A drying treatment method and device for the feeding section of a garbage screening line

Abstract

The present invention provides a drying treatment method and device for the feeding section of a garbage screening line, comprising: a main body structure, a feeding section, and a drying bin connected in sequence; the main body structure includes a chain conveyor, support legs, cross braces, and anchor bolts; the feeding section includes a vibrating bar screen, a feeding hopper, and a large material window; the drying bin includes a storage bin, a discharge hopper, a material pushing rod, a drying unit, and a ventilation unit; the feeding hopper is fixedly connected to the storage bin and is arranged above the chain conveyor, the discharge hopper is fixedly connected to the storage bin and is arranged behind the chain conveyor, the material pushing rod is arranged on both sides of the storage bin along the length direction of the storage bin, the drying unit includes a heating steam pipeline and a condensate discharge pipeline; the ventilation unit includes an air inlet pipeline, an air outlet pipeline, a wind power device, and an exhaust pipeline, the air inlet pipeline and the air outlet pipeline are respectively located on both sides of the top of the storage bin, the wind power device is connected to the air inlet pipeline, and the exhaust pipeline is connected to the air outlet pipeline. The present invention ensures the processing capacity and screening quality of the garbage screening line.

Description

Technical Field

[0001] The invention relates to the technical field of garbage screening and processing, and in particular to a drying processing method and device for a feeding section of a garbage screening line. Background Art

[0002] In recent years, with the continuous implementation and promotion of the "Zero Waste City" policy, my country's existing landfills are facing governance, and waste screening technology is an important means to thoroughly manage landfills. Screening technology can not only completely eliminate the pollution of landfills from the source, but also utilize the screening products as resources, while releasing the precious land resources occupied by landfills, which has huge economic, environmental and social benefits.

[0003] Since the domestic garbage screening industry is in its infancy, overall, the technology is relatively backward, the investment in research and development is insufficient, and the development and improvement of equipment cannot meet the characteristics of stale garbage. Due to the high moisture content of stale garbage, the screening effect is poor, the screening capacity does not meet the standard, and the core equipment in the screening line often fails. For example, the screen plate of the drum screen is blocked, and the cleaning work is complicated and inefficient; for example, the return air structure of the air separator is blocked, resulting in poor sorting effect and small return air volume. Therefore, the moisture content of garbage is one of the key factors affecting the screening effect. At present, the commonly used solution to the problem of high moisture content of garbage is engineering measures, that is, to reduce the moisture content of garbage by pre-screening drying pretreatment, which often leads to the embarrassing situation that the screening system is not loaded in time and there is no material to load.

[0004] In view of this, the present invention proposes a drying treatment method and device for a feeding section of a garbage screening line. Summary of the invention

[0005] The invention provides a drying treatment method and device for a feeding section of a garbage screening line, so as to solve the technical problem in the prior art that the garbage cannot be screened, leveled and dried simultaneously in the screening section.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A drying treatment device for a feeding section of a garbage screening line, comprising:

[0008] The main structure, feeding section and drying bin are connected in sequence;

[0009] The main structure includes chain conveyor, outriggers, cross braces and anchor bolts;

[0010] The feeding section includes a vibrating bar screen, a feeding hopper and a large material window. The vibrating bar screen is arranged inside the hopper and is composed of a frame beam, multi-layer bars, an excitation unit and other parts.

[0011] The drying bin includes a silo, a discharge hopper, a material lever, a drying unit, and a ventilation unit.

[0012] The inlet / outlet hopper is fixedly connected to the silo and is arranged above the chain conveyor, such that at least a part of the chain conveyor is located inside the hopper and the silo;

[0013] The material pushing rods are arranged on both sides of the silo along the length direction of the silo, are inclined, and the arrangement height gradually decreases along the length direction of the silo;

[0014] The drying unit includes a heating steam pipeline and a condensation discharge pipeline. The heating steam pipeline is arranged on the top and both sides of the silo, and the pipeline arrangement density is determined according to the material characteristics. The heating steam pipeline is connected to the condensation discharge pipeline located outside the silo;

[0015] The air change unit includes an air inlet pipeline, an air outlet pipeline, a wind power device, and an exhaust pipeline. The air inlet pipeline and the air outlet pipeline are respectively located on both sides of the top of the silo. The wind power device is connected to the air inlet pipeline, and the exhaust pipeline is connected to the air outlet pipeline.

