I-type self-preheating burner with special-shaped tubular ceramic stud double-stroke heat exchanger

Abstract

The present invention discloses an I-type self-preheating burner with a special-shaped tubular ceramic stud double-stroke heat exchanger, comprising a burner core, a special-shaped tubular box heat exchanger, an inner conduit, and a fully ceramic optimized stud heat exchanger. The upper end of the fully ceramic optimized stud heat exchanger is sleeved within the special-shaped tubular box heat exchanger, the lower end of the fully ceramic optimized stud heat exchanger extends outside the special-shaped tubular box heat exchanger, the upper end of the inner conduit is connected to the upper end of the special-shaped tubular box heat exchanger, the lower end of the inner conduit extends into the inner cavity of the fully ceramic optimized stud heat exchanger, the burner core is sleeved within the inner conduit, and the upper and lower ends of the burner core extend from the upper and lower ends of the inner conduit, respectively. The present invention can form a stable and uniform flame under high blast furnace temperatures, produce ultra-low NOx smoke exhaust, improve heat exchange efficiency, and play a role in reducing emissions and energy consumption. The burner adopts a modular design, and the system is very easy to maintain and modify.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to an I-type self-preheating burner with a special-shaped tubular ceramic stud double-stroke heat exchanger. Background Art

[0002] The Type I self-preheating burner is a radiant tube burner used for indirect heating of heat treatment equipment and an open flame burner for direct heating of heat treatment furnaces or other thermal processes. It utilizes flue gas waste heat to preheat the combustion air. The heat exchanger is available in various configurations, with a double-walled shell and internal liner for insulation, minimizing heat loss. It offers high efficiency and energy savings.

[0003] The I-type self-preheating burner commonly used in the market is a sub-high-speed burner, which is relatively mature in development. The heat exchanger is diverse in form, including all-metal light tube heat exchangers, inner and outer double-fin heat exchangers cast in heat-resistant steel (to increase the heat exchange area), and all-ceramic optimized stud shape heat exchangers. Different standard lengths have been formed, covering eight sizes and capacities ranging from 5 to 500kW.

[0004] With the continuous improvement of ultra-low NOx emission standards and the reduction of energy consumption under the dual-carbon background, the burner can no longer meet the NOx emission standards. The thermal efficiency level still has great potential, and there is still much room for improvement in saving energy and improving energy utilization efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that, in response to the above-mentioned defects of the prior art, an I-type self-preheating burner with a special-shaped tubular ceramic stud double-stroke heat exchanger is provided, which can form a stable and uniform flame under high temperature of the blast furnace, form ultra-low NOx smoke exhaust, improve heat exchange efficiency, and play a role in reducing emissions and consumption; the burner adopts a modular design as a whole, and the maintenance and modification of the system is very simple.

[0006] The technical solution adopted by the present invention to solve the above technical problems is:

[0007] A type I self-preheating burner with a special-shaped tubular ceramic stud double-stroke heat exchanger includes a burner core, a special-shaped tubular box heat exchanger, an inner guide tube and a fully ceramic optimized stud heat exchanger. The upper end of the fully ceramic optimized stud heat exchanger is sleeved in the special-shaped tubular box heat exchanger, and the lower end of the fully ceramic optimized stud heat exchanger extends out of the special-shaped tubular box heat exchanger. The upper end of the inner guide tube is connected to the upper end of the special-shaped tubular box heat exchanger, and the lower end of the inner guide tube extends into the inner cavity of the fully ceramic optimized stud heat exchanger. The burner core is sleeved in the inner guide tube, and the upper and lower ends of the burner core extend from the upper and lower ends of the inner guide tube respectively.

[0008] According to the above technical solution, the burner core includes a gas sealing channel, a combustion chamber, a central gas pipe and a burner ignition and flame detection system. The combustion chamber is arranged at the bottom of the gas sealing channel, and the burner ignition and flame detection system is arranged on one side of the gas sealing channel. The lower end of the burner ignition and flame detection system extends into the combustion chamber, and the lower end of the central gas pipe extends into the combustion chamber.

