JPH06147414A - Pot type oil burner - Google Patents

Abstract

PURPOSE:To make stable combustion possible when a burner is operated with small heating power by providing a flame retaining ring tapering downward at the upper edge of a side wall of a pot and opposing the end of an opening at the central part of the flame holding ring to the underside of air vents disposed in the uppermost step row of the pot. CONSTITUTION:Air fed through air vents 1a in the uppermost step row impinges on the backside of a taper portion 4a of a flame retaining ring 4, which tapers downward. and is guided obliquely downward to be well mixed with combustion gas ascending in a pot 2 to serve for carrying out complete combustion. Further, since the taper portion 48 or the flame retaining ring 4 is provided at a position close to flames and absorbs heat of flames to lower a flame temperature, the amount of phenol NOx to be generated is also decreased. By this method, stable combustion can be carried out even when a burner is operated with small heating power (500 to 600kcal/h).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pot type petroleum combustor, and it is intended to reduce the amount of nitrogen oxides generated and stable combustion at a low thermal power.

[0002]

2. Description of the Related Art Conventionally, a pot type oil combustor for supplying fuel into a pot installed in an air passage and evaporating and burning in the pot has been known for a long time, and a mixture of fuel and combustion air in the pot is known. In order to improve the temperature, it is known that a pilot ring, a combustion ring, an auxiliary combustion member called by a name such as a blue flame cap are provided in the pot, or a flame holding ring formed of a flat plate is provided on the upper edge of the pot side wall. .

[0003]

In the conventional pot type oil combustor, the combustion air and the fuel gas are satisfactorily mixed when the maximum heat quantity or the combustion quantity close to it (large thermal power) determined by the design specifications. It burns normally without any problems.

In recent housing and climate conditions, after the indoor temperature rises to a predetermined temperature, a small thermal power (1000 Kc
It was found that there are many cases of continuous use at about (al / h 2) and it became necessary to carry out stable combustion even with small thermal power.

The pot type oil combustor has a drawback that the concentration of vaporized gas is small at the time of minute combustion and it is difficult to mix with secondary air. In order to solve this problem, various rings of an auxiliary combustion member are used. We have made various efforts such as changing the position and adding steps, but recently, the desired value of micro heat power has decreased more and more, and the demand of 500 to 600 Kcal / h has come out, and there is no mechanism to respond to this. is the current situation.

[0006]

In order to solve the problems of the prior art, the present invention provides a pot 2 having a large number of air holes 1 on its side wall, and an opening 3 in the central portion at the upper edge of the side wall of the pot 2. The flame holding ring 4 is connected to the flame holding ring 4, and the flame holding ring 4 has a taper portion 4a which is downwardly lowered toward the opening 3 in the central portion, and the opening 3 is formed on the side wall of the pot 2 below the uppermost row air holes 1a.
It is a pot type oil combustor in which the end of is positioned.

[0007]

The pot-type combustor is provided with a primary air mixing chamber A below a pilot ring 10 provided on the side wall of the pot 2 in the middle thereof.
In the first step, combustion is started by the heat of the preheating / ignition heater 9.

When continuous combustion starts, in the primary air mixing chamber A, vaporization of fuel and mixing of combustion air (air from the lower air holes 1c) (primary combustion) are mainly performed, and the primary air mixing chamber A rises. The flame to be squeezed inward once by the pilot ring 10, then the blue flame cap 11 in the center of the pot 2.
At the central air hole 1b on the side of the blue flame cap 11 in the secondary combustion chamber B above the pilot ring 10.
Combustion is accelerated by the secondary air supplied from the uppermost row air holes 1a, and when the thermal power is large, the tip of the flame extends above the flame holding ring 4 and the combustion ends. In addition, at the time of minute combustion in which the supply of fuel is restricted, it is usual to finish the combustion around the blue flame cap 11.

The air supplied from the uppermost air holes 1a of the pot 2 to the secondary combustion chamber B rises from the primary air mixing chamber A along the back side of the taper portion 4a of the flame holding ring 4. It progresses in a form orthogonal to the gas, and it is well mixed with the combustion gas and completes the combustion. At this time, the flame holding ring 4 receives the heat of the flame and becomes red and lowers the flame temperature, which also has the effect of reducing the amount of nitrogen oxides generated.

