Flameless combustion furnace and control method

Abstract

The present invention discloses a flameless combustion furnace and a control method, which relate to the field of solid waste treatment technology. The flameless combustion furnace includes: a furnace body, an oxygen supply unit, multiple ignition units, and a detection unit; a cavity is formed in the middle of the furnace body, and an annular combustion chamber is formed between the outer surface of the cavity and the outer surface of the furnace body. The upper end of the furnace body is formed with a material inlet, and the lower end of the furnace body is formed with a material outlet; the oxygen supply unit includes a main flow pipe, one end of the main flow pipe is located on the central axis of the cavity, and the other end of the main flow pipe is located outside the furnace body; one end of the ignition unit is connected to one end of the main flow pipe, and the other end of the ignition unit is connected to the combustion chamber, and the multiple ignition units are located at the same height and are evenly distributed along the circumferential direction of the furnace body; the detection unit is arranged on the inner wall of the combustion chamber. The present invention has the advantages of high smoldering efficiency and complete smoldering.

Description

Technical Field

[0001] The present invention belongs to the technical field of solid waste treatment, and in particular relates to a flameless combustion furnace and a control method thereof. Background Art

[0002] Smoldering organic solid waste disposal technology is an emerging solid waste treatment solution primarily targeting low-calorific value organic solid waste. This technology cleverly utilizes biomass fuel and porous heat storage media to achieve low-temperature, flameless combustion, allowing the combustion process to self-sustain and propagate. It combines the advantages of traditional incineration technology: rapid reaction time and complete harmlessness after ash reduction. It also offers a unique technical advantage: it can directly dispose of highly water-rich organic solid waste without pre-drying. In principle, this technology significantly reduces the energy consumption of traditional solid waste disposal technologies, effectively reducing investment and operating costs, and presents a promising future.

[0003] The furnace type currently used is cylindrical. In actual operation, solid waste, fuel and heat storage materials are mixed in a specific proportion and added to the furnace. The material is directly heated by the heating device at the ignition position in the furnace until the ignition temperature is reached, and then air is supplied to ignite the material. However, due to the characteristics of the mixed material itself, the material layer presents a wavy shape and uneven distribution during the feeding process. In addition, the heating rod needs to be inserted into the interior of the material, which requires a protective device, which to a certain extent leads to low heat transfer efficiency. Various factors are intertwined, and ultimately result in the phenomenon that some waste materials cannot be completely burned. In order to solve such problems, a flameless combustion furnace and a control method are proposed. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, the present invention provides a flameless combustion furnace and a control method thereof, which have the advantages of high smoldering efficiency and complete smoldering.

[0006] According to the embodiment of the present invention, the flameless combustion furnace and control method include: a furnace body, an oxygen supply unit, a plurality of ignition units and a detection unit; a cavity is formed in the middle of the furnace body, the furnace body and the cavity are both cylindrical, the cavity and the furnace body are coaxially arranged in the height direction, and an annular combustion chamber is formed between the outer surface of the cavity and the outer surface of the furnace body, the upper end of the furnace body is formed with a material inlet, and the lower end of the furnace body is formed with a material outlet; the oxygen supply unit includes a main flow pipe, one end of the main flow pipe is located on the central axis of the cavity, and the other end of the main flow pipe is located outside the furnace body; one end of the ignition unit is connected to one end of the main flow pipe, and the other end of the ignition unit is connected to the combustion chamber, the multiple ignition units are located at the same height, and the multiple ignition units are evenly distributed along the circumferential direction of the furnace body; the detection unit is provided on the inner wall of the combustion chamber, and the detection unit is used to detect the smoldering state in the combustion chamber.

[0007] According to one embodiment of the present invention, the ignition unit includes: a first branch pipe, a heater and a first temperature measuring point, the first branch pipe is connected to a first control valve, the two ends of the first branch pipe are respectively connected to the main flow pipe and the combustion chamber, so as to transmit the oxygen in the main flow pipe to the combustion chamber, the heater and the first temperature measuring point are both installed on the first branch pipe, the first temperature measuring point is located between the heater and the combustion chamber, the heater is used to heat the gas in the first branch pipe, and the first temperature measuring point is used to detect the temperature of the gas in the first branch pipe.

[0008] According to one embodiment of the present invention, the oxygen supply unit further includes a plurality of second branch pipes, the second branch pipes are connected to a second control valve, the two ends of the second branch pipes are respectively connected to the main flow pipe and the combustion chamber, the plurality of second branch pipes are evenly spaced around the circumferential direction of the combustion chamber, the plurality of second branch pipes are located at the same height, and the second branch pipes are located below the ignition unit.

