CN219797194U - Novel combustor and metal melting furnace structure - Google Patents

Abstract

The utility model belongs to the technical field of burners, and particularly relates to a novel burner and a metal melting furnace structure. According to the novel burner disclosed by the utility model, the first stable flame air jet and the first auxiliary gas jet are mixed and ignited to form the first auxiliary flame combustion area, the second premixed combustion part further conveys the first auxiliary flame and the first unburned premixed jet in the first auxiliary flame combustion area to be mixed and combusted with the second auxiliary gas jet, a plurality of flame residence points with different vector directions and speeds can be generated through the interlacing, friction and collision of a plurality of streams to form the second auxiliary flame combustion area, a stable and reliable ignition source is formed and provided around the main flame combustion area, the condition of flame extinction and flameout is avoided, and the novel burner is reliable to use.

Description

Novel combustor and metal melting furnace structure

Technical Field

The utility model belongs to the technical field of burners, and particularly relates to a novel burner and a metal melting furnace structure.

Background

Because of the energy-saving requirement of the industrial furnace, the high-temperature air combustion technology of the regenerative chamber is widely applied. However, the high NOx emissions from high temperature air combustion are also important limiting factors in their popularization. In recent years, in order to reduce the NOx emission of high-temperature air combustion of a regenerator, various low-nitrogen combustion technologies, such as a method for centering a gas burner on two side regenerators adopted in an aluminum melting furnace, are developed, and obvious effects are achieved on reducing the NOx emission. Although the method has remarkable emission reduction effect, other problems are serious. Because the fuel gas and the air are mixed and combusted in the hearth, the fuel gas jet flow is far away from the air jet flow, the mixing is extremely poor, stable flame cannot be established by itself, and once the condition of flameout occurs, the fuel gas explosion is extremely easy to cause. Moreover, flame monitoring is difficult due to unstable flame combustion and unstable ignition point, and great potential safety hazards exist. Therefore, a new central gas burner technology needs to be developed, and the potential safety hazard problem caused by the ultra-low NOx emission advantage of the high-temperature air combustion of the regenerator is solved.

Disclosure of Invention

The utility model aims to solve the problems that the existing burner cannot automatically establish stable flame and easily causes the conditions of flame failure and flameout, and provides a novel burner and a metal melting furnace structure which adopt the staged mixed combustion of air and auxiliary fuel gas to form and provide a stable and reliable ignition source around a main flame combustion area.

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

the novel combustor comprises an igniter, a main gas output part and an air-fuel premixing combustion part; the tail end of the main gas output part is provided with a main gas nozzle;

the air-fuel premixed combustion part is arranged outside the main gas output part in a surrounding mode, comprises an auxiliary gas output part arranged outside the main gas output part, and a first premixed combustion part and a second premixed combustion part which are sequentially arranged along the gas conveying direction of the auxiliary gas output part, wherein the auxiliary gas output part is provided with a first auxiliary gas nozzle arranged between the first premixed combustion part and the second premixed combustion part, and a second auxiliary gas nozzle arranged between the second premixed combustion part and the main gas nozzle.

The first premixed combustion part is circumferentially provided with a plurality of first flame stabilizing air nozzles and a plurality of first main combustion air nozzles, and a first flame stabilizing air jet generated by the first flame stabilizing air nozzles is used for forming a first auxiliary flame combustion area when an igniter ignites after being mixed with a first auxiliary gas jet generated by the first auxiliary gas nozzles.

The second premixed combustion part is circumferentially provided with a plurality of second flame stabilizing air nozzles and a plurality of second main combustion air nozzles, the second flame stabilizing air nozzles are used for conveying first auxiliary flames of the first auxiliary flame combustion zone and first premixed jet flows which are not combusted, and the first premixed jet flows generated by the second flame stabilizing air nozzles are used for forming the second auxiliary flame combustion zone under the ignition action of the first auxiliary flames after being mixed with second auxiliary gas jet flows generated by the second auxiliary gas nozzles.

The second main combustion air jet is used for transmitting the main combustion air jet generated by the first main combustion air jet, and the main combustion air jet generated by the second main combustion air jet is used for forming a main flame combustion area under the ignition effect of second auxiliary flames of the second auxiliary flame combustion area after being mixed with the main fuel gas jet generated by the main fuel gas jet.

