CN217877068U

CN217877068U - Be applied to melting furnace's low nitrogen burning rifle

Info

Publication number: CN217877068U
Application number: CN202221689414.6U
Authority: CN
Inventors: 钟子锋
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-11-22
Anticipated expiration: 2032-06-30

Abstract

The utility model discloses a be applied to melting furnace's low nitrogen burning rifle, include: the gun body is arranged on the furnace body and comprises an inner pipe for conveying fuel gas and an outer pipe sleeved outside the inner pipe; a primary air channel for conveying primary air is formed between the inner pipe and the outer pipe; the furnace is characterized in that the inner tube is connected with an air injection rod, the air injection rod is provided with a plurality of air injection holes, a secondary air channel for conveying air is communicated with the furnace body, and an air outlet of the secondary air channel and an air outlet of the primary air channel form an acute angle. Primary air that primary air passageway carried is at jet-propelled pole periphery and gas co-combustion, and secondary air passageway carries secondary air to jet-propelled pole periphery and becomes the acute angle with the primary air gas outlet for secondary air and primary air collision intersect, make air and gas mix more evenly, adopt secondary air combustion mode simultaneously, make the burning more abundant.

Description

Be applied to melting furnace's low nitrogen burning rifle

Technical Field

The utility model relates to a non ferrous metal melting furnace combustion apparatus technical field especially relates to a be applied to low nitrogen burning rifle of non ferrous metal melting furnace.

Background

The non-ferrous metal melting furnace comprises a crucible furnace and a reverberatory furnace. The burner for heating non-ferrous metal melting furnace generally adopts a burning gun, and is a device for spraying fuel and air in a certain mode for mixed combustion. The existing combustion gun comprises an inner pipe and an outer pipe, wherein the outer pipe is sleeved on the inner pipe, and an annular channel is formed between the inner wall of the outer pipe and the outer wall of the inner pipe; the annular channel is used for conveying air, the inner pipe is used for conveying natural gas, and the annular channel and the inner pipe are mixed at the jet orifice and then jet flame; however, because the fuel is not mixed sufficiently, the temperature of the flame ejected by the burning gun is low, the combustion temperature in the kiln is difficult to ensure, the fuel at the edge is not combusted due to insufficient fuel mixing, the divergence degree is low, and the temperature in the kiln is uneven.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model aims to provide a have secondary air, burn more abundant be applied to melting furnace's low nitrogen burning rifle.

In order to achieve the above purpose, the utility model adopts the following technical scheme.

A low-nitrogen combustion lance for use in a melting furnace, comprising: the gun body is arranged on the furnace body and comprises an inner pipe for conveying fuel gas and an outer pipe sleeved outside the inner pipe; a primary air channel for conveying primary air is formed between the inner pipe and the outer pipe; the furnace is characterized in that the inner tube is connected with an air injection rod, the air injection rod is provided with a plurality of air injection holes, a secondary air channel for conveying air is communicated with the furnace body, and an air outlet of the secondary air channel and an air outlet of the primary air channel form an acute angle.

As a further explanation of the above scheme, a negative pressure tail gas suction pipeline is communicated with the furnace body, and the other end of the negative pressure tail gas suction pipeline is communicated with the secondary air channel.

As a further explanation of the above scheme, a fire distribution baffle is mounted on the air injection rod, and the air injection hole is divided into an upper part and a lower part by the fire distribution baffle.

As a further explanation of the above scheme, the number of the air injection rods is one or more, and a buffer cavity for mounting the air injection rods is arranged on the inner pipe.

As a further explanation of the scheme, the furnace body is communicated with an exhaust pipe for exhausting the exhaust gas.

As a further explanation of the above solution, the exhaust pipe is connected to a heat exchanger, which is also connected to the secondary air channel.

As a further explanation of the above scheme, a tail gas outlet communicated with the tail gas pipe and a secondary air inlet communicated with the secondary air channel are arranged on the heat exchanger, and a fan is arranged on the secondary air inlet or the secondary air channel.

As a further explanation of the above scheme, an ignition needle and a flame signal probe are mounted on the gun body, tops of the ignition needle and the flame signal probe are located at the periphery of the gas injection rod, and signal lines of the ignition needle and the flame signal probe penetrate out of the gun body through the primary air channel to be connected with external equipment.

As a further explanation of the above scheme, a gun core for plugging the primary air channel is arranged at the bottom of the outer tube, the inner tube penetrates through the gun core so that a fuel gas inlet is formed at the bottom of the inner tube, and a primary air inlet is arranged on the side wall of the outer tube.

The beneficial effects of the utility model are that.

