Emami Agrotech Ammonia Refrigeration Plant Operator Interview Questions and Answers

A boiler is a closed vessel in which water or other fluid is heated.

• Boilers are used to generate steam or hot water for heating, processing, or power generation

• They can be fueled by natural gas, oil, coal, or electricity

• Boilers have pressure and temperature controls to ensure safe operation

Silica in DM water can cause scaling and corrosion in boiler systems.

• Silica in DM water can lead to scaling on boiler tubes and heat exchangers.

• High levels of silica can also cause corrosion in boiler systems.

• Regular monitoring and treatment of DM water is essential to prevent silica buildup.

• Examples of treatment methods include ion exchange resins and reverse osmosis systems.

Dearetor in chemical dosing % refers to the percentage of chemical dosing in the deaerator system.

• Dearetor in chemical dosing % is the amount of chemical added to the deaerator system to prevent corrosion and scale buildup.

• The percentage of chemical dosing can vary depending on the specific requirements of the system and the type of chemicals being used.

• For example, a typical range for chemical dosing in a deaerator sy...read more

Water wall tubes are typically made of carbon steel, stainless steel, or alloy steel to withstand high temperatures and pressure.

• Water wall tubes are commonly made of carbon steel due to its cost-effectiveness and durability.

• Stainless steel water wall tubes are used in applications where corrosion resistance is important.

• Alloy steel water wall tubes are preferred for high-pressure and high-temperature environments.

• Comm...read more

Super heater tubes are typically made of alloy steel to withstand high temperatures and pressures.

• Super heater tubes are commonly made of materials like T11, T22, T91, etc.

• Alloy steel is preferred for its high temperature and pressure resistance.

• The material composition may vary based on the specific requirements of the boiler system.

Tube failure can occur due to various reasons such as corrosion, erosion, overheating, and mechanical stress.

• Corrosion from water or chemical reactions can weaken the tube material.

• Erosion from high velocity fluid flow can wear down the tube walls.

• Overheating can cause the tube material to weaken and eventually fail.

• Mechanical stress from pressure fluctuations or vibrations can lead to cracks and failures.

• Examples: Cor...read more

Super heater steam speed is the velocity at which steam flows through the super heater tubes.

• Super heater steam speed is typically measured in meters per second or feet per minute.

• Higher steam speeds can increase heat transfer efficiency in the super heater.

• Proper steam speed is crucial to prevent overheating or underheating of the super heater tubes.

Steam drum spare parts include level gauges, safety valves, blowdown valves, and pressure switches.

• Level gauges

• Safety valves

• Blowdown valves

• Pressure switches

Total moisture in coal refers to the moisture content present in coal including both surface moisture and inherent moisture.

• Total moisture in coal is the sum of surface moisture and inherent moisture.

• Surface moisture is the moisture present on the surface of coal particles, while inherent moisture is the moisture contained within the coal itself.

• Total moisture affects the calorific value and combustion efficiency of co...read more

Slop in total oxygen % refers to the amount of oxygen present in the slop being used in the boiler operation.

• Slop in total oxygen % is an important parameter to monitor in boiler operation as it affects combustion efficiency.

• High levels of oxygen in slop can indicate incomplete combustion, leading to energy loss and increased emissions.

• Regular monitoring and adjustment of oxygen levels in slop can help optimize boiler

ROI is a financial metric used to evaluate the efficiency of an investment. It is calculated by dividing the net profit by the cost of the investment.

• Calculate the net profit by subtracting the total costs from the total revenue generated by the distributor.

• Divide the net profit by the total cost of the investment.

• Multiply the result by 100 to get the ROI percentage.

• For example, if a distributor generates $100,000 in r...read more