CN116637910A - Method and system for stale garbage screening and product cascade resource utilization - Google Patents

Abstract

The invention provides a method and a system for screening stale garbage and recycling products in a cascade manner, and belongs to the technical field of garbage treatment. The method comprises the following steps: pretreating the stale garbage stack to obtain a garbage stack with low water and low harmful gas; transporting the garbage stack to a garbage disposal site by adopting a garbage transport vehicle, and carrying out material refining treatment on the garbage stack; screening the garbage after refining to obtain massive combustible substances, primary combustible substances, aggregate, iron, stainless steel, nonferrous metals and purer humus soil; carrying out product cascade recycling treatment on the large combustible matters and the primary combustible matters to obtain purer humus soil, iron, stainless steel, nonferrous metals, aggregate and small combustible matters; making small combustible into fuel rod; the system comprises a screening system and a product cascade recycling system. The method can separate purer aggregate, humus soil, metal and combustible materials, and effectively realize resource utilization.

Description

Method and system for stale garbage screening and product cascade resource utilization

technical field

The invention relates to the technical field of garbage treatment, in particular to a method and system for stale garbage screening and product cascading recycling.

Background technique

Most of the domestic waste is in a state of disorderly stacking, and all unclassified domestic waste enters the landfill for landfill. The high moisture content of stale garbage can easily lead to great fluctuations in the screening effect. Due to the difference in the composition of landfill waste, the proportion of humus soil fluctuates between 10%-40%. The proportion of humus soil in stale waste is 30%-60%. The content of organic matter is high, but the screening quality is poor due to high humidity. Some small pieces of combustibles will be entrained in the humus, some large pieces of combustibles and high-density combustibles will not be removed through sorting, and the light ones are difficult to incinerate as garbage. The end product disposal and Resource utilization is limited, and most materials still need to be landfilled, which fails to achieve the purpose of reducing stale waste, controlling pollution, and vacating storage capacity.

The humus in the stale garbage can be used for land use, but the humus screened out in the actual landfill treatment project often has a high content of combustibles; although the humus used for pit backfill and slope repair can reduce the external Transportation costs, but further stabilization treatment is required; if it is used as landscaping soil, it also needs stabilization treatment to meet the standards of greening soil. Moreover, the traditional stale waste screening treatment technology often causes shutdowns due to material blockage and entanglement in practical applications, and the screening capacity is limited; there are many harmful substances such as plastics mixed with aggregate and humus in the screening products, and at the same time light The humus contained in the heavy material is more, so that the unit calorific value of the light material is not high, which affects the replacement of its fuel. How to comprehensively consider the pretreatment of bulky waste and easily entangled waste in the process route, and the optimal combination of different screening equipment are important issues to be solved urgently in this industry.

Contents of the invention

The present invention provides a method and system for stale waste screening and product cascade recycling, which are used to solve the following problems in the processing process of stale waste in the prior art: during the screening process, the shutdown is caused by material blockage and entanglement, and the screening The screening capacity is limited; there are more harmful substances such as plastics mixed with aggregate and humus in the screened products, and at the same time, there are more humus in the light substances, so that the unit calorific value of the light substances is not high, which affects its performance. fuel substitution.

The present invention provides a stale garbage screening and product cascade recycling method, comprising:

Perform pretreatment on stale garbage dumps to obtain garbage dumps with low water content and low harmful gas;

The garbage dump is transported to the garbage disposal site by a garbage truck, and the garbage dump is homogenized;

The garbage after leveling is screened to screen out large combustibles, primary combustibles, aggregates, iron, stainless steel, non-ferrous metals and relatively pure humus;

The bulk combustibles and primary combustibles are processed step by step to obtain relatively pure humus, iron, stainless steel, non-ferrous metals, aggregates and small combustibles;

Turn small pieces of combustibles into fuel rods.

According to a stale garbage screening and product cascade recycling method provided by the present invention, the pretreatment includes:

Aeration equipment is used to aerate and pump air into the old garbage dump at the same time, so that the gas can form an internal circulation in the old garbage dump, so that the garbage dump can change from an anaerobic reaction environment to an aerobic reaction environment, and block harmful gases At the same time, it brings out the harmful gas and water vapor that have been produced in the garbage dump.

According to a method for stale garbage screening and product cascade resource recovery provided by the present invention, the pretreatment also includes:

The gas extracted from the aeration equipment is purified by the gas purification system, and the purified gas is discharged.

According to a method for stale garbage screening and product cascading recycling provided by the present invention, the homogenization treatment includes:

The garbage truck directly pours the garbage into the hopper of the stepping feeder, and the garbage passes through the leveler at the outlet of the stepping feeder to realize uniform feeding of the garbage, so that the garbage is evenly transported to the apron conveyor.

