Vertical Fire Tube Boiler – 50 kg/hr

The vertical 3-pass fire tube boiler is designed to meet the required steam output of 50 kg/hr at an operating pressure of 10 bar. The boiler is engineered with several key components to ensure efficient operation, safety, and control.

Key Components:

  1. Heat Exchanger: The heat exchanger is designed to transfer heat from the combustion gases to the water inside the boiler. This component ensures efficient heat recovery, maximizing the overall thermal efficiency of the system. In the 3-pass design, the flue gases pass through the boiler three times, allowing for optimal heat transfer before the gases are expelled through the stack.
  2. Hot Furnace: The hot furnace serves as the combustion chamber where the fuel—wood pellets, wood fuel, or diesel—is burned. The furnace’s high temperature helps convert the water in the boiler into steam. The combustion process in the furnace generates hot gases that travel through the heat exchanger, releasing their energy to the water inside the tubes.
  3. Cyclone Separator: The cyclone separator is used to remove large particulate matter from the flue gases before they pass through the heat exchanger and ID fan. This component helps improve the efficiency of the system by preventing particulate buildup in the heat exchanger, which could otherwise reduce heat transfer.
  4. ID Fan (Induced Draft Fan): The ID fan is responsible for drawing the combustion gases through the boiler and out of the stack. With a capacity of 45.38 CFM, it helps maintain the required air circulation and ensures the combustion process is efficient, preventing any gases from building up inside the furnace.
  5. FD Fan (Forced Draft Fan): The FD fan, with a capacity of 42.27 CFM, delivers the necessary air to the furnace for the combustion of the fuel. It ensures that the combustion process has sufficient oxygen to burn efficiently and produce the desired steam output.
  6. Water Pump: The water pump circulates water through the boiler system, ensuring a continuous supply to the heat exchanger where it is heated into steam. It maintains the pressure and flow required for consistent steam production.
  7. Heat Economizer: The heat economizer is used to recover waste heat from the exhaust gases before they exit the system. By preheating the incoming water, the economizer increases the overall efficiency of the boiler and reduces fuel consumption.

Temperature and Pressure Regulation Systems:

To ensure safe and efficient operation, the boiler is equipped with several sensors and safety components:

  • Thermal Sensors: These sensors monitor the temperature inside the boiler, particularly in the furnace and the heat exchanger, ensuring that the temperature remains within safe operational limits.
  • Pressure Sensors: Pressure sensors are installed to monitor the steam pressure inside the boiler, which is set to 10 bar for this design. The pressure is carefully controlled to maintain the steam output at optimal levels.
  • Pressure Regulator: This component automatically adjusts the pressure within the system to maintain the desired operating pressure of 10 bar. It helps prevent overpressure conditions that could lead to unsafe operating situations.
  • Safety Valve: A safety valve is incorporated to protect the boiler from excessive pressure. If the pressure exceeds the set limit, the safety valve will release excess steam to prevent damage to the system.
  • Fusible Plug: A fusible plug is included as an additional safety measure. It will melt under high-temperature conditions, allowing the water to escape and preventing the boiler from overheating.
  • Breakdown Valve: The breakdown valve is used to isolate the boiler in case of a malfunction or when routine maintenance is required. It helps ensure safe shutdowns and repairs.
  • Manhole: The manhole is designed for maintenance access, allowing technicians to inspect and clean the boiler components regularly.

Control System:

The overall system is controlled through a PLC (Programmable Logic Controller), which integrates all the components for seamless operation. The PLC monitors and controls the temperature, pressure, fuel consumption, and fan speeds, ensuring that the system operates efficiently and safely. It also provides real-time data to operators, enabling them to track the performance of the boiler and make necessary adjustments.

Operational Data:

  • Required Steam Output: 50 Kg/hr
  • Operating Pressure: 10 bar
  • Power Output/Capacity: 37.1 kW
  • Steam Output Temperature: 179.9°C
  • Wood Fuel Consumption per Hour: 11.22 Kg/hr
  • Pellet Fuel Consumption per Hour: 8.54 Kg/hr
  • Diesel Fuel Consumption per Hour: 3.45 Kg/hr
  • FD Fan Capacity: 42.27 CFM
  • ID Fan Capacity: 45.38 CFM

Additionally, I have designed an Excel-based software that can calculate and size the boiler for any required capacity. This software helps determine key parameters such as fuel consumption, steam output, and component sizing, making it easier to design and optimize boiler systems for different applications.

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