The first auxiliary gas nozzle faces the first premixed combustion part and is positioned at one side close to the first flame stabilizing air nozzle, and the second auxiliary gas nozzle faces the second premixed combustion part and is positioned at one side close to the second flame stabilizing air nozzle.

Compared with the prior art, the novel burner provided by the utility model has the advantages that the first stable flame air jet and the first auxiliary gas jet are mixed and ignited to form the first auxiliary flame combustion zone, the second premixed combustion part further conveys the first auxiliary flame and the first premixed jet which are not combusted in the first auxiliary flame combustion zone to be mixed and combusted with the second auxiliary gas jet, a plurality of flame residence points with different vector directions and speeds can be generated through the interlacing, friction and collision of a plurality of streams to form the second auxiliary flame combustion zone, a stable and reliable ignition source is formed and provided around the main flame combustion zone, the condition of flame extinction and flameout of the main flame is avoided, and the novel burner is reliable to use. The first auxiliary flame combustion zone and the second auxiliary flame combustion zone can provide reliable and stable ignition sources for the flame combustion zone, and can also provide required flame rigidity, spreadability and heat transfer performance and adjust flame shape, length and width according to the adjustment of auxiliary fuel gas conveying quantity. The auxiliary flame of the novel burner is divided into a first auxiliary flame combustion area and a second auxiliary flame combustion area for secondary area combustion, so that the super stability of auxiliary main flame combustion can be realized, various normal and abnormal operations on site can be adequately coped without flameout, flame separation, flame release, backfire and the like, and the safety of main flame operation is ensured. And the ultra-large regulation ratio is realized, the special requirements of the process on flame performance are met, and the ultra-low nitrogen emission characteristic is ensured.

Further, the first premixed combustion part and the second premixed combustion part are arranged on the outer side of the auxiliary gas output part in a surrounding mode, the first main combustion air nozzle is positioned on the outer side of the first flame stabilizing air nozzle, the normal line of the first flame stabilizing air nozzle is intersected with the normal line of the first auxiliary gas nozzle or is arranged in a staggered mode, the second main combustion air nozzle is positioned on the outer side of the second flame stabilizing air nozzle, and the normal line of the second flame stabilizing air nozzle is intersected with the normal line of the second auxiliary gas nozzle or is arranged in a staggered mode; by means of the arrangement, the generated first flame stabilizing air jet and the first auxiliary gas jet realize staggered mixed combustion, and a first auxiliary flame combustion zone which is provided with a plurality of flame stabilizing vortexes and independently and stably combusts is formed. And the generated second flame stabilizing air jet and the second auxiliary gas jet realize staggered mixed combustion to form a second auxiliary flame combustion zone which is provided with a plurality of flame stabilizing vortexes and independently and stably combusted.

Further, the first flame stabilizing air nozzle, the first main combustion air nozzle, the second flame stabilizing air nozzle and the second main combustion air nozzle are respectively arranged along the axial direction of the main combustion gas output part; through the arrangement, the air flow generated by each air nozzle has direction consistency, and the air flow is conveyed more smoothly.

Further, the first auxiliary gas nozzle is radially arranged along the axial direction of the main gas output part, and the second auxiliary gas nozzle comprises a second auxiliary gas radial nozzle and a second auxiliary gas dip nozzle which are arranged along the axial direction of the main gas output part; through the arrangement, the second auxiliary fuel gas is supplied in two ways, and air flows generated by the second flame stabilizing air nozzle and the second main fuel air nozzle are staggered, rubbed and collided through a plurality of flow strands to form a plurality of flame stabilizing standing points with different vector directions and speeds, so that a multi-point flame stabilizing condition of the main flame combustion area is formed, and the main flame stabilizing effect is good.

Further, the normal line of the second auxiliary fuel gas radial nozzle is intersected with the normal line of the second auxiliary fuel gas inclined nozzle or is arranged in a staggered manner; through the arrangement, the second auxiliary fuel gas generated by the second auxiliary fuel gas nozzle has a vortex effect, and the mixing effect of the second auxiliary fuel gas and the first premixed jet generated by the second flame stabilizing air nozzle is better.

