The matters of attention in the thermal power unit RB control strategy and its test

Abstract: the thermal power unit RB control strategy and the matters needing attention in the information of the experiment by excellent flow meter, flow meter production factory to provide you with quotation. The RB, RB control function control is the basic way of RB occurred after the unit control by tracking control mode switch to the steam turbine coordinate ( TF) Mode, and automatically into sliding pressure operation mode, boiler master control and manual control mode, cutting fuel master automatic control side. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the matters of attention in the thermal power unit RB control strategy and its test article details. The RB, RB control function control is the basic way of RB occurred after the unit control by tracking control mode switch to the steam turbine coordinate ( TF) Mode, and automatically into sliding pressure operation mode, boiler master control and manual control mode, cutting fuel master automatic control mode, coal feeder output target for RB condition load corresponding to the amount of fuel, steam turbine side RB target load should be maintained by the steam turbine master control sliding pressure steam cure his line 9. If the control system with digital electro-hydraulic control system ( DEH RB interface logic, is according to the main steam pressure value and its deviation adjusting steam turbine control valve opening. At the end of the process of RB, control keep the TF methods ( Most of the control system using this way, individual investment coordination control is adopted in the system or the steam turbine and boiler master control switch for manual control mode) 。 All the control function of the unit RB basically by the analog control system ( MCS) And the burner management system ( BMS) Joint implementation. BMS according to adjust the volume of fuel RB control requirements. Usually, at the end of the MCS includes RB signal generation, state logic unit, zui big output, target load corresponding to the fuel quantity calculation, coordination control mode switch, main steam pressure control mode switch, load/pressure relationship curve is set up, the main ( Again) Steam temperature drop rate calculation, Used for blocking the change of main steam pressure setting) , send/induced draft fan damper feedforward quantity calculation, prevent to send/induced draft fan motor over-current atresia logic, after the occurrence of RB shielding each subsystem ( Supply air and the wind, a wind and water) A big deviation control signal switch to manual control logic, machine atresia reduction furnace load instruction shielding logic, ( Again) Heat exchanger to reduce temperature regulator and shutoff valve control loop closed logical RB control circuit, etc. Second, RB control strategy 1, send/induced draft fan balance control blower RB or induced draft fan RB has two kinds of control strategies. Tripping interlock trip ipsilateral lead/send/induced draft fan blower, and reduced to 50%, the output of generating unit send/run after the occurrence of induced draft fan RB to send/induced draft fan in the original efforts through balancing logic on quickly to increase its output, on the premise of guarantee delivery to maintain the stability of the chamber of a stove or furnace negative pressure; Your trip/induced draft fan is not interlock trip ipsilateral/blower, blower RB occurred after two regulating mechanism of induced draft fan running according to certain proportion reduce override the opening, the adjusting mechanism of the running single blower override open ( Induced draft fan RB control) To guarantee the stability of the chamber of a stove or furnace negative pressure. Send/induced draft fan override action selection and the proportion of single fan the regulating mechanism of override open baffle rate limit and zui limits, should be on the premise of guarantee the fan output fan motor over-current trip to avoid boiler fuel trip ( MFT） 。 2, feed water pump, a fan override control in the feed water pump RB and RB control, a fan asked the operation of a single feed pump rapidly increasing output, quickly open the single running a fan regulator to maintain a wind pipe pressure, avoid running coal mill trip. Usually, use the regulator output instruction or the opening of the actuator balance feedback design logic for RB single run after onset of feed water pump, a fan for override control actuator. In addition, some units have established state regulator switching control mode, in RB regulator output fixed opening instructions for quick open a single run of feed water pump, a fan actuators. 3 and the furnace water circulation pump RB control of forced circulation drum boiler of 600 mw unit USES three furnace water circulating pump, some units as a result of the furnace water circulation pump output is small, the unit of water circulation pump under normal operation condition 3 boiler running at the same time, if one furnace water circulation pump tripping or 1 running furnace water circulating pump of inward and outward sent down, will cause the RB unit. Found in the RB test furnace water circulation pump, two running furnace water circulating pump of inward and outward difference down signal poor reliability ( Signal fluctuations) , zui big load of the unit load with the zero switching between the RB target, making coal in volatility.

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