A rapid cold start flameless combustion furnace and control method

Abstract

The present invention discloses a rapid cold-start flameless combustion furnace and a control method, which relate to the technical field of combustion equipment. The rapid cold-start flameless combustion furnace includes a combustion furnace body and an inductive heating component. A combustion chamber is provided inside the combustion furnace body. The combustion chamber is provided with an air jet nozzle, a fuel nozzle and an exhaust gas outlet. The air jet nozzle and the fuel nozzle are oppositely distributed on opposite sides of the combustion chamber and are arranged in an opposite jet. The furnace wall of the combustion chamber is a metal component; the inductive heating component includes an inductive coil spirally wound around the outer periphery of the combustion furnace body, and the area surrounded by the inductive coil corresponds to the combustion chamber. The present invention heats the furnace wall of the combustion chamber, which is a metal component, through the inductive coil, so that the temperature inside the combustion chamber rises rapidly, and the temperature of the furnace wall of the combustion chamber is higher than the autoignition temperature of the fuel, thereby igniting the fuel and realizing the rapid cold start and stable combustion of the flameless combustion furnace.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion equipment, and particularly relates to a flameless combustion furnace with rapid cold start and a control method therefor. Background Art

[0002] At present, flameless combustion technology can reduce emissions and improve combustion efficiency, and flameless combustion furnaces are used in many fields. However, the current flameless combustion furnaces have the following problems when in use: In the cold start stage, due to the low temperature of the furnace wall, it is difficult to achieve rapid cold start, resulting in insufficient combustion of fuel during start-up and difficult to meet emission standards. In addition, existing combustion devices all use ignition devices to ignite fuel. On the one hand, the ignition devices are prone to damage, resulting in a high failure rate of the equipment and increased maintenance costs. On the other hand, they occupy the space inside the furnace and affect the efficiency of flameless combustion. Summary of the Invention

[0003] The purpose of the present invention is to provide a flameless combustion furnace with rapid cold start and a control method therefor, so as to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The technical solutions adopted to solve the above technical problems are as follows:

[0005] The present invention provides a flameless combustion furnace with rapid cold start, including:

[0006] A combustion furnace body, with a combustion chamber inside. The combustion chamber is provided with at least one air jet nozzle, at least one fuel nozzle and an exhaust gas discharge port. At least one of the air jet nozzles and at least one of the fuel nozzles are distributed oppositely on opposite sides of the combustion chamber and are arranged to jet oppositely. The furnace wall of the combustion chamber is a metal component;

[0007] An inductive heating component, including an inductive coil spirally wound around the outer periphery of the combustion furnace body, and the area surrounded by the inductive coil corresponds to the combustion chamber.

[0008] The beneficial effects of the flameless combustion furnace with rapid cold start of the present invention are:

[0009] In use, fuel and control are respectively injected into the combustion chamber in a counter-jet manner through a fuel nozzle and an air jet nozzle to achieve counter-jet flameless combustion. In the present invention, an inductor coil heats the furnace wall of the combustion chamber, which is a metal component, so that the temperature of the wall surface and the interior of the combustion chamber increases, thereby significantly shortening the start-up time, improving the overall combustion efficiency, increasing the cold start speed of the flameless combustion furnace, and also making the temperature of the furnace wall of the combustion chamber higher than the fuel auto-ignition temperature to achieve fuel ignition, avoiding complex ignition designs inside the combustion, and during the operation of the flameless combustion furnace after start-up, the heating function of the inductor coil can also be involved in the flameless combustion to maintain the temperature inside the combustion chamber within a set range, preventing misfires and improving the stability of the flameless combustion furnace during low-load operation.

[0010] 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 at intervals and oppositely along a first direction, and the inductor coil is spirally wound along the first direction.

[0011] As a further improvement of the above technical solution, the inductor coil is an elastic telescopic spiral structure, and the inductive heating assembly further includes a telescopic adjustment mechanism. The telescopic adjustment mechanism includes a first limiter, a second limiter, and an adjustment driving structure. One end of the inductor coil is connected to the first limiter, the other end of the inductor coil is connected to the second limiter, and the adjustment driving structure is respectively in transmission connection with the first limiter and the second limiter. The adjustment driving structure is used to drive the first limiter and the second limiter to move along the first direction.

