Smoke tube boiler

A smoke tube boiler comprising:

• a mix chamber which includes a mixing space in which combustion gas and air are mixed, a mix chamber body having a flat shape, and a flat plate-shaped burner disposed in a horizontal direction above a combustion chamber and positioned over an entire area of the mixing space;
• a heat exchanger which includes an outer shell forming an outer wall of a water tank into and from which a heat medium is introduced and discharged and which accommodates the heat medium, a plurality of tubes formed in a flat shape that are configured to allow combustion gas generated in the combustion chamber to flow therein and cause a heat exchange to occur between the combustion gas and the heat medium flowing outside the tubes, turbulators coupled to an inner side of the tube and configured to induce occurrence of a turbulent flow in the flow of the combustion gas, and multi-stage barriers disposed between the outer shell and the tube and configured to induce a heat medium flow direction to be alternately changed between a radially inward direction and a radially outward direction;
• an upper tube plate having an end plate structure that is configured to form the combustion chamber and coupled to an inner side of the outer shell so that a heat medium flow path is formed between the upper tube plate and the outer shell;
• and
• a lower tube plate having an end plate structure that is configured to support a lower end portion of the tube and form a bottom surface of the water tank,
• wherein a space between a lower surface of the mix chamber body and an upper surface of the flat plate-shaped burner is formed in a flat disc shape,
• the smoke tube boiler further comprising:
• a firing rod assembly assembled to pass through one side portion of the mix chamber to one side of the flat plate-shaped burner and configured to extend across an upper portion of the combustion chamber toward a lower side of the flat plate-shaped burner, the firing rod assembly including a firing rod and a flame sensing rod;
• a sealing means configured to block leakage of mixed gas of the mixing space and exhaust gas of the combustion chamber to the outside through a gap between the mix chamber and the firing rod assembly;
• a mix chamber flange and a burner flange are disposed to come into contact with each other at the one side portion of the mix chamber and seal the mixing space, and the firing rod assembly is assembled to pass through the mix chamber flange and the burner flange at a position spaced apart from the mixing space;
• and
• a firing rod coupling plate to which the firing rod is coupled by passing therethrough and a flame sensing rod coupling plate to which the flame sensing rod is coupled by passing therethrough are disposed at an upper portion of the one side portion of the mix chamber;
• wherein the sealing means includes a first sealing member provided at a portion where the mix chamber flange and the burner flange come into contact and configured to prevent leakage of the mixed gas, which is introduced into the mixing space to the outside, a second sealing member provided between the mix chamber flange and the firing rod coupling plate and configured to prevent leakage of exhaust gas, which is generated in the combustion chamber to the outside, and a third sealing member provided between the mix chamber flange and the flame sensing rod coupling plate and configured to prevent leakage of the exhaust gas generated in the combustion chamber to the outside.