JPH0235204B2 - NENSHOSOCHI - Google Patents

Description

[Detailed description of the invention]

<Industrial Application Field> The present invention relates to a combustion device called a pot burner, and particularly to a combustion device that can fully demonstrate its performance even when using low-quality fuel. <Prior Art> Kerosene pot-type burners have been widely used for home heating. This is shown in Figure 7. In the figure, the pot 1 has a number of combustion air holes 2 in the peripheral wall of the cylinder whose one end is closed.
It has a configuration in which a mixing chamber 3 for air and fuel is formed inside the cylinder. A fuel supply pipe 4 is connected to the outer circumferential wall of the bottom of the pot 1, and the bottom of the pot 1 becomes a fuel reservoir 5 through the fuel supply pipe 4. or,
An igniter 6 is mounted on the bottom outer peripheral wall of the pot 1.
It is installed by going inside. The ignition device 6
A glass ribbon is disposed at a position connecting the tip side of the pot 1 to the fuel reservoir 5 at the bottom of the pot 1, and this glass ribbon 7 sucks up the fuel, evaporates it, and ignites it. Inside the pot 1 is a central cylinder 9 that extends from the bottom to approximately the middle along its central axis and has a large number of holes 8 in its peripheral wall, and an annular space between the central cylinder 9 and the pot 1 that is partitioned in the axial direction. A combustion ring 11 is provided, which includes a baffle 10 and a buffle 10 disposed immediately downstream of the center cylinder 9. A combustion chamber 12 is provided at the upper end opening of the pot 1.
A combustion cylinder 13 forming a combustion chamber is connected to the combustion chamber 13. An exhaust port 14 is provided on the peripheral wall of this combustion tube 13.
4, combustion gas in the combustion chamber 12 is guided into the combustion chamber 12 via a duct portion 16 partitioned by a partition wall 15. Also, pot 1
The outer periphery is surrounded by an air duct 17 via a space, and the air duct 17 is
The air introduced into the pot 1 is blown out from the air hole 2 of the pot 1 as combustion air. <Problems to be Solved by the Invention> The above-mentioned pot-type burner is supplied with fuel of lower quality than kerosene (at least kerosene mixed with heavy oil components,
Alternatively, when fuel oil substantially heavier than kerosene, such as low sulfur A heavy oil, is burned, there are the following disadvantages. (1) Soot is mixed in the exhaust. (2) Carbonaceous matter accumulates in the lower part of the combustion part (bottom of the pot), making it dirty. (3) As a result of (1) and (2), combustion becomes incomplete. Therefore, when using low-quality fuel, the conventional pot-type burner cannot be used for a long period of time, and can be said to be incomplete as a combustion device for low-quality fuel. Table 1 shows the temperature distribution of the bottom of the pot and the combustion ring inside the pot when kerosene and low-quality fuel are combusted using such a pot burner. The center, left, right, igniter, and front of the bottom of the pot in this table are shown in the schematic diagram of Figure 8, respectively.
~ e position, and the #1 hole, #2 hole, #3 hole, #4 hole and the top of the combustion ring part in the pot are as follows.
These are positions f to j shown in FIG. 8, respectively. As is clear from such data, when low-quality fuel is burned, the bottom temperature of the pot is as low as 140 to 190°C, and the temperature inside the pot is approximately 1000°C or less. With this low pot bottom temperature, the low quality fuel is heavier than kerosene and the endpoint is 360.
Since the temperature is assumed to be ~370℃, it is natural that evaporation will not occur sufficiently.
As mentioned above, various inconveniences occur.

