JP2739012B2 - Pot type oil burner - Google Patents

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 burner used for a kerosene stove for home use and the like.

[0002]

2. Description of the Related Art In a pot-type oil burner currently in practical use, a turn-down ratio (maximum heat value / heat value during combustion; hereinafter, referred to as TD) can be large, and a low air ratio combustion can be achieved even with a small heat value. And what can be completely burned is not found.

FIG. 4 shows the structure of the most common pot type oil burner. In the figure, 1 is a burner pot, 2 is a flame stabilizer, 3
Is a combustion air straightening plate, 4a is a primary air hole, 4b is a secondary air hole, and 5 is a fuel supply pipe.

[0004] The vaporized fuel is mixed with the combustion air from the primary air hole at the lower part of the burner pot to perform primary combustion (intermediate combustion).
Then, the mixture is mixed with the combustion air from the secondary air hole at the upper part of the burner pot, and the secondary combustion is performed to complete the combustion.

[0005] The combustion performance of the burner depends on how well the fuel vapor and the combustion air are uniformly mixed to stabilize the flame. For this purpose, various rectifying / flame holding devices have been devised.
Although it has been used, its basic principle is to control the flow rate of the air-fuel mixture and optimize the combustion characteristics by appropriately setting the distance a between the burner wall and the upper part of the flame stabilizer. Stabilization of the flame base by the periphery of the disc 6 above the flame stabilizer (flame holding effect)
Plan. By devising the shape of the flow path in the region 8 formed by the flame stabilizer above the burner pot and the combustion air straightening plate, the mixing and flow of the secondary air and the intermediately-combusted air-fuel mixture are optimized, and the combustibility is improved. Improve. And so on.

However, a pot-type oil burner currently in practical use has a TD of only about 3 to 4 at most, and even if it can be burned at a relatively low air ratio at the maximum calorific value,
With a small calorific value, combustion cannot be performed unless a large amount of air is sent in, and even that cannot be completely burned, and at present, high concentrations of CO are generated.

[0007]

SUMMARY OF THE INVENTION The present invention is to improve the shape of a flame stabilizer, and to promote the mixing of combustion air and an intermediate combustion mixture in a secondary combustion region above a burner and the promotion of a combustion reaction. , Which was difficult with conventional pot-type oil stoves,
An object of the present invention is to provide a pot-type oil burner that enables low air ratio combustion and complete combustion at a large TD (5 to 6 or more).

[0008]

SUMMARY OF THE INVENTION The present invention relates to a burner pot.
Inner diameter circumferentially provided an air supply hole, holding the burner pot
With the flame set up, the fuel supply pipe is installed at the bottom of the burner pot.
The air supply holes are spaced several steps vertically in the burner pot.
The upper and lower air supply holes.
Form and place the frustoconical central body of heat-resistant steel plate on the flame holder
And make the central body correspond to the level of the upper air supply hole.
The lower edge of the core is a diameter larger than the outer diameter of the flame stabilizer by length α,
The secondary air blown out from the upper air supply hole is the slope of the central body
Is a pot-type oil burner characterized by being rectified along .

In the present invention, a frustoconical center body (hereinafter referred to as a center body) is provided at the level of the upper air supply hole of the burner pot. According to the present invention, a flow path is formed between the center body and the burner cylindrical wall. And promoting the mixing of the secondary combustion air and the fuel vapor in the flow path, further causing the central body to glow red,
By bringing a flame into contact with this to promote the combustion reaction, large TD combustion is made possible, and in particular, low air ratio combustion and complete combustion with a small calorific value are made possible.

[0010]

FIG. 1 shows an embodiment of a pot type burner according to the present invention.
This will be described below. The fuel is sent from the oil (kerosene) supply pipe 5 to the bottom of the burner pot 1 and vaporized, and the combustion air is supplied from the blower through the air duct 10 through the air hole 4.

