Fly ash pyrolysis furnace and method for monitoring and controlling material temperature

Abstract

The present application relates to household garbage and fly ash processing technology field, especially a fly ash pyrolysis furnace and a method for monitoring and controlling material temperature, the feeding mechanism is installed in the furnace body, realizing no dust in the furnace body; The end sealing assembly is connected with both ends of the furnace body, realizing high sealing performance; The heating device is installed below the furnace body, realizing good heat preservation effect, low heating energy consumption effect, multiple temperature measuring devices are evenly distributed along the circumference of the kiln body of the furnace body, the material temperature in the furnace body is calculated, the number N of temperature measuring devices is positively correlated with the diameter D of the kiln body of the furnace body, according to the equipment size and the material transmission rate, combined with the temperature measuring point, the material temperature in the furnace is calculated, realizing the technical effect of precise temperature control; By controlling the rotation speed of the furnace and the opening of the cooling water valve, the rotation speed of the furnace and the cooling water flow are cooperatively controlled, the material temperature in the furnace is accurately controlled, and the technical effect of precise temperature control is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household garbage and fly ash processing, in particular to a fly ash pyrolysis furnace and a method for monitoring and controlling material temperature. BACKGROUND

[0002] Fly ash is a fine particle powder collected from the flue gas purification system (such as a bag filter) after municipal solid waste incineration. Fly ash has complex composition, containing high concentrations of heavy metals (such as lead, cadmium, mercury, chromium, etc.) and persistent organic pollutants (such as dioxins). Therefore, it is listed as hazardous waste (HW18) and cannot be directly landfilled, and must be subjected to strict harmless treatment.

[0003] Fly ash pyrolysis furnace is a high-temperature treatment equipment specially used for treating fly ash from waste incineration. It heats the fly ash to a certain temperature (usually 400-600℃) in an oxygen-deficient or oxygen-free environment, causing thermal decomposition of organic pollutants (dioxins) therein and promoting heavy metal stabilization, successfully converting hazardous waste into general solid waste or safe landfill for resource utilization, thereby realizing harmless and reduction treatment of fly ash and creating conditions for subsequent resource utilization.

[0004] The prior art is realized by vertical furnace and horizontal furnace using sealed heating, but the prior art has the disadvantages of poor sealing stability of the equipment, large dusting of fly ash in the furnace, low heating efficiency, and inaccurate control due to uneven temperature detection, etc. The above-mentioned shortcomings will cause:

[0005] 1) Air leakage in the furnace, resulting in poor fly ash pyrolysis dioxin effect and no decomposition of dioxin;

[0006] 2) Large dusting of fly ash, resulting in high dust content in fly ash;

[0007] 3) High heat dissipation of existing furnace type, resulting in energy waste;

[0008] 4) Uneven temperature detection leading to inaccurate control of the furnace. SUMMARY

[0009] The technical problem to be solved by the present application is to solve the problems of the prior art in the above background technology, and to provide a fly ash pyrolysis furnace with good sealing, low fly ash dusting in the furnace, and small heat dissipation of the furnace, and a method for monitoring and controlling material temperature.

[0010] The technical solution adopted by the present application to solve the technical problem is: a fly ash pyrolysis furnace, comprising

[0011] a furnace body, which is filled with material in the kiln body, as the core container and heat exchanger for fly ash pyrolysis reaction, and the kiln body is heated to transfer heat to the internal fly ash material;

[0012] The feeding mechanism is installed in the kiln body, and the material is stirred little during rotation, and fly ash is pushed from one side to the other side during screwing, and the fly ash advances relatively statically, so that no dust is generated in the kiln body, and the temperature of the two ends of the feeding mechanism is less than or equal to 50 degrees;

[0013] The end sealing assembly is a mechanical sealing water cooling system, which is connected with the two ends of the kiln body, and is used to seal the gap between the feeding mechanism and the kiln body, and maintain the sealing environment in the kiln body.

[0014] The heating device is installed below the kiln body, and is used to heat the kiln body with low heating energy consumption.