[0009] According to the above technical solution, the gas sealing channel includes a gas interface, a gas pipe, a gas nozzle and a gas shell. The gas shell is provided with a gas interface. The upper end of the gas pipe is connected to the gas shell and communicates with the inner cavity of the gas shell. The gas nozzle is arranged at the lower end of the gas pipe and connected to the combustion chamber. The central gas pipe is sleeved in the gas pipe. The upper end of the central gas pipe passes through the gas pipe and the gas shell, and the lower end of the central gas pipe passes through the gas pipe and the gas nozzle to the combustion chamber.

[0010] According to the above technical solution, the burner ignition and flame detection system includes an electrode assembly, the upper end of the electrode assembly is connected to the gas shell, the middle part of the electrode assembly is provided with an electrode conduit, the electrode conduit is connected and fixed to the gas pipe through an electrode conduit bracket, and the lower end of the electrode assembly extends into the combustion chamber.

[0011] According to the above technical solution, the special-shaped tube box heat exchanger includes an inner sleeve, an outer sleeve, a flue gas outlet pipe and an air inlet pipe. The inner sleeve is sleeved in the outer sleeve, and an air cavity is left between the upper end of the inner sleeve and the upper end of the outer sleeve. An interlayer is provided on the inner wall of the outer sleeve as a combustion air inlet cavity. The air inlet pipe is provided on the outer sleeve and communicated with the interlayer of the outer sleeve. A plurality of special-shaped tubes are distributed between the inner sleeve and the outer sleeve. A flange 2 is provided laterally in the inner cavity of the outer sleeve. The flange 2 is provided with a Placed at the upper end of the inner sleeve, an air and flue gas heat exchange cavity is formed between flange 2, the inner sleeve, the outer sleeve and the outer wall of the special-shaped tube. Flange 2 separates the air and flue gas heat exchange cavity from the air cavity. An annular gap cavity is provided at the lower end of the outer sleeve. The lower end of the inner cavity of the special-shaped tube is connected with the interlayer of the outer sleeve through the annular gap cavity. The upper end of the inner cavity of the special-shaped tube passes through flange 2 and is connected with the air cavity. A flow hole is opened on the inner wall of the inner sleeve to connect the inner cavity of the inner sleeve with the air and flue gas heat exchange cavity.

[0012] According to the above technical solution, the special-shaped tubes include horizontal flat tubes and vertical flat tubes that are interconnected and alternately arranged along the same straight line.

[0013] According to the above technical solution, the outer sleeve includes shell one and shell two, shell two is arranged in shell one, and the inner sleeve includes shell three and shell four, shell three and shell four are arranged in shell two at intervals along the same axis, and shell one, shell two, shell three and shell four are all cylindrical.

[0014] According to the above technical solution, the inner conduit includes a connecting pipe flange, a bushing, a bushing support plate and a seamless pipe. The connecting pipe flange is arranged at the upper end of the seamless pipe. The connecting pipe flange, the bushing and the bushing support plate are arranged on the seamless pipe in sequence. A through hole is provided on the side wall of the seamless pipe. The through hole is located within the height range of the preheating air cavity. The inner conduit is sealed and connected to the special-shaped tubular box heat exchanger and the burner core respectively through the connecting pipe flange. The bushing is arranged at the top of the preheating air cavity.

[0015] According to the above technical solution, the inner conduit has a T-shaped structure, the outer diameter of the connecting pipe flange is larger than the outer diameter of the bushing, the outer diameter of the bushing support plate and the inner diameter of the outer sleeve, and the connecting pipe flange cover is arranged at the upper end of the special-shaped tubular box heat exchanger.

[0016] According to the above technical solution, the all-ceramic optimized stud heat exchanger is SiSiC one-piece molding with an uneven surface design; it increases the heat exchange area, improves the heat exchange efficiency, and extends the service life.

[0017] The fully ceramic optimized stud heat exchanger is a cylinder with an open top and an outlet at the bottom. The tube wall at the lower end of the cylinder is threaded or corrugated.

