JP2001004110A - Slit type burner for drying and heating and method of combustion control thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dry and heat refractory material formed oblong like a trough uniformly with a heat pattern corresponding to the characteristic of the refractory material. SOLUTION: Piping is arranged for feeding fuel gas to the inner cylinder 2 and combustion air to the outer cylinder 4 of a header 1 consisting of the triple cylinder of the inner cylinder 2, a middle cylinder 3 and the outer cylinder 4. The blowout nozzles 2a of the fuel gas are arranged on the inner cylinder 2 at predetermined intervals in the direction of the length, the blowout nozzles 6 of the fuel gas are arranged on the middle cylinder 3 at the predetermined intervals in the direction of the length, and the blowout nozzles 7 of the combustion air are arranged covering over the blowout nozzles 6 at the positions of the blowout nozzles 6 and a slit nozzle 11 having the same length with the header 1 is arranged surrounding these blowout nozzles 6 and 7 on the outer cylinder. A swirl vane is arranged between each of the blowout nozzles 6 and the blowout nozzles 7. With this, the refractory material including moisture formed oblong as the trough can be dried and heated without spalling or rupture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for drying a refractory, which is constructed in an elongated shape such as a gutter, uniformly from a room temperature to a high temperature in a predetermined heat pattern according to the refractory properties. The present invention relates to a drying / heating slit-type burner device for heating and a combustion control method thereof.

[0002]

2. Description of the Related Art In drying and raising the temperature of a refractory containing water, for example, in Japanese Utility Model Laid-Open No. 52-153704, after setting a mold, a flame is blown with a burner to transfer heat through the form. And dry,
In No. 9, burners are appropriately arranged and integrated on the ceiling of the gutter cover, and are dried by completely burning by compressed air or external suction. Japanese Utility Model Application Laid-Open No. 61-155354 and Japanese Utility Model Application Laid-Open No. 62-11154. In Japanese Patent Application Laid-Open No. H11-157, there is disclosed an apparatus which is dried by a high-temperature medium derived from an insulated pipe. All of these are dried and heated from the surface of the refractory.

[0003] However, in the case of a refractory containing moisture that is dried and heated from the surface, spalling and explosion are likely to occur when the temperature of the refractory is rapidly increased. Therefore,
In order to gradually remove the moisture inside, it is necessary to burn with an excessive amount of excess air (high air ratio) and dry and raise the temperature from room temperature in a heat pattern according to the characteristics of the refractory.

In Japanese Patent Publication No. 63-54996,
The burner burns at a high air-fuel ratio in the low temperature range of the heating pattern, and switches to a low air-fuel ratio in the high temperature range to dry and raise the temperature by burning the burner.
In No. 2069, the initial stage of drying is burning at a high air ratio,
Thereafter, a method has been proposed in which the air ratio is gradually lowered, and in the middle and later stages of drying, the air is burned at an air ratio of about 1 to dry.

[0005]

However, as in Japanese Patent Publication No. 63-54996 and Japanese Patent Publication No. 7-52069, even when the air ratio is changed when the refractory is dried and heated. However, when applied to refractories constructed in an elongated shape like a gutter, unevenness in drying and heating occurs, and uniform drying and heating cannot be performed. If uniform drying and heating cannot be performed, spalling and explosion are likely to occur as described above.

Japanese Patent Publication No. 53-28166 discloses a refractory which is heated from the inside by using microwaves. According to this method, spalling or explosion does not occur even when the refractory containing moisture is dried and heated, but since heating using microwaves requires large-scale equipment, it requires on-site installation. There is a problem in the handling etc.

[0007] The present invention has been made in view of the above-mentioned problems, and even a refractory constructed in a slender and long shape like a gutter can be uniformly dried with a heat pattern according to the characteristics of the refractory. It is an object of the present invention to provide a drying and heating slit-type burner device which does not cause spalling or explosion by heating, and a combustion control method thereof.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention relates to a triple-cylinder header, in which an inner cylinder is provided with fuel gas injection holes at predetermined intervals in the longitudinal direction. Further, the intermediate cylinder has a fuel gas ejection nozzle at a predetermined interval in the longitudinal direction, and the outer cylinder has the combustion air in an externally fitted state at the ejection nozzle installation position of the intermediate cylinder. Nozzles, and slit nozzles of the same length as the header are provided to surround these nozzles, and swirl vanes are interposed between the fuel gas nozzles and the combustion air nozzles. I have. By doing so, a uniform flow rate of fuel gas is blown from each of the large number of spray nozzles, mixed with the combustion air blown out by being swirled by the swirling blades, and uniform in the longitudinal direction. A flame is formed. At this time, while supplying combustion air according to the maximum combustion capacity, the supply amount of the fuel gas is increased or decreased according to a heat pattern according to the refractory characteristics.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The slit / burner device for drying and heating according to the present invention comprises a triple cylinder header comprising an inner cylinder, an intermediate cylinder, and an outer cylinder. In addition to piping for supplying combustion air, the inner cylinder is provided with fuel gas ejection holes at predetermined intervals in the longitudinal direction, and the intermediate cylinder is provided with fuel gas ejection holes at predetermined intervals in the longitudinal direction. In the outer cylinder, at the installation position of the intermediate nozzle, at the installation position of the intermediate cylinder, a combustion air injection nozzle which is fitted over the injection nozzle, and a fuel gas injection nozzle and a combustion air injection nozzle Slit nozzles of the same length as the header are provided so as to surround the nozzles, and swirling vanes are interposed between the respective fuel gas ejection nozzles and combustion air ejection nozzles.