[0015] A plurality of temperature measuring devices are uniformly distributed along the circumference of the kiln body of the kiln body, and form temperature measuring points, which are used to measure the temperature of each temperature measuring point and calculate the temperature of the material in the kiln, and the number N of the temperature measuring devices is positively correlated with the diameter D of the kiln body, so as to ensure the measurement accuracy and optimize the cost.

[0016] Further, the feeding mechanism comprises

[0017] The spiral shaft is installed along the length direction of the kiln body.

[0018] The spiral blade is arranged along the length of the shaft of the spiral shaft, and forms an upper rotating part and a lower rotating part on the spiral shaft, so as to realize stable and continuous conveying of the material from the inlet to the outlet, and a reinforcing rod is arranged between the inner rotating surface of the spiral blade and the spiral shaft, so as to increase the strength of the spiral blade.

[0019] The dust blocking buffer is installed at the connection between the upper rotating part and the lower rotating part of the spiral blade on the spiral shaft, and is symmetrically arranged upward and downward, so as to reduce the impact and flying of the fly ash during stirring.

[0020] Further, the dust blocking buffer comprises

[0021] The connecting rod is installed on the spiral shaft.

[0022] The dust blocking buffer head is installed at the end of the connecting rod, and one end of the dust blocking buffer head is a wedge-shaped head, which is used to guide the fly ash to reduce the vertical movement of the fly ash, and the directions of the wedge-shaped heads on the upper and lower dust blocking buffers are opposite, which effectively press the fly ash material to the central spiral area, greatly inhibit the upward movement and scattering of the material during stirring and pushing, so as to realize relatively static pushing, and meet the special processing requirements of the fly ash which is light and easy to fly dust.

[0023] Further, the end sealing assembly comprises a mechanical sealing element, which is used to realize the basic sealing between the rotating spiral shaft and the fixed kiln body, and a

[0024] The water circulation cooling assembly comprises a water pump, a flow meter, a pressure gauge and a radiator which are integrally assembled in a module manner, and the water pump is arranged in a water tank.

[0025] The cooling water pipeline is installed at both ends of the water circulation cooling assembly and connected with both ends of the feeding mechanism.

[0026] Further, the outer peripheral wall of the kiln body is wrapped with an outer thermal insulation layer.

[0027] A method for monitoring and controlling the temperature of the material, comprising the fly ash pyrolysis furnace according to any one of the above, and the specific steps are as follows:

[0028] Step 1: obtaining the detection values from a plurality of temperature measuring devices distributed along the circumference of the kiln body of the kiln body;

[0029] Step 2: determining a grouping strategy according to the kiln body of the kiln body, and dividing the detection values into an upper region group and a lower region group;

[0030] Step 3: based on the detection values of the upper region group and the lower region group, combining the filling geometric parameters of the material, and calculating the center temperature T of the material through a preset temperature calculation model;

[0031] Step 4: according to the calculated center temperature T of the material, the control instructions for adjusting the rotation speed of the kiln body and the control instructions for adjusting the opening degree of the cooling water valve in the end sealing assembly are generated by the comprehensive calculation of the fuzzy control and PID control algorithm.

[0032] Further, the calculation model of the center temperature T of the material is:

[0033] ;

[0034] wherein, is the average temperature of the lower region temperature measuring point; is the average temperature of the upper region temperature measuring point; y is the centroid position of the material in the vertical direction, H is the filling height of the material; k is a correction coefficient; and R is the radius of the kiln.

[0035] Further, the centroid position y of the material in the vertical direction is obtained by a geometric model, and the centroid position formula of the material is: ;

[0036] wherein, α is the central angle corresponding to the material filling region.

[0037] Further, the filling height H of the material is 1 / 4 to 1 / 2 of the diameter of the kiln body of the kiln body.

[0038] Further, it further comprises a fly ash pyrolysis furnace start-stop control logic:

[0039] When starting, the heating device is started only after the rotation speed of the kiln body reaches the preset heating triggering condition;

[0040] When stopping, after stopping heating, the delay stopping program is executed, and the kiln body temperature is continuously detected until the temperature drops to a safety threshold and the delay ends, and then the kiln body operation is stopped.

