JPH0792211B2 - Chiubebana - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tube burner used in a metal heating furnace, a melting furnace and the like, and more particularly to a single end type tube burner.

(Prior Art) A tube burner used in a conventional metal heating furnace, aluminum melting furnace, or the like is configured to heat an outer tube with a combustion gas and heat an object to be heated or a material to be melted by the heat of the outer tube. Was there.

(Problems to be solved by the invention) In the case of the above tube burner, the outer tube is apt to be damaged by thermal stress due to repeated heating, thermal shock at the time of ignition or extinguishing, or strength is easily deteriorated. There is a problem that the characteristics and temperature distribution are likely to be non-uniform, and this problem is particularly noticeable in the case of a ceramic tube.

It is an object of the present invention to provide a tube burner which can solve the above problems and improve heat transfer characteristics and heat dissipation.

(Means for Solving the Problems) The present invention provides a heating medium in which heat-resistant particles are gathered in an inner combustion chamber and an outer combustion chamber formed inside and outside an inner tube arranged in parallel in an outer tube. The gist of the invention is a tube burner housed in order to move up and down in the outer combustion chamber by combustion gas flowing from the inner combustion chamber into the outer combustion chamber.

(Operation) The present invention stores a heating medium in which heat-resistant particles are gathered in a burner body in which an inner tube and an outer tube are arranged inside and outside, and at the time of combustion, the heating medium is stored in the inner combustion chamber of the burner body. To the outer combustion chamber, the heat of the heating medium that moves up and down in the outer combustion chamber is conducted to the outer tube.

(Example) Next, an example in which the present invention is embodied as a single-ended tube burner for a metal heating furnace or a non-ferrous metal melting furnace will be described with reference to the drawings.

The burner body 1 of the tube burner B installed for charging into the furnace chamber has an outer tube 2 having a cylindrical shape with a bottom, and the lower end edge of the outer tube 2 is the outer tube 2
And an inner tube 3 that is concentrically inserted in a state of being separated slightly above the bottom surface of the inner tube 3 and is arranged in parallel. The inner tube 3 is formed at the upper end of an inner combustion chamber 4 formed in the inner tube 3 for injecting fuel. Fuel pipe 6 inserted near the upper end
And an air supply pipe 7 connected to the upper end of the inner tube 3 to supply air around the injected fuel, while being formed between the outer tube 2 and the inner tube 3 to form internal combustion. At the upper end of the outer combustion chamber 5 communicating with the lower end of the chamber 4, an exhaust pipe 8 connected to the upper end of the outer tube 2 for discharging combustion gas is arranged.

The heating medium 9 in which heat-resistant particles such as alumina particles, alumina hollow particles, and silicon carbide particles are aggregated is heated by the combustion gas flowing from the inside combustion chamber 4 to the outside combustion chamber 5 to the outside combustion chamber 5.
An internal combustion chamber 4 and an external combustion chamber 5 for moving up and down inside
When the fuel is ignited and the combustion gas is circulated from the inside combustion chamber 4 into the outside combustion chamber 5, a part of the heating medium 9 inside the inside combustion chamber 4 is generated by the gas pressure of the combustion gas. The heating medium 9 in the external combustion chamber 5 is extruded into the external combustion chamber 5, and the heating medium 9 in the external combustion chamber 5 is repeatedly levitated and dropped by the gas pressure of the combustion gas to move up and down in the external combustion chamber 5. In this state, the combustion gas is heated by the heating medium 9. Through which the heating medium 9 is entirely red-heated, and the heat of the heating medium 9 is conducted to the outer tube 2. However, the above-mentioned combustion gas is a generic term for a complete combustion gas and a gas during combustion in which non-combustion gas, air and the like are mixed in addition to the complete combustion gas.

Then, the flow region L of the heating medium 9 during the flow of the combustion gas
In the case of the non-ferrous metal melting furnace Y shown in FIG. 6, it is set so as to substantially match the immersion depth of the burner body 1 in the melted object H, and the metal heating furnace K shown in FIG. In this case, the outer tube 2 is set so as to substantially match the required heating length, and the space between the outer tube 2 and the inner tube 3 increases the chance of contact between the flowing heating medium 9 and the outer tube 2. The heat of the heating medium 9 is transferred to the outer tube 2
In order to effectively transmit it, the distance is set to be relatively small.

