Rapid cold start flameless combustion furnace and control method

Abstract

The invention discloses a rapid cold start flameless combustion furnace and a control method, and relates to the technical field of combustion equipment.The rapid cold start flameless combustion furnace comprises a combustion furnace body and an inductance heating assembly, a combustion cavity is formed in the combustion furnace body, and the combustion cavity is provided with an air jet nozzle, a fuel nozzle and a tail gas exhaust port; the air jet nozzle and the fuel nozzle are oppositely distributed on the two opposite sides of the combustion cavity and arranged in an opposite jet mode, and the furnace wall of the combustion cavity is a metal component. The inductance heating assembly comprises an inductance coil spirally surrounding the periphery of the combustion furnace body, and the area surrounded by the inductance coil corresponds to the combustion cavity. According to the flameless combustion furnace, the furnace wall of the combustion cavity which is a metal component is heated through the inductance coil, so that the temperature in the combustion cavity is rapidly increased, the temperature of the furnace wall of the combustion cavity is higher than the spontaneous combustion temperature of fuel, the fuel is ignited, and rapid cold start and stable combustion of the flameless combustion furnace are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of combustion equipment, and in particular to a rapid cold start flameless combustion furnace and a control method thereof. Background Art

[0002] At present, flameless combustion technology can reduce emissions and improve combustion efficiency. Flameless combustion furnaces are used in many fields. However, the current flameless combustion furnaces have the following problems when in use: during the cold start stage, due to the low temperature of the furnace wall, it is difficult to achieve a rapid cold start, resulting in difficulty in sufficient combustion of the fuel during startup and difficulty in meeting emission standards. In addition, existing combustion devices all use ignition devices to ignite the fuel. First, the ignition device is prone to damage, resulting in a high equipment failure rate and increased maintenance costs. Second, it occupies space in the furnace, affecting the efficiency of flameless combustion. Summary of the invention The object of the present invention is to provide a rapid cold start flameless combustion furnace and a control method to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0003] The technical solutions adopted to solve the above technical problems are: The present invention provides a rapid cold start flameless combustion furnace, comprising: A combustion furnace body, wherein a combustion chamber is provided inside, wherein the combustion chamber is provided with at least one air jet nozzle, at least one fuel nozzle and an exhaust gas discharge port, wherein at least one air jet nozzle and at least one fuel nozzle are oppositely distributed on two opposite sides of the combustion chamber and are arranged in opposite jets, and the furnace wall of the combustion chamber is a metal component; The induction heating component comprises an induction coil spirally wound around the outer circumference of the combustion furnace body, and the area surrounded by the induction coil corresponds to the combustion chamber.

[0004] The rapid cold start flameless combustion furnace of the present invention has the following beneficial effects: When in use, the fuel and control are sprayed into the combustion chamber through the fuel nozzle and the air jet nozzle respectively, to achieve opposed flameless combustion. The present invention heats the furnace wall of the combustion chamber, which is a metal component, through the inductance coil, so that the temperature of the wall surface and the interior of the combustion chamber is increased, thereby significantly shortening the startup time, and improving the overall combustion efficiency, and increasing the speed of cold start of the flameless combustion furnace. At the same time, it also makes the temperature of the furnace wall of the combustion chamber greater than the auto-ignition temperature of the fuel, so as to ignite the fuel, and can avoid the complex ignition design in the combustion. In addition, during the operation of the flameless combustion furnace after startup, the heating function of the inductance coil can also be intervened in the flameless combustion to maintain the inside of the combustion chamber within the set temperature range, avoid the phenomenon of fire, and improve the stability of the flameless combustion furnace under low operating conditions.

[0005] As a further improvement of the above technical solution, at least one of the air jet nozzles and at least one of the fuel nozzles are arranged opposite to each other at an interval along a first direction, and the inductor coil is spirally wound along the first direction.

