JPH0252913A - Tubular burner - Google Patents

Abstract

PURPOSE:To heat an entire outer tube uniformly by covering the end of an inner tube, that is inserted into the outer tube, with an inner end plate, and making combustion gas in the inner tube flow through a number of flow paths into a combustion gas flow path. CONSTITUTION:An inner tube 7 is inserted into an outer tube 6 so as to form a combustion gas flow path 12, and the end of the inner tube is covered with an inner end plate 13. A number of flow paths 16, from which combustion gas flows into the combustion gas flow path 12, are perforated on the effective heating part 15 across a flame end 14 and the inner end plate 13 of the inner tube 7. The outer tube 6 is heated by combustion gas that flows from the inner tube 7 through the flow paths 16 into the combustion gas flow path 12. As a result, the temperature distribution over the surface of the outer tube can be maintained uniform because such an undesirable state is avoided that the vicinity of the end of the outer tube 6 becomes high temperature locally resulting in uneven temperature distribution over the surface of the outer tube 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a single-end tube burner that heats an object to be heated by dissipating heat from internal combustion gas from the outer peripheral surface.

(Prior art) In a conventional single-end type tube burner in which an inner tube and seven outer tubes are arranged side by side inside and outside, the combustion gas burned in the inner tube a is transferred to the tip of the inner tube a, as shown in Fig. 4. It flows out through the outlet a1, flows through the gap C between the inner tube a and the outer tube b, and is discharged from the discharge C1d above the outer tube b.

In addition, as a conventional technique, for example, Japanese Patent Publication No. 57-4040
There is Publication No. 6.

(Problems to be Solved by the Invention) In the case of a conventional tube burner, the combustion gas that is burned in the inner tube a and flows out from the outlet a1 collides with the inner wall surface of the tip of the outer tube b, causing damage to the outer duplex b. Since the tip is heated to the highest temperature, the outer tube b
There were problems in that the surface temperature distribution of the outer tube b was uneven, that the tip of the outer tube b was burnt out due to high heat, and that the strength and physical properties of the tip were locally degraded.

In addition, when cleaning the inside of the tube burner by discharging and removing oxidized scale e generated by high-temperature combustion gas and remaining on the bottom surface of the outer tube section, the inside of the outer tube section fixed to the furnace wall f is cleaned by the fuel supply section. Since it is necessary to clean the tube barb with the inner tube a and the outer tube b removed, there is a problem that cleaning the tube barb becomes extremely complicated.

The present invention aims to solve the above problems.

(Means for Solving the Problems) The tube burner of the present invention has an inner end wall formed at the distal end of the inner tube inserted into the outer tube to close the distal end, and a flame contact portion of the inner tube with respect to the inner tube. The effective heating section formed between the vicinity and the inner end wall has an appropriate number of communication holes through which the combustion gas flows out from the effective heating section into the combustion gas flow path.

(Function) The tip of the inner tube inserted into the outer tube is closed with the inner end wall, the inner end wall blocks the gap between the tip of the outer tube and the flame, and the combustion gas in the inner tube is The combustion gas flows out into the flow path between the inner tube and the 7th tube through an appropriate number of communication holes provided between the vicinity of the flame contact part of the inner tube and the inner end wall, and the combustion gas flows into the outer tube. Heat the entire tube evenly.

(Effects of the Invention) Since the present invention is configured as described above, it eliminates the problem that the tip of the outer tube is heated by flame and causes burnout and physical property deterioration of the tip of the outer tube to be accelerated, thereby improving the durability of the outer tube. In addition, it has the effect of eliminating the problem of uneven surface temperature distribution of the outer tube due to localized high temperature near the tip of the outer tube, and evening out the surface temperature distribution of the outer tube.

Furthermore, since most of the oxidized scale remains inside the inner tube, the cleaning work only requires removing the oxidized scale inside the inner tube, which simplifies the cleaning work inside the tube burner.

(Example) Next, one embodiment of the present invention will be described with reference to the drawings.

In a single-end type tube burner B that is vertically attached to the upper wall 1a of the furnace chamber 1 and passing through the upper wall 1a, an exhaust gas pipe 4 is connected to the exhaust port 2a at the upper end thereof.
A useful cylindrical inner cylinder body 2 connected through an air supply port 3a and a covered cylindrical outer cylinder body 3 to which an air supply conduit 5 is connected through an air supply port 3a are arranged side by side inside and outside.

Upper wall 1 of the furnace chamber 1 for heating the object to be heated in the furnace chamber 1
The bottomed cylindrical outer tube 6 attached to a and inserted into the chi furnace chamber 1 is connected to the inner cylinder 2 and the outer tube with its inner circumferential surface closely aligned with the inner circumferential surface of the inner cylinder 2. It is connected to the lower part of the cylindrical body 3.