Further, the normal line of the first flame stabilizing air nozzle, the normal line of the first main combustion air nozzle, the normal line of the second flame stabilizing air nozzle and the normal line of the second main combustion air nozzle are respectively staggered along the axial direction of the main combustion gas output part; through the arrangement, the travel of the first flame stabilizing air jet and the first main combustion air jet in the first auxiliary flame combustion area is effectively prolonged, so that the mixing time of the first flame stabilizing air jet, the first main combustion air jet and the first auxiliary combustion air jet in the first auxiliary flame combustion area is prolonged, and the mixing effect of the fuel gas and the air is better.

Further, the first auxiliary gas jet generated by the first auxiliary gas nozzle accounts for 15-50% of the gas conveying amount of the auxiliary gas output part; the second auxiliary gas jet generated by the second auxiliary gas nozzle accounts for 50-85% of the gas conveying amount of the auxiliary gas output part; through the arrangement, the second auxiliary gas jet has larger duty ratio, and the flame stabilizing effect of the second auxiliary flame combustion area is effectively improved.

Further, the aperture width of the first main combustion air nozzle is smaller than that of the second main combustion air nozzle; through the arrangement, the flow velocity of the main combustion air jet flowing through the second main combustion air nozzle is effectively slowed down, so that the mixing time of the main combustion air jet and the second auxiliary gas jet and the main gas jet is longer, and the mixing effect is more sufficient.

Further, the gas burner further comprises a gas conveying part connected to the upstream ends of the main gas output part and the air-fuel premixed combustion part and a flame tube sleeved at the downstream ends of the main gas output part and the air-fuel premixed combustion part, wherein the gas conveying part is provided with a main gas conduit, an auxiliary gas conveying channel and an air conveying channel which are positioned inside, the main gas conduit is communicated with the main gas output part, the auxiliary gas conveying channel is communicated with the auxiliary gas output part, and the air conveying channel is communicated with the first premixed combustion part and the second premixed combustion part; through the arrangement, the flame tube is arranged at the downstream end of the main gas output part and the air-fuel premixing combustion part, so that a relatively airtight space is formed among the first auxiliary flame combustion area, the second auxiliary flame combustion area and the main flame combustion area, and the flame stabilizing effect of each combustion area is good.

The utility model provides a metal smelting furnace structure, includes furnace body, first heat accumulation and gas delivery chamber, second heat accumulation and gas delivery chamber, gas circuit switching control module, air delivery pipe, fume emission pipe and novel combustor, first heat accumulation and gas delivery chamber, second heat accumulation and gas delivery chamber are connected with the furnace of furnace body respectively, novel combustor is used for providing burning transport and ignition for the furnace body, first heat accumulation and gas delivery chamber, second heat accumulation and gas delivery chamber are connected with air delivery pipe and fume emission pipe respectively for outwards discharge to the flue gas that produces after the air is carried to the furnace or after burning in the furnace, gas circuit switching control module is used for switching the air input state or the fume emission state of first heat accumulation and gas delivery chamber and second heat accumulation and gas delivery chamber. Through the arrangement, the first stable flame air jet and the first auxiliary gas jet are mixed and ignited to form a first auxiliary flame combustion area, the second premixed combustion part further conveys the first auxiliary flame and the first premixed jet which is not combusted in the first auxiliary flame combustion area to be mixed and combusted with the second auxiliary gas jet, a plurality of flame residence points with different vector directions and speeds can be generated through the interlacing, friction and collision of a plurality of streams to form a second auxiliary flame combustion area, a stable and reliable ignition source is formed and provided around the main flame combustion area, the condition of flameout and flameout of main flame is avoided, and the use is reliable.

