A reliable igniter is critical to the efficient and safe operation of a burner; a poor light off can result in significant financial losses. Top-quality horn igniters are designed with reliability in mind. They provide a dependable ignition source that can be configured to use two fuel sources to further increase the flexibility of the unit. A horn igniter has a high-energy spark igniter (HESI) that can provide sufficient ignition energies in the most adverse conditions and also incorporates a self-cleaning function to further improve reliability. A typical horn igniter is shown in Figure 1 below:
A horn igniter is a permanently installed ignition device designed to provide a reliable source of ignition energy to light off a burner. There are three igniter classes that are differentiated by their ignition capacities in relation to full burner load. The Forney horn igniter, in particular, is primarily used as a Class 2 igniter in tangentially fired burners.
Horn igniters typically consist of seven components as listed below and indicated in Figure 2.
Forney horn igniters do not have an eddy plate – thus reducing the buildup of coke near the nozzle and igniter assembly, which improves overall igniter reliability. Table 1 below lists the Forney horn igniter specifications:
A horn igniter works by pumping an atomized fuel mixture into a diffuser or horn by means of a fuel nozzle. The fuel is atomized with the help of pressurized air. A HESI igniter then generates a high-energy spark of up to 12 joules that ignites the atomized fuel mixture. The combustion air is provided via the wind box.
A horn igniter is typically used for igniting tangentially fired burners. Tangentially fired burners are designed to create a turbulent, swirling fuel-air mixture to essentially create a rotational fireball in the boiler. This swirling action also increases the residence time of the fuel, creating optimal combustion.
Igniters can be categorized by their NFPA 85 (Boiler and Combustion Systems Hazards Code) classification. In general, each of the below-listed igniter classes is defined as being designed to ignite the burner fuel under light-off conditions as well as during low load or other adverse operating conditions.
Each class is differentiated by its capacity ranges in relation to full-load burner input. The horn igniter is typically used on Class 1 and Class 2 igniters with either single or dual-fuel configurations. Forney horn igniters, in particular, can also be designed with higher heat rates, depending on specific customer requirements.
The Forney horn igniter offers a wide range of benefits as described below:
Your plant can’t afford to risk using unreliable burner ignition equipment that can result in poor light-off or dangerous conditions within your burner. Forney’s horn igniters are specifically designed for reliability and can accept two different fuels for maximum flexibility. Our igniters are uniquely designed with the needs of plant operators and managers in mind.
To learn more about how our horn igniters can provide reliable and consistent burner ignition for your plant, contact a Forney representative today.
Forney Corporation has over 93 years of experience manufacturing the safest and most reliable combustion equipment for more than 1,000 power plants in more than 100 countries. The quality and durability of Forney’s state-of-the-art front-end combustion components have been proven by customers in many industries across the globe. Forney igniters, burners, BMS, flame detectors, dampers, and duct burners have provided efficiencies and cost savings for plant operators in electric utilities, chemical processing, pulp & paper, and cement industries.