Patent ID: 8631769

Claim:
A firetube steam boiler used for steam generation using a heat source affixed to the boiler distributing heated flue gas into the boiler, the boiler comprising: a housing having a proximal end and a distal end, the housing having a water-entry port; a plurality of firetubes disposed in the housing and substantially extending the length of the housing between the proximal end and the distal end, the firetubes passing the heated flue gas through the housing; a pair of side baffles positioned inside the housing and extending along at least a portion of the length of the housing, the side baffle separating at least a portion of the plurality of firetubes proximate the housing from the remaining firetubes in the housing to define a separated part of the housing; and at least two longitudinal baffles positioned in the separated part of the housing between the distal end and the proximal end of the housing, the longitudinal baffles directing the flow of water opposite to the direction of flue gasses in the separated part of the housing.