Drawings

FIG. 1 is a schematic view of a main gas output and an air-fuel premixed combustion section

FIG. 2 is a schematic view of a novel combustor

FIG. 3 is a cross-sectional view taken at B-B in FIG. 2

FIG. 4 is a cross-sectional view taken at A-A in FIG. 2

FIG. 5 is a right side view of the novel burner of FIG. 2

FIG. 6 is a schematic view of a metal melting furnace structure

FIG. 7 is a schematic view showing the operation of the metal melting furnace (the first heat storage and gas transfer chamber is in the state of exhausting flue gas, and the second heat storage and gas transfer chamber is in the state of inputting air)

FIG. 8 is a schematic view showing the operation of the metal melting furnace (the first heat storage and gas transfer chamber is in the air input state, and the second heat storage and gas transfer chamber is in the fume exhaust state)

Detailed Description

The technical scheme of the utility model is described below with reference to the accompanying drawings:

embodiment one:

referring to fig. 1 to 5, the novel burner 100 of the present utility model includes an igniter 3, a main gas output part 1, and an air-fuel premixed combustion part 2; the tail end of the main gas output part 1 is provided with a main gas nozzle 11.

The air-fuel premixed combustion part 2 is arranged on the outer side of the main gas output part 1 in a surrounding manner, comprises an auxiliary gas output part 21 arranged on the outer side of the main gas output part 1, and a first premixed combustion part 22 and a second premixed combustion part 23 which are sequentially arranged along the gas conveying direction of the auxiliary gas output part 21, wherein the auxiliary gas output part 21 is provided with a first auxiliary gas nozzle 211 positioned between the first premixed combustion part 22 and the second premixed combustion part 23, and a second auxiliary gas nozzle 212 positioned between the second premixed combustion part 23 and the main gas nozzle 11;

the first premixed combustion part 22 is circumferentially provided with a plurality of first flame stabilizing air nozzles 221 and a plurality of first main combustion air nozzles 222, and a first flame stabilizing air jet generated by the first flame stabilizing air nozzles 221 is used for forming a first auxiliary flame combustion zone 26 when the igniter 3 ignites after being mixed with a first auxiliary gas jet generated by the first auxiliary gas nozzle 211.

The second premixed combustion part 23 is circumferentially provided with a plurality of second flame stabilizing air nozzles 231 and a plurality of second main combustion air nozzles 232, the second flame stabilizing air nozzles 231 are used for conveying first auxiliary flames of the first auxiliary flame combustion zone 26 and first premixed jet which is formed by mixing the first flame stabilizing air jet with the first auxiliary gas jet but is not combusted, and the first premixed jet generated by the second flame stabilizing air nozzles 231 is used for forming the second auxiliary flame combustion zone 25 under the ignition action of the first auxiliary flames after being mixed with the second auxiliary gas jet generated by the second auxiliary gas nozzles 212.

The second main air nozzle 232 is used for transferring the main air jet generated by the first main air nozzle 222, and the main air jet generated by the second main air nozzle 232 is used for forming the main flame combustion area 25 under the ignition action of the second auxiliary flame combustion area 25 after being mixed with the main gas jet generated by the main gas nozzle 11.

The first auxiliary gas jets 211 are directed towards the first premixed combustion part 22 and are located on the side close to the first flame holding air jets 221, and the second auxiliary gas jets 212 are directed towards the second premixed combustion part 23 and are located on the side close to the second flame holding air jets 231.

Compared with the prior art, the novel burner 100 of the utility model has the advantages that the first stable flame air jet and the first auxiliary gas jet are mixed and ignited to form the first auxiliary flame combustion zone 26, the second premixed combustion part 23 further conveys the first auxiliary flame and the first premixed jet which are not combusted in the first auxiliary flame combustion zone 26 to be mixed and combusted with the second auxiliary gas jet, a plurality of flame residence points with different vector directions and speeds can be generated through the interlacing, friction and collision of a plurality of streams to form the second auxiliary flame combustion zone 25, a stable and reliable ignition source is formed and provided around the main flame combustion zone 25, the condition of flame extinction and flameout of the main flame is avoided, and the novel burner is reliable to use. The first auxiliary flame burning zone 26 and the second auxiliary flame burning zone 25 can provide reliable and stable ignition source for the flame burning zone 25, and can also provide flame rigidity, spreadability and heat transfer performance as well as adjust flame shape, length and width according to the adjustment of auxiliary fuel gas conveying quantity. The auxiliary flame of the novel burner 100 is divided into the first auxiliary flame combustion zone 26 and the second auxiliary flame combustion zone 25, so that the super-stability of the auxiliary main flame combustion can be realized, and the auxiliary flame is sufficient to cope with various normal and abnormal operations on site without flameout, flame separation, flame release, backfire and the like, thereby guaranteeing the safety of the main flame operation. And the ultra-large regulation ratio is realized, the special requirements of the process on flame performance are met, and the ultra-low nitrogen emission characteristic is ensured.