[0006] As a further improvement of the above technical solution, the inductance coil is an elastic telescopic spiral structure, and the induction heating component also includes a telescopic adjustment mechanism, the telescopic adjustment mechanism includes a first limiter, a second limiter and an adjustment drive structure, one end of the inductance coil is connected to the first limiter, and the other end of the inductance coil is connected to the second limiter, and the adjustment drive structure is respectively connected to the first limiter and the second limiter in transmission, and the adjustment drive structure is used to drive the first limiter and the second limiter to move along the first direction.

[0007] As a further improvement of the above technical solution, the induction heating assembly also includes a temperature measuring module and a controller. The temperature measuring module is used to detect the temperature of the furnace wall of the combustion chamber. The controller is respectively connected to the temperature measuring module, the induction coil, and the adjustment drive structure. The controller is used to receive the temperature signal of the temperature measuring module, control the start and stop of the induction coil, and control the adjustment drive structure to drive the first limiter and the second limiter to move, so as to drive the induction coil to move and extend along the first direction.

[0008] As a further improvement of the above technical solution, a plurality of air jet nozzles are provided, and the plurality of air jet nozzles are circumferentially spaced apart and arranged along the center line of the combustion chamber extending along the first direction, the plurality of air jet nozzles are close to the inner peripheral furnace wall of the combustion chamber, the fuel nozzle is located on the center line of the combustion chamber, the exhaust gas exhaust port and the air jet nozzle are located on the same side of the combustion chamber, the exhaust gas exhaust port is located on the center line of the combustion chamber, and the exhaust gas exhaust port and the fuel nozzle are arranged opposite to each other.

[0009] As a further improvement of the above technical solution, the combustion furnace body is provided with an air uniforming cavity, the air uniforming cavity is provided with an air inlet, an air baffle is provided between the air uniforming cavity and the combustion chamber, a plurality of air jet nozzles are installed on the air baffle, the inlet ends of the plurality of air jet nozzles are connected to the air uniforming cavity, the exhaust port is provided on the air baffle, the exhaust port is connected to an exhaust gas diffusion pipe, the exhaust gas diffusion pipe passes through the air uniforming cavity and the furnace wall of the combustion furnace body from the inside to the outside in sequence, and a plurality of exhaust gas diffusion ports are circumferentially distributed on one end of the exhaust gas diffusion pipe away from the combustion chamber.

[0010] As a further improvement of the above technical solution, the exhaust gas diffusion pipe and the uniform air chamber have a partition wall heat exchange relationship, and the uniform air chamber and the combustion chamber have a partition wall heat exchange relationship.

[0011] As a further improvement of the above technical solution, an air uniforming plate is provided inside the air uniforming chamber, the air uniforming plate is of multi-hole design, and the air uniforming plate is located between the air input port and the inlet ends of the plurality of air jet nozzles.

[0012] In addition, the present invention also proposes a control method, which is applied to the rapid cold start flameless combustion furnace, and the control method includes: According to the cold start working condition of flameless combustion, the induction coil is powered on to start, and the furnace wall of the combustion chamber is heated to the target temperature of flameless combustion; The air is sprayed into the combustion chamber through the air jet nozzle, and the fuel is sprayed into the combustion chamber through the fuel nozzle, so that the fuel and the air are mixed and burned to quickly start the combustion furnace; Real-time detection of temperature information of the furnace wall of the combustion chamber; The start and stop of the inductor coil is controlled according to the temperature information to keep the flameless combustion furnace to perform stable counter-flameless combustion.

[0013] As a further improvement of the above technical solution, the control method further includes: The first stopper and the second stopper are controlled to move along the first direction to drive the inductance coil to expand and contract and move along the first direction, and the inductance coil is controlled to locally heat the furnace wall of the combustion chamber.