Next, as an example of the ignition method in the tube burner B, when the stationary heating medium 9 is converted into a flowing state, the gas pressure P is set to the time T as shown in FIGS. 4 (a) and 4 (b). Since it decreases from P1 to P2 with the passage of time and the flow rate Q of the combustion gas sharply increases from Q1 to Q2, for example, after confirming the flow start of the heating medium 9, the fuel supply amount and the air supply amount are adjusted. Ignition method to ignite, or to increase the initial air pressure to flow the heating medium 9 only by the air pressure, and when the heating medium 9 starts to flow and the air pressure decreases, the reduced air pressure is detected and the air is detected. After adjusting the supply amount, an ignition method in which fuel is supplied to ignite the fuel, or the heating medium 9 is vertically moved up and down by secondary air to confirm the start of flow of the heating medium 9, An ignition system or the like for supplying and igniting fuel is adopted.

As shown in FIG. 3, the inner tube 3 has a double-tube structure to form a secondary air flow path 10 outside the inner combustion chamber 4 to cool the inner tube 3 and to simultaneously cool the inner combustion chamber 4
The secondary air may be supplied to the inner bottom portion to completely burn the combustion gas.

Next, the operation and effect of the embodiment having the above-mentioned configuration will be described.

Now, in this example, the inner and outer combustion chambers 4,5 formed inside and outside the inner tube 3 juxtaposed inside the outer tube 2 respectively.
Near the bottom of the heating medium 9 with heat-resistant granules
Are housed in order to move up and down in the outer combustion chamber 5 by the combustion gas flowing from the inner combustion chamber 4 into the outer combustion chamber 5.

Therefore, the outer tube 2 is uniformly heated over the entire flow region L of the heating medium 9 by the behavior of the heating medium 9 that moves up and down in the outer combustion chamber 5 in a red heat state, and the heating state of the outer tube 2 is changed to that of the burner body 1. The heating region of the burner body 1 can be concentrated in the flow region L by the ascending / descending behavior of the heating medium 9 that has been red-heated, while the temperature distribution in the heat transfer region can be balanced over the entire heat transfer region.
The amount of heat radiated from the flow region L of is increased as compared with the conventional tube burner to improve the heat transfer characteristics of the burner body 1.
In the case of a melting furnace, the material to be melted can be effectively melted, and in the case of a heating furnace, heat can be effectively conducted to the material to be heated to save energy.

Further, the thermal stress that the outer tube 2 receives due to repeated heating and the thermal shock that the outer tube 2 receives when igniting and extinguishing are alleviated by the heating medium 9 flowing in the outer combustion chamber 5,
Outer tube 2 with improved durability of outer tube 2
Of the ceramic tube can be suppressed, and this effect is particularly remarkable in the case of the ceramic tube.

(Effects of the Invention) That is, the present invention provides a heating medium in which heat-resistant granules are gathered in the inner combustion chamber and the outer combustion chamber formed inside and outside the inner tubes arranged in parallel in the outer tube, respectively. The temperature distribution in the heat transfer area of the burner body can be made uniform by accommodating the combustion gas flowing from the combustion chamber into the outer combustion chamber so as to move up and down in the outer combustion chamber. This has the effects of increasing the heat transfer characteristics of the burner body and improving the durability of the outer tube by relaxing the thermal stress and thermal shock to the outer tube.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a vertical cross-sectional view of a tube burner, FIG. 2 is a vertical cross-sectional view showing a state during combustion, and FIG. 3 shows another example of the inner tube. A longitudinal sectional view, FIGS. 4 (a) and 4 (b) are respectively a curve diagram showing changes in gas pressure and gas flow rate over time, and FIG. 5 is a longitudinal sectional view showing an example in which a tube burner is applied to a heating furnace. FIG. 6 is a longitudinal sectional view showing an example similarly applied to a melting furnace. 2 ... Outer tube 3 ... Inner tube 4 ... Inner combustion chamber 5 ... Outer combustion chamber 9 ... Heating medium

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Yamada 19-18 Sakurada-cho, Atsuta-ku, Nagoya, Aichi Prefecture Toho Gas Co., Ltd. (56) Reference JP-A-52-125831 (JP, A) JP 58-28915 (JP, A) JP-A 61-272517 (JP, A)

Claims (1)

[Claims] 1. A heating medium in which heat-resistant granules are gathered in an inner combustion chamber and an outer combustion chamber formed inside and outside an inner tube arranged in parallel in the outer tube, respectively. A tube burner, which is housed for moving up and down in the outer combustion chamber by a combustion gas flowing into the combustion chamber.