[0018] The present invention has the following beneficial effects:

[0019] It can form a stable and uniform flame under the high temperature of the blast furnace, while retaining the inherent advantages of the I-type preheating burner itself: creatively adding a special-shaped tubular box heat exchanger, creatively adding a full-ceramic optimized stud heat exchange, so that the preheated combustion air can further preheat the combustion air. Because this section of combustion air already has a certain temperature, the burner core secondary gas channel is creatively added to reduce the local high temperature of the flame, thereby reducing the generation of thermal NOx, forming ultra-low NOx exhaust, improving heat exchange efficiency, and playing a role in reducing emissions and consumption; the burner adopts a modular design as a whole, and the maintenance and modification of the system is very simple. This type of burner has a large power adjustment range, and burners of different specifications can achieve heating capacities ranging from 5 to 500kw, which can be widely used in metallurgical quenching, annealing and heat treatment fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 1 is a schematic structural diagram of an I-type self-preheating burner with a special-shaped tubular ceramic stud double-stroke heat exchanger according to an embodiment of the present invention;

[0021] Figure 2 2. It is a structural schematic diagram of a special-shaped tubular box heat exchanger according to an embodiment of the present invention;

[0022] Figure 3 Schematic diagram of the structure of the burner core in the embodiment of the present invention;

[0023] Figure 4 is a schematic structural diagram of an inner catheter in an embodiment of the present invention;

[0024] Figure 5 2 is a schematic structural diagram of an all-ceramic optimized stud heat exchanger according to an embodiment of the present invention;

[0025] In the figure, 1-burner core, 2-special-shaped tubular box heat exchanger, 3-inner guide tube, 4-full ceramic optimized stud heat exchanger. DETAILED DESCRIPTION

[0026] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0027] Reference Figures 1 to 5 As shown, an I-type self-preheating burner with a special-shaped tubular ceramic stud double-stroke heat exchanger in an embodiment of the present invention includes a burner core 1, a special-shaped tubular box heat exchanger 2, an inner tube 3 and a full-ceramic optimized stud heat exchanger 4. The upper end of the full-ceramic optimized stud heat exchanger 4 is sleeved in the special-shaped tubular box heat exchanger 2, and the lower end of the full-ceramic optimized stud heat exchanger 4 extends out of the special-shaped tubular box heat exchanger 2. The upper end of the inner tube 3 is connected to the special-shaped tubular box. The upper end of the inner tube heat exchanger 2 is connected, the lower end of the inner tube 3 extends into the inner cavity of the all-ceramic optimized stud heat exchanger 4, the burner core 1 is sleeved in the inner tube 3, and the upper and lower ends of the burner core 1 extend from the upper and lower ends of the inner tube 3 respectively; the lower end of the burner core 1 extends to the lower port of the all-ceramic optimized stud heat exchanger 4, the special-shaped tubular box heat exchanger 2 is connected to the exhaust end of the radiant tube through a flange, and the all-ceramic optimized stud heat exchanger 4 extends into the exhaust end of the radiant tube.

[0028] Furthermore, the burner core 1 includes a gas sealing channel, a combustion chamber 1.8, a central gas pipe 1.10, and a burner ignition and flame detection system. The combustion chamber 1.8 is arranged at the bottom of the gas sealing channel, and the burner ignition and flame detection system is arranged on one side of the gas sealing channel. The lower end of the burner ignition and flame detection system extends into the combustion chamber 1.8. The lower end of the central gas pipe 1.10 passes through the gas sealing channel and extends into the combustion chamber 1.8.

[0029] Furthermore, the gas sealing channel includes a gas interface 1.1, a gas pipe 1.3, a gas nozzle 1.6 and a gas shell. The gas shell is provided with a gas interface 1.1, which is used to connect to an external smoke exhaust pipe. The upper end of the gas pipe 1.3 is connected to the gas shell through a locking device 1.2 and communicates with the inner cavity of the gas shell. The gas nozzle 1.6 is arranged at the lower end of the gas pipe 1.3 and connected to the combustion chamber 1.8. The central gas pipe 1.10 is sleeved in the gas pipe 1.3. The upper end of the central gas pipe 1.10 passes through the gas pipe 1.3 and the gas shell, and the lower end of the central gas pipe 1.10 passes through the gas pipe 1.3 and the gas nozzle 1.6 to enter the combustion chamber 1.8.