[0014] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: The present invention will be further described below in conjunction with the accompanying drawings and embodiments; Figure 1 This is a structural schematic diagram of an embodiment of the rapid cold start flameless combustion furnace provided by the present invention; Figure 2 This is a schematic diagram of the internal structure of a combustion furnace body provided by the present invention, one embodiment thereof; Figure 3 This is a schematic structural diagram of an embodiment of the gas homogenizing chamber provided by the present invention; Figure 4 This is an operating principle diagram of an embodiment of the rapid cold start flameless combustion furnace provided by the present invention; Figure 5 This is a flow chart of an embodiment of the control method provided by the present invention; Figure Number: Combustion furnace body 100; combustion chamber 110; air jet nozzle 120; fuel nozzle 130; tail gas discharge port 140; air uniformity chamber 150; air input port 151; air uniformity plate 152; air baffle 160; tail gas discharge pipe 170; tail gas discharge port 171; Inductive heating assembly 200 ; inductive coil 210 ; telescopic adjustment mechanism 220 ; first stopper 221 ; second stopper 222 ; stopper connecting rod 223 ; temperature measuring module 230 ; controller 240 . DETAILED DESCRIPTION

[0016] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0017] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0018] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0019] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments.

[0021] Current flameless combustion furnaces have the following problems when in use: during the cold start stage, due to the low furnace wall temperature, it is difficult to achieve a rapid cold start, resulting in difficulty in sufficient combustion of the fuel during startup and difficulty in meeting emission standards. In addition, existing combustion devices all use ignition devices to ignite the fuel. Firstly, the ignition device is easily damaged, resulting in a high equipment failure rate and increased maintenance costs. Secondly, it occupies space in the furnace, affecting the efficiency of flameless combustion. Therefore, the present invention proposes a rapid cold start flameless combustion furnace to achieve a rapid cold start of the flameless combustion furnace, while eliminating the original ignition device and improving the stability of flameless combustion.

[0022] like Figure 1 As shown, the rapid cold start flameless combustion furnace of the present invention comprises a combustion furnace body 100 and an induction heating component 200 .

[0023] like Figure 2 As shown, a combustion chamber 110 is provided inside the combustion furnace body 100 of the present embodiment, wherein the combustion furnace body 100 of the present embodiment is vertically arranged in the up and down directions, and the combustion furnace body 100 is a cylindrical shell structure. In some other embodiments, the combustion furnace body 100 may be placed in other directions, for example, it may be a horizontal furnace structure, and the combustion chamber 110 may also be other shapes. The combustion chamber 110 of the present embodiment is a cylindrical cavity, which mainly allows the counter-mixing of fuel and air to be more complete.

[0024] The combustion chamber 110 of the present invention is provided with at least one air jet nozzle 120, at least one fuel nozzle 130 and an exhaust gas discharge port 140. The air jet nozzle 120 and the fuel nozzle 130 are oppositely distributed on two sides of the combustion chamber 110 and are arranged in opposite jets. Figure 2 As shown, the air jet nozzle 120 of this embodiment is arranged on the upper side of the combustion chamber 110, and the fuel nozzle 130 is arranged on the lower side of the combustion chamber 110. The air jet nozzle 120 and the fuel nozzle 130 present opposite jets up and down. The injection direction of the air jet nozzle 120 is downward, and the injection direction of the fuel nozzle 130 is upward. When in use, the air jet nozzle 120 is connected to the air supply system, and the fuel nozzle 130 is connected to the fuel supply system. The fuel and control are respectively sprayed into the combustion chamber 110 through the fuel nozzle 130 and the air jet nozzle 120 to achieve counter-injection flameless combustion.

[0025] The tail gas discharge port 140 is used to discharge the smoke in the combustion chamber 110 to the outside.

[0026] Specifically, Figure 2As shown, a plurality of air jet nozzles 120 are provided, and the plurality of air jet nozzles 120 are circumferentially spaced and distributed along the center line of the combustion chamber 110 in the up-down direction. The plurality of air jet nozzles 120 are close to the inner peripheral furnace wall of the combustion chamber 110 to achieve a uniform flow field in the combustion chamber 110 and form a central reflow flow field. The jet air of the air jet nozzle 120 is jetted along the furnace wall to prevent the furnace wall from overheating and effectively protect the furnace wall. The air jet nozzle 120 has a certain length to increase the air flow rate so that the air jet nozzle 120 has sufficient kinetic energy to provide heat flow to the combustion chamber 110 to form a stable flow field with a high flow rate.

