Flameless combustion furnace and control method

Abstract

The invention discloses a flameless combustion furnace and a control method, and relates to the technical field of solid waste treatment, the flameless combustion furnace comprises 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, an annular combustion chamber is formed between the outer surface of the cavity and the outer surface of the furnace body, a feeding port is formed in the upper end of the furnace body, and a discharging port is formed in the lower end of the furnace body; the oxygen supply unit comprises 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 each ignition unit is connected with one end of the main flow pipe, the other end of each ignition unit is connected with the combustion chamber, the multiple ignition units are located at the same height, and the multiple ignition units are evenly distributed in the circumferential direction of the furnace body; and the detection unit is arranged on the inner wall of the combustion chamber. The smoldering method 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 particularly relates to a flameless combustion furnace and a control method therefor. Background Art

[0002] The smoldering organic solid waste disposal technology, as an emerging solid waste treatment solution, mainly targets low calorific value organic solid waste. This technology ingeniously utilizes biomass fuel and porous heat storage medium materials to achieve low-temperature flameless combustion and enable the self-sustaining propagation of the combustion process. It not only combines the advantages of traditional incineration technologies, such as rapid reaction and thorough harmlessness after ashing, but also has unique technical advantages - for highly water-containing organic solid waste, it can be directly disposed of without prior drying. From a principle perspective, this technology significantly reduces the energy consumption of traditional solid waste disposal technologies, effectively reducing investment and operating costs, and showing extremely broad development prospects.

[0003] The currently used furnace type is cylindrical. In actual operation, the solid waste, fuel, and heat storage material are mixed in a specific ratio and then added into the furnace. Through the heating device at the ignition position in the furnace, the material is directly heated 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, during the feeding process, the material layer presents a wavy shape and is unevenly distributed. In addition, the heating rod needs to be inserted into the material, which requires the equipped protection device, and this to a certain extent leads to low heat transfer efficiency. Multiple factors are intertwined, ultimately resulting in the phenomenon that some waste materials cannot be completely burned. To solve such problems, a flameless combustion furnace and a control method therefor 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] For this reason, the present invention provides a flameless combustion furnace and a control method therefor, which have the advantages of high smoldering efficiency and complete smoldering.

[0006] The flameless combustion furnace and control method according to an embodiment of the present invention 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, both the furnace body and the cavity are cylindrical, the cavity and the furnace body are coaxially arranged in the height direction, an annular combustion chamber is formed between the outer surface of the cavity and the outer surface of the furnace body, a feed inlet is formed at the upper end of the furnace body, and a discharge outlet is formed at the lower end of the furnace body; 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 a plurality of the 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 and is used to detect the smoldering state in the combustion chamber.

[0007] According to an embodiment of the present invention, the ignition unit includes: a first branch pipe, a heater, and a first temperature measurement point. The first branch pipe is connected with a first control valve. Both ends of the first branch pipe are respectively connected to the main flow pipe and the combustion chamber to be used for transmitting the oxygen in the main flow pipe to the combustion chamber. The heater and the first temperature measurement point are both installed on the first branch pipe. The first temperature measurement 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 measurement point is used to detect the temperature of the gas in the first branch pipe.

[0008] According to an embodiment of the present invention, the oxygen supply unit further includes a plurality of second branch pipes. The second branch pipes are connected with second control valves. Both ends of the second branch pipes are respectively connected to the main flow pipe and the combustion chamber. A plurality of the second branch pipes are evenly spaced along the circumferential direction of the combustion chamber. A plurality of the second branch pipes are located at the same height, and the second branch pipes are located below the ignition unit.

[0009] According to an 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. The first temperature measurement group, the second temperature measurement group, the third temperature measurement group, and the fourth temperature measurement group are spaced apart 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 all include a plurality of second temperature measurement points, and a plurality of the second temperature measurement points are spaced apart along the circumferential direction of the combustion chamber.

[0010] According to an embodiment of the present invention, the number of the 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 the ignition units and corresponds one by one.

[0011] According to an embodiment of the present invention, a cone structure is provided at the top of the cavity, and the feed inlet is located above the vertex of the cone structure.

