Novel commercial hearth

Abstract

The invention discloses a novel commercial hearth, and belongs to the technical field of gas combustors. According to the technical scheme, the novel commercial hearth comprises a hearth body, three annular airflow cavities are formed in the hearth body at intervals from inside to outside, two heat conduction rings are arranged between every two adjacent airflow cavities, heat exchange pipes are arranged in the heat conduction rings, the heat exchange pipes are provided with first heat release areas extending out of the heat conduction rings, and the first heat release areas are provided with second heat release areas extending out of the heat conduction rings. Three air guide pipes are arranged on the outer wall of the hearth body at intervals and connected into the three annular airflow cavities respectively, and each air guide pipe is provided with an electromagnetic valve. The combustion uniformity is improved through the multiple layers of annular airflow cavities and a hierarchical control strategy, the mixing efficiency is optimized through a gas mixing mechanism, the heat energy utilization rate is improved in combination with a multi-mode waste heat recovery system, and operation safety is guaranteed through real-time monitoring and dynamic adjustment; the system has the advantages of high combustion efficiency, excellent emission control, full heat energy recovery and timely safe response.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas burners, and particularly relates to a new type of commercial furnace. Background Art

[0002] As the core equipment of industrial thermal energy systems, the combustion efficiency and emission control of commercial furnaces directly affect energy consumption and environmental protection performance. The following technical bottlenecks generally exist in traditional furnace structures:

[0003] Problems of uneven combustion and excessive emissions are prominent. The current mainstream furnaces adopt a single-chamber air supply structure, and the combustion-supporting gas is input into the combustion area through a single annular chamber. This design leads to uneven air flow distribution, forming local high-temperature areas, which not only causes the generation amount of nitrogen oxides to exceed the standard, but also results in incomplete combustion and generates a large amount of carbon monoxide, which not only does not meet the environmental protection requirements but also has potential safety hazards.

[0004] The mixing efficiency of the gas premixing mechanism is low. The existing technology adopts a structural design of a simple diffuser chamber combined with a static mixer, which is difficult to achieve sufficient mixing of gases. Especially for high-viscosity fuels, the mixing time is too long, seriously affecting the combustion response speed. At the same time, the pressure fluctuation amplitude is large during the mixing process, which is prone to cause combustion instability.

[0005] There are energy utilization defects in the waste heat recovery system. In the traditional scheme, the water-to-water heat exchanger can only recover medium and low-temperature waste heat, and a large amount of high-temperature flue gas waste heat is directly discharged. The phase change heat storage unit operates independently of the combustion system, and it is impossible to achieve efficient collaborative utilization of thermal energy, resulting in low overall thermal efficiency of the system.

[0006] The safety control system has a lag in response. The existing monitoring scheme relies on a single parameter threshold judgment, and can only give a simple alarm when abnormal working conditions occur, lacking the ability to dynamically adjust the air flow distribution. The furnace body vibration detection adopts a mechanical structure, and it is difficult to detect and handle sudden deflagration risks in a timely manner. Summary of the Invention

[0007] The present invention provides a new type of commercial furnace to solve at least one of the above technical problems.

[0008] The technical solution adopted by the present invention is as follows:

[0009] A new type of commercial furnace includes a furnace body. Inside the furnace body, three annular air flow chambers are arranged at intervals from the inside to the outside. Two heat conduction rings are provided between adjacent air flow chambers. Heat exchange tubes are arranged inside the heat conduction rings. The heat exchange tubes have a first heat release area extending outside the heat conduction rings. Three air guide pipes are arranged at intervals on the outer wall of the furnace body. The three air guide pipes are respectively connected to the three annular air flow chambers. An electromagnetic valve is provided on each air guide pipe. It also includes a gas mixing mechanism. The three air guide pipes are all connected to the output end of the gas mixing mechanism. The gas mixing mechanism has a gas mixing tail section chamber. A second heat release area is arranged in parallel on the heat exchange tube through a valve member. The second heat release area is located inside the gas mixing tail section chamber. The gas mixing mechanism also includes a gas mixing middle section chamber and a gas mixing front section chamber. The two ends of the gas mixing middle section chamber are respectively connected to the gas mixing front section chamber and the gas mixing tail section chamber. The gas mixing middle section chamber has an air flow channel that first contracts and then expands. An air inlet pipe is arranged on the outer wall of the gas mixing middle section chamber. The air inlet pipe is connected to the place where the cross-section of the air flow channel is the smallest. A first flux detection unit and a control valve are arranged on the air inlet pipe. The inner wall of the gas mixing front section chamber is provided with swirl fins. A second flux detection unit is arranged inside the gas mixing front section chamber. It also includes a monitoring unit and a control unit for the CO / O2 concentration arranged on the furnace body. The control unit controls the opening and closing degree of the valve member according to the monitoring value of the monitoring unit, and / or the control unit adjusts the opening and closing degree of the control valve according to the monitoring values of the detection unit, the first flux detection unit, and the second flux detection unit.

[0010] Further, the present application also proposes that the section of the air flow channel of the gas mixing middle section chamber where the cross-section gradually becomes smaller is the contraction section. Swirl guiding vanes are arranged on the inner wall of the contraction section of the gas mixing middle section chamber.

[0011] Further, the present application also proposes that an annular flow equalizing plate is arranged on each annular air flow chamber. The annular flow equalizing plate adopts a honeycomb ceramic structure. The pore diameter of the honeycomb ceramic structure is 2 mm, and the porosity ≥ 80%.

[0012] Further, the present application also proposes that an annular limiting seat is arranged on the furnace body. An annular support is nested on the annular limiting seat. A pressure sensor is arranged between the annular limiting seat and the annular support. A gas control valve is arranged in the gas mixing front section chamber. The control unit controls the opening and closing degree of the gas control valve and the opening or closing of the three electromagnetic valves according to the detection value of the pressure sensor.

[0013] Further, the present application also proposes that during installation, a water storage pool is arranged around the furnace. The first heat release area is connected to the water storage pool to heat the washing water in the water storage pool.

[0014] Further, the present application also proposes that a first temperature sensor is arranged inside the gas mixing tail section chamber. A cooling component is arranged outside the gas mixing tail section chamber. When the temperature sensor detects a temperature higher than the threshold value, the control unit controls the cooling component to cool and protect the gas mixing tail section chamber.

[0015] Furthermore, the present application also proposes that the first heat release zone includes a first heat exchange tube located in a water reservoir, the second heat release zone includes a second heat exchange tube located inside the gas mixing tail section cavity, and also includes a phase change heat storage unit, a third heat exchange tube is provided inside the phase change heat storage unit, the valve member is a four-way valve, the first heat exchange tube, the second heat exchange tube, and the third heat exchange tube are connected in parallel with the heat exchange tube through a four-way solenoid valve, a second temperature sensor is provided in the water reservoir, and the control unit adjusts the four-way valve passage selection according to the water temperature of the water reservoir, the temperature of the gas mixing tail section cavity and the temperature of the phase change heat storage unit.