[0012] As a further improvement of the above technical solution, the inductive heating assembly further includes a temperature measurement module and a controller. The temperature measurement module is used to detect the temperature of the furnace wall of the combustion chamber. The controller is respectively connected to the temperature measurement module, the inductor coil, and the adjustment driving structure. The controller is used to receive the temperature signal of the temperature measurement module, control the start and stop of the inductor coil, and control the adjustment driving structure to drive the first limiter and the second limiter to move, so as to drive the inductor coil to move and stretch along the first direction.

[0013] As a further improvement of the above technical solution, there are multiple air jet nozzles, and the multiple air jet nozzles are circumferentially and spacedly distributed along the center line extending in the first direction of the combustion chamber. The multiple 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 outlet and the air jet nozzles are on the same side of the combustion chamber. The exhaust gas outlet is located on the center line of the combustion chamber and is arranged opposite to the fuel nozzle.

[0014] As a further improvement of the above technical solution, the combustion furnace body is provided with a gas homogenizing chamber, the gas homogenizing chamber is provided with an air inlet, an air partition is arranged between the gas homogenizing chamber and the combustion chamber, a plurality of the air jet nozzles are installed on the air partition, the inlet ends of the plurality of air jet nozzles are communicated with the gas homogenizing chamber, the tail gas discharge port is arranged on the air partition, a tail gas discharge pipe is connected to the tail gas discharge port, the tail gas discharge pipe sequentially passes through the gas homogenizing chamber and the furnace wall of the combustion furnace body from inside to outside, and a plurality of tail gas discharge ports are circumferentially distributed at one end of the tail gas discharge pipe away from the combustion chamber.

[0015] As a further improvement of the above technical solution, the tail gas discharge pipe and the gas homogenizing chamber have a relationship of heat exchange through a partition wall, and the gas homogenizing chamber and the combustion chamber have a relationship of heat exchange through a partition wall.

[0016] As a further improvement of the above technical solution, a gas homogenizing plate is arranged inside the gas homogenizing chamber, the gas homogenizing plate is designed with multiple pores, and the gas homogenizing plate is located between the air inlet and the inlet ends of the plurality of air jet nozzles.

[0017] In addition, the present invention also provides a control method, which is applied to the rapid cold start flameless combustion furnace, and the control method includes:

[0018] According to the cold start working condition of flameless combustion, energize the inductance coil to start, heat the furnace wall of the combustion chamber to heat to the target temperature of flameless combustion;

[0019] Inject air into the combustion chamber through the air jet nozzles, and inject fuel into the combustion chamber through the fuel nozzles, so that the fuel and air are mixed and burned to quickly start the combustion furnace;

[0020] Real-time detect the temperature information of the furnace wall of the combustion chamber;

[0021] According to the temperature information, control the start and stop of the inductance coil to keep the flameless combustion furnace performing stable counter-jet flameless combustion.

[0022] As a further improvement of the above technical solution, the control method further includes:

[0023] Control the first limiter and the second limiter to move along the first direction, so as to drive the inductance coil to expand, contract and move along the first direction, and control the inductance coil to locally heat the furnace wall of the combustion chamber.

[0024] Other features and advantages of the present invention will be described in the subsequent specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. Brief Description of the Drawings

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, where:

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments;

[0027] Figure 1 is a schematic structural diagram of a rapid cold start flameless combustion furnace provided by the present invention, showing one embodiment;

[0028] Figure 2 is a schematic internal structural diagram of a combustion furnace body provided by the present invention, showing one embodiment;

[0029] Figure 3 is a schematic structural diagram of an air distribution chamber provided by the present invention, showing one embodiment;

[0030] Figure 4 is a schematic operating principle diagram of a rapid cold start flameless combustion furnace provided by the present invention, showing one embodiment;

[0031] Figure 5 is a schematic flow diagram of a control method provided by the present invention, showing one embodiment;

[0032] Reference numerals in the drawings:

[0033] Combustion furnace body 100; combustion chamber 110; air jet nozzle 120; fuel nozzle 130; tail gas discharge port 140; air distribution chamber 150; air inlet 151; air distribution plate 152; air partition 160; tail gas discharge pipe 170; tail gas discharge port 171;

[0034] Inductive heating assembly 200; inductive coil 210; telescopic adjustment mechanism 220; first limiter 221; second limiter 222; limiter connecting rod 223; temperature measurement module 230; controller 240. Detailed implementation manners

[0035] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0036] In the description of the present invention, it should be understood that with respect to the orientation description, such as up, down, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It is 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 construed as limiting the present invention.