According to a stale garbage screening and product cascade recycling method provided by the present invention, the screening process includes:

Sorting the garbage from the outlet of the apron conveyor for large pieces, and separating the large pieces with a particle size greater than 350mm;

The separated large pieces are manually sorted and screened to obtain aggregates, and the remaining large pieces are large combustibles.

According to a stale garbage screening and product cascade recycling method provided by the present invention, the screening process also includes:

The garbage separated from large pieces is sent to the coarse screening tray for primary separation;

Send the undersize material selected by the coarse screening tray to the fine screening tray for secondary separation;

The under-screened material selected by the fine sieving pan selection is humus, and the humus is sequentially sent to the first baffle air separator, the first magnetic separator and the first eddy current separator, and the humus is separated from the humus Primary combustibles, iron, stainless steel and non-ferrous metals are sequentially separated from the soil to obtain relatively pure humus;

The sieve screened by the coarse screening pan is sent to the two-stage bouncing belt conveyor for sorting, and the light primary combustibles and the heavy aggregate mixture are sorted out, and the sorted aggregate mixture is sorted Send it to the second magnetic separator to sort out iron and aggregate;

The screened material selected by the fine screening pan is sent to the first-stage bounce belt conveyor for sorting, and the light primary combustibles and heavy aggregate mixture are sorted out, and the sorted aggregate mixture is sorted Send it to the second magnetic separator to separate iron and aggregate.

According to a method for stale garbage screening and product cascade recycling provided by the present invention, the two-stage bouncing belt conveyor is formed by connecting two groups of bouncing belt conveyors in series;

The sieved material of the coarse sieving disc screen first enters the first group of bouncing belt conveyors to separate the heavy aggregate mixture from the light ones;

The light materials continue to enter the second group of bounce belt conveyors, and the aggregate mixture that has not been sorted out is bounced and sorted again;

The bounce amplitude of the second group of bounce belt conveyors is larger than that of the first set of bounce belt conveyors.

According to a method for stale garbage screening and product cascade resource utilization provided by the present invention, the product cascade resource utilization process includes:

The primary combustibles sorted out from the screening process are sent to the first relaxation screen, and the surface soil of the primary combustibles is shaken off and screened to obtain relatively pure humus and relatively pure combustibles.

According to a method for stale garbage screening and product cascade resource utilization provided by the present invention, the product cascade resource utilization process also includes:

Sending the bulky combustibles sorted out from the screening process and the relatively pure combustibles screened out from the first relaxation sieve into a crusher for crushing to obtain small pieces of broken combustibles;

The small pieces of crushed matter are sent to the third magnetic separator, the second eddy current separator, the second relaxation screen, and the second baffle air separator in order to separate iron, stainless steel, non-ferrous metals, Relatively pure humus and aggregate, to obtain small pieces of combustibles;

Send small pieces of combustibles into the RDF forming box to make RDF fuel rods.

The present invention also provides a stale garbage screening and product cascade resource utilization system, the system is applied to the stale garbage screening and product cascade resource utilization method described above, the system includes a screening system and a product cascade resource utilization system;

The screening system includes: bulk material sorting, manual sorting, coarse screening pan screening, fine screening pan screening, two-stage bouncing belt conveyor, one-stage bouncing belt conveyor, first baffle air separator, second stage A magnetic separator, a second magnetic separator and a first eddy current separator;

Wherein, the bulk object outlet of the bulk object sorting is connected to the manual sorting, and the small block object outlet of the bulk object sorting is connected to the entrance of the coarse screening tray;

The undersize outlet of the coarse screening disc screen is connected to the inlet of the fine screening disc screen, and the undersize outlet of the fine screening disc screen is connected to the inlet of the first baffle wind separator, The outlet of the first baffle air separator is connected to the inlet of the first magnetic separator, and the outlet of the first magnetic separator is connected to the inlet of the first eddy current separator;

The oversize outlet of the coarse screening disc screen is connected to the inlet of the two-stage bouncing belt conveyor, and the lower sorted outlet of the two-stage bouncing belt conveyor is connected to the inlet of the second magnetic separator;

The oversize outlet of the fine sieving disc screen is connected to the inlet of the first-stage bouncing belt conveyor, and the lower sorted outlet of the first-stage bouncing belt conveyor is connected to the inlet of the second magnetic separator;

The product cascade recycling system includes: a first relaxation screen, a crusher, a third magnetic separator, a second eddy current separator, a second relaxation screen, a second baffle wind separator and an RDF forming box;

Wherein, the upper sorting object outlet of the two-stage bouncing belt conveyor and the upper sorting object outlet of the first-stage bouncing belt conveyor are all connected to the entrance of the first relaxation screen;

The oversize outlet of the first relaxation screen is connected with the inlet of the crusher, and the manual sorting is connected with the inlet of the crusher;

The outlet of the crusher is connected to the inlet of the third magnetic separator, the outlet of the third magnetic separator is connected to the inlet of the second eddy current separator, and the second eddy current separator The outlet of the said second relaxation screen is connected to the inlet;

The oversize outlet of the second relaxation screen is connected to the inlet of the second baffle air separator, and the outlet of the second baffle air separator is connected to the RDF forming chamber.

