Nu-Way MPSR Series Installation & Maintenance Instructions Manual

Installation - Maintenance
MULTIPLEX
SELF RECUPERATIVE gas burner
The Nu-way Multiplex Recuperative System offers the alternative of a self-recuperative burner or a separate
recuperator and burner. the recuperative system is designed to extract expensive waste heat from the flue
products of medium to high temperature industrial processes and to pre-heat the cold combustion air, returning
heat to the process and so considerably reducing the fuel usage. The system is designed for the modernisation
of existing furnaces or for use in new, energy-efficient furnace designs. Applications include forge furnaces,
reheating furnaces, intermittent kilns, soaking pits, heat treatment furnaces, crucible furnaces and indirect
heating processes.
The system nay be used with flue gas entry temperatures up to 1400°C. combustion air makes three passes
through the recuperator to give a high level of heat recovery from the hot gases. Depending on the flue gas
temperature and burner rating, fuel savings of up to 50% or even more may be achieved. The recuperator
design ensures that the combustion air is preheated only by the flue gases and not by the burner or furnace.
Low pressure drops through the system giving reduced horsepower on the combustion air/eductor air fan.
All internal parts of the unit are manufactured from high grade heat resisting materials and the design ensures
that these components are not subject to thermal stress. The design allows for easy dis-assembly to facilitate
inspection, cleaning and replacement of internal sections should the need arise.
The burner section of this package has all the industry proven features and advantages of the Nu-way Multiplex
nozzle-mix burner range. Multiplex nozzles have proven themselves in a total of over 100,000 hours use at
pre-heated air temperatures of 500°C to 650°C. Operation can be on-ratio, excess air or excess fuel. In each
case a wide turndown range can be achieved. A high tunnel exit velocity assures good heat penetration into
the furnace load and prevents "short circuiting" back through the flue.
CONTROLS
As a packaged unit the system design simplifies the control system required. All controls are on the cold side of
the recuperator eliminating the need for costly high temperature air controls. The burner can be manually or
automatically controlled.
proportionator is used. This will ensure close control over a wide turndown and will automatically compensate
for varying back pressures through the recuperator as the air becomes preheated. Existing burner shut-off
systems and combustion air fans can often be re-used and Nu-way will be pleased to advise.
IGNITION AND FLAME FAILURE
Burner may be ignited manually, or by direct spark ignition using the well-proven Multiplex arrangement, and
where required, flame monitoring is provided using an ultra-violet scanner.
MOUNTING
The complete unit is mounted in the furnace wall, installation involves little more than that of fitting a
conventional burner.
For on-ratio control it is recommended that the Nu-way double diaphragm
SERIES
MPSR