[0027] The fuel nozzle 130 is located at the center of the lower side of the combustion chamber 110 and is also located on the center line, so as to achieve accurate injection of fuel into the recirculation flow field in the combustion chamber 110, and further avoid air jets, and preferentially mix with gases with low oxygen concentration. This design can achieve stable flameless combustion. The fuel nozzle 130 has a certain length to ensure that the fuel nozzle is located in the high temperature area of ​​the combustion chamber 110. At the same time, the oxygen concentration here is low, which can slow down the combustion speed of the fuel here. This design is conducive to the formation and stabilization of flameless combustion.

[0028] In this embodiment, the exhaust gas exhaust port 140 and the air jet nozzle 120 are located on the same side of the combustion chamber 110, and the exhaust gas exhaust port 140 is located at the center of the upper side of the combustion chamber 110, and the exhaust gas exhaust port 140 and the fuel nozzle 130 are arranged to face each other up and down, the jet direction of the air jet nozzle 120 is downward, and the exhaust direction of the exhaust gas exhaust port 140 is upward.

[0029] The design of the above-mentioned exhaust gas exhaust port 140, air jet nozzle 120 and fuel nozzle 130 can reduce the interference with the flow field in the combustion chamber 110 to achieve the purpose of mixing low-oxygen concentration gas with fuel. Stable flameless combustion requires that the oxygen concentration in the combustion chamber 110 be controlled between 5% and 15%. The air jet nozzle 120 will carry a large amount of exhaust gas to the fuel nozzle 130 when spraying air. When the air and exhaust gas flow to the fuel nozzle 130 with the flow field, the oxygen concentration can be reduced to the target range concentration to achieve the overall oxygen concentration control of the combustion chamber 110. This design avoids the complicated design of the counter-type flameless combustion furnace and cleverly achieves the control of oxygen concentration.

[0030] Furthermore, if Figure 2 and 3As shown, the combustion furnace body 100 of the present embodiment is provided with an air uniforming cavity 150, which is located at the top of the combustion furnace body 100, and the air uniforming cavity 150 is provided with an air inlet 151, which is connected to the air supply system, and an air baffle 160 is provided between the air uniforming cavity 150 and the combustion chamber 110, and a plurality of air jet nozzles 120 are installed on the air baffle 160, and the inlet ends of the plurality of air jet nozzles 120 are connected to the air uniforming cavity 150, and the exhaust gas discharge port 140 is provided at the center of the air baffle 160, and the exhaust gas discharge port 140 is connected to an exhaust gas diffusion pipe 170 extending up and down, and the exhaust gas diffusion pipe 170 passes through the air uniforming cavity 150 and the furnace wall of the combustion furnace body 100 from the inside to the outside in turn, and extends out of the combustion furnace body 100. When in use, air is transported to each air jet nozzle 120 through the air uniforming cavity 150, and smoke is discharged outward through the exhaust gas diffusion pipe 170.

[0031] The combustion chamber 110 and the uniform gas chamber 150 of this embodiment both use the furnace wall as their wall surface and share the same furnace wall to achieve flameless combustion with a simple structure, leaving enough space for the outer inductive heating component 200, while also saving manufacturing costs.

[0032] The uniform air chamber 150 of this embodiment is arranged up and down with the combustion chamber 110, which can make the layout simpler and the structure more compact. At the same time, the uniform air chamber 150 can form a wall heat exchange relationship with the combustion chamber 110 through the air baffle 160 to protect the furnace wall of the combustion chamber 110 and prevent overheating.

