CN112555850B - System for melting and treating waste incineration fly ash by utilizing waste heat of liquid blast furnace slag - Google Patents
System for melting and treating waste incineration fly ash by utilizing waste heat of liquid blast furnace slag Download PDFInfo
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- CN112555850B CN112555850B CN202011420241.3A CN202011420241A CN112555850B CN 112555850 B CN112555850 B CN 112555850B CN 202011420241 A CN202011420241 A CN 202011420241A CN 112555850 B CN112555850 B CN 112555850B
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- 239000002893 slag Substances 0.000 title claims abstract description 98
- 238000002844 melting Methods 0.000 title claims abstract description 77
- 230000008018 melting Effects 0.000 title claims abstract description 77
- 239000007788 liquid Substances 0.000 title claims abstract description 69
- 239000002918 waste heat Substances 0.000 title claims abstract description 47
- 238000004056 waste incineration Methods 0.000 title claims abstract description 39
- 238000002156 mixing Methods 0.000 claims abstract description 51
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/442—Waste feed arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
- F23J15/027—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using cyclone separators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2202/00—Combustion
- F23G2202/20—Combustion to temperatures melting waste
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a system for melting and treating waste incineration fly ash by utilizing waste heat of liquid blast furnace slag, which comprises a fly ash feeder, a blast furnace, a melting and mixing device, a fly ash mixer, a high-temperature gas mixer, a slag granulating device, a moving bed waste heat recovery device and a cyclone separator, wherein the fly ash feeder is connected with the blast furnace; the method is characterized in that: the blast furnace discharges high-temperature liquid blast furnace slag, and the high-temperature liquid blast furnace slag and fly ash discharged by a fly ash feeder are mixed and melted in a melting and mixing device; the melting mixing device is provided with additional heat by a heater, so that the melting mixture of the fly ash and the blast furnace slag is in a high-temperature state, and the fluidity of the melting mixture is ensured; then, the molten mixture of the fly ash and the blast furnace slag discharged by the molten mixing device enters a slag granulation device for granulation; meanwhile, heat exchange is carried out between the high-temperature liquid drops and low-temperature air in the granulating device, the high-temperature liquid drops are rapidly solidified into fine solid particles, and hot air is obtained; solid particles are discharged from an outlet of the slag granulating device; the invention can be widely applied to the fields of environmental protection, ferrous metallurgy and waste heat recovery.
Description
Technical Field
The invention relates to a waste incineration fly ash fusion treatment system, in particular to a waste incineration fly ash fusion treatment system by utilizing waste heat of liquid blast furnace slag.
Background
The municipal solid waste incineration treatment technology has the advantages of large volume reduction range, land saving, capability of recovering chemical energy in the waste and the like, and is the mainstream municipal solid waste harmless treatment mode at present. However, a large amount of fly ash is generated in the incineration process of garbage, and the amount of fly ash generated in a garbage incineration plant with a daily garbage disposal amount of 5200 tons is 200 tons or more. The diameter of fly ash powder generated by garbage incineration is generally less than 300 mu m, most of the fly ash powder is concentrated in the range of 20-125 mu m, the main components are Ca, Si, Al, K, Na, Cl, Fe, Mg and other elements, and meanwhile, a certain amount of Pb, Cr, Cd, Hg, Ni, As, Cu, Zn and other trace elements are also contained. In addition, the fly ash is also enriched with dioxin generated in the waste incineration process, so that the fly ash has strong toxicity, belongs to dangerous solid waste and poses great threat to the natural environment and human health. At present, the widely adopted waste incineration fly ash treatment methods at home and abroad comprise: the method comprises the steps of direct landfill, cement solidification landfill, medicament treatment, melting solidification and the like, wherein the melting solidification method has the advantages of strong volume reduction capability, high dioxin decomposition degree, good heavy metal solidification effect and the like, and becomes a garbage incineration fly ash treatment method with the greatest development prospect. However, the heating methods such as high temperature plasma heating, arc furnace heating, and resistance furnace heating, which are commonly used in the melting and solidifying method, consume a large amount of electric energy, and thus the economical efficiency of the technical route is reduced. The temperature of liquid blast furnace slag discharged in the blast furnace ironmaking process can reach 1450-. On one hand, the liquid blast furnace slag can be used as a free heat source to provide conditions for melting the waste incineration fly ash, so that dioxin is completely decomposed. On the other hand, the blast furnace slag component is similar to fly ash, and can be mixed and melted with the waste incineration fly ash in a normal temperature state, the composite melt can form a vitreous body after being quenched, the dual solidification of heavy metal can be realized, and the product can be directly used as a building material. The technology can simultaneously realize the utilization of the waste heat of the liquid blast furnace slag and the melting harmless treatment and resource utilization of the waste incineration fly ash, and has very bright development prospect. However, no waste incineration fly ash fusion treatment waste heat recovery system using waste heat of liquid blast furnace slag has been proposed, and development is urgently needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a system for melting and treating waste incineration fly ash by using waste heat of liquid blast furnace slag.
