Difficulty: Medium
Correct Answer: Blast furnace stove
Explanation:
Introduction / Context: Draught systems move combustion gases through furnaces. Many modern units use induced-draught (ID) fans to pull flue gases, stabilizing furnace pressure and improving control. Some traditional furnaces, however, often rely primarily on natural draught via a stack.
Given Data / Assumptions:
Concept / Approach: High-pressure boilers commonly use ID fans for tight pressure control and heat-recovery train performance. Sintering furnaces likewise use strong suction for gas flow through the bed. Blast furnace stoves, in classical layouts, frequently depend on chimney natural draught and cycling valves; while fans can be present in modern plants, they are not the textbook example of induced-draught operation.
Step-by-Step Solution:
Review typical equipment: boilers and sinter plants normally have ID fans.Stoves operate regeneratively with valve cycles; traditional designs rely largely on stack effect.Thus select “Blast furnace stove” as not typically induced-draught.Verification / Alternative check: Process schematics show ID fans on boilers and sinter strands. Stove diagrams focus on checkerwork, burners, and chimneys rather than obligatory ID fans.
Why Other Options Are Wrong:
Sintering furnace: Needs strong suction through bed—classic ID application.High pressure boiler: Standard ID/FD fan arrangements are common.None of these: Incorrect because at least one listed item (stove) is not typically ID-driven.Common Pitfalls: Assuming every modern furnace has ID; some legacy or specific regenerators rely on natural draught.
Final Answer: Blast furnace stove
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