[0009] According to one embodiment of the present invention, the detection unit includes a first temperature measurement group, a second temperature measurement group, a third temperature measurement group and a fourth temperature measurement group, and the first temperature measurement group, the second temperature measurement group, the third temperature measurement group and the fourth temperature measurement group are arranged at intervals from bottom to top along the central axis direction of the combustion chamber; the first temperature measurement group, the second temperature measurement group, the third temperature measurement group and the fourth temperature measurement group each include multiple second temperature measurement points, and the multiple second temperature measurement points are arranged at intervals along the circumferential direction of the combustion chamber.

[0010] According to one embodiment of the present invention, the number of second temperature measurement points in the first temperature measurement group, the second temperature measurement group, the third temperature measurement group and the fourth temperature measurement group is the same as the number of ignition units and has a one-to-one correspondence.

[0011] According to one embodiment of the present invention, a cone structure is provided on the top of the cavity, and the feed port is located above the apex of the cone structure.

[0012] A method for controlling a flameless combustion furnace, using any one of the flameless combustion furnaces described above, comprises the following steps:

[0013] S1. Add fuel to the combustion chamber so that the fuel covers and is higher than the ignition unit;

[0014] S2. A mixture of heat storage material, fuel and solid waste is added in stages above the fuel;

[0015] S3 uses an ignition unit to supply high-temperature hot air into the combustion chamber to cause the fuel to smolder while drying the mixture above the fuel;

[0016] S4. The oxygen supply unit continuously supplies oxygen to the combustion chamber;

[0017] S5. The detection unit detects the smoldering state in the combustion chamber and, based on the detection results, drives the corresponding ignition unit to open or increase the oxygen supply of the oxygen supply unit;

[0018] S6. Discharge part of the ash from the discharge port according to the detection results of the detection unit.

[0019] According to one embodiment of the present invention, in S5, if the detection unit detects that a part of the area is not smoldering, the ignition unit is controlled to ignite the area; if it is detected that a vertical area is smoldering slowly, the oxygen supply to the area is increased.

[0020] The beneficial effect of the present invention is that the combustion chamber is set as an annular structure, and multiple ignition units are arranged inside the combustion chamber, so that the cross section of the combustion chamber is dispersed into multiple small areas, and then the multiple ignition units are used to control them separately, thereby achieving ignition uniformity, avoiding the phenomenon of incomplete smoldering, and improving the ignition efficiency. In addition, since the area responsible for each ignition unit is small, the ignition unit only needs to ignite on one side of its corresponding area without being inserted into the material, thereby reducing the loss of the ignition unit due to high temperature and increasing the service life of the ignition unit.

[0021] A detection unit is used to detect the smoldering situation in the combustion chamber, and the corresponding ignition units are controlled to perform secondary ignition operations according to the detection results. This enables timely processing in the state of incomplete local smoldering, avoids the situation where there is unsmoldering in the discharged ash, and ensures the completeness of the smoldering.

[0022] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0025] Figure 1 It is a schematic side sectional view of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of a top cross-sectional structure of the present invention;

[0027] Reference numerals:

[0028] 1. Furnace body; 11. Feed inlet; 12. Feed outlet; 2. Main flow pipe; 3. First branch pipe; 31. First temperature measurement point; 4. Second branch pipe; 5. Combustion chamber; 61. First temperature measurement group; 62. Second temperature measurement group; 63. Third temperature measurement group; 64. Fourth temperature measurement group. DETAILED DESCRIPTION

[0029] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0032] The flameless combustion furnace and control method according to the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] like Figure 1-2 As shown, a flameless combustion furnace and a control method according to an embodiment of the present invention include: a furnace body 1, an oxygen supply unit, a plurality of ignition units and a detection unit; a cavity is formed in the middle of the furnace body 1, the furnace body 1 and the cavity are both cylindrical, the cavity and the furnace body 1 are coaxially arranged in the height direction, a combustion chamber 5 is formed between the outer surface of the cavity and the outer surface of the furnace body 1, an inlet 11 is formed at the upper end of the furnace body 1, and an outlet 12 is formed at the lower end of the furnace body 1; the oxygen supply unit includes a main flow pipe 2, one end of the main flow pipe 2 is located inside the cavity, and the other end of the main flow pipe 2 is located outside the furnace body 1; one end of the ignition unit is connected to one end of the main flow pipe 2, and the other end of the ignition unit is connected to the combustion chamber 5, the multiple ignition units are located at the same height, and the multiple ignition units are evenly spaced; the detection unit is provided on the inner wall of the combustion chamber 5, and the detection unit is used to detect the smoldering state in the combustion chamber 5.