A melting treatment system for waste incineration fly ash by using waste heat of liquid blast furnace slag comprises a fly ash feeder, a blast furnace, a melting mixing device, a fly ash mixer, a high-temperature gas mixer, a slag granulating device, a moving bed waste heat recovery device and a cyclone separator; the method is characterized in that: high-temperature liquid blast furnace slag is discharged from the blast furnace and is mixed and melted with fly ash discharged from a fly ash feeder in a melting and mixing device; the melting mixing device is provided with additional heat by a heater, so that the melting mixture of the fly ash and the blast furnace slag is in a high-temperature state, and the fluidity of the melting mixture is ensured; then, the molten mixture of the fly ash and the blast furnace slag discharged by the molten mixing device enters a slag granulation device for granulation; meanwhile, heat exchange is carried out between the high-temperature liquid drops and the low-temperature air in the granulating device, the high-temperature liquid drops are rapidly solidified into fine solid particles, and hot air is obtained; solid particles are discharged from an outlet of the slag granulating device to the interior of the moving bed waste heat recovery device to exchange heat with cold air, and the solid particles after heat exchange are discharged from the bottom of the moving bed waste heat recovery device; the high-temperature gas discharged by the melting mixing device, the slag granulating device and the moving bed waste heat recovery device is mixed in a high-temperature gas mixer, the mixed gas is dedusted by a cyclone separator and then enters a waste heat boiler, and secondary fly ash obtained by separation enters a fly ash mixer and is mixed with initial fly ash.
According to the preferable scheme of the system for melting and treating the waste incineration fly ash by utilizing the waste heat of the liquid blast furnace slag, the melting and mixing device comprises a shell, a first baffle plate and a second baffle plate, wherein the first baffle plate and the second baffle plate are longitudinally arranged in the shell and divide the shell into a feeding cavity, a melting and mixing cavity and a discharging cavity; the melting and mixing chamber is positioned between the feeding chamber and the discharging chamber, the rear end of the first baffle plate and the front end of the second baffle plate are respectively and vertically connected with the rear panel and the front panel of the shell, a certain gap I is formed between the front end surface of the first baffle plate and the front panel of the shell, and a certain gap II is formed between the rear end surface of the second baffle plate and the rear panel of the shell; the first and second gaps are used as fluid flow channels.
A film-making boss is arranged in the melting and mixing cavity along the horizontal direction; the left end and the right end of the film-making boss are respectively connected with the first baffle plate and the second baffle plate, a baffle is arranged on the upper end face of the film-making boss and is positioned at the rear end of the film-making boss, and the film-making boss is heated by a heater; the first baffle plate and the second baffle plate are used for guiding the molten mixture to flow according to a required path, have a heat insulation effect on the molten mixing cavity and enhance the heating effect of the combustor on a molten slag liquid film.
The fly ash feeding device is characterized in that a fly ash feeding hole and a slag inlet are formed in the feeding cavity, and an exhaust port and a slag discharge port are formed in the discharging cavity.