A plurality of air holes 4 are arranged along the circumferential direction of the inner diameter of the burner pot 1, and a plurality of rows of holes are provided at appropriate intervals in the vertical direction of the pot. In the embodiment, there are six stages, the lower three stages (4a) are primary air, and the upper three stages (4b).
Supplies secondary air. The fuel vapor vaporized at the bottom of the pot firstly flows into the primary air straightening plate 3 in the lower region of the pot.
And the primary flame is mixed by the flame stabilizer 2 to perform primary combustion (intermediate combustion). The air-fuel mixture that has undergone intermediate combustion is
In the secondary combustion zone 8, secondary air is mixed with the secondary air from the upper three-stage air holes to perform secondary combustion.

A feature of the present invention resides in that the center body 7 is arranged at the center of the cylinder of the secondary combustion area 8, and in the embodiment, the center body having a conical shape is arranged. Central body 7 is flame holder 2
And is integrated with the flame stabilizer. The lower edge 7a is provided with a diameter larger by the length α than the outer diameter of the flame stabilizer 2.
Since the material of the center body is required to have heat resistance, it needs to be made of heat-resistant steel plate. Although FIG. 1 shows an example in which the central body is fixed to the flame stabilizer, the central body may be separately provided above the flame stabilizer.

As a function and effect of the central body, a flow path of the air-fuel mixture is formed between the central body and the inner wall of the burner pot. The shape of the flow path can be changed depending on the shape and size of the central body. This makes it possible to optimize the flow velocity and streamlines of the secondary air and the air-fuel mixture, that is, to achieve rectification and uniform mixing of the secondary air and the air-fuel mixture. By glowing the central body, the central body acts to stabilize and promote the combustion reaction. And so on.

The operation and effect of this center body will be described with reference to the embodiment shown in FIG. In the secondary combustion zone 8 above the pot,
The secondary air blown out from the inner wall of the burner is rectified along the slope of the central body and rises. The air-fuel mixture mixed in the primary combustion zone in the lower part of the pot is mixed with the air flow 9 and rises while the secondary combustion takes place. Further, the rectification / mixing effect can be enhanced by providing the upper lid ring 11.

At this time, the flow rate of the air-fuel mixture can be controlled by the size of the central body and the size of the inner diameter of the upper lid ring. As the flow speed is increased, the mixing of the secondary air and the air-fuel mixture that has undergone intermediate combustion is promoted. As a result, the mixture becomes premixed combustion (combustion flame combustion), and as the flow rate is reduced, it becomes diffusion combustion (combustion flame combustion).

The flow of the fluid can be made constant by the presence of the central body, so that the same fluid flow as that at the time of the maximum heat generation can be obtained even when the heat generation amount is low and the flow rate is low. Therefore, the combustion air and the air-fuel mixture can be sufficiently mixed, and the central body is red-heated by the flame. Since the effect of accelerating the reaction is large, low air ratio combustion and complete combustion at a large TD can be achieved.

As described above, in the present invention , the central body 7
Is disposed at the center of the burner pot 1 and has an air supply hole 4b.
Are provided at the level of the central body, and a combustion region is formed between the air supply hole 4b and the central body 7. Also, the lower edge of the central body
By increasing by α, it flows along the flame holder
Intermediately burned gas hits the lower edge and bends,
The flow is locally disturbed in this area.
The distance between the inner wall becomes narrower and the flow velocity increases,
Mixing is rapidly promoted near the lower edge. Further promotes mixing
After the gas passes through the lower edge, from the top of the burner wall
Along the slope of the conical part of the central body with the airflow of
You. At this time, the flow path gradually expands,
The flow velocity of the flowing gas can also be suppressed. Therefore,
Mixing with air is uniform because flow turbulence is reduced.
And uniform and complete combustion can be obtained. Over burning
The effect is obtained by selecting the shape of the centrosome.

In order to verify the effect of the present invention, FIG.
FIG. 2 and FIG. 3 show the results of a combustion comparison test between the pot-type oil burner according to the embodiment of the present invention and a pot-type oil burner of several companies among household kerosene stoves currently on the market.

[0019] The following can be said from FIGS. 2 and 3. The TD of a pot-type petroleum burner currently in practical use has a maximum TD of about 4, and even where the TD is large, it is not possible to burn unless a large amount of air is sent and a large amount of air is sent. It does not mean that it is producing normal combustion. On the other hand, in the pot type oil burner according to the present invention, the combustion can be performed at a low air ratio up to the minimum heat value by TD7, and CO in the exhaust gas is not detected at all.

