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CN-122008381-A - Cold bonding aggregate granulation equipment of msw incineration flying ash

CN122008381ACN 122008381 ACN122008381 ACN 122008381ACN-122008381-A

Abstract

The invention discloses a cold bonding aggregate granulating device for waste incineration fly ash, which relates to the technical field of solid waste recycling and comprises a shell component, a central driving and liquid distribution system, a feeding and guiding system, a super-gravity reaction rotor, an edge granulating mechanism, a bottom maintenance discharging system and a gas phase sensing system. The invention utilizes a feeding and guiding system to convey and crush fly ash materials, then carries out supergravity carbonization and chelating spraying treatment through a central driving and liquid distribution system, a supergravity reaction rotor and a gas phase system, forms fly ash slurry, carries out extrusion compact molding through an edge granulating mechanism, and discharges molded cold bonding aggregate from a star-shaped discharge valve after being cured by a bottom curing and discharging system. The invention organically combines the high-efficiency chemical reaction under the hypergravity field with the high-strength physical extrusion molding, solves the problems of low carbonization rate, low aggregate strength and high leaching risk in the prior art, and continuously prepares the high-density and low-leaching fly ash-based aggregate by a one-step method.

Inventors

  • SU ZIPENG
  • SUN XIAOLONG
  • QIN XIAO
  • HE MU
  • ZHAO TIANYUAN
  • LIU ZHISHENG

Assignees

  • 广东工业大学

Dates

Publication Date
20260512
Application Date
20260210

Claims (9)

  1. 1. The equipment for granulating the cold bonding aggregate of the waste incineration fly ash is characterized by comprising, The shell assembly comprises a cylindrical shell (11) which is vertically arranged, a conical discharge hopper (12) which is positioned at the bottom of the cylindrical shell (11), and a temperature control jacket (13) which is arranged on the outer walls of the cylindrical shell (11) and the conical discharge hopper (12); The central driving and liquid distributing system comprises a driving motor (21), a rotary joint (22) arranged at the bottom of the driving motor (21), a chelating agent liquid inlet (23) connected with the rotary joint (22), a hollow main shaft (24) extending into the cylindrical shell (11), and a plurality of liquid-phase atomizing nozzles (25) arranged on the hollow main shaft (24); The super-gravity reaction rotor comprises an upper cover plate (41), a rotor fixing rod (42) with two ends respectively connected with the upper cover plate (41) and the hollow main shaft (24), a silk screen corrugated filler layer (43) arranged below the upper cover plate (41) and a lower chassis (44) arranged below the silk screen corrugated filler layer (43); The edge granulating mechanism comprises a plurality of roller mounting brackets (51) which are uniformly distributed along the circumference of the supergravity reaction rotor, flexible rollers (52) which are arranged on the roller mounting brackets (51), elastic stirring sheets (53) which are arranged behind each flexible roller (52), elastic scraping plates (54) which are arranged between two adjacent flexible rollers (52), and a plurality of wear-resistant lining plates (55) which are arranged on the inner wall of the cylindrical shell (11); The bottom maintenance discharging system comprises a waste heat steam interface (61) positioned on the right side wall of the discharge hopper (12), an annular gas distribution plate (62) which is arranged inside the discharge hopper (12) and connected with the waste heat steam interface (61), and a star-shaped discharge valve (63) arranged at the bottom of the discharge hopper (12).
  2. 2. The equipment for granulating the cold bonding aggregate of the waste incineration fly ash according to claim 1, which is characterized by further comprising a feeding and guiding system, a feeding device and a granulating device, wherein the feeding and guiding system comprises a spiral feeding pipe (31) arranged at the top of the cylindrical shell (11), a guiding cone (32) fixed on the hollow main shaft (24) and a dynamic throwing disc (33) arranged below the guiding cone (32); The gas phase sensing system comprises a plurality of high-pressure CO 2 gas inlet nozzles (71) which are arranged around the outer wall of the cylindrical shell (11), a gas filtering return port (72) which is arranged at the top of the right side wall of the cylindrical shell (11), a pressure temperature sensor (73) which is arranged below the gas filtering return port (72), and a steam outlet (74) which is arranged at the top of the left side wall of the discharge hopper (12).
  3. 3. The apparatus for granulating cold-bonded aggregate by incineration fly ash according to claim 1, wherein the temperature-controlled jacket (13) comprises a temperature-controlled liquid inlet (131) arranged at the left bottom of the conical discharge hopper (12) and a temperature-controlled liquid outlet (132) arranged below the spiral feed pipe (31).
  4. 4. The apparatus for granulating cold-bonded aggregate of waste incineration fly ash according to claim 1, wherein the liquid-phase atomizing nozzle (25) comprises a nozzle body (251), a spray cap (252) connected to the nozzle body (251), and a spray head (253) provided at the end of the liquid-phase atomizing nozzle (25).
  5. 5. The device for granulating the cold-bonded aggregate of the waste incineration fly ash according to claim 2, wherein the top of the diversion cone (32) is connected with the hollow main shaft (24) through a diversion cone fixing rod (321).
  6. 6. The apparatus for granulating cold bonded aggregate of waste incineration fly ash according to claim 1, wherein the roller mounting bracket (51) is rigidly connected to the outer edge of the super-gravity reaction rotor and revolves synchronously with the rotor; the flexible roller (52) is rotatably arranged in the roller mounting bracket (51) through a roller pin shaft (521), and a plurality of hemispherical forming grooves (522) are formed in the surface of the flexible roller; The wear-resistant lining plate (55) enables the granulating area to form a tapered extrusion runner so as to realize edge extrusion granulation.
  7. 7. The device for granulating the cold-bonded aggregate of the waste incineration fly ash according to claim 1, wherein a fixed metal sheet (57) is clamped between the elastic scraper blade (54) and the scraper blade auxiliary fixed plate (56), a plurality of fixed screws (58) are arranged on the fixed metal sheet (57), and the fixed screws (58) fasten the fixed metal sheet (57) so as to realize the fixed connection between the elastic scraper blade (54) and the scraper blade auxiliary fixed plate (56); The scraper auxiliary fixing plate (56) is fixed on the periphery of the hypergravity reaction rotor and is positioned between two adjacent flexible rollers (52).
  8. 8. The apparatus for granulating cold bonded aggregates of waste incineration fly ash according to claim 1, wherein the annular gas distribution plate (62) comprises a plurality of steam nozzles (621) uniformly arranged around the top thereof.
  9. 9. The apparatus for granulating the cold-bonded aggregate of the waste incineration fly ash according to claim 2, wherein the pressure and temperature sensor (73) comprises a temperature detection probe (731), a pressure sensing element (732) connected with one end of the temperature detection probe (731), a sensor body (733) connected with one end of the pressure sensing element (732), and a microprocessor (734) connected with the sensor body (733).