[0033] In addition, the exhaust gas discharging pipe 170 of this embodiment has a plurality of exhaust gas discharging ports 171 distributed circumferentially at one end away from the combustion chamber 110 , so as to form back pressure at the exhaust gas discharging ports 171 , limit the gas overflow from the combustion chamber 110 , and increase the gas residence time inside the combustion chamber 110 .

[0034] Furthermore, if Figure 2 and 3 As shown, the interior of the air uniforming chamber 150 of the present embodiment is provided with an air uniforming plate 152, and the air uniforming plate 152 is of multi-porous design. The air uniforming plate 152 is located between the air input port 151 and the inlet ends of the plurality of air jet nozzles 120, so as to realize that the air forms a uniform airflow after passing through the air uniforming plate 152. The air uniforming plate 152 of the present embodiment is an annular plate structure, and the inner ring of the air uniforming plate 152 is mounted on the outer periphery of the exhaust gas emission pipe 170, and the outer periphery of the air uniforming plate 152 is connected to the inner peripheral wall of the air uniforming chamber 150.

[0035] Furthermore, the lower end of the exhaust gas diffusion pipe 170 of the present embodiment is connected to the combustion chamber 110, and the upper ends of the two exhaust gas diffusion pipes 170 pass through the air baffle 160, the air uniforming plate 152 and the furnace wall in sequence. The exhaust gas diffusion pipe 170 passes through the interior of the air uniforming chamber 150 and forms a wall heat exchange relationship with the air uniforming chamber 150, which can preheat the air and ensure the energy utilization rate.

[0036] During operation, air and ammonia fuel enter the combustion chamber 110 through the air jet nozzle 120 and the fuel nozzle 130 respectively, and combine with the furnace wall to achieve a stable flow field that satisfies flameless combustion. The combustion exhaust gas is discharged from the exhaust gas discharge port 171 through the exhaust gas discharge pipe 170 to achieve the exhaust gas discharge effect. The air enters the uniform air chamber 150 through the air input port 151, and passes through the uniform air plate 152 in the uniform air chamber 150 again to achieve air delivery to the air jet nozzle 120 at a uniform flow rate, thereby ensuring that the flow rates of multiple air jet nozzles 120 in the combustion chamber 110 are the same.

[0037] The furnace wall of the combustion chamber 110 of this embodiment is a metal component. It can be understood that the outer peripheral wall of the combustion furnace body 100 is the furnace wall of the combustion chamber 110, and the outer peripheral wall of the combustion furnace body 100 is a metal component. The metal furnace wall is used to realize inductive heating reaction with the induction coil 210.

[0038] like Figure 1 As shown, the induction heating assembly 200 of the present invention includes an induction coil 210 spirally wrapped around the periphery of the combustion furnace body 100, wherein the area surrounded by the induction coil 210 corresponds to the combustion chamber 110. It can be understood that the induction coil 210 is wrapped around the outer peripheral side of the combustion chamber 110.

[0039] The present invention heats the furnace wall of the combustion chamber 110, which is a metal component, through the inductance coil 210, so that the temperature inside the combustion chamber 110 is increased, thereby improving the cold start speed of the flameless combustion furnace. At the same time, the temperature of the furnace wall of the combustion chamber 110 is also made greater than the auto-ignition temperature of the fuel, thereby igniting the fuel. The complex ignition design in the combustion can be avoided, and during the operation of the flameless combustion furnace after the startup, the heating function of the inductance coil 210 can also be intervened in the flameless combustion to maintain the temperature inside the combustion chamber 110 within a set temperature range, thereby avoiding the occurrence of fire and improving the stability of the flameless combustion furnace under low operating conditions.

[0040] In addition, the furnace wall of the combustion chamber 110 of the present embodiment is made of a homogeneous thin-walled metal material to enable the inductor coil 210 to heat the furnace wall of the combustion chamber 110. The alternating magnetic field generates eddy currents inside the metal tube, causing the atoms inside the metal tube to move irregularly at high speed. The collision and friction between the atoms generate heat, thereby achieving a heating effect. The furnace wall of the combustion chamber 110 is thin-walled to match the skin effect of the heating by the inductor coil 210 to enhance the heating efficiency. High-frequency current will cause a skin effect, forcing alternating current to flow to the surface of the furnace wall in the form of a thin layer, increasing the resistance of the conductor, thereby greatly improving the heating effect of the furnace wall.