[0012] A control method for a flameless combustion furnace, using the flameless combustion furnace described in any one of the above, includes the following steps: S1. Add fuel into the combustion chamber so that the fuel covers and is higher than the ignition unit; S2. Add a mixture of heat storage material, fuel and solid waste into the combustion chamber in a staged manner above the fuel; S3. Use the ignition unit to supply high-temperature hot air into the combustion chamber to make the fuel smolder, and at the same time dry the mixture above the fuel; S4. The oxygen supply unit continuously supplies oxygen into the combustion chamber; S5. The detection unit detects the smoldering state in the combustion chamber. According to the detection result, drive the corresponding ignition unit to turn on or increase the oxygen supply of the oxygen supply unit; S6. Discharge part of the ash from the discharge port according to the detection result of the detection unit.

[0013] According to an embodiment of the present invention, in S5, if the detection unit detects that some areas are not smoldering, control the ignition unit to ignite these areas; if it is detected that the smoldering in a certain vertical area is slower, increase the oxygen supply in this area.

[0014] The beneficial effects of the present invention are as follows. The present invention adopts a ring-shaped structure for the combustion chamber and arranges a plurality of ignition units inside the combustion chamber, so as to disperse the cross-section of the combustion chamber into multiple small areas, and then use the multiple ignition units to control respectively, realizing the uniformity of ignition, avoiding the phenomenon of incomplete smoldering, and at the same time 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 and does not need to be inserted into the material, so the loss of the ignition unit caused by high temperature is reduced, and the service life of the ignition unit is improved; The detection unit is used to detect the smoldering situation in the combustion chamber, and according to the detection result, control the corresponding ignition unit to perform secondary ignition operations respectively, realizing timely treatment in the state of incomplete local smoldering, avoiding the situation of unsmoldered ash in the discharged ash, and ensuring the completeness of smoldering.

[0015] Other features and advantages of the present invention will be described in the subsequent description, and part of them will become obvious from the description or be understood by implementing the present invention.

[0016] To make the above objects, features and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0017] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where: Figure 1It is a schematic side-sectional view of the overall structure of the present invention; Figure 2 It is a schematic top-sectional view of the present invention; Reference numerals: 1. Furnace body; 11. Feed inlet; 12. Discharge 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. Specific embodiments

[0018] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship 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, so they should not be construed as limiting the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. 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.

[0020] The flameless combustion furnace and control method according to the embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

[0021] As Figure 1-2As shown in the figure, 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. Both the furnace body 1 and the cavity are 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. A plurality of ignition units are at the same height and are evenly spaced; the detection unit is arranged on the inner wall of the combustion chamber 5 and is used to detect the smoldering state in the combustion chamber 5.

[0022] In this embodiment, the combustion chamber 5 is set as an annular structure, and a plurality of ignition units are arranged inside the combustion chamber 5. In this way, the cross-section of the combustion chamber 5 is dispersed into a plurality of small areas, and then controlled separately by a plurality of ignition units, realizing the uniformity of ignition, avoiding the phenomenon of incomplete smoldering, and at the same time 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 and does not need to be inserted into the material, so the loss of the ignition unit caused by high temperature is reduced, and the service life of the ignition unit is improved. The detection unit is used to detect the smoldering situation in the combustion chamber 5, and the corresponding ignition unit is controlled to perform secondary ignition operations according to the detection results, realizing timely treatment in the state of incomplete local smoldering, avoiding the situation of unsmoldered materials in the discharged ash, and ensuring the completeness of smoldering.

[0023] Both the furnace body 1 and the cavity are cylindrical.

[0024] 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.

[0025] In this embodiment, the areas corresponding to the ignition units are the same, so the time difference of complete smoldering in each area is reduced, and the overall working efficiency is improved.

[0026] 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 with a first control valve. Both ends of the first branch pipe 3 are respectively connected to the main flow pipe 2 and the combustion chamber 5 for transmitting 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.

[0027] In this embodiment, when ignition is required, the first control valve and the heater are turned on, so that the gas in the main flow pipe 2 is guided to the combustion chamber 5 and the gas is heated to achieve the effect of ignition. After the ignition is completed, the heater can be controlled to be turned off, and oxygen supply to the combustion chamber 5 continues. The heater is an electromagnetic heater, which heats the first branch pipe 3 by using the electromagnetic principle. It has a simple structure, can directly act hot air on the material, has a fast heating rate, improves the heating efficiency, and is used for rapid ignition and subsequent rapid adjustment of uneven burning.

