Waste incineration fly ash treatment device and method

Abstract

The present invention discloses a device and method for treating fly ash from garbage incineration, which relates to the field of garbage treatment technology. The device and method include a combustion furnace, a TiO2 raw material bin, a waste heat boiler, a first screw extrusion mechanism, a cooling mechanism, a mixing mechanism, a lime and sand raw material bin, a stabilizer raw material bin, a water storage bin, a second screw extrusion mechanism, a concrete block preparation machine, and a support frame structure. A material guide seat is installed at the bottom of the inner wall of the combustion furnace, and an inclined arc groove is opened on the top of the material guide seat. A burner is installed on one side of the combustion furnace, and the fire outlet end of the burner corresponds to the top position of the arc groove. The present invention can burn fly ash under a certain temperature environment, effectively remove chlorine in fly ash, and replace the existing technology of using water washing and acid washing to remove chlorine in fly ash, avoid the phenomenon of heavy metals and other pollutants migrating from the solid phase to the liquid phase, and realize the cement solidification operation of garbage incineration fly ash.

Description

Technical Field

[0001] The present invention relates to the technical field of garbage disposal, and in particular to a device and method for treating fly ash from garbage incineration. Background Art

[0002] Waste-to-energy incineration has become a new solution for municipal solid waste management and one of the most suitable methods for treating it. However, waste incineration produces a large amount of fly ash, which is the residue collected by flue gas purification and heat recovery systems (such as economizers and boilers). This is the material collected by the flue gas dust collector after the incineration of municipal solid waste.

[0003] At present, the main technologies for treating incineration fly ash include stabilization and solidification + landfill, separation of metals before landfill, storage of abandoned rock salt mines, high-temperature melting and co-treatment to produce cement, etc. However, the abandoned rock salt mine storage technology has the problem of harming the ecological environment; the energy consumption cost of the separation of metals before landfill technology and the high-temperature melting and co-treatment to produce cement technology is too high, and requires cumbersome pre-treatment. Its equipment investment and operating costs are significantly higher than the traditional "stabilization and solidification + landfill" technology, making stabilization and solidification + landfill technology the main treatment path for treating incineration fly ash. The commonly used method of stabilization and solidification + landfill technology is cement solidification method. After the fly ash is mixed into the cement matrix, under certain conditions, it undergoes a series of physical and chemical reactions to reduce the mobility of the fly ash in the waste cement matrix system. Sometimes, it is also added. Some auxiliary materials are used to promote the reaction process, and finally the granular materials are turned into bonded concrete blocks, so that a large amount of fly ash is stabilized due to solidification. However, although cement solidification treatment of fly ash has the advantages of mature technology, simple operation and low treatment cost, the fly ash from garbage incineration contains a high content of chlorine. If the chlorine is not pre-treated when the fly ash is treated by cement solidification method, it will affect the mechanical properties of the cement blocks after solidification and will cause heavy metal ion leaching in the later stage. The existing technology usually uses water washing and acid washing to treat the chlorine element in fly ash, but both inevitably cause heavy metals and other pollutants to migrate from the solid phase to the liquid phase. The wastewater contains a large amount of heavy metal ions and chlorine elements, etc., and water purification is still required later. Therefore, it is urgent to design a device and method for treating fly ash from garbage incineration to solve the above problems. Summary of the Invention

[0004] The present invention aims to address the shortcomings of the prior art by proposing a waste incineration fly ash treatment device and method. Its advantages include effectively removing chlorine from fly ash, replacing the existing water and acid washing methods used to remove chlorine from fly ash. This prevents the migration of heavy metals and other pollutants from the solid phase to the liquid phase, prevents the presence of large amounts of residual chlorine in the fly ash, which could affect the mechanical properties of subsequent concrete blocks, and prevents heavy metal ion leaching from the concrete blocks.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A waste incineration fly ash processing device includes a combustion furnace, a TiO2 raw material bin, a waste heat boiler, a first screw extrusion mechanism, a cooling mechanism, a mixing mechanism, a lime and sand raw material bin, a stabilizer raw material bin, a water storage bin, a second screw extrusion mechanism, a concrete block preparation machine, and a support frame structure. A material guide seat is installed at the bottom of the inner wall of the combustion furnace, and an inclined arc-shaped groove is formed on the top of the material guide seat. A burner is installed on one side of the combustion furnace, and the firing end of the burner corresponds to the top position of the arc-shaped groove. Inclined mounting holes are formed on both sides of the combustion furnace and the bottom of the arc-shaped groove, and the inclination of the mounting holes is greater than the inclination of the arc-shaped groove.

[0007] The first screw extrusion mechanism includes a first material guide barrel mounted on the mounting hole and passing through the combustion furnace, and the inner wall of the first material guide barrel is rotatably connected to the first main shaft, one end of the first material guide barrel is mounted with a forward and reverse motor for driving the first main shaft to rotate, and the first auger blade is mounted on the first main shaft;

[0008] The mixing mechanism includes a mixing furnace, and a mixing assembly is provided inside the mixing furnace. A connecting pipe is fixed to the top of the mixing furnace, and a premixing cylinder is installed at one end of the connecting pipe and one end of the first material guide cylinder.

