JPH0634108A - Pot type petroleum burner - Google Patents

Abstract

PURPOSE:To perform a low air ratio combustion and a complete combustion at the time of a low heating value by disposing a central body at the center of a cylinder in a secondary combustion area. CONSTITUTION:A secondary air blown out of the inner wall of a burner is rectified along the inclined surface of a central body 7 of a secondary combustion area 8 above a burner pot 1 and elevated. Since the flow stream line of a fluid can be made constant because of the presence of the central body 7, the flow of fluid the same as that at the time of the maximum heating value can be obtained even at the time of a small heating value in which a flow rate is low. Thus, the mixed air of a combustion air and a fuel steam can be completely mixed. Further, the central body 7 is red-heated by flame, so that the flame holding and combustion reaction of this central body 7 are effectively urged upon combustion at a low heating value where the temperature of flame is especially lowered and an incomplete combustion is liable to arise. Thus, a low air ratio combustion and complete combustion at a turn-down ratio can be effected.

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 household kerosene stoves and the like.

[0002]

2. Description of the Related Art A pot-type oil burner currently in practical use has a large turndown ratio (maximum heat generation amount / heat generation amount during combustion, hereinafter referred to as TD) and has a low air ratio combustion even with a small heat generation amount. And there is nothing that can be completely burned.

FIG. 5 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.

The vaporized fuel mixes with the combustion air from the primary air holes in the lower part of the burner pot and undergoes primary combustion (intermediate combustion).
Then, it is further mixed with the combustion air from the secondary air hole in the upper part of the burner pot to carry out secondary combustion to complete the combustion.

The combustion performance of the burner depends on how well the fuel vapor and the combustion air are mixed uniformly to stabilize the flame. For that purpose, various rectifiers and flame stabilizers have been devised.
Although it has been used, basically, by appropriately setting the distance a between the burner wall and the upper part of the flame stabilizer, the flow velocity of the air-fuel mixture is controlled to optimize the combustion characteristics. Stabilization of the flame base by the peripheral edge 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 and the combustion air rectifying plate above the burner pot, the mixing and flow of the secondary air and the intermediately combusted air-fuel mixture are optimized to improve the combustibility. Improve. And so on.

However, the pot type petroleum burner currently put into practical use can obtain TD at most about 3 to 4, and even if it can burn at a relatively low air ratio at the maximum calorific value,
At a low calorific value, it cannot be combusted unless a large amount of air is sent, and it cannot be completely combusted, and CO is present at a high concentration.

[0007]

DISCLOSURE OF THE INVENTION The present invention improves the shape of the flame stabilizer and promotes the mixing and combustion reaction of the combustion air and the intermediate combustion mixture in the secondary combustion region above the burner. , It was difficult with conventional pot type oil stove,
The present invention provides 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 has a fuel supply pipe and has a triangular cross section, a trapezoidal cross section, or the like at the level of the upper air supply hole of a burner pot having an air supply hole on the circumference of the burner pot. A pot type oil burner characterized in that an object having the shape of is disposed in the center of the burner pot, and a combustion region is formed between the upper air supply hole and the object. Further, the present invention is a pot type oil burner in which a flame stabilizer is internally provided in a burner pot, and a conical object is arranged above the flame stabilizer.

According to the present invention, an object having a triangular shape, a trapezoidal shape or a similar shape (hereinafter referred to as a central body) is provided at the level of the upper air supply hole of the burner pot. According to the present invention, the central body and the burner cylindrical wall are provided. A flow path is formed between the flow path and the flow path to promote the mixing of the secondary combustion air and the fuel vapor in the flow path, and further to heat the central body red and bring the flame into contact therewith to promote the combustion reaction. Thus, a large TD combustion can be achieved, and particularly, a low air ratio combustion and a complete combustion at a low calorific value are possible.

[0010]

FIG. 1 shows an embodiment of a pot type burner according to the present invention.
Will be described. Fuel is sent to the bottom of the burner pot 1 from a petroleum (kerosene) supply pipe 5 and vaporized, and combustion air is supplied from a blower through an air duct 10 and an 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 6 stages, the lower 3 stages (4a) are primary air, and the upper 3 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.
Then, the flame stabilizer 2 mixes with the primary air to perform primary combustion (intermediate combustion). The air-fuel mixture burned in the middle is 2 above the pot.
In the secondary combustion region 8, secondary air is mixed with secondary air from the upper three air holes and secondary combustion is performed.

The feature of the present invention resides in that the central body 7 is arranged at the center of the cylinder of the secondary combustion region 8, and in the embodiment, the central body having a conical shape is arranged. Central body 7 is flame stabilizer 2
It is placed on and is integral with the flame stabilizer. The lower edge 7a has a diameter larger than the outer diameter of the flame stabilizer 2 by a length α.
Since the material of the central 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 this central body, a flow path for the air-fuel mixture is formed between the central body and the inner wall of the burner pot. The shape of this 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 streamline of the secondary air and the air-fuel mixture, that is, to rectify and uniformly mix the secondary air and the air-fuel mixture. By making the central body heat red, this central body acts to stabilize and accelerate the combustion reaction. And so on.