[0041] The beneficial effects of the present application are:

[0042] (1) The present application adds an end sealing assembly, which is a mechanical sealing water cooling system, to solve the technical problem of air leakage caused by equipment expansion during heating, and to achieve high sealing performance.

[0043] (2) The present application adds an in-furnace feeding mechanism to solve the technical problem of fly ash dusting during fly ash pyrolysis in the rotary kiln, and to achieve no dusting in the kiln body.

[0044] (3) The present application adds a heating device, and an external insulation layer between the heating device and the equipment, to solve the technical problems of large heat dissipation and poor insulation performance of the kiln body, and to achieve good insulation effect and low heating energy consumption.

[0045] (4) The present application adds a matrix temperature measuring device to measure the temperature of the material in the furnace according to the size of the equipment and the material transmission rate, combined with temperature measuring points, to solve the technical problems of uneven temperature measurement of the kiln and poor material pyrolysis effect, and to achieve the technical effect of precise temperature control.

[0046] (5) The present application controls the rotation speed of the kiln and the opening of the cooling water valve to cooperatively control the rotation speed of the kiln and the flow of cooling water, accurately controls the temperature of the material in the furnace, solves the technical problems of avoiding frequent speed adjustment of the kiln equipment, reducing the failure rate of the kiln, avoiding noise pollution caused by high-speed rotation of the kiln, improving working conditions, and reducing the waste of energy and water resources, and achieves the technical effect of precise temperature control. BRIEF DESCRIPTION OF DRAWINGS

[0047] The present application will be further described below in conjunction with the drawings and examples.

[0048] Figure 1 is a structural schematic diagram of the fly ash pyrolysis furnace of the present application;

[0049] Figure 2 is a structural schematic diagram of the in-kiln body feeding mechanism of the present application;

[0050] Figure 3 is a temperature control logic block diagram of the present application;

[0051] Figure 4 is a structural schematic diagram of the kiln body with a diameter D < 0.9 m of Example 1 of the present application;

[0052] Figure 5 is the control logic diagram of the fly ash pyrolysis furnace at start-up according to the present application;

[0053] Figure 6 is the control logic diagram of the fly ash pyrolysis furnace at shutdown according to the present application;

[0054] Figure 7 is the structural schematic diagram of the furnace body with a diameter of 0.9m<D<1.5m according to the embodiment 2 of the present application;

[0055] Figure 8 is the structural schematic diagram of the furnace body with a diameter of D>1.5m according to the embodiment 3 of the present application;

[0056] In the figure: 1. furnace body, 2. end sealing assembly, 3. outer insulation layer,

[0057] 4. feeding mechanism, 41. spiral shaft, 42. spiral blade, 43. dust blocking buffer, 431. connecting rod, 432. dust blocking buffer head, 44. reinforcing rod,

[0058] 5. cooling and heat dissipation mechanism, 6. cooling water pipeline, 7. heating device, 8. temperature measuring device. DETAILED DESCRIPTION

[0059] The present application will now be further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams and only schematically show the basic structure of the present application, and thus only show the components related to the present application.

[0060] Embodiment 1:

[0061] As shown in a fly ash pyrolysis furnace, comprising Figures 1-6

[0062] Furnace body 1, which is filled with materials in the kiln body, is fixed, and the materials in the furnace body 1 are filled in a non-full filling mode, and the filling height H of the materials is 1 / 4 to 1 / 2 of the diameter of the kiln body of the furnace body 1;

[0063] Feeding mechanism 4 is installed in the furnace body 1 and is a special spiral mechanism, which stirs the materials little during rotation and has no dust raising, and the fly ash is pushed from one side to the other side during the spiral process, and the fly ash advances relatively statically;

[0064] End sealing assembly 2 is connected with both ends of the furnace body 1 to seal the gap between the feeding mechanism 4 and the furnace body 1, and a water-cooled mechanical seal is adopted;

[0065] ​The heating device 7 is installed below the furnace body 1 and heats the whole furnace body 1. The heating device 7 is an electromagnetic generator, which can realize accurate temperature control, rapid response, excite the metal on the surface of the furnace body 1 to generate heat, and transfer the heat to the fly ash in the furnace body 1. This heating method is uniform, high in thermal efficiency, and fast in response, and lays a foundation for accurate temperature control.