[0009] The cooling mechanism comprises a water tank, and a refrigerator is installed on one side of the water tank. A first sealing sleeve is installed on the outer wall of the first material guiding cylinder, and a second sealing sleeve is installed on the outer wall of the second material guiding cylinder.

[0010] The present invention is further configured such that the outer wall of the first auger blade is adapted to the inner wall of the first material guide cylinder, a first feed hopper is fixed to one end of the top of the first material guide cylinder, and a first sealing cover is provided on the top of the first feed hopper, a drop opening and a receiving opening are respectively provided at the bottom of the first material guide cylinder, and the position of the drop opening is close to the burner, and the position of the receiving opening is close to the bottom of the arc groove, the front end of the first auger blade is close to the drop opening, and the length of the first auger blade is greater than the distance between the drop opening and the receiving opening.

[0011] The present invention is further configured such that a second feed hopper is fixed on the top of the premixing cylinder, and a second sealing cover is provided on the second feed hopper, the first main shaft extends through the premixing cylinder and the connecting pipe to the interior of the mixing furnace, and the outer wall of the first main shaft is equipped with stirring plates distributed in an annular shape at equal distances, and the stirring plates are located inside the premixing cylinder.

[0012] The present invention is further configured as follows: the mixing assembly includes a support cylinder installed in the middle position of the inner wall at the top of the kneading furnace, and the bottom end of the first main shaft extends to the interior of the support cylinder, a first through hole is opened on one side of the support cylinder, the inner wall of the first through hole is rotatably connected to the outer wall of the first main shaft by a bearing, a second through hole is opened in the middle position of the bottom of the support cylinder, and the inner wall of the second through hole is rotatably connected to a driven shaft by a bearing, a stirring frame and a spiral blade are respectively installed on the driven shaft, a second bevel gear is installed on the top of the driven shaft, and a first bevel gear is installed at the bottom end of the first main shaft, the first bevel gear is meshed with the second bevel gear, the stirring frame is located above the spiral blade, and the stirring frame includes stirring blades fixed on the driven shaft at equal distances, and reinforcement rings are fixed between the stirring blades, and the diameter of the spiral blade gradually increases from bottom to top.

[0013] The present invention is further configured such that the second screw extrusion mechanism includes a second material guide barrel installed at the bottom end of the mixing furnace, and a first valve is installed at the bottom of the mixing furnace, the inner wall of the second material guide barrel is rotatably connected to the second main shaft, and a rotating motor for driving the second main shaft to rotate is installed at one end of the second material guide barrel, a second auger blade is installed on the second main shaft, the outer wall of the second auger blade is adapted to the inner wall of the second material guide barrel, and an extrusion tube is installed at one end of the bottom of the second material guide barrel.

[0014] The present invention is further configured such that a water inlet pipe is fixed to one end of the top of the first sealing sleeve and one end of the top of the second sealing sleeve, a return pipe is fixed to the other end of the bottom of the first sealing sleeve and the other end of the bottom of the second sealing sleeve, a circulating pump is installed on the top of the water tank, and a suction pipe plugged into the water tank is installed at the water inlet end of the circulating pump, a first three-way joint is installed at the water outlet pipe of the circulating pump and one end of the two water inlet pipes, a collecting pipe is fixed to the top of one side of the water tank, and a second three-way joint is installed at the top of the collecting pipe and one end of the two return pipes.

[0015] The present invention is further configured such that a first metering device is used to proportion the TiO2 raw material between the combustion furnace and the TiO2 raw material bin, a second metering device is used to proportion the lime, sand and gravel raw materials between the mixing mechanism and the lime, sand and gravel raw material bin, a third metering device is used to proportion the stabilizer raw material between the mixing mechanism and the stabilizer raw material bin, and a fourth metering device is used to proportion the water between the mixing mechanism and the water storage bin.

[0016] The present invention is further configured such that the support frame structure is fixedly composed of a first support frame, a second support frame, a ladder and a discharge platform, and the combustion furnace is installed on the top of the first support frame, the mixing mechanism is installed on the top of the second support frame, the ladder is installed on one side of the first support frame, the discharge platform is installed on the top of one side of the ladder, the second material guide barrel is installed inside the second support frame, and the water tank is installed inside the first support frame.

[0017] The present invention is further configured such that a flue gas exhaust pipe is installed on the top of the combustion furnace, and a smoke return pipe is installed on the top of the flue gas exhaust pipe, the discharge end of the smoke return pipe is connected to the waste heat boiler, and a second valve is installed on the smoke return pipe.

