CWNS Oil Gas Fired Hot Water Boiler

In constructing the CWNS oil gas-fired hot water boiler, the horizontal type three-pass design increases the reliability of the system by providing better operational efficiency. In this design, the flue gases are routed through the furnace and the smoke pipe three times, and this superpass construction helps the boiler achieve even more reliable operation. The efficiency of the boiler is enhanced by the large combustion space and the internal combustion system. The exhaust smoke is minimized, and steady operation for a long time is achieved.

The safety protection devices installed in the CWNS series boilers are designed to guarantee the safety of the boilers and to help prevent issues of overtemperature and overpressure. In the series of protection safety devices, there are pressure valves, interlock protection valves, and the addition of a cut off valves for low water. All of these devices, in conjunction, help to ensure safe water operation, and if water reaches dangerously low levels, combustion is stopped, and so is the feed system. These systems help to ensure personnel safety, as well as the safety of the equipment in the case of a malfunction.

In the design of CWNS oil gas-fired hot water boilers, large diameter corrugated furnaces help increase the turbulent flow and the surface area available for heat absorption. A well designed furnace liner minimizes the impact of high-temperature smoke on the shell and concentrates the heat on the liner. Together these features improve heat transfer efficiency, minimize hot spots and improve the life of the components subjected to the harsh internal combustion environment.

In regard to electric leakage, the boilers have properly designed grounding, insulation, and routine electrical inspections, while flameout protection is provided by systems that combine flame detectors and fuel flow interruption valves, which are part of the interlock protection systems. When flame-out occurs, the interlock protection system stops the fuel flow, shorts the ignition circuits, and starts the safe shutdown of the boiler to avoid an unsafe condition with fuel and to allow the system to be safely and reliably restarted after the troubleshooting is complete.

CWNS series boiler manufacturers offer options to modify a boiler based on customer needs, including different types of burners, control systems, manhole locations, and maintenance accessory packages. Customization aids strong load adaptability by making burners and control logic options selectable to load patterns to achieve safe operation at variable demand while using efficient protective devices.

Welds should be periodically maintained by checking for cracks and corrosion, cleaning of the small pipe and passages of the exhaust, checking the large diameter corrugated furnace and liner of the furnace, testing the interlock protection and flameout, and checking manhole seals. After installation, debug procedures include testing of pressure, tuning of the burners, an analysis of the combustion, and checks of protective devices to ensure the boiler performs to the specifications and operates reliably.

In a three-return (horizontal type three pass) design, the exhaust gases have to pass through the smoke pipes and return through the passages multiple times. This decreases the temperature of the exhaust gases and increases the extraction of heat. When smoke pipes are sized and routed correctly, this helps to maintain a draft and prevents the high-temperature gases from damaging the ductwork. This helps reduce overall fuel consumption and aids in meeting the standards of smoke and emissions control.

Low water can be caused by a failure of the feedwater pump, leaks, closed supply valves, and water being reduced due to scale buildup. When low water conditions exist, CWNS oil gas-fired hot water boilers automatically include low water cut-offs and interlock protections, which stop the burners and lock out the entire system. To avoid low water situations, operators should adhere to scheduled maintenance, look for leaks, and check the calibration of the sensors implemented to ensure a safe restart after the cause of the low water conditions has been addressed.

Manhole ports ensure safe access for the internal inspection and weld checking, cleaning of the large combustion space, and maintenance of the liner and internal combustion surfaces of the furnace. A large space of the combustion chamber aids in the removal of combustion chamber soot and other deposits, inspection of the internal welds and other internals, and repair work without excessive disassembly. Access manholes are critical for the maintenance of the performance and protective safety devices and the reliability of the equipment for the long term.