[0016] Optionally, the hopper has a ring beam, and there are several H-shaped steels vertically supported on each of the left and right sides.

[0017] Optionally, the vibrating bar screen is arranged in layers by a frame beam and bars, with a total of 3 to 5 layers. The height difference between each layer is 10 to 20 cm, and the bar spacing of each layer is 15 - 30 cm.

[0018] Optionally, the base of the chain conveyor is selected with a chain plate width ≥ 2 m, a net length ≥ 15 m, the overall angle of the chain conveyor is controlled within 7 - 10°, and the column foot height needs to be 0.5 m - 2.0 m.

[0019] Optionally, the silo is made of two layers of materials. The inner layer is made of steel, and the outer layer is provided with an aerogel felt heat insulation layer with a thickness of 40 - 100 mm outside the steel. The height of the silo is 1.0 m - 1.5 m, the width is 1.8 - 2.2 m, and the length ≥ 14 m.

[0020] Optionally, the material pushing rod is a flat detachable solid rubber tube, with a single rod length of 0.8 - 1.0 m, a width of 5 - 10 cm, a thickness of 2 - 4 cm, an arrangement spacing of 0.8 - 1.0 m, and the final arrangement height of the material pushing rod is stable at 0.15 - 0.3 m.

[0021] Optionally, the heating steam pipeline is arranged on the top and side walls of the silo. The spacing of the heating steam pipelines arranged on the top of the silo is ≤ 0.5 m, and heating steam pipelines are arranged on both side walls of the silo. The pipelines are arranged in an S shape, and the spacing is controlled within 0.1 - 0.3 m. The heating steam pipeline

[0022] Optionally, the air inlet pipeline and the air outlet pipeline each have two air inlets and two air outlets. The air inlets and air outlets are respectively located at both ends of the top of the silo (in the length direction), with a spacing of 8 - 10 m, and the spacing between the two air inlets / air outlets is approximately 1.2 - 1.6 m.

[0023] Furthermore, a method for screening and drying garbage using the above device is provided, such that the residence time of the garbage in the silo during transportation is 4 - 8 min; the wind speed of the wind power equipment in the air exchange unit is controlled to be maintained at 5 - 15 m / s, and the air exchange efficiency is 10 - 30 times / min; the heat energy of the drying unit comes from the waste heat steam generated by biogas incineration, and the condensate discharge pipeline is used to collect condensate water for reuse in the waste heat utilization boiler.

[0024] The beneficial effects brought by the technical solution provided by the present invention at least include:

[0025] By providing a drying treatment method and device for the chain conveyor at the feeding section of the garbage screening line, on the basis of the conventional function of garbage transportation, the large - material filtration and bulk material buffering of the garbage material are realized through the setting of the vibrating bar screen, preventing the damage of the chain conveyor; through the symmetrically arranged and gradually decreasing along the length of the silo and finally maintaining a stable height of the material - distributing rods, the material can be effectively dispersed and evenly distributed, and the material - equalizing method is simple and easy to implement; since the even distribution of the material is also beneficial to the rapid drying of the material, through the combined use of material distribution, drying and air exchange, the drying of the material can be efficiently realized. Through the coordination among various systems of the present invention, the processing capacity and screening quality of the garbage screening line are effectively guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following - described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a schematic diagram of the drying treatment device for the feeding section of the garbage screening line of the present invention;

[0028] Figure 2 It is a schematic diagram of the vibrating bar screen of the present invention;

[0029] Figure 3 It is a sectional view of the material - distributing rod of the present invention;

[0030] Among them, 1 - leg, 2 - cross brace, 3 - anchor bolt, 4 - chain conveyor, 5 - vibrating bar screen, 5 - 1 - frame beam, 5 - 2 - bar, 5 - 3 - excitation unit, 6 - feed hopper, 6 - 1 - large - material window, 6 - 2 - H - shaped steel support, 7 - silo, 7 - 1 - discharge hopper, 7 - 2 - aerogel felt insulation layer, 8 - feeding rod, 9 - heating steam pipeline, 10 - inlet air pipeline, 11 - outlet air pipeline. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] As Figure 1 shown, the present invention provides a drying treatment device for the feeding section of a garbage screening line, including a main structure, a feeding section, and a drying bin.

