JP3029680U - Automatic ignition type oxygen burner for rotary melting furnace - Google Patents

Abstract

(57) Abstract: It is possible to automatically ignite an oxygen burner in a rotary melting furnace, easily attach to the rotary melting furnace, and maintain high heat insulation of the rotary melting furnace. A cylindrical furnace body of a rotary melting furnace rotates around a cylinder axis. An auto-ignition type oxygen burner (10) is provided on the lid (21) of the furnace body. Oxygen burner (10) burner nozzle
A fuel gas passage (3) is formed inside the inner cylinder (2) of (1), and a fuel gas supply source is connected to the fuel gas passage (3). The space between the inner cylinder (2) and the outer cylinder (4) of the burner nozzle (1) is connected to the oxygen passage.
(5), and an oxygen supply source is connected to the oxygen passage (5). Ignition gas pipe (6) for passing a mixture of fuel gas and air
Is provided in the oxygen passage (5), and the tip of the ignition gas pipe (6) is connected to the tip of the fuel gas passage (3). Then, the air-fuel mixture from the ignition gas pipe (6) is ignited by the spark plug (7), and the combustion of the air-fuel mixture is used as a pilot flame to flow from the fuel gas passage (3) into the furnace (2
The fuel gas ejected to (0) is burned.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to an improvement of an oxygen burner used in a rotary melting furnace that melts a raw material such as cast iron while rotating the furnace body.

[0002]

[Prior art]

 BACKGROUND ART Conventionally, a rotary melting furnace that rotates a cylindrical furnace body is known as a melting furnace that melts raw materials such as cast iron, aluminum and other non-ferrous metals by flame radiation. In this rotary melting furnace, for example, as disclosed in Japanese Patent Laid-Open No. 7-294157, an opening is provided at the end of the furnace body in the cylindrical axis direction, and the opening is opened and closed by a lid.

Then, an oxygen burner is provided in the lid, and the fuel gas and oxygen gas ejected from the oxygen burner are burned to melt the raw material in the rotating furnace by the heat of the flame. are doing.

[0004]

[Problems to be solved by the device]

 However, in the conventional rotary melting furnace, since the above gas was manually ignited, a small amount of fuel gas and oxygen gas was discharged from the oxygen burner with the lid open and the oxygen burner exposed outside the furnace. Each of them was ejected, and the gas was manually ignited, and then the lid was closed.

That is, the fuel gas and the oxygen gas are jetted from the oxygen burner in order to maintain the ignition state from the ignition to the closing of the lid. Does not contribute to melting. Therefore, the gas utilization rate decreases by the amount of gas consumed between the ignition and the closing of the lid.

On the other hand, it is possible to ignite the oxygen burner in the furnace by providing an ignition device together with the oxygen burner on the lid. In this case, the amount of fuel gas and oxygen gas necessary for melting the raw material in the furnace body can be jetted from the oxygen burner immediately after ignition and burned. Since it will be attached to the body, it will take time and effort to attach it.

Further, it is preferable to make the lid smaller in terms of heat insulation of the rotary melting furnace, but since the oxygen burner and the ignition device are provided in the lid, the lid can be made smaller. Without reducing the heat insulation of the rotary melting furnace.

The present invention provides a rotary melting furnace that can automatically ignite an oxygen burner in the rotary melting furnace, can be easily attached to the rotary melting furnace, and can maintain high heat insulation of the rotary melting furnace. It is an object of the present invention to provide an auto ignition oxygen burner.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is configured as follows, for example, as shown in FIGS. That is, a rotary melting furnace having a cylindrical furnace body (19) rotatable about a cylinder axis and an oxygen burner (10) provided at an end (21) of the furnace body (19) in the cylinder axis direction. In the above, the burner nozzle (1) of the oxygen burner (10) is formed as an inner and outer double cylinder, and the inner cylinder (2) of the burner nozzle (1) is formed as a fuel gas passage (3) to form a fuel gas passage (3). The fuel gas supply source (16) is connected, and the space between the inner cylinder (2) and the outer cylinder (4) of the burner nozzle (1) is formed in the oxygen passage (5) to supply oxygen to the oxygen passage (5). A source (17) is connected, an ignition gas passage (6) for passing a mixture of fuel gas and air is provided in the oxygen passage (5), and the tip of the ignition gas passage (6) is connected to the fuel gas passage (6). 3), and an ignition device (7) is provided at the connecting portion between the ignition gas passage (6) and the fuel gas passage (3).