[0030] Furthermore, the burner ignition and flame detection system includes an electrode assembly 1.9, the upper end of the electrode assembly 1.9 is connected to the gas shell, the middle part of the electrode assembly 1.9 is provided with an electrode conduit 1.4, the electrode conduit 1.4 is connected and fixed to the gas pipe 1.3 through an electrode conduit bracket 1.5, and the lower end of the electrode assembly 1.9 extends into the combustion chamber 1.8.

[0031] Furthermore, the gas shell is connected to the inner conduit 3; the combustion chamber 1.8 is a mixed gas combustion cavity, which is fixed to the gas sealing channel by fixing nails 1.7; the central gas pipe 1.10 is fixed to the gas shell by a locking device; the electrode assembly 1.9 is a burner ignition and flame detection system, which is fixed by the electrode conduit 1.4 and the electrode conduit bracket 1.5; the gas shell and the connecting pipe flange 3.1 at the upper end of the inner conduit 3 are connected by bolts.

[0032] Furthermore, the special-shaped tube box heat exchanger 2 includes an inner sleeve, an outer sleeve, a flue gas outlet pipe 2.4 and an air inlet pipe 2.5. The inner sleeve is arranged in the outer sleeve, and an air cavity is left between the upper end of the inner sleeve and the upper end of the outer sleeve, forming a preheating air cavity with the upper end flange of the burner core. An annular interlayer is provided on the inner wall of the outer sleeve, which serves as the combustion air inlet cavity. The air inlet pipe 2.5 is provided on the outer sleeve and communicated with the interlayer of the outer sleeve. A plurality of special-shaped tubes are vertically distributed between the inner sleeve and the outer sleeve. A flange 2.10 is provided laterally in the inner cavity of the outer sleeve. The flange 2.10 is provided at the upper end of the inner sleeve. An air and flue gas heat exchange cavity is formed between flange 2, the inner sleeve, the outer sleeve and the outer wall of the special-shaped tube. Flange 2 separates the air and flue gas heat exchange cavity from the air cavity. An annular gap cavity is provided at the lower end of the outer sleeve. The lower end of the inner cavity of the special-shaped tube is connected with the interlayer of the outer sleeve through the annular gap cavity. The upper end of the inner cavity of the special-shaped tube passes through flange 2 and is connected with the air cavity. A flow hole is provided on the inner wall of the inner sleeve to connect the inner cavity of the inner sleeve with the air and flue gas heat exchange cavity; the upper end of the outer sleeve is connected with the inner guide tube 3 through flange 1.1, and the upper end of the inner sleeve is connected with the upper end of the all-ceramic optimized stud heat exchanger 4 through a flange.

[0033] Furthermore, the special-shaped tubes 2.7 include transverse flat tubes and vertical flat tubes that are alternately arranged along a straight line and communicate with each other.

[0034] Furthermore, the outer sleeve includes shell one 2.2 and shell two 2.6, which are sleeved in shell one 2.2. The inner sleeve includes shell three 2.8 and shell four 2.3, which are sleeved in shell two 2.6 at intervals along the same axis. The interval space between shell three 2.8 and shell four 2.3 serves as a flow hole. Shell one 2.2, shell two 2.6, shell three 2.8 and shell four 2.3 are all cylindrical.