[0033] The main structure includes a chain conveyor 4, legs 1, cross braces 2, and anchor bolts 3;

[0034] The feeding section includes a vibrating bar screen 5, a feed hopper 6, and a large - material window 6 - 1. The vibrating bar screen 5 is arranged inside the feed hopper 6.

[0035] The feed hopper 6 serves as the frame of the feeding port. The main material is Q235 steel plate with a thickness of 6 - 8 mm, and it is designed with a circle of cross - beams. There are two vertical H - shaped steel supports on each of the left and right sides to ensure the structural safety of the vibrating bar screen.

[0036] The vibrating bar screen 5 is composed of a frame beam 5 - 1 and bars 5 - 2 arranged in layers, with a total of 3 - 5 layers. The height difference between each layer is 10 - 20 cm, and the bar spacing in each layer is 15 - 30 cm. By setting the height difference and spacing of the multi - layer bars, large - block materials with a diameter greater than 20 - 30 cm can be filtered out, and at the same time, the materials can be preliminarily dispersed to achieve uniform feeding. The spacing of each bar is set to 15 - 30 cm, mainly to filter out garbage materials (such as stones, bricks, wood products, quilts, etc.) with a particle size larger than the bar spacing, and the garbage materials with a particle size smaller than the bar spacing are evenly sent onto the chain conveyor under the action of gravity. The vibrating bar screen 5 also has an excitation unit 5 - 3, whose function is to apply an eccentric force to make the frame beam of the bar screen vibrate, and finally cause the bars to vibrate, accelerating the passing of materials. The structure of the vibrating bar screen 5 is as Figure 2 shown.

[0037] The base of the chain conveyor of the drying bin uses a traditional chain conveyor, which is mainly composed of components such as a motor - reducer, a transmission shaft, a drum, a tensioning device, a chain plate (or corrugated plate), a sprocket, a chain, and bearings. The width of the chain plate selected for the chain conveyor base is ≥2 m, the net length is ≥15 m, the overall angle of the chain conveyor is controlled at 7 - 10°, and the column - foot height needs to be between 0.5 m and 2.0 m.

[0038] The chain plate machine is driven by a high-strength chain, with a large load-bearing capacity and strong impact resistance, avoiding the garbage materials from being stuck and stopped by the feeding rod of the drying bin; the chain plate / corrugated plate is made of NM360 wear-resistant plate material, and the corrugated shape is formed by one-time stamping, with a thickness of ≥6mm and a side plate thickness of ≥10mm. The upper mouth where the corrugated plates overlap is on the discharging direction side of the plate conveyor, and the discharging direction is on the side of the driving sprocket, ensuring that there is no material leakage and scattering during the transportation of the garbage materials, and at the same time ensuring the sealing performance of the chain plate, providing guarantee for the sealing performance of the drying bin and avoiding excessive heat loss in the bin; the overall chain plate machine adopts a frame structure, with guide plates on both sides. The frame is made of national standard Q345B profile steel, with sufficient strength to ensure the stability of the chain plate machine and the drying bin; the easily corroded and worn parts such as the guide plate / guide chute are made of high anti-corrosion and wear-resistant materials, and are also suitable for the high-temperature and high-humidity working conditions of the drying bin; the chain plate machine adopts a motor reducer as the transmission structure, with a frequency conversion speed regulation function, so that the residence time of the materials in the bin is about 4-8 minutes. It can also adjust the running speed of the chain plate according to the actual operating conditions in the drying bin, control the passing time of the materials, and ensure the drying effect of the materials.

[0039] The drying bin includes a material bin 7, a feeding rod 8, a drying unit, and a ventilation unit.

