1000 mw ultra-supercritical unit feed water control optimization scheme

Abstract: the 1000 mw ultra-supercritical unit feed water control optimization scheme of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. In supercritical and subcritical unit is significant difference between boiler adopts dc furnace) There is no steam drum are the distinctive features of once-through boiler. Once-through boiler is a multiple input and multiple output control object, to meet the once-through boiler the characteristics of dynamic response quickly, small inertia. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a 1000 mw ultra-supercritical unit feed water control optimization article details. In supercritical and subcritical unit is significant difference between boiler adopts dc furnace) There is no steam drum are the distinctive features of once-through boiler. Once-through boiler is a multiple input and multiple output control object, to meet the once-through boiler characteristics of dynamic response quickly, small inertia, side of the boiler control adopts the control strategy of parallel feedforward small deviation adjustment. That boiler main control the output of the parallel to the fuel, air volume, feed water regulation system, on the basis of deviation adjustment, ensure the no deviation when the boiler steady state regulation. Feed water control is ultra supercritical boiler main control difficulty, and subcritical have very big difference. Control system of feed water control task is to keep water flow at low load is not lower than the boiler feed water flow zui low requirements, into dc in boiler operation mode, maintain appropriate fuel water ratio. Here in huadian power international zouxian power plant phase 2 units of 1000 mw ultra-supercritical coal-fired turbine generating unit as an example, introduces the ultra supercritical water supply control system. A boiler feed water system, water supply control object configuration has two 50% capacity of the steam feed water pump, variable speed 1 25% namely BMCR ( Boiler zui large continuous evaporation) The capacity of variable speed electric feed water pump as spare. Steam feed water pump design with high and low pressure steam source two road, automatic switch, including high pressure steam source for the cold reheat steam, low pressure steam source for four period of extraction, plant with auxiliary steam as the start-up and commissioning steam source, small machine exhaust steam to host condenser. Feed water pump control using DCS and Siemens WOODWARD505 controller to control, the controller receives 505 remote control speed signal from DCS, high and low voltage control of the opening of the tone, small machine speed regulation, satisfies the requirement of water supply system. Feed water flow of closed loop control in the DCS, WOODWARD505 controller to realize the pump speed closed-loop control. WOODWARD505 controller using 505 single operation mode, and the 505 operation panel part of the operating function of the operators do in DCS operation, realize remote operations, signal transmission using hardwire and two ways of communication. 505 output control high and low pressure steam source of 2 tone. Normal run time using four smoke to steam, low tone when fully open, four extraction steam source can't meet the needs of the small machine running, high-pressure tone open, into the cold reheat steam. High pressure tone on the system arrangement is small in front of the main steam surface. In front of the main steam of high and low pressure air mixture low tone after entering the turbine. Electric feed water pump by adjusting the hydraulic coupling scoop tube position so as to change the feed water pump speed to change the pump performance curve, making working point, so as to achieve the purpose of regulating the pump flow. Speed control unit spoon tube speed regulating agencies adopt electro-hydraulic servo mechanism. Spoon tube according to the control signal, through the crank and connecting rod drive the sector gear shaft, gear sector and processing in the scoop of mesh on the pipe rack, drive the spoon tube in the working chamber for vertical direction, change the impact of oil inside the hydraulic coupling, realize the output speed stepless adjustment. Spoon tube operation mode using electro-hydraulic servo mechanism, the electro-hydraulic servo system consists of an electromagnetic actuator, a double-acting hydraulic cylinder and a position sensor. Electromagnetic actuators, receive 4-2 oma control signal, and the signal control actuator position, the position of the electro-hydraulic servo system is controlled by a internal electromagnetic valve locator. Signal triggering magnetic controller action. Electromagnetic force is controlled by controlling the hydraulic valve piston to garment. Position detector to detect position difference and feedback signals to the locator, the system can accurately and quickly. So you can make the coupling for 'soft start'. Second, the control scheme of modern large unit are variable speed pump is used to control water flow, zou electric phase iv adopts 2 sets of 1000 mw ultra-supercritical steam main feed water pump, variable speed pump 1 electric feed water pump, feed water pump as a start and used as a system of standby pump. Various types of variable speed pump workspace has its own security, to prevent cavitation of pump and improve the work efficiency of the pump in the control of variable speed pump to by changing the rotational speed, pressure and flow, work to ensure the pump in the safety zone. Pump aso is associated with pressure, when pressure is high, the safety zone range is wide, narrow the scope of the low pressure zone.

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