Controls for the boiler play a crucial role in the boiler’s overall operation. Their primary function is to monitor and sustain conditions that require constant attention, such as steam pressure and temperature. Different forms exist based on factors including portability, physical appearance, and ease of usage. You can choose from a variety of features, including summarising, rate indication or control, chart recording, and data logging. You can use the analogue knobs and buttons or the digital user interface screen to operate the device. Many manufacturers now supply controllers that are programmable by computer, have internet connectivity, and are ready to be used in a network environment. It’s possible to find a wide selection of boiler controls on the market.
A List of Boiler Control Types
Here we detail not just the various controls but also their functions:-
Operation Controls
Depending on the required pressure volume or the temperature of the system, they will either turn on or turn off the burner. The burner is re-ignited at the (higher) operational set point, which is controlled by the controller by adjusting the divergence setting for each layer individually.
Combustion Air Establishing Switch
This switch guarantees adequate combustion air by turning on the fan that moves that air. Place this on the air plenum just before the blasting pipe of the gun burner. The burner’s on/off switch is located on the front head, which also serves as the air plenum. The switch is open when the burner is not in pre-purge mode but closes when the pressure in the air plenum rises. While the fan is on, the entrance is sealed off.
High-Limit Control
The system regulates high pressure. This control’s fixed differential is located above the operational cutoff. When the desired temperature is reached, the switch remains closed and cuts power to the control circuit. Power to the burner is cut off immediately in the event of a high-pressure incident or operational control failure, and the control must be manually reset before the burner can be turned back on.
Low-Gas Pressure Switch
This means that the burner is receiving the optimal gas flow for maximum input. It also ensures a constant rate of flow through the burner orifices, resulting in superior blending. Raw gas may become trapped in pockets if the flow rate is too low, which might cause unpredictable and potentially dangerous re-ignitions.
High-Gas Pressure Switch
This switch shuts off the burner if it gets too hot, avoiding a potentially dangerous overheating condition. This switch, located below the gas control valve or valves, performs the opposite action of the LGPS. When the gas pressure is raised over its operational set point—higher than in the low gas pressure configuration and higher than in normal operating gas pressure—the valve opens to allow full input.
Low-Oil Pressure Switch
The pressure threshold is checked by a switch to see if it is possible to generate input. Furthermore, it helps guarantee efficient nozzle blending and prevents oil from collecting in the fuel.
High-Oil Pressure Switch
It’s a supplement to the existing low-oil-pressure indicator. When the force is increased beyond the normal operating force, it performs similarly to the high-gas pressure button. Prevents the burner from receiving an excessive amount of oil that isn’t properly mixed with combustion air, which could cause excessive sooting, pooling, and possibly even an explosion.
Atomising Air Proving Switch
Complete atomisation of the oil for a cleaner burn is achieved by AAPS because air is added to pressurised mechanical atomisation. Compressed air is used throughout the system, and it might come from either the main plant or a separate compressor installed adjacent to the burner.
SUMMING UP
After reading this, you should have a good grasp of the many types and purposes of boiler controls and boiler parts. These components are crucial for the efficient operation of boilers.