[0034] In this embodiment, the combustion chamber 5 is configured as an annular structure, and a plurality of ignition units are provided inside the combustion chamber 5, thereby dispersing the cross section of the combustion chamber 5 into a plurality of small areas, which are then controlled separately by a plurality of ignition units, thereby achieving uniform ignition, avoiding incomplete smoldering, and improving ignition efficiency. In addition, since each ignition unit is responsible for a relatively small area, the ignition unit only needs to ignite on one side of its corresponding area, without having to be inserted into the material, thereby reducing the high temperature damage to the ignition unit and increasing the service life of the ignition unit. A detection unit is used to detect the smoldering situation in the combustion chamber 5, and the corresponding ignition units are controlled to perform secondary ignition operations according to the detection results, thereby achieving timely processing in the state of incomplete local smoldering, avoiding the situation where there is unsmoldered ash in the discharged material, and ensuring the completeness of smoldering.

[0035] The furnace body 1 and the cavity are both cylindrical.

[0036] One end of the main flow pipe 2 is located on the central axis of the cavity, and a plurality of ignition units are evenly distributed along the circumferential direction of the furnace body 1 .

[0037] In this embodiment, the areas of the regions corresponding to the ignition units are made the same, thereby reducing the time difference for complete smoldering of the regions and improving the overall working efficiency.

[0038] The ignition unit includes: a first branch pipe 3, a heater and a first temperature measuring point 31. The first branch pipe 3 is connected to a first control valve. The two ends of the first branch pipe 3 are respectively connected to the main flow pipe 2 and the combustion chamber 5, so as to transmit the oxygen in the main flow pipe 2 to the combustion chamber 5. The heater and the first temperature measuring point 31 are both installed on the first branch pipe 3. The first temperature measuring point 31 is located between the heater and the combustion chamber 5. The heater is used to heat the gas in the first branch pipe 3, and the first temperature measuring point 31 is used to detect the temperature of the gas in the first branch pipe 3.

[0039] In this embodiment, when ignition is required, the first control valve and the heater are opened to direct the gas in the main flow pipe 2 to the combustion chamber 5, and the gas is heated to achieve the ignition effect. After the ignition is completed, the heater can be controlled to be turned off and oxygen can continue to be supplied to the combustion chamber 5. The heater is an electromagnetic heater, which uses the electromagnetic principle to heat the first branch pipe 3. It has a simple structure and can directly apply hot air to the material. The heating speed is fast, which improves the heating efficiency, so as to quickly ignite and subsequently quickly adjust the biased burning situation.

[0040] The oxygen supply unit also includes multiple second branch pipes 4, which are connected to a second control valve. The two ends of the second branch pipes 4 are respectively connected to the main flow pipe 2 and the combustion chamber 5. The multiple second branch pipes 4 are evenly spaced around the circumference of the combustion chamber 5. The multiple second branch pipes 4 are located at the same height. The second branch pipes 4 are located below the ignition unit. The second control valve can control the air intake of the second branch pipe 4.

[0041] In this embodiment, the second branch pipe 4 is used to supply oxygen to the combustion chamber 5, and in the process of supplying oxygen, the ash material below the first branch pipe 3 is cooled so that the discharged ash material is in a low-temperature state. At the same time, the heat carried by the ash material is blown upward, and the heat is used to smolder the material above the first branch pipe 3 and dry the material at the upper end of the combustion chamber 5, thereby reducing the demand for material dryness and saving the step of pre-drying treatment.

[0042] The detection unit includes a first temperature measurement group 61, a second temperature measurement group 62, a third temperature measurement group 63 and a fourth temperature measurement group 64. The first temperature measurement group 61, the second temperature measurement group 62, the third temperature measurement group 63 and the fourth temperature measurement group 64 are arranged at intervals from bottom to top along the central axis direction of the combustion chamber 5; the first temperature measurement group 61, the second temperature measurement group 62, the third temperature measurement group 63 and the fourth temperature measurement group 64 each include multiple second temperature measurement points, and the multiple second temperature measurement points are arranged at intervals along the circumferential direction of the combustion chamber 5.

