Equipment and process for removing dioxin by pyrolyzing fly ash at low temperature

Abstract

The invention discloses equipment and a process for removing dioxin through fly ash low-temperature pyrolysis. The equipment comprises a supporting structure, a fly ash conveying mechanism and a pyrolysis heating mechanism, wherein the fly ash conveying mechanism and the pyrolysis heating mechanism are arranged in the supporting structure; the supporting structure comprises a cylindrical main body supporting shell which is vertically arranged in an extending manner and is hollow inside; the fly ash conveying mechanism comprises a fly ash conveying pipe shell which is coaxially arranged in the main body supporting shell and is provided with a downward opening, a conveying driving pipe shell which is coaxially arranged with the fly ash conveying pipe shell and is provided with a downward opening is rotationally connected in the fly ash conveying pipe shell, and a fly ash conveying channel is formed between the inner side wall of the fly ash conveying pipe shell and the outer side wall of the conveying driving pipe shell; the pyrolysis heating mechanism comprises a plurality of microwave generators arranged on the inner side wall of the main body supporting shell; efficient pyrolysis and conveying work cooperatively, it is ensured that the retention time of fly ash in a pyrolysis area is controllable in a fly ash conveying channel, meanwhile, the multiple microwave generators directly conduct low-temperature heating on the fly ash in the channel, the fly ash is heated more evenly, and the dioxin removal efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pyrolysis of incineration fly ash, in particular to equipment and a process for removing dioxins by low-temperature pyrolysis of fly ash. Background Art

[0002] Incineration fly ash (including hazardous waste incineration fly ash and domestic waste incineration fly ash) is the solid residue generated after the incineration of garbage or hazardous waste. Because it contains harmful substances such as heavy metals, dioxins, and soluble salts, it is usually classified as hazardous waste and requires strict treatment to avoid environmental pollution. Pyrolysis is a harmless and resource-based treatment technology for this type of fly ash.

[0003] Specifically, in an oxygen-free or oxygen-deficient environment, fly ash is heated to a certain temperature (usually 400-1000°C) to decompose, volatilize, or transform the organic pollutants (such as dioxins, polycyclic aromatic hydrocarbons, etc.) and some inorganic components. Unlike incineration (oxidative decomposition in an oxygen-free environment), pyrolysis achieves material transformation by breaking chemical bonds at high temperatures. The products usually include gases (such as methane, hydrogen, carbon monoxide), liquids (tars), and solid residues (inorganic minerals, stabilized heavy metals, etc.);

[0004] However, the existing equipment pyrolysis technology is still lacking in stability, pollutant removal effect, etc., and needs further improvement and optimization. Summary of the Invention

[0005] The object of the present invention is to provide an apparatus and process for removing dioxins by low-temperature pyrolysis of fly ash, so as to make the fly ash heated more evenly and improve the dioxin removal efficiency.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A device for removing dioxins by low-temperature pyrolysis of fly ash, comprising a support structure, a fly ash transport mechanism disposed within the support structure, and a pyrolysis heating mechanism;

[0008] The supporting structure includes a cylindrical main body supporting shell which is vertically extended and hollow inside;

[0009] The fly ash transmission mechanism includes a fly ash transmission tube shell coaxially arranged in the main support shell and with an opening facing downward, a transmission drive tube shell coaxially arranged and with an opening facing downward is rotatably connected in the fly ash transmission tube shell, and a fly ash transmission channel is formed between the inner side wall of the fly ash transmission tube shell and the outer side wall of the transmission drive tube shell;

[0010] A plurality of transmission drive spiral plates spirally extending around the axis thereof are fixed to the outer side wall of the transmission drive tube housing;

[0011] The upper end of the fly ash transmission channel is connected to a plurality of fly ash initial input pipes;

[0012] The transmission driving tube shell forms a flue gas collection chamber inside, and the transmission driving tube shell has a plurality of flue gas through holes on the side wall, which are in communication with the outside, and the diameter of the flue gas through hole is 0.1-1μm;

[0013] A plurality of flue gas exhaust pipes are fixed through the side wall of the main body support shell, and one end of the flue gas exhaust pipe in the main body support shell is in communication with the flue gas collection chamber;

[0014] The pyrolysis heating mechanism includes a plurality of microwave generators arranged on the inner side wall of the main body support shell.

[0015] Preferably, the fly ash transmission tube shell is fixed with a transmission driving containing shell at the top, and a transmission driving connecting hole in communication with the inside of the transmission driving containing shell is vertically arranged through the top of the fly ash transmission tube shell, and a vertically extending and hollow transmission driving tube shaft is rotatably connected in the transmission driving connecting hole, and the lower end of the transmission driving tube shaft is fixedly connected with the top of the transmission driving tube shell.