The operation and effect of this central body will be described with reference to the embodiment shown in FIG. In the secondary combustion area 8 above the pot,
The secondary air blown from the inner wall of the burner is rectified and rises along the slope of the central body. With this air flow 9, the air-fuel mixture that has undergone intermediate combustion in the primary combustion zone below the pot is merged and mixed, and rises while secondary combustion occurs. Further, by providing the upper lid ring 11, this rectifying / mixing effect can be enhanced.

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

Due to the presence of this central body, the streamline of the fluid can be made constant, so that the fluid flow similar to that at the time of maximum heat generation can be obtained even at the time of low heat generation where the flow velocity becomes slow. Therefore, the combustion air and the air-fuel mixture can be sufficiently mixed, and further, the central body becomes red-hot due to the flame, so especially when the temperature of the flame falls and combustion with a small calorific value that easily causes incomplete combustion, the flame holding and combustion of this central body Since the effect of accelerating the reaction is great, it enables low air ratio combustion and complete combustion in a large TD.

FIG. 2 shows another embodiment of the present invention. In FIG. 2, the central body 7 is arranged in the central portion of the burner pot 1, the air supply hole 4b is 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. .

In order to verify the effect of the present invention, FIG.
3 and FIG. 4 show the results of a combustion comparison test of the pot type oil burner according to the embodiment of the present invention and the pot type petroleum burners of several commercially available kerosene stoves currently on the market.

The following can be said from FIGS. 3 and 4. The pot type oil burner currently in practical use has a maximum TD of about 4, and even in a place where the TD is large, it is not possible to burn it by increasing the air ratio and sending a large amount of air. It is being generated, and it cannot be said that normal combustion is occurring. On the other hand, in the pot type oil burner according to the present invention, TD7 can be achieved and combustion can be performed at a low air ratio up to the minimum calorific value, and CO in exhaust gas is not detected at all.

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

In the conventional pot type oil burner, since the secondary combustion region is simply a space, an ideal fluid flow cannot be obtained, and the secondary air and the intermediate-burned mixture are mixed sufficiently uniformly. It is considered that mixing is not performed sufficiently and combustion performance is deteriorated in the low calorific value combustion region where the flow rate is low and the flow velocity is slow. 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 in a constant streamline along the slope of the central body,
Since this streamline does not change even in the low calorific value combustion region, uniform mixing similar to that at the time of maximum calorific value is performed, so that low air ratio combustion is possible even in large TD combustion.

In the case of the present invention, the flame is brought into collision contact with the central body, and the combustion reaction is promoted by the red heat of the central body. However, as compared with the conventional flame stabilizer, the flame is centered along the streamline. Since it can be brought into contact with the body, the contact time can be extended, and therefore the effect of promoting combustion reaction by the red-hot central body becomes large, and the temperature of the flame usually decreases, the reaction speed decreases and incomplete combustion tends to occur. CO even during calorific value combustion
Complete combustion is performed without the occurrence of

[0023]

EFFECTS OF THE INVENTION According to the present invention, it is possible to achieve low air ratio combustion and complete combustion at a large TD, which was difficult with the conventional pot type oil burner. It is possible to realize an oil stove with superior functions not found in conventional products.

Since no CO is generated over the entire combustion region, a large TD combustion can be performed (TD 5 or more), and an open-type pot type oil stove can be manufactured (the open-type pot type oil stove currently on the market is TD). Is about 2.5, and CO is seen to be generated with a small amount of heat generation).

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

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

As described above, according to the present invention, it is possible to improve the performance of the heating apparatus using the pot type oil burner, and contribute to energy saving of heating, cleaning of the environmental atmosphere and safety.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram of another embodiment of the present invention.

FIG. 3 is a chart showing a relationship between an air ratio and a maximum heat generation amount / combustion heat generation amount.

FIG. 4 is a chart showing the relationship between CO concentration in exhaust gas and maximum calorific value / combustion calorific value.

FIG. 5 is a vertical sectional view of a general pot type oil burner.

[Explanation of symbols]

 1 burner pot 2 flame stabilizer 3 primary air straightening plate 4a primary air hole 4b secondary air hole 5 fuel supply pipe 6 flame stabilizer upper disk 7 central body 8 secondary combustion region 9 secondary air flow 10 air duct

Claims (2)

[Claims] 1. An object having a triangular cross section, a trapezoidal cross section or a similar shape at the level of an upper stage air supply hole of a burner pot having a fuel supply pipe and having an air supply hole provided on the circumference of the burner pot is provided with a burner. A pot type oil burner, which is arranged in the center of the pot and has a combustion region formed between the upper air supply hole and the object. 2. The pot type oil burner according to claim 1, wherein a flame stabilizer is internally provided in the burner pot, and an object having a conical shape or the like is disposed above the flame stabilizer.