The bottomed cylindrical inner tube 7 that is vertically installed inside the outer tube 6 has its tip spaced apart slightly above the outer end wall 6a of the outer tube 6, and is free to move into the inner cylinder body 2 and the outer tube 6. It is inserted in a fitted manner, and its upper end communicates with the vicinity of the upper end inside the outer cylinder 3 in order to supply combustion air into the inner tube 7, and at the same time supplies city gas, etc. to the inside near the upper part. Fuel gas pipe line 10
A fuel supply pipe 9 connected to the fuel supply pipe 9 is inserted, and a fuel injection port for ejecting and burning fuel gas is opened at the tip of the fuel supply pipe 9, and a fuel injection port for stabilizing the flame is provided at the tip of the fuel supply pipe 9. A flame-holding tube 11 is provided in series for holding the flame.

A combustion gas flow path 12 is formed between the outer tube 6 and the inner tube 7, which communicates with the exhaust gas pipe 4 through the exhaust port 4a and allows the combustion gas burned within the inner tube 7 to flow upward. An inner end wall 73 is formed at the tip of the inner tube 7 to close the tip, and the inner end wall 13 blocks a gap between the tip of the outer tube 6 and the flame.

The combustion gas combusted within the inner tube 7 is transferred from the inside of the effective heating section 15 formed in the peripheral body of the inner tube 7 from the vicinity of the flame contact section 14 of the inner tube 7 to the inner end wall 13. Combustion gas flow path 1
A large number of round-shaped communication holes 16~
16 is installed through the inner end wall 1 from the vicinity of the flame contact part 14.
3 and are regularly arranged at equal intervals in the circumferential direction and axial direction, respectively, and the hole diameter of each communication hole 16 at the lower end in the figure is set so as to increase the amount of combustion gas flowing out from the tip of the inner tube 7. The diameter of the hole 16 is larger than that of the other communication holes 16 arranged above the hole 16 .

The combustion gas burned in the inner tube 7 is transferred to each circulation hole 16.
The combustion gas flows out from the effective heating section 15 into the combustion gas flow path 12 through the combustion gas flow path 12 and flows out through the combustion gas flow path 12 to the outer tube 6.
is heated and discharged into the exhaust gas pipe line 4 through the discharge port 2a, and the heat of the outer tube 6 heats the object to be heated in the furnace 1.

Next, the operation and effects of the embodiment having the above configuration will be explained.

In this example, an inner end wall 13 is formed at the tip of the inner tube 7 inserted into the outer tube 6 across a combustion gas passage 12 through which combustion gas flows, and an inner end wall 13 is formed to close the tip. The flame contact part 14
The effective heating section 15 formed between the vicinity and the inner end wall 13 has a large number of communication holes 16 through which the combustion gas flows out from inside the effective heating section 15 into the combustion gas passage 12.
It is installed through.

Therefore, the outer tube 6 is heated by the combustion gas flowing out from the inner tube 7 through each communication hole and flowing through the combustion gas passage 12, so that the tip of the outer tube 6 is heated by the flame and the outer tube 6 is heated by the flame. The problem of premature burnout and physical property deterioration of the tip has been resolved, improving the durability of the outer tube 6. At the same time, the temperature distribution on the surface of the outer tube 6 is uneven due to localized high temperatures near the tip of the outer tube 6. This problem is solved, and the surface temperature distribution of the lid tube 6 is evenly distributed.

Also, connect the tip of the inner tube 7 to the inner end I! 13
The oxidized scale generated on the inner wall surface of the inner tube 7 due to the blockage remains in the inner tube 7 and is not released into the outer tube 6, so when the inner tube is removed, most of the oxidized scale is removed. Since the outer tube can be cleaned without removing the outer tube, the interior of the tube burner B can be cleaned easily.

In addition, as shown in FIGS. 3(a), (b), and (c), an inner tube is provided with an appropriate number of vertically elongated slit-shaped communication holes 16A extending through the effective heating portion 15 along the axial direction. 7A, and an inner tube 7 in which an appropriate number of horizontally elongated slit-shaped circulation holes 16B are provided through the effective heating portion 15 along the circumferential direction.
B, an appropriate number of vertically slit-shaped communication holes 16G extending axially through the effective heating section 15, and a large number of round holes extending between each of the communication holes 160. An inner tube 7C having a distribution name 160 or the like may be worn instead of the inner tube 7 of the first embodiment.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention.
The figure is a longitudinal cross-sectional view, Figure 2 is a perspective view of the main part of the inner tube, and Figures 3 (a), (b), and (c) are perspective views of the main part of the inner tube showing the other side of the inner tube, respectively. , 4th
The figure is a longitudinal sectional view of a conventional tube burner. 6... Outer tube 7.7A, 78.70... Inner tube 12...
Combustion gas flow path 13... Inner end wall 14... Flame contact section 15... Effective heating section 16.16A, 168.160... Distribution hole 8... Tube burner

Claims (1)

[Claims] In a tube burner, a combustion gas flow path is formed in the gap between an outer tube and an inner tube inserted into the outer tube to circulate and discharge the combustion gas burned in the inner tube. forms an inner end wall that closes the tip of the inner tube, and directs combustion gas from within the effective heating section to the effective heating section formed between the inner tube's flame contact area and the inner end wall. A tube burner characterized by having an appropriate number of flow holes through which the combustion gas flows out into the flow path.