JPH0622716U - Combustion cylinder for gas burner - Google Patents

Abstract

(57) [Summary] [Purpose] The tip of the refractory metal combustion tube can be replaced as a separate fired refractory nozzle, and the combustion tube can be used for a long time simply by replacing the nozzle to improve economic efficiency. Also, several types of nozzles having different drawing ratios can be prepared and replaced as needed. [Structure] A fire-resistant refractory nozzle 2 in which a tip hole 3 having an arbitrary diameter is formed at the tip of a refractory metal combustion cylinder 1 is detachably attached.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a combustion cylinder for a high-load combustion gas burner used in an industrial furnace.

[0002]

[Prior art]

 In the early days, as the combustion cylinder of the high-load combustion gas burner installed in the conventional industrial furnace, the refractory combustion cylinder A shown in Fig. 6 was the mainstream, but there were frequent cracks due to spalling, and the combustion cylinder was frequently replaced. Therefore, heat-resistant metal combustion tubes, which do not crack due to spalling, are now widely used.

[0003]

[Problems to be solved by the device]

 However, in a heat-resistant metal combustion tube, the drawn part and the straight part are integrally formed of heat-resistant cast steel, but because it is a metal, the drawn part at the tip contacting the furnace is oxidized by heat load or high heat generated during burning. There is a risk that it will disappear or in the worst case it may melt, the service life is short, and since it is made of cast metal, its wall thickness must be thick, and the specific gravity is large, so the combustion cylinder is very heavy. Therefore, even if only the tip-throttled part is oxidized and melted, it is necessary to replace it with a new one, which is uneconomical and heavy to replace, so it is not easy to handle.

Furthermore, in order to change the performance of the gas burner, it is uneconomical to prepare several types of combustion cylinders with different inner diameters of the first throttle portion.

In this invention, the places where the refractory metal combustion cylinder is oxidized or melted are limited to the squeezing part at the tip from experience, and the straight part is not damaged. Therefore, the squeezing part at the tip is a separate part. It is not removable as a fired refractory nozzle, it can be used economically by simply replacing the nozzle and the combustion cylinder can be used for a long time, and the weight of the combustion cylinder can be reduced, which is convenient for handling, and the inside diameter and drawing ratio are different. It is an object of the present invention to provide a combustion cylinder for a gas burner in which several types of nozzles are prepared and can be replaced as needed to change the performance of the gas burner.

[0006]

[Means for Solving the Problems]

 The combustion cylinder for a gas burner of the present invention relates to a technical means for detachably attaching a fired refractory nozzle 2 having a refractory metal combustion cylinder 1 formed with a tapered hole 3 having an arbitrary diameter.

[0007]

[Action]

 According to this structure, the fired refractory nozzle 2 is inserted into the tip of the refractory metal combustion tube 1 and is attached with an adhesive, screws, etc. to form a combustion tube, which is connected to the gas burner body for use. . The fired refractory nozzle 2 can be removed and replaced with a new nozzle at the end of its useful life. The performance of the gas burner can be changed by replacing the nozzle with a nozzle having a different diameter and a different drawing ratio.

[0008]

【Example】

 In FIGS. 1 and 2, reference numeral 1 denotes a heat-resistant metal combustion cylinder, the heat-resistant metal cover 1a is integrally welded to the tip, and a mounting hole 4 is provided at the tip of the cylinder. Since the combustion cylinder 1 is made of heat-resistant cast steel, it has a large wall thickness and becomes heavy. Therefore, use a refractory metal with a thickness of 4 to 5 mm.

Reference numeral 2 denotes a fired refractory nozzle, which has an outer diameter as shown in FIGS. 3 and 4 so that it can be inserted into the combustion cylinder 1, and a concave surface 5 for an adhesive is provided on the outer peripheral surface thereof. The tapered hole 3 having an arbitrary diameter D is formed. Since the nozzle is originally made of heat-resistant cast steel at a temperature that it can withstand to some extent, it is not necessary to have a high degree of fire resistance. It can be completely eliminated and can be used for a long period of time. The fired refractory nozzles shown in FIGS. 3 and 4 have different diameters D, that is, a small diameter and a large diameter, but the nozzles are not limited to this, and the nozzle length, diameter, etc. can be changed to restrict the throttle. Prepare several types of nozzles with different ratios.

Then, the firing refractory nozzle 2 is inserted into the refractory metal combustion cylinder 1, and the ceramic adhesive 6 is adhered to the concave surface 5 and the gap formed between the combustion cylinder 1 and the nozzle 2. The fixing screw 7 is screwed into the mounting hole 4 and attached to form a combustion cylinder.

FIG. 5 shows an example of a gas burner used in an industrial furnace. Reference numeral 8 is a gas introduction head, 9 is an air introduction head, 10 is a gas pipe, 11 is a pilot mixed gas pipe, and 12 is a flame stabilizer. The combustion cylinder of this invention is connected to the air introduction head for use.

With the above-mentioned structure, when the firing refractory nozzle 2 reaches the end of its useful life, or when it is damaged due to heat load, etc., the stop screw 7 is removed, and the combustion screw 1 is removed. It can be replaced with a new nozzle 2. Further, when the performance of the gas burner is changed, the diameter of the nozzle 2 and the throttle ratio of the combustion cylinder 1 can be changed to obtain a combustion cylinder suitable for the burner.

[0013]

[Effect of device]

 According to the combustion cylinder of the present invention, only the throttle portion at the tip where heat load is easily applied is the firing refractory nozzle. Therefore, even if heat load is applied, oxidation and melting do not occur, the service life is long, and the nozzle It is economical because only the nozzle can be replaced when it reaches the end of its useful life or when it is damaged by heat load.

Further, if the combustion cylinder is made of a heat-resistant metal, the wall thickness can be made thin, so that the weight becomes considerably light, the handling is easy, and the manufacturing cost can be reduced. Furthermore, it is easy to manage because only the firing refractory nozzle is in stock, and if you prepare several types of nozzles with different diameters, lengths, and drawing ratios, you can use them according to the performance of the gas burner and the furnace. Optimal combustion cylinder can be installed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a combustion cylinder for a gas burner according to the present invention.

FIG. 2 is a vertical sectional view showing a heat-resistant metal combustion cylinder.

FIG. 3 is a vertical cross-sectional view showing an example of a fired refractory nozzle.

FIG. 4 is a vertical sectional view showing a nozzle made of a fired refractory having different diameters.

FIG. 5 is a vertical sectional view showing a gas burner to which a combustion cylinder of the present invention is attached.

FIG. 6 is a vertical cross-sectional view showing a conventional refractory combustion cylinder.

[Explanation of symbols]

 1 Combustion tube made of heat-resistant metal 2 Nozzle made of fireproof refractory 3 Pre-throttled hole

Claims (1)

[Scope of utility model registration request] 1. A combustion cylinder for a gas burner to which a nozzle (2) made of fired refractory having a pre-throttled hole (3) of an arbitrary diameter formed at the tip of a refractory metal combustion cylinder (1) is detachably attached.