CREMATORS
MACROburn Cremators utilise the high standard of technology developed
for MACROburn Incinerators. Many years of experience building tough, rugged,
economical, reliable and smokeless incinerators enabled MACROtec to design
cremators that provide outstanding performance and have an exceptional
life span.
COMBUSTION CHAMBERS
The MACROburn Cremator has five chambers. The coffin, or cadaver in a
bag or shroud, is placed on the hearth in the Phase I Primary Chamber.
After the highly combustible components have burnt away, the remains are
raked down into the Phase II Chamber, where burnout is completed. A second
cremation can be started on the Phase I Hearth during the Phase II
burnout of the first cremation.
Gases from the primary chambers pass through a mixing chamber and tertiary
combustion chamber, where smoke and odours are completely eliminated by
high temperature combustion. The chimney is mounted over the tertiary
combustion chamber. The fifth chamber is a cooling chamber for the ashes.
FUEL & BURNERS
Burners are required for ignition and smoke elimination. MACROburn Cremators
can be fired by diesel oil, towns gas, L.P. gas or natural gas. The burners
have fully automatic start sequence, flame monitoring and shut down. Automatic
temperature controls regulate the auxiliary heat supplied. This ensures
longer refractory life and maximum fuel saving.
OVERVIEW
FLAME INTENSIFIER
The MACROburn Flame Intensifier is a recuperative system for providing
greatly improved combustion efficiency and enormous fuel savings. Fuel
consumption is reduced drastically. Hotter, cleaner flames produce less
unburnt carbon and less smoke. Secondary air is preheated in an antechamber
where heat is collected from the base of the chimney.
CHIMNEYS & FLUES
MACROburn Cremators operate best with top mounted, natural draught chimneys.
We recommend the use of 3CR12 corrosion resisting steel. Such chimneys
do not require refractory lining or insulation. Although mild steel is
quite adequate, it will require more maintenance, Mechanically induced
draught systems can be used and are generally necessary if the cremator
is to be fitted with scrubbers or dry filters. Accurate draught control
is essential. MACROtec manufacture sensors and control dampers specifically
designed for these applications.
AUTOMATIC CONTROL OF AIR & COMBUSTION RATE
An excessive burning rate is immediately and automatically reduced. Conversely
when the burning rate is low, more rapid combustion is induced. Control
is achieved by variations in gas flows and pressures and does not incorporate
any moving or wearing parts.
Automatic air control completely eliminates the necessity for manual operation of air dampers. Quantities of primary and secondary air are constantly varied to suit changing combustion conditions. No moving parts are involved.
Automatic fan controls keep the burner fans running after shutdown. They switch off automatically once the cremator has cooled off sufficiently. This results in longer life for the burner draught tubes, nozzles, diffusers and flame detectors.
Simplified electric control panels on standard MACROburn incinerators are designed for operation by unskilled labour. A single, lockable push-button actuates the starting of all burners, fans, ignition transformers, solenoid valves and control instruments in the correct sequence. Similarly a single push-button actuates the shut down.
Door operated draught reducer automatically reduces the chimney draught while the loading door is open and shuts off the normal air supplies. The resulting reduction in the amount of cold air drawn in through the loading door reduces fly-ash entrainment and thermal shock on the refractory, with resultant longer refractory life.
Explosion relief safety doors swing open in the unlikely event of an explosion. The sliding loading door swings out at the bottom and the blast is directed downwards.
High alumina monolithic refractory linings withstand temperatures in excess of 1500°C and are specially selected to give maximum durability under conditions of sudden and extreme temperature change (thermal shock). The carefully controlled bake-out, which is part of the service supplied by MACROburn agents, ensures optimum linings with a long life expectancy. High quality insulation around the entire cremator ensures low surface temperatures and minimum fuel consumption.
Dry type smoke and fly ash elimination which has proved completely effective, also ensures dry corrosion- free chimney stacks and hot dry gasses that rise straight off the top of the chimney. (No wet, dragging plume.)
The large sliding loading door is at the right height and angle for easy loading or raking. Smooth outer casing free of obstructions is easy to keep clean.
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