Paper sorting and recycling system in domestic waste

Abstract

The present invention discloses a system for sorting and regenerating paper from domestic waste, which includes a crushing unit, a drum screen, an adsorption unit, a wind selection unit, a hydraulic pulper, a sand remover, a bouncing screen, an inclined screen, a pulp concentration adjustment unit, a paper press, a dryer, and a sewage treatment unit. The system for sorting and regenerating paper from domestic waste of the present invention can separate the paper from domestic waste more thoroughly, so that the purity of the pulp obtained subsequently is purer, thereby improving the quality of paper product recycling. In addition, the present invention converts the paper in domestic waste into fibers and mixes it in a fluidized layer, then removes impurities mixed in the fluidized layer, and finally obtains finished paper products by paper pressing and drying. The entire production process has good continuity and can improve the efficiency of paper product recycling.

Description

Technical Field

[0001] The invention relates to the technical field of domestic waste treatment, and in particular to a system for sorting and regenerating paper in domestic waste. Background Art

[0002] Due to the rapid development of the national economy and the dense population in cities, a large amount of domestic waste has appeared. Domestic waste generally contains paper products, such as waste paper and paper packaging boxes generated during printing. However, since my country generally does not classify domestic waste, and the way of domestic waste treatment in my country is generally landfill and incineration, the paper products in domestic waste will eventually be difficult to recycle. From the perspective of resource recycling, this is not in line with the trend of sustainable development.

[0003] Although there are some equipment that can separate paper products from household waste, the purity of the separated paper products is not high enough and they are often mixed with plastics, which reduces the recycling quality of paper products. At present, the separation of paper products from household waste and the recycling of the separated paper products are basically completed in different factories, which lacks production continuity and has a low efficiency in paper product recycling. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a system for sorting and recycling paper in domestic waste, which can improve the quality and efficiency of paper product recycling.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] Paper sorting and recycling system in domestic waste, including:

[0007] A crushing unit, which is suitable for crushing domestic waste;

[0008] A drum screen, which is suitable for screening the material after being crushed by the crushing unit to screen out the oversize and undersize; the oversize cannot pass through the sieve holes of the drum screen, and the undersize can pass through the sieve holes of the drum screen;

[0009] An adsorption unit, which is suitable for negative pressure adsorption sorting of the screened material to sort out plastic fragments, paper fragments and leaves;

[0010] A wind separation unit, which is suitable for wind separation of the material on the screen to separate flake plastics, paper and cloth;

[0011] A hydraulic pulper, which is suitable for hydraulically pulping the materials sorted by the adsorption unit and the materials sorted by the air separation unit to obtain a flowing layer and a floating layer; wherein the flowing layer includes mud, paper fiber, plastic powder, leaf powder and sewage, and the floating layer includes sheet-like plastic and cloth;

[0012] A desander, which is suitable for desanding the fluidized layer to remove the silt in the fluidized layer;

[0013] A bouncing screen is suitable for bouncing and screening the fluidized bed after sand removal, so that paper fibers and sewage in the fluidized bed flow down from the screen holes of the bouncing screen, and plastic and leaf fragments bounce and separate from above the bouncing screen;

[0014] An inclined screen, the inclined screen is located below the spring screen and is suitable for separating paper fibers and sewage flowing down from the screen holes of the spring screen, wherein the sewage flows out from the mesh holes of the inclined screen and the paper fibers slide down along the upper surface of the inclined screen;

[0015] a pulp concentration adjusting unit, which is adapted to collect paper fibers sliding out from the upper surface of the inclined screen and to add clean water to the paper fibers to obtain a predetermined pulp concentration;

[0016] A paper press, which is suitable for pressing pulp to obtain paper sheets and squeeze out sewage;

[0017] A dryer, which is suitable for drying the paper sheets pressed by the paper press to obtain recycled paper;

[0018] The sewage treatment unit is suitable for treating the sewage flowing out of the meshes of the inclined screen and the sewage produced by the paper press to obtain clean water and sludge; wherein the clean water is suitable for supplying the hydraulic pulper and the pulp concentration regulating unit.

[0019] Furthermore, the crushing unit is a double-shaft shredder.

[0020] Furthermore, the diameter of the mesh of the drum screen is 55-60 mm.