Description

Cold bonding aggregate granulation equipment of msw incineration flying ash Technical Field The invention relates to the technical field of solid waste recycling, in particular to a device for granulating a cold-bonded aggregate of incineration fly ash of household garbage for preparing high-strength low-leaching aggregate by using the incineration fly ash of the household garbage. Background With the acceleration of the urban process, the household garbage incineration power generation has become a mainstream garbage disposal mode. However, the fly ash generated during incineration of the household garbage is about 3% -5% of the total amount of garbage incineration. Because the fly ash is rich in Pb, cd, cr, zn and other heavy metals, dioxin and other persistent organic pollutants. At present, disposal of fly ash is largely divided into two major categories, solidification/stabilization landfill and recycling. However, existing fly ash granulation and curing techniques suffer from the significant disadvantage that, first, the forming mechanism defects result in low strength. The existing disc or drum granulation mainly relies on material rolling agglomeration, and lacks forced mechanical extrusion, so that the prepared aggregate has loose internal structure and high porosity, and the crushing value of the aggregate is difficult to meet the use requirement of high-grade road engineering. Second, mass transfer limitations result in low carbonization efficiency. The traditional standing mode of granulating firstly and curing later is limited by gas-solid mass transfer resistance, CO 2 is difficult to penetrate into the inside of particles, a shell structure with hard outside and soft inside is easy to form, carbonization is incomplete, and the curing period is too long. Finally, process cleavage results in unstable curing. The separation of the medicament mixing and granulating processes leads to uneven dispersion of the chelating agent on a microscopic scale, the omnibearing wrapping and reaction of heavy metals can not be realized, and the secondary leaching risk still exists in a long-term environment. Therefore, there is a need for a device that can organically combine high-efficiency chemical reaction (rapid carbonization and chelation) under a hypergravity field with high-strength physical extrusion molding, and continuously realize innocent treatment of fly ash and preparation of high-strength aggregate in the same device, so as to solve the problems of low strength, high leaching risk and long production period of the existing cold-bonded aggregate. Disclosure of Invention The present invention has been made in view of the above-mentioned or existing problems occurring in the prior art. Therefore, the invention aims to provide the cold-bonded aggregate granulating equipment for the waste incineration fly ash, and aims to solve the problems of low carbonization reaction rate, high porosity of the cold-bonded aggregate, low road strength and high long-term leaching risk of heavy metals in the existing fly ash recycling technology. The invention prepares the high-density and low-leaching fly ash-based aggregate by a one-step method through the organic combination of micron-sized gas-liquid-solid mass transfer and edge forced extrusion granulation in a hypergravity field. In order to achieve the aim, the invention provides the following technical scheme that the cold bonding aggregate granulation equipment for the waste incineration fly ash comprises, The shell assembly comprises a cylindrical shell arranged vertically, a conical discharge hopper arranged at the bottom of the cylindrical shell, and a temperature control jacket arranged on the outer wall of the cylindrical shell and the conical discharge hopper. The central driving and liquid distributing system comprises a driving motor, a rotary joint arranged at the bottom of the driving motor, a chelating agent liquid inlet connected with the rotary joint, a hollow main shaft extending into the cylindrical shell, and a plurality of liquid-phase atomizing nozzles arranged on the hollow main shaft. The supergravity reaction rotor comprises an upper cover plate, rotor fixing rods, a silk screen corrugated packing layer and a lower chassis, wherein the two ends of the rotor fixing rods are respectively connected with the upper cover plate and the hollow main shaft, the silk screen corrugated packing layer is arranged below the upper cover plate, and the lower chassis is arranged below the silk screen corrugated packing layer. The edge granulating mechanism comprises a plurality of roller mounting brackets uniformly distributed along the circumference of the supergravity reaction rotor, flexible rollers mounted on the roller mounting brackets, elastic stirring sheets arranged at the rear of each flexible roller, elastic scraping plates arranged between two adjacent flexible rollers, and a plurality of wear-resistant lining plates arranged on the inner wall