[0037] In the description of the present invention, "a plurality of" refers to more than two. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features, and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0038] In the description of the present invention, unless otherwise clearly defined, terms such as "arrangement", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0039] Next, the technical solution of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the following described embodiments are some embodiments of the present invention, not all embodiments.

[0040] The existing flameless combustion furnace has the following problems when in use: In the cold start stage, due to the low temperature of the furnace wall, it is difficult to achieve a rapid cold start, resulting in insufficient combustion of the fuel during startup and difficult to meet the emission standards. In addition, the existing combustion devices all use ignition devices to ignite the fuel. On the one hand, the ignition devices are prone to damage, resulting in a high failure rate of the equipment and an increase in maintenance costs. On the other hand, it occupies the space inside the furnace and affects the efficiency of flameless combustion. Therefore, the present invention proposes a flameless combustion furnace with rapid cold start to achieve the rapid cold start of the flameless combustion furnace, while eliminating the original ignition device and improving the stability of flameless combustion.

[0041] As Figure 1 shown, the flameless combustion furnace with rapid cold start of the present invention includes a combustion furnace body 100 and an inductive heating assembly 200.

[0042] As Figure 2 shown, a combustion chamber 110 is provided inside the combustion furnace body 100 of this embodiment. The combustion furnace body 100 of this embodiment is vertically arranged in the up and down direction, and the combustion furnace body 100 is a cylindrical shell structure. In some other embodiments, the combustion furnace body 100 can be placed in other directions, for example, it can be a horizontal furnace structure, and the combustion chamber 110 can also be of other shapes. The combustion chamber 110 of this embodiment is a cylindrical chamber, mainly to make the counter-flow mixing of fuel and air more sufficient.

[0043] 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 opposite sides of the combustion chamber 110 and are arranged in opposite jets. As Figure 2As shown, the air jet nozzle 120 of this embodiment is arranged on the upper side of the combustion chamber 110, while 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 perform counter-jetting in the up-and-down direction. The jetting direction of the air jet nozzle 120 is downward, and the jetting direction of the fuel nozzle 130 is upward. During 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. Fuel and air are respectively jetted into the combustion chamber 110 in a counter-jet manner through the fuel nozzle 130 and the air jet nozzle 120 to achieve counter-jet flameless combustion.

[0044] The tail gas discharge port 140 is used to discharge the flue gas in the combustion chamber 110 to the outside.

[0045] Specifically, as Figure 2 shown, there are multiple air jet nozzles 120. The multiple air jet nozzles 120 are circumferentially and spacedly distributed along the center line of the combustion chamber 110 in the up-and-down direction. The multiple air jet nozzles 120 are close to the inner circumferential furnace wall of the combustion chamber 110 to achieve a uniform flow field in the combustion chamber 110 and form a central recirculation flow field. Moreover, the jet air of the air jet nozzles 120 jets along the furnace wall, which can prevent the furnace wall from overheating and effectively protect the furnace wall. The air jet nozzles 120 have a certain length to increase the air flow velocity, so that the air jet nozzles 120 have sufficient kinetic energy to provide heat flow for the combustion chamber 110 to form a stable flow field with a high flow velocity.

[0046] The fuel nozzle 130 is located at the central position on the lower side of the combustion chamber 110 and is also located on the center line to accurately jet the fuel into the recirculation flow field in the combustion chamber 110 where it is located, and further avoid the air jet, and preferentially mix with the gas with a low oxygen concentration. This design can achieve stable flameless combustion. The fuel nozzle 130 has a certain length to ensure that the fuel injection port is located in the high-temperature area of the combustion chamber 110. At the same time, the oxygen concentration here is relatively low, which can slow down the combustion speed of the fuel here. This design is beneficial to the formation and stability of flameless combustion.

[0047] The tail gas discharge port 140 of this embodiment and the air jet nozzle 120 are located on the same side of the combustion chamber 110. The tail gas discharge port 140 is located at the central position on the upper side of the combustion chamber 110, and the tail gas discharge port 140 and the fuel nozzle 130 are arranged facing each other in the up-and-down direction. The jetting direction of the air jet nozzle 120 is downward, and the exhaust direction of the tail gas discharge port 140 is upward.