[0016] One end of the transmission driving tube shaft in the transmission driving containing shell is fixed with a driven gear, and a transmission driving motor is fixed in the transmission driving containing shell, and a driving gear is fixed on the output shaft of the transmission driving motor, and the driving gear is in meshing connection with the driven gear.

[0017] A flue gas exhaust hole in communication with the inside of the transmission driving tube shaft is vertically arranged through the top of the transmission driving tube shell.

[0018] One end of the flue gas exhaust pipe in the main body support shell is in communication with the inside of the transmission driving containing shell.

[0019] Description: The output shaft of the transmission driving motor drives the transmission driving tube shaft to rotate through the meshing connection of the driving gear and the driven gear, and the transmission driving tube shaft in turn drives the transmission driving tube shell to rotate.

[0020] Preferably, an auxiliary heating mechanism is arranged in the transmission driving tube shell, and the auxiliary heating mechanism includes an auxiliary heating support column coaxially arranged in the transmission driving tube shell, and a plurality of auxiliary heating containing grooves are arranged on the outer side wall of the auxiliary heating support column, and an electric heating plate is fixed in the auxiliary heating containing groove.

[0021] The heating surface of the electric heating plate faces the inner side wall of the transmission driving tube shell.

[0022] A vertically extending support connecting shaft is fixed at the top of the auxiliary heating support column, and the upper end of the support connecting shaft extends upward through the transmission driving tube shaft and is fixedly connected with the top of the transmission driving containing shell.

[0023] Description: A plurality of electric heating plates are turned on, and the fly ash in the fly ash transmission channel is heated by using the effect of heat radiation, so that the fly ash in the fly ash transmission channel is heated more uniformly.

[0024] Preferably, the transmission driving pipe shell is provided with a driven flow guide mechanism, which comprises a flow guide rotating ring rotationally connected to the top of the transmission driving pipe shell and coaxially arranged therewith, and a flow guide driving spiral plate fixed to the lower side of the flow guide rotating ring and spirally extending downward along the axis of the transmission driving pipe shell.

[0025] The flow guide driving spiral plate spirally surrounds the periphery of the auxiliary heat support column.

[0026] Description: The flue gas in the flue gas collection chamber is driven by the driven flow guide mechanism to flow upward, so as to be more smoothly discharged.

[0027] Preferably, the fly ash initial input pipe is connected to the fly ash transmission channel through a circumferential distribution mechanism, which comprises a plurality of fly ash dispersion communication shells fixed to the top of the fly ash transmission pipe shell and uniformly and dispersedly arranged around the circumference of the fly ash transmission pipe shell.

[0028] The lower end of the fly ash dispersion communication shell is connected to the fly ash transmission channel through a vertically penetrating fly ash input communication groove, and the upper end of the fly ash dispersion communication shell is connected to the fly ash initial input pipe.

[0029] The fly ash dispersion communication shell has a plurality of dispersed flow guide plates inside.

[0030] Description: The fly ash in the fly ash initial input pipe first enters the fly ash dispersion communication shell, and the fly ash freely falls in the fly ash dispersion communication shell and enters the fly ash transmission channel through the fly ash input communication groove under the flow guide action of the plurality of dispersed flow guide plates, so that the fly ash can be more uniformly and dispersedly arranged on the circumference of the fly ash transmission channel when input.

[0031] Preferably, the lower end of the main body support shell is erected on the ground through a support frame.

[0032] The lower end of the fly ash transmission pipe shell is fixed with an outwardly open and inverted conical outward discharge flow guide cone shell, and the lower end of the outward discharge flow guide cone shell is connected to a vertically extending fly ash outward discharge pipe, and the lower end of the fly ash outward discharge pipe extends to the outside of the main body support shell.

[0033] The lower end of the transmission driving pipe shell is fixed with an upwardly open sealing cone shell.

[0034] A fly ash temporary storage pool is arranged below the fly ash outward discharge pipe and has an upward opening.

[0035] Description: The fly ash after pyrolysis treatment is discharged from the lower end of the fly ash transmission channel, enters the outward discharge flow guide cone shell, and then is discharged through the fly ash outward discharge pipe and falls into the fly ash temporary storage pool for storage.

[0036] Preferably, the microwave generator is connected with the inner side wall of the main support shell through a circumferential driving mechanism, the circumferential driving mechanism comprises a plurality of circumferential driving support rings fixed on the inner side wall of the main support shell, the inner side of the circumferential driving support ring is rotationally connected with a circumferential driving rotating ring coaxially arranged with the circumferential driving support ring, and the inner side of the circumferential driving rotating ring is fixed with a plurality of bowl-shaped microwave reflection shells, and the microwave generator is fixed in the microwave reflection shell.

[0037] The circumferential driving support ring is coaxially arranged with the main support shell, and the plurality of circumferential driving support rings are arranged along the axial direction of the main support shell.

