Class 2 (2nd Engineer) MEKG 📅 Oct 2025

Exam Question

With reference to main boiler super heater arrangements:

(a) Compare the advantages and disadvantages of contra flow with parallel flow design. (5)

(b) Describe how the element tube banks are supported yet allow for expansion. (6)

Reference Answer

### (a) Comparison of Contra Flow and Parallel Flow Superheater Designs
A superheater's design, particularly the direction of steam flow relative to the hot combustion gases, significantly impacts its performance, efficiency, and material longevity. The two primary configurations are contra-flow and parallel-flow.
#### Contra-Flow Design
In this arrangement, the steam and hot gases flow in opposite directions. The hottest steam at the superheater outlet is exposed to the hottest incoming combustion gases.

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