[0048] The designs of the above-mentioned exhaust gas outlet 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. For stable flameless combustion, the oxygen concentration in the combustion chamber 110 needs to be controlled between 5% and 15%. When the air jet nozzle 120 injects air, a large amount of exhaust gas will be carried to the fuel nozzle 130. When the air and exhaust gas flow to the fuel nozzle 130 along 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 complex design of the counter-jet flameless combustion furnace and cleverly realizes the control of the oxygen concentration.

[0049] Further, as Figure 2 and 3 shown, the combustion furnace body 100 of this embodiment is provided with a gas distribution chamber 150. The gas distribution chamber 150 is located at the top of the combustion furnace body 100. The gas distribution chamber 150 is provided with an air inlet 151, and the air inlet 151 is connected to the air supply system. An air partition 160 is provided between the gas distribution chamber 150 and the combustion chamber 110. A plurality of air jet nozzles 120 are installed on the air partition 160. The inlet ends of the plurality of air jet nozzles 120 are communicated with the gas distribution chamber 150, and the exhaust gas outlet 140 is arranged at the center of the air partition 160. The exhaust gas outlet 140 is connected with an exhaust gas diffusion pipe 170 extending vertically. The exhaust gas diffusion pipe 170 sequentially passes through the gas distribution chamber 150 and the furnace wall of the combustion furnace body 100 from the inside to the outside and extends out of the combustion furnace body 100. During use, air is transported to each air jet nozzle 120 through the gas distribution chamber 150, and the flue gas is discharged out through the exhaust gas diffusion pipe 170.

[0050] The combustion chamber 110 and the gas distribution chamber 150 of this embodiment both use the furnace wall as the wall surface and share the same furnace wall to achieve a simple structure for flameless combustion, reserve sufficient space for the outer inductive heating component 200, and at the same time can save manufacturing costs.

[0051] The gas distribution chamber 150 and the combustion chamber 110 of this embodiment are arranged vertically, which can make the layout simpler and the structure more compact. At the same time, the gas distribution chamber 150 can form a partition heat exchange relationship with the combustion chamber 110 through the air partition 160 to protect the furnace wall of the combustion chamber 110 and prevent overheating.

[0052] And at the end of the exhaust gas diffusion pipe 170 far from the combustion chamber 110, a plurality of exhaust gas diffusion ports 171 are circumferentially distributed to form back pressure at the exhaust gas diffusion ports 171 to limit the gas overflow from the combustion chamber 110 and increase the gas residence time inside the combustion chamber 110.

[0053] Further, as Figure 2 and 3As shown in the figure, an air distribution plate 152 is provided inside the air distribution chamber 150 of this embodiment. The air distribution plate 152 is designed with multiple pores. The air distribution plate 152 is located between the air inlet 151 and the inlet ends of multiple air jet nozzles 120 to form a uniform air flow after the air passes through the air distribution plate 152. The air distribution plate 152 of this embodiment has an annular plate structure. The inner ring of the air distribution plate 152 is sleeved on the outer periphery of the tail gas discharge pipe 170, and the outer periphery of the air distribution plate 152 is connected to the inner peripheral wall of the air distribution chamber 150.

[0054] Furthermore, the lower end of the tail gas discharge pipe 170 of this embodiment is communicated with the combustion chamber 110. The upper end of the tail gas discharge pipe 170 sequentially passes through the air partition plate 160, the air distribution plate 152 and the furnace wall. The tail gas discharge pipe 170 passes through the inside of the air distribution chamber 150 and forms a partition heat exchange relationship with the air distribution chamber 150, which can preheat the air and ensure the energy utilization rate.

[0055] During operation, air and ammonia fuel respectively enter the combustion chamber 110 through the air jet nozzles 120 and the fuel nozzles 130, and combine with the furnace wall to achieve a stable flow field for flameless combustion. The combustion tail gas is discharged from the tail gas discharge port 171 through the tail gas discharge pipe 170 to achieve the effect of tail gas discharge. Air enters the air distribution chamber 150 through the air inlet 151 and passes through the air distribution plate 152 in the air distribution chamber 150 again to achieve the uniform flow rate of air delivered to the air jet nozzles 120, thereby ensuring the same flow velocity of multiple air jet nozzles 120 in the combustion chamber 110.

[0056] 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 achieve an inductive heating reaction with the inductive coil 210.

[0057] As Figure 1 shown, the inductive heating component 200 of the present invention includes an inductive coil 210 spirally wound around the outer periphery of the combustion furnace body 100. The area surrounded by the inductive coil 210 corresponds to the combustion chamber 110. It can be understood that the inductive coil 210 is wound around the outer peripheral side of the combustion chamber 110.