[0016] Furthermore, the present application also proposes that the solenoid valves on the three air ducts adopt a graded control mode: when the monitoring unit detects that the CO concentration in the furnace exceeds a first threshold value, the control unit closes the solenoid valve corresponding to the innermost annular airflow chamber; when the O2 concentration is lower than a second threshold value, the control unit synchronously increases the opening and closing degrees of the three solenoid valves; when the CO and O2 concentrations are both within a safe range, the control unit dynamically adjusts the opening and closing degrees of the solenoid valves according to the flow difference between the first flux detection unit and the second flux detection unit.

[0017] Furthermore, the present application also proposes that it also includes an alarm unit, and the pressure sensor is linked to the load-bearing state of the annular support: when the pressure sensor detection value is continuously lower than the load threshold, the control unit closes the gas control valve and cuts off the gas supply path of the three solenoid valves; when the pressure sensor detection value fluctuates by more than ±20% within a preset time, the control unit reduces the opening degree of the gas control valve to 50% and triggers the alarm unit.

[0018] Furthermore, the present application also proposes that the path selection logic of the four-way solenoid valve includes: when the second temperature sensor of the water reservoir is less than 20°C, the four-way valve is connected to the first heat exchange tube; when the temperature of the gas mixing tail section cavity is less than 150°C, the four-way valve is forced to connect to the second heat exchange tube, and the second heat exchange tube introduces heat into the gas mixing tail section cavity, and performs waste heat and mixing on the mixed gas entering the gas mixing tail section cavity; when the temperature of the phase change heat storage unit reaches the phase change critical point and the water reservoir temperature is ≥60°C, the four-way valve switches to the third heat exchange tube.

[0019] Due to the adoption of the above technical solution, the beneficial effects achieved by the present invention are as follows:

[0020] 1. This scheme uses the self-excited oscillation effect generated by the variable diameter flow channel to improve the mixing efficiency and reduce the flow resistance loss; the ordinary waste heat recovery device adopts a fixed heat exchange path, and this scheme realizes the dynamic distribution of heat between the external heat sink and the gas preheating through the parallel heat release zone design; the existing safety control strategy adopts independent parameter threshold judgment, and this scheme establishes a multi-sensor data fusion model to realize the linkage control of gas supply, mixing ratio and heat recovery mode.

[0021] Through the above technical solutions, the present application achieves precise regulation of the oxygen concentration in the combustion zone, effectively suppressing the generation of nitrogen oxides and incomplete combustion; improving the gas mixing uniformity and stability, and shortening the combustion preparation time; optimizing the selection of waste heat utilization paths, and enhancing the overall energy efficiency of the system; establishing a multi-dimensional safety control mechanism to quickly respond to abnormal changes in the combustion state. This technical solution is particularly applicable to commercial cooking scenarios that require precise temperature control and rapid load adjustment, while maintaining high thermal efficiency and ensuring that the emission indicators meet environmental protection requirements.

[0022] 2. By arranging swirl guide vanes on the inner wall of the contraction section, the high kinetic energy state during the air flow acceleration stage is utilized to strengthen the turbulence intensity, enabling the mixing process to be completed within a shorter flow path length, while avoiding pressure pulsations caused by sudden changes in flow velocity.

[0023] Through the above technical solutions, the present application effectively solves the problem of insufficient mixing of high-viscosity fuel gas and combustion-supporting gas, increasing the mixing uniformity to above the critical threshold required for the combustion reaction, shortening the gas mixing response time and suppressing combustion oscillation phenomena, providing a basic condition for stable flame propagation in the subsequent combustion zone.

[0024] 3. This solution adopts a honeycomb ceramic structure, and its regular pore distribution can achieve precise flow distribution. The high-temperature resistance performance of the ceramic material is superior to that of metal materials, and it maintains structural stability in a long-term high-temperature environment.

[0025] Through the above technical solutions, the present application achieves uniform distribution of the air flow across the cross-section of the annular chamber, eliminating local high-temperature regions caused by uneven air flow distribution in the traditional structure. The high porosity of the honeycomb ceramic provides sufficient contact space for air flow mixing, and its heat storage characteristics contribute to stabilizing the air flow temperature field. The regular pore structure avoids the problem of sudden changes in flow resistance existing in traditional random porous media, ensuring balanced gas supply to each annular chamber.

[0026] 4. This solution uses the nested structure of the annular limit seat and the support in combination with a pressure sensor to detect pressure abnormalities within 0.5 seconds and synchronously adjust the flow rates of the fuel gas and combustion-supporting gas, avoiding the risk of deflagration caused by mechanical displacement lag. In the prior art, the fuel gas control is not related to the state of the support, while this solution directly links the pressure change of the support to the gas supply system to form a closed-loop control system.

[0027] Through the above technical solutions, when abnormal vibration or sudden load change occurs in the furnace body, the present application can quickly cut off the gas supply and adjust the air flow distribution through the real-time detection of the pressure sensor, effectively preventing furnace body cracking or deflagration accidents caused by mechanical stress concentration. The cooperative design of the annular support and the limit seat can achieve the autonomous compensation of the thermal expansion of the furnace body, avoiding equipment damage caused by the accumulation of thermal stress in the traditional rigid connection structure. The linkage control mechanism of the pressure sensor with the gas control valve and the solenoid valve solves the technical defect that the traditional system cannot actively adjust the combustion state with a single parameter threshold alarm, significantly improving the operation safety of the equipment.

[0028] 5. This solution directly places the first heat release area at the water-using terminal, which not only avoids the problem of energy grade mismatch in the traditional solution, but also improves the heat conduction efficiency through the physical contact heat exchange method. In addition, as a ready-made heat carrier, the reservoir saves the construction and maintenance costs of an independent heat storage device.

[0029] Through the above technical solutions, the present application realizes the direct utilization of high-temperature waste heat, solving the problem of energy loss caused by the separation of the heat source and the heat-using terminal in the traditional system. The washing water can directly obtain the waste heat generated during the operation of the furnace without waiting for the heat release process of the heat storage unit, significantly shortening the hot water preparation time. At the same time, the reservoir has the dual functions of water storage and heat exchange, simplifying the system structure and reducing the equipment investment cost.

[0030] 6. Through the linkage control of the temperature sensor and the cooling component, when abnormal temperature is detected, the physical cooling action is immediately executed, solving the problems of shortened equipment life and deteriorated emissions caused by local overheating of the mixed gas. Compared with the lagging processing method relying on manual intervention in the prior art, this solution realizes the real-time closed-loop control of the abnormal temperature in the mixing chamber.

[0031] Through the above technical solutions, the present application effectively prevents the risk of material deformation and seal failure in the gas mixing tail section chamber caused by high temperature, ensuring the thermodynamic stability of the mixed gas. Under the conditions of gas composition fluctuation or sudden load change, it can quickly eliminate the temperature spike in the mixing chamber, avoiding deflagration or a sharp increase in nitrogen oxide generation of the burner due to too high intake air temperature. At the same time, the active temperature control extends the service life of the mixing mechanism and reduces the maintenance frequency caused by high-temperature corrosion.