Referring to fig. 1 to 4, in one embodiment, the first premixed combustion part 22 and the second premixed combustion part 23 are circumferentially arranged outside the auxiliary gas output part 21, the first main gas air nozzle 222 is located outside the first flame holding air nozzle 221, the normal line of the first flame holding air nozzle 221 is intersected with or staggered with the normal line of the first auxiliary gas nozzle 211, the second main gas air nozzle 232 is located outside the second flame holding air nozzle 231, and the normal line of the second flame holding air nozzle 231 is intersected with or staggered with the normal line of the second auxiliary gas nozzle 212; by this arrangement, the resulting first flame stabilizing air jet is caused to effect cross-mix combustion with the first auxiliary gas jet, forming a first auxiliary flame combustion zone 26 having multiple flame stabilizing vortices and independently stabilizing combustion. And the generated second flame stabilizing air jet and the second auxiliary gas jet realize staggered mixed combustion to form a second auxiliary flame combustion zone 25 with a plurality of flame stabilizing vortex and independent stable combustion.

In one embodiment, the first flame holding air nozzle 221, the first main combustion air nozzle 222, the second flame holding air nozzle 231, and the second main combustion air nozzle 232 are respectively arranged along the axial direction of the main gas output section 1; through the arrangement, the air flow generated by each air nozzle has direction consistency, and the air flow is conveyed more smoothly.

Referring to fig. 1-5, in one embodiment, the first premixed combustion part 22 and the second premixed combustion part 23 are arranged at opposite intervals, and the first flame stabilizing air nozzle 221, the first main combustion air nozzle 222, the second flame stabilizing air nozzle 231 and the second main combustion air nozzle 232 are communicated with each other; by means of the arrangement, the primary combustion air jet flowing into the second auxiliary flame combustion zone 25 from the first auxiliary flame combustion zone 26 is not pure air, but is mixed with the first premixed jet, the first auxiliary flame and the complex flow field of the first auxiliary fuel gas jet entering into the second auxiliary flame combustion zone 25, so that ultra-strong stable flame is generated, and the technical basis of the flame stabilizing effect of the novel combustor 100 is formed.

Referring to fig. 1 to 4, in one embodiment, the first auxiliary gas nozzle 211 is radially arranged along the axial direction of the main gas output 1, the second auxiliary gas nozzle 212 includes a second auxiliary gas radial nozzle 2121 and a second auxiliary gas dip nozzle 2122 arranged along the axial direction of the main gas output 1, and the second auxiliary gas dip nozzle 2122 forms an acute angle a ° with the axial direction of the main gas output 1; through the arrangement, the second auxiliary fuel gas is supplied in two ways, and air flows generated by the second flame stabilizing air nozzles 231 and the second main fuel air nozzles 232 are staggered, rubbed and collided through a plurality of flows to form a plurality of flame stabilizing standing points with different vector directions and speeds, so that the multi-point flame stabilizing condition of the main flame combustion area 25 is formed, and the main flame stabilizing effect is good.

In one embodiment, the normal lines of the second auxiliary fuel gas radial nozzles 2121 intersect with or are staggered with the normal lines of the second auxiliary fuel gas inclined nozzles 2122, the second auxiliary fuel gas radial nozzles 2121 are arranged on one side of the second auxiliary fuel gas inclined nozzles 2122, which is located at the downstream side of the main fuel gas air jet in the vertical direction, and an included angle between the second auxiliary fuel gas radial nozzles 2121 and the second auxiliary fuel gas inclined nozzles 2122 is an acute angle; by this arrangement, the second auxiliary fuel gas generated by the second auxiliary fuel gas nozzle 212 has a swirling effect, and the mixing effect with the first premixed jet generated by the second flame stabilizing air nozzle 231 is better.