[0058] The present invention heats the furnace wall of the combustion chamber 110, which is a metal component, through the inductive coil 210, so as to increase the temperature inside the combustion chamber 110, improve the cold start speed of the flameless combustion furnace, and at the same time make the temperature of the furnace wall of the combustion chamber 110 higher than the fuel spontaneous combustion temperature to achieve fuel ignition. It can avoid complex ignition designs inside the combustion, and during the operation process after the flameless combustion furnace is started, the heating function of the inductive coil 210 can also be involved in the flameless combustion to maintain the temperature inside the combustion chamber 110 within a set temperature range, avoid the phenomenon of fire, and improve the stability of the flameless combustion furnace during low-load operation.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] like Figure 4As 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] The temperature measurement module 230 of this embodiment is arranged to extend vertically along the furnace wall of the combustion chamber 110 and has a plurality of temperature detection sensors to meet the real-time monitoring of the furnace wall of the combustion chamber 110 and generate temperature information for feedback to the controller 240.

[0068] In some embodiments, the inductance coil 210 needs to have overheat protection. Since the temperature generated by combustion is too high, the high temperature will directly damage components such as the inductance coil 210. Therefore, it is necessary to cool it by certain means. Condensed water can be passed through the inside of the inductance coil 210, and the hollow inductance coil 210 material can be used; or a cooling medium can be added to the wall surface of the opposed-flow flameless combustion furnace so that the cooling medium flows through the furnace wall to cool it, which not only protects components such as the inductance coil 210 but also protects the furnace wall of the combustion chamber 110 from overheating.

[0069] In addition, the present invention also proposes a control method, which is applied to a rapid cold-start opposed-flow flameless combustion furnace, such as Figure 5 shown, and the control method includes:

[0070] Step S100: According to the cold-start condition of flameless combustion, energize and start the inductance coil 210 to heat the furnace wall of the combustion chamber 110 to the target temperature of flameless combustion.

[0071] Step S200: Inject air into the combustion chamber 110 through the air jet nozzle 120 and inject 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.

[0072] Step S300: Real-time detect the temperature information of the furnace wall of the combustion chamber 110.

[0073] Step S400: Control the start and stop of the inductance coil 210 according to the temperature information to keep the opposed-flow flameless combustion furnace performing stable opposed-flow flameless combustion.

[0074] In step S100, during cold start, the target temperature of flameless combustion is greater than the fuel auto-ignition temperature to achieve the ignition function.

[0075] In step S300, the temperature of the furnace wall is detected by the temperature measurement module 230.

[0076] In step S400, after the furnace wall of the combustion chamber 110 rises to the set temperature, the controller 240 will control to turn off the inductance coil 210 to achieve the control of the process after the opposed-flow flameless combustion furnace is started.

[0077] Furthermore, the control method further includes:

[0078] Step S500: Control the first stopper 221 and the second stopper 222 to move in the first direction, so as to drive the inductor coil 210 to expand and contract and move in the first direction, and control the inductor coil 210 to locally heat the furnace wall of the combustion chamber 110.

[0079] Through the linkage coupling control of the inductor coil 210 control, temperature monitoring, temperature information feedback and adjustment of the drive structure, the present invention realizes the effective control of the cold start process and the post-start process of the opposed jet flameless combustion furnace, and can meet the rapid cold start and continuous stable flameless combustion of the opposed jet flameless combustion furnace.

[0080] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0081] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

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; An induction heating assembly, comprising an induction coil spirally wound around the outer circumference of the combustion furnace body, wherein the area surrounded by the induction coil corresponds to the combustion chamber; At least one of the air jet nozzles and at least one of the fuel nozzles are arranged opposite to each other in a first direction and spaced apart from each other, and the inductor coil is spirally wound in the first direction; 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.

2. The rapid cold start flameless combustion furnace according to claim 1, 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.

3. The rapid cold start flameless combustion furnace according to claim 1, 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, and 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, and the first direction is arranged in the same direction as the center line of the combustion chamber.

4. The rapid cold start flameless combustion furnace according to claim 3, 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.

5. The rapid cold start flameless combustion furnace according to claim 4, 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.

6. The rapid cold start flameless combustion furnace according to claim 4, 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.

7. A control method, characterized in that: Applied to the rapid cold start flameless combustion furnace according to any one of claims 1 to 6, 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.

8. The control method according to claim 7, characterized in that: 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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