The present invention provides a stale waste screening and product cascade recycling method and system, which changes the degradation reaction conditions of organic matter in the waste heap by aerobic aeration to the stale waste heap, and gradually changes from anaerobic reaction to aerobic reaction , block the generation of harmful gases in the garbage dump, and extract the harmful gases and some water vapor that have been produced during the aeration process. Part of the water is evaporated, avoiding pollution during excavation and providing favorable conditions for subsequent screening;

The invention uses the stepping feeder as the first feeding device of the screening system, so that the garbage can be directly poured into the bin of the stepping feeder, reducing the use of the feeding device excavator or loader, Saves operating costs; the garbage is directly poured into the hopper of the stepping feeder, and there is no need to store garbage in the attachment of the feeding equipment, which reduces the construction area of the screening workshop and saves part of the construction cost;

The present invention uses the coarse screening disc screen and the fine screening disc screening screen to sort the particle size of garbage, replacing the drum sieve in the previous screening project. The sieve will block the sieve and the humus will form clods on the surface of the sieve surface, which needs to be shut down to clean up, which wastes time and human resources and affects the screening efficiency; the disc screen has its own cleaner, and it is not easy to be blocked. It can improve the screening efficiency and save operating costs; the floor space of the disc screen is smaller than that of the drum screen, which can make the screening system more compact and reduce the floor area of the screening system;

The present invention uses the first baffle air separator to air-select the humus. After the humus enters the first baffle air separator, in the process of falling, the upper part is sucked by an aspirator, and the mixed The small pieces of light combustibles are pumped away and collected by the cyclone collector; the air pressure is controlled by changing the frequency of the exhaust fan, and the wind pressure is adjusted to the strength that can extract small pieces of light combustibles, and because the humus soil is relatively wet , the density is relatively high, so that the humus soil is not easy to be extracted, so as to achieve the sorting effect of small pieces of combustibles;

The present invention uses the second baffle air separator to purify combustibles, obtain relatively pure small combustibles, and remove aggregates;

The present invention uses the first relaxation screen to purify the primary combustibles to obtain relatively pure combustibles, and the relatively pure combustibles and large combustibles enter the crusher for crushing, and after crushing, pass through the third magnetic separator, the second eddy current separator, The second relaxation screen and the second baffle winnowing machine remove impurities in the combustibles, so that relatively pure small pieces of combustibles are obtained, so that the calorific value of the RDF fuel rods made meets the fuel substitution standard.

Description of drawings

In order to more clearly illustrate the present invention or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are the present invention. For some embodiments of the invention, those skilled in the art can also obtain other drawings based on these drawings without creative effort.

Fig. 1 is a flow chart of the stale garbage screening and product cascade recycling method provided by the present invention.

Reference signs:

1. Aeration equipment; 2. Gas purification system; 3. Step feeder; 4. Homogenizer;

5. Slab conveyor; 6. Sorting of bulk objects; 7. Manual sorting;

8. Coarse screening pan screen; 9. Fine screening pan screen; 10-1. First baffle air separator;

10-2. The second baffle air separator; 11-1. The first magnetic separator; 11-2. The second magnetic separator;

11-3. The third magnetic separator; 12-1. The first eddy current separator;

12-2. The second eddy current separator; 13. Two-stage bouncing belt conveyor;

14. The first-level bouncing belt conveyor; 15-1. The first relaxation screen; 15-2. The second relaxation screen;

16. Crusher; 17. RDF forming box.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

A method and system for stale garbage screening and product cascading resource utilization according to the present invention will be described below in conjunction with FIG. 1 .

A method for stale garbage screening and product cascading recycling, comprising:

Perform pretreatment on stale garbage dumps to obtain garbage dumps with low water content and low harmful gas;

Specifically, the moisture content of the old garbage pile is 25%-30%. The pretreatment includes: using aeration equipment 1 to aerate and pump air into the old garbage pile at the same time, so that the gas forms an internal circulation in the old garbage pile, so that The garbage dump changes from an anaerobic reaction environment to an aerobic reaction environment, blocking the generation of harmful gases, and at the same time bringing out the harmful gases and water vapor that have been produced in the garbage dump;

The gas extracted by the aeration equipment 1 is purified by the gas purification system 2, and the purified gas is discharged; the gas purification system 2 adopts existing conventional gas purification equipment;

It can be understood that the aeration device 1 is connected to the garbage dump through the air extraction pipe; the waste gas outlet of the aeration device 1 is connected to the gas purification system 2; The gas is reduced, which avoids the risk of excavation, reduces the moisture content in the stale garbage, reduces the viscosity of the garbage, and improves the subsequent sorting efficiency.