[0018] A method for treating fly ash from waste incineration, applied to a waste incineration fly ash treatment device, comprises the following steps:

[0019] Step 1: in the flue gas dust collector, TiO2 raw material warehouse, lime sand and gravel raw material warehouse, stabilizer raw material warehouse and water storage warehouse, respectively, using a weighing device, a first metering device, a second metering device, a third metering device and a fourth metering device to weigh fly ash, TiO2 raw material, lime sand and gravel raw material, stabilizer raw material and water according to a certain mass ratio to obtain raw materials;

[0020] Step 2: Fly ash and TiO2 raw materials are transported to the combustion furnace through the first feed hopper, the burner is started, the combustion temperature is controlled at 400-500°C, and the forward rotation of the forward and reverse motor in the first screw extrusion mechanism is used to circulate the fly ash and TiO2 in the combustion furnace, and the fly ash and TiO2 are burned at high temperature to remove chlorine. The combustion is continued for 2-3 hours, and the second valve is opened to recover the combustion flue gas into the waste heat boiler through the flue gas exhaust pipe and the return flue gas pipe to perform waste heat recovery operation;

[0021] Step 3: The combusted fly ash is transported to the premixing drum by the reverse action of the forward and reverse motor in the first screw extruder mechanism. At this time, the falling fly ash is initially cooled by the cooling mechanism, and at the same time, the well-proportioned lime, sand and gravel raw materials, stabilizer raw materials and water are transported to the premixing drum through the second feed hopper for premixing with the fly ash;

[0022] Step 4: The pre-mixed raw materials are transported to the mixing furnace through the continuous pushing of the first screw extruder mechanism, and the raw materials are mixed by the mixing component for 1-1.5 hours to obtain a mixed product of fly ash and lime sand and gravel raw materials;

[0023] Step 5: Open the first valve and use the second screw extrusion mechanism to extrude the mixed product. At the same time, the mixed product is cooled by the cooling mechanism, and then the mixed product is transported to the concrete block preparation machine to prepare fly ash and lime sand and stone raw material blocks.

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention can burn fly ash under a certain temperature environment to effectively remove chlorine in the fly ash, and add a certain proportion of TiO2 raw materials into the combustion process to promote the volatilization of chlorine in the fly ash, replacing the existing technology of using water washing and acid washing to remove chlorine in the fly ash, thereby avoiding the phenomenon of heavy metals and other pollutants migrating from the solid phase to the liquid phase, thereby preventing the residual large amount of chlorine in the fly ash from affecting the mechanical properties of the subsequent concrete blocks and avoiding the problems of heavy metal ion leaching in the concrete blocks;

[0026] 2. The present invention can drive the first main shaft and the first auger blade to rotate forward under the forward rotation of the forward and reverse motors, driving the fly ash and TiO2 raw materials to perform reciprocating cyclic motion in the receiving port and the discharge port. On the one hand, the fly ash and the TiO2 raw materials can be mixed to a certain extent so that the fly ash and the TiO2 raw materials are in uniform contact. On the other hand, the fly ash and the TiO2 raw materials can be fully circulated on one side of the burner so that the combustion is uniform, thereby ensuring the sufficient combustion performance of the fly ash.

[0027] 3. The present invention can return the high-temperature flue gas generated when burning fly ash to the waste heat boiler during waste incineration through the flue gas exhaust pipe and the return flue pipe, and can further heat the waste heat boiler to achieve waste heat recovery performance during fly ash incineration;

[0028] 4. The present invention can transport the fly ash after combustion to the premixing drum and the mixing furnace under the reverse action of the forward and reverse motors for premixing and mixing operations respectively, and then add a certain proportion of lime sand and gravel raw materials, stabilizer raw materials and water into the premixing and mixing process to ensure that the various raw materials are mixed evenly, thereby achieving the cement solidification operation of the waste incineration fly ash, and the mixed product can be transported to the concrete block making machine to be prepared into blocks;

[0029] 5. The present invention can cool the fly ash and the mixed product in the first material guide barrel and the second material guide barrel respectively under the action of the cooling mechanism, so as to avoid the influence of excessive temperature on subsequent operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a flow chart of a waste incineration fly ash treatment device proposed by the present invention;

[0031] Figure 2 This is a three-dimensional diagram of a waste incineration fly ash treatment device proposed by the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the combustion furnace and mixing mechanism of a waste incineration fly ash treatment device proposed by the present invention;

[0033] Figure 4 This is a cross-sectional view of a first screw extrusion mechanism and a mixing mechanism of a waste incineration fly ash treatment device proposed by the present invention;

[0034] Figure 5 This is a cross-sectional view of the second screw extrusion mechanism of a waste incineration fly ash treatment device proposed by the present invention;

[0035] Figure 6 This is a schematic structural diagram of a cooling mechanism of a waste incineration fly ash treatment device proposed by the present invention;

[0036] Figure 7 A cross-sectional view of a combustion furnace of a waste incineration fly ash treatment device proposed by the present invention;

[0037] Figure 8 This is a schematic diagram of the structure of the discharge port and receiving port of a waste incineration fly ash treatment device proposed by the present invention;

[0038] Figure 9 This is a cross-sectional view of a mixing mechanism of a waste incineration fly ash treatment device proposed by the present invention;

[0039] Figure 10 This is a schematic diagram of the support frame structure of a waste incineration fly ash treatment device proposed in the present invention.