[0041] The air jet nozzle 120 and the fuel nozzle 130 of this embodiment are arranged opposite to each other in the up-down direction with an interval, and the inductor coil 210 of this embodiment is arranged spirally wound in the up-down direction. The inductor coil 210 is used to heat the combustion chamber 110 between the air jet nozzle 120 and the fuel nozzle 130 to improve the stability of the air jet nozzle 120 and the fuel nozzle 130, so as to obtain the maximum latent heat of combustion when the fuel and air are mixed and burned.

[0042] Furthermore, the inductor coil 210 of the present embodiment is an elastic telescopic spiral structure, and the inductor heating component 200 further includes a telescopic adjustment mechanism 220, which includes a first stopper 221, a second stopper 222 and an adjustment drive structure. The upper end of the inductor coil 210 is connected to the first stopper 221, and the lower end of the inductor coil 210 is connected to the second stopper 222. The adjustment drive structure is respectively connected to the first stopper 221 and the second stopper 222 in a transmission connection, and the adjustment drive structure is used to drive the first stopper 221 and the second stopper 222 to move in the up and down directions. It should be noted that the adjusting driving structure can separately drive the first limiter 221 and the second limiter 222 to move, or the adjusting driving structure can synchronously drive the first limiter 221 and the second limiter 222 to move, wherein the moving strokes can be different, so that the upper and lower ends of the inductor 210 can move in the up and down directions to realize the extension and retraction of the inductor 210, and can move in the up and down directions relative to the combustion furnace body 100, so that the inductor 210 can correspond to different positions of the combustion chamber 110 in the up and down directions to heat different positions.

[0043] like Figure 4 As shown, during a cold start, the inductor coil 210 is first stretched out to heat the entire combustion chamber 110, and then the inductor coil 210 is contracted and moved to a position corresponding to the outlet area of ​​the fuel nozzle 130. The inductor coil 210 is used to heat the portion of the combustion chamber 110 located in the outlet area of ​​the fuel nozzle 130. At this time, since the inductor coil 210 is contracted, the combustion chamber 110 can be heated to a higher temperature under the same current. At this time, the temperature of the portion of the outlet area of ​​the fuel nozzle 130 can be made higher than the natural temperature of the fuel, so as to improve the success rate of ignition.

[0044] During normal operation of the combustion furnace body 100, the position and telescopic range of the inductor coil 210 can also be changed to locally heat the combustion chamber 110 to maintain stable combustion of the fuel, especially under low operating conditions, which can effectively avoid fires.

[0045] Regarding the specific structure of the adjustable driving structure, in some other embodiments, the adjustable driving structure may include two linear driving units, which are respectively connected to the first limiter 221 and the second limiter 222 for transmission, and the first limiter 221 and the second limiter 222 are respectively driven to move in the up and down directions by the two linear driving units.

[0046] The adjustment drive structure of this embodiment includes a driving component built into the first limiter 221 and the second limiter 222. The first limiter 221 and the second limiter 222 are connected by a limiter connecting rod 223. The limiter connecting rod 223 has a spiral slide rail. Under the drive of each driving component, the up and down movement of the first limiter 221 and the second limiter 222 can be controlled to achieve effective control and positioning of the first limiter 221 and the second limiter 222. The driving component can be a nut and a motor. The motor drives the nut to rotate, and the nut is spirally fitted with the spiral slide rail. The first limiter 221 and the second limiter 222 are both connected to the limiter connecting rod 223 in an up and down sliding manner.

