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Additional Boiler Equipment

Flame Safeguard Equipment

The Flame Safeguard or Programming Control on boilers are designed to ensure that the start-up of the burner follows a definite timed sequence of operation. In addition to the sequence of operation and after the flame has been established, the Flame Safeguard monitors the flame and sets the firing rate of the burner, as determined by the boiler firing rate controls. They also monitor, through the boiler controls, items such as boiler pressure or temperature, fuel pressure or temperature and they provide for normal shut down of the burner if the load demand is satisfied, or shut down and alarm if there is a safety shut down condition.

The Flame Safeguards or Programming Control installed on a boiler can be classified into three categories:

1. Electro Mechanical
2. Solid State Electronic
3. Micro Processor

The electro mechanical controls have been used from around 1950 until 1984. Solid state electronic controls were introduced in 1984. This type of control provides for more alarm or monitoring functions than the electro mechanical controls. The micro processor controls (see Figures 1-28 & 1- 29) introduced in 1989 not only provide the functions as the other controls, but also have the ability to send information to computers and work in conjunction with some energy management systems. The micro processor type of controls are standardly furnished on some of today’s modern boilers.

Stacks

There are numerous types of stacks available. They could be steel stacks with portions material insulated, prefabbed single wall stainless steel, double wall material insulated, double wall air insulated, or triple wall air insulated. See Figure 1-30.

The type of heating equipment to be used, the fuels to be burned, the exhaust temperatures of the equipment, the building use and type of construction materials used have to be considered when a stack is selected. The job-site elevation, site dimensions, the need for an offset, drains, fittings, roof penetration, etc., must also be considered.

O₂ (Oxygen) Trim

An oxygen trim system (see Figure 1-31) is designed to continuously monitor oxygen concentrations in the boiler flue gas and adjust fuel or air flow to maintain the oxygen level at a set point. The system will compensate for changes in ambient air temperature, barometric pressure, humidity and slight variations in fuel characteristics.

Holman Boiler Works has five locations serving Texas and the Southwest:
Dallas / Fort Worth – Houston – Corpus Christi – San Antonio / Austin – McAllen