Referring to fig. 1, in one embodiment, the normal line of the first flame holding air nozzle 221, the normal line of the first main combustion air nozzle 222, the normal line of the second flame holding air nozzle 231, and the normal line of the second main combustion air nozzle 232 are respectively staggered from each other along the axial direction of the main combustion gas output section 1; by the arrangement, the travel of the first flame stabilizing air jet and the first main fuel air jet in the first auxiliary flame combustion zone 26 is effectively prolonged, so that the mixing time of the first flame stabilizing air jet, the first main fuel air jet and the first auxiliary fuel air jet in the first auxiliary flame combustion zone 26 is prolonged, and the mixing effect of fuel gas and air is better.

Referring to fig. 1 to 4, in one embodiment, the first auxiliary gas jet generated by the first auxiliary gas nozzle 211 accounts for 15-50% of the gas delivery of the auxiliary gas output 21; the second auxiliary gas jet generated by the second auxiliary gas nozzle 212 accounts for 50-85% of the gas delivery amount of the auxiliary gas output part 21; by this arrangement, the second auxiliary gas jet has a larger duty cycle, effectively improving the flame stabilizing effect of the second auxiliary flame combustion zone 25.

Referring to FIG. 1, in one embodiment, the aperture width of the first main air jets 222 is less than the aperture width of the second main air jets 232; through such arrangement, the flow velocity of the main combustion air jet flowing through the second main combustion air nozzle 232 is effectively slowed down, so that the mixing time of the main combustion air jet and the second auxiliary gas jet and the main gas jet is longer, and the mixing effect is more sufficient.

Referring to fig. 1 to 5, in one embodiment, the air-fuel gas burner further comprises a gas delivery part 26 connected to the upstream ends of the main gas output part 1 and the air-fuel premixed combustion part 2 and a flame tube 27 sleeved on the downstream ends of the main gas output part 1 and the air-fuel premixed combustion part 2, the gas delivery part 26 is provided with a main gas conduit 261, an auxiliary gas delivery channel 262 and an air delivery channel 263 which are positioned inside, the main gas conduit 261 is communicated with the main gas output part 1, a main gas input port 264 is arranged on the upstream of the main gas conduit 261, the auxiliary gas delivery channel 262 is communicated with the auxiliary gas output part 21, an auxiliary gas input port 265 is arranged on the upstream of the auxiliary gas delivery channel 262, the air delivery channel 263 is communicated with the first premixed combustion part 22 and the second premixed combustion part 23, and an air input port 266 is arranged on the upstream of the air delivery channel 263; by the arrangement, the flame tube 27 is arranged at the downstream ends of the main gas output part 1 and the air-fuel premixing combustion part 2, so that the first auxiliary flame combustion area 26, the second auxiliary flame combustion area 25 and the main flame combustion area 25 form a relatively airtight space, and the flame stabilizing effect of each combustion area is good.

In one embodiment, the auxiliary fuel gas accounts for 3-20% of the total fuel gas delivery, so that the generated auxiliary flame has good stability, wide operating range, good flame monitoring performance and large regulation ratio. The main fuel gas accounts for 80% of the total fuel gas delivery.

Referring to fig. 1-4, in one embodiment, the igniter 3 is disposed between the first and second premixed combustion parts 22 and 23 and communicates with the first and second auxiliary flame combustion zones 26 and 24 for igniting an air-fuel premixed gas formed between the first and second premixed combustion parts 22 and 23.

In one embodiment, an auxiliary flame monitor 4 for detecting the first auxiliary flame and the second auxiliary flame is also included.

The novel combustor 100 has an independent combustion control and monitoring system. When the total power of the novel burner 100 is less than 500kw, the igniter 3 may be an electric spark igniter 3, and when the total power of the novel burner 100 is greater than 500kw, the igniter 3 may be a burner nozzle.

The novel burner 100 of the present utility model, in operation, comprises the following start-up sequences: starting the igniter 3, after the igniter 3 is monitored to establish stable and reliable ignition flame, starting auxiliary flame by introducing auxiliary fuel gas, and starting main flame by introducing main fuel gas after the auxiliary flame signal is stably detected by a flame monitor special for the auxiliary flame. And then, adjusting parameters of auxiliary flame and main flame to reach flame characteristics required by the process, and entering a normal working state.