[0028] The oxygen supply unit further includes a plurality of second branch pipes 4. The second branch pipes 4 are connected with second control valves. The two ends of the second branch pipes 4 are respectively connected with the main flow pipe 2 and the combustion chamber 5. The plurality of second branch pipes 4 are evenly spaced along the circumferential direction of the combustion chamber 5. The plurality of second branch pipes 4 are located at the same height. The second branch pipes 4 are located below the ignition unit. The second control valves can control the air intake volume of the second branch pipes 4.

[0029] In this embodiment, the second branch pipes 4 are used to supply oxygen to the combustion chamber 5. During the oxygen supply process, 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 materials above the first branch pipe 3 are smoldered and the materials at the upper end of the combustion chamber 5 are dried by using this heat, reducing the requirement for the dryness of the materials and saving the steps of pre-drying treatment.

[0030] 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 all include 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.

[0031] In this embodiment, in the vertical direction, the first branch pipe 3, the second branch pipe 4 and the second temperature measurement points correspond; the number of the first branch pipes 3 is , ; the number of the first branch pipes 3 can be adjusted appropriately; The outer radius of the combustion chamber 5 is a dimensionless numerical value in units.

[0032] The second branch pipes 4 are arranged about 0.2 away from the combustion chamber 5, serving as normal air inlets to meet the normal smoldering oxygen supply demand and cool the ash material; the first branch pipes 3 are arranged about 0.6 away from the combustion chamber 5, used to provide high-temperature hot air for ignition during furnace startup and supplement heat when the working conditions are poor.

[0033] From the radius and processing capacity of the combustion chamber 5, the required height of the material can be calculated as:

[0034] wherein smoldering material height , daily throughput of the mixture , outer radius of the smoldering furnace , inner radius of the smoldering furnace , density of the mixture .

[0035] smoldering disposal rate ; wherein smoldering disposal rate , daily throughput of the mixture , outer radius of the smoldering furnace , inner radius of the smoldering furnace , density of the mixture , actual smoldering time of the material , is a unitless value of

[0036] 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. Among them, the first temperature measurement group 61 is located 5 - 8 is appropriate above the bottom of the cooling section for detecting the cooling effect of the cooling section; the second temperature measurement group 62 and the third temperature measurement group 63 are both located in the smoldering section. The second temperature measurement group 62 is located about 2 above the first branch pipe 3, and the third temperature measurement group 63 is located about 2 above the second temperature measurement group 62, that is, the height of the smoldering section is controlled at about 2 for detecting the smoldering area in the smoldering section, evaluating the position of the smoldering layer of the material, and timely discovering the phenomenon of uneven burning; the fourth temperature measurement group 64 is located in the drying section, 5 - 8 above the smoldering section for detecting the pyrolysis effect and drying degree of the material in the drying section.

[0037] 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 ignition units and corresponds one by one.

[0038] In this embodiment, one-to-one correspondence is adopted to facilitate the detection of specific partial burning positions and quickly make corresponding improvement measures.

[0039] The cavity can be understood as a pipe body, which is the inner wall of the combustion chamber 5. A conical structure is formed at the top of the cavity, and the conical structure seals the upper end of the pipe body. The feeding port 11 is located above the vertex of the conical structure.

[0040] In this embodiment, it is convenient to disperse the materials, making the distribution of materials in the annular combustion chamber 5 more uniform. Moreover, the structure is simple, the occupied area is small, and the volume of the flameless combustion furnace is reduced.

[0041] A control method for a flameless combustion furnace, adopting the above-mentioned flameless combustion furnace, includes the following steps: S1. Add fuel into the combustion chamber 5 so that the fuel covers and is higher than the ignition unit; first, add heat storage materials so that the height of the heat storage materials is flush with the lower surface of the first branch pipe 3, thereby avoiding unsmoldering materials in the area below the first branch pipe 3 and improving the completeness of smoldering; then fill in part of the fuel and make the fuel have a certain height to increase the ignition speed during initial ignition and dry the mixture above it subsequently.

[0042] S2. Add the mixture mixed with heat storage materials, fuel, and solid waste in a staged manner above the fuel; the heat storage materials can be sand and gravel, and the fuel can be biomass.