[0010]

[Action]

 The auto-ignition type oxygen burner of the present invention operates as follows, for example, as shown in FIGS. After the raw material is charged into the furnace (20) of the rotary melting furnace, a mixture of fuel gas and air is supplied to the ignition gas passage (6) of the oxygen burner (10). By operating the ignition device (7) in that state, the air-fuel mixture is ignited by the ignition device (7) at the connection between the ignition gas passage (6) and the fuel gas passage (3), It burns as a pilot fire in the fuel gas passage (3).

Next, when the fuel gas is supplied into the fuel gas passage (3) and the oxygen gas is supplied into the oxygen passage (5), the fuel supplied into the fuel gas passage (3) is supplied. Gas spouts into the furnace (20) of the rotary melting furnace. At that time, a part of the fuel gas is mixed with air contained in the air-fuel mixture from the ignition gas passage (6) and burned by the seed flame, and a flame is ejected into the furnace (20) together with the seed flame. Let

Then, in the furnace (20), the fuel gas from the fuel gas passage (3) is mixed with the oxygen gas from the oxygen passage (5) and burned by the flame. The combustion heat at that time melts the raw material in the furnace (20) of the rotary melting furnace. At that time, the raw material and the molten metal are stirred and heat is transferred by rotating the furnace body (19).

[0013]

[Effect of device]

 The present invention has the following effects because it is configured and operates as described above. Since the oxygen burner can be automatically ignited in the rotary melting furnace, the fuel gas and oxygen gas ejected from the oxygen burner into the furnace are burned immediately after the oxygen burner is ignited to burn the rotary melting furnace. The raw material in the furnace can be melted, the fuel gas and the oxygen gas can be prevented from being wasted, and the reduction of the gas utilization rate can be suppressed.

That is, in the conventional method of manually igniting the oxygen burner, the fuel gas and the oxygen gas ejected little by little from the oxygen burner are manually ignited with the lid provided with the oxygen burner opened. After that, the lid is closed. Therefore, the fuel gas and the oxygen gas must be ejected to maintain the ignition state until the lid is closed, and the gas utilization rate is reduced.

On the other hand, according to the present invention, the fuel gas and the oxygen gas ejected from the oxygen burner into the furnace of the rotary melting furnace can be burned immediately after the ignition of the oxygen burner to start the melting of the raw materials in the furnace. Therefore, the fuel gas and the oxygen gas can be effectively used.

Moreover, the ignition gas passage is provided in the oxygen passage in the burner nozzle, and the tip of the ignition gas passage is connected to the fuel gas passage so that the fuel gas ejected from the fuel gas passage to the outside of the burner nozzle is ignited. Since the ignition of the air-fuel mixture supplied from the working gas passage to the fuel gas passage is enabled, the oxygen burner can be used simply by attaching the burner nozzle to the rotary melting furnace, and the ignition device can be rotated separately from the burner nozzle. The work of attaching to the melting furnace can be omitted.

Further, since only the burner nozzle is attached to the rotary melting furnace, the space for disposing the oxygen burner can be reduced, and the lid body provided with the oxygen burner can be reduced in size. Therefore, it is possible to reduce heat radiation from the lid body provided with the oxygen burner and to maintain the heat insulation of the rotary melting furnace at a high level.

When the flame detection device arranged at the base end of the fuel gas passage is configured to detect the combustion of the air-fuel mixture supplied into the fuel gas passage, only the work of attaching the burner nozzle to the rotary melting furnace is required. Thus, the combustion of the air-fuel mixture can be detected without attaching the flame detection device to the rotary melting furnace separately from the burner nozzle.

Further, when the combustion of the air-fuel mixture supplied into the fuel gas passage is detected by the flame detection device, the oxygen on-off valve and the fuel gas on-off valve are opened and the air-fuel mixture open / close valve is closed. When the valve is operated, the fuel gas and the oxygen gas are ejected into the rotary melting furnace before the mixture gas from the ignition gas passage to the fuel gas passage is burned, or the furnace of the rotary melting furnace is blown. The combustion of the air-fuel mixture from the ignition gas passage to the fuel gas passage is prevented from continuing despite the combustion of the fuel gas inside. As a result, it is possible to prevent wasteful use of the combustion gas and the oxygen gas.