[0043] In this embodiment, in the vertical direction, the first branch pipe 3, the second branch pipe 4, and the second temperature measurement point correspond to each other; the number of the first branch pipe 3 is , ; The number of the first branch pipe 3 can be adjusted appropriately; The outer radius of the combustion chamber 5 is The unitless value of the unit.

[0044] The second branch pipe 4 is located about 0.2 , which plays the role of normal smoldering oxygen supply and cooling ash for the normal air inlet; the first branch pipe 3 is located about 0.6 It is used to provide high-temperature hot air for ignition when starting the furnace and to supplement heat when the working conditions are poor.

[0045] Based on the radius of the combustion chamber 5 and the processing capacity, the required material height can be calculated as:

[0046]

[0047] In the formula Height of smoldering material , Daily mixture processing volume , Smoldering furnace outer radius , Smoldering furnace inner circle radius , Density of the mixture .

[0048] Smoldering disposal rate ;

[0049] In the formula Smoldering disposal rate , Daily mixture processing volume , Smoldering furnace outer radius , Smoldering furnace inner circle radius , Density of the mixture , Actual smoldering time of the material , yes The unitless value of .

[0050] The combustion chamber 5 is divided into a cooling section, a smoldering section, and a drying section from bottom to top. The first branch pipe 3 is located at the bottom of the smoldering section; the first temperature measurement group 61 is located 5-8 meters above the bottom of the cooling section. The second temperature measuring group 62 and the third temperature measuring group 63 are both located in the smoldering section, and the second temperature measuring group 62 is located above the first branch pipe 3 2 The third temperature measurement group 63 is located above the second temperature measurement group 62. The left and right positions are suitable, that is, the height of the smoldering section is controlled at 2 It is used to detect the smoldering area in the smoldering section, evaluate the smoldering layer position of the material, and promptly discover the phenomenon of partial burning; the fourth temperature measurement group 64 is located in the drying section, 5-8 meters above the smoldering section. Position, detect the pyrolysis effect and drying degree of the material in the drying section.

[0051] The number of the second temperature measurement points of the first temperature measurement group 61 , the second temperature measurement group 62 , the third temperature measurement group 63 and the fourth temperature measurement group 64 is the same as the number of the ignition units and corresponds one to one.

[0052] In this embodiment, a one-to-one correspondence is provided to facilitate detection of specific off-center burning locations and rapid implementation of corresponding improvement measures.

[0053] The cavity can be understood as a tube body, which is the inner wall of the combustion chamber 5. A cone structure is formed on the top of the cavity, which seals the upper end of the tube body. The feed port 11 is located above the apex of the cone structure.

[0054] In this embodiment, it is convenient to disperse the materials, so that the materials in the annular combustion chamber 5 are distributed more evenly, and the structure is simple, the occupied area is small, and the volume of the flameless combustion furnace is reduced.

[0055] A method for controlling a flameless combustion furnace, using the above-mentioned flameless combustion furnace, comprises the following steps:

[0056] S1. Add fuel into the combustion chamber 5 so that the fuel covers and is higher than the ignition unit; first add the heat storage material so that the height of the heat storage material is flush with the lower surface of the first branch pipe 3, thereby avoiding the presence of unsmoldering materials in the area below the first branch pipe 3 and improving the completeness of the smoldering; then fill in some fuel and make the fuel have a certain height to increase the ignition speed during the initial ignition and dry the subsequent mixture above it.

[0057] S2. Add a mixture of heat storage material, fuel and solid waste in stages above the fuel; the heat storage material can be sand and gravel, and the fuel can be biomass.

[0058] S3. Use the ignition unit to supply high-temperature hot air into the combustion chamber 5 to cause the fuel to smolder and simultaneously dry the mixture above the fuel. After ignition is completed, the ignition unit is turned off. During this process, the second branch pipe 4 is closed. Specifically, turn on the heater and control the temperature of the air supplied from the first branch pipe 3 to approximately 200°C. When the temperature in the corresponding areas of the second temperature measurement group 62 and the third temperature measurement group 63 reaches above 100°C, this step is controlled to take place within 30-60 minutes to dry the fuel and mixture. Then, increase the heater power to control the temperature of the air supplied from the first branch pipe 3 to 600°C within 30-60 minutes, and keep it above 500°C for at least 10 minutes, so that the fuel can ignite (the ignition point of biomass is generally 400-600°C). During the heating process, determine whether the fuel has ignited based on the temperature change of the first temperature measurement point 31. After ignition, control the temperature of the air supplied from the first branch pipe 3 to gradually decrease to 100°C within 10 minutes, then turn off the heater and gradually reduce the air supply from the first branch pipe 3 to the operating requirements, completing the furnace startup.