[0021] Furthermore, the mesh diameter of the spring screen is 2-3 mm.

[0022] Furthermore, the mesh size of the inclined screen is 60-80 meshes.

[0023] Furthermore, a grid machine is arranged above the hydraulic pulper.

[0024] Furthermore, the air separation unit is a drum air separation screening machine, which includes a screen drum and a driving mechanism for driving the screen drum to rotate. The screen drum is arranged at an angle, and the higher end of the screen drum is the feed end, and the lower end of the screen drum is the discharge end. Sieve holes are arranged on the wall of the middle section of the screen drum. The feed end of the screen drum is also provided with a blowing device, and the blowing device is used to blow out the sheet-like plastic, paper and cloth in the screen drum from the discharge end.

[0025] Furthermore, the adsorption unit is a negative pressure adsorption collector, which includes a turbine high-pressure fan, a circulating air inlet pipe, a jet pipe and a cyclone collector; the upper part of the cyclone collector is a cylindrical body, and the lower part of the cyclone collector is a conical body, the upper end diameter of the conical body is larger than the lower end diameter, the upper end of the conical body is connected to the lower end of the cylindrical body, the upper end of the cylindrical body is provided with a top cover, the top cover is provided with a cylindrical air outlet pipe, the cylindrical air outlet pipe is coaxially arranged with the cylindrical body, the air inlet end of the turbine high-pressure fan is connected with the cylindrical air outlet pipe through the circulating air inlet pipe, the air outlet end of the turbine high-pressure fan is connected with the cylindrical body through the jet pipe, the airflow in the jet pipe is suitable for entering the cylindrical body along the tangential direction of the cylindrical body, and the jet pipe is provided with a negative pressure adsorption port.

[0026] Furthermore, the injection pipe includes an air supply pipe, a Laval nozzle, a mixing pipe and an air blowing pipe; the first end of the air supply pipe is connected to the air outlet end of the turbine high-pressure blower, the second end of the air supply pipe is connected to the Laval nozzle, the diameter of the mixing pipe is larger than the diameter of the air supply pipe, and the mixing pipe is suitable for enclosing the Laval nozzle inside it, the first end of the air blowing pipe is connected to the mixing pipe, a negative pressure adsorption port is opened on the wall of the mixing pipe, and the second end of the air blowing pipe is connected to the cylindrical body.

[0027] Furthermore, a collection cover is provided at the negative pressure adsorption port.

[0028] Compared with the prior art, the beneficial effect of the present invention is that the paper sorting and regeneration system in domestic waste of the present invention can separate the paper in domestic waste more thoroughly, so that the purity of the pulp obtained later is purer, thereby improving the quality of paper product recycling. In addition, the present invention converts the paper in domestic waste into fibers and mixes it in the fluidized layer, then removes the impurities mixed in the fluidized layer, and finally obtains the finished paper product by pressing and drying the paper. The entire production process has good continuity and can improve the efficiency of paper product recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural block diagram of the paper sorting and regeneration system in domestic waste of the present invention;

[0030] Figure 2 It is a schematic diagram of the drum sorting and screening machine in the present invention;

[0031] Figure 3 It is a schematic diagram of the negative pressure adsorption collector in the present invention.

[0032] In the figure: 11, screen drum; 12, blasting equipment; 21, turbine high-pressure fan; 22, circulating air inlet pipe; 3, injection pipe; 31, air supply pipe; 32, Laval nozzle; 33, mixed flow pipe; 34, air blowing pipe; 35, collecting hood; 36, negative pressure adsorption port; 4, cyclone collector; 41, cylindrical barrel; 42, frustum barrel; 5, cylindrical air outlet pipe. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] like Figure 1 As shown, a system for sorting and recycling paper in domestic waste provided by an embodiment of the present invention is shown, which includes a crushing unit, a drum screen, an adsorption unit, a wind selection unit, a hydraulic pulper, a desander, a bouncing screen, an inclined screen, a pulp concentration adjustment unit, a paper press, a dryer and a sewage treatment unit.