[0032] 7. This solution integrates the functions of heating the reservoir, preheating the gas and heat storage in the same heat exchange network through a multi-path switching structure, solving the problems of low thermal energy utilization rate and late heat storage response in the traditional system.

[0033] Through the above technical solution, the present application realizes the multi-stage and hierarchical utilization of combustion waste heat, preferentially meets the water use demand when the water storage tank needs to be heated, automatically supplements the preheating energy when the temperature of the mixed gas is insufficient, and stores the excess heat energy for standby when the system generates excessive heat. This dynamic adjustment mechanism effectively avoids the energy waste caused by the mismatch of heat energy grades in the traditional solution, and at the same time shortens the response time of the heat storage unit.

[0034] 8. This solution realizes the refined adjustment of the combustion state by establishing a hierarchical control logic with multi-parameter linkage. In the prior art, the solenoid valve only has two states of opening or closing. This solution introduces a dynamic adjustment mechanism, which can continuously adjust the gas supply volume according to the actual combustion demand.

[0035] Through the above technical solution, the present application effectively solves the technical contradictions of excessive carbon monoxide concentration and insufficient oxygen supply during the combustion process, optimizes the fuel utilization rate while ensuring the combustion safety. This method significantly improves the combustion stability through a real-time feedback adjustment mechanism, avoids the adjustment lag problem existing in the traditional control method, and at the same time reduces the frequency of manual intervention.

[0036] 9. Through the real-time linkage of the pressure signal and the gas supply, the energy supply can be cut off at the initial stage of structural instability, and the safety hazard disposal node is advanced to before the accident occurs. For the detection of pressure fluctuations, the prior art relies on manual inspection to record vibration data. This solution realizes millisecond-level dynamic response and automatic intervention.

[0037] Through the above technical solution, the present application can quickly cut off the gas supply and trigger a warning when the furnace support structure has abnormal deformation or sudden vibration, effectively preventing gas leakage or deflagration accidents caused by mechanical failure. The closed-loop control mechanism of the pressure data and the gas supply system solves the problem of response lag in the traditional safety system, and at the same time provides accurate fault location information for equipment maintenance.

[0038] 10. This solution realizes the on-demand distribution of heat energy by constructing a multi-path switching architecture, which not only ensures the supply of basic heat load, but also can implement directional heating for key process links, and at the same time takes into account the energy storage requirements, forming a trinity heat management strategy.

[0039] Through the above technical solution, the present application effectively solves the problem of rigid heat flow distribution in the traditional waste heat recovery system, and realizes the cascaded utilization of heat energy with different grades. By intelligently switching the heat exchange path, on the premise of ensuring the basic heating demand of washing water, it preferentially meets the process temperature requirements of the gas mixing chamber, and timely stores the excess heat for standby, significantly improving the comprehensive utilization efficiency of heat energy. At the same time, it avoids the risk of equipment overheating caused by excessive heat accumulation under high-temperature conditions, and ensures the safe and stable operation of the system. Brief Description of the Drawings

[0040] Figure 1 One of the schematic structural diagrams of the specific embodiment of the present invention;

[0041] Figure 2 Two of the schematic structural diagrams of the specific embodiment of the present invention;

[0042] Figure 3 Three of the schematic structural diagrams of the specific embodiment of the present invention;

[0043] Figure 4 Schematic diagram of the principle of furnace waste heat recovery in the specific embodiment of the present invention.

[0044] The accompanying drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation to the present invention.

[0045] In the drawings:

[0046] 1. Furnace body; 11. Annular limiting seat; 12. Annular support; 2. Annular air flow chamber; 21. Heat conduction ring; 22. Annular flow equalizing plate; 23. Air guide pipe; 231. Solenoid valve; 3. Heat exchange pipe; 31. Four-way valve; 32. First heat exchange pipe; 33. Second heat exchange pipe; 34. Third heat exchange pipe; 4. Gas mixing mechanism; 41. Front-stage gas mixing chamber; 42. Middle-stage gas mixing chamber; 421. Air inlet pipe; 43. Rear-stage gas mixing chamber; 5. Monitoring unit; 6. Water storage tank; 7. Phase change heat storage unit. Specific embodiment

[0047] In order to more clearly explain the overall concept of the present invention, the following will be described in detail by way of examples in conjunction with the accompanying drawings of the specification.

[0048] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0049] In addition, in the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and 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 cannot be construed as a limitation to the present invention.

[0050] In the present invention, unless otherwise clearly defined or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise clearly defined or limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to terms such as "embodiment", "example", "an embodiment", "example", or "specific example" 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.

[0052] Those skilled in the art can understand that the combustion efficiency and emission control of commercial furnaces have long faced technical bottlenecks. The traditional single-chamber air supply structure leads to uneven air flow distribution, forming local high-temperature areas, which causes problems such as excessive nitrogen oxides and incomplete combustion; the gas premixing mechanism has insufficient mixing uniformity, resulting in combustion response delay and pressure fluctuations; the waste heat recovery system cannot achieve coordinated utilization of multi-grade heat energy, and the heat of high-temperature flue gas is directly discharged; the safety monitoring system relies on single-parameter threshold control, making it difficult to dynamically adjust the air flow distribution and eliminate safety hazards in a timely manner. In the central kitchen scenario of large catering places, continuous high-intensity cooking operations require the furnace to have stable combustion performance and rapid heat response capabilities. However, existing equipment often causes food ingredients to be burnt or combustion to be interrupted due to local overheating, affecting the meal preparation efficiency and safety standards.

[0053] To address the above problems, the inventors observed that the insufficient combustion uniformity stems from the simplification of the gas delivery path, and it is necessary to establish a multi-stage air flow distribution channel to optimize the oxygen diffusion process; the low mixing efficiency and pressure fluctuations are related to the insufficient turbulence intensity during the gas acceleration stage, and it is necessary to reconstruct the flow channel shape to enhance shear mixing; the rigid waste heat recovery is manifested by the single heat energy utilization mode, and it is necessary to build a multi-path heat exchange network to achieve on-demand heat distribution; the lag in safety control exposes the lack of correlation of existing system parameters, and it is necessary to establish a multi-sensor feedback mechanism to achieve real-time regulation of the combustion state. Based on this, the research and development direction focuses on reconstructing the combustion field distribution through a hierarchical air flow chamber, improving the gas mixing efficiency by combining a variable cross-section mixing chamber, and introducing a multi-mode heat exchange path and intelligent control logic to achieve system collaborative optimization.

[0054] Referring to Figures 1-4 , this application proposes a new commercial furnace including a furnace body 1. Three annular air flow chambers 2 are arranged at intervals inside the furnace body 1. A heat conduction ring 21 structure with heat exchange tubes 3 is configured between adjacent chambers, and the heat exchange tubes 3 extend to form an external heat release area. Three gas pipes 23 are respectively connected to each air flow chamber and are equipped with electromagnetic valves 231. The gas mixing mechanism 4 includes a front section, a middle section, and a tail section mixing chamber connected in series. The middle section mixing chamber is designed as a converging-diverging flow channel and an intake pipe 421 with a control valve is arranged at the minimum cross-section. The monitoring unit 5 detects the combustion gas components in real time, and the control unit adjusts the opening degree of the valve components and the gas mixing parameters according to the monitoring data.