[0040] The material bin 7 is the main frame structure of the drying bin. The main body material adopts two layers of materials. The inner layer is made of wear-resistant steel plate with a thickness of ≥6mm, ensuring a certain rigidity and strength as the main structure; a layer of aerogel felt heat insulation layer is set outside the steel, ensuring that the inside of the drying bin is in a constant temperature state and avoiding energy waste. The height of the material bin is 1.0m - 1.5m, the width is 1.8 - 2.2m, and the length is ≥14m.

[0041] The main function of the feeding rod 8 is to disperse and even the materials, prevent the materials from piling up locally, make the material thickness gradually uniform, and reduce it below the designed thickness. The feeding rod is arranged along the length direction of the material bin of the chain plate machine, with a layout spacing of 0.8 - 1.0m, a single rod length of 0.8 - 1.0m, and a symmetrical layout on both sides of the material bin; to prevent the materials from being stuck on the feeding rod, a gradient height design is adopted for the layout of the feeding rod, that is, the height of the feeding rod gradually decreases in the length direction, and finally the height of the feeding rod is stable within the range of 0.15 - 0.3m. The feeding rod adopts a detachable solid rubber tube, which is flat, with a width of 5 - 10cm and a thickness of 2 - 4cm, and is inclined, with a certain elasticity and toughness, thus avoiding the feeding rod passing through the middle of the garbage materials and failing to play the role of dispersing and evening the materials. The cross-section of the feeding rod is as Figure 3 shown.

[0042] The drying unit mainly consists of a heating steam pipeline 9, a condensate discharge pipeline, etc. The heating steam pipeline 9 is arranged in the silo and is connected to the condensate discharge pipeline located outside the silo. The function of the drying unit is to increase the temperature in the silo through the heating steam pipeline so that the temperature in the silo reaches above 60°C. Its heat energy comes from the waste heat steam generated by biogas incineration. The pipeline uses 20# seamless steel pipe with an outer diameter of 38 - 89 mm; the condensate discharge pipeline is mainly used to collect condensate water for continued reuse by the preheating utilization boiler. The heating steam pipeline 9 is arranged on the top and side walls of the silo. The spacing of the heating steam pipelines arranged on the top of the silo is ≤0.5 m, and a circle of heating steam pipelines is arranged on each of the two side walls of the silo.

[0043] The air change unit consists of an air inlet pipeline 10, an air outlet pipeline 11, a wind power device, a discharge pipeline, etc. The function of the air change unit is to form an air circulation in the silo to accelerate the evaporation of moisture on the surface of the garbage material, so as to achieve the purpose of garbage drying. The air inlet and outlet are respectively arranged on both sides of the top of the silo. The air inlet pipeline and the air outlet pipeline respectively have two air inlets and two air outlets. The air inlets and air outlets are respectively located at both ends of the top of the silo (in the length direction), with a spacing of 8 - 10 m, and the spacing between the two air inlets / air outlets is about 1.2 - 1.6 m. The wind power device provides the source of forced convection wind for the air in the silo, generally using a centrifugal blower, with the wind speed maintained at 5 - 15 m / s, and the air change efficiency is 10 - 30 times / min. The air volume needs to be adjusted according to the actual operating conditions. Due to the evaporation of moisture on the surface of the garbage material, the outlet air will contain a large amount of moisture and also a large amount of dust. Connect the exhaust pipeline to the outlet pipeline and introduce it into the workshop gas collection pipeline, and directly introduce the polluted outlet air into the gas purification system for treatment.

[0044] The usage method of the device of the present invention is as follows: Garbage enters the vibrating bar screen through the feeding port for screening. The garbage material with a particle size smaller than the bar spacing is evenly sent onto the chain conveyor under the action of gravity. The buffered garbage falls onto the chain conveyor and is transported towards the silo outlet on the chain conveyor. During the transportation process, the material spreading rod scatters the material to reduce the material thickness to below the designed thickness. Turn on the drying unit to raise the temperature in the silo to above 60°C, and at the same time turn on the fan to provide forced air convection inside the silo through the air inlet pipeline and the air outlet pipeline, and the drawn air is sent to the purification system for treatment.

[0045] As mentioned above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the said claims.