[0037] Among them, the crushing unit is suitable for crushing domestic waste, specifically, the crushing unit is a double-shaft shredder. Crushing domestic waste by the crushing unit can facilitate subsequent screening. The drum screen is suitable for screening the materials after being crushed by the crushing unit to screen out the screened materials and the screened materials, wherein the screened materials are materials that cannot pass through the sieve holes of the drum screen, and the screened materials are materials that can pass through the sieve holes of the drum screen. Specifically, the diameter of the sieve holes of the drum screen is 55-60mm. The adsorption unit is suitable for negative pressure adsorption sorting of the screened materials to sort out plastic fragments, shredded paper and leaves. The wind selection unit is suitable for wind power sorting of the screened materials to sort out sheet plastics, paper and cloth. The above-mentioned adsorption unit and wind selection unit can be implemented by existing technologies, and no further description is given here.

[0038] The hydraulic pulper is suitable for hydraulic pulping the materials sorted out by the adsorption unit and the materials sorted out by the sorting unit to obtain a flowing layer and a floating layer; wherein the flowing layer includes silt, paper fiber, plastic fragments, leaf fragments and sewage, and the floating layer includes flaky plastic and cloth. It should be understood that during the transportation or stacking of domestic garbage, sand and soil will inevitably be mixed in it. If it is not removed, it will affect the subsequent regeneration of paper products. Therefore, the present invention uses a desander to remove sand from the flowing layer to remove the silt in the flowing layer. The desander can also be implemented by existing technology, such as the finished pulp desander disclosed in Chinese patent CN202099671U. Preferably, a grid machine is arranged above the hydraulic pulper. The floating layer can be sorted out from the hydraulic pulper by the grid machine. Specifically, the grid machine can adopt a grid decontamination machine disclosed in Chinese patent CN107673422A.

[0039] The bouncing screen is suitable for bouncing and screening the fluidized layer after sand removal, so that the paper fibers and sewage in the fluidized layer flow down from the screen holes of the bouncing screen, and the plastic and leaf fragments bounce and separate from the top of the bouncing screen. In this way, paper is separated from other materials. Specifically, the diameter of the screen hole of the bouncing screen is 2-3mm. The inclined screen is arranged below the bouncing screen, which is suitable for separating the paper fibers and sewage flowing down from the screen holes of the bouncing screen, wherein the sewage flows out from the mesh holes of the inclined screen, and the paper fibers slide down along the upper surface of the inclined screen. The paper and sewage can be initially separated by the action of the inclined screen. Specifically, the mesh holes of the inclined screen are 60-80 meshes. The pulp concentration adjustment unit is suitable for collecting the paper fibers sliding out from the upper surface of the inclined screen, and is suitable for adding clean water to the paper fibers to obtain a predetermined pulp concentration. After the pulp of the predetermined concentration is obtained, the pulp of the predetermined concentration can generally be pumped to the paper press by a fluid pump for pressing to obtain paper sheets and squeeze out the sewage. The dryer is suitable for drying the paper sheets pressed by the paper press to obtain recycled paper.

[0040] The sewage treatment unit is suitable for treating the sewage flowing out of the mesh of the inclined screen and the sewage squeezed out of the paper press to obtain clean water and sludge; the clean water is suitable for supplying the hydraulic pulper and the pulp concentration adjustment unit. Through the sewage treatment unit, water resources can be saved, which is very environmentally friendly.

[0041] As a preferred embodiment, refer to Figure 2 The air separation unit is a drum air separation screening machine, which includes a screen drum 11 and a driving mechanism for driving the screen drum 11 to rotate. The screen drum 11 is arranged obliquely, and the higher end of the screen drum 11 is the feeding end, and the lower end of the screen drum 11 is the discharging end. Sieve holes are arranged on the wall of the middle section of the screen drum 11, and a blowing device 12 is also arranged at the feeding end of the screen drum 11. The blowing device 12 is used to blow out the sheet-like plastic, paper and cloth in the screen drum 11 from the discharging end.

