Paper mill backpressure turbo alternator circuit
This steam circuit turbo alternator diagram shows a backpressure cogeneration set at a paper mill. Returned condensate is deaerated, pumped through an economizer, and converted to superheated steam in a package boiler. Steam at 40 bar and 400 C expands through the turbine, which drives an alternator connected through a generator breaker to the 11 kV plant bus.
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Scenario
A paper mill generates electricity while supplying medium-pressure steam to dryer cylinders. The backpressure turbine makes process heat the turbine exhaust condition rather than rejecting it to a condenser.
Key decisions
- Backpressure set: Turbine exhaust is delivered at 4 bar for useful process heat.
- Steam conditions: The boiler supplies superheated steam at 40 bar and 400 C.
- Electrical isolation: A generator breaker connects the alternator to the 11 kV plant bus.
- Condensate recovery: Dryer condensate returns to the feedwater preparation train.
When to reuse this
Use this for industrial cogeneration sites with a continuous steam demand, such as paper, food, or chemical plants. It is not a condensing power-only turbine arrangement.
Frequently asked questions
Why use a backpressure turbine?
What does the economizer do?
Why include a generator breaker?
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