[0038] The opening direction of the microwave reflection shell is towards the side of the central axis of the main support shell.

[0039] Description: The circumferential driving mechanism drives each microwave generator to periodically rotate circumferentially around the main support shell, so that the heating of the fly ash by the microwave generator is more uniform.

[0040] Preferably, a process for removing dioxin from fly ash by low-temperature pyrolysis based on the above-mentioned device for removing dioxin from fly ash by low-temperature pyrolysis comprises the following steps:

[0041] S1, fly ash input:

[0042] Use an external screw conveyor pump to input fly ash with a water content of 5% into the fly ash transmission channel through the fly ash initial input pipe;

[0043] The transmission drive motor drives the transmission drive shell to rotate, and the transmission drive shell rotates together with a plurality of transmission drive spiral plates. Under the driving of the plurality of transmission drive spiral plates, the fly ash moves from top to bottom in the fly ash transmission channel;

[0044] S2, microwave pyrolysis of fly ash:

[0045] Turn on the plurality of microwave generators, use the microwave heating effect to heat the fly ash in the fly ash transmission channel to 400-450℃, and perform pyrolysis treatment on the fly ash, and the residence time of the fly ash in the fly ash transmission channel is 40-50min;

[0046] S3, auxiliary heating of fly ash:

[0047] During the process of step S2, a plurality of electric heating plates are turned on, and the fly ash in the fly ash transmission channel is heated by using the heat radiation effect, so that the fly ash in the fly ash transmission channel is heated more uniformly;

[0048] S4, flue gas exhaust:

[0049] The flue gas generated by the pyrolysis of the fly ash in the fly ash transmission channel will enter the flue gas collection chamber through the flue gas through holes on the side wall of the transmission drive shell, and the flue gas in the flue gas collection chamber will be discharged through a plurality of flue gas exhaust pipes;

[0050] S5, fly ash output after pyrolysis:

[0051] The fly ash after pyrolysis treatment is discharged from the lower end of the fly ash transmission channel into the outer discharge guide cone shell, and the fly ash in the outer discharge guide cone shell is discharged through the fly ash outer discharge pipe and falls into the fly ash temporary storage pool for storage.

[0052] Compared with the prior art, the beneficial effects of the present application are reflected in the following aspects:

[0053] 1. The structure design of the present application is reasonable, and the efficient pyrolysis and transmission work cooperatively, the transmission drive spiral plate extending spirally around the transmission drive pipe shell axis is arranged in the fly ash transmission channel, when the transmission drive pipe shell rotates, the spiral plate can push the fly ash to move down stably along the channel, ensuring that the residence time of the fly ash in the pyrolysis area is controllable, at the same time, the multiple microwave generators inside the main support shell directly heat the fly ash in the channel at low temperature, the dynamic process of spiral transmission makes the fly ash heated more uniformly, avoiding local overheating or insufficient heating, and improving the dioxin removal efficiency;

[0054] 2. The present application is easy to operate, and the multiple path input and dispersed transmission are realized, the multiple channel input of fly ash is realized through the circumferential distribution mechanism, the multiple fly ash dispersed communication shells are arranged uniformly around the fly ash transmission pipe shell, and the internal dispersed guide plates are matched, so that the fly ash is more uniformly distributed when entering the transmission channel, local accumulation is reduced, and the heating uniformity is further ensured;

[0055] 3. In the technical scheme of the present application, a flue gas collection chamber is formed inside the transmission drive pipe shell, the flue gas generated by the pyrolysis of fly ash can be introduced into the chamber through the flue gas through holes in the side wall, and then the transmission drive pipe shaft, the transmission drive containing shell and the flue gas discharge pipe are communicated, so as to realize the closed collection and discharge of flue gas and avoid secondary pollution caused by flue gas leakage;

[0056] 4. In the technical scheme of the present application, the microwave heating is the main one, the microwave generator directly acts on the fly ash transmission channel, the microwave heating has the characteristics of strong penetration and fast heating speed, is suitable for low temperature pyrolysis demand of 300-500 DEG C, and can efficiently destroy the molecular structure of dioxin; the electric heating plate can radiate heat inward, and the microwave heating forms a synergy to ensure the stability of the pyrolysis temperature and avoid the residual dioxin in the low temperature area. BRIEF DESCRIPTION OF DRAWINGS

[0057] Figure 1 is the front view of the present application;

[0058] Figure 2 is a structural schematic view of the fly ash transmission mechanism of the present application;

[0059] Figure 3 is a structural schematic view of the active guide mechanism of the present application;

[0060] Figure 4 is a structural schematic view of the circumferential distribution mechanism of the present application;

[0061] Figure 5 is a three-dimensional view of the circumferential distribution mechanism of the present application.