[0066] The outer insulation layer 3 is wrapped on the outer wall of the furnace body 1 to prevent heat overflow and improve thermal efficiency. The outer insulation layer 3 mainly adopts composite magnesium aluminum silicate and other materials, which are not flammable and resistant to high temperature. The outer insulation layer 3 adopts air and layer design, and the thermal conductivity is 0.04 W / m·K.

[0067] A plurality of temperature measuring devices 8 are uniformly distributed along the circumference of the furnace body 1 to form temperature measuring points. The temperature measuring devices 8 measure the temperature of each temperature measuring point and calculate the temperature of the material in the furnace body 1. The number N of the temperature measuring devices 8 is positively correlated with the diameter D of the furnace body 1.

[0068] The temperature measuring device 8 is a temperature sensor, which is a WRGNK type thermocouple of Sichuan Instrument. The temperature sensor directly measures the temperature, and the accuracy level is I level. The absolute accuracy is ±1.5℃ or |±0.004|t, the repeatability accuracy is ±1.2℃ at 400℃, the measurement range is -40-800℃, the temperature response time is 0.2S, and the installation mode is a armored sensor inserted into the furnace wall.

[0069] As shown in Figure 2 , the feeding mechanism 4 includes

[0070] The spiral shaft 41 is installed along the length direction of the furnace body 1.

[0071] The spiral blade 42 is arranged along the length of the shaft of the spiral shaft 41 and forms upper and lower rotating parts on the spiral shaft 41. The inner rotating surface of the spiral blade 42 is provided with a reinforcing rod 44 between the spiral shaft 41.

[0072] The dust blocking buffer 43 is installed at the connection between the upper and lower rotating parts of the spiral blade 42 on the spiral shaft 41, and is symmetrically arranged upward and downward to reduce the impact and flying of the fly ash during stirring.

[0073] As shown in Figure 2 , the dust blocking buffer 43 includes

[0074] The connecting rod 431 is installed on the spiral shaft 41.

[0075] The ash blocking buffer head 432 is installed at the end of the connecting rod 431, and one end of the ash blocking buffer head 432 is a wedge-shaped head used to guide the fly ash to reduce the vertical movement of the fly ash. The wedge-shaped heads on the upper and lower ash blocking buffer members 43 are oppositely directed.

[0076] As shown in Figure 1 The end head sealing assembly 2 includes a mechanical seal, and

[0077] The water circulation cooling assembly 5 includes a modularly integrated water pump, flow meter, pressure gauge, and radiator, and the water pump is placed in the water tank.

[0078] The cooling water pipeline 6 is installed at both ends of the water circulation cooling assembly 5 and is connected to both ends of the feeding mechanism 4.

[0079] Through active cooling, the mechanical seal is prevented from failing and burning due to heat generated by high temperature in the furnace and rotational friction, and the sealing performance is stable under long-term high temperature operation.

[0080] The cooling water circulates in the system to keep the end head temperature ≤ 50°, and the sealing performance is good, and oxygen is prevented from being left in the furnace body 1;

[0081] As shown in Figures 3-6 A method for monitoring and controlling the temperature of the material includes the fly ash pyrolysis furnace according to any one of the above, and the specific steps are as follows:

[0082] Step 1: Obtain the detection values from the multiple temperature measuring devices 8 distributed along the circumference of the furnace body of the furnace body 1;

[0083] Step 2: According to the furnace body of the furnace body 1, determine the grouping strategy, and divide the detection values into an upper region group and a lower region group;

[0084] Step 3: Based on the detection values of the upper region group and the lower region group, combined with the filling geometric parameters of the material, the central temperature T of the material is calculated through a preset temperature calculation model;

[0085] Step 4: According to the calculated central temperature T of the material, the control instructions for adjusting the rotation speed of the furnace body 1 and the control instructions for adjusting the opening degree of the cooling water valve in the end head sealing assembly 2 are generated through the comprehensive calculation of the fuzzy control and PID control algorithms, so that the rotation speed of the furnace and the flow of the cooling water are cooperatively controlled, the material temperature in the furnace is accurately controlled, the frequent speed adjustment of the furnace equipment is avoided, the furnace failure rate is reduced, the noise pollution caused by the high-speed rotation of the furnace is avoided, the working conditions are improved, the energy and water resource waste technical problems are reduced, and the precise temperature control technical effect is achieved.