[0055] Among them, the annular air flow chamber 2 refers to a ring-shaped gas channel arranged in layers along the radial direction of the furnace. Specifically, it can be realized by a concentric cylinder structure with spaced support members, and a gradient oxygen concentration distribution is formed by layered gas supply. The heat conduction ring 21 refers to an annular heat conduction component arranged between the air flow chambers. Specifically, it can be realized by embedding a spiral coil in a copper-aluminum alloy ring body, which is used to conduct heat between the chambers and support the heat exchange tube 3 path. The converging-diverging flow channel of the middle section of the gas mixing chamber 42 refers to a variable-diameter pipe with a cross-section that first decreases and then increases. Specifically, it can be realized by a Venturi tube structure with guiding ribs, and a pressure difference is generated through the change in flow velocity to promote gas mixing. The second heat release area refers to the extended part of the heat exchange tube 3 in the tail section mixing chamber. Specifically, it can be realized by a finned tube structure penetrating the wall of the mixing chamber, and the waste heat is introduced into the mixed gas for preheating. The multi-parameter regulation logic of the control unit refers to the processing algorithm that integrates combustion state monitoring and flow detection data. Specifically, it can be realized by a PLC controller with a PID adjustment module, and the opening degree of each valve is dynamically optimized to maintain the best combustion conditions.

[0056] Specifically, the combustion-supporting gas generates initial turbulence through the swirl fins in the front-stage mixing cavity. When it enters the contraction section of the middle-stage cavity, the flow velocity increases, and intense shear mixing occurs with the secondary gas injected by the intake pipe 421 at the minimum cross-section. The decreasing flow velocity in the expansion section promotes the full diffusion of the gas. The mixed gas absorbs the heat transferred from the second heat release area when passing through the tail-stage cavity to complete preheating. The three gas guide pipes 23 deliver gases with different proportions to the corresponding gas flow chambers according to the control instructions, forming an oxygen concentration gradient that decreases from the inside to the outside. The heat exchange pipe 3 releases heat to the external heat sink through the first heat release area, and at the same time, the second heat release area participates in the preheating of the mixed gas by switching the valve components. The monitoring unit 5 real-time feeds back the gas composition in the combustion area. After comparing with the preset threshold, the control unit adjusts the opening degree of the solenoid valve 231 to change the gas supply volume of each chamber. When abnormal components are detected, the opening and closing degrees of the control valves of the mixing mechanism are synchronously adjusted to achieve the coordinated optimization of the gas supply parameters and the mixing conditions.

[0057] This solution constructs an adjustable gradient oxygen environment through three-stage gas flow chambers, effectively suppressing the formation of local high-temperature areas; conventional static mixers rely on mechanical turbulence elements, while this solution utilizes the self-excited oscillation effect generated by variable flow channels to improve the mixing efficiency and reduce the flow resistance loss; ordinary waste heat recovery devices adopt fixed heat exchange paths, and this solution realizes the dynamic distribution of heat between the external heat sink and gas preheating through the parallel heat release area design; existing safety control strategies use independent parameter threshold judgments, and this solution establishes a multi-sensor data fusion model to achieve the linkage control of the gas supply volume, mixing ratio, and heat recovery mode.

[0058] Through the above technical solutions, this application realizes the precise regulation of the oxygen concentration in the combustion area, effectively suppressing the generation of nitrogen oxides and incomplete combustion phenomena; improving the gas mixing uniformity and stability, shortening the combustion preparation time; optimizing the waste heat utilization path selection, improving the overall energy efficiency of the system; establishing a multi-dimensional safety control mechanism to quickly respond to abnormal changes in the combustion state. This technical solution is particularly suitable for commercial cooking scenarios that require precise temperature control and rapid load adjustment, ensuring that the emission indicators meet the environmental protection requirements while maintaining high thermal efficiency.

[0059] As a preferred implementation manner of the gas mixing mechanism 4, this application further proposes that the inner wall of the contraction section of the gas mixing middle-stage cavity 42 is provided with swirl guiding vanes.

[0060] Among them, the swirl guiding vanes refer to the blade structures installed on the inner wall of the contraction section, which can be specifically realized by using metal guide plates with a preset helix angle to generate rotational shear force by changing the air flow movement trajectory. Among them, the contraction section refers to the section where the cross-sectional area of the gas flow channel in the gas mixing middle-stage cavity 42 gradually decreases, which can be specifically realized by a variable-diameter pipe section, and the air flow is accelerated by using the cross-sectional contraction.

[0061] Specifically, when the mixed gas flows through the contraction section, the swirl guide vanes form high-intensity turbulence during the acceleration process by guiding the air flow along a spiral path. The fuel gas and the combustion-supporting gas generate a multi-scale eddy structure under the condition of high-speed rotation, promoting the molecular-level diffusion and mixing of different component gases at the microscopic level. During this process, the geometric parameters of the swirl guide vanes can be optimized according to the physical property parameters of the gas. For example, an involute blade profile can be adopted to balance the pressure drop and the mixing efficiency.

[0062] Compared with the prior art, when a static mixer is arranged in the diffuser chamber of the traditional gas mixing device, only the fluid inertia is relied on to achieve preliminary mixing, and the mixing uniformity is limited by the laminar flow state after the flow velocity decays. In this solution, by arranging the swirl guide vanes on the inner wall of the contraction section, the high kinetic energy state during the air flow acceleration stage is utilized to strengthen the turbulence intensity, enabling the mixing process to be completed within a shorter flow path length, and at the same time avoiding the pressure pulsation caused by the sudden change of the flow velocity.

[0063] Through the above technical solution, this application effectively solves the problem of insufficient mixing of high-viscosity fuel gas and combustion-supporting gas, improves the mixing uniformity to above the critical threshold required for the combustion reaction, shortens the gas mixing response time and suppresses the combustion oscillation phenomenon, providing a basic condition for the stable flame propagation in the subsequent combustion zone.

[0064] As a preferred example of the furnace body 1, this application further proposes to arrange an annular flow equalizing plate 22 on each annular air flow chamber 2. The annular flow equalizing plate 22 adopts a honeycomb ceramic structure, the pore diameter of the honeycomb ceramic structure is 2 mm, and the porosity ≥ 80%.

[0065] Among them, the annular flow equalizing plate 22 refers to a porous flow guiding structure installed in the air flow channel, which can be specifically realized by processing an annular porous structure on a sintered ceramic plate, and its annular contour matches the cross-sectional shape of the air flow chamber. The honeycomb ceramic structure refers to a porous medium composed of regularly arranged through channels, and specifically, a ceramic matrix with hexagonal channels can be prepared by an extrusion molding process, and the arrangement direction of the channels is parallel to the air flow direction. The pore diameter of 2 mm refers to the equivalent diameter of a single channel, and specifically, the pore diameter accuracy can be controlled by adjusting the size of the die core pin. The porosity ≥ 80% means that the proportion of the solid part of the honeycomb ceramic in the overall volume does not exceed 20%, and specifically, it can be realized by optimizing the ratio of the channel density to the wall thickness.