[0062] In the figure, 10 - support structure, 11 - main body support shell, 12 - support frame, 13 - fly ash temporary storage pool, 20 - fly ash transmission mechanism, 201 - fly ash initial input pipe, 202 - flue gas exhaust pipe, 21 - fly ash transmission pipe shell, 210 - fly ash transmission channel, 211 - exhaust flow cone shell, 212 - fly ash exhaust pipe, 22 - transmission drive pipe shell, 2201 - flue gas through hole, 220 - flue gas collection chamber, 221 - transmission drive spiral plate, 222 - flue gas exhaust hole, 223 - airtight cone shell, 23 - transmission drive containing shell, 231 - transmission drive connecting hole, 232 - transmission drive pipe shaft, 233 - driven gear, 234 - transmission drive motor, 235 - drive gear, 24 - auxiliary heating mechanism, 241 - auxiliary heating support column, 242 - auxiliary heating containing groove, 243 - electric heating plate, 244 - support connecting shaft, 25 - active flow guide mechanism, 251 - flow guide rotating ring, 252 - flow guide drive spiral plate, 26 - circumferential distribution mechanism, 261 - fly ash dispersion communication shell, 262 - fly ash input communication groove, 263 - dispersion flow guide plate, 30 - pyrolysis heating mechanism, 31 - microwave generator, 32 - circumferential drive mechanism, 321 - circumferential drive support ring, 322 - circumferential drive rotating ring, 323 - microwave reflection shell. DETAILED DESCRIPTION

[0063] The present application will be described in detail below. Figures 1-5 For the convenience of description, the following directions are defined as follows: the up-down, left-right, front-rear directions in the following description are consistent with the up-down, left-right, front-rear directions of the respective main views or structural schematic views themselves.

[0064] Example 1: A device for removing dioxins by low-temperature pyrolysis of fly ash, as shown in Figure 1 includes a support structure 10, a fly ash transmission mechanism 20 arranged in the support structure 10, and a pyrolysis heating mechanism 30.

[0065] The support structure 10 includes a cylindrical main body support shell 11 arranged vertically and internally hollow;

[0066] As shown in Figure 1 , the fly ash transmission mechanism 20 includes a fly ash transmission pipe shell 21 coaxially arranged in the main body support shell 11 and opening downward, the fly ash transmission pipe shell 21 is fixedly connected to the inner side wall of the main body support shell 11 through a connecting plate, and a transmission drive pipe shell 22 coaxially arranged with the fly ash transmission pipe shell 21 and opening downward is rotationally connected in the fly ash transmission pipe shell 21, as shown in Figure 2As shown, the fly ash transmission channel 210 is formed between the inner side wall of the fly ash transmission pipe shell 21 and the outer side wall of the transmission driving pipe shell 22.

[0067] A plurality of prior art quartz optical fiber type temperature sensors are arranged on the outer side wall of the fly ash transmission pipe shell 21; as shown in the figure, Figure 2 As shown, a plurality of transmission driving spiral plates 221 extending spirally along the axis thereof are fixed to the outer side wall of the transmission driving pipe shell 22.

[0068] As shown in the figure, Figure 1 As shown, a plurality of fly ash initial input pipes 201 are connected to the upper end of the fly ash transmission channel 210.

[0069] As shown in the figure, Figure 2 As shown, a smoke collection chamber 220 is formed in the transmission driving pipe shell 22, and a plurality of smoke through holes 2201 are formed in the side wall of the transmission driving pipe shell 22 and communicate with the outside, and the hole diameter of the smoke through holes 2201 is 0.1 μm.

[0070] As shown in the figure, Figure 1 As shown, a plurality of smoke exhaust pipes 202 are fixedly arranged through the side wall of the main body support shell 11, and the end of the smoke exhaust pipe 202 in the main body support shell 11 is in communication with the smoke collection chamber 220.

[0071] As shown in the figure, Figure 1 As shown, the pyrolysis heating mechanism 30 includes a plurality of microwave generators 31 arranged on the inner side wall of the main body support shell 11.

[0072] The microwave generator 31 is a microwave generator of the prior art.

[0073] As shown in the figure, Figure 2 As shown, a transmission driving containing shell 23 is fixed to the top of the fly ash transmission pipe shell 21, a transmission driving connecting hole 231 vertically penetrating the top of the fly ash transmission pipe shell 21 is in communication with the inside of the transmission driving containing shell 23, a vertically extending hollow transmission driving pipe shaft 232 is rotatably connected in the transmission driving connecting hole 231, and the lower end of the transmission driving pipe shaft 232 is fixedly connected to the top of the transmission driving pipe shell 22.

[0074] A driven gear 233 is fixed to the end of the transmission driving pipe shaft 232 in the transmission driving containing shell 23, a transmission driving motor 234 is fixed in the transmission driving containing shell 23, a driving gear 235 is fixed on the output shaft of the transmission driving motor 234, and the driving gear 235 is in meshing connection with the driven gear 233.