The garbage dump is transported to the garbage disposal site by a garbage truck, and the garbage dump is homogenized;

Specifically, after the pretreatment, the garbage dump is first excavated by an excavator, and large objects larger than 500mm in particle size are removed during the excavation process, and the garbage is loaded into the garbage transport vehicle by the excavator;

The leveling process includes: the garbage transport vehicle directly pours the garbage into the silo of the stepping feeder 3, and the garbage passes through the leveling device 4 at the exit of the stepping feeder 3 to realize uniform feeding of the garbage and make the garbage uniform. Delivered on the slat conveyor 5;

It can be understood that the outlet of the step feeder 3 is connected to the apron conveyor 5; the step feeder 3 outlet is equipped with a homogenizer 4; The use of the loading machine excavator or loader reduces operating costs, and the volume of the stepping feeder 3 is ≥ 120 cubic meters.

The garbage after leveling is screened to screen out large combustibles, primary combustibles, aggregates, iron, stainless steel, non-ferrous metals and relatively pure humus;

Specifically, the screening process includes: sorting the garbage from the outlet of the apron conveyor 5 into bulk objects, and separating the bulk objects with a particle size greater than 350 mm; Automatically screen out large pieces with a particle size greater than 350mm;

The separated large pieces are manually sorted and screened to obtain aggregates, and the remaining large pieces are large pieces of combustibles;

The rubbish that separates out bulk is sent to coarse screening disc screen 8 and carries out primary sorting;

The undersieves selected by the coarse sieving tray sieve 8 are sent to the fine sieving tray sieve 9 for secondary separation;

The under-sieves selected by the fine sieving tray 9 are humus, and the humus is sent to the first baffle wind separator 10-1, the first magnetic separator 11-1 and the first eddy current separator in sequence. In the selection machine 12-1, the primary combustibles, iron, stainless steel and non-ferrous metals are sequentially separated from the humus to obtain relatively pure humus;

The oversize material selected by the coarse screening tray 8 is sent to the two-stage bouncing belt conveyor 13 for sorting, and the light primary combustibles and heavy aggregate mixture are sorted out, and the sorted bone The material mixture is sent in the second magnetic separator 11-2, and iron and aggregate are sorted out;

The oversize material selected by the fine sieving disc screen 9 is sent to the first-stage bounce belt conveyor 14 for sorting, and the light primary combustibles and heavy aggregate mixture are sorted out, and the sorted bone The material mixture is sent in the second magnetic separator 11-2, and iron and aggregate are sorted out;

Wherein, the two-stage bouncing belt conveyor 13 is formed in series by two groups of bouncing belt conveyors;

The sieved material of the coarse screening disc screen 8 first enters the first group of bouncing belt conveyors to separate the heavy aggregate mixture from the light ones;

The light materials continue to enter the second group of bounce belt conveyors, and the aggregate mixture that has not been sorted out is bounced and sorted again;

The bounce amplitude of the second group of bounce belt conveyors is larger than that of the first set of bounce belt conveyors.

In terms of specific structure, the coarse screening disc screen 8 is composed of 20 roller shafts, each roller shaft is evenly distributed with toothed discs, and the discs on the two connected roller shafts are staggered and rotated in the same direction to transport the garbage forward , during the conveying process, the garbage will be pulled to break the soil clods in the garbage, and the hole of the coarse screening disc screen 8 is a square hole of 40mm*40mm;

The garbage screened out by the coarse screening disc sieve 8 is the coarse disc sieve, and the coarse disc sieve enters the fine screening disc 9 for further screening, and the fine screening disc 9 is composed of 20 rollers. Composition, each roller shaft is evenly distributed with toothed disks, the disks on the two connected rollers are interlaced and rotated in the same direction to convey the garbage forward, and the garbage will be pulled during the transportation process to break the soil clods in the garbage The sieving hole of the sub-pan screen 9 is a rectangular hole of 20mm*8mm; the coarse screening pan screen 8 and the fine screening pan screen 9 are flat-shaped screening equipment, and the use of a flat screen instead of a cylindrical screen reduces the The height, length and width of the screening system reduce the area of the screening workshop. Coarse screening disc screen 8 and fine screening disc screen 9 are equipped with active cleaners, which can clean the clay stuck on the shaft in real time. Compared with the drum screen, it does not need to be shut down to clean the screen, which improves the screening efficiency.