[0043] S3. Supply high-temperature hot air into the combustion chamber 5 by using the ignition unit to make the fuel smolder, and at the same time dry the mixture above the fuel. After ignition is completed, the ignition unit is closed; during this process, the second branch pipe 4 is in a closed state. Specifically, turn on the heater and control the temperature supplied by the first branch pipe 3 at about 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, the time of this step is controlled within 30 - 60 min to dry the fuel and the mixture; then increase the power of the heater and control the temperature supplied by the first branch pipe 3 at 600 °C within 30 - 60 min, and the time above 500 °C is not less than 10 min, so that all the fuel can be ignited (the ignition point of biomass is generally 400 - 600 °C); during the heating process, judge whether it is ignited according to the change of the temperature at the first temperature measurement point 31; after ignition, control the temperature supplied by the first branch pipe 3 to gradually decrease to 100 °C within 10 min and then turn off the heater, and the air supply volume of the first branch pipe 3 also gradually decreases to the working condition requirement, and the furnace startup is completed.

[0044] S4. Close the first branch pipe 3 and supply oxygen to the combustion chamber 5 by using the second branch pipe 4 so that the gas passes through the cooling section. While supplying oxygen to the combustion chamber 5, cool the ash material after smoldering in the cooling section, and at the same time drive the temperature of the ash material upward to the mixture above it to dry it.

[0045] S5. The detection unit detects the smoldering state in the combustion chamber. According to the detection results, it drives the corresponding ignition unit to turn on or increase the oxygen supply of the oxygen supply unit. Among them, when the second temperature measurement point in 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 in its 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. The air supply temperature of the first branch pipe 3 is quickly controlled at 600 °C within 1 - 5 minutes to blow in high-temperature air, so as to quickly make up for the combustion speed and ensure sufficient and reasonable smoldering in this area before switching to the second branch pipe 4. During operation, when it is judged that the smoldering speed in a certain area is too fast, it means that the smoldering area moves upward, then the air volume of the second branch pipe 4 is reduced to slow down the combustion speed until the smoldering area returns to normal.

[0046] Specifically, the average value of all temperature point data of each layer is calculated (calculated after excluding bad points, that is, the temperature display that differs greatly from other temperatures in the same layer is regarded as a bad point)

[0047] Among them represents the average temperature of a certain layer, corresponding layer number of valid temperature points (excluding bad points).

[0048] standard deviation of temperature calculation for a certain layer

[0049] Among them represents the standard deviation, represents the th data point, non-uniformity (discreteness) coefficient of a certain layer comparison of data discreteness.

[0050] It can be shown from the above data that the smaller the standard deviation and non-uniformity coefficient, the more concentrated the data, that is, the smaller the fluctuations in the cooling section, smoldering section, and drying section, and the better the flatness of the horizontal plane, which is an ideal working condition. The larger the standard deviation and non-uniformity (discreteness) coefficient, the more dispersed the data, that is, the larger the fluctuations in the cooling section, smoldering section, and drying section, and the worse the working condition.

[0051] deviation from the mean of each temperature point of a certain layer ; standard score ; represents the th standard score of the data point, which is used to represent the measure of the relative position of a certain 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 working condition adjustment.

[0052] The above temperature data is calculated once every ( , set by the operator interface), which can meet the requirements.

[0053] Calculation process: 1. Calculate the non-uniformity (discrete) coefficient of a certain layer ; 2. Judgment: if C ≥ 0.5 then KC = 11: Accelerating adjustment is required; if 0.2 ≤ C < 0.5 then KC = 0.50.5: Normal speed adjustment; if C < 0.2 then KC = 00: No adjustment is required; 3. Calculate the standard score of each temperature point in a certain layer

[0054] if ≥ 0.7 then K = -1-1: Decelerating adjustment; if 0.4 ≤ < 0.7 then K = 00: No adjustment is required; if < 0.4 then K = 01: Accelerating adjustment; 4. Calculate the adjustment status value of each point in each layer

[0055] In the formula The layer non-uniformity (discrete) coefficient , The layer point standard score; 5. Calculate the sum of the adjustment status values of the corresponding points of each temperature measurement point in the four layers .