As described above, the pot-type petroleum burner of the present invention exhibits very excellent combustion performance as compared with the conventional one, and the following two points can be considered for the reasons.

In the conventional pot-type petroleum burner, an ideal fluid flow cannot be obtained because the secondary combustion area is a mere space, and the secondary air and the air-fuel mixture that has undergone intermediate combustion are sufficiently uniformly mixed. It is considered that the mixing is not sufficiently performed in the low heat generation combustion region where the flow rate is low and the flow velocity is low, and the combustion performance is deteriorated. On the other hand, in the burner according to the present invention, the secondary air and the air-fuel mixture that has undergone intermediate combustion are mixed while flowing as a constant streamline along the slope of the central body.
Since this streamline does not change even in the low calorific value combustion region, the same uniform mixing as in the maximum calorific value is performed, so that the low air ratio combustion can be performed even in the large TD combustion.

In the case of the present invention, the flame collides with the central body and the central body glows red, thereby promoting the combustion reaction. The contact time can be prolonged because it can be brought into contact with the body, and therefore, the effect of promoting the combustion reaction by the glowing central body is increased, and the temperature of the flame is usually lowered, the reaction speed is reduced, and the incomplete combustion is likely to occur. CO during combustion
No combustion occurs and complete combustion is performed.

[0023]

According to the present invention, it is possible to perform low air ratio combustion and complete combustion at a large TD, which is difficult with a conventional pot-type petroleum burner. It is possible to realize an oil stove having excellent functions not found in conventional ones.

Since there is no generation of CO over the entire combustion region, large TD combustion can be performed (TD5 or more), and an open pot type oil stove can be manufactured. Is about 2.5, and CO is generated with a small calorific value.)

Since combustion at a low air ratio is possible over the entire combustion region, the temperature of the flame (combustion temperature) can be maintained high even with combustion with a small calorific value, so that a pot-type oil stove having strong radiant heat over the entire combustion range can be manufactured. (Pot-type oil stoves currently available on the market
In the combustion with a small calorific value, the combustion of the air ratio is large, so that the temperature of the flame is extremely lowered and the heating capacity by radiation is almost eliminated.)

Since combustion at a low air ratio is possible over the entire combustion region, a pot-type oil stove with high heating efficiency with little waste heat loss due to excess air can be manufactured. Since large TD combustion is possible, one stove can also serve as a stove from a large heating value to a small heating value.

As described above, according to the present invention, the performance of a heating appliance using a pot-type petroleum burner can be improved, which can contribute to energy saving of heating, purification of environmental atmosphere, safety, and the like.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a table showing a relationship between an air ratio and a maximum heating value / combustion heating value.

FIG. 3 is a table showing the relationship between the CO concentration in exhaust gas and the maximum calorific value / combustion calorific value.

FIG. 4 is a longitudinal sectional view of a general pot type oil burner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Burner pot 2 Flame stabilizer 3 Primary air flow regulating plate 4a Primary air hole 4b Secondary air hole 5 Fuel supply pipe 6 Flame stabilizer upper disk 7 Central body 8 Secondary combustion area 9 Secondary air flow 10 Air duct

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 55-105780 (JP, U) Japanese Utility Model Sho 63-104814 (JP, U) Japanese Patent Publication Sho 56-14926 (JP, B2)

Claims (1)

(57) [Claims] An air supply hole is provided in a circumferential direction of an inner diameter of a burner pot, a flame stabilizer is erected on the burner pot, and a fuel supply pipe is provided.
Is provided at the bottom of the burner pot, and the air supply hole is
Open several holes in the vertical direction of the
A supply hole and a lower air supply hole are formed, and a frustoconical center body of heat-resistant steel plate is placed on the flame stabilizer, and the level of the upper air supply hole is reached.
Align the central body with the lower edge of the central body from the outer diameter of the flame holder
Blown from upper air supply hole with diameter larger by length α
A pot-type oil burner characterized in that secondary air is rectified along the slope of the central body .