Steag Energy Services Boiler DCS Engineer Interview Questions and Answers

APH leakage is a problem in boilers that can lead to reduced efficiency and increased emissions.

• APH stands for Air Preheater, which is used to heat the combustion air before it enters the boiler.

• Leakage in the APH can result in loss of heat and reduced efficiency.

• Identifying the leakage involves inspecting the APH for visible signs of damage or leakage, conducting pressure tests, and monitoring performance parameters.

• Common causes of APH leakage include worn-out seals, corros...read more

Desuperheating line is used to reduce the temperature of superheated steam by injecting water or other cooling agents.

• Desuperheating line is typically located downstream of the superheater in a boiler system.

• It is used to control the temperature of the steam to prevent damage to downstream equipment.

• The location of the desuperheating line may vary depending on the specific boiler design and application.

• Examples of desuperheating systems include spray water, steam injection, a...read more

There are eight types of losses in a boiler.

• The eight types of losses in a boiler are: radiation, convection, exhaust, blowdown, incomplete combustion, unburnt fuel, ash, and moisture.

• Radiation loss occurs due to the heat radiated from the boiler's surface.

• Convection loss occurs due to the heat carried away by the flue gases.

• Exhaust loss occurs due to the heat carried away by the exhaust gases.

• Blowdown loss occurs due to the removal of hot water and steam from the boiler.

• Inco...read more

The O2 analiger in a boiler is typically located in the flue gas stream.

• The O2 analiger is used to measure the oxygen content in the flue gas.

• It is important to monitor the oxygen levels in the flue gas to optimize combustion efficiency.

• The O2 analiger is usually installed in the boiler's flue gas duct or stack.

• It may be located at a specific distance from the boiler outlet to ensure accurate measurements.

• The O2 analiger may have a probe that extends into the flue gas stream ...read more

Drum pressure drops in the area of steam generation and distribution.

• Drum pressure drop can occur due to steam leakage in the distribution system.

• Pressure drop can also happen in the steam generation process, such as in the boiler or heat exchanger.

• Other factors that can cause drum pressure drop include fouling or scaling in the system.

• Monitoring and maintaining proper drum pressure is crucial for efficient and safe operation of the boiler system.