US 4,418,649 AGranted

Boiler structure

OwnerJames E. Purvisinventor

Life of this patent

Estimating the term…

Loading patent…

Abstract

A boiler comprising a long tank lying on its side and having a fire box at one end which is adjacent to a recessed bulkhead that is spaced from a partition in the end of the tank. The top of the tank and two sides thereof extend beyond the bulkhead around the fire box to provide water filled side and top portions for the fire box. The other end of the tank has a rear bulkhead which lies adjacent to a hot gas manifold that extends beyond the rear bulkheads to form a hot gas chamber below a smoke stack. The tank has a number of large diameter tubes extending horizontally between and through the two tank bulkheads to conduct hot gases from the fire box to the manifold chamber and smoke stack. Inside the fire box there is a water filled fuel supporting grate connected by a pump to circulate water from the tank, and between the grate and the front bulkhead there is an upright baffle which extends across the fire box and rises toward the overhanging roof portion but leaves a space above the baffle through which hot gases can pass from the fire box into the flue tubes. The fire box is enclosed by a front partition having ash clean-out doors, controllable air vents adjacent to the grate, and two large water filled doors connected to the tank for circulation. A water jacket surrounds the upper part of the manifold chamber. Helical blades are inserted in the flue tubes to cause the hot gases passing therethrough to whirl, and the flue tubes are all provided with butterfly valves which control the rate of flow of the hot gases from the tubes to the smoke stack.

An improved boiler for burning fuel to heat water, comprising:

(a) a horizontal water tank having a rear bulkhead at its rear end, having a second bulkhead which is recessed in the tank spaced from its front end to form a fire box, the second bulkhead extending partway up the height of the tank to leave a top portion of the tank overhanging said fire box and closed by a horizontal plate, the tank having spaced opposed side portions extending on both sides of the fire box from the second bulkhead to the front of the tank, the side and top portions of the tank being substantially water filled and communicating with the water in the tank, and the tank having multiple horizontal flue tubes extending longitudinally through the tank below its center and through the bulkheads and sealed thereto;
(b) a hollow water filled grate in the fire box located between the tank side portions and below its top portion, and means to circulate water from the tank through the grate;
(c) a front partition extending down from said top portion and transversely between said side portions and closing the front of the tank and the fire box, said front partition having doors located between said side portions and disposed for access to the fire box to load fuel on said grate, the doors being water filled and having means to circulate water from the tank through the doors, and the front partition having ash clean-out doors located below said grate;
(d) a gas manifold chamber enclosing said rear bulkhead of the tank and having a smoke stack extending therethrough above the tank;
and
(e) an upright baffle extending transversely across the fire box and located between the grate and the second bulkhead and extending from the bottom of the fire box above the grate to a level higher than the level of the highest flue tube but below the level of said horizontal plate, whereby hot gases from the fire box will collect and mix near the level of the plate in front of the baffle before being drawn downwardly again to enter the flue tubes to the rear of the baffle.

3 more elements

Abstract

Claims18