The waste incineration fly ash and the liquid blast furnace slag entering from the fly ash feeding hole and the slag inlet are mixed in the feeding chamber and then flow through the first gap to enter the melting and mixing chamber, when the height of the fluid reaches the height of the upper end face of the film-making boss, a thin liquid film is formed on the surface of the film-making boss due to the blocking effect of the baffle plate, the heater heats the thin liquid film to raise the temperature of the thin liquid film so as to realize the complete melting of the fly ash, when the height of the thin liquid film is greater than the height of the baffle plate, part of the fluid flows over the baffle plate and flows through the second gap to enter the discharging chamber, and the molten mixture of the fly ash and the liquid blast furnace slag continues to be homogenized in the flowing process and finally is discharged from the slag outlet.
According to the preferable scheme of the system for melting and treating the waste incineration fly ash by utilizing the waste heat of the liquid blast furnace slag, the heater is an electric arc heater, a plasma heater or a burner, and the burner burns combustible gas to generate heat.
According to the preferable scheme of the system for melting and treating the waste incineration fly ash by utilizing the waste heat of the liquid blast furnace slag, a third baffle plate is arranged on one side of the first baffle plate close to the feeding chamber, the front end of the third baffle plate is connected with the front panel of the shell, a certain gap III is formed between the rear end of the third baffle plate and the rear panel of the shell, the gap III is used as a flow channel for the waste incineration fly ash and the liquid blast furnace slag, and the waste incineration fly ash and the liquid blast furnace slag entering from the fly ash feeding port and the slag inlet 33 firstly flow through the gap III and then flow into the melting and mixing chamber.
According to the preferable scheme of the system for melting and treating the waste incineration fly ash by utilizing the waste heat of the liquid blast furnace slag, one side of the second baffle plate close to the discharge chamber is provided with the fourth baffle plate, the rear end of the fourth baffle plate is connected with the rear panel of the shell, the front end of the fourth baffle plate and the front panel of the shell are provided with a certain gap IV, the gap IV is used as a flow channel of a molten mixture, and the molten mixture flowing out of the film forming boss 38 passes through the gap IV and is discharged through the slag discharge port.
The waste incineration fly ash melting treatment system utilizing the waste heat of the liquid blast furnace slag has the beneficial effects that: the waste incineration fly ash and the liquid blast furnace slag are mixed and melted, so that low-energy-consumption and high-efficiency harmless treatment of the waste incineration fly ash and waste heat utilization of the liquid blast furnace slag are realized, the glass body net structure formed by the composite melt after quenching can effectively solidify heavy metal elements, the product can be directly used as an additive of cement clinker, and resource utilization of the waste incineration fly ash is realized; therefore, the invention has obvious energy-saving and emission-reducing benefits and can be widely applied to the fields of environmental protection, ferrous metallurgy and waste heat recovery.
Drawings
FIG. 1 is a schematic structural diagram of a system for melting and treating waste incineration fly ash by using waste heat of liquid blast furnace slag according to the present invention.
Fig. 2 is a schematic view of the structure of the melt-mixing device 3.
Fig. 3 is a front view of fig. 2.
Fig. 4 is a top view of fig. 2.
FIG. 5 is a schematic view of the structure of a melt mixing device 3 having a plurality of baffles.
Detailed Description
Referring to fig. 1 to 5, the system for melting and treating waste incineration fly ash by using waste heat of liquid blast furnace slag comprises a fly ash feeder 1, a blast furnace 2, a melting and mixing device 3, a fly ash mixer 5, a high-temperature gas mixer 6, a slag granulating device 7, a moving bed waste heat recovery device 9, a cyclone separator 4, a first fan 8 and a second fan 10; the fly ash feeder 1 and the blast furnace 2 are communicated with the melting and mixing device 3, the slag granulating device 7 is communicated with the melting and mixing device 3, the high-temperature gas mixer 6 and the moving bed waste heat recovery device 9, the high-temperature gas mixer 6 is communicated with the melting and mixing device 3, the moving bed waste heat recovery device 9 and the cyclone separator 11, and the fly ash mixer 5 is communicated with the fly ash feeder 1 and the cyclone separator 11.
