Brief introduction of mechanical hydraulic speed governing system      

Practice has proved that it is feasible to develop the coordinated control of domestic 200MW units by mechanical hydraulic speed regulating system as long as the inherent defects of synchronizer and governor are eliminated effectively.

The steam turbine unit adopts high speed elastic centrifugal speed sensing device for mechanical hydraulic speed regulating system. The thermal control system is equipped with analog assembly instrument. The unit was put into operation in June 1990. Coordinated control system is coordinated by the main system, the combustion control system and synchronization control system is composed of three parts, the unit load is coordinated by the main system to the synchronous control system by adjusting operation instruction, synchronizer to realize the regulation. The main thermal automatic regulating system of the unit has been improved and perfected after several years of commissioning, and the stable operation has been realized. In order to open the lift lower pressure valve, steam to steam with high pressure distribution cam North redesigned. Because the TBK-2 synchronizer is controlled by industrial computer and stepping motor, the transmission mechanism is simplified, the running inertia and transmission clearance are reduced, and the flexibility and control precision of the action are improved. The control device of TBK-2 synchronizer can accept the coordinated command of the unit, so the unit has the basic conditions for the coordinated control of the commissioning.

The "T" - shaped joint at the top of the synchronizer drive shaft is placed in the groove at the left end of the slide valve, so that the synchronizer is connected with the control slide valve. In order to eliminate the wrong throttle synchronizer governor and transmission mechanism of the swinging gap at the right end of the spool to distribute the hydraulic biasing force of the right end of the drive shaft, the synchronizer throttle and drive mechanism to maintain close contact with the wrong governor. In the static equilibrium state, the offset force on the spool valve is the active force, and the force acting on the slide valve and the control spool valve plays a supporting and balancing role.