[0075] A smoke exhaust hole 222 vertically penetrating the top of the transmission driving pipe shell 22 is in communication with the inside of the transmission driving pipe shaft 232.

[0076] The end of the smoke exhaust pipe 202 in the main body support shell 11 is in communication with the inside of the transmission driving containing shell 23.

[0077] As Figure 3 shown in the drawings, the transmission driving tube shell 22 is provided with an auxiliary heating mechanism 24, the auxiliary heating mechanism 24 includes an auxiliary heating support column 241 coaxially arranged in the transmission driving tube shell 22, the auxiliary heating support column 241 has a plurality of auxiliary heating accommodating grooves 242 on the outer side wall, and an electric heating plate 243 is fixed in each auxiliary heating accommodating groove 242;

[0078] The heating surface of the electric heating plate 243 faces the inner side wall of the transmission driving tube shell 22;

[0079] The auxiliary heating support column 241 is fixed with a vertically extending support connecting shaft 244 at the top, and the upper end of the support connecting shaft 244 extends upward through the transmission driving tube shaft 232 and is connected to the top of the transmission driving accommodating shell 23.

[0080] The support connecting shaft 244 and the auxiliary heating support column 241 have a hollow wiring groove inside, and the electric wire extends through the wiring groove to each auxiliary heating accommodating groove 242 to supply power to each electric heating plate 243;

[0081] A plurality of industrial-grade infrared temperature sensors of the prior art are arranged on the outer side wall of the auxiliary heating support column 241 to monitor the temperature on the inner side of the transmission driving tube shell 22;

[0082] As Figure 1 shown in the drawings, the lower end of the main body support shell 11 is supported on the ground through the support frame 12;

[0083] The lower end of the fly ash transmission tube shell 21 is fixed with an outwardly open and inverted conical outward discharge flow cone shell 211, and a vertically extending fly ash outward discharge pipe 212 is arranged at the lower end of the outward discharge flow cone shell 211 in communication, and the lower end of the fly ash outward discharge pipe 212 extends to the outside of the main body support shell 11;

[0084] The lower end of the transmission driving tube shell 22 is fixed with a closed conical shell 223 with an upward opening;

[0085] The fly ash outward discharge passage is formed between the outer side surface of the closed conical shell 223 and the inner side surface of the outward discharge flow cone shell 211, and the upper end of the fly ash outward discharge pipe 212 is in communication with the fly ash outward discharge passage;

[0086] The fly ash temporary storage pool 13 is arranged below the fly ash outward discharge pipe 212 with an upward opening.

[0087] Embodiment 2: The present embodiment describes a process for removing dioxin by fly ash low-temperature pyrolysis, based on the fly ash low-temperature pyrolysis device for removing dioxin described in Embodiment 1, comprising the following steps:

[0088] S1, fly ash input:

[0089] The fly ash with a water content of 5% is input into the fly ash transmission channel 210 through the fly ash initial input pipe 201 by an external screw conveying pump, and the fly ash is incineration fly ash which is washed twice and dried to a water content of 5%;

[0090] The output shaft of the transmission driving motor 234 is connected to the transmission driving pipe shaft 232 through the meshing connection of the driving gear 235 and the driven gear 233, and the transmission driving pipe shaft 232 drives the transmission driving pipe shell 22 to rotate together, and the transmission driving pipe shell 22 rotates together with the plurality of transmission driving spiral plates 221, and under the driving of the plurality of transmission driving spiral plates 221, the fly ash moves from top to bottom in the fly ash transmission channel 210;

[0091] S2, fly ash microwave pyrolysis:

[0092] A plurality of microwave generators 31 are turned on, and the fly ash in the fly ash transmission channel 210 is heated to 400 DEG C by using the microwave heating effect, and the fly ash is subjected to pyrolysis treatment, and the fly ash stays in the fly ash transmission channel 210 for 40 min;

[0093] S3, fly ash auxiliary heating:

[0094] In the process of step S2, a plurality of electric heating plates 243 are turned on, and the fly ash in the fly ash transmission channel 210 is heated by using the heat radiation effect, so that the fly ash in the fly ash transmission channel 210 is heated more uniformly;

[0095] The temperature of the fly ash in the fly ash transmission channel 210 is indirectly monitored by using the quartz optical fiber type temperature sensor on the outer side wall of the fly ash transmission pipe shell 21 and the infrared temperature sensor on the outer side wall of the auxiliary heating support column 241;S4, flue gas exhaust:

[0096] The flue gas generated by the pyrolysis of the fly ash in the fly ash transmission channel 210 will enter the flue gas collection chamber 220 through the flue gas through hole 2201 on the side wall of the transmission driving pipe shell 22, and the flue gas in the flue gas collection chamber 220 will be discharged through the plurality of flue gas exhaust pipes 202;