[0020]

[Embodiment of device]

 An embodiment of an automatic ignition type oxygen burner for a rotary melting furnace according to the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a vertical cross-sectional view of the oxygen burner, FIG. 2 is a vertical cross-sectional view showing a main part of the rotary melting furnace, and FIG. 3 is a schematic configuration diagram showing a gas pipe and a control system of the oxygen burner.

As shown in FIG. 2, the furnace body (19) of the rotary melting furnace has a substantially cylindrical shape having conical portions at both ends, and the openings (24) (25) are provided at the tips of these conical portions. ) Are provided respectively. A lid (21) is arranged to be openable and closable in one of the openings [on the right side in FIG. 2] (24), and the burner nozzle (1) of the oxygen burner (10) is provided in the lid (21). Is attached. A duct (31) is arranged opposite to the other opening (25), and exhaust gas in the furnace (20) of the rotary melting furnace is discharged by the duct (31).

Further, the furnace body (19) is rotationally driven about the cylindrical axis of the furnace body (19) by the rotation driving means (23). That is, the rotation drive means (23) has a drive motor (29) and two drive rollers (30) interlockingly connected to the drive motor (29), and the drive roller (30). Thus, the furnace body (19) is rotationally driven via two circular flanges (28) provided around the furnace body (19).

Further, a base (not shown) is provided on the side of the furnace body (19), and by the base, the furnace body (19) can drive the drive motor (29) and the drive roller ( Together with 30), it can be tilted around a horizontal axis perpendicular to the cylindrical axis of the furnace body (19).

The inner wall of the furnace body (19) is made of refractory material. A tap hole (26) is formed in one of the conical parts (right side in FIG. 2) of the furnace body (19). The tap hole (26) is formed in a slightly oblique direction with respect to the rotation axis of the furnace body (19), and the clay-like sealing material (before the raw material is charged into the furnace (20) ( It is sealed by 27).

Next, a detailed configuration of the oxygen burner (10) will be described with reference to FIGS. 1 and 3. That is, as shown in FIG. 1, the burner nozzle (1) of the oxygen burner (10) is formed of an inner and outer double cylinder, and the tip portion [the left side in FIG. 1] of the burner nozzle (1) is rotated as described above. It is projected into the furnace (20) of the melting furnace.

A space between the inner cylinder (2) and the outer cylinder (4) of the burner nozzle (1) is formed by forming a fuel gas passage (3) inside the inner cylinder (2) of the burner nozzle (1). Is formed in the oxygen passage (5). The fuel gas passage (3) and the oxygen passage (5) are connected to the inside of the rotary melting furnace through the openings (3a) (5a) formed in the front end wall (1a) of the burner nozzle (1) ( 20).

An ignition gas pipe [ignition gas passage] (6) is inserted into the oxygen passage (5), and the tip of the ignition gas pipe (6) is connected to the fuel gas passage (3). It is connected to the tip [left side in Fig. 1]. An ignition plug [ignition device] (7) is provided at the connection between the ignition gas pipe (6) and the fuel gas passage (3).

Further, a flame detection device (8) is arranged at the base end [right side in FIG. 1] of the fuel gas passage (3) outside the furnace. The flame detection device (8) detects an ignition pilot burning at the tip of the fuel gas passage (3) through the space in the fuel gas passage (3), and a solenoid valve (to be described later) ( The flame due to the combustion of the fuel gas supplied into the fuel gas passage (3) from the fuel gas supply source (16) via (11) is detected.

Thus, the ignition gas pipe (6) is arranged in the burner nozzle (1), and the flame detection device (8) is arranged at the base end of the burner nozzle (1) outside the furnace. The oxygen burner (10) is more compact than when the ignition gas pipe (6) and the flame detector (8) are attached to the lid (21) of the rotary melting furnace separately from the burner nozzle (1). As a result, the attachment to the lid body (21) is facilitated, and the space for disposing the oxygen burner (10) in the lid body (21) can be reduced.

Further, as shown in FIG. 3, the fuel gas passage (3) is connected to a fuel gas supply source (16) via an electromagnetic valve [fuel gas opening / closing valve] (11), and the oxygen gas The passage (5) is connected to an oxygen supply source (17) via a solenoid valve [oxygen on-off valve] (12).

On the other hand, the ignition gas pipe (6) is connected to a fuel gas supply source (16) and an air supply source (18) via a solenoid valve [mixture opening / closing valve] (13) (14). The fuel gas and the air are mixed in the ignition gas pipe (6). Incidentally, liquefied gas fuel such as liquefied petroleum gas or liquefied natural gas is applied to the above fuel gas.