In the drying / heating-type slit burner apparatus of the present invention, the fuel gas is introduced into the annular space formed by the inner cylinder and the intermediate cylinder from the ejection hole of the inner cylinder once through the inner cylinder. A uniform flow rate of the fuel gas is supplied to the space in the longitudinal direction, and a uniform flow rate of the fuel gas is blown out from a large number of ejection nozzles. On the other hand, the combustion air is swirled by the swirling blades, blows out from the annular space formed by the outer cylinder and the intermediate cylinder, passes through each ejection nozzle, and is mixed with the fuel gas. Therefore, a uniform flame is formed in the slit nozzle in the longitudinal direction.

In the above-mentioned slit / burner device for drying and heating according to the present invention, while supplying combustion air in accordance with the maximum combustion capacity from the outer cylinder, the inner cylinder is provided with a heat pattern corresponding to the refractory characteristics. Increase or decrease the flow rate of the supplied fuel gas. This is the combustion control method for the drying / heating slit-type burner device of the present invention.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A drying / heating slit-type burner according to the present invention will be described below with reference to an embodiment shown in FIGS. 1 and 2. FIG. The invention extends to the combustion control method of the present invention. FIG. 1 is a front view partially showing the whole of a drying / heating slit-type burner device of the present invention, FIG. 2 (a) is a side view of FIG. 1, and FIG. 2 (b) is a sectional view of a header portion. .

In FIGS. 1 and 2, reference numeral 1 denotes a header constituting a drying / heating slit-type burner apparatus of the present invention, in which an inner tube 2, an intermediate tube 3, and an outer tube 4 are coaxially arranged. It has a triple cylinder configuration. A pipe is provided so that fuel gas can be supplied to the inner cylinder 2 and combustion air can be supplied to the outer cylinder 4.

By the way, for example, on both sides of the inner cylinder 2,
Fuel gas ejection holes 2a are provided at predetermined intervals in the longitudinal direction, and the fuel gas supplied to the inner cylinder 2 is formed by the inner cylinder 2 and the intermediate cylinder 3 from these ejection holes 2a. It is blown out to the space 5.

An opening 3a is provided below the longitudinal position of the intermediate cylinder 3 corresponding to the middle of the ejection hole 2a.
A fuel gas ejection nozzle 6 is attached to the opening 3a. Therefore, the fuel gas blown from the inner cylinder 2 into the annular space 5 is blown from the jet nozzle 6 attached to the opening 3a.

That is, the fuel gas is once guided through the inner cylinder 2 from the ejection hole 2a of the inner cylinder 2 to the annular space 5 formed by the inner cylinder 2 and the intermediate cylinder 3, so that the annular space 5 has a longitudinal direction. In addition, since a uniform flow rate of fuel gas is supplied, and in addition, since each ejection nozzle 6 of the intermediate cylinder is provided between the ejection holes 2a, a more uniform flow rate of fuel gas is ejected from each ejection nozzle 6. .

An opening 4a is provided in the outer cylinder 4 at the position where the ejection nozzle 6 of the intermediate cylinder 3 is installed, and a combustion air ejection nozzle 7 is provided so that the ejection nozzle 6 is fitted to the opening 4a. Is installed. Therefore, the combustion air supplied to the intermediate position in the longitudinal direction of the annular space 9 formed by the outer cylinder 4 and the intermediate cylinder 3 via the pipe 8 passes through the space between the two ejection nozzles 6 and 7, and A swirl is imparted by a swirling vane 10 interposed between the nozzles 6 and 7 to be blown out and mixed with the fuel gas.

The mixed gas of the fuel gas and the combustion air has the same length as the header 1 provided on the outer cylinder 4 so as to surround the fuel gas ejection nozzle 6 and the combustion air ejection nozzle 7. The flame is ignited in the slit nozzle 11 and a uniform flame is formed in the longitudinal direction.

In the embodiment shown in FIG. 1, two drying / heating slit-type burner devices of the present invention having the above-described configuration are arranged in series, and both inner cylinders 2 are connected by a connecting pipe 12 so that one of the two inner cylinders 2 is connected. Cylinder 2
Although fuel gas is supplied to the other inner cylinder 2 from the other, and combustion air is supplied to the intermediate portion between the two outer cylinders 4 via the pipe 8, it goes without saying that it may be an integral structure. No.

FIG. 4 and FIG. 5 show the combustion characteristics of the drying / heating slit-type burner apparatus of the present invention having the above-described structure. When the flow rate of the combustion air is constant, the combustion characteristics are shown in FIG. Thus, it can be seen that the ambient temperature increases as the fuel gas flow rate increases. On the other hand, as shown in FIG. 5, when the flow rate of the fuel gas is constant, good combustion can be obtained even when the air ratio is increased to 15.