[0086] The calculation model of the central temperature T of the material is:

[0087] ;

[0088] wherein, is the average temperature of the lower zone temperature measurement points; is the average temperature of the upper zone temperature measurement points; D is the diameter of the furnace; y is the vertical centroid position of the material; H is the material filling height; k is the correction coefficient; R is the radius of the furnace.

[0089] The vertical centroid position of the material y is obtained by a geometric model, and the formula of the centroid position of the material is: ;

[0090] wherein, a is the central angle corresponding to the material filling area.

[0091] The correction coefficient k is in the range of 0.2-0.4, and in the process of fly ash pyrolysis, in order to realize accurate estimation of the temperature of the material, the actual temperature distribution of the material in the furnace body 1 can be more accurately reflected.

[0092] Correction coefficient k: this is an empirical coefficient between 0 and 1.

[0093] k = 0: degenerate to one-dimensional model.

[0094] k ≈ 0.2-0.4: this is a reasonable range. For this specific geometry of H / R = 2 / 3, it is recommended to take k ≈ 0.3

[0095] This coefficient reflects the degree of influence of the radial heat flow. The more "stout" the cylinder (the smaller H / R), the greater the value of k should be.

[0096] As shown in Figure 4 , taking the furnace body diameter D < 0.9 m as an example, the temperature measurement points are 4, the angle is 60°, the material in the furnace body 1 adopts a non-full filling mode, the filling area is 1 / 3D at the bottom, and the center temperature of the material is:

[0097] .

[0098] It also includes the start-stop control logic of the fly ash pyrolysis furnace:

[0099] As shown in Figure 5 , when starting, the heating device 7 is started only after the furnace body 1 reaches the preset heating trigger condition, specifically: starting the fly ash pyrolysis furnace through the control screen or through the electric control box button, at the same time detecting whether the equipment has a fault, starting the pyrolysis furnace after meeting the requirements, running at the set speed, when running to a certain speed (the speed can be set), heating the furnace body 1, and the furnace body 1 control can select the temperature mode and the constant speed mode.

[0100] As Figure 6 shown, at shutdown, after stopping heating, a delay shutdown program is executed, and the furnace body 1 temperature is continuously detected until the temperature drops to a safety threshold and the delay ends, and then the furnace body operation is stopped. Specifically: after the pyrolysis furnace is discharged, the furnace heating is stopped, and then the delay shutdown is used, and the furnace is stopped after the temperature drops to within 30°C.

[0101] Working process:

[0102] Step 1: Send a start command through the control screen or the electrical control box. The system first performs a self-check to confirm that the feeding mechanism 4, the heating device 7, the end sealing assembly 2, the temperature measuring device 8, etc. are fault-free.

[0103] Start the water circulation cooling assembly 5 in the end sealing assembly 2. The water pump starts working, and the cooling water circulates through the cooling water pipeline 6 to continuously cool the mechanical seal, ensuring that the end temperature is ≤50°C, and establishing a reliable sealing environment.

[0104] Step 2: Start the drive device (such as a motor) of the feeding mechanism 4. The screw shaft 41 starts rotating at a low speed, and the fly ash material enters the furnace body 1 from the feeding port.

[0105] Step 3: The rotating screw blade 42 smoothly pushes the fly ash from the feeding side to the discharging side. Due to the particularity of the screw design, the material advancing process is relatively static, avoiding violent tumbling. In this process, the ash-blocking buffer 43 installed at the connection of the screw blade 42 plays a key role. Its symmetrical up and down and wedge-shaped head facing opposite directions can effectively guide and block the raised fly ash, pressing the fly ash to the central conveying channel, thereby significantly reducing the vertical movement and impact of the fly ash, achieving a small stirring and no dust conveying effect.