The solenoid valves (11) to (14) are connected to a control device [control means] (9), and the control device (9) includes the flame detection device (8). The spark plug (7) is connected. The spark plug (7) generates a spark by, for example, electric discharge, and the spark ignites the air-fuel mixture flowing from the ignition gas pipe (6) into the fuel gas passage (3).

Then, the control device (9) operates the ignition plug (7) and opens / closes the solenoid valves (11) to (14) according to the flame detection result of the flame detection device (8). Control motion and

The opening (5a) of the oxygen passage (5) is formed so as to surround the opening (3a) of the fuel gas passage (3) and is inclined toward the opening (3a) side. Formed (see Figure 1). As a result, oxygen gas is ejected from the opening (5a) of the oxygen passage (5) toward the fuel gas ejected from the opening (3a) of the fuel gas passage (3), and the furnace of the rotary melting furnace The mixing of fuel gas and oxygen gas in the inside (20) is promoted.

Next, the work of melting the raw materials in the rotary melting furnace having the above-mentioned configuration will be described. That is, prior to charging raw materials such as cast iron and non-ferrous metals into the inside of the rotary melting furnace (20), first, the lid (21) of one opening (24) of the rotary melting furnace is opened. The other opening (24) is closed by another cover plate (not shown), and the furnace body (19) is tilted so that the other opening (25) of the rotary melting furnace is on top.

In this state, after the raw material is charged through the other opening (25), the furnace body (19) is returned to the horizontal state. In this horizontal state, the other opening (25) is connected to the duct (31) (state in FIG. 2).

Then, after the other lid plate is removed from the one opening (24), the one opening (24) is closed by the lid body (21) to which the Bernoulli (1) is attached. Next, the solenoid valves (11) and (12) are closed by the control device (9), and the solenoid valves (13) and (14) are opened to open the ignition gas pipe in the burner nozzle (1). Fuel gas and air are supplied to (6). The control device (9) also activates the spark plug (7) in the burner nozzle (1).

Then, the fuel gas and the air are mixed and flow in the ignition gas pipe (6), and the fuel gas passage (3) is connected to the ignition gas pipe (6) at the connecting portion. It is ignited by the spark plug (7). As a result, the air-fuel mixture from the ignition gas pipe (6) burns as a pilot flame in the fuel gas passage (3).

When the generation of the seed fire is detected by the flame detection device (8), the solenoid valves (11) and (12) are opened by the control device (9), and the fuel gas is discharged. Fuel gas is supplied into the passage (3) and oxygen gas is supplied into the oxygen passage (5). Also, the operation of the above-mentioned spark plug (7) stops.

Then, the fuel gas supplied into the fuel gas passage (3) is ejected into the furnace (20) and mixed with the oxygen gas ejected from the oxygen passage (5), while the fuel gas is ejected. A part of the fuel gas supplied into the gas passage (3) is mixed with air contained in the air-fuel mixture from the ignition gas pipe (6) and burned in the fuel gas passage (3) by the pilot fire. Then, it becomes a flame together with the seed flame and spouts into the furnace (20).

As a result, the fuel gas ejected into the furnace (20) is burned by the flame, and the heat of combustion at that time starts melting the raw material in the furnace (20) of the rotary melting furnace. On the other hand, when the flame due to the combustion of the fuel gas supplied into the fuel gas passage (3) is detected by the flame detection device (8), the control device (9) causes the solenoid valves (13) (14). ) Are closed, the supply of fuel gas and air to the ignition gas pipe (6) is stopped, and the pilot fire is extinguished.

After that, the degree of opening and closing of the solenoid valves (11) and (12) is controlled by the control device (9), and the flame is optimized to melt the raw material in the furnace (20). To be done. Further, by rotating the furnace body (19), stirring and heat transfer of the raw material and the molten metal are performed.

When the melting of the raw material in the furnace (20) is completed, the rotation of the furnace body (19) is stopped, and then the sealing material (27) is removed from the tap hole (26). Hot water is discharged from the hole (26) to a trolley (not shown).

As described above, since the ignition of the oxygen burner (10) can be automatically performed with the lid (21) of the rotary melting furnace closed, the oxygen burner (10) is immediately ignited after the ignition of the oxygen burner (10). It is possible to start the melting of the raw material in the furnace (20) by burning the fuel gas and oxygen gas ejected from the furnace to the inside of the furnace (20), and to prevent the fuel gas and oxygen gas from being wasted. It can be prevented.

