JP2002277171A - Heating furnace for regenerative burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating furnace for a regenerative burner capable of improving a temperature accuracy while preventing irregular burning of a material, increasing a thermal transmittance amount, avoiding a low temperature corrosion, restricting an increased NOx, and keeping a unit requirement of fuel and a heat recovery rate. SOLUTION: There is provided a heating furnace for a regenerative burner in which a regenerative burner 3 is fixed to a furnace main body 2, and a major circuit 4 for blowing air and sucking discharged gas is arranged to be communicated with the regenerative burner 3. An auxiliary circuit 5 for feeding the discharged gas to the furnace main body 2 is characteristically arranged to be branched from the major circuit 4, and the auxiliary circuit 5 is provided with a damper 20 for adjusting a feeding amount of the discharged gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a heating furnace for a regenerative burner.

[0002]

2. Description of the Related Art In a regenerative burner, while one burner main body is burning with high-temperature air heat-exchanged by a regenerator, the other burner main body inhales exhaust gas in a furnace main body, and after a lapse of a set time, The functions of combustion and intake of each burner main body are switched in the opposite manner.

However, since the heat recovery rate of the heat storage unit is good, the amount of exhaust gas is reduced when the inside of the furnace main body is maintained at the set temperature as compared with the case where another burner having a low heat recovery rate is used. Then, the exhaust gas does not sufficiently flow into the material,
Further, it becomes difficult to maintain the furnace pressure, and the outside air enters through a gap in the furnace main body, and as a result, the material may be unevenly baked. In particular, in the case of a trolley-type heating furnace, it is difficult to maintain the furnace pressure further because there is a gap for taking in and out of the trolley. Also,
When the size of the material is increased, it becomes more difficult for exhaust gas to flow around.

[0004] As a first measure to avoid these problems, the amount of exhaust gas suction is reduced with respect to the amount of gas combustion.
It is conceivable to keep the furnace pressure normal. However, there is a problem that the heat recovery rate in the heat accumulator decreases with a decrease in the exhaust gas suction amount, and further, various components cause low-temperature corrosion due to a decrease in the exhaust gas temperature after the heat accumulator.

As a second countermeasure, the mixing ratio of fuel and air is increased from the usual one-to-one to one-to-one to increase the amount of combustion gas, increase the flame speed, and maintain the furnace pressure and It is conceivable to achieve improved stirring capacity. However, there is a problem that Nox increases with an increase in the amount of air. At the same time, the fuel consumption increases with an increase in the amount of fuel accompanying an increase in the amount of air.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to improve the temperature accuracy, enhance the heat transfer amount, and reduce the low-temperature corrosion while preventing unevenness in the burning of the material. An object of the present invention is to provide a regenerative burner heating furnace capable of avoiding the above problem, suppressing the increase in Nox, and maintaining the fuel consumption rate and the heat recovery rate.

[0007]

According to the present invention, a regenerative burner is fixed to a furnace body, and a main circuit for feeding air and sucking exhaust gas is provided in communication with the regenerative burner. In a heating furnace for a tive burner, an auxiliary circuit for feeding exhaust gas into the furnace main body is provided branching from a main circuit, and the auxiliary circuit is provided with a damper for adjusting an amount of exhaust gas sent.

[0008] A regenerative burner is attached to the furnace body.
A set may be fixed, or a plurality of sets may be fixed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, a regenerative burner heating furnace according to the present invention is provided with a regenerative burner 3 attached to a furnace body 2 into and out of which a truck 1 enters and exits.
A main circuit 4 for fixing the set and sending air and sucking exhaust gas is provided in communication with the regenerative burner 3, and an auxiliary circuit 5 for sending exhaust gas to the furnace body 2 is provided in a branched manner in the main circuit 4. .

The regenerative burner 3 is a set of two units 8 in which the burner main body 6 and the heat storage unit 7 are integrated. The unit 8 burns by air from the main circuit 4 and fuel from another system. Do.

The furnace main body 2 is for placing a material 10 on a carriage 1 via a pillow 9 and not shown in the drawing.
Pillows 9 by arranging them at intervals in the depth direction.
Exhaust gas flows under the material from between. Further, the furnace main body 2 has two burner main bodies 6 fixed to an upper side surface thereof with a space therebetween, and performs flame injection and exhaust gas suction from the burner tile 11 opened in front of the burner main body 6. on the other hand,
On the ceiling surface and the lower side surface of the furnace body 2, through holes 12, which are ends of the auxiliary circuit 5, are provided at locations facing the burner tile 11 in the left-right direction, and exhaust gas is sent into the furnace body 2 from the through holes 12. . In addition, it is desirable that the feeding direction of the exhaust gas is adjusted to the traveling direction of the exhaust gas injected from the burner main body 6 in order to enhance the stirring flow effect.