[0035] Furthermore, the special-shaped tube box heat exchanger 2 is composed of flange 1 2.1, shell 1 2.2, flue gas outlet pipe 2.4, air inlet pipe 2.5, shell 2 2.6, special-shaped pipe 2.7, shell 3 2.8, mounting flange 2.9, shell 4 2.3, etc. The special-shaped tube box heat exchanger 2 presents a cylindrical structure. Flange 1 2.1 is connected to the inner conduit 3. The mounting flange 2.9 is the installation dimension for connecting the entire burner with the external interface. The air inlet pipe 2.5, shell 1 2.2, shell The second shell 2.6 is sealed and welded to form a combustion air inlet cavity. The air inlet pipe 2.5 is connected to the external air duct. The second shell 2.6, the special-shaped pipe 2.7, the third shell 2.8, the fourth shell 2.3, and the seal welding form an air and flue gas heat exchange cavity. The interior of the shell formed by the third shell 2.8 and the fourth shell 2.3 is the flue gas inlet channel. The flue gas outlet pipe 2.4 forms the flue gas outlet channel. The flue gas outlet pipe 2.4 is connected to the external flue gas channel. The primary preheated air enters the burner core 1 through the seamless pipe 3.4.

[0036] Furthermore, the inner conduit 3 includes a connecting pipe flange 3.1, a bushing 3.2, a bushing support plate 3.3 and a seamless pipe 3.4. The connecting pipe flange 3.1 is arranged at the upper end of the seamless pipe 3.4. The connecting pipe flange 3.1, the bushing 3.2 and the bushing support plate 3.3 are arranged on the seamless pipe 3.4 in sequence. A through hole is provided on the side wall of the seamless pipe 3.4. The through hole is located within the range of the preheated air cavity and is connected to the air cavity. The through hole is located between the upper end of the inner sleeve and the upper end of the outer sleeve; the connecting pipe flange 3.1, the bushing 3.2 and the bushing support plate 3.3 are arranged closely in sequence, and the inner conduit 3 is connected by Pipe flange 3.1 is sealedly connected to the special-shaped tubular box heat exchanger 2 and the burner core 1, respectively. The connecting pipe flange 3.1 is bolted to flange 1 2.1. The gas shell is connected to the connecting pipe flange 3.1. A bushing 3.2 is arranged at the top of the preheated air cavity and is sleeved on the inner cavity of the outer sleeve. The all-ceramic optimized stud heat exchanger 4 is sleeved on the inner ring of the inner sleeve. The lower end of the seamless pipe 3.4 extends into the deepest part of the inner cavity of the all-ceramic optimized stud heat exchanger 4. The bushing 3.2 and flange 2.10 form the preheated air cavity. The preheated air enters the burner core through the seamless pipe 3.4, forming primary and secondary air channels.

[0037] Furthermore, the inner conduit 3 has a T-shaped structure, the outer diameter of the connecting pipe flange 3.1 is larger than the outer diameter of the bushing 3.2, the outer diameter of the bushing support plate 3.3 and the inner diameter of the outer sleeve, and the connecting pipe flange 3.1 cover is arranged at the upper end of the special-shaped tubular box heat exchanger 2.

[0038] Furthermore, the all-ceramic optimized stud heat exchanger 4 is SiSiC integrally formed with an uneven surface design; the heat exchange area is increased, the heat exchange efficiency is improved, and the service life is extended.

[0039] The all-ceramic optimized stud heat exchanger 4 is a cylinder with an open top and an outlet at the bottom. The tube wall at the lower end of the cylinder is threaded or corrugated.

[0040] Working principle of the present invention: see Figures 1 to 5 According to the present invention, a type I self-preheating burner with a special-shaped tubular ceramic stud double-stroke heat exchanger is implemented, which mainly includes a burner core 1, a special-shaped tubular box heat exchanger 2, an inner guide tube 3, and a full-ceramic optimized stud heat exchanger 4.