Embodiment two:

referring to fig. 6 to 8, a main object of the present embodiment is to provide a metal furnace structure 5 using the novel burner 100 of the first embodiment, which includes a furnace body 51, a first heat storage and gas transfer chamber 52, a second heat storage and gas transfer chamber 53, a gas path switching control module (not shown), an air transfer pipe 54, a flue gas exhaust pipe 55, and the novel burner 100, wherein the novel burner 100, the first heat storage and gas transfer chamber 52, the second heat storage and gas transfer chamber 53 are respectively connected with a furnace chamber of the furnace body 51, the novel burner 100 is used for providing a combustion transfer and ignition function for the furnace body 51, the first heat storage and gas transfer chamber 52, the second heat storage and gas transfer chamber 53 are respectively connected with an air transfer pipe 54 and a flue gas exhaust pipe 55, for externally exhausting flue gas generated after transferring air to the furnace chamber or burning in the furnace chamber, and the gas path switching control module is used for switching an air input state or a flue gas exhaust state of the first heat storage and gas transfer chamber 52 and the second heat storage and gas transfer chamber 53.

When the first heat storage and gas delivery chamber 52 and the second heat storage and gas delivery chamber 53 are used in the fume exhaust state, the self body can be heated by absorbing the heat of the high-temperature fume, and the input cold air is heated to the high-temperature combustion air and then discharged into the furnace body 51 when the air input state is switched to the subsequent state, so that the heating work efficiency of the metal melting furnace structure 5 is improved.

Referring to fig. 6 to 8, when the metal furnace structure 5 is used, the following working process is included, after the novel low-nitrogen burner is started, cold air is supplied to the first heat storage and gas delivery chamber 52, the cold air is heated by the first heat storage and gas delivery chamber 52, and then is changed into high-temperature combustion air, the high-temperature combustion air is sprayed into the furnace chamber, and is mixed and combusted with the rich gas flame sprayed by the novel low-nitrogen burner, after heat is transferred to the heated material, the smoke is generated and sucked into the second heat storage and gas delivery chamber 53, most of the heat of the high-temperature smoke is used for heating the body of the second heat storage and gas delivery chamber 53, when the temperature of the first heat storage and gas delivery chamber 52 is reduced to the insufficient heat storage, the use states of the first heat storage and gas delivery chamber 52 and the second heat storage and gas delivery chamber 53 are mutually switched, the first heat storage and gas delivery chamber 52 supplies hot air, and the first heat storage and gas delivery chamber 52 sucks the smoke into the heat storage state.

Compared with the prior art, in the metal melting furnace structure 5, after the first flame stabilizing air jet and the first auxiliary gas jet are mixed and ignited, a first auxiliary flame combustion area 26 is formed, the second premixed combustion part 23 further conveys the first auxiliary flame and the first premixed jet which are not combusted in the first auxiliary flame combustion area 26 to be mixed and combusted with the second auxiliary gas jet, a plurality of flame residence points with different vector directions and speeds can be generated through the interlacing, friction and collision of a plurality of streams, a second auxiliary flame combustion area 25 is formed, a stable and reliable ignition source is formed and provided around the main flame combustion area 25, the condition of flame extinction and flameout of the main flame is avoided, and the metal melting furnace structure is reliable to use.

Variations and modifications to the above would be obvious to persons skilled in the art to which the utility model pertains from the foregoing description and teachings. Therefore, the utility model is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the utility model should be also included in the scope of the claims of the utility model. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present utility model in any way.

Claims (10)

1. Novel combustor, its characterized in that includes:

an igniter;

the tail end of the main fuel gas output part is provided with a main fuel gas nozzle;

the air-fuel premixed combustion part is circumferentially arranged outside the main gas output part and comprises an auxiliary gas output part arranged outside the main gas output part, a first premixed combustion part and a second premixed combustion part which are sequentially arranged along the gas conveying direction of the auxiliary gas output part, wherein the auxiliary gas output part is provided with a first auxiliary gas nozzle arranged between the first premixed combustion part and the second premixed combustion part and a second auxiliary gas nozzle arranged between the second premixed combustion part and the main gas nozzle;

the first premixed combustion part is circumferentially provided with a plurality of first flame stabilizing air nozzles and a plurality of first main combustion air nozzles; the second premixed combustion part is circumferentially provided with a plurality of second flame stabilizing air nozzles and a plurality of second main combustion air nozzles;

the first auxiliary gas nozzle faces the first premixed combustion part and is positioned at one side close to the first flame stabilizing air nozzle, and the second auxiliary gas nozzle faces the second premixed combustion part and is positioned at one side close to the second flame stabilizing air nozzle.