[0047] Furthermore, the inductive heating assembly 200 of the present embodiment also includes a temperature measuring module 230 and a controller 240, wherein the temperature measuring module 230 is used to detect the temperature of the furnace wall of the combustion chamber 110, and the controller 240 is respectively connected to the temperature measuring module 230, the inductive coil 210, and the adjusting drive structure, and the controller 240 is used to receive the temperature signal of the temperature measuring module 230, control the start and stop of the inductive coil 210, and control the adjusting drive structure to drive the first limiter 221 and the second limiter 222 to move, so as to drive the inductive coil 210 to move and extend in the up and down directions.

[0048] The temperature measurement module 230 of this embodiment is extended up and down along the furnace wall of the combustion chamber 110 and has multiple temperature detection sensors to meet the real-time monitoring of the furnace wall of the combustion chamber 110 and generate temperature information to feed back to the controller 240.

[0049] In some embodiments, the inductor 210 needs to have overheat protection. Since the temperature generated by combustion is too high, the high temperature will directly damage the inductor 210 and other components, so it is necessary to cool it down by some means. Condensed water can be passed into the inductor 210, and the hollow inductor 210 material can be used; or a cooling medium can be added to the wall of the opposed flameless combustion furnace, so that the cooling medium flows through the furnace wall to cool it down, which not only protects the inductor 210 and other components, but also protects the furnace wall of the combustion chamber 110 from overheating.

[0050] In addition, the present invention also proposes a control method, which is applied to the rapid cold start of a flameless combustion furnace, such as Figure 5 As shown, the control method includes: Step S100: According to the cold start condition of flameless combustion, the inductor 210 is powered on to start, and the furnace wall of the combustion chamber 110 is heated to the target temperature of flameless combustion; Step S200: spraying air into the combustion chamber 110 through the air jet nozzle 120, and spraying fuel into the combustion chamber 110 through the fuel nozzle 130, so that the fuel and air are mixed and burned to quickly start the combustion furnace; Step S300: Real-time detection of the temperature information of the furnace wall of the combustion chamber 110; Step S400: Control the start and stop of the inductor coil 210 according to the temperature information to maintain the flameless combustion furnace to perform stable counter-flameless combustion.

[0051] In step S100, at the time of cold start, the target temperature of flameless combustion is greater than the fuel auto-ignition temperature to achieve the ignition function.

[0052] In step S300 , the temperature of the furnace wall is detected by the temperature measurement module 230 .

[0053] In step S400, after the furnace wall of the combustion chamber 110 rises to the set temperature, the controller 240 will control the inductor coil 210 to be turned off, so as to control the post-startup process of the opposed flameless combustion furnace.

[0054] Furthermore, the control method further includes: Step S500 : Control the first stopper 221 and the second stopper 222 to move along the first direction, so as to drive the inductor 210 to expand and contract and move along the first direction, and control the inductor 210 to locally heat the furnace wall of the combustion chamber 110 .

[0055] The present invention realizes effective control of the cold start process and post-start process of the opposed flameless combustion furnace by controlling the inductor coil 210, temperature monitoring, temperature information feedback and linkage coupling control of the adjustment drive structure, and can meet the needs of rapid cold start and continuous stable flameless combustion of the opposed flameless combustion furnace.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0057] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A rapid cold start flameless combustion furnace, characterized in that: include: A combustion furnace body, wherein a combustion chamber is provided inside, wherein the combustion chamber is provided with at least one air jet nozzle, at least one fuel nozzle and an exhaust gas discharge port, wherein at least one air jet nozzle and at least one fuel nozzle are oppositely distributed on two opposite sides of the combustion chamber and are arranged in opposite jets, and the furnace wall of the combustion chamber is a metal component; The induction heating component comprises an induction coil spirally wound around the outer circumference of the combustion furnace body, and the area surrounded by the induction coil corresponds to the combustion chamber.

2. The rapid cold start flameless combustion furnace according to claim 1, characterized in that: At least one of the air jet nozzles and at least one of the fuel nozzles are arranged opposite to each other at an interval along a first direction, and the inductor coil is spirally wound along the first direction.

