Stoves and furnaces – Stoves – Heating
Patent
1983-06-23
1986-04-08
Scott, Samuel
Stoves and furnaces
Stoves
Heating
126 77, 126290, 110214, 110203, 422176, F23L 1302
Patent
active
045805466
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention pertains to the art of fuel burning devices and, more particularly, to a fuel burning device including an oxidation catalyst.
The invention is particularly applicable to woodburning stoves. The invention can be readily used in other fuel burning appliances in which an oxidation catalyst is employed, particularly in other solid fuel appliances.
It is highly desirable to control the temperature at which combustion occurs in the stove. When combustion occurs within the optimum range for heating a room to a desired temperature, the inhabitants of the room will be as comfortable as possible; clearly this will not be the case if the combustion occurs at a higher or a lower temperature or if its temperature oscillates widely. If the combustion temperature is too high, in addition to causing discomfort, the stove will consume more fuel than is necessary. In addition, with the stove at a high temperature, there is a danger of chimney fire due to high stack temperatures which are produced. Finally, an unnecessarily hot stove increases the danger of a person in the room suffering a severe burn from accidentally touching it or the stove igniting something flammable which is near the stove.
If the stove combustion temperature is too low, on the other hand, efficiency is again reduced, excessive CO and creosote is formed and there is a danger that the fire will go out, presenting the inconvenience of having to restart it.
Woodburning stoves equipped with thermostats which attempt to maintain the combustion temperature at the desired level are known. Such a stove is disclosed in U.S. Pat. No. 4,117,824, issued Oct. 3, 1978, to McIntire et al. In the McIntire et al patent, a damper is mounted in an air intake and can be rotated about its edge to control the quantity of air supplied to the stove combustion chamber. This controls the combustion temperature. A bimetallic coil is provided outside the air intake duct. One end of the coil is connected to the damper, and the other end of the coil is connected to a control knob. When the coil heats as a result of a rise in the stove temperature, it rotates and moves the damper in the closed direction. Conversely, a drop in the stove temperature as measured by the bimetallic coil results in the damper being opened further. The position of the damper can also be controlled manually by turning the control knob.
The combustion temperature in wood burning stoves with known thermostats typically exhibits oscillations of a very large amplitude, often reaching 70.degree.-300.degree. F. This is because known thermostats typically are not sufficiently sensitive to changes in the stove temperature. Such thermostats generally respond to temperature changes only very slowly and display a response that is very small in magnitude. As a result, by the time the thermostat reduces the air supply responsive to a temperature rise, the temperature has risen very high, and the amount of the reduction in the air supply is correspondingly large. Because of this, the combustion temperature falls dramatically. Due to its relative insensitivity, however, the thermostat detects the temperature drop only after the temperature has fallen as much as 70.degree.-300.degree. F. below its peak. The thermostat responds by drastically increasing the air supply, allowing the combustion temperature to rise very quickly to a new peak. As a result, the stove temperature oscillates wildly, instead of remaining at a stable level.
A stove controlled by such a thermostat thus reaches temperatures both substantially higher and substantially lower than the optimum combustion temperature and accordingly presents many of the risks and suffers from many of the drawbacks of manually controlled stoves.
Conventional woodburning stoves, fireboxes or fireplaces do not burn all the combustible substances of a conventional fuel such as wood. The smoke and gas effluent of a wood fire normally contains creosotes and substantial quantities of oxidizable substances such as combustible gases. Such
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Condar Co.
Odar Helen Ann
Scott Samuel
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