[0106] Step 4: When the furnace body 1 reaches the preset rotating speed, the heating device 7 starts. It excites the metal furnace body of the furnace body 1 to generate heat, and the heat is uniformly transmitted inward. The outer insulation layer 3 wrapped outside the furnace body effectively prevents heat overflow, improves heat efficiency, and protects the heating device 7 from overheating.

[0107] Step 5: The multiple temperature measuring devices 8 evenly distributed in the circumference real-time monitor the temperature at different positions of the furnace wall. The number of measuring points N is determined according to the diameter D of the furnace body, ensuring the accuracy of temperature monitoring for different scale equipment.

[0108] Step 6: The control system collects these temperature values and, according to the preset grouping strategy and temperature calculation model, combines the filling geometric parameters (such as the centroid position y) of the material to real-time calculate the center temperature T of the material.

[0109] Step 7: The control system compares the calculated material center temperature T with the target temperature set by the process, and obtains the deviation;

[0110] Based on this deviation, the system uses a comprehensive algorithm combining fuzzy control and PID control to generate control instructions collaboratively;

[0111] The rotational speed of the feeding mechanism 4 and the opening of the cooling water valve are dynamically adjusted, and through the collaborative adjustment of the two, the pyrolysis of the material is completed at the optimal temperature and reaction time, ensuring the treatment effect and improving energy efficiency;

[0112] Step 8: The treated fly ash is pushed by the feeding mechanism 4 to the discharge outlet;

[0113] Step 9: After the discharge is completed, first stop the heating device 7, the kiln body 1 and the feeding mechanism 4 continue to run, and the cooling water system continues to work, which is a delay shutdown program, the purpose is to make the equipment uniformly cool down under stirring and cooling;

[0114] The system continues to monitor the furnace temperature, and only when the temperature drops below the safety threshold (such as 30℃) and the delay time ends, the feeding mechanism 4 and the cooling water system are stopped, and the whole process is safely completed.

[0115] As can be seen, the kiln material temperature control uses a new control process of collaborative control of kiln body 1 speed and cooling water, through the comprehensive calculation of fuzzy control and PID control algorithm, and matching the kiln speed and cooling water flow, it avoids the defects of pure kiln body 1 speed control and the noise pollution caused by the too fast speed of kiln body 1, improves the working environment of workers, and avoids the energy loss and low efficiency caused by pure cooling water cooling during the heating process of the body 1.

[0116] Example 2:

[0117] The difference from Example 1 is that, as shown in Figure 7 , 0.9m < D < 1.5m, the temperature measuring points are 6 evenly distributed, the angle is 60°, the material in the kiln body 1 adopts non-full filling method, the filling area is 1 / 3D at the bottom, and the material center temperature T:

[0118] .

[0119] Example 3:

[0120] The difference from Example 1 is that, as shown in Figure 8 , D > 1.5m, the temperature measuring points are 8 evenly distributed, the angle is 45°, the material in the kiln body 1 adopts non-full filling method, the filling area is 1 / 3D at the bottom, and the material center temperature T:

[0121] .

[0122] The above-described embodiments according to the present application are merely exemplary and are not intended to limit the present application. A person skilled in the art can make various changes and modifications of the present application without departing from the spirit and scope of the present application. The technical scope of the present application should be determined by the following claims.