1. Primary air that primary air passageway carried is at jet-propelled pole periphery and gas co-combustion, and secondary air passageway carries secondary air to jet-propelled pole periphery and becomes the acute angle with the primary air gas outlet for secondary air and primary air collision intersect, make air and gas mix more evenly, adopt secondary air combustion mode simultaneously, make the burning more abundant.

2. The tail gas is recycled, and the air and the recycled tail gas are mixed to form secondary air which enters the furnace body to be mixed with the fuel gas to recycle the tail gas, so that the combustion is more sufficient, the fuel loss is reduced, the generation of nitrogen oxides is effectively reduced, and the environment protection and energy conservation are facilitated.

3. The heat exchanger is adopted to transfer the heat of the discharged tail gas to the secondary air, so that the temperature of the secondary air is improved, and the heat efficiency is improved.

Drawings

FIG. 1 is a side view of a low-nitrogen combustion lance for a non-ferrous metal melting furnace according to the present invention.

Fig. 2 is a front view of the low-nitrogen combustion gun applied to the non-ferrous metal melting furnace according to the present invention.

Fig. 3 is a schematic view of the installation structure of the low-nitrogen combustion gun applied to the non-ferrous metal melting furnace.

Reference numerals indicate the same.

1: inner tube, 2: gun core, 3: primary air inlet, 4: outer tube, 5: ignition needle, 6: fire dividing baffle, 7: air injection rod, 8: flame signal probe, 9: gas injection hole, 10: secondary air passage, 11: negative pressure tail gas suction pipe, 12: tail gas pipe, 13: tail gas outlet, 14: furnace wall, 15: crucible, θ: acute angle.

Detailed Description

In the description of the present invention, it should be noted that, for the orientation words, if there are terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and positional relationship indicated are based on the orientation or positional relationship shown in the drawings, and only for the convenience of describing the present invention and simplifying the description, it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and not be construed as limiting the specific scope of the present invention.

Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and in the description of the invention, "at least" means one or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "assembled", "connected", and "connected", if any, are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; the two elements can be directly connected with each other or connected with each other through an intermediate medium, and the two elements can be communicated with each other. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless otherwise specified or limited, "above" or "below" a first feature may include the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other through another feature therebetween. Also, the first feature being "above," "below," and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply an elevation which indicates a level of the first feature being higher than an elevation of the second feature. First feature "above", "below" and "under" second feature may include first feature being directly below or obliquely below the second feature, or merely indicating that the first feature is at a lower level than the second feature.

The following description will further describe embodiments of the present invention with reference to the drawings of the specification, so that the technical solutions and the advantages of the present invention will be more clear and definite. The embodiments described below are exemplary and are intended to be illustrative of the present invention, but should not be construed as limiting the invention.

As shown in fig. 1 to 3, a low-nitrogen combustion lance for use in a melting furnace includes: a gun body mounted on the furnace body 14, the gun body comprising: the gas burner comprises an inner pipe 1 for conveying gas and an outer pipe 4 sleeved outside the inner pipe 1, wherein a primary air channel for conveying air into the furnace body is formed between the inner pipe 1 and the outer pipe 4; the furnace is characterized in that the inner tube 1 is connected with an air injection rod 7, the side wall of the air injection rod 7 is provided with a plurality of air injection holes 9, the furnace body 14 is communicated with a secondary air channel 10 for conveying air, and the air outlet of the secondary air channel 10 and the air outlet of the primary air channel form an acute angle theta. Like this, at the during operation, the primary air that primary air passageway carried is at jet-propelled pole periphery and gas co-combustion, and secondary air passageway carries secondary air to jet-propelled pole periphery and becomes the acute angle with the primary air gas outlet for secondary air and primary air collision cross, make air and gas mix more evenly, adopt secondary air inlet combustion mode simultaneously, make the burning more abundant.

The furnace body 14 is communicated with a negative pressure exhaust gas suction pipeline 11, and the other end of the negative pressure exhaust gas suction pipeline 11 is communicated with the secondary air channel 10. Negative pressure tail gas suction pipe 11 is used for circulating tail gas, and air and circulating tail gas mix and form secondary air and get into in the furnace body and mix the reuse tail gas with the gas for the burning is more abundant, reduces the fuel loss, effectively reduces nitrogen oxide and produces, does benefit to environmental protection, energy saving.

The bottom of the outer pipe 4 is provided with a gun core 2 for plugging the primary air channel, and the inner pipe penetrates through the gun core so that the bottom of the inner pipe forms a fuel gas inlet. And a primary air inlet 3 is arranged on the side wall of the outer pipe.

In addition, a fire distribution baffle 6 is mounted on the air injection rod 7. The fire distribution baffle 6 divides the gas injection hole into an upper part and a lower part.