High-temperature liquid blast furnace slag is discharged from the blast furnace 2 and is mixed and melted with fly ash discharged from a fly ash feeder 1 in a melting and mixing device 3; the melting and mixing device 3 is provided with additional heat by a heater 34, so that the melting and mixing mixture of the fly ash and the blast furnace slag is in a high-temperature state, and the fluidity of the melting and mixing mixture is ensured; the molten mixture of the fly ash and the blast furnace slag discharged from the melting and mixing device 3 enters a slag granulation device 7 for granulation; meanwhile, heat exchange is carried out between the high-temperature liquid drops and the low-temperature air in the granulating device 7, the high-temperature liquid drops are rapidly solidified into fine solid particles, and hot air is obtained; the solid particles have higher temperature at this time, the solid particles are discharged from the outlet of the slag granulating device 7 to the inside of the moving bed waste heat recovery device 9 to exchange heat with cold air, the heat in the particles is further recovered, and the solid particles after heat exchange are discharged from the bottom of the moving bed waste heat recovery device 9; high-temperature gas discharged by the melting mixing device 3, the slag granulating device 7 and the moving bed waste heat recovery device 9 is mixed in a high-temperature gas mixer 6, the mixed gas is dedusted by a cyclone separator 4 and then enters a waste heat boiler, and secondary fly ash obtained by separation enters a fly ash mixer 5 and is mixed with initial fly ash. The first fan 8 provides low-temperature air for the slag granulation device 7, and the second fan 10 provides low-temperature air for the moving bed waste heat recovery device 9.
A waste incineration fly ash melting treatment device utilizing waste heat of liquid blast furnace slag comprises a shell 32, a heater 34, a film forming boss 38, a first baffle plate 39 and a second baffle plate 30, wherein the first baffle plate 39 and the second baffle plate 30 are longitudinally arranged in the shell 32, and the shell 32 is divided into a feeding chamber, a melting mixing chamber and a discharging chamber by the first baffle plate 39 and the second baffle plate 30; the melting and mixing chamber is positioned between the feeding chamber and the discharging chamber, the rear end of the first baffle plate 39 and the front end of the second baffle plate 30 are respectively and vertically connected with the rear panel and the front panel of the shell 32, a certain gap I is formed between the front end surface of the first baffle plate 39 and the front panel of the shell 32, and a certain gap II is formed between the rear end surface of the second baffle plate 30 and the rear panel of the shell 32; the first and second gaps are used as fluid flow channels;
a film forming boss 38 is arranged in the melting and mixing cavity along the horizontal direction; the left end and the right end of the film forming boss 38 are respectively connected with the first baffle plate 39 and the second baffle plate 30, the upper end face of the film forming boss 38 is provided with a baffle plate 36, the baffle plate 36 is positioned at the rear end of the film forming boss 38, and the film forming boss 38 is heated by a heater 34; the film-forming boss is used for generating a slag film and enhancing the heating effect of the combustor on the slag liquid film.
The fly ash feeding port 31 and the slag inlet 33 are arranged in the feeding cavity, and the exhaust port 35 and the slag discharge port 37 are arranged in the discharging cavity.
The waste incineration fly ash and the liquid blast furnace slag entering from the fly ash inlet 31 and the slag inlet 33 are mixed in the feeding chamber, then flow through the first gap and enter the melting and mixing chamber, when the height of the fluid reaches the height of the upper end surface of the film-making boss 38, a thin liquid film is formed on the surface of the film-making boss 38 due to the blocking effect of the baffle plate 36, the heater 34 heats the thin liquid film to raise the temperature of the thin liquid film so as to realize the complete melting of the fly ash, when the height of the thin liquid film is greater than the height of the baffle plate 36, part of the fluid crosses the baffle plate 36 and flows through the second gap and enters the discharging chamber, the melting and mixing of the fly ash and the liquid blast furnace slag continues to be homogenized in the flowing process, and finally is discharged through the slag discharge port 37.
In an exemplary embodiment, the height of the baffle 36 is determined by the flow rate of the composite melt, the physical properties, and the like. The heater 34 is an arc heater, a plasma heater, or a burner that burns combustible gas to generate heat. The heater 34 is disposed above the film forming boss 38, and the distance between the heater 34 and the upper surface of the film forming boss 38 depends on the temperature of the composite melt flowing to the surface of the film forming boss 38, the structural form of the heater, the type of fuel used by the heater 34, and the like.