[0056] Due to the slow smoldering speed, the working condition damper is adjusted periodically every ( , set by the operator interface), and only the 4 largest, second largest, second smallest, and smallest second branch pipes 4 are adjusted each time.

[0057] Calculation process: 1. Calculate the average value of the sum of the adjustment status values of the corresponding points in this cycle ; 2. Sort the values of all points in descending order; 3. Find Four second branch pipes 4 corresponding to the values with the largest, second largest, second smallest, and smallest values; 4. Adjust the corresponding four second branch pipes 4 to control the increase or decrease of the value.

[0058] S6. According to the detection result 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 all show that the temperature in their areas reaches the preset range, it can be manually or automatically discharged from the bottom of the combustion chamber 5.

[0059] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean 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 representations 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.

[0060] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A flameless combustion furnace, characterized in that, Comprising: A furnace body (1), a cavity is formed in the middle of the furnace body (1), both the furnace body (1) and the cavity are cylindrical, the cavity is coaxially arranged with the furnace body (1), an annular combustion chamber (5) is formed between the outer surface of the cavity and the outer surface of the furnace body (1), a feeding port (11) is formed at the upper end of the furnace body (1), and a discharging port (12) is formed at the lower end of the furnace body (1); An oxygen supply unit, the oxygen supply unit includes a main flow pipe (2), one end of the main flow pipe (2) is located on the central axis of the cavity, and the other end of the main flow pipe (2) is located outside the furnace body (1); A plurality of ignition units, one end of the ignition unit is connected to one end of the main flow pipe (2), the other end of the ignition unit is connected to the combustion chamber (5), the plurality of ignition units are at the same height, and the plurality of ignition units are evenly distributed along the circumferential direction of the furnace body (1); A detection unit, the detection unit is arranged on the inner wall of the combustion chamber (5), and the detection unit is used for detecting the smoldering state in the combustion chamber (5).

2. The flameless combustion furnace according to claim 1, wherein The ignition unit includes: a first branch pipe (3), a heater and a first temperature measurement point (31), the first branch pipe (3) is connected with a first control valve, both ends of the first branch pipe (3) are respectively connected to the main flow pipe (2) and the combustion chamber (5) to be used for transmitting the oxygen in the main flow pipe (2) to the combustion chamber (5), the heater and the first temperature measurement point (31) are both installed on the first branch pipe (3), the first temperature measurement point (31) is located between the heater and the combustion chamber (5), the heater is used for heating the gas in the first branch pipe (3), and the first temperature measurement point (31) is used for detecting 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 includes a plurality of second branch pipes (4), the second branch pipes (4) are connected with second control valves, both ends of the second branch pipes (4) are respectively connected to the main flow pipe (2) and the combustion chamber (5), the plurality of second branch pipes (4) are evenly spaced along the circumferential direction of the combustion chamber (5), the plurality of second branch pipes (4) are at the same height, and the second branch pipes (4) are located below the ignition unit.

4. The flameless combustion furnace according to claim 3, wherein 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) all include a plurality of second temperature measurement points, and the plurality of second temperature measurement points are spaced along the circumferential direction of the combustion chamber (5).

5. The flameless combustion furnace according to claim 4, 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 they correspond one by one.

6. The flameless combustion furnace according to claim 1, wherein A cone structure is provided at the top of the cavity, and the feeding port (11) is located above the vertex of the cone structure.

7. A control method for a flameless combustion furnace, characterized in that, Using the flameless combustion furnace as described in any one of claims 1-6, comprising the following steps: S1. Add fuel into the combustion chamber (5) so that the fuel covers and is higher than the ignition unit; S2. Add the mixture of heat storage material, fuel and solid waste into the fuel in a staged manner; S3. Use the ignition unit to supply high-temperature hot air into the combustion chamber (5) to make the fuel smolder, and at the same time dry the mixture above the fuel; S4. The oxygen supply unit continuously supplies oxygen into the combustion chamber (5); S5. The detection unit detects the smoldering state in the combustion chamber, and according to the detection result, drives the corresponding ignition unit to start 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.

8. The control method of the flameless combustion furnace according to claim 7, characterized in that, In S5, if the detection unit detects that some areas are not smoldering, the ignition unit is controlled to ignite these areas; if it is detected that the smoldering in a certain vertical area is slow, the oxygen supply to this area is increased.

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