3. The rapid cold start flameless combustion furnace according to claim 2, characterized in that: The inductance coil is an elastic telescopic spiral structure, and the induction heating component also includes a telescopic adjustment mechanism, which includes a first limiter, a second limiter and an adjustment drive structure. One end of the inductance coil is connected to the first limiter, and the other end of the inductance coil is connected to the second limiter. The adjustment drive structure is respectively connected to the first limiter and the second limiter in a transmission manner, and the adjustment drive structure is used to drive the first limiter and the second limiter to move along the first direction.

4. The rapid cold start flameless combustion furnace according to claim 3, characterized in that: The induction heating assembly also includes a temperature measuring module and a controller. The temperature measuring module is used to detect the temperature of the furnace wall of the combustion chamber. The controller is respectively connected to the temperature measuring module, the induction coil, and the adjustment drive structure. The controller is used to receive the temperature signal of the temperature measuring module, control the start and stop of the induction coil, and control the adjustment drive structure to drive the first limiter and the second limiter to move, so as to drive the induction coil to move and extend along the first direction.

5. The rapid cold start flameless combustion furnace according to claim 2, characterized in that: There are multiple air jet nozzles, and the multiple air jet nozzles are circumferentially spaced and distributed along the center line of the combustion chamber extending along the first direction. The multiple air jet nozzles are close to the inner furnace wall of the combustion chamber, the fuel nozzle is located on the center line of the combustion chamber, the exhaust gas exhaust port and the air jet nozzle are located on the same side of the combustion chamber, the exhaust gas exhaust port is located on the center line of the combustion chamber, and the exhaust gas exhaust port and the fuel nozzle are arranged opposite to each other.

6. The rapid cold start flameless combustion furnace according to claim 5, characterized in that: The combustion furnace body is provided with an air uniforming cavity, the air uniforming cavity is provided with an air inlet, an air baffle is provided between the air uniforming cavity and the combustion chamber, a plurality of air jet nozzles are installed on the air baffle, the inlet ends of the plurality of air jet nozzles are connected with the air uniforming cavity, the exhaust port is provided on the air baffle, the exhaust port is connected with an exhaust gas diffusion pipe, the exhaust gas diffusion pipe passes through the air uniforming cavity and the furnace wall of the combustion furnace body from the inside to the outside in sequence, and a plurality of exhaust gas diffusion ports are circumferentially distributed at one end of the exhaust gas diffusion pipe away from the combustion chamber.

7. The rapid cold start flameless combustion furnace according to claim 6, characterized in that: The tail gas emission pipe and the uniform air chamber have a wall heat exchange relationship, and the uniform air chamber and the combustion chamber have a wall heat exchange relationship.

8. The rapid cold start flameless combustion furnace according to claim 6, characterized in that: An air-homogenizing plate is arranged inside the air-homogenizing cavity. The air-homogenizing plate is of multi-hole design and is located between the air input port and the inlet ends of the plurality of air jet nozzles.

9. A control method, characterized in that: Applied to the rapid cold start flameless combustion furnace according to any one of claims 1 to 8, the control method comprises: According to the cold start working condition of flameless combustion, the induction coil is powered on to start, and the furnace wall of the combustion chamber is heated to the target temperature of flameless combustion; The air is sprayed into the combustion chamber through the air jet nozzle, and the fuel is sprayed into the combustion chamber through the fuel nozzle, so that the fuel and the air are mixed and burned to quickly start the combustion furnace; Real-time detection of temperature information of the furnace wall of the combustion chamber; The start and stop of the inductor coil is controlled according to the temperature information to keep the flameless combustion furnace to perform stable counter-flameless combustion.

10. The control method according to claim 9, characterized in that: With respect to the rapid cold start flameless combustion furnace according to claim 3, the control method further comprises: The first stopper and the second stopper are controlled to move along the first direction to drive the inductance coil to expand and contract and move along the first direction, and the inductance coil is controlled to locally heat the furnace wall of the combustion chamber.

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