[0097] The flue gas in the flue gas collection chamber 220 passes through the flue gas exhaust hole 222 and penetrates the transmission driving containing shell 23 through the transmission driving pipe shaft 232, and the flue gas in the transmission driving containing shell 23 is discharged through the flue gas exhaust pipe 202;

[0098] S5, fly ash output after pyrolysis:

[0099] The fly ash after pyrolysis treatment is discharged from the lower end of the fly ash transmission channel 210 and enters the exhaust flow cone shell 211, and the fly ash in the exhaust flow cone shell 211 is discharged through the fly ash exhaust pipe 212 and falls into the fly ash temporary storage pool 13 for storage.

[0100] Embodiment 3: Based on Embodiment 1, as shown in Figure 1 The fly ash initial input pipe 201 is connected to the fly ash transmission channel 210 through the circumferential distribution mechanism 26, as shown in Figure 4 , Figure 5 The circumferential distribution mechanism 26 includes a plurality of fly ash dispersion communication shells 261 fixed on the top of the fly ash transmission pipe shell 21, which are uniformly distributed around the circumference of the fly ash transmission pipe shell 21.

[0101] The lower end of the fly ash dispersion communication shell 261 is connected to the fly ash transmission channel 210 through the vertically penetrating fly ash input communication slot 262, and the upper end of the fly ash dispersion communication shell 261 is connected to the fly ash initial input pipe 201.

[0102] The fly ash dispersion communication shell 261 has a plurality of dispersion flow guide plates 263 inside.

[0103] Embodiment 4: This embodiment describes a process for removing dioxins by fly ash low-temperature pyrolysis, based on the fly ash low-temperature pyrolysis device for removing dioxins in Embodiment 3, which is different from Embodiment 2 in that the fly ash in the fly ash initial input pipe 201 in step S1 first enters the fly ash dispersion communication shell 261, the fly ash freely falls in the fly ash dispersion communication shell 261, and passes through the flow guide effect of the plurality of dispersion flow guide plates 263 to enter the fly ash transmission channel 210 through the fly ash input communication slot 262, so that the fly ash can be more uniformly distributed around the circumference of the fly ash transmission channel 210 when input.

[0104] Embodiment 5: Based on Embodiment 3, as shown in Figure 1 The microwave generator 31 is connected to the inner side wall of the main body support shell 11 through the circumferential driving mechanism 32, the circumferential driving mechanism 32 includes a plurality of circumferential driving support rings 321 fixed on the inner side wall of the main body support shell 11, the inner side of the circumferential driving support ring 321 is rotationally connected with a coaxially arranged circumferential driving rotating ring 322, a plurality of bowl-shaped microwave reflection shells 323 are fixed on the inner side of the circumferential driving rotating ring 322, and the microwave generator 31 is fixed in the microwave reflection shell 323.

[0105] The circumferential driving support ring 321 is coaxially arranged with the main body support shell 11, and a plurality of circumferential driving support rings 321 are arranged along the axis direction of the main body support shell 11.

[0106] The circumferential driving rotating ring 322 is driven to rotate around the axis of the circumferential driving support ring 321 by a prior art servo motor fixed on the inner side wall of the main body support shell 11 through a gear and rack power transmission.

[0107] The opening direction of the microwave reflection shell 323 is towards the center axis side of the main body support shell 11.

[0108] In this embodiment, the fly ash is heated more uniformly by the microwave generators 31.

[0109] The circumferential driving rotating ring 322 is driven to rotate around the axis of the circumferential driving support ring 321 by a prior art servo motor fixed on the inner wall of the main body support shell 11 through a gear and rack transmission, and the circumferential driving rotating ring 322 in turn drives the microwave reflection shells 323 and the microwave generators 31 to rotate together. The circumferential driving rotating ring 322 rotates periodically clockwise and counterclockwise around the axis of the circumferential driving support ring 321.

[0110] In this embodiment, the fly ash is heated more uniformly by the microwave generators 31. Figure 3 As shown in FIG. 7, the transmission driving tube shell 22 is provided with a positive flow guiding mechanism 25. The positive flow guiding mechanism 25 includes a flow guiding rotating ring 251 rotatably connected to the inner top of the transmission driving tube shell 22 and coaxially arranged with the transmission driving tube shell 22. The flow guiding rotating ring 251 is fixed with a flow guiding driving spiral plate 252 extending downward spirally around the axis of the transmission driving tube shell 22.

[0111] The flow guiding driving spiral plate 252 spirally surrounds the outer periphery of the auxiliary heat support column 241.

[0112] The flow guiding rotating ring 251 is driven to rotate by a prior art motor fixed on the inner top of the transmission driving tube shell 22 through a gear drive.