The fine sieve tray screen 9 sieves the humus soil. Due to the long landfill time, part of the light matter is broken into small pieces and mixed in the humus soil, which affects the subsequent resource utilization of the humus soil. . The humus enters into the first deflected air separator 10-1, the first deflected air separator 10-1 is a suction air separator, and the whereabouts of the humus in the first deflected air separator 10-1 It is the draft air channel of the first deflecting air separator 10-1. During the process of the humus being folded and falling, the small pieces of combustibles in the humus are extracted by means of drafts, and passed through the first deflecting air separator 10. The cyclone collector in -1 separates the light primary combustibles, and the humus from the combustibles falls on the belt conveyor through the outlet of the first deflection air separator 10-1, and the belt conveyor passes through the first magnetic The separator 11-1 is connected with the first eddy current separator 12-1; the first baffle air separator 10-1 can purify the humus so as to reduce harmful substances such as plastics in the humus;

The humus from which primary combustibles have been separated passes through the first magnetic separator 11-1 to sort out iron, and the humus from which light primary combustibles and iron are separated enters the first eddy current separator for 12-1 minutes Stainless steel and non-ferrous metals are selected to obtain relatively pure humus, which can be used for landscaping and as construction soil.

The material on the screen of the coarse screening tray 8 enters the two-stage bouncing belt conveyor 13 for sorting. The two-stage bouncing belt conveyor 13 is formed by connecting two groups of bouncing belt conveyors in series. The feeding part of the bouncing belt conveyor is the bouncing section. Four round steels are evenly distributed on the idler cylinder in the bounce section. When the idler rotates with the belt, the belt is lifted up, so that the belt fluctuates periodically up and down, and the heavy aggregate receives less air resistance to obtain greater The upward force makes it easier to be bounced up, so that it rolls down and falls down. The light primary combustibles have a relatively small bounce and are brought to the conveyor area by high-speed belt speed. The maximum belt speed of the bounce belt machine is 3m/s, and the frequency conversion adjustable. The material on the screen of the coarse screening disc 8 first enters the first group of bouncing belt conveyors. The angle of the bouncing belt conveyors is between 20°-30°, so that the dense aggregate mixture rolls down at a large angle, and the belt conveyors During operation, it vibrates in waves, which intensifies the tumbling of the aggregate mixture, making the aggregate mixture roll to the lower part of the bouncing belt conveyor and sorted out from light objects. The sorted aggregate mixture is the upper sorting material of the first group of bouncing belt conveyors, and enters the second group of bouncing belt conveyors, and the unsorted aggregate mixture is bounced and sorted again. Since the first group of bouncing belt conveyors sorts out part of the aggregate mixture, the garbage entering the second group is reduced, and the bouncing range of the second group of bouncing belt conveyors is larger than that of the first group of bouncing belt conveyors, making the first group The aggregate mixture that is not sorted by the bounce belt conveyor is sorted out. The aggregate mixture of the two groups of bouncing belt conveyors passes through the second magnetic separator 11-2 to separate the iron in the aggregate to obtain relatively pure aggregate. The second magnetic separator 11-2 is installed on the conveyor belt conveyor for aggregate.

The fine sieve screen 9 sieves into the first-level bounce belt conveyor 14, which is composed of a set of bounce belt conveyors, and the small aggregate rolls down to the first-level bounce belt under the action of a large inclination angle and bounce. Belt conveyor 14 bottoms are sorted out. These small aggregates are sorted out of iron by the second magnetic separator 11-2 to obtain relatively pure aggregates.

The upper sorting objects of the two-stage bouncing belt conveyor 13 and the first-stage bouncing belt conveyor 14 are primary combustibles, which contain a small amount of aggregate. Due to the long-term underground landfill, they are mixed with humus and the combustibles The surface is stained with a layer of humus; use two-stage bouncing belt conveyor 13 and one-stage bouncing belt conveyor 14 instead of winnowing, winnowing due to the high wind pressure, there will be airflow leakage, making its accessories dust and some small pieces of plastic Blown out, using two-stage bouncing belt conveyor 13 and one-stage bouncing belt conveyor 14 instead of wind selection has avoided the occurrence of such things. Density aggregates are sorted out, and the content of lightweight materials in the sorted aggregates is lower than that of winnowing, so that the aggregates can be used as resources.

The bulk combustibles and primary combustibles are processed step by step to obtain relatively pure humus, iron, stainless steel, non-ferrous metals, aggregates and small combustibles;

Turn small pieces of combustibles into fuel rods;

Specifically, the cascade recycling of products includes: sending the primary combustibles sorted out from the screening process into the first relaxation screen 15-1, vibrating and sieving the surface soil of the primary combustibles, and sieving to obtain Pure humus and pure combustibles;

The bulk combustibles sorted out from the screening process and the relatively pure combustibles screened out from the first relaxation screen 15-1 are sent to the crusher 16 for crushing to obtain small pieces of broken combustibles;

The small pieces of crushed material are sent to the third magnetic separator 11-3, the second eddy current separator 12-2, the second relaxation screen 15-2, and the second baffle wind separator 10-2 in turn, and the small pieces are broken Separation of iron, stainless steel and non-ferrous metals, relatively pure humus, and aggregates in sequence to obtain small pieces of combustibles;

Small pieces of combustibles are sent into the RDF forming compartment 17 to make RDF fuel rods.