[0066] Specifically, when installing the flow equalizing plate with a honeycomb ceramic structure in the annular air flow chamber 2, the combustion-supporting gas flows through the honeycomb channels and is divided into multiple thin streams. The parallel flow channels formed by the regular arrangement of the honeycomb channels guide the air flow to uniformly diffuse along the axial direction, avoiding the generation of local eddies. The high porosity ensures that the air flow resistance is controlled within a reasonable range, avoiding excessive pressure loss. The heat storage characteristic of the honeycomb ceramic can homogenize the air flow temperature and reduce the thermal fluctuation.

[0067] This solution uses a honeycomb ceramic structure. Its regular pore distribution can achieve precise flow distribution. The high-temperature resistance of ceramic materials is better than that of metal materials, and it can maintain structural stability in a long-term high-temperature environment.

[0068] Through the above technical solution, the present application realizes the uniform distribution of air flow in the cross-section of the annular chamber, eliminating the local high-temperature area caused by uneven air flow distribution in the traditional structure. The high porosity of the honeycomb ceramic provides sufficient contact space for air flow mixing, and its heat storage characteristics contribute to stabilizing the air flow temperature field. The regular pore structure avoids the problem of sudden change in flow resistance existing in traditional random porous media, ensuring the balanced air supply in each annular chamber.

[0069] As a preferred implementation manner of the present application, referring to Figure 1 , the present application further proposes an improved solution for a commercial furnace structure, including an annular limit seat 11 arranged on the furnace body 1, an annular support 12 nested on the annular limit seat 11, a pressure sensor arranged between the annular limit seat 11 and the annular support 12, a gas control valve arranged at the front section chamber 41 of gas mixing, and the control unit controls the opening degree of the gas control valve and the opening or closing of three solenoid valves 231 according to the detection value of the pressure sensor.

[0070] Among them, the annular limit seat 11 refers to an annular support structure installed on the outer periphery of the furnace body 1, which can be specifically formed by casting stainless steel or high-temperature resistant alloy, and is used to carry and fix the annular support 12. The annular support 12 refers to a movable component nested on the annular limit seat 11, which can be specifically designed as a split buckle structure, allowing a small axial displacement. The pressure sensor refers to a mechanical detection device arranged between the annular limit seat 11 and the annular support 12, which can be specifically a piezoelectric sensor or a strain gauge sensor, and is used to monitor the pressure change between the furnace body 1 and the support in real time. The gas control valve refers to a flow regulating device installed at the inlet of the front section chamber 41 of gas mixing, which can be specifically a proportional solenoid valve 231 or an electric butterfly valve, and adjusts the combustion intensity by controlling the gas supply amount.

[0071] Specifically, when the pressure between the annular support 12 and the limit seat fluctuates due to thermal expansion of the furnace body 1 or external load change, the pressure sensor transmits the detected pressure signal to the control unit. The control unit, according to the preset pressure threshold range, for example, when the detection value is lower than the lower limit of the load, determines that the furnace body support is abnormal and immediately closes the gas control valve, and at the same time cuts off the gas supply path of the solenoid valves 231 of the three air ducts 23; when the fluctuation amplitude of the detection value exceeds the allowable range within the set time, the control unit synchronously reduces the opening degree of the gas control valve to the preset safety value, for example, adjusts the opening degree to 50%, and triggers the closing action of the solenoid valve 231. The nested design of the annular support 12 allows it to produce a small amount of displacement when the pressure changes, and realizes the rapid response of the combustion system through the dynamic detection of the pressure sensor.

[0072] Through the nested structure of the annular limit seat 11 and the support and the cooperation with the pressure sensor, this solution can detect abnormal pressure within 0.5 seconds and synchronously adjust the flow rates of fuel gas and combustion-supporting gas, avoiding the deflagration risk caused by mechanical displacement lag. In the prior art, the fuel gas control has no association with the state of the support, while in this solution, the pressure change of the support is directly linked to the gas supply system to form a closed-loop control system.

[0073] Through the above technical solution, when abnormal vibration or load mutation occurs in the furnace body 1, this application can quickly cut off the fuel gas supply and adjust the air flow distribution through the real-time detection of the pressure sensor, effectively preventing furnace body cracking or deflagration accidents caused by mechanical stress concentration. The combined design of the annular support 12 and the limit seat can achieve autonomous compensation for the thermal expansion of the furnace body, avoiding equipment damage caused by the accumulation of thermal stress in the traditional rigid connection structure. The linkage control mechanism of the pressure sensor with the fuel gas control valve and the solenoid valve 231 solves the technical defect that the traditional system cannot actively adjust the combustion state with a single parameter threshold alarm, significantly improving the operation safety of the equipment.

[0074] As another preferred embodiment of this application, this application further proposes to set a reservoir 6 around the furnace during installation, and the first heat release area is connected to the reservoir 6 to heat the washing water in the reservoir 6.

[0075] Among them, the reservoir 6 refers to a water storage container for storing industrial washing water, which can be specifically realized by concrete pouring or steel structure welding, and its volume can be adjusted according to the water consumption demand. The first heat release area refers to the heat energy release section where the heat exchange tube 3 extends outward, which can be specifically realized by a stainless steel corrugated pipe or a copper coil pipe, and transfers the waste heat of the furnace to the water body of the reservoir 6 through heat conduction.

[0076] Specifically, the waste heat generated during the operation of the furnace is conducted to the first heat release area through the heat exchange tube 3 in the heat conduction ring 21. When hot water supply is required for washing operations, the control unit opens the valve component to allow the high-temperature medium to flow through the first heat release area. At this time, the first heat release area immersed in the reservoir 6 contacts the water body through the pipe wall, directly transferring the heat energy to the washing water. The washing water forms natural convection in the reservoir 6 to achieve uniform heating.

[0077] Compared with the prior art, the traditional waste heat recovery system only recovers medium and low-temperature heat through an independent water-to-water heat exchanger, and the waste heat of high-temperature flue gas is not effectively utilized. This solution directly places the first heat release area at the water-using terminal, which not only avoids the problem of energy grade mismatch in the traditional solution but also improves the heat conduction efficiency through physical contact heat exchange. In addition, as a ready-made heat carrier, the reservoir 6 eliminates the construction and maintenance costs of an independent heat storage device.

[0078] Through the above technical solutions, the present application realizes the direct utilization of high-temperature waste heat and solves the problem of energy loss caused by the separation of the heat source and the heat-using terminal in the traditional system. The washing water can obtain the waste heat generated by the furnace operation in real time without waiting for the heat release process of the heat storage unit, significantly shortening the hot water preparation time. At the same time, the water storage tank 6 has both the functions of water storage and heat exchange, simplifying the system structure and reducing the equipment investment cost.