[0041] The special-shaped tube box heat exchanger consists of flange 1, shell 1, flue gas outlet pipe, air inlet pipe, shell 2, special-shaped tube, shell 3, mounting flange, shell 4, etc. The special-shaped tube box heat exchanger has a cylindrical structure. Flange 1 is connected to the inner conduit. The mounting flange is the installation dimension for connecting the entire burner with the external interface. The air inlet pipe, shell 1 and shell 2 are sealed and welded to form the combustion air inlet cavity. The air inlet pipe is connected to the external air duct. Shell 2, special-shaped tube, shell 3, shell 4 and seal welding form the air and flue gas heat exchange cavity. The interior of the shell composed of shell 3 and shell 4 is the flue gas inlet channel. The flue gas outlet pipe assembly The flue gas outlet channel is connected to the external flue gas channel. The initial preheated air enters the burner core through the seamless tube, forming a preheated air cavity with the bushing. In the special-shaped tube box heat exchanger, normal temperature combustion air passes through the air inlet pipe and the combustion air intake cavity into the air and flue gas heat exchange cavity, evenly distributing the combustion air into each special-shaped tube. The special-shaped tube is processed and extruded from 0Cr25Ni20 seamless tube. The interior of the steel tube changes from a round shape to a flat shape, increasing the contact area of ​​the combustion air and reducing the preheating temperature gradient of the combustion air. The overall structure of the heat exchanger, except for shell one, reserves expansion to avoid cracking caused by temperature differences. The heat exchanger is designed with a flue gas diversion channel formed by the interior of shell three and shell four and the exterior of the all-ceramic optimized stud heat exchanger. This allows the high-temperature flue gas to contact the special-shaped tube as much as possible, forming strong convection and enhancing the heat exchange efficiency of the heat exchanger.

[0042] The fully ceramic optimized stud heat exchanger is integrally formed from SiSiC and can withstand long-term use at 1180°C without oxidation. It has a continuous operating temperature of 1250°C and a maximum temperature of 1350°C. The fully ceramic optimized stud heat exchanger, seamless tube, and radiant tube form a double-layer annular seam structure. Combustion air enters the heat exchanger through the seamless tube and fully contacts the interior of the fully ceramic optimized stud heat exchanger, ensuring sufficient heat exchange. Flue gas contacts the exterior of the fully ceramic optimized stud heat exchanger, ensuring sufficient heat exchange and improving energy utilization. The uneven surface design increases the heat exchange area, improves heat exchange efficiency, and extends service life.

[0043] The inner duct is composed of a connecting pipe flange, a bushing, a bushing support plate, a seamless pipe, etc. The inner duct has a T-shaped structure and is sealed with the special-shaped tubular box heat exchanger through the connecting pipe flange, and is sealed with the burner core through the connecting pipe flange. The seamless pipe penetrates into the deepest part of the inner cavity of the all-ceramic optimized stud heat exchanger to form primary air and secondary air channels. The initially preheated air enters the seamless pipe and is preheated for the second time through the all-ceramic optimized stud heat exchanger, and participates in mixed combustion in the combustion chamber of the burner core. The seamless pipe is made of 0Cr25Ni20. The bushing also isolates heat to prevent the burner core gas shell from overheating and improve the service life of the gas shell.

[0044] The burner core integrates the gas sealing channel, mixed gas combustion chamber, burner ignition and flame detection system, etc. The gas interface is connected to the external smoke exhaust pipe, and the gas shell is connected to the capillary heat exchanger.

[0045] The present invention involves the following: a Type I self-preheating burner with a shaped tubular ceramic stud double-stroke heat exchanger is secured to the heating equipment via the mounting flange of the shaped tubular box heat exchanger. A pressure tap is installed in the burner core gas line to measure pressure and guide the adjustment of the air and gas flow rate and ratio to achieve a relatively ideal combustion effect. Before igniting the burner, the valve in the ignition burner air line is adjusted to the appropriate position. When the controller receives the ignition command, it controls the high-voltage coil to discharge, igniting the ignition electrode. Simultaneously, the valve on the burner gas line opens, allowing gas to enter the burner, where it mixes with the combustion-supporting air previously introduced to the burner and burns, forming a stable, specifically shaped flame. The flue gas generated by combustion passes through the all-ceramic optimized stud heat exchanger, and then through the flue gas channel formed by the interior of shell three and shell four and the exterior of the all-ceramic optimized stud heat exchanger, and enters the special-shaped tubular box heat exchanger to preheat the cold combustion air, thereby reducing emissions and consumption. This technology can increase energy consumption by 8~12%, and the NOx generation meets the domestic ultra-low standard level. It can be widely used in heating and heat treatment fields that require pulse combustion control and continuous adjustment.