In the actual operation process, the primary combustibles selected by the two-stage bouncing belt conveyor 13 and the first-stage bouncing belt conveyor 14 and the primary combustibles selected by the first deflection winnowing machine 10-1 all enter the first relaxation screen 15 In -1, the soil on the surface of the primary combustibles is shaken off and screened. The sieve surface of the first relaxation sieve 15-1 vibrates in a wave shape, causing the primary combustibles to move up and down, and rub against each other, so that the humus on the surface partly falls off. The sieve hole of the first relaxation sieve 15-1 is φ8mm, and the sieve out of the sieve is relatively pure humus.

The primary combustibles from which part of the humus has been removed are relatively pure combustibles, and both the relatively pure combustibles and large pieces of combustibles enter the crusher 16 for crushing, and the soil attached to the surface of the combustibles is separated from the combustibles during the crushing process. , while breaking a small amount of aggregate and metal in the combustibles into small pieces. The broken combustibles are separated into iron by the third magnetic separator 11-3, and the iron-separated garbage enters the second eddy current separator 12-2 to separate stainless steel and non-ferrous metals, and the remaining garbage enters the second Among the two relaxation sieves 15-2, the second relaxation sieve 15-2 has a sieve hole of φ8mm, sorts out the humus that has been polished on the surface of the combustibles after crushing, and obtains relatively pure humus. After removing the humus The combustibles enter the second baffle winnowing machine 10-2, the small combustibles are selected by air, the remaining garbage is aggregate, and the small combustibles enter the RDF forming compartment 17 to make RDF fuel rods;

The small pieces of combustibles selected by the second baffle air separator 10-2 are the products of light matter purification. The fan of the second baffle air separator 10-2 uses a frequency conversion speed regulating motor, which can adjust the air pressure to make the density high. The small pieces of aggregate are not sucked away by the wind; the first relaxation sieve 15-1 and the second relaxation sieve 15-2 sort the humus soil attached to the surface of light materials, so that the calorific value of light combustible materials increases .

The purified humus soil can be used for landscaping as nutrient soil after removing non-degradable plastics and other light substances. The aggregates sorted by bouncing belt conveyor, manual sorting and baffle air sorting machine are relatively pure and can be used as roadbed stones and building materials.

Small pieces of combustibles can be made into SRF as a substitute for cement kiln fuel in the cement industry, and can also be made into RDF as a fuel substitute for the steel industry, cement kiln fuel, thermal power generation fuel and clean heating energy.

The present invention also provides a stale garbage screening and product cascade recycling system, which is applied to the above stale garbage screening and product cascade resource recycling method, and the system includes a screening system and a product cascade resource recycling system;

The screening system includes: bulk material sorting 6, manual sorting 7, coarse screening pan screening 8, fine screening pan screening 9, two-stage bouncing belt conveyor 13, one-stage bouncing belt conveyor 14, first deflection wind Separator 10-1, first magnetic separator 11-1, second magnetic separator 11-2 and first eddy current separator 12-1;

Wherein, the bulk object outlet of the bulk object sorting 6 is connected with the manual sorting 7, and the small object outlet of the bulk object sorting 6 is connected with the entrance of the coarse screening disc screen 8;

It can be understood that bulk sorting 6 is installed at the outlet of plate conveyor 5; the bulks selected by bulk sorting 6 are transported by belt conveyor, Manual sorting is installed on both sides with 7 points to select large pieces of combustibles;

The undersize outlet of the coarse screening tray sieve 8 is connected with the inlet of the fine screening tray sieve 9, and the undersize outlet of the fine screening tray selection screen 9 is connected with the inlet of the first baffle wind separator 10-1, The outlet of the first baffle air separator 10-1 is connected to the inlet of the first magnetic separator 11-1, and the outlet of the first magnetic separator 11-1 is connected to the inlet of the first eddy current separator 12-1;

The oversize outlet of the coarse screening disc screen 8 is connected to the entrance of the two-stage bouncing belt conveyor 13, and the lower sorting outlet of the two-stage bouncing belt conveyor 13 is connected to the entrance of the second magnetic separator 11-2;

The oversize outlet of the fine screening disc screen 9 links to each other with the entrance of the first-level bouncing belt conveyor 14, and the lower sorting outlet of the first-level bounce belt conveyor 14 links to each other with the entrance of the second magnetic separator 11-2;