[0040] Figure: 1. Combustion furnace; 101. Burner; 102. Flue gas exhaust pipe; 103. Material guide base; 104. Mounting hole; 105. Arc groove; 2. TiO2 raw material bin; 3. First metering device; 4. Return flue gas pipe; 5. Waste heat boiler; 6. First screw extruder; 601. First material guide barrel; 602. Forward and reverse motor; 603. First feed hopper; 604. First spindle; 605. First auger blade 606, feeding port; 607, receiving port; 7, cooling mechanism; 701, water tank; 702, circulation pump; 703, first three-way joint; 704, water inlet pipe; 705, first sealing sleeve; 706, second three-way joint; 707, second sealing sleeve; 708, refrigerator; 709, return pipe; 710, collecting pipe; 8, mixing mechanism; 801, mixing furnace; 802, connecting pipe; 80 3. Premixing barrel; 804. Second feed hopper; 805. Stirring plate; 806. Support barrel; 807. Driven shaft; 808. Stirring frame; 8081. Stirring blade; 8082. Reinforcement ring; 809. First bevel gear; 810. Spiral blade; 811. First valve; 812. Second bevel gear; 9. Lime and sand raw material warehouse; 10. Second metering device; 11. Stabilizer raw material warehouse; 12. Third metering device; 13. Water storage tank; 14. Fourth metering device; 15. Second screw extrusion mechanism; 1501. Second material guide barrel; 1502. Rotating motor; 1503. Extrusion tube; 1504. Second main shaft; 1505. Second auger blade; 16. Concrete block preparation machine; 17. Support frame structure; 1701. First support frame; 1702. Second support frame; 1703. Ladder platform; 1704. Discharge platform. DETAILED DESCRIPTION

[0041] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0042] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0043] Reference Figures 1-10A waste incineration fly ash treatment device includes a combustion furnace 1, a TiO2 raw material warehouse 2, a waste heat boiler 5, a first screw extrusion mechanism 6, a cooling mechanism 7, a mixing mechanism 8, a lime sand and gravel raw material warehouse 9, a stabilizer raw material warehouse 11, a water storage warehouse 13, a second screw extrusion mechanism 15, a concrete block preparation machine 16 and a support frame structure 17. The TiO2 raw material is mixed between the combustion furnace 1 and the TiO2 raw material warehouse 2 through a first metering device 3, the lime sand and gravel raw material is mixed between the mixing mechanism 8 and the lime sand and gravel raw material warehouse 9 through a second metering device 10, the stabilizer raw material is mixed between the mixing mechanism 8 and the stabilizer raw material warehouse 11 through a third metering device 12, and the stabilizer raw material is mixed between the mixing mechanism 8 and the water storage warehouse 13 through a fourth metering device. The device 14 is used to mix moisture. A material guide seat 103 is installed at the bottom of the inner wall of the combustion furnace 1, and an inclined arc groove 105 is provided on the top of the material guide seat 103. A burner 101 is installed on one side of the combustion furnace 1. The ignition end of the burner 101 corresponds to the top position of the arc groove 105. Both sides of the combustion furnace 1 and the bottom of the arc groove 105 are provided with inclined mounting holes 104, and the inclination of the mounting holes 104 is greater than the inclination of the arc groove 105. The first screw extrusion mechanism 6 includes a first material guide barrel 601 installed on the mounting hole 104 and passing through the combustion furnace 1, and the inner wall of the first material guide barrel 601 is rotatably connected to the first main shaft 604. One end of the first material guide barrel 601 is provided with a screw for driving the first material guide barrel 601. The first main shaft 604 rotates the forward and reverse motor 602, and the first main shaft 604 is equipped with a first auger blade 605. The outer wall of the first auger blade 605 is adapted to the inner wall of the first material guide cylinder 601. A first feed hopper 603 is fixed to one end of the top of the first material guide cylinder 601, and a first sealing cover is provided on the top of the first feed hopper 603. A drop opening 606 and a receiving opening 607 are respectively provided at the bottom of the first material guide cylinder 601, and the drop opening 606 is located close to the burner 101, and the receiving opening 607 is located close to the bottom of the arc groove 105. The front end of the first auger blade 605 is close to the drop opening 606, and the length of the first auger blade 605 is greater than the drop opening 606 and the receiving opening 607. The distance between them is controlled by the forward rotation of the above-mentioned forward and reverse motor 602, which drives the first main shaft 604 and the first auger blade 605 to rotate forward, and drives the fly ash and TiO2 raw materials to move back and forth in the receiving port 607 and the discharge port 606. On the one hand, the fly ash and TiO2 raw materials can be mixed to a certain extent, so that the fly ash and TiO2 raw materials are in uniform contact. On the other hand, the fly ash and TiO2 raw materials can be fully circulated on one side of the burner 101, so that the combustion is uniform, the full combustion performance of the fly ash is guaranteed, the chlorine element in the fly ash is effectively removed, and a large amount of residual chlorine element in the fly ash is avoided to affect the mechanical properties of the subsequent concrete blocks and to avoid the problems of heavy metal ion leaching in the concrete blocks.

