctuation of the bus voltage can be effectively retarded, so the control performance of a motor of the elevator is improved.

The invention especially relates to a method for preparing polyisocyanate through a photochemical reaction, and a method for preparing waterborne polyurethane resin, belonging to technical field of waterborne polyurethane resin. The method for preparing the waterborne polyurethane resin comprises a step of carrying out a polymerization reaction on raw materials containing polyisocyanate, oligomerpolyol, a chain extender and a hydrophilic agent to obtain the waterborne polyurethane resin, wherein the content of benzophenone impurities in the polyisocyanate is less than or equal to 0.045 wt%. By controlling the content of benzophenone impurities in the preparation process of polyisocyanate, the yellowing resistance of the waterborne polyurethane resin can be effectively improved, and harm to the qualified rate of downstream products caused by existence of the impurities in the waterborne polyurethane resin is also reduced.

The invention discloses a top plug-in type spray gun for ventilating and slag gathering and a preparation method thereof. The spray gun comprises a connection segment, a gun body segment and a spray segment which are in successive communication; the spray segment consists of a spray-segment air chamber enclosed at the end, a spray-segment V-shaped anchoring piece and a spray-segment refractory castable; the sidewall of the spray-segment air chamber is provided with dispersion-type nozzles perpendicular to the axis of the sidewall; and the included angle of the center axes of two dispersion-type nozzles at the outermost side is less than 150 DEG. The method comprises: firstly processing and preparing all metal parts of the spray gun according to structural parameters of the to-be prepared spray gun, and removing rust; then preparing and obtaining the spray segment, communicating a main pipe of the gun body segment with the spray-segment air chamber through welding; and selecting steel fiber reinforced corundum mullite castable to perform casting molding, so as to obtain the spray gun. The provided spray gun preparation method guarantees smooth preparation of the spray gun, the structure dimension precision of the spray gun, unblocked gas injection channel and metal structure airtightness, and helps to improve the internal quality and the usage performance of the spray gun.

The invention discloses a waste gas incinerator which comprises a hearth, a heat accumulation pipe, a heater, an air inlet, an air outlet and a smoke cooler. An upper sealing end plate is arranged at the upper portion of the interior of the hearth. An upper portion air passing space is formed in the sealed space defined by the upper sealing end plate and the inner wall of the hearth. A lower sealing end plate is arranged at the lower portion of the interior of the hearth, and a lower portion air passing space is formed in the space defined by the lower sealing end plate and the inner wall of the hearth. Waste gas and smoke conduct heat exchange through the wall of the heat accumulation pipe so that the two kinds of gases cannot be mixed mutually, and the waste gas incinerator does not need to switch the flow directions of waste gas and smoke in turns to complete the heat exchange process of heat accumulation and heat releasing like a traditional heat accumulation incinerator. The heat accumulation pipe in the hearth has good thermal capacity and heat conductivity, fast heat absorbing and releasing can be achieved due to the good heat accumulation performance of the heat accumulation pipe, and acute fluctuation of the temperature of the hearth is reduced.

The invention discloses a control system of a supercapacitor energy storage device, which comprises an energy storage module, a power circuit module, a circuit switch module, a circuit switch control module, a control circuit module and a sampling module, wherein the energy storage module is connected with the power circuit module, the power circuit module is connected with the circuit switch module, the circuit switch module is connected with the circuit switch control module, the circuit switch control module is connected with the control circuit module, the control circuit module is connected with the sampling module, and the sampling module is connected with the energy storage module, the power circuit module and the circuit switch module. According to the invention, real-time sampling is carried out on operating conditions of each module in the system through the sampling module, the control circuit module gives out a control instruction according to a real-time sampling result of the sampling module, and the energy storage module is controlled to carry out charging, discharging or being in a standby state, thereby realizing the purposes of energy recovery, storage and reutilization.