[Table] The present invention provides such a pot-type burner,
In view of the various problems that arise when using low-quality fuel, it is important to maintain the combustion ring disposed inside the pot at a predetermined high temperature. The purpose is to increase the temperature at the bottom of the pot by radiating heat to the bottom of the pot. <Means and effects for solving the problems> For this reason, the present invention aims to improve the mixing of the flame by forming the central cylinder of the combustion ring to be long and adding a buttful to its outer periphery. A resistor is inserted to increase the heat storage effect and flame suppression effect. <Example> Examples will be described below. In Figure 1, the same symbols as in Figure 7 are:
The same elements as FIG. 7 are shown. A combustion ring 18 is disposed within the pot 1. This combustion ring 18, as shown in FIG.
A central cylinder 20 extends along the central axis of the pot 1 from the bottom of the pot 1 to the upstream side of the combustion chamber 12 and has a large number of holes 19 in the peripheral wall, and a space between the outer peripheral surface of the central cylinder 20 and the inner peripheral surface of the pot 1. Batsuful 21 that partitions the annular space into a plurality of chambers a to d arranged in parallel along the axial direction.
It consists of and. Further, a resistor 22 as shown in FIG. 3 is inserted into the central cylinder 20 of the combustion ring 18. This resistor 22 consists of a plurality of circular plates 23 arranged on a shaft 24 at predetermined intervals in the axial direction and each having a large number of holes, and a plurality of ceramic tubes arranged on the upper surface of the circular plate 23 located at the top. 26,2
It consists of 7 and. Here, the buttful 21 of the combustion ring 18
The position of the air hole 3 relative to the pot 1 is specified as shown in FIG. 2, and the position of the air hole 3 relative to the baffle 21 is also specified as shown in the same figure. The tube bodies 26 and 27 are arranged as shown in FIG. That is, as shown in FIG. 4A, a plurality of circular small tube bodies 26 (see FIG. 4B) are arranged and fixed in the center of the topmost circular plate 23, that is, the first stage. On the peripheral edge of the circular plate 23, a combination of a small tube body 26 and a circular large tube body 27 doubly arranged inside and outside (see FIG. 4C) is attached, and a group of small tube bodies 26 in the center is The array is fixed so as to surround it. In addition, as shown in FIG. 4A, a plurality of circular small tube bodies 26 are arranged and fixed in the center of the second to fourth circular plates 23, and the peripheral edges of the circular plates 23 are arranged and fixed. In the section, a combination of the small tube bodies 26, 26 and the large tube body 27 stacked in two layers in an inner and outer double layer (see Fig. 4D) is arranged so as to surround the group of small tube bodies 26 in the center. The array is fixed. In this embodiment, there are 15 circular plates 23, of which tubes 26 and 27 are arranged in four stages. According to the pot-type burner having such a structure, the combustion ring 18 is formed long and the buffle 21 is added, thereby improving flame mixing. Further, by inserting the resistor 22 into the combustion ring 18, the heat storage effect and the flame suppression effect can be improved. Here, using the pot type burner of this example,
Table 2 shows the temperature distribution at the bottom of the pot and the combustion ring inside the pot during combustion of kerosene and low-quality fuel. The center, left, right, igniter, and front of the bottom of the pot in this table are shown in the schematic diagram of Figure 5, respectively.
- e positions, and the #1 hole, #2 hole, #3 hole, #4 hole, the top, and the upper part of the ring in the in-pot combustion ring section are respectively f to k positions shown in FIG. 5. As is clear from these data, when low-quality fuel is burned, the temperature at the bottom of the pot rises to 260 to 510°C, thereby preventing carbon deposition.
Moreover, the temperature inside the pot becomes 1100°C or higher, and combustion is almost completed within the pot. Next, in the configuration of the pot burner of this embodiment, the circular plate 23 of the resistor 22 and the tube bodies 26, 2
When the same experiment as above was carried out with 7 removed as appropriate, the results are shown in Table 2.

