Low NOX and CO emissions direct contact high temperature water h

Details Low NOX and CO emissions direct contact high temperature water h Low NOX and CO emissions direct contact high temperature water h

1997-06-13

1998-05-12

Dority, Carroll B.

Stoves and furnaces

Liquid heater

Fluid fuel burner for other than top-accessible vessel

F24H 110

Patent

active

057493561

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a low NOX and CO emission gas-fired water heater wherein water droplets are heated by direct contact with a packing, the inner surface of the heater housing, and in the space within the housing.


BACKGROUND ART

Direct contact water heaters are known such as described in U.S. Pat. No. 5,293,861 assigned to Sofame Inc. wherein water is heated in a cylindrical column containing one or more packings of heat exchange elements which are heated by hot-air from a gas-fired burner located there below. The flame is introduced through a side wall of a cylindrical column containing the packing. With such water heater construction it is necessary to insulate the burner housing which is mounted adjacent the side wall of the burner. It is also desirable with such heater housings to provide a double wall cylindrical housing with cooling water interposed therebetween. Such water heaters are capable of heating water up to about 185.degree. F. with NOX emissions below 40 ppm at 3% O.sub.2 and CO emissions lower than 200 ppm.


DISCLOSURE OF THE INVENTION

There exists a need to provide a gas-fired water heater of the above-described type and wherein the NOX and CO emissions can still be lowered to those levels achieved by the above referred to direct contact water heater and wherein the housing can be constructed in a more economical manner by eliminating the need to insulate the side wall of the housing as well as the burner housing.
It is therefore a feature of the present invention to provide a gas-fired water heater which provides the above need.
According to a further feature of the present invention there is provided a gas-fired water heater of the column type and wherein the burner is axially supported within a vertically oriented cylindrical housing and disposed under a heat exchange packing.
Another feature of the present invention is to provide a gas-fired water heater wherein the burner feed pipe extends axially within the column and partly through the heat exchange packing wherein the gas mixture within the feed pipe is cooled by the packing to prevent flashback in the feed pipe.
Another feature of the present invention is to provide a gas-fired water heater and wherein the side wall of the column housing is cooled by water in contact with is inner surface and propagating from the top part of the column to a collecting reservoir in the bottom thereof.
Another feature of the present invention is to provide a gas-fired water heater wherein an axially supported burner is disposed under a heat exchange packing provided in an upper region of a vertically oriented cylindrical housing and wherein the burner has a cylindrical head which generates a short circumferential flame about the head side wall and wherein a deflector is provided above the flame to prevent water droplets from direct contact therewith to diminish CO emission by water contacting the flame.
According to the above features, from a broad aspect, the present invention provides a gas-fired water heater which comprises a vertical elongated housing having a circumferential side wall, a closed bottom end, and a flue connected to a top end portion thereof. A packing of heat exchange elements is supported inside the housing in an uppermost region thereof. Water discharge means is disposed above the packing and connected to a water supply for releasing water on the packing. An axially supported burner is disposed substantially centrally within the housing under the packing. A feed pipe is connected to the burner and extends at least partly axially within the housing. A gas-air mixture is fed to the burner through the feed pipe. Ignition means is provided to ignite the burner. The water released by the discharge means is heated by contact with the packing, the inner surface of the housing and in a space below the packing during the gravitational displacement of water droplets from the discharge means to a collection means below the burner where heated water is collected.


BRIEF DESCRIPTION OF DRAWINGS

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REFERENCES:
patent: 3826240 (1974-07-01), Miyahara
patent: 5293816 (1994-03-01), Manderville et al.
PCT WO 83/00210 Wood 20 Jan. 1983.

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