[0079] The present application further proposes to provide a first temperature sensor in the gas mixing tail section cavity 43 and a cooling component outside the gas mixing tail section cavity 43. When the temperature sensor detects a temperature higher than the threshold value, the control unit controls the cooling component to cool and protect the gas mixing tail section cavity 43.

[0080] Among them, the first temperature sensor refers to a detection device for real-time monitoring of the internal temperature change of the gas mixing tail section cavity 43. Specifically, it can be implemented by a thermocouple or a thermal resistance sensor. It is arranged on the inner wall or the air flow channel of the gas mixing tail section cavity 43 to capture the real-time temperature data of the mixed gas. The cooling component refers to an external device for actively dissipating heat from the gas mixing tail section cavity 43. Specifically, it can be implemented by a cooling water circulation system or an air-cooled radiator. Its installation position is in thermal conduction contact with the outer wall of the gas mixing tail section cavity 43, and the cavity temperature is reduced by forced convection or phase change heat absorption. The control unit refers to a control module that performs a cooling operation according to the signal of the temperature sensor. Specifically, it can be implemented by a programmable logic controller or an embedded microprocessor. It has a built-in temperature threshold comparison algorithm and triggers the start instruction of the cooling component when the detected temperature exceeds the preset safety value.

[0081] Specifically, during the gas mixing process, the gas-air mixture in the mixing tail section cavity may generate instantaneous high temperature due to intense reaction. The first temperature sensor continuously collects the internal temperature data of the cavity and transmits it to the control unit. When the monitored temperature exceeds the preset threshold value, the control unit immediately sends a start signal to the cooling component. The cooling component quickly reduces the temperature of the outer wall of the mixing tail section cavity through the circulation of the cooling medium or forced heat dissipation, forming a heat conduction path from the outside to the inside, thereby suppressing the further increase of the temperature of the mixed gas. This process completes the temperature regulation before the mixed gas enters the furnace for combustion, avoiding the direct entry of high-temperature gas into the combustion zone, which may cause overheating damage to the equipment or excessive emissions.

[0082] Through the interlocking control of the temperature sensor and the cooling component, this solution immediately performs a physical cooling action when an abnormal temperature is detected, solving the problems of shortened equipment life and deteriorated emissions caused by local overheating of the mixed gas. Compared with the lagging processing method relying on manual intervention in the prior art, this solution realizes the real-time closed-loop control of the abnormal temperature in the mixing cavity.

[0083] Through the above technical solution, the present application effectively prevents the risk of material deformation and seal failure caused by high temperature in the gas mixing tail section cavity 43, and ensures the thermodynamic stability of the mixed gas. Under the conditions of fluctuating gas components or sudden load changes, it can quickly eliminate the temperature spike in the mixing cavity, avoiding deflagration of the burner due to too high intake air temperature or a sharp increase in the generation amount of nitrogen oxides. At the same time, the active temperature control extends the service life of the mixing mechanism and reduces the maintenance frequency caused by high temperature corrosion.

[0084] Referring to Figure 1 and Figure 4 , the present application further proposes a heat exchange system for a commercial furnace, including a first heat exchange tube 32 located in the reservoir 6, a second heat exchange tube 33 located inside the gas mixing tail section cavity 43, and a phase change heat storage unit 7 including a third heat exchange tube 34. A four-way valve 31 connects the first heat exchange tube 32, the second heat exchange tube 33, and the third heat exchange tube 34 in parallel with the heat exchange tube 3. A second temperature sensor is provided in the reservoir 6, and the control unit regulates the path selection of the four-way valve 31 according to the water temperature of the reservoir 6, the temperature of the gas mixing tail section cavity 43, and the temperature of the phase change heat storage unit 7.

[0085] Among them, the four-way valve 31 refers to a fluid control device with four connection ports, which can be specifically implemented by an electromagnetic drive type four-way reversing valve, and the connection state between different pipelines is switched through an electrical signal. The phase change heat storage unit 7 refers to a device that stores thermal energy using the latent heat of phase change materials, which can be specifically implemented by a storage tank structure encapsulating paraffin or molten salt, and a third heat exchange tube 34 is arranged inside to achieve heat exchange. The second temperature sensor refers to a temperature measuring element for detecting the water temperature of the reservoir 6, which can be specifically implemented by a platinum resistance temperature sensor or a thermocouple, and transmits the temperature signal to the control unit through a cable.

[0086] Specifically, when the water temperature of the reservoir 6 is lower than the set value, the control unit drives the four-way valve 31 to connect the first heat exchange tube 32, so that the high-temperature medium in the heat exchange tube 3 preferentially heats the reservoir 6; when the temperature of the gas mixing tail section cavity 43 is lower than the operating requirement, the four-way valve 31 switches to the second heat exchange tube 33 to introduce the waste heat into the mixed gas for preheating; when the temperature of the phase change heat storage unit 7 reaches the critical point of the phase change material and the water temperature of the reservoir 6 has met the usage requirements, the four-way valve 31 switches to the third heat exchange tube 34 to store the excess heat in the phase change materials. This dynamic adjustment process realizes the intelligent switching of the heat energy distribution path by real-time monitoring the temperature parameters of three key regions.

[0087] This solution integrates the functions of heating the reservoir 6, preheating the gas, and heat storage in the same heat exchange network through a multi-path switching structure, solving the problems of low heat energy utilization rate and delayed heat storage response in traditional systems.

[0088] Through the above technical solutions, the present application realizes the multi-level and step-by-step utilization of combustion waste heat, preferentially meets the water demand when the water storage tank 6 needs to be heated, automatically supplements preheating energy when the temperature of the mixed gas is insufficient, and stores the excess heat energy for standby when the system generates excess heat. This dynamic adjustment mechanism effectively avoids the energy waste caused by the mismatch of heat energy grades in the traditional solution, and at the same time shortens the response time of the heat storage unit.

[0089] The present application further proposes a control method for the solenoid valve 231 of a commercial furnace. The solenoid valves 231 on the three gas pipes 23 adopt a hierarchical control mode: when the monitoring unit 5 detects that the CO concentration in the furnace exceeds the first threshold, the control unit closes the solenoid valve 231 corresponding to the innermost annular air flow chamber 2; when the O2 concentration is lower than the second threshold, the control unit synchronously increases the opening degrees of the three solenoid valves 231; when the CO and O2 concentrations are both within the safe range, the control unit dynamically adjusts the opening degree of the solenoid valve 231 according to the flow difference between the first flux detection unit and the second flux detection unit.