[0044] In order to mix the various raw materials during curing, refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 8 and Figure 9 The mixing mechanism 8 includes a mixing furnace 801, and a mixing assembly is provided inside the mixing furnace 801. A connecting pipe 802 is fixed to the top of the mixing furnace 801, and a premixing cylinder 803 is installed at one end of the connecting pipe 802 and one end of the first material guide cylinder 601. A second feed hopper 804 is fixed to the top of the premixing cylinder 803, and a second sealing cover is provided on the second feed hopper 804. The first main shaft 604 extends through the premixing cylinder 803 and the connecting pipe 802 to the interior of the mixing furnace 801, and the outer wall of the first main shaft 604 is provided with stirring plates 805 distributed in an annular manner at equal distances. , the stirring plate 805 is located inside the premixing cylinder 803, the mixing assembly includes a support cylinder 806 installed in the middle of the inner wall of the top of the kneading furnace 801, and the bottom end of the first main shaft 604 extends to the inside of the support cylinder 806, a first through hole is opened on one side of the support cylinder 806, the inner wall of the first through hole and the outer wall of the first main shaft 604 are rotatably connected by a bearing, a second through hole is opened in the middle of the bottom of the support cylinder 806, and the inner wall of the second through hole is rotatably connected to the driven shaft 807 by a bearing, and the driven shaft 807 is respectively installed with a stirring frame 808 and a spiral blade 81 0, a second bevel gear 812 is installed on the top of the driven shaft 807, and a first bevel gear 809 is installed on the bottom end of the first main shaft 604, the first bevel gear 809 is meshed with the second bevel gear 812, the stirring frame 808 is located above the spiral blade 810, and the stirring frame 808 includes stirring pieces 8081 fixed on the driven shaft 807 at equal distances, and reinforcement rings 8082 are fixed between the stirring pieces 8081, the diameter of the spiral blade 810 gradually increases from bottom to top, and the reverse action of the above-mentioned forward and reverse motor 602 is used to drive the first auger blade 605 to reverse. The fly ash after combustion is transported to the premixing drum 803, and at the same time, the lime sand and gravel raw materials, stabilizer raw materials and water with a good proportion are transported to the premixing drum 803 through the second feed hopper 804 to be premixed with the fly ash, so that the various raw materials after premixing enter the mixing furnace 801 through the connecting pipe 802. Under the rotation action of the first main shaft 604, the first bevel gear 809, the second bevel gear 812, the driven shaft 807, the stirring frame 808 and the spiral blade 810 in the mixing assembly can be driven to rotate, thereby realizing the mixing operation of various raw materials and facilitating the obtaining of mixed products.

[0045] In order to export the solidified mixed product, refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 5The second screw extrusion mechanism 15 includes a second material guide barrel 1501 installed at the bottom end of the mixing furnace 801, and a first valve 811 is installed at the bottom of the mixing furnace 801. The inner wall of the second material guide barrel 1501 is rotatably connected to the second main shaft 1504, and one end of the second material guide barrel 1501 is installed with a rotating motor 1502 for driving the second main shaft 1504 to rotate. A second auger blade 1505 is installed on the second main shaft 1504, and the outer wall of the second auger blade 1505 is adapted to the inner wall of the second material guide barrel 1501. An extrusion tube 1503 is installed at one end of the bottom of the second material guide barrel 1501. The above-mentioned rotating motor 1502 is used to drive the second main shaft 1504 and the second auger blade 1505 to rotate. The mixed product can be extruded under the push of the spiral blade 810 and the second auger blade 1505, and then transported to the concrete block preparation machine 16 to be prepared into blocks.

[0046] In order to avoid the influence of high temperature on subsequent operations, refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 6 The cooling mechanism 7 includes a water tank 701, and a refrigerator 708 is installed on one side of the water tank 701. A first sealing sleeve 705 is installed on the outer wall of the first material guide cylinder 601, and a second sealing sleeve 707 is installed on the outer wall of the second material guide cylinder 1501. The top end of the first sealing sleeve 705 and the top end of the second sealing sleeve 707 are both fixed with a water inlet pipe 704, and the other end of the bottom of the first sealing sleeve 705 and the other end of the bottom of the second sealing sleeve 707 are both fixed with a return pipe 709. A circulating pump 702 is installed on the top of the water tank 701, and the water inlet end of the circulating pump 702 is installed with a water pumping pipe plugged into the water tank 701. The water outlet pipe of the circulating pump 702 is connected to the two water inlet pipes. A first three-way joint 703 is installed at one end of 704, a collecting pipe 710 is fixed on the top of one side of the water tank 701, and a second three-way joint 706 is installed at the top of the collecting pipe 710 and one end of the two return pipes 709. The above-mentioned refrigerator 708 is used to cool the water in the water tank 701, and the cold water is circulated in the first sealing sleeve 705 and the second sealing sleeve 707 in conjunction with the circulating pump 702, the water suction pipe, the first three-way joint 703, the water inlet pipe 704, the return pipe 709, the second three-way joint 706 and the collecting pipe 710, which can cool the fly ash in the first material guide barrel 601 and the mixed product in the second material guide barrel 1501 to avoid excessive temperature affecting the operation.