[0113] In this embodiment, the fly ash is heated more uniformly by the microwave generators 31.

[0114] The flow guiding rotating ring 251 is driven to rotate by a prior art motor fixed on the inner top of the transmission driving tube shell 22 through a gear drive. The flow guiding rotating ring 251 in turn drives the flow guiding driving spiral plate 252 to rotate together. The flow guiding driving spiral plate 252 drives the flue gas to flow upward in the flue gas collection chamber 220.

[0115] In this embodiment, the fly ash is heated more uniformly by the microwave generators 31.

[0116] In this embodiment, the fly ash is heated more uniformly by the microwave generators 31.

[0117] Example 11 : differs from example 8 in that the fly ash in the fly ash transport channel 210 is heated to 420°C and the fly ash stays in the fly ash transport channel 210 for 45 min.

[0118] Example 12: differs from example 8 in that the fly ash in the fly ash transport channel 210 is heated to 450°C and the fly ash stays in the fly ash transport channel 210 for 50 min.

Claims

1. A device for removing dioxins from fly ash by low-temperature pyrolysis, characterized in that: It comprises a support structure (10), a fly ash transmission mechanism (20) and a pyrolysis heating mechanism (30) arranged in the support structure (10); The support structure (10) comprises a vertically extending cylindrical main body support shell (11) with a hollow interior; The fly ash transmission mechanism (20) comprises a fly ash transmission pipe shell (21) coaxially arranged in the main body support shell (11) and with an opening facing downwards, a transmission drive pipe shell (22) coaxially arranged and with an opening facing downwards is rotatably connected in the fly ash transmission pipe shell (21), and a fly ash transmission channel (210) is formed between the inner side wall of the fly ash transmission pipe shell (21) and the outer side wall of the transmission drive pipe shell (22); The outer side wall of the transmission drive housing (22) is fixed with a plurality of transmission drive spiral plates (221) spirally extending around its axis; The upper end of the fly ash transmission channel (210) is connected to a plurality of fly ash initial input pipes (201); A smoke collecting chamber (220) is formed inside the transmission drive tube shell (22), and a plurality of smoke through holes (2201) communicating with each other are provided on the side wall of the transmission drive tube shell (22); A plurality of smoke exhaust pipes (202) are fixedly passed through the side wall of the main body support shell (11), and one end of the smoke exhaust pipe (202) located inside the main body support shell (11) is in communication with the smoke collection chamber (220); The pyrolysis heating mechanism (30) comprises a plurality of microwave generators (31) arranged on the inner side wall of the main body support shell (11).

2. The device for removing dioxins by low-temperature pyrolysis of fly ash according to claim 1, characterized in that: A transmission drive accommodating shell (23) is fixed on the top of the fly ash transmission tube shell (21); a transmission drive connecting hole (231) is vertically penetrated through the top of the fly ash transmission tube shell (21) and is connected to the interior of the transmission drive accommodating shell (23); a vertically extending and hollow transmission drive pipe shaft (232) is rotatably connected in the transmission drive connecting hole (231); the lower end of the transmission drive pipe shaft (232) is fixedly connected to the top of the transmission drive tube shell (22); A driven gear (233) is fixed to one end of the transmission drive tube shaft (232) in the transmission drive housing (23), a transmission drive motor (234) is fixed in the transmission drive housing (23), a driving gear (235) is fixed on the output shaft of the transmission drive motor (234), and the driving gear (235) is meshed and connected with the driven gear (233); A smoke exhaust hole (222) is vertically provided on the top of the transmission drive tube shell (22) and is connected to the interior of the transmission drive tube shaft (232); One end of the smoke exhaust pipe (202) located in the main body support shell (11) is connected to the interior of the transmission drive accommodating shell (23).

3. The device for removing dioxins by low-temperature pyrolysis of fly ash according to claim 2, characterized in that: An auxiliary heating mechanism (24) is provided in the transmission drive tube housing (22), and the auxiliary heating mechanism (24) comprises an auxiliary heating support column (241) coaxially provided in the transmission drive tube housing (22), and a plurality of auxiliary heating accommodating grooves (242) are provided on the outer side wall of the auxiliary heating support column (241), and electric heating plates (243) are fixed in the auxiliary heating accommodating grooves (242); The heating surface of the electric heating plate (243) faces the inner wall of the transmission drive tube shell (22); A vertically extending support connecting shaft (244) is fixed to the top of the auxiliary heat support column (241); the upper end of the support connecting shaft (244) extends upward through the transmission drive tube shaft (232) and is fixedly connected to the top of the transmission drive accommodating shell (23).

