Environmental Engineering Reference
In-Depth Information
TABLE 4.3
Comparison of Characteristics of Various Burners in the Heating Furnace
Items
Axial-Flow Burner
Side Burner
Roof Burner
1.
Burner position
against the furnace
see Figure 4.3d .
see Figure 4.3b
see Figure 4.3c
2.
Fuel
Heavy oil, C gas, M gas,
etc.
Heavy oil, C gas,M gas,
etc.
Kerosene, C gas, M gas,
etc.
3.
Type of burner flame Long flame type
Short flame type (variable
flame type)
High-intensity
combustion radiating
type
4.
Controllability of
specific
combustion
Adjusting range is wide
Adjusting range is narrow
(about 1/2); thinning
control is required
according to the specific
combustion
Adjusting range is
relatively wide
5.
Heating load
Heating load can be
secured by a larger
burner
Heating load can be
secured by a larger burner
Heating load cannot be
secured by a smaller
burner
6.
Restrictions by
furnace inner size
Length per one zone in
the furnace direction is
restricted
Furnace width is restricted No restrictions;
however, combustion
at the lower part is
regarded as wrong
7.
Combustion gas
flow in the furnace
The combustion gas
flows in the furnace
direction without
trouble
A polarized gas flow
occurs easily, as the
burner direction and the
furnace length direction
cross at right angles to
each other
The combustion gas
flows in the furnace
without trouble, since
combustion is carried
out mostly in the
burner tile
8.
Burner mounting
structure to the
furnace
The structure of furnace
body is made
complicated, as nose
parts are required
The furnace body structure
is made simple, since
nose parts are not
required
Although the furnace
body structure is
simple, there are many
burners, and therefore
the pipe arrangement is
made complicated
9.
Uniformity of
heating (heating
pattern)
Heating in the furnace-
width direction is easily
made uniform
Temperature at nose
parts in the furnace
direction is apt to drop
down
Uniformity of heating in
the furnace-width
direction is rather
inferior; heating in the
furnace-length direction
can be easily made
uniform
Uniformity of heating in
both the furnace-width
direction and the
furnace-length
direction can be easily
achieved
 
 
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