[0090] Among them, the hierarchical control mode refers to implementing different solenoid valve 231 operation strategies according to different gas concentration conditions, which can be specifically realized by using a PLC controller in cooperation with multi-channel PWM signal output. This mode can precisely intervene in abnormal combustion states. Among them, the first threshold refers to the safety critical value of carbon monoxide concentration, which can be specifically obtained by calibration through combustion experiments. When exceeding this value, it indicates that there is an oxygen-deficient condition in the combustion zone. Among them, the second threshold refers to the minimum demand value for maintaining complete combustion of oxygen concentration, which can be specifically calculated according to the fuel calorific value. When the oxygen concentration is lower than this value, the supply of combustion-supporting gas needs to be increased. Among them, the safe range refers to the working condition interval where the carbon monoxide concentration is lower than the first threshold and the oxygen concentration is higher than the second threshold. Within this interval, the system maintains a stable combustion state. Among them, the dynamic adjustment of the flow difference refers to adjusting the opening degree of the solenoid valve 231 in real time according to the change of the difference between the inlet flow and the outlet flow of the mixing chamber, which can be specifically realized by using a PID control algorithm to balance the gas distribution ratio of each chamber.

[0091] Specifically, when the carbon monoxide concentration in the furnace exceeds the standard, the solenoid valve 231 of the innermost air flow chamber is immediately closed to cut off the gas supply in this area to eliminate local oxygen-deficient combustion; when the oxygen concentration is insufficient, the opening degrees of the three solenoid valves 231 are synchronously increased to increase the overall gas supply; under normal combustion conditions, by comparing the flow difference between the inlet and outlet of the mixing chamber in real time, the opening degree of each solenoid valve 231 is automatically adjusted to maintain the best air-fuel ratio.

[0092] Through the above technical solution, the present application effectively solves the technical contradiction of excessive carbon monoxide concentration and insufficient oxygen supply during the combustion process, and optimizes the fuel utilization rate while ensuring the combustion safety. This method significantly improves the combustion stability through a real-time feedback adjustment mechanism, avoids the adjustment lag problem existing in the traditional control method, and reduces the frequency of manual intervention at the same time.

[0093] The present application further proposes that it also includes an alarm unit. The pressure sensor is linked with the load-bearing state of the annular support 12. When the detection value of the pressure sensor continuously falls below the load threshold, the control unit closes the gas control valve and cuts off the gas supply paths of the three solenoid valves 231. When the detection value of the pressure sensor fluctuates by more than ±20% within a preset time, the control unit reduces the opening degree of the gas control valve to 50% and triggers the alarm unit.

[0094] Among them, the linkage between the pressure sensor and the load-bearing state of the annular support 12 means the coordination relationship between the mechanical structure and the electrical signal conversion. Specifically, a piezoresistive sensor can be nested at the contact surface between the annular limit seat 11 and the support to achieve real-time monitoring of the stress state of the furnace body support structure. Among them, the load threshold refers to the minimum bearing capacity critical value of the support structure during the operation of the equipment, which can be specifically obtained by calculating the safety factor in combination with the material strength test data, and is used to judge whether the furnace body is in a risk state of instability. Among them, the preset time fluctuation refers to the allowable change range of the equipment vibration intensity, which can be specifically realized by calculating the standard deviation of the pressure signal using the time window statistical method, and is used to identify sudden mechanical shocks or structural looseness.

[0095] Specifically, when the furnace body 1 suffers insufficient force on the support structure due to abnormal load, the pressure sensor detects that the value continuously falls below the set lower limit. At this time, the gas control valve is immediately closed and all gas paths are cut off to avoid continuing to operate in a state of structural instability. When it is detected that the pressure data fluctuates greatly within a short time, the system automatically reduces the gas supply volume to 50% of the reference value, and at the same time activates the audible and visual alarm device to prompt the operator to check the equipment status.

[0096] In some specific embodiments, multiple groups of pressure sensor arrays can be arranged between the annular support 12 and the limit seat. For example, four detection points are evenly distributed in the circumferential direction, and the local stress error is eliminated by the average value algorithm. The gas control valve can adopt a butterfly valve structure driven by a stepping motor, and can complete the opening degree adjustment action within 200 milliseconds.

[0097] Through the real-time linkage between the pressure signal and the gas supply, this solution can cut off the energy supply at the initial stage of structural instability, and advance the safety hazard disposal node to before the accident occurs. For the detection of pressure fluctuations, the existing technology relies on manual inspection to record vibration data, and this solution realizes millisecond-level dynamic response and automatic intervention.

[0098] Through the above technical solution, the present application can quickly cut off the gas supply and trigger a warning when abnormal deformation or sudden vibration occurs in the furnace support structure, effectively preventing gas leakage or deflagration accidents caused by mechanical failure. The closed-loop control mechanism of pressure data and the gas supply system solves the problem of the lag in response of traditional safety systems and provides accurate fault location information for equipment maintenance.

[0099] The present application further proposes that the path selection logic of the four-way solenoid valve 231 includes that when the second temperature sensor of the water storage tank 6 is lower than 20°C, the four-way valve 31 connects the first heat exchange pipe 32, and when the temperature of the gas mixing tail section cavity 43 is lower than 150°C, the four-way valve 31 forcibly connects the second heat exchange pipe 33. The second heat exchange pipe 33 conducts heat into the gas mixing tail section cavity 43 to preheat and mix the mixed gas entering the gas mixing tail section cavity 43. When the temperature of the phase change heat storage unit 7 reaches the phase change critical point and the temperature of the water storage tank 6 is higher than 60°C, the four-way valve 31 switches to the third heat exchange pipe 34.

[0100] Among them, the four-way solenoid valve 231 refers to a switching device with four connection ports that can change the fluid path through electric control. Specifically, it can be implemented by a structure that drives the valve core to rotate with an electromagnetic coil, and is used to select the heat exchange medium flow path under different working conditions. The first heat exchange pipe 32 refers to a metal heat transfer pipeline arranged inside the water storage tank 6, which can be specifically implemented by a copper spiral coil structure and is used to transfer the heat of high-temperature flue gas to the scrubbing water. The second heat exchange pipe 33 refers to an annular heat transfer component arranged inside the gas mixing tail section cavity 43, which can be specifically implemented by a stainless steel bellows structure and is used to preheat the mixed gas and maintain the temperature stability of the cavity. The phase change heat storage unit 7 refers to an energy storage device that stores latent heat using phase change materials, which can be specifically implemented by a heat storage tank structure encapsulating paraffin-based phase change materials and is used to release the stored thermal energy when the system needs it. The phase change critical point refers to the temperature node at which the phase change material undergoes solid-liquid phase change, which can be specifically determined through material thermodynamics characteristic tests and is used to judge whether the heat storage unit reaches the maximum heat storage capacity.

[0101] Specifically, when it is detected that the water temperature of the water storage tank 6 is lower than the set low temperature threshold, the four-way valve 31 automatically guides the heat exchange medium to the first heat exchange pipe 32 immersed in water to preferentially ensure the basic heat demand. When the temperature at the end of the gas mixing chamber does not meet the process requirements, the second heat exchange pipe 33 is forcibly enabled to preheat the mixed gas to prevent cold gas from directly entering the combustion zone. When the phase change material completes energy storage and the water storage tank 6 reaches the preset high temperature state, the system switches the heat flow to the heat storage unit for thermal energy storage to prevent energy waste. This dynamic switching mechanism intelligently distributes the heat flow path by real-time monitoring of the temperature parameters at multiple key nodes.