[0046] While retaining the inherent advantages of the Type I self-preheating burner, a special-shaped tubular box heat exchanger is creatively added. The combustion air first enters the air inlet pipe, and the first and second shells are sealed and welded to form the combustion air inlet cavity. The first function is to increase the heat exchange contact area, and the second function is to cool the heat exchanger shell. The combustion air enters the special-shaped tubular box heat exchanger. The special-shaped tubular box heat exchanger consists of 198 special-shaped tubes for fully preheating the combustion air. The special-shaped tubes are flat in shape, which fully increases the heat exchange area. The flue gas channel is creatively added to guide the flue gas so that the flue gas preheats the air according to a certain stroke. The creative addition of all-ceramic optimized stud heat exchange allows the preheated combustion air to further preheat the combustion air. Because the combustion air in this section is already at a certain temperature, conventional heat-resistant steel pipes can no longer meet the temperature requirements. The material of this section has been further improved to meet on-site needs. The burner adopts a modular design as a whole, and maintenance and modification using this system is very simple. This type of burner has a wide power adjustment range. Burners of different specifications can achieve heating capacities ranging from 5 to 500 kW and can be widely used in metallurgical quenching, annealing and heat treatment fields.

[0047] The above are only preferred embodiments of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope of protection of the present invention.

Claims

1. A type I self-preheating burner with a special-shaped tubular ceramic stud double-stroke heat exchanger, characterized in that: The invention comprises a burner core (1), a special-shaped tubular box heat exchanger (2), an inner conduit (3) and a fully ceramic optimized stud heat exchanger (4), wherein the upper end of the fully ceramic optimized stud heat exchanger (4) is sleeved in the special-shaped tubular box heat exchanger (2), the lower end of the fully ceramic optimized stud heat exchanger (4) extends out of the special-shaped tubular box heat exchanger (2), the upper end of the inner conduit (3) is connected to the upper end of the special-shaped tubular box heat exchanger (2), the lower end of the inner conduit (3) extends into the inner cavity of the fully ceramic optimized stud heat exchanger (4), the burner core (1) is sleeved in the inner conduit (3), and the upper and lower ends of the burner core (1) extend from the upper and lower ends of the inner conduit (3) respectively; The burner core (1) includes a gas sealing channel, a combustion chamber (1.8), a central gas pipe (1.10), and a burner ignition and flame detection system. The combustion chamber (1.8) is arranged at the bottom of the gas sealing channel. The burner ignition and flame detection system is arranged on one side of the gas sealing channel. The lower end of the burner ignition and flame detection system extends into the combustion chamber (1.8). The lower end of the central gas pipe (1.10) extends into the combustion chamber (1.8). The gas sealing passage comprises a gas interface (1.1), a gas pipe (1.3), a gas nozzle (1.6) and a gas shell. The gas shell is provided with a gas interface (1.1). The upper end of the gas pipe (1.3) is connected to the gas shell and communicates with the inner cavity of the gas shell. The gas nozzle (1.6) is arranged at the lower end of the gas pipe (1.3) and is connected to the combustion chamber (1.8). The central gas pipe (1.10) is sleeved in the gas pipe (1.3). The upper end of the central gas pipe (1.10) passes through the gas pipe (1.3) and the gas shell, and the lower end of the central gas pipe (1.10) passes through the gas pipe (1.3) and the gas nozzle (1.6) to the combustion chamber (1.8). The burner ignition and flame detection system comprises an electrode assembly (1.9), the upper end of the electrode assembly (1.9) is connected to the gas shell, the middle part of the electrode assembly (1.9) is provided with an electrode conduit (1.4), the electrode conduit (1.4) is connected and fixed to the gas pipe (1.3) via an electrode conduit bracket (1.5), and the lower end of the electrode assembly (1.9) extends into the combustion chamber (1.8).

