JPS6115391Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heating furnace, and particularly to improving combustion conditions.

A heating furnace is a device that burns fuel using a burner in a combustion chamber made of steel or the like, and heats solid or liquid with the generated combustion, and is used in various fields including petroleum refining and the petrochemical industry. Generally, such heating furnaces are equipped with multiple burners within the combustion chamber, but under normal operating conditions, some burners are switched on as appropriate without burning all the burners. Fires are often extinguished. However, since the burner is equipped with an inlet for combustion air, air that does not contribute to combustion flows into the combustion chamber from the air inlet of the burner when it is extinguished, increasing the temperature of this air that does not contribute to combustion. This resulted in a very uneconomical situation.

Conventionally, therefore, it has been common practice to reduce the overall amount of air flowing into the combustion chamber by narrowing down the damper provided in the chimney. However, when the damper is narrowed down, the amount of combustion air sucked into the burner during combustion decreases, resulting in deterioration of the combustion state and the generation of carbon sludge. In addition, in some cases, the joints in the firebricks that make up the combustion chamber are filled in order to reduce the amount of air that does not contribute to combustion that flows into the combustion chamber, but this does not reduce the amount of air that flows into the combustion chamber from the burner when it is extinguished. However, it did not effectively reduce the inflow of air that does not contribute to combustion.

An object of the present invention is to provide a heating furnace that maintains a good combustion state even when some of the burners are extinguished and activated, and does not require modification of devices such as burners.

In the present invention, when a burner is extinguished, an air inlet or an opening into the furnace formed integrally with the burner can be covered, and when the burner is covered, the air inlet or opening is closed and the inside of the furnace is covered. By providing a means for blocking air inflow into the burner, the above object is achieved by preventing the inflow of excess air that does not contribute to combustion from the burner during extinguishing, and also improving the suction of air into the burner during combustion. It is something.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the main parts of the heating furnace according to the present invention. In this figure, a plurality of cylindrical burner attachment ports 2 are installed on a horizontal flat hearth 1 having a predetermined thickness. It is installed through floor 1.

A cylindrical secondary tile 3 having a predetermined thickness is fitted into each of the burner installation ports 2, and a cylindrical burner support 4 with a bottom is placed on the lower end side of the hearth 1 on the lower end side of the secondary tile 3. More installed. The upper edge of the burner support 4 is fixed along the periphery of the burner attachment port 2 on the lower end surface of the hearth 1, and a secondary air inlet 5 is bored in the circumferential surface of the burner support 4. , the inside and outside of the furnace are communicated through a secondary air inlet 5.

In addition, a small cylindrical primary tile 6 is installed in the center of the bottom surface of the burner support 4, and the bottom surface of the burner support 4 is opened within the primary tile 6. A burner gun support 7 having an approximately inverted cone shape is attached to the lower edge of the primary tile 6 facing downward so as to be approximately continuous with the lower edge of the primary tile 6.

A primary air inlet 8 is bored in the circumferential surface of the burner gun support 7, and the primary air inlet 8 communicates between the inside and outside of the furnace. Further, a burner gun 9 is supported on the burner gun support 7 so as to be positioned along the center line of the primary tile 6.
Fuel is supplied to the burner gun from a fuel pipe 10 connected to the lower end of the burner gun support 7.

Among the plurality of burners configured in this way, a burner that is extinguished is equipped with a lid member 1 as an air blocking means.
1 is installed. The lid member 11 has a disk-shaped flange portion 11A having a larger diameter than the burner installation port 2.
and a fitting portion 11 that is integrally formed on the lower end surface of the flange portion 11A and that can be fitted into the secondary tile 3.
B, and is configured so that when the cover member 11 is attached to the burner attachment port 2, the opening of the burner into the furnace is closed.

A hook 12 is provided protruding from the upper end surface of the lid member 11, and a locking portion 13A (see FIG. 2) on the tip side of the operating rod 13 can be locked onto the hook 12. By inserting the cover member 11 into the furnace through a viewing window or manhole (not shown) and operating it, the cover member 11 can be attached to and removed from the burner installation port 2 as appropriate, that is, the opening into the furnace can be covered. ing. The lid member 11 and the operating rod 13 are made of a fireproof material, and the reference numeral 14 in FIG. 1 is a centaur.