[0102] Compared with the prior art, the traditional waste heat recovery system can only perform heat exchange in a single direction through fixed pipelines and cannot dynamically adjust the heat flow distribution according to the actual working conditions. This solution realizes the on-demand distribution of heat energy by constructing a multi-path switching architecture, ensuring both the supply of the basic heat load and the directional heating of key process links, while taking into account the energy storage requirements, forming a three-in-one heat management strategy.

[0103] Through the above technical solution, this application effectively solves the problem of rigid heat flow distribution in the traditional waste heat recovery system and realizes the cascaded utilization of heat energy of different grades. By intelligently switching the heat exchange path, on the premise of ensuring the basic heating demand of washing water, it preferentially meets the process temperature requirements of the gas mixing chamber and stores the excess heat for future use in a timely manner, significantly improving the comprehensive utilization efficiency of heat energy. At the same time, it avoids the risk of equipment overheating caused by excessive heat accumulation under high-temperature working conditions and ensures the safe and stable operation of the system.

[0104] What is not described in this invention can be achieved by adopting or referring to the existing technology.

[0105] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. The key point of each embodiment is to illustrate the differences from other embodiments.

[0106] The above are only the embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A new type of commercial furnace, characterized in that, It includes a furnace body. Inside the furnace body, three annular air flow chambers are provided at intervals from the inside to the outside. Between adjacent air flow chambers, two heat conduction rings are provided. Heat exchange tubes are provided inside the heat conduction rings. The heat exchange tubes have a first heat release area extending outside the heat conduction rings. On the outer wall of the furnace body, three air guide pipes are provided at intervals. The three air guide pipes are respectively connected to the three annular air flow chambers. Solenoid valves are provided on each of the air guide pipes. It further includes a gas mixing mechanism. The three air guide pipes are all connected to the output end of the gas mixing mechanism. The gas mixing mechanism has a gas mixing tail section chamber. A second heat release area is provided in parallel on the heat exchange tube through a valve member. The second heat release area is located inside the gas mixing tail section chamber. The gas mixing mechanism further includes a gas mixing middle section chamber and a gas mixing front section chamber. The two ends of the gas mixing middle section chamber are respectively connected to the gas mixing front section chamber and the gas mixing tail section chamber. The gas mixing middle section chamber has an air flow channel that first contracts and then expands. An air inlet pipe is provided on the outer wall of the gas mixing middle section chamber. The air inlet pipe is connected to the place where the cross-section of the air flow channel is the smallest. A first flux detection unit and a control valve are provided on the air inlet pipe. Swirl fins are provided on the inner wall of the gas mixing front section chamber. A second flux detection unit is provided inside the gas mixing front section chamber. It further includes a monitoring unit and a control unit for the CO / O2 concentration provided on the furnace body. The control unit controls the opening degree of the valve member according to the monitoring value of the monitoring unit. and / or the control unit adjusts the opening degree of the control valve according to the monitoring values of the detection unit, the first flux detection unit, and the second flux detection unit.

2. A novel commercial furnace according to claim 1, characterized in that, The section of the air flow channel of the gas mixing middle section chamber where the cross-section gradually becomes smaller is the contraction section. Swirl guiding vanes are provided on the inner wall of the contraction section of the gas mixing middle section chamber.

3. A novel commercial furnace according to claim 1, characterized in that, An annular flow equalizing plate is provided on each of the annular air flow chambers. The annular flow equalizing plate adopts a honeycomb ceramic structure. The pore diameter of the honeycomb ceramic structure is 2 mm, and the porosity is ≥80%.

4. A novel commercial furnace according to claim 1, characterized in that, It further includes an annular limiting seat provided on the furnace body. An annular support is nested on the annular limiting seat. A pressure sensor is provided between the annular limiting seat and the annular support. A gas control valve is provided in the gas mixing front section chamber. The control unit controls the opening degree of the gas control valve and the opening or closing of the three solenoid valves according to the detection value of the pressure sensor.

5. A novel commercial furnace according to claim 3, wherein during installation, a reservoir is arranged around the furnace body, and it is characterized in that The first heat release area is connected to a water storage tank to heat the washing water in the water storage tank.

6. A novel commercial furnace according to claim 1, characterized in that, A first temperature sensor is provided inside the gas mixing tail section chamber. A cooling component is provided outside the gas mixing tail section chamber. When the temperature sensor detects a temperature higher than the threshold value, the control unit controls the cooling component to cool down the gas mixing tail section chamber for protection.

7. A novel commercial furnace according to claim 2, characterized in that The first heat release zone includes a first heat exchange pipe located in a reservoir, the second heat release zone includes a second heat exchange pipe located inside the gas mixing tail section cavity, and further includes a phase change heat storage unit. A third heat exchange pipe is provided inside the phase change heat storage unit. The valve member is a four-way valve. The first heat exchange pipe, the second heat exchange pipe, and the third heat exchange pipe are connected in parallel with a heat exchange pipe through a four-way solenoid valve. A second temperature sensor is provided in the reservoir. The control unit adjusts the passage selection of the four-way valve according to the water temperature in the reservoir, the temperature of the gas mixing tail section cavity, and the temperature of the phase change heat storage unit.

8. A novel commercial furnace according to claim 1, characterized in that, The solenoid valves on the three gas guide pipes adopt a hierarchical control mode: When the monitoring unit detects that the CO concentration in the furnace exceeds the first threshold, the control unit closes the solenoid valve corresponding to the innermost annular air flow chamber; When the O2 concentration is lower than the second threshold, the control unit synchronously increases the opening degrees of the three solenoid valves; When the CO and O2 concentrations are both within the safe range, the control unit dynamically adjusts the opening degrees of the solenoid valves according to the flow difference between the first flux detection unit and the second flux detection unit.

9. A novel commercial furnace according to claim 1, wherein, It further includes an alarm unit. The pressure sensor is linked with the load-bearing state of the annular support: When the detection value of the pressure sensor continuously is lower than the load threshold, the control unit closes the gas control valve and cuts off the gas supply passages of the three solenoid valves; When the detection value of the pressure sensor fluctuates by more than ±20% within a preset time, the control unit reduces the opening degree of the gas control valve to 50% and triggers the alarm unit.

10. A novel commercial furnace according to claim 1, characterized in that, The passage selection logic of the four-way solenoid valve includes: When the second temperature sensor in the reservoir < 20 °C, the four-way valve connects the first heat exchange pipe; When the temperature of the gas mixing tail section cavity < 150 °C, the four-way valve forcibly connects the second heat exchange pipe. The second heat exchange pipe conducts heat into the gas mixing tail section cavity to perform waste heat recovery and mixing on the mixed gas entering the gas mixing tail section cavity; When the temperature of the phase change heat storage unit reaches the phase change critical point and the temperature of the reservoir ≥ 60 °C, the four-way valve switches to the third heat exchange pipe.

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