[0059] S4. Close the first branch pipe 3 and use the second branch pipe 4 to supply oxygen to the combustion chamber 5 so that the gas passes through the cooling section. While supplying oxygen to the combustion chamber 5, the smoldering ash in the cooling section is cooled, and the temperature of the ash is driven toward the mixture above to dry it.

[0060] S5. The detection unit detects the smoldering state in the combustion chamber, and drives the corresponding ignition unit to open or increase the oxygen supply of the oxygen supply unit according to the detection result; wherein, when the second temperature measuring point of the smoldering section detects that the temperature of its corresponding area drops or the smoldering height is lower than that of the adjacent area, the second branch pipe 4 of the corresponding area is controlled to increase the oxygen supply. If it is detected that there is still no obvious change after increasing the oxygen supply, the corresponding second branch pipe 4 is closed, and the corresponding ignition unit is turned on for re-ignition. Within 1 to 5 minutes, the air supply temperature of the first branch pipe 3 is quickly controlled to 600℃ and high-temperature air is blown in. In this way, the combustion speed is quickly replenished to ensure sufficient smoldering in the area and then switch to the second branch pipe 4 after it is reasonable; when it is judged that the smoldering speed of a certain area is too fast during operation, it means that the smoldering area has moved upward, and the air volume of the second branch pipe 4 is reduced to slow down the combustion speed until the smoldering area is normal.

[0061] Specifically, the average value of all temperature points in each layer is calculated (after removing bad points, that is, the temperature display is extremely different from other temperatures in the same layer is considered a bad point).

[0062]

[0063] in Indicates the mean temperature of a layer, corresponding to the layer Number of effective temperature points (excluding bad points).

[0064] Calculate the standard deviation of the temperature of a certain layer

[0065] in represents the standard deviation, Indicates the data points,

[0066] The uneven (dispersion) coefficient of a certain layer Comparison of the degree of data dispersion.

[0067] The above data shows that the smaller the standard deviation and nonuniformity coefficient, the more concentrated the data. This means that the fluctuations in the cooling, smoldering, and drying sections are smaller, and the horizontal surface is smoother, indicating an ideal operating condition. The larger the standard deviation and nonuniformity (dispersion) coefficient, the more dispersed the data. This means that the fluctuations in the cooling, smoldering, and drying sections are greater, indicating worse operating conditions.

[0068] The deviation of each temperature point from the mean D= ;

[0069] Standard score ;

[0070] Indicates the The standard score of each data point is used to represent the relative position of a number in a set of data. In this way, the measured values ​​of each area of ​​the four-layer temperature can be compared together, which is conducive to the adjustment of working conditions.

[0071] The above temperature data is calculated periodically every N1min (N1≥1, set by the operator interface) to meet the needs.

[0072] Calculation process:

[0073] 1. Calculate the uneven (discrete) coefficient of a certain layer ;

[0074] 2. Judgment:

[0075] ;

[0076] ;

[0077] ;

[0078] 3. Calculate the standard score for each temperature point in a certain layer

[0079] ;

[0080] ;

[0081] ;

[0082] 4. Calculate the adjustment state value of each point in each layer

[0083] In the formula No. Layer heterogeneity (dispersion) coefficient , No. Tier Standard score of points;

[0084] 5. Calculate the sum of the adjustment status values ​​corresponding to each temperature measurement point on the four layers .

[0085] Due to the slow smoldering speed, the operating damper adjustment frequency is periodically adjusted once every N2min (N2≥5, set by the operator interface), and each adjustment only adjusts the largest, second largest, second smallest, and smallest four second branches 4.

[0086] Calculation process:

[0087] 1. Calculate the total mean of the corresponding point adjustment status values ​​within this period ;

[0088] 2. Put all the points The values ​​are sorted by size;

[0089] 3. Find out The four second branches 4 corresponding to the largest, second largest, second smallest, and smallest values;

[0090] 4. Adjust the corresponding 4 second branches 4 to increase or decrease value.

[0091] S6. According to the detection results of the detection unit, part of the ash is discharged from the discharge port 12. When the second temperature measurement points in the cooling section show that the temperature of the area reaches the preset range, it can be manually or automatically discharged from the bottom of the combustion chamber 5.