[0047] In order to ensure the stable performance of the entire device, refer to Figure 2 and Figure 10The support frame structure 17 is fixedly composed of a first support frame 1701, a second support frame 1702, a ladder 1703 and a discharge platform 1704, and the combustion furnace 1 is installed on the top of the first support frame 1701, the mixing mechanism 8 is installed on the top of the second support frame 1702, the ladder 1703 is installed on one side of the first support frame 1701, the discharge platform 1704 is installed on the top of one side of the ladder 1703, the second material guide barrel 1501 is installed inside the second support frame 1702, and the water tank 701 is installed inside the first support frame 1701. The above-mentioned support frame structure 17 is used to support the entire device to ensure stability, and the ladder 1703 is used to facilitate the placement of various raw materials, and various raw materials can also be placed through the discharge platform 1704 to avoid climbing the ladder 1703 multiple times.

[0048] In order to facilitate the recovery and utilization of waste heat, refer to Figure 1 、 Figure 2 and Figure 7 A flue gas exhaust pipe 102 is installed on the top of the combustion furnace 1, and a return smoke pipe 4 is installed on the top of the flue gas exhaust pipe 102. The discharge end of the return smoke pipe 4 is connected to the waste heat boiler 5. A second valve is installed on the return smoke pipe 4. The above-mentioned flue gas exhaust pipe 102 and return smoke pipe 4 are used to recover the combustion flue gas into the waste heat boiler 5 to achieve waste heat recovery performance.

[0049] A method for treating fly ash from waste incineration, applied to a waste incineration fly ash treatment device, comprises the following steps:

[0050] Step 1: In the flue gas dust collector, TiO2 raw material warehouse 2, lime sand and gravel raw material warehouse 9, stabilizer raw material warehouse 11 and water storage warehouse 13, fly ash, TiO2 raw material, lime sand and gravel raw material, stabilizer raw material and water are weighed according to a certain mass ratio by a weighing device, a first metering device 3, a second metering device 10, a third metering device 12 and a fourth metering device 14 respectively to obtain raw materials;

[0051] Step 2: Fly ash and TiO2 raw materials are transported to the combustion furnace 1 through the first feed hopper 603, the burner 101 is started, the combustion temperature is controlled at 400-500°C, and the forward rotation of the forward and reverse motor 602 in the first screw extruder mechanism 6 is used to circulate the fly ash and TiO2 in the combustion furnace 1, and the fly ash and TiO2 raw materials are burned at high temperature to remove chlorine. The combustion is continued for 2-3 hours, and the second valve is opened to recover the combustion flue gas into the waste heat boiler 5 through the flue gas exhaust pipe 102 and the return flue gas pipe 4 to perform waste heat recovery operation;

[0052] Step 3: The combusted fly ash is conveyed into the premixing drum 803 by the reverse action of the forward and reverse motor 602 in the first screw extruder mechanism 6. At this time, the falling fly ash is preliminarily cooled by the cooling mechanism 7. At the same time, the well-proportioned lime, sand and gravel raw materials, stabilizer raw materials and water are conveyed into the premixing drum 803 through the second feed hopper 804 for premixing with the fly ash.

[0053] Step 4: The pre-mixed raw materials are conveyed into the mixing furnace 801 by continuous pushing of the first screw extruder 6, and the raw materials are mixed by a mixing assembly for 1-1.5 hours to obtain a mixed product of fly ash and lime sand and gravel raw materials;

[0054] Step 5: Open the first valve 811, use the second screw extrusion mechanism 15 to extrude the mixed product, and at the same time cool the mixed product under the action of the cooling mechanism 7, and then transport the mixed product to the concrete block preparation machine 16 to prepare fly ash and lime sand and stone raw material blocks.

[0055] Working principle: When in use, the user weighs the fly ash, TiO2 raw material, lime sand and gravel raw material, stabilizer raw material and water according to a certain mass ratio through the weighing device, the first metering device 3, the second metering device 10, the third metering device 12 and the fourth metering device 14, and then transports the fly ash and TiO2 raw material into the combustion furnace 1 through the first feed hopper 603, starts the burner 101, controls the combustion temperature at 400-500℃, and drives the first main shaft 604 and the first auger blade 605 to rotate forward under the forward rotation of the forward and reverse motor 602, driving the fly ash and TiO2 raw material to act reciprocatingly in the receiving port 607 and the discharge port 606 The fly ash and TiO2 raw materials are mixed and circulated on one side of the burner 101, thereby burning the fly ash and TiO2 raw materials at high temperature to remove chlorine elements. The combustion is continued for 2-3 hours, and the second valve is opened. The combustion flue gas is recovered to the waste heat boiler 5 under the action of the flue gas exhaust pipe 102 and the return flue pipe 4 to perform waste heat recovery operation; after the combustion is completed, the user turns off the burner 101, controls the forward and reverse motor 602 to reverse, and also starts the refrigerator 708 and the circulating pump 702, at this time driving the first auger blade 605 to reverse, and transporting the burned fly ash to the premixing cylinder 803, and also through the refrigerator 708 to the water tank 70 1, and the cold water is circulated in the first sealing sleeve 705 and the second sealing sleeve 707 in conjunction with the circulation pump 702, the water pumping pipe, the first three-way joint 703, the water inlet pipe 704, the return pipe 709, the second three-way joint 706 and the collecting pipe 710, so as to preliminarily cool the fly ash in the first material guide barrel 601, and at the same time, the lime sand and stone raw materials, the stabilizer raw materials and the water with a good ratio are transported to the premixing barrel 803 through the second feeding hopper 804 for premixing with the fly ash, so that the various raw materials after premixing enter the mixing furnace 801 through the connecting pipe 802, and can drive the first bevel gear in the mixing assembly under the rotation of the first main shaft 604. The wheel 809, the second bevel gear 812, the driven shaft 807, the stirring frame 808 and the spiral blade 810 rotate to obtain the mixed product. Finally, the user opens the first valve 811 and starts the rotating motor 1502. The rotating motor 1502 drives the second main shaft 1504 and the second auger blade 1505 to rotate. The mixed product can be squeezed out under the push of the spiral blade 810 and the second auger blade 1505, and then transported to the concrete block preparation machine 16 to be prepared into blocks. In addition, the mixed product in the second material guide barrel 1501 can be cooled by circulating cold water in the second sealing sleeve 707 to avoid excessive temperature affecting subsequent operations.