In a specific embodiment, a baffle plate three 311 is arranged on one side of the baffle plate one 39 close to the feeding chamber, the front end of the baffle plate three 311 is connected with the front panel of the shell 32, a certain gap three is formed between the rear end of the baffle plate three 311 and the rear panel of the shell 32, the gap three is used as a flow channel for the waste incineration fly ash and the liquid blast furnace slag, and the waste incineration fly ash and the liquid blast furnace slag entering from the fly ash feeding port 31 and the slag feeding port 33 flow into the melting and mixing chamber first and then flow into the gap three.
A fourth baffle plate 310 is arranged on the second baffle plate 30 close to the discharge chamber, the rear end of the fourth baffle plate 310 is connected with the rear panel of the shell 32, the front end of the fourth baffle plate 310 and the front panel of the shell 32 are provided with a certain gap IV which is used as a molten mixture flow channel, and the molten mixture flowing out of the film forming boss 38 passes through the gap IV and is discharged through the slag discharge port 37.
In a particular embodiment, a thermocouple 312 is provided near the slag discharge opening 37 for direct measurement of the slag outlet temperature.
In a specific embodiment, the baffles may be provided in plurality in the left and right directions of the casing 32, and adjacent baffles are staggered in front and rear to increase the flow distance of the fluid.
The working process of the melting and mixing device 3 of the invention is as follows: the liquid blast furnace slag discharged from the blast furnace 2 enters the melting and mixing device 3 from the slag inlet 33, meanwhile, the waste incineration fly ash discharged from the fly ash feeder 1 enters the melting and mixing device 3 through the fly ash inlet 31, and the liquid blast furnace slag and the fly ash are mixed in the melting and mixing device 3 and flow along the broken line under the blocking of the first baffle plate 39. When the molten mixture of fly ash and blast furnace slag flows to the upper end surface of the film forming projection 38, a thin liquid film is formed on the surface of the film forming projection 38 under the blocking action of the baffle 36, and the temperature of the thin liquid film is increased by the heat from the burner 34, and the complete melting of the fly ash is realized. When the height of the thin liquid film is larger than that of the baffle 36, part of the fluid turns over the baffle 36 and flows through the second gap to enter the discharging chamber, and the molten mixture of the fly ash and the liquid blast furnace slag is continuously homogenized in the flowing process and finally discharged from the slag discharging port 37.
Because the mixture of the fly ash and the blast furnace slag is still in a molten state and has higher temperature after being discharged, the high-efficiency waste heat recovery and resource utilization can be easily carried out. In addition, the gas generated by combustion and the volatile gas released by heating the fly ash are exhausted from the device through the exhaust port 35 for subsequent tail gas treatment.
It should be noted that the high-temperature gas discharged from the melting and mixing device, the slag granulating device, and the moving bed waste heat recovery device may be mixed by the high-temperature gas mixer, dedusted by the cyclone separator and then fed into the waste heat boiler, or may be dedusted and then fed into different temperature sections of the waste heat boiler for heat exchange.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (4)
1. A melting treatment system for waste incineration fly ash by using waste heat of liquid blast furnace slag comprises a fly ash feeder (1), a blast furnace (2), a melting mixing device (3), a fly ash mixer (5), a high-temperature gas mixer (6), a slag granulating device (7), a moving bed waste heat recovery device (9) and a cyclone separator (4); the method is characterized in that: high-temperature liquid blast furnace slag is discharged from the blast furnace (2) and is mixed and melted with fly ash discharged from a fly ash feeder (1) in a melting and mixing device (3); the melting mixing device (3) is provided with additional heat by a heater (34) to enable the melting mixture of the fly ash and the blast furnace slag to be in a high-temperature state and ensure the fluidity of the melting mixture; the molten mixture of the fly ash and the blast furnace slag discharged by the melting and mixing device (3) enters a slag granulation device (7) for granulation; meanwhile, heat exchange is carried out between the high-temperature liquid drops and low-temperature air in the slag granulating device (7), the high-temperature liquid drops are rapidly solidified into fine solid particles, and hot air is obtained; solid particles are discharged from an outlet of the slag granulating device (7) to the interior of the moving bed waste heat recovery device (9) to exchange heat with cold air, and the solid particles after heat exchange are discharged from the bottom of the moving bed waste heat recovery device (9); high-temperature gas discharged by the melting mixing device (3), the slag granulating device (7) and the moving bed waste heat recovery device (9) is mixed in a high-temperature gas mixer (6), the mixed gas is dedusted by a cyclone separator (4) and then enters a waste heat boiler, and secondary fly ash obtained by separation enters a fly ash mixer (5) and is mixed with initial fly ash;