When the main circuit 4 burns in one burner main body 6 and sucks exhaust gas from the other burner main body 6, the air flows from the intake blower 13 to the one regenerator 7 via the intake air amount adjusting damper 24. And the exhaust gas from the other regenerator 7 is sucked toward the exhaust blower 14 and sent to the chimney via the exhaust amount adjusting damper 23. After a lapse of a set time, the burners 6 and 6 perform the functions of combustion and suction. In the case of switching, air is sent from the intake blower 13 to the other regenerator 7 and exhaust gas is sucked from one regenerator 7 toward the exhaust blower 14.

More specifically, the intake blower 13
After the pipes are branched into two branches and connected to the regenerators 7, dampers 15 and 16 are provided in the middle of each pipe, and after the pipes are separately extended from the regenerators 7 and 7 to converge into one. Dampers 17 and 18 are provided in the middle of each pipe before being converged and connected to the exhaust blower 14. Then, the opening and closing of these dampers are automatically controlled to open the intake damper 15 communicating with one of the heat accumulators 7, close the exhaust damper 17, and operate the intake damper 16 communicating with the other heat accumulator 7. It is used to close and open the exhaust damper 18.

The auxiliary circuit 5 is provided with an orifice flow meter 19 branching from a pipe extending from the secondary side of the exhaust blower 14 to the exhaust amount adjusting damper 23, and a damper 20 for adjusting the amount of exhaust gas to be supplied. Further, it is connected to two through holes 12 of the furnace main body 2 through dampers 21 and 22 for branching and fine adjustment of the feeding amount. The damper 20 immediately after the orifice flow meter automatically changes the opening / closing amount in accordance with the detection result of the orifice flow meter, and the dampers 21 and 22 for fine adjustment may determine the opening / closing amount in advance. Good, or it may be adjusted automatically.

The heating furnace for the regenerative burner is controlled automatically, and the orifice flow meter 1 of the auxiliary circuit 5 is used until the inside of the furnace reaches a desired temperature and furnace pressure.
9, the damper 20 is closed, and the exhaust blower 14 is closed.
After the damper 23 on the secondary side is opened and combustion is performed only in the main circuit 4, after reaching a desired temperature and furnace pressure, the combustion is weakened and the opened damper 23 is closed slightly while the damper 20 is closed. And the exhaust gas is sent into the furnace main body 2 to shorten the material heating time.

The present invention is not limited to the above embodiment. For example, the through hole 12 at the end of the auxiliary circuit 5
May be provided only on one of the ceiling surface and the side surface of the furnace body 2.

[0017]

According to the heating furnace for regenerative burner of the present invention, the exhaust gas sucked into the main circuit is sent again into the furnace main body and the amount of the exhaust gas is adjusted by the damper. Even if
The furnace pressure can be maintained at an appropriate value, and the stirring ability in the furnace can be improved. As a result, it is possible to prevent unevenness in the burning of the material, improve the temperature accuracy, and enhance the heat transfer amount. In addition, since the exhaust gas is sent into the furnace body, the total exhaust gas amount
An increase in the x value can be suppressed. Further, since the main circuit itself is used as it is, the fuel consumption rate and the heat recovery rate can be maintained. By maintaining the exhaust gas amount, low-temperature corrosion of the main circuit can be avoided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a heating furnace for a regenerative burner according to the present invention.

FIG. 2 is a circuit diagram showing a heating furnace for a regenerative burner according to the present invention when viewed from a plane direction.

[Explanation of symbols]

 2 Furnace body 3 Regenerative burner 4 Main circuit 5 Auxiliary circuit 20 Damper

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) F27D 17/00 101 F27D 17/00 101Z 104 104A F term (reference) 3K023 QA03 QA04 QA18 QB18 3K065 TA01 TH09 TL02 4K056 AA08 BA02 BB01 DA02 DA27 DA32 DA36 DC17 FA03 FA06 FA08 4K063 AA08 AA13 CA01 CA02 CA03 DA08 DA13 DA14 DA15 DA32

Claims (1)

[Claims] A regenerative burner (3) is fixed to a furnace body (2), and a main circuit (4) for feeding air and sucking exhaust gas is provided in communication with the regenerative burner (3). In the regenerative burner heating furnace, an auxiliary circuit (5) for sending exhaust gas to the furnace body (2) is provided branching from the main circuit (4), and the auxiliary circuit (5) regulates the amount of exhaust gas sent. A heating furnace for a regenerative burner, comprising a damper (20).