[0056] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A waste incineration fly ash treatment device, comprising a combustion furnace (1), a TiO2 raw material bin (2), a waste heat boiler (5), a first screw extrusion mechanism (6), a cooling mechanism (7), a mixing mechanism (8), a lime sand and gravel raw material bin (9), a stabilizer raw material bin (11), a water storage bin (13), a second screw extrusion mechanism (15), a concrete block making machine (16) and a support frame structure (17), characterized in that: A material guide seat (103) is installed at the bottom of the inner wall of the combustion furnace (1), and an inclined arc-shaped groove (105) is provided at the top of the material guide seat (103). A burner (101) is installed on one side of the combustion furnace (1), and the firing end of the burner (101) corresponds to the top position of the arc-shaped groove (105). Both sides of the combustion furnace (1) and the bottom of the arc-shaped groove (105) are provided with inclined mounting holes (104), and the inclination of the mounting holes (104) is greater than the inclination of the arc-shaped groove (105). The first screw extrusion mechanism (6) comprises a first material guide barrel (601) mounted on the mounting hole (104) and passing through the combustion furnace (1), wherein the inner wall of the first material guide barrel (601) is rotatably connected to a first main shaft (604), one end of the first material guide barrel (601) is mounted with a forward and reverse motor (602) for driving the first main shaft (604) to rotate, and a first auger blade (605) is mounted on the first main shaft (604); The mixing mechanism (8) includes a mixing furnace (801), and a mixing assembly is provided inside the mixing furnace (801). A connecting pipe (802) is fixed to the top of the mixing furnace (801), and a premixing cylinder (803) is installed between one end of the connecting pipe (802) and one end of the first material guide cylinder (601); The cooling mechanism (7) includes a water tank (701), and a refrigerator (708) is installed on one side of the water tank (701); a first sealing sleeve (705) is installed on the outer wall of the first material guiding cylinder (601), and a second sealing sleeve (707) is installed on the outer wall of the second material guiding cylinder (1501); The outer wall of the first auger blade (605) is adapted to the inner wall of the first material guide cylinder (601); a first feed hopper (603) is fixed to one end of the top of the first material guide cylinder (601), and a first sealing cover is provided on the top of the first feed hopper (603); a drop opening (606) and a receiving opening (607) are respectively provided at the bottom of the first material guide cylinder (601); the drop opening (606) is located close to the burner (101), and the receiving opening (607) is located close to the bottom of the arc groove (105); the front end of the first auger blade (605) is close to the drop opening (606), and the length of the first auger blade (605) is greater than the distance between the drop opening (606) and the receiving opening (607); A second feed hopper (804) is fixed on the top of the premixing cylinder (803), and a second sealing cover is provided on the second feed hopper (804); the first main shaft (604) passes through the premixing cylinder (803) and the connecting pipe (802) and extends to the interior of the mixing furnace (801); and stirring plates (805) are installed on the outer wall of the first main shaft (604) at equal distances and in an annular distribution, and the stirring plates (805) are located inside the premixing cylinder (803); The mixing assembly includes a support cylinder (806) installed in the middle position of the inner wall of the top of the mixing furnace (801), and the bottom end of the first main shaft (604) extends to the inside of the support cylinder (806), a first through hole is opened on one side of the support cylinder (806), the inner wall of the first through hole and the outer wall of the first main shaft (604) are connected to each other by a bearing, a second through hole is opened in the middle position of the bottom of the support cylinder (806), and the inner wall of the second through hole is connected to the driven shaft (807) by a bearing, and the driven shaft (807) is respectively installed with a stirring frame (808) and a spiral blade ( 810), a second bevel gear (812) is installed on the top of the driven shaft (807), and a first bevel gear (809) is installed on the bottom end of the first main shaft (604), the first bevel gear (809) is meshed with the second bevel gear (812), the stirring frame (808) is located above the spiral blade (810), and the stirring frame (808) includes stirring pieces (8081) fixed on the driven shaft (807) at equal distances, and reinforcement rings (8082) are fixed between the stirring pieces (8081), and the diameter of the spiral blade (810) gradually increases from bottom to top.

