Exam Question
Make a diagrammatic sketch of an exhaust gas boiler. Describe its construction and explain how it is maintained in a efficient condition (16)
Class 4 (4th Engineer)
MEKG
📅 Aug 2023
Reference Answer
### **1. Introduction**
An exhaust gas boiler (EGB), often referred to as a waste heat recovery boiler, is a critical component for improving the overall thermal efficiency of a modern motor ship. It utilizes the high-temperature exhaust gases from the main engine, which would otherwise be wasted, to generate steam for various onboard purposes such as fuel heating, domestic services, and sometimes for turbo-generators.
A common and versatile design, as mentioned in the provided context, is the **Composite Boiler**. This unit combines an exhaust gas heat exchanger and a conventional oil-fired boiler within a single shell. This arrangement allows for steam generation even when the main engine is stopped or at low load, ensuring a continuous and reliable steam supply.
### **2. Construction of a Composite Exhaust Gas Boiler**
An exhaust gas boiler (EGB), often referred to as a waste heat recovery boiler, is a critical component for improving the overall thermal efficiency of a modern motor ship. It utilizes the high-temperature exhaust gases from the main engine, which would otherwise be wasted, to generate steam for various onboard purposes such as fuel heating, domestic services, and sometimes for turbo-generators.
A common and versatile design, as mentioned in the provided context, is the **Composite Boiler**. This unit combines an exhaust gas heat exchanger and a conventional oil-fired boiler within a single shell. This arrangement allows for steam generation even when the main engine is stopped or at low load, ensuring a continuous and reliable steam supply.
### **2. Construction of a Composite Exhaust Gas Boiler**
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