(57) Provided is a combustion apparatus with improved thermal efficiency having a combustion
vessel that receives an air supply from the outside to thus burn a fuel that is supplied
from a fuel supply unit, which including: a cylindrical combustion chamber (11) that
is surrounded by an inner wall (12) of the combustion vessel (10) to thus burn a fuel;
a cooling chamber (13) that comprises an intermediate wall (14) that is formed to
be spaced apart from an outer side of the inner wall (12) of the combustion vessel
(10), in which a cooling water inlet and a cooling water outlet through which cooling
water flows in and out, respectively, are formed at lower and upper sides of the intermediate
wall (14), and that is formed at an outer circumference of the combustion chamber
(11), to thereby cool the inner wall (12) of the combustion chamber (11) by the cooling
water that flows into a space formed between the inner and intermediate walls (12,
14) of the cooling chamber (13) through the cooling water inlet; a lateral combustion
air supply chamber (15) that comprises an outer wall (16) that is formed to be spaced
apart from an outer side of the intermediate wall (14) of the cooling chamber (13),
in which a combustion air supply inlet (16a) through which air necessary for combustion
is supplied from the outside is formed at an upper side of the outer wall (16), and
that is formed at an outer circumference of the cooling chamber (13), to thereby make
the air supplied through the combustion air supply inlet (16a) that is formed in a
tangential direction with respect to the cylindrical outer wall (16) turn and fall
in a space formed between the intermediate wall (14) of the cooling chamber (13) and
the outer wall (16) of the lateral combustion air supply chamber (15), so that the
combustion air is supplied to the combustion chamber (11) via an opened lower portion
of the lateral combustion air supply chamber (15) (Fig. 2).
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