Steam turbine types – power and process heat together Identify the turbine in which part of the steam, after partial expansion, is extracted for process heating while the remaining steam expands further for power generation.

Introduction / Context:
Combined heat and power (CHP) applications use turbine configurations that supply both shaft power and process steam. Understanding the naming and function of these turbines is essential in plant design and energy audits.

Given Data / Assumptions:

• A controlled extraction (pass-out) point exists at an intermediate pressure.
• Remaining steam continues through later stages for additional power.
• Process requires steady steam flow for heating or industrial use.

Concept / Approach:
A pass-out (also called extraction-condensing) turbine deliberately bleeds steam at a set intermediate pressure for process use. The rest of the flow is expanded further to the condenser pressure to generate power efficiently. This differs from a back-pressure turbine where all exhaust steam leaves at process pressure and no condenser is used.

Step-by-Step Solution:
Recognize the phrase “part used for process heating, remainder for power” → controlled extraction.Map terminology: pass-out/extraction turbine provides this function.Therefore, select “pass-out (extraction) turbine.”

Verification / Alternative check:
Plant heat-balance diagrams for CHP units show extraction lines to process headers and continued expansion lines to the condenser, characteristic of extraction turbines.

Why Other Options Are Wrong:

• Back-pressure turbine exhausts all steam for process at high back pressure; it does not continue expansion to a condenser.
• Low-pressure and impulse are generic descriptors without the extraction feature.
• Reheat-only refers to reheating between turbine sections, not extraction for process heat.

Common Pitfalls:
Confusing “bleed” with uncontrolled leakage; pass-out is a controlled, valved extraction at a defined pressure.

Final Answer:
pass-out (extraction) turbine