[0092] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0093] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A flameless combustion furnace, characterized in that: include: A furnace body (1), wherein a cavity is formed in the middle of the furnace body (1), the furnace body (1) and the cavity are both cylindrical, the cavity and the furnace body (1) are coaxially arranged, an annular combustion chamber (5) is formed between the outer surface of the cavity and the outer surface of the furnace body (1), an inlet (11) is formed at the upper end of the furnace body (1), and a discharge port (12) is formed at the lower end of the furnace body (1); An oxygen supply unit, the oxygen supply unit comprising a main flow pipe (2), one end of the main flow pipe (2) being located on the central axis of the cavity, and the other end of the main flow pipe (2) being located outside the furnace body (1); a plurality of ignition units, one end of each ignition unit being connected to one end of the main flow tube (2), and the other end of each ignition unit being connected to the combustion chamber (5), the plurality of ignition units being located at the same height, and the plurality of ignition units being evenly distributed along the circumferential direction of the furnace body (1); A detection unit is provided on the inner wall of a combustion chamber (5), and is used to detect a smoldering state in the combustion chamber (5); the detection unit comprises a first temperature measurement group (61), a second temperature measurement group (62), a third temperature measurement group (63) and a fourth temperature measurement group (64), and the first temperature measurement group (61), the second temperature measurement group (62), the third temperature measurement group (63) and the fourth temperature measurement group (64) are arranged at intervals from bottom to top along the central axis direction of the combustion chamber (5); the first temperature measurement group (61), the second temperature measurement group (62), the third temperature measurement group (63) and the fourth temperature measurement group (64) each comprise a plurality of second temperature measurement points, and the plurality of second temperature measurement points are arranged at intervals along the circumferential direction of the combustion chamber (5).

2. The flameless combustion furnace according to claim 1, characterized in that The ignition unit comprises: a first branch pipe (3), a heater and a first temperature measuring point (31); the first branch pipe (3) is connected to a first control valve; the two ends of the first branch pipe (3) are respectively connected to the main flow pipe (2) and the combustion chamber (5) so as to transmit oxygen in the main flow pipe (2) to the combustion chamber (5); the heater and the first temperature measuring point (31) are both installed on the first branch pipe (3); the first temperature measuring point (31) is located between the heater and the combustion chamber (5); the heater is used to heat the gas in the first branch pipe (3); and the first temperature measuring point (31) is used to detect the temperature of the gas in the first branch pipe (3).

3. The flameless combustion furnace according to claim 2, characterized in that: The oxygen supply unit further comprises a plurality of second branch pipes (4), the second branch pipes (4) being connected to a second control valve, the two ends of the second branch pipes (4) being respectively connected to the main flow pipe (2) and the combustion chamber (5), the plurality of second branch pipes (4) being evenly spaced around the circumference of the combustion chamber (5), the plurality of second branch pipes (4) being located at the same height, and the second branch pipes (4) being located below the ignition unit.

4. The flameless combustion furnace according to claim 3, characterized in that The number of the second temperature measurement points of the first temperature measurement group (61), the second temperature measurement group (62), the third temperature measurement group (63) and the fourth temperature measurement group (64) is the same as the number of the ignition units and corresponds one to one.

5. The flameless combustion furnace according to claim 1, characterized in that A cone structure is provided at the top of the cavity, and the feed port (11) is located above the apex of the cone structure.

6. A method for controlling a flameless combustion furnace, characterized in that: The flameless combustion furnace according to any one of claims 1 to 5 is used, comprising the following steps: S1. Add fuel to the combustion chamber (5) so that the fuel covers and is higher than the ignition unit; S2. A mixture of heat storage material, fuel and solid waste is added in stages above the fuel; S3. Using an ignition unit to supply high-temperature hot air into the combustion chamber (5) to cause the fuel to smolder while drying the mixture above the fuel; S4. The oxygen supply unit continuously supplies oxygen to the combustion chamber (5); S5. The detection unit detects the smoldering state in the combustion chamber and, based on the detection results, drives the corresponding ignition unit to open or increase the oxygen supply of the oxygen supply unit; S6. Discharge part of the ash from the discharge port (12) according to the detection result of the detection unit.

7. The flameless combustion furnace control method according to claim 6, characterized in that: In S5, if the detection unit detects that a part of the area is not smoldering, the ignition unit is controlled to ignite the area; if it is detected that a vertical area is smoldering slowly, the oxygen supply to the area is increased.

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