The product cascade recycling system includes: the first relaxation screen 15-1, the crusher 16, the third magnetic separator 11-3, the second eddy current separator 12-2, the second relaxation screen 15-2, the second folding Flow air separator 10-2 and RDF molding compartment 17;

Wherein, the upper sorting object outlet of the two-stage bouncing belt conveyor 13 and the upper sorting object outlet of the first-level bouncing belt conveyor 14 are all connected to the entrance of the first relaxation screen 15-1;

The oversize outlet of the first relaxation screen 15-1 is connected with the inlet of the crusher 16, and the manual sorting 7 is connected with the inlet 16 of the crusher;

The outlet of crusher 16 links to each other with the entrance of the 3rd magnetic separator 11-3, and the outlet of the 3rd magnetic separator 11-3 links to each other with the entrance of the second eddy current separator 12-2, and the second eddy current separator The outlet of 12-2 links to each other with the inlet of the second relaxation screen 15-2;

The oversize outlet of the second relaxation screen 15-2 is connected to the inlet of the second baffle air separator 10-2, and the outlet of the second baffle air separator 10-2 is connected to the RDF forming chamber 17.

Further, the materials between each equipment are connected by conveyors such as belt conveyors and slat conveyors;

Preferably, bulk sorting 6 and manual sorting 7, manual sorting 7 and crusher 16, coarse screening pan screening 8 and fine screening pan screening 9, fine screening pan screening 9 and first Baffle wind separator 10-1, first baffle wind separator 10-1 and first magnetic separator 11-1, first magnetic separator 11-1 and first eddy current separator 12-1, rough screening Disk selection screen 8 and two-stage bouncing belt conveyor 13, two-stage bouncing belt conveyor 13 and second magnetic separator 11-2, fine screening disk selection screen 9 and one-stage bouncing belt conveyor 14, one-stage bouncing belt conveyor 14 and The second magnetic separator 11-2, the first baffle wind separator 10-1 and the first relaxation screen 15-1, the first relaxation screen 15-1 and the crusher 16, the crusher 16 and the third magnetic separator 11- 3. The third magnetic separator 11-3 and the second eddy current separator 12-2, the second eddy current separator 12-2 and the second relaxation sieve 15-2, the second relaxation sieve 15-2 and the second relaxation sieve The second deflection air separator 10-2, the second deflection air separator 10-2 and the RDF forming compartment 17 are connected by an airtight belt conveyor.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (10)

1. The method for screening the stale garbage and recycling the product in a cascade way is characterized by comprising the following steps of:

pretreating the stale garbage stack to obtain a garbage stack with low water and low harmful gas;

transporting the garbage stack to a garbage disposal site by adopting a garbage transport vehicle, and carrying out material refining treatment on the garbage stack;

screening the garbage after refining to obtain massive combustible substances, primary combustible substances, aggregate, iron, stainless steel, nonferrous metals and purer humus soil;

carrying out product cascade recycling treatment on the large combustible matters and the primary combustible matters to obtain purer humus soil, iron, stainless steel, nonferrous metals, aggregate and small combustible matters;

the small combustible blocks are made into fuel rods.

2. The method for stale refuse screening and product cascade recycling according to claim 1, characterized in that the pretreatment comprises:

aeration equipment is adopted to perform aeration and air extraction simultaneously in the mature garbage stack body, so that gas forms internal circulation in the mature garbage stack body, the anaerobic reaction environment in the garbage stack body is changed into an aerobic reaction environment, the generation of harmful gas is blocked, and meanwhile, the harmful gas and water vapor generated in the garbage stack body are brought out.

3. The method of stale refuse screening and product cascade recycling according to claim 2, wherein the pre-treatment further comprises:

purifying the gas pumped out by the aeration equipment by adopting a gas purifying system, and discharging the purified gas.

4. The method for sizing stale refuse and product step recycling according to claim 1, characterized in that the refining treatment comprises:

the garbage truck directly pours garbage into the bin of the step feeder, and the garbage passes through the material homogenizing device at the outlet of the step feeder, so that the garbage is uniformly fed, and the garbage is uniformly conveyed onto the plate conveyor.

5. The method for stale refuse screening and product cascade recycling according to claim 1, wherein the screening process comprises:

sorting the garbage from the outlet of the plate conveyor to separate large objects with the particle size larger than 350 mm;

and manually sorting the separated large blocks to obtain aggregate, wherein the rest large blocks are large blocks of combustible materials.