4. The device for removing dioxins by low-temperature pyrolysis of fly ash according to claim 1, characterized in that: An active flow-guiding mechanism (25) is provided in the transmission drive housing (22), the active flow-guiding mechanism (25) comprising a flow-guiding rotating ring (251) rotatably connected to the top of the transmission drive housing (22) and coaxially arranged therewith, and a flow-guiding driving spiral plate (252) spirally extending downwardly around the axis of the transmission drive housing (22) is fixed to the lower side of the flow-guiding rotating ring (251); The flow-guiding driving spiral plate (252) spirally surrounds the outer periphery of the auxiliary heat supporting column (241).

5. The device for removing dioxins by low-temperature pyrolysis of fly ash according to claim 1, characterized in that: The fly ash initial input pipe (201) is connected to the fly ash transmission channel (210) via a circumferential distribution mechanism (26), wherein the circumferential distribution mechanism (26) comprises a plurality of fly ash dispersion and communication shells (261) fixed on the top of the fly ash transmission pipe shell (21), and the plurality of fly ash dispersion and communication shells (261) are evenly dispersed around the circumference of the fly ash transmission pipe shell (21); The lower end of the fly ash dispersion communication shell (261) is connected to the fly ash transmission channel (210) through a vertically penetrating fly ash input communication groove (262), and the upper end of the fly ash dispersion communication shell (261) is connected to the fly ash initial input pipe (201); The fly ash dispersion communicating shell (261) has a plurality of dispersion guide plates (263) inside.

6. The device for removing dioxins by low-temperature pyrolysis of fly ash according to claim 3, characterized in that: The lower end of the main body support shell (11) is erected on the ground via a support frame (12); An outflow guide cone shell (211) with an upward opening and an inverted cone shape is fixed to the lower end of the fly ash transmission pipe shell (21); a vertically extending fly ash outflow pipe (212) is connected to the lower end of the outflow guide cone shell (211); and the lower end of the fly ash outflow pipe (212) extends to the outside of the main body support shell (11); A closed cone shell (223) with an upward opening is fixed to the lower end of the transmission drive tube shell (22); A fly ash temporary storage pool (13) with an upward opening is provided below the fly ash external discharge pipe (212).

7. The device for removing dioxins by low-temperature pyrolysis of fly ash according to claim 1, characterized in that: The microwave generator (31) is connected to the inner side wall of the main body support shell (11) via a circumferential drive mechanism (32); the circumferential drive mechanism (32) comprises a plurality of circumferential drive support rings (321) fixed on the inner side wall of the main body support shell (11); a circumferential drive rotating ring (322) coaxially arranged therewith is rotatably connected to the inner side of the circumferential drive support ring (321); a plurality of bowl-shaped microwave reflective shells (323) are fixed to the inner side of the circumferential drive rotating ring (322); and the microwave generator (31) is fixed in the microwave reflective shell (323); The circumferential drive support ring (321) is coaxially arranged with the main body support shell (11), and a plurality of circumferential drive support rings (321) are arranged along the axial direction of the main body support shell (11); The opening direction of the microwave reflection shell (323) is toward the central axis side of the main body support shell (11).

8. A process for removing dioxins from fly ash by low-temperature pyrolysis, based on the device for removing dioxins from fly ash by low-temperature pyrolysis according to claim 6, characterized in that: The following steps are involved: S1. Fly ash input: Using an external screw conveying pump, fly ash with a moisture content of 5% is fed into the fly ash transmission channel (210) through the fly ash initial input pipe (201); The transmission drive motor (234) drives the transmission drive housing (22) to rotate, and the transmission drive housing (22) rotates together with the plurality of transmission drive spiral plates (221). Driven by the plurality of transmission drive spiral plates (221), the fly ash moves from top to bottom in the fly ash transmission channel (210); S2. Microwave pyrolysis of fly ash: Turning on a plurality of microwave generators (31), heating the fly ash in the fly ash transmission channel (210) to 400-450° C. by microwave heating, and performing pyrolysis treatment on the fly ash, wherein the fly ash stays in the fly ash transmission channel (210) for 40-50 minutes; S3, fly ash auxiliary heating: During step S2, the plurality of electric heating plates (243) are turned on to heat the fly ash in the fly ash transmission channel (210) by utilizing heat radiation, so that the fly ash in the fly ash transmission channel (210) is heated more evenly; S4. Exhaust of flue gas: The flue gas generated by the pyrolysis of the fly ash in the fly ash transmission channel (210) enters the flue gas collection chamber (220) through the flue gas through-holes (2201) on the side wall of the transmission drive tube shell (22), and the flue gas in the flue gas collection chamber (220) is then discharged through a plurality of flue gas exhaust pipes (202); S5. Output of fly ash after pyrolysis: The fly ash after pyrolysis treatment is discharged from the lower end of the fly ash transmission channel (210) into the external discharge guide cone shell (211), and the fly ash in the external discharge guide cone shell (211) is then discharged through the fly ash external discharge pipe (212) and falls into the fly ash temporary storage pool (13) for storage.

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