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Reconstruction scheme
Condenser pump is one of main auxiliary equipments in turbine system. It brings condensing water to deaerator through heating. Because of constant speed operation, flow only can be controlled by valve. Great throttle loss, high outlet pressure, damage on pipe and low efficiency lead to frequent leakages and energy waste. Furthermore, this kind of mechanic adjustment structure has bad quality, linearity and low switch rate. Frequent adjustments cause lots of faults, which increases maintenance cost and wastes resources.
2 100% capacity condenser pumps are equipped with 300MW generator. Model is 9LDTNA4. Rated flow is 841m3/h. Water lift is 280m. Speed is 1480rpm. Asynchronous motor power is 1000KW. During reconstruction, we add MV inverter to implement stepless adjustment. Power varies with load variety. It heightens efficiency and optimizes operation. Reconstruction complies tenet of "small change, more reliability, best economic benefit".
Advantages: make full use of existing equipment; low cost; keep original control mode same and ensure motor to run in direct on line when inverter is broken; easy maintenance.
Disadvantages: complicated connection; need to add MV breaker; need to add close circuit.
Normal operation: take an example of 51# pump in variable frequency state. Power goes to inverter through 50# switch, then output to 51# motor through 510#. At this time, direct on line switch of 52# is spare. Logics of each switch is following:
Conditions of switch on in direct on line:
Conditions of switch on of inverter
Operation process is following when a pump is broken.
When the pump controlled by inverter is broken, the other pump switches to direct on line automatically (same as original switch mode). When the broken pump is well repaired, it switches to variable frequency state. The spare pump runs only in direct on line, cannot run in variable frequency state.
Condenser pump is one of main auxiliary equipments in turbine system. It brings condensing water to deaerator through heating. Because of constant speed operation, flow only can be controlled by valve. Great throttle loss, high outlet pressure, damage on pipe and low efficiency lead to frequent leakages and energy waste. Furthermore, this kind of mechanic adjustment structure has bad quality, linearity and low switch rate. Frequent adjustments cause lots of faults, which increases maintenance cost and wastes resources.
2 100% capacity condenser pumps are equipped with 300MW generator. Model is 9LDTNA4. Rated flow is 841m3/h. Water lift is 280m. Speed is 1480rpm. Asynchronous motor power is 1000KW. During reconstruction, we add MV inverter to implement stepless adjustment. Power varies with load variety. It heightens efficiency and optimizes operation. Reconstruction complies tenet of "small change, more reliability, best economic benefit".
Advantages: make full use of existing equipment; low cost; keep original control mode same and ensure motor to run in direct on line when inverter is broken; easy maintenance.
Disadvantages: complicated connection; need to add MV breaker; need to add close circuit.
Normal operation: take an example of 51# pump in variable frequency state. Power goes to inverter through 50# switch, then output to 51# motor through 510#. At this time, direct on line switch of 52# is spare. Logics of each switch is following:
Conditions of switch on in direct on line:
Conditions of switch on of inverter
Operation process is following when a pump is broken.
When the pump controlled by inverter is broken, the other pump switches to direct on line automatically (same as original switch mode). When the broken pump is well repaired, it switches to variable frequency state. The spare pump runs only in direct on line, cannot run in variable frequency state.