Further, the combustion heat and the exhaust gas are passed through the combustion outer cylinder 12 provided above the pot 2 and then discharged into the room as it is (indoor exhaust type heater), and the combustion outer cylinder 12 has an unillustrated exhaust gas. There is a usage (outdoor exhaust type heater) in which a cylinder is connected to perform outdoor exhaust, and heat rays are emitted from the combustion outer cylinder 12 for heating.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the structure will be described with reference to the drawings showing an embodiment. 1 is a large number of air holes formed in the side wall of the pot 2, the uppermost row air hole 1a, the central air hole 1b, and the lower air hole 1c. The number of holes increases from the bottom to the top. Four
Is a flame-holding ring having an opening 3 in the central portion, which is connected to the upper edge of the side wall of the pot 2, and the flame-holding ring 4 has a tapered portion 4a which is downwardly downward toward the opening 3 in the central portion. And the air entering from the top row air holes 1a is tapered portion 4a.
It goes to the back side of the and goes diagonally downward and mixes well with the rising combustion gas, which contributes to complete combustion.

Reference numeral 5 is a fuel supply means for feeding fuel into the pot 2, and an oil amount regulator for feeding by a head, an electromagnetic pump forcibly feeding, etc. are generally used. Reference numeral 6 denotes an oil feed pipe that connects the fuel supply means 5 and the pot 2, and the tip end portion to be inserted into the pot 2 has a nozzle shape. 7 is a blower for sending combustion air to the pot 2, and an air passage 8 communicating with the outside of the pot 2.
To supply combustion air to the pot 2. Reference numeral 9 denotes a preheating / ignition heater provided in the lower bottom portion of the pot 2, and has a role of vaporizing and igniting fuel at the time of ignition.

Reference numeral 10 denotes a pilot ring provided on a side wall in the middle of the pot 2. The lower air hole 1c is formed in a side wall of the pot 2 below the pilot ring 10, and the primary air mixing chamber A is provided below the pilot ring 10. Are configured. Reference numeral 11 denotes a blue flame cap provided in the upper center of the pot 2, and the outer diameter of the blue flame cap 11 is the pilot ring 10
Is slightly larger than the inner diameter of the pot 2 and smaller than the inner diameter of the pot 2, and is connected to the pilot ring 10 by the supporting leg 10a, and the secondary combustion occurs between the upper edge of the blue flame cap 11 and the flame holding ring 4. It constitutes room B. Also, pilot ring 1
0 and the blue flame cap 12 constitute an auxiliary combustion member of the pot type oil combustor.

An outer cylinder 12 is connected to the upper portion of the pot 2,
A metal cylinder or a glass cylinder is generally used, and is a passage for exhausting combustion gas indoors or connected with an exhaust cylinder to exhaust the air outdoors.

[0015]

The present invention has the above-mentioned structure and operation. A flame holding ring 4 is provided at the upper edge of the side wall of the pot 2 and is lowered downward. Since the parts are made to face below the uppermost row air holes 1a of the pot 2, the air supplied from the uppermost row air holes 1a hits the back side of the taper portion 4a of the flame holding ring 4 and is guided obliquely downward, It mixes well with the combustion gas rising in the pot 2 and contributes to complete combustion.

Further, this type of combustor is one in which the heat power is adjusted to a large or small value and burns (eg: 2500 Kcal to 6).
00Kcal), 600Kca of minute by this structure
Even if the pressure is reduced to 1, the air and the combustion gas are smoothly mixed in the secondary combustion chamber B, so that good combustion is performed.

Further, since the taper portion 4a of the flame holding ring 4 is provided close to the flame and the heat of the flame is taken to lower the flame temperature, the amount of phenolnox generated is also reduced. It is a thing.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part showing an example of a conventional combustor.

[Explanation of symbols]

 1 Air hole 1a Uppermost row air hole 1b Central air hole 1c Lower air hole 2 Pot 3 Central opening of flame retaining ring 4 Flame retaining ring 4a Tapered portion of flame retaining ring

Claims (1)

[Claims] 1. A pot 2 having a large number of air holes 1 on its side wall.
The flame holding ring 4 having the opening 3 in the center is connected to the upper edge of the side wall of the pot 2, and the flame holding ring 4 forms a taper portion 4a that is downwardly downward toward the opening 3 in the center. In addition, a pot type oil combustor in which the end of the opening 3 is located below the uppermost row air holes 1a on the side wall of the pot 2.