Claims

1. A method of monitoring and controlling the temperature of material in a fly ash pyrolysis furnace, the method comprising: The fly ash pyrolysis furnace comprises ​ A furnace body (1) filled with materials; A feeding mechanism (4) installed in the furnace body (1) and capable of stirring the materials with little dust during rotation and pushing the fly ash from one side to the other side during screwing, and the fly ash advancing process being relatively static; An end sealing assembly (2) connected to both ends of the furnace body (1) and used for sealing the gap between the feeding mechanism (4) and the furnace body (1); A heating device (7) installed below the furnace body (1) and used for heating the furnace body (1); A plurality of temperature measuring devices (8) uniformly distributed along the circumference of the furnace body (1) to form temperature measuring points, used for measuring the temperature of each temperature measuring point and calculating the temperature of the materials in the furnace body (1), and the number N of the temperature measuring devices (8) being positively correlated with the diameter D of the furnace body (1). The specific steps are as follows: Step 1: obtaining the detection values from the plurality of temperature measuring devices (8) distributed along the circumference of the furnace body (1); Step 2: determining a grouping strategy according to the furnace body (1) to divide the detection values into an upper region group and a lower region group; Step 3: calculating the center temperature T of the materials by a preset temperature calculation model based on the detection values of the upper region group and the lower region group and in combination with the filling geometric parameters of the materials; Step 4: generating a control instruction for adjusting the rotating speed of the furnace body (1) and a control instruction for adjusting the opening degree of the cooling water valve in the end sealing assembly (2) by the comprehensive calculation of the fuzzy control and PID control algorithms according to the calculated center temperature T of the materials.

2. A method of monitoring and controlling the material temperature in a fly ash pyrolysis furnace as claimed in claim 1, wherein: The feeding mechanism (4) comprises A spiral shaft (41) installed along the length direction of the furnace body (1); Spiral blades (42) arranged along the length of the shaft body of the spiral shaft (41) and forming upper and lower rotating parts on the spiral shaft (41); Ash blocking and buffering members (43) symmetrically arranged above and below the connection between the upper and lower rotating parts of the spiral blades (42) and used for reducing the impact and flying of the fly ash during stirring.

3. A method of monitoring and controlling the material temperature of a fly ash pyrolysis furnace as claimed in claim 2, wherein: The ash blocking and buffering members (43) comprise A connecting rod (431) installed on the spiral shaft (41); Ash blocking and buffering heads (432) installed at the ends of the connecting rod (431), one end of each ash blocking and buffering head (432) being a wedge-shaped head used for guiding the fly ash to reduce the vertical movement of the fly ash, and the wedge-shaped heads on the upper and lower ash blocking and buffering members (43) being oppositely directed.

4. A method of monitoring and controlling the material temperature of a fly ash pyrolysis furnace as claimed in claim 1, wherein: The end sealing assembly (2) comprises a mechanical sealing member and a water circulation heat dissipation assembly (5) used for cooling the mechanical sealing member, the water circulation heat dissipation assembly (5) comprising a water pump, a flow meter, a pressure gauge and a radiator assembled in a modular and integrated manner, and the water pump being placed in a water tank. Cooling water pipes (6) installed at both ends of the water circulation heat dissipation assembly (5) and connected to both ends of the feeding mechanism (4). The outer circumferential wall of the furnace body (1) is wrapped with an outer insulation layer (3).

5. A method of monitoring and controlling the material temperature of a fly ash pyrolysis furnace as claimed in claim 1, wherein: The calculation model of the center temperature T of the materials is as follows:

6. A method of monitoring and controlling the material temperature of a fly ash pyrolysis furnace as claimed in claim 1, wherein: Wherein, α is the central angle corresponding to the material filling area. ； wherein, T is the average temperature of the lower zone temperature measurement points; T is the average temperature of the upper zone temperature measurement points; y is the vertical position of the mass centroid; H is the mass fill height; k is a correction factor; and R is the radius of the furnace.

7. A method of monitoring and controlling the material temperature of a fly ash pyrolysis furnace as claimed in claim 6, wherein: The centroid position y of the material in the vertical direction is obtained by a geometric model calculation, and the centroid position formula of the material is: ; ​ 8. A method of monitoring and controlling the material temperature of a fly ash pyrolysis furnace as claimed in claim 6, wherein: The filling height H of the material is 1 / 4 to 1 / 2 of the kiln body diameter of the kiln body (1).

9. A method of monitoring and controlling the material temperature of a fly ash pyrolysis furnace as claimed in claim 1, wherein: The fly ash pyrolysis furnace start-stop control logic is also included: When starting, the heating device (7) is started only after the rotation speed of the kiln body (1) reaches the preset heating trigger condition; When stopping, after stopping heating, the delay stop program is executed, and the temperature of the kiln body (1) is continuously detected until the temperature drops to a safety threshold and the delay ends, and then the operation of the kiln body (1) is stopped.

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