【table】

[Table] In other words, when the degree of modification is lowered as in Test Nos. 4, 6, and 8, the temperature inside the pot decreases (below 1100℃).
is observed, combustion becomes incomplete, and as a result, the smoke scale worsens to 6. In this state, for example, it does not meet the JIS standards (smoke scale 5 or less) for stoves using pot-type burners, and it cannot be sold as a product. Further, in Test Nos. 3, 5, and 7, the degree of reduction in the degree of modification was small and the deterioration of combustion conditions was mild, but the performance was still lower than that of this example. As is clear from these results, in order to maintain good combustion conditions in a pot-type burner, the combustion ring must be designed to keep the pot bottom temperature high enough and the pot internal temperature above 1100℃. It is better to use a resistor with 10 or more circular plates and 3 or more tubes. Note that, depending on the structure of the combustion ring part, the pot type burner according to the present invention may have the following characteristics as shown in FIG. 6A:
Flames may rise and the upper part of the outer wall of the combustion cylinder may become red hot. Such conditions are dangerous and unsatisfactory in terms of efficient use of the combustion chamber. Therefore, if a circular restraining plate 28 is attached to the upper end of the central cylinder 20 of the combustion ring 18 as shown in FIG. 1, in this case, as shown in FIG. The side walls become red hot. Therefore, as shown in FIG.
By arranging the perforated cylinder 29 around the upper end of the central cylinder 20 of No. 8, as shown in Fig. 6C, it is possible to suppress the flame from spreading in the lateral direction, eliminate the red-hot part of the combustion tube, and reduce the combustion chamber. can be used efficiently. <Effects of the Invention> As explained above, according to the present invention, the central cylinder of the combustion ring is formed long and the outer circumference is rounded to improve the mixing of the flame. By inserting a resistor to increase the suppressing effect, the combustion ring is maintained at a predetermined high temperature, that is, the heat generated by combustion is retained by the combustion ring, and the heat is radiated to the bottom of the pot. By raising the temperature, the combustion condition of the burner can be maintained in good condition, and when low-quality fuel is used in a pot-type burner, it is possible to eliminate carbon buildup at the bottom of the pot, which can last for a long time. It is possible to use a burner, making it ideal as a combustion machine for low-quality fuel, and improving product value.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of a pot-type burner according to the present invention, FIG. 2 is a longitudinal cross-sectional view showing the relationship between the combustion ring and the pot in the same embodiment, and FIG. 3 is a longitudinal cross-sectional view showing the relationship between the combustion ring and the pot in the same embodiment. A front view showing a resistor,
Fig. 4 is a diagram showing the structure of the tubular body in the same resistor as above, A is a plan view, B to D are front views showing the constituent elements, and Fig. 5 is the bottom of the pot and the internal combustion ring part of the same embodiment as above. 6A, B, and C are longitudinal cross-sectional views showing the flame shape in the apparatus according to the embodiment of the present invention, FIG. 7 is a vertical cross-sectional view showing an example of a conventional pot-type burner, and FIG. 8 is the same as above. FIG. 2 is a schematic diagram of the bottom of the pot and the combustion ring inside the pot of the burner. 1... Pot, 2... Air hole, 3... Mixing chamber, 12...
Combustion chamber, 18... Combustion ring, 19... Hole, 20... Center cylinder, 21... Buzzful, 22... Resistor, 23...
Circular plate, 26, 27... tube body.

Claims (1)

[Scope of Claims] 1 A pot having a plurality of combustion air holes in the circumferential wall of a cylinder whose one end is closed, and a mixing chamber for air and fuel formed inside the cylinder; In a combustion device comprising a combustion chamber communicating with an opening at the other end, the pot includes a central cylinder extending from the bottom to the upstream side of the combustion chamber along the central axis and having a large number of holes in the peripheral wall; A combustion ring consisting of a buttful that partitions the annular space between the outer peripheral surface and the inner peripheral surface of the pot into a plurality of chambers arranged in parallel along the axial direction is disposed, and a plurality of chambers are arranged in the central cylinder of the combustion ring. It is characterized by inserting a resistor consisting of circular plates arranged in rows at predetermined intervals in the axial direction and each having a large number of holes, and a plurality of ceramic tubes arranged on the upper surface of the circular plate located at the top. combustion equipment. 2. The combustion device according to claim 1, wherein the resistor has 10 or more circular plates and the number of tube bodies arranged in three or more stages.