2. The novel burner of claim 1, wherein the first and second premixed combustion portions are circumferentially disposed outside the auxiliary gas output, the first main flame air nozzle is disposed outside the first flame stabilizing air nozzle, a normal line of the first flame stabilizing air nozzle intersects or is staggered with a normal line of the first auxiliary gas nozzle, the second main flame air nozzle is disposed outside the second flame stabilizing air nozzle, and a normal line of the second flame stabilizing air nozzle intersects or is staggered with a normal line of the second auxiliary gas nozzle.

3. The novel burner of claim 2, wherein the first flame holding air nozzle, the first main combustion air nozzle, the second flame holding air nozzle, and the second main combustion air nozzle are disposed in an axial direction of the main gas output, respectively;

the first premixed combustion part and the second premixed combustion part are arranged at opposite intervals, and the first flame stabilizing air nozzle, the first main combustion air nozzle, the second flame stabilizing air nozzle and the second main combustion air nozzle are mutually communicated.

4. A new burner as claimed in claim 3, wherein the first auxiliary gas jets are radially arranged in the axial direction of the main gas output and the second auxiliary gas jets comprise second auxiliary gas radial jets and second auxiliary gas tilt angle jets arranged in the axial direction of the main gas output.

5. The burner of claim 4, wherein the normal of the second auxiliary gas radial jets intersect or are staggered with the normal of the second auxiliary gas tilt jets.

6. A new burner as claimed in claim 3, characterized in that the normals of the first flame holding air jets, the normals of the first main combustion air jets, the normals of the second flame holding air jets and the normals of the second main combustion air jets are respectively staggered from each other in the axial direction of the main combustion gas output.

7. The novel burner of claim 1, wherein the first auxiliary gas jet produced by the first auxiliary gas jet accounts for 15-50% of the gas delivery of the auxiliary gas output; the second auxiliary gas jet generated by the second auxiliary gas nozzle accounts for 50-85% of the gas conveying amount of the auxiliary gas output part.

8. The novel burner of claim 3 or 6, wherein the aperture width of the first primary air ports is less than the aperture width of the second primary air ports.

9. The novel burner of any one of claims 1 to 7, further comprising a gas delivery portion connected to the upstream ends of the main gas output portion and the air-fuel premixed combustion portion, and a flame tube sleeved on the downstream ends of the main gas output portion and the air-fuel premixed combustion portion, wherein the gas delivery portion is provided with a main gas conduit, an auxiliary gas delivery passage and an air delivery passage which are positioned inside, the main gas conduit is communicated with the main gas output portion, the auxiliary gas delivery passage is communicated with the auxiliary gas output portion, and the air delivery passage is communicated with the first premixed combustion portion and the second premixed combustion portion.

10. The metal melting furnace structure is characterized by comprising a furnace body, a first heat storage and gas conveying chamber, a second heat storage and gas conveying chamber, a gas circuit switching control module, an air conveying pipe and a smoke exhaust pipe, and the novel burner according to any one of claims 1 to 9, wherein the novel burner, the first heat storage and gas conveying chamber and the second heat storage and gas conveying chamber are respectively connected with a hearth of the furnace body, the novel burner is used for providing combustion conveying and ignition effects for the furnace body, the first heat storage and gas conveying chamber and the second heat storage and gas conveying chamber are respectively connected with the air conveying pipe and the smoke exhaust pipe, the gas circuit switching control module is used for switching an air input state or a smoke exhaust state of the first heat storage and gas conveying chamber and the second heat storage and gas conveying chamber after air is conveyed to the hearth or smoke generated after combustion in the hearth is exhausted outwards.