Further, until the pilot fire in the fuel gas passage (3) is detected by the flame detection device (8), the fuel gas and oxygen to the fuel gas passage (3) and the oxygen passage (5) are supplied. Since no gas is supplied, fuel gas and oxygen gas are prevented from being spouted into the furnace (20) of the rotary melting furnace before the ignition of the seed flame and wasteful use of combustion gas and oxygen gas is prevented. It

Further, when the fuel gas supplied into the fuel gas passage (3) is burned by the pilot fire and the flame is detected by the flame detection device (8), the pilot fire is automatically generated. Since the fuel gas has already burned in the above furnace (20), it is prevented that the ignition remains on and the combustion gas and oxygen gas are wasted. It is further prevented from being used.

The above embodiment can be modified as follows. That is, the position where the tip of the ignition gas pipe (6) in the oxygen burner (10) is connected to communicate with the fuel gas passage (3) is not limited to the tip of the fuel gas passage (3). Alternatively, it may be an intermediate portion or a base end portion of the fuel gas passage (3).

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of the oxygen burner showing an embodiment of an automatic ignition type oxygen burner of a rotary melting furnace according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a main part of the rotary melting furnace.

FIG. 3 is a schematic configuration diagram showing a gas pipe and a control system of the oxygen burner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Burner nozzle, 2 ... Burner nozzle inner cylinder, 3 ... Fuel gas passage, 4 ... Burner nozzle outer cylinder, 5 ... Oxygen passage, 6
... Ignition gas pipe (ignition gas passage), 7 ... Ignition plug (ignition device), 8 ... Flame detection device, 10 ... Automatic ignition type oxygen burner, 11 ... Solenoid valve (fuel gas opening / closing valve), 12 ... Solenoid valve (Oxygen on-off valve), 13/14 ... Solenoid valve (mixture on-off valve), 16 ... Fuel gas supply source, 17 ... Oxygen supply source, 19 ... Rotating melting furnace body, 20 ...
Inside the rotary melting furnace, 21 ... Lid (end of the rotary melting furnace).

Claims (3)

[Scope of utility model registration request] 1. A cylindrical furnace body (19) rotatable about a cylindrical axis, and an oxygen burner (10) provided at an end (21) of the furnace body (19) in the cylindrical axis direction. In the rotary melting furnace, the burner nozzle (1) of the oxygen burner (10) is formed by an inner and outer double cylinder, and the inner cylinder (2) of the burner nozzle (1) is provided with a fuel gas passage (3).
The fuel gas supply source (1
6) is connected to form a space between the inner cylinder (2) and the outer cylinder (4) of the burner nozzle (1) in the oxygen passage (5), and the oxygen supply source (5) is formed in the oxygen passage (5). 17) is connected, and an ignition gas passage (6) for passing a mixture of fuel gas and air is provided in the oxygen passage (5), and the tip of the ignition gas passage (6) is connected to the fuel gas passage. (3), and an ignition device (7) is provided at a connecting portion between the ignition gas passage (6) and the fuel gas passage (3). Automatic ignition type oxygen for rotary melting furnace, characterized in that Burner. 2. The automatic ignition type oxygen burner for a rotary melting furnace according to claim 1, wherein a flame detecting device (8) is arranged at a base end portion of the fuel gas passage (3), and the flame detecting device (8) is arranged. ), The combustion of the air-fuel mixture supplied from the ignition gas passage (6) into the fuel gas passage (3) is detected. An automatic ignition type oxygen burner for a rotary melting furnace, characterized in that 3. The automatic ignition oxygen burner for a rotary melting furnace according to claim 2, wherein an oxygen on-off valve (12) for opening and closing the oxygen passage (5) and a fuel for opening and closing the fuel gas passage (3). A control means for providing a gas on-off valve (11) and a mixture gas on-off valve (13) (14) for opening and closing the ignition gas passage (6) and controlling the on-off valves (11)-(14) (9) is provided and is configured to output the detection result of the flame detection device (8) to the control means (9), and the control means (9) controls the fuel gas in the flame detection device (8). When combustion of the air-fuel mixture supplied into the passage (3) is detected, the oxygen on-off valve (12) and the fuel gas on-off valve (11)
Open the valve and open / close the mixture opening / closing valves (13) (14)
An automatic ignition type oxygen burner for a rotary melting furnace, which is configured to perform a valve closing operation.