39results about How to "Change the mode of operation" patented technology

The invention discloses a method for replacing a vibration damper. In the operation method, a bracket and a vibration damper claw hook for replacing the vibration damper are adopted for supporting, so that labor force is reduced, and the labor intensity of operators is reduced; and meanwhile, a bolt is locked and detached by using an electric bolt locking device, so that safety and reliability are achieved, and the function of remote operation can be realized.

The invention relates to a capacitive grounding current distributed compensation method for a medium-voltage power supply system, which belongs to the technical field of the capacitive grounding current compensation of a neutral non-grounding power supply system. In the method, capacitive grounding current distributed compensation transformers are arranged on lines, with relatively greater capacitive grounding currents, of the system in a distributed way, and only compensate the capacitive grounding currents of the corresponding lines, wherein the compensation capacity of each capacitive grounding current distributed compensation transformer is 1.1 times the capacitive grounding currents of the corresponding lines; and 40 to 60 percent of the capacitive grounding currents of the system iscompensated by the capacitive grounding current distributed compensation of the whole power grid, and the other is comprehensively compensated by arc extinguishing devices of transformer substations.The capacitive grounding current distributed compensation method has the advantages that: the capacitive grounding current distributed compensation transformers are adopted, so arrangement is simple and maintenance is unnecessary; operation is simple and the capacitive grounding current is compensated in real time; and the power supply reliability of the power grid is radically improved.

The invention relates to rotors for flow meters, in particular to a toothless triangular rotor for a flow meter. The toothless triangular rotor for the flow meter includes a triangular rotor body; grooves are formed in an upper end surface and a lower end surface of the triangular rotor body; a rotor shaft is positioned in the grooves; and through holes around the rotor shaft are formed in the grooves of the triangular body. The triangular rotor can match a bearing in the metering room through the rotor shaft, and rotation of the rotor can be achieved; the grooves formed in the rotor can reduce the weight of the rotor, and can provide moving gaps for an eccentric bearing disc; and the contradiction of rotation and revolution of the triangular rotor can be skillfully solved during a moving process. The triangular rotor is simple and practical in structure, is easy to manufacture, and can simplify the structure of the metering room.

The invention discloses a double-feed blower fan subsynchronous oscillation inhibition method based on virtual impedance control, and the method comprises the steps: enabling a dq-axis component of a rotor current of a double-feed blower fan to serve as an input signal, and filtering a low-frequency component and a fundamental frequency component through a band-pass filter, and then obtaining a subsynchronous current component. The current component brings virtual impedance to a rotor loop through a proportional amplifier and a differentiation link, thereby achieving the effects of increasing the subsynchronous oscillation damping and inhibiting the subsynchronous oscillation. According to the invention, the method starts from the structure of a rotor controller, achieves the research of the relation between the rotor current and the output voltage of the rotor controller, and obtains the equivalent resistance of a rotor side controller, i.e., the virtual resistance value. Afterwards, a double-feed blower fan rotor current transfer function model is used for solving and obtaining a virtual inductance value needed by the virtual impedance control. The method is advantageous in that the method is simple in parameter configuration, is clear in physical concepts, improves a virtual resistance control strategy, is better in adaptability, is low in control cost, and can effectively inhibit the subsynchronous oscillation to a certain degree.

A novel energy-saving boiler, comprising a hearth (11); the hearth (11) is provided with a furnace tank (12) on the upper part; the furnace tank (12) is provided with a flue pipe (7) therein; the furnace tank (12) is filled with liquid and is provided with a hot water outlet (16) at the top; the hearth (11) is provided with a cold water tank (3) on one side, and an open truncated cone (6) therein; a closed water circulating system is formed in a chamber between an inner surface and an outer surface of the cone; the truncated cone (6) is provided with an evaporator (5) on one side; the upper bottom surface of the truncated cone (6) faces the evaporator (5), and the lower bottom surface faces a front arch (9); the furnace tank (12) is connected to a flue gas heat recovery device (14); and the flue gas heat recovery device (14) is connected to a three-tandem-tower desulphurization precipitator (15). The boiler effectively increases heat absorption area, and has the advantages of high combustion efficiency, fast temperature rise, low exhaust fume temperature, smooth flue gas flow, good comprehensive operation effect and easy maintenance.

The invention relates to a measuring method for rotational inertia of a wind turbine generator unit. The measuring method comprises the following steps that 1 the weather of which the wind speed is stable in the maximum wind energy capture area of the wind turbine generator unit is selected to conduct measurement; 2 an energy-balance equation is established; and 3 the rotational inertia of the wind turbine generator unit is worked out. According to the measuring method for the rotational inertia of the wind turbine generator unit, measurement is conducted in the maximum wind energy capture area of the wind turbine generator unit when the wind speed is stable; the wind turbine generator unit is controlled to operate in a maximum wind energy tracing mode, and first useful output power and a first rotor rotating speed are obtained; the operation mode of the wind turbine generator unit is changed, the useful output power of the wind turbine generator unit is changed into second useful output power, the rotor rotating speed is changed into a second rotor rotating speed, and first output electric energy is obtained, so that the energy-balance equation is established; the rotational inertia of the wind turbine generator unit is determined based on the energy-balance equation. The measuring method for the rotational inertia of the wind turbine generator unit has the advantage of being excellent.

The invention discloses an electric power pumping irrigation station. The electric power pumping irrigation station comprises a machine set, a pipeline and a control system, wherein the machine set pressurizes the pipeline to pump water up; the pipeline provides a water delivery channel, the control system provides power to control starting and stopping of the machine set, controls the pipeline as required and adjusts the rotating speed of a water pump, and the pipeline is a variable pipeline. By adopting the electric power pumping irrigation station disclosed by the invention, the defects that the adjustment ranges of flow and lift are narrow and the requirement of high-low table position irrigated areas on the flow and lift of the pumping irrigation station cannot be met are overcome, irrigation equipment which can meet the requirements of low-table position and high flow and can realize operation in high-table position lift working condition is provided, the operating condition range of the machine set is expanded, the requirement of high flow can be met, operation in high-lift working condition can be realized, and electric power pumping irrigation station is flexible and can perform cross-regional operation, thereby improving the utilization ratio of the machine set.

A boiler air heater optimizing operation control device comprises a temperature sensor PTki installed on an air side inlet of a boiler air heater, a temperature sensor PTko installed on an air side outlet of the air heater, an oxynitride concentration sensor PNOXi installed on an inlet of a boiler SCR denitration system, an oxynitride concentration sensor PNOXo installed on an outlet of the boilerSCR denitration system, differential pressure transducers P delta P installed at the two ends of the smoke side of a boiler air pre-heater, a temperature sensor P theta y installed on an outlet of the smoke side of the air pre-heater, a data acquiring unit and a computer provided with Visual Basic software. According to the boiler air heater optimizing operation control device, the oxynitride concentration on the inlet of the SCR denitration system, the oxynitride concentration on the outlet of the SCR denitration system, the differential pressure on the smoke side of the air pre-heater and other parameters are introduced, the factor that air pre-heater is blocked by running of the denitration system and the too high ammonia escaping rate is taken into consideration and serves as anotherinput parameter for controlling the steam inlet amount of the air heater, the air temperature on the outlet of the air heater is properly raised, so that hydrogen sulfate generated by the denitrationsystem is not prone to congealing on the heat exchanging face of the air pre-heater, and blockage of the air pre-heater is prevented.