6. The method for stale refuse screening and product cascade recycling according to claim 5, wherein the screening process further comprises:

delivering the garbage separated from the large blocks into a coarse screening disc screening sieve for primary separation;

feeding the undersize materials screened by the coarse screening disc screening sieve into the fine screening disc screening sieve to carry out secondary screening;

the undersize materials screened by the fine screening disc are humus soil, the humus soil is sequentially sent into a first refraction winnowing machine, a first magnetic separator and a first eddy current separator, primary combustible materials, iron, stainless steel and nonferrous metals are sequentially separated from the humus soil, and purer humus soil is obtained;

the oversize materials screened by the coarse screening disc are sent to a two-stage bouncing belt conveyor for separation, light primary combustible materials and heavy aggregate mixtures are separated, and the separated aggregate mixtures are sent to a second magnetic separator for separation of iron and aggregate;

and (3) conveying the oversize materials screened by the fine screening disc to a first-stage bouncing belt conveyor for sorting, sorting out light primary combustible materials and heavy aggregate mixtures, conveying the sorted aggregate mixtures to a second magnetic separator, and sorting out iron and aggregate.

7. The method for sorting and recycling product steps according to claim 6, wherein the two-stage bouncing belt conveyor is formed by connecting two groups of bouncing belt conveyors in series;

the oversize materials of the coarse screening disc screening enter a first group of bouncing belt conveyors firstly, and heavy aggregate mixtures are separated from light materials;

the light matters continue to enter the second group of bouncing belt conveyors, and the aggregate mixture which is not separated is subjected to bouncing separation again;

the bouncing amplitude of the second group of bouncing belt conveyors is large relative to the bouncing amplitude of the first group of bouncing belt conveyors.

8. The method for sizing stale refuse and product step recycling according to claim 7, wherein the product step recycling process comprises:

and (3) feeding the primary combustible matters separated from the screening treatment into a first relaxation screen, vibrating and falling off and screening the surface soil of the primary combustible matters, and screening to obtain purer humus soil and purer combustible matters.

9. The method for sizing stale refuse and product step recycling according to claim 8, wherein the product step recycling process further comprises:

feeding the large combustible matters separated from the screening treatment and the purer combustible matters screened from the first relaxation screen into a crusher for crushing to obtain small crushed matters;

sequentially feeding the small crushed materials into a third magnetic separator, a second eddy current separator, a second relaxation sieve and a second refraction winnowing machine, and sequentially separating iron, stainless steel, nonferrous metals, purer humus soil and aggregate from the small crushed materials to obtain small combustible materials;

the small combustible blocks are sent into an RDF forming box to manufacture RDF fuel rods.

10. A stale refuse screening and product cascade recycling system, characterized in that the system is applied to the stale refuse screening and product cascade recycling method of any one of claims 1-9, and the system comprises a screening system and a product cascade recycling system;

the screening system includes: bulk sorting, manual sorting, coarse screening disc screening, fine screening disc screening, two-stage bouncing belt conveyor, one-stage bouncing belt conveyor, first refraction winnowing machine, first magnetic separator, second magnetic separator and first eddy current separator;

wherein, the bulk outlet of the bulk sorting is connected with the manual sorting, and the small bulk outlet of the bulk sorting is connected with the inlet of the coarse screening disc sorting screen;

the undersize outlet of the coarse screening disc screening sieve is connected with the inlet of the fine screening disc screening sieve, the undersize outlet of the fine screening disc screening sieve is connected with the inlet of the first refraction winnowing machine, the outlet of the first refraction winnowing machine is connected with the inlet of the first magnetic separator, and the outlet of the first magnetic separator is connected with the inlet of the first eddy current separator;

the oversize product outlet of the coarse screening disc screening sieve is connected with the inlet of the two-stage bouncing belt conveyor, and the lower sorted product outlet of the two-stage bouncing belt conveyor is connected with the inlet of the second magnetic separator;

the screen material outlet of the fine screening disc screening screen is connected with the inlet of the first-stage bouncing belt conveyor, and the lower sorting material outlet of the first-stage bouncing belt conveyor is connected with the inlet of the second magnetic separator;

the product cascade recycling system comprises: the device comprises a first relaxation sieve, a crusher, a third magnetic separator, a second eddy current separator, a second relaxation sieve, a second refraction winnowing machine and an RDF forming carriage;

wherein, the upper sorted matter outlet of the two-stage bouncing belt conveyor and the upper sorted matter outlet of the one-stage bouncing belt conveyor are connected with the inlet of the first relaxation sieve;

the oversize product outlet of the first relaxation sieve is connected with the inlet of the crusher, and the manual sorting is connected with the inlet of the crusher;

the outlet of the crusher is connected with the inlet of the third magnetic separator, the outlet of the third magnetic separator is connected with the inlet of the second eddy current separator, and the outlet of the second eddy current separator is connected with the inlet of the second relaxation sieve;

and an oversize product outlet of the second relaxation sieve is connected with an inlet of the second refraction winnowing machine, and an outlet of the second refraction winnowing machine is connected with the RDF forming compartment.