2. The waste incineration fly ash treatment device according to claim 1, characterized in that: The second screw extrusion mechanism (15) includes a second material guide barrel (1501) installed at the bottom end of the mixing furnace (801), and a first valve (811) is installed at the bottom of the mixing furnace (801), the inner wall of the second material guide barrel (1501) is rotatably connected to the second main shaft (1504), and a rotating motor (1502) for driving the second main shaft (1504) to rotate is installed at one end of the second material guide barrel (1501), a second auger blade (1505) is installed on the second main shaft (1504), the outer wall of the second auger blade (1505) is adapted to the inner wall of the second material guide barrel (1501), and an extrusion tube (1503) is installed at one end of the bottom of the second material guide barrel (1501).

3. The waste incineration fly ash treatment device according to claim 2, characterized in that: A water inlet pipe (704) is fixed to one end of the top of the first sealing sleeve (705) and one end of the top of the second sealing sleeve (707); a return pipe (709) is fixed to the other end of the bottom of the first sealing sleeve (705) and the other end of the bottom of the second sealing sleeve (707); a circulating pump (702) is installed on the top of the water tank (701); a water inlet end of the circulating pump (702) is installed with a water pumping pipe plugged into the water tank (701); a first three-way joint (703) is installed between the water outlet pipe of the circulating pump (702) and one end of the two water inlet pipes (704); a collecting pipe (710) is fixed to the top of one side of the water tank (701); a second three-way joint (706) is installed between the top of the collecting pipe (710) and one end of the two return pipes (709).

4. The waste incineration fly ash treatment device according to claim 3, characterized in that: The TiO2 raw material is proportioned between the combustion furnace (1) and the TiO2 raw material bin (2) via a first metering device (3), the lime sand and gravel raw material is proportioned between the mixing mechanism (8) and the lime sand and gravel raw material bin (9) via a second metering device (10), the stabilizer raw material is proportioned between the mixing mechanism (8) and the stabilizer raw material bin (11) via a third metering device (12), and the water is proportioned between the mixing mechanism (8) and the water storage bin (13) via a fourth metering device (14).

5. The waste incineration fly ash treatment device according to claim 4, characterized in that: The support frame structure (17) is fixedly composed of a first support frame (1701), a second support frame (1702), a ladder platform (1703) and a discharge platform (1704), wherein the combustion furnace (1) is mounted on the top of the first support frame (1701), the mixing mechanism (8) is mounted on the top of the second support frame (1702), the ladder platform (1703) is mounted on one side of the first support frame (1701), the discharge platform (1704) is mounted on the top of one side of the ladder platform (1703), the second material guide cylinder (1501) is mounted inside the second support frame (1702), and the water tank (701) is mounted inside the first support frame (1701).

6. The waste incineration fly ash treatment device according to claim 5, characterized in that: A flue gas exhaust pipe (102) is installed on the top of the combustion furnace (1), and a smoke return pipe (4) is installed on the top of the flue gas exhaust pipe (102). The exhaust end of the smoke return pipe (4) is connected to the waste heat boiler (5), and a second valve is installed on the smoke return pipe (4).

7. A method for treating fly ash from waste incineration, applied to a waste incineration fly ash treatment device according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: in a flue gas dust collector, a TiO2 raw material bin (2), a lime sand and gravel raw material bin (9), a stabilizer raw material bin (11) and a water storage bin (13), fly ash, TiO2 raw material, lime sand and gravel raw material, stabilizer raw material and water are weighed according to a certain mass ratio by a weighing device, a first metering device (3), a second metering device (10), a third metering device (12) and a fourth metering device (14) respectively to obtain raw materials; Step 2: transporting fly ash and TiO2 raw materials into the combustion furnace (1) through the first feed hopper (603), starting the burner (101), controlling the combustion temperature at 400-500°C, and using the forward rotation of the forward and reverse motor (602) in the first screw extrusion mechanism (6) to circulate the fly ash and TiO2 in the combustion furnace (1), burning the fly ash and TiO2 raw materials at high temperature to remove chlorine elements, and continuing the combustion for 2-3 hours, and opening the second valve to recover the combustion flue gas into the waste heat boiler (5) under the action of the flue gas exhaust pipe (102) and the return flue gas pipe (4) to perform waste heat recovery operation; Step 3: The fly ash after combustion is transported to the premixing drum (803) by the reverse action of the forward and reverse motor (602) in the first screw extrusion mechanism (6). At this time, the falling fly ash is preliminarily cooled by the cooling mechanism (7), and at the same time, the lime sand and gravel raw materials, stabilizer raw materials and water with a good proportion are transported to the premixing drum (803) through the second feed hopper (804) for premixing with the fly ash; Step 4: The pre-mixed raw materials are transported to the mixing furnace (801) by continuous pushing of the first screw extruder (6), and the raw materials are mixed by a mixing assembly for 1-1.5 hours to obtain a mixed product of fly ash and lime sand and gravel raw materials; Step 5: Open the first valve (811), use the second screw extrusion mechanism (15) to extrude the mixed product, and at the same time cool the mixed product under the action of the cooling mechanism (7), and then transport the mixed product to the concrete block preparation machine (16) to prepare fly ash and lime sand and stone raw material blocks.

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