An ignition needle 5 and a flame signal probe 8 are mounted on the gun body. The tops of the ignition needle 5 and the flame signal probe 8 are positioned on the periphery of the air injection rod 7, and the signal wires of the ignition needle 5 and the flame signal probe 8 penetrate out of the gun body through the primary air channel to be connected with external equipment.

The number of the air injection rods 7 is one or more. In this embodiment, preferably, the number of the air injection rods 7 is multiple, and a buffer cavity is arranged at the top of the inner tube 1 for installing the multiple air injection rods. The gas injection holes 9 are preferably circular holes, and the gas injection holes 8 are uniformly distributed on the gas injection rod 7. Obviously, those skilled in the art can change the number of the air injection rods and the shape and arrangement of the air injection holes according to actual needs, and the present invention is not limited to this embodiment, and the solution in this embodiment is only a preferred choice.

Referring to fig. 3, in this embodiment, a crucible furnace is taken as an example, a crucible 15 is disposed in the furnace body 14, and the furnace body 14 is a wall. The furnace body 14 is communicated with an exhaust pipe 12 for discharging exhaust gas, the exhaust pipe 12 is connected with a heat exchanger, and the heat exchanger is also connected with the secondary air channel 10, so that the secondary air is heated in the heat exchanger, the temperature of the secondary air is improved, and the heat efficiency is improved. The heat exchanger is provided with a tail gas outlet 13 communicated with the tail gas pipe 12 and used for discharging tail gas and a secondary air inlet communicated with the secondary air channel 10, and the secondary air inlet is provided with a fan used for conveying secondary air into the furnace body.

In this embodiment, the air outlet of the secondary air channel 10 is arranged at an angle of 45 degrees to the air outlet of the primary air channel. Of course, the size of θ can be designed by those skilled in the art according to the size of the furnace body, as long as the primary air and the secondary air can collide and meet each other.

It will be understood by those skilled in the art from the foregoing description of the structure and principles that the invention is not limited to the specific embodiments described above, and that modifications and substitutions based on known techniques in the art are intended to fall within the scope of the invention, which is defined by the claims and their equivalents. The details not described in the detailed description are prior art or common general knowledge.

Claims

1. A low-nitrogen combustion lance for use in a melting furnace, comprising: the gun body is arranged on the furnace body and comprises an inner pipe for conveying fuel gas and an outer pipe sleeved outside the inner pipe; a primary air channel for conveying primary air is formed between the inner pipe and the outer pipe; the furnace is characterized in that the inner tube is connected with an air injection rod, the air injection rod is provided with a plurality of air injection holes, a secondary air channel for conveying air is communicated with the furnace body, and an air outlet of the secondary air channel and an air outlet of the primary air channel form an acute angle.

2. The low-nitrogen combustion gun for the melting furnace as claimed in claim 1, wherein a negative pressure exhaust gas suction line is connected to the furnace body, and the other end of the negative pressure exhaust gas suction line is connected to the secondary air channel.

3. A low-nitrogen combustion lance for a melting furnace as set forth in claim 1, wherein a distributor plate is installed on the lance, and the distributor plate divides the lance hole into upper and lower portions.

4. The low-nitrogen combustion gun for a melting furnace as claimed in claim 1, wherein the number of the gas injection rods is one or more, and a buffer chamber for mounting the gas injection rods is provided on the inner tube.

5. The low-nitrogen combustion lance for a melting furnace as claimed in claim 1, wherein the furnace body is connected to an exhaust pipe for exhausting exhaust gas.

6. A low nitrogen combustion lance in a melting furnace as set forth in claim 5 wherein a heat exchanger is connected to said offgas duct, said heat exchanger being further connected to said secondary air passage.

7. The low nitrogen combustion lance of claim 6, wherein the heat exchanger has a tail gas outlet in communication with the tail gas pipe and a secondary air inlet in communication with the secondary air channel, and a blower is disposed at the secondary air inlet or the secondary air channel.

8. The low-nitrogen combustion gun for a melting furnace as claimed in claim 1, wherein an ignition needle and a flame signal probe are mounted on the gun body, the top of the ignition needle and the top of the flame signal probe are located at the periphery of the gas injection rod, and signal wires of the ignition needle and the flame signal probe penetrate out of the gun body through the primary air channel and are connected with external equipment.

9. The low nitrogen combustion gun for a melting furnace as claimed in claim 1, wherein a core for blocking the primary air passage is provided at a bottom of the outer tube, the inner tube is provided through the core such that a gas inlet is formed at a bottom of the inner tube, and a primary air inlet is provided at a side wall of the outer tube.