2. The I-type self-preheating burner with a special-shaped tubular ceramic stud double-stroke heat exchanger according to claim 1 is characterized in that: The special-shaped tube box heat exchanger (2) includes an inner sleeve, an outer sleeve, a flue gas outlet pipe (2.4) and an air inlet pipe (2.5). The inner sleeve is sleeved in the outer sleeve. An air cavity is left between the upper end of the inner sleeve and the upper end of the outer sleeve. An interlayer is provided on the inner wall of the outer sleeve, serving as a combustion air inlet cavity. The air inlet pipe (2.5) is provided on the outer sleeve and communicates with the interlayer of the outer sleeve. A plurality of special-shaped tubes are distributed between the inner sleeve and the outer sleeve. A flange 2 (2.10) is provided laterally in the inner cavity of the outer sleeve. Flange 2 (2.10) is arranged at the upper end of the inner sleeve, and an air and flue gas heat exchange cavity is formed between flange 2, the inner sleeve, the outer sleeve and the outer wall of the special-shaped tube. Flange 2 separates the air and flue gas heat exchange cavity from the air cavity. An annular gap cavity is provided at the lower end of the outer sleeve. The lower end of the inner cavity of the special-shaped tube is connected with the interlayer of the outer sleeve through the annular gap cavity. The upper end of the inner cavity of the special-shaped tube passes through flange 2 and is connected with the air cavity. A flow hole is opened on the inner wall of the inner sleeve to connect the inner cavity of the inner sleeve with the air and flue gas heat exchange cavity.

3. The I-type self-preheating burner with a special-shaped tubular ceramic stud double-stroke heat exchanger according to claim 2, characterized in that: The special-shaped tubes (2.7) include horizontal flat tubes and vertical flat tubes that are interconnected and alternately arranged along the same straight line.

4. The I-type self-preheating burner with a special-shaped tubular ceramic stud double-stroke heat exchanger according to claim 2, characterized in that: The outer sleeve includes a shell one (2.2) and a shell two (2.6), and the shell two (2.6) is sleeved in the shell one (2.2). The inner sleeve includes a shell three (2.8) and a shell four (2.3), and the shell three (2.8) and the shell four (2.3) are sleeved in the shell two (2.6) at intervals along the same axis. The shell one (2.2), the shell two (2.6), the shell three (2.8) and the shell four (2.3) are all cylindrical.

5. The I-type self-preheating burner with a special-shaped tubular ceramic stud double-stroke heat exchanger according to claim 2, characterized in that: The inner conduit (3) comprises a connecting pipe flange (3.1), a bushing (3.2), a bushing support plate (3.3) and a seamless pipe (3.4); the connecting pipe flange (3.1) is arranged at the upper end of the seamless pipe (3.4); the connecting pipe flange (3.1), the bushing (3.2) and the bushing support plate (3.3) are arranged on the seamless pipe (3.4) in sequence; a through hole is provided on the side wall of the seamless pipe (3.4); the through hole is located in the preheating air cavity; the inner conduit (3) is sealedly connected to the special-shaped tubular box heat exchanger (2) and the burner core (1) respectively through the connecting pipe flange (3.1); and the bushing (3.2) is arranged at the top of the preheating air cavity.

6. The I-type self-preheating burner with a special-shaped tubular ceramic stud double-stroke heat exchanger according to claim 5, characterized in that: The inner conduit (3) has a T-shaped structure, the outer diameter of the connecting pipe flange (3.1) is larger than the outer diameter of the bushing (3.2), the outer diameter of the bushing support plate (3.3), and the inner diameter of the outer sleeve, and the connecting pipe flange (3.1) cover is arranged at the upper end of the special-shaped tubular box heat exchanger (2).

7. The I-type self-preheating burner with a special-shaped tubular ceramic stud double-stroke heat exchanger according to claim 1, characterized in that: The all-ceramic optimized stud heat exchanger (4) is formed as a SiSiC integral body.

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