Next, the operation of this embodiment will be explained.

A cover member 11 is attached to the burner during extinguishing, and the primary air inlet 8 and the secondary air inlet 5
No air flows into the furnace. On the other hand, the amount of air flowing into the primary and secondary air inlets 8 and 5 of the burner during combustion increases. This is because even if the throttle of the chimney damper remains the same, if the number of air inflow points is reduced, the amount of air flowing into each of the remaining inflow points will inevitably increase. Therefore, the combustion state of the burner during combustion is improved.

When operating the burner while switching, the attachment point of the lid member 11 may be appropriately moved using the operating rod 13 even during operation.

This embodiment has the following effects.

Excess air is now prevented from flowing in from the air inlets 8 and 5 of the burner during extinguishing. For example, in a heating furnace with a total of 40 burners, when 16 burners are extinguished and operated, the lid member 1
4.0% in the air flowing into the furnace when 1 is not used
This did not contribute to combustion and lowered the temperature inside the furnace, but when the lid member 11 was used, this was reduced to 1.5%. In addition, the amount of air sucked into each of the remaining 24 burners during combustion was increased, which resulted in very good combustion conditions, no carbon flour, and a reduction in fuel usage. That is, FIG. 3 shows the results of hourly measurements of the amount of fuel used per unit product when the lid member 11 is used and when it is not used. It can be seen that a reduction in fuel consumption of 0.92/Kl is achieved.

In particular, the lid member 11 has a simple structure, can be easily applied to existing heating furnaces, and has excellent workability because the mounting location can be changed as appropriate during operation.

Therefore, since the lid member 11 is separate from a heating furnace device such as a burner, the lid member 11 can be attached without modifying an existing burner.
Furthermore, when the lid member 11 is attached to the burner attachment port 2, the opening of the burner into the furnace is closed, so the air in the burner attachment port 2 no longer participates in combustion, and from this point as well Air inflow is blocked. Moreover, scale does not adhere to the burner opening that is closed by the lid member 11, and combustion efficiency does not deteriorate even if the burner opening is opened to the lid member 11 and combustion is performed again.

In the above embodiment, the air blocking means was the cover member 11, but as in another embodiment shown in FIG. air inlet 8,
It may also be a shielding shell 21 that surrounds and seals 5. This cutoff shell 21 can be divided into two parts, and the two parts are integrated by a stopper 22 and attached to the outer circumferential side of the burner during extinguishing. Further, the air blocking means is slidably held on the burner support 4 and the burner gun support 7, and the secondary air inlet 5 and the secondary air inlet 5 and 1 as appropriate.
The second air inlet 8 may be made of a small plate-like blocking plate that can close and open the air inlet 8. In short, air can flow in from the extinguished burner regardless of whether it is from the inside of the furnace or the outside of the furnace. It is sufficient as long as it prevents.

Furthermore, although the burner has been described above as a so-called premixed gas burner, it may be of any other type, such as an oil-gas co-firing type.

As described above, according to the present invention, it is possible to provide a heating furnace that maintains a good combustion state even when operated with some of the burners extinguished, and does not require modification of devices such as burners.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of a main part of an embodiment of a heating furnace according to the present invention, Fig. 2 is a perspective view showing an operating rod used in the embodiment, and Fig. 3 is a perspective view of the embodiment. FIG. 4 is a diagram illustrating the effect of reducing fuel consumption in comparison with a conventional example, and FIG. 4 is a perspective view showing a main part of an embodiment other than the above. DESCRIPTION OF SYMBOLS 1... Hearth, 2... Burner installation port, 5... Secondary air inlet, 8... Primary air inlet, 9... Burner gun, 11... Lid member as air blocking means,
13...operation rod, 21...blocking shell as air blocking means.

Claims (1)

[Claims for Utility Model Registration] (1) In a heating furnace equipped with a plurality of burners, an air inlet or an opening into the furnace formed integrally with the burner during extinguishing can be covered. A heating furnace characterized in that air blocking means is provided for blocking the air inlet or opening to block the air inlet into the furnace during coating. (2) Utility Model Registration The heating furnace according to claim 1, wherein the air blocking means is a lid member that closes an opening of a burner into the furnace.