As described above, in the drying / heating slit-type burner device of the present invention, the ratio (air ratio) of fuel gas to combustion air (air ratio) and the turn-down ratio can be increased, and this characteristic is utilized. Thus, while supplying combustion air to the outer cylinder 4 according to the maximum combustion capacity, the supply amount of the fuel gas is increased or decreased in a heat pattern according to the refractory characteristics. This is the combustion control method for the drying / heating slit-type burner device of the present invention.

That is, according to the combustion control method of the drying / heating slit-type burner device of the present invention, spalling or explosion does not occur even in a refractory constructed in a slender and long shape like a gutter. From the normal temperature to the high temperature, the same burner can be used to dry the refractory and raise the temperature.

By the way, six drying / heating slit-type burners of the present invention having the structure shown in FIG. 1 are arranged in series, and these are connected to the gutter 1 via the canopy 14 as shown in FIG.
3, the refractory in the gutter 13 was dried and heated.

In the combustion control at this time, first, the pilot burner is ignited, the flame stability of the pilot burner is checked by a flame detector, and then the outer cylinder of the drying / heating slit type burner apparatus of the present invention is used. 4 was supplied with combustion air according to the maximum combustion capacity.

The fuel gas (coke oven gas) was supplied one by one while supplying the combustion air in the above-described amount, and the fuel gas was ignited by a pilot burner. After igniting all the six burners, the temperature of the gutter 13 is measured by thermocouples embedded in each point of the gutter 13 and the supply amount of the fuel gas is adjusted so that these measured temperatures have a predetermined heat pattern. did.

The monitoring of the combustion was performed by setting a signal from the flame detector when the pilot burner misfired, and closing the shut-off valve attached to the fuel gas pipe by this signal.

Using the drying / heating slit-type burner apparatus of the present invention as described above, the combustion control method of the present invention
When the gutter was dried and heated, no spalling or explosion occurred.

[0028]

As described above, according to the present invention,
Since any temperature control from normal temperature to high temperature can be easily performed, even a refractory containing moisture can be dried and heated without spalling or explosion. Further, in the present invention, since a long slit-like uniform flame can be formed, even a refractory constructed in a slender and long shape like a gutter can be uniformly dried and heated.
In addition, since the burner device of the present invention does not have a large-scale configuration, on-site setup and installation can be easily performed, and work time can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing, in partial cross section, the entirety of a drying / heating slit-type burner device of the present invention.

2A is a side view of FIG. 1, and FIG. 2B is a sectional view of a header portion.

FIG. 3 is a diagram showing a state in which a tapping gutter of a blast furnace is dried and heated using the slit type burner device for drying and heating according to the present invention.

FIG. 4 shows the combustion characteristics of the drying / heating slit-type burner device of the present invention, and shows the relationship between the fuel gas flow rate and the ambient temperature when the flow rate of combustion air is constant.

FIG. 5 is a graph showing combustion characteristics of the drying / heating slit type burner device of the present invention, showing the relationship between the air ratio and the ambient temperature when the flow rate of the fuel gas is constant.

[Explanation of symbols]

 Reference Signs List 1 header 2 inner cylinder 2a ejection hole 3 intermediate cylinder 4 outer cylinder 6 ejection nozzle 7 ejection nozzle 10 swirl vane 11 slit nozzle

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // C21B 7/14 302 C21B 7/14 302 F27D 3/14 F27D 3/14 A (72) Inventor Kadota Norio 1850 Minato, Wakayama City, Wakayama Prefecture Sumitomo Metal Industries, Ltd.Wakayama Works (72) Inventor Kunihiro Yabawa 1850 Minato, Wakayama City, Wakayama Prefecture BA04 BB02 BD01 3L113 AB05 AC04 BA00 CA08 CA14 CA20 CB02 DA04 DA11 DA24 4K015 EC09 4K051 AA01 AA05 AB00 LG03 4K055 AA01 JA03

Claims (2)

[Claims] 1. A three-cylinder header comprising an inner cylinder, an intermediate cylinder, and an outer cylinder. A fuel gas is supplied to an inner cylinder and a combustion air is supplied to an outer cylinder. Direction of the fuel gas ejection holes at predetermined intervals in the direction, the intermediate cylinder is provided with the fuel gas ejection nozzles at predetermined intervals in the longitudinal direction, and the outer cylinder is provided with the intermediate cylinder. At the ejection nozzle installation position, a combustion air ejection nozzle is provided externally to the ejection nozzle, and a slit nozzle of the same length as the header is provided so as to surround the fuel gas ejection nozzle and the combustion air ejection nozzle. A slit-type burner for drying and heating, wherein a swirl vane is interposed between each fuel gas ejection nozzle and combustion air ejection nozzle. 2. The drying and heating-up slit type burner device according to claim 1, wherein the combustion air is supplied from the outer cylinder in accordance with the maximum combustion capacity, and the internal combustion is performed in a heat pattern according to the refractory characteristics. A combustion control method for a drying / heating slit-type burner device, characterized by increasing or decreasing the flow rate of fuel gas supplied from a cylinder.