Claims

1. A drying treatment device for the feeding section of a garbage screening line, characterized in that, it includes: a main structure, a feeding section, and a drying bin connected in sequence; the main structure includes a chain conveyor, support legs, cross braces, and anchor bolts; the feeding section includes a vibrating bar screen, a feeding hopper, a large material window, and H-shaped steel supports. The vibrating bar screen is arranged inside the feeding hopper and includes a frame beam, multiple layers of bars, and an exciting unit. The vibrating bar screen is arranged with multiple layers of the frame beam and bars, with a total of 3 - 5 layers, a height difference of 10 - 20 cm between each layer, and a bar spacing of 15 - 30 cm for each layer. Garbage materials with a particle size larger than the bar spacing are filtered out, and garbage materials with a particle size smaller than the bar spacing are evenly fed onto the chain conveyor under the action of gravity; the drying bin includes a material bin, a discharge hopper, a material stirring rod, a drying unit, and a ventilation unit; the feeding hopper, the discharge hopper, and the material bin are fixedly connected and arranged above the chain conveyor, surrounding the chain conveyor to form a closed space; the material stirring rods are arranged on both sides of the material bin along the length direction of the material bin, arranged obliquely, and the arrangement height gradually decreases along the length direction of the material bin; the material stirring rods are flat detachable solid rubber tubes, arranged obliquely, with a single rod length of 0.8 - 1.0 m, a width of 5 - 10 cm, a thickness of 2 - 4 cm, an arrangement spacing of 0.8 - 1.0 m, an initial height of the material stirring rod from the top of the bin of 0.2 - 0.4 m, and a final arrangement height stabilized at 0.15 - 0.3 m; the drying unit includes a heating steam pipeline and a condensate discharge pipeline. The heating steam pipeline is arranged on the top and both sides of the material bin, and the pipeline arrangement density is determined according to the material characteristics and is connected to the condensate discharge pipeline located outside the material bin; the ventilation unit includes an air inlet pipeline, an air outlet pipeline, a wind power device, and an exhaust pipeline. The air inlet pipeline and the air outlet pipeline are respectively located on both sides of the top of the material bin. The wind power device is connected to the air inlet pipeline, and the exhaust pipeline is connected to the air outlet pipeline.

2. The device according to claim 1, characterized in that, the hopper has a ring beam, and each of the left and right sides has H-shaped steel for vertical support.

3. The device according to claim 1, characterized in that, the base of the chain conveyor is selected with a chain width ≥ 2 m, a net length ≥ 15 m, the overall angle of the chain conveyor is controlled at 7 - 10°, and the column foot height needs to be 0.5 m - 2.0 m.

4. The device according to claim 1, characterized in that, the material bin is made of two layers of materials, with steel used inside and a layer of aerogel felt heat insulation layer arranged outside the steel; the height of the material bin is 1.0 m - 1.5 m, the width is 1.8 - 2.2 m, and the length ≥ 14 m.

5. The device according to claim 1, characterized in that, the heating steam pipeline is arranged on the top and side walls of the material bin. The spacing of the heating steam pipelines arranged on the top of the material bin ≤ 0.5 m, and heating steam pipelines are arranged on both side walls of the material bin. The pipelines are arranged in an S shape, and the spacing is controlled at 0.1 - 0.3 m.

6. The device according to claim 1, characterized in that, the air inlet pipeline and the air outlet pipeline respectively have two air inlets and two air outlets. The air inlets and air outlets are respectively located at both ends of the top of the material bin along the length direction, with a spacing of 8 - 10 m, and the spacing between the two air inlets / air outlets is about 1.2 - 1.6 m.

7. A drying treatment method for the feeding section of a garbage screening line, characterized in that, the device described in any one of claims 1-6 is adopted, so that the residence time of the garbage in the silo during transportation is 4-8 minutes; the wind speed of the wind power equipment in the air change unit is controlled to be maintained at 5-15 m / s, and the air change efficiency is 10-30 times / minute; the heat energy of the drying unit comes from the waste heat steam generated by biogas incineration, and the condensate discharge pipeline is used to collect the condensate water for continuous reuse by the waste heat utilization boiler.

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