the melting and mixing device (3) comprises a shell (32), a first baffle plate (39) and a second baffle plate (30); a first baffle plate (39) and a second baffle plate (30) are longitudinally arranged in the shell (32), and the first baffle plate (39) and the second baffle plate (30) divide the shell (32) into a feeding cavity, a melting and mixing cavity and a discharging cavity; the melting and mixing chamber is positioned between the feeding chamber and the discharging chamber, the rear end of the first baffle plate (39) and the front end of the second baffle plate (30) are respectively and vertically connected with the rear panel and the front panel of the shell (32), a certain gap I is formed between the front end surface of the first baffle plate (39) and the front panel of the shell (32), and a certain gap II is formed between the rear end surface of the second baffle plate (30) and the rear panel of the shell (32); the first and second gaps are used as fluid flow channels;
a film forming boss (38) is arranged in the melting and mixing cavity along the horizontal direction; the left end and the right end of the film forming boss (38) are respectively connected with a first baffle plate (39) and a second baffle plate (30), a baffle plate (36) is arranged on the upper end face of the film forming boss (38), the baffle plate (36) is positioned at the rear end of the film forming boss (38), and the film forming boss (38) is heated by a heater (34);
a fly ash feeding hole (31) and a slag inlet (33) are formed in the feeding cavity, and an exhaust port (35) and a slag discharge port (37) are formed in the discharging cavity;
the waste incineration fly ash and the liquid blast furnace slag entering from the fly ash inlet (31) and the slag inlet (33) are mixed in the feeding chamber and then flow through the gap to enter the melting mixing chamber, when the height of the fluid reaches the height of the upper end surface of the film forming boss (38), a thin liquid film is formed on the surface of the film forming boss (38) due to the blocking effect of the baffle (36), and the heater (34) heats the thin liquid film to raise the temperature of the thin liquid film so as to realize the complete melting of the fly ash; the first baffle plate and the second baffle plate are used for guiding the molten mixture to flow according to a required path, have a heat insulation effect on the molten mixing chamber and strengthen the heating effect of the combustor on the thin liquid film; when the height of the thin liquid film is larger than that of the baffle (36), part of the fluid turns over the baffle (36), flows through the second gap, enters the discharging cavity and is discharged from the slag discharging port (37).
2. The system for melting and processing waste incineration fly ash by using waste heat of liquid blast furnace slag according to claim 1, wherein: the heater (34) is an arc heater, a plasma heater or a burner that burns a combustible gas to generate heat.
3. The system for melting and processing waste incineration fly ash by using waste heat of liquid blast furnace slag according to claim 1, wherein: and a third baffle plate (311) is arranged on one side of the first baffle plate (39) close to the feeding cavity, the front end of the third baffle plate (311) is connected with the front panel of the shell (32), a certain gap III is formed between the rear end of the third baffle plate (311) and the rear panel of the shell (32), and the gap III is used as a flow channel for the waste incineration fly ash and the liquid blast furnace slag, so that the waste incineration fly ash and the liquid blast furnace slag entering from the fly ash feeding hole (31) and the slag inlet (33) flow through the gap III and then flow into the melting and mixing cavity.
4. The system for melting and processing waste incineration fly ash by using waste heat of liquid blast furnace slag according to claim 1, wherein: a fourth baffle plate (310) is arranged on one side of the second baffle plate (30) close to the discharge chamber, the rear end of the fourth baffle plate (310) is connected with the rear panel of the shell (32), the front end of the fourth baffle plate (310) and the front panel of the shell (32) have a certain gap IV, and the gap IV is used as a molten mixture flowing channel, so that the molten mixture flowing out of the film forming boss (38) passes through the gap IV and is discharged through the slag discharge port (37).
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