[0042] Preferably, refer to Figure 3 The adsorption unit is a negative pressure adsorption collector, which includes a turbine high pressure fan 21, a circulating air inlet pipe 22, a jet pipe 3 and a cyclone collector 4; the upper part of the cyclone collector 4 is a cylindrical body 41, and the lower part of the cyclone collector 4 is a truncated cone body 42, the upper end diameter of the truncated cone body 42 is larger than the lower end diameter, the upper end of the truncated cone body 42 is connected to the lower end of the cylindrical body 41, and the upper end of the cylindrical body 41 is provided with The top cover is provided with a cylindrical air outlet pipe 5, which is coaxially arranged with the cylindrical body 41. The air inlet end of the turbine high-pressure fan 21 is connected with the cylindrical air outlet pipe 5 through the circulating air inlet pipe 22, and the air outlet end of the turbine high-pressure fan 21 is connected with the cylindrical body 41 through the injection pipe 3. The airflow in the injection pipe 3 is suitable for entering the cylindrical body 41 along the tangential direction of the cylindrical body 41, and a negative pressure adsorption port 36 is opened on the injection pipe 3.

[0043] A negative pressure adsorption port 36 is provided on the injection pipe 3. When the air in the injection pipe 3 flows, negative pressure will be formed at the negative pressure adsorption port 36. In this way, the negative pressure adsorption port 36 can suck the plastic fragments, shredded paper and leaves into the injection pipe 3, and enter the cyclone collector 4 along with the airflow in the injection pipe 3. The principle of the cyclone collector 4 is similar to that of the cyclone dust collector. Therefore, when the light objects sucked into the cyclone collector 4, they will move downward in a spiral along the inner walls of the cylindrical body 41 and the conical body 42, and finally fall out from the lower end of the conical body 42. In this way, the separation and capture of the plastic fragments, shredded paper and leaves are completed. The capture here refers to the separation of the plastic fragments, shredded paper and leaves and their entry into the cyclone collector 4. In addition, in the present application, the air inlet end of the turbine high-pressure fan 21 is connected to the cylindrical air outlet pipe 5 through the circulating air inlet pipe 22, that is, the turbine high-pressure fan generates suction on the inside of the cyclone collector 4, thereby avoiding the pressure increase in the cyclone collector 4 and ensuring the negative pressure adsorption effect at the negative pressure adsorption port 36. In addition, such a connection method forms a circulating airflow between the circulating air inlet pipe 22, the turbine high-pressure fan 21, the injection pipe 3 and the cyclone collector 4, so that when using the same power turbine high-pressure fan 21, there is a greater pressure in the injection pipe 3, which further improves the adsorption effect of the negative pressure adsorption port 36.

[0044] Preferably, the injection pipe 3 includes an air supply pipe 31, a Laval nozzle 32, a mixing pipe 33 and an air blowing pipe 34; the first end of the air supply pipe 31 is connected to the air outlet of the turbine high-pressure blower 21, the second end of the air supply pipe 31 is connected to the Laval nozzle 32, the diameter of the mixing pipe 33 is larger than the diameter of the air supply pipe 31, and the mixing pipe 33 is suitable for enclosing the Laval nozzle 32 inside, the first end of the air blowing pipe 34 is connected to the mixing pipe 33, a negative pressure adsorption port 36 is provided on the wall of the mixing pipe 33, and the second end of the air blowing pipe 34 is connected to the cylindrical body 41. The setting of the Laval nozzle 32 can further increase the flow rate, thereby generating a strong negative pressure around the Laval nozzle 32, so that the negative pressure adsorption port 36 has a better adsorption effect. Specifically, a collection hood 35 is provided at the negative pressure adsorption port 36.

[0045] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A system for sorting and recycling paper from domestic waste, characterized in that: include: A crushing unit, which is suitable for crushing domestic waste; A drum screen, which is suitable for screening the material after being crushed by the crushing unit to screen out the oversize and undersize; the oversize cannot pass through the sieve holes of the drum screen, and the undersize can pass through the sieve holes of the drum screen; The adsorption unit is suitable for performing negative pressure adsorption sorting on the material under the screen to sort out plastic powder, paper shreds and leaves; the wind sorting unit is suitable for performing wind power sorting on the material on the screen to sort out plastic flakes, paper and cloth; A hydraulic pulper, which is suitable for hydraulically pulping the materials sorted by the adsorption unit and the materials sorted by the air separation unit to obtain a fluidized layer and a floating layer; wherein the fluidized layer includes silt, paper fiber, plastic powder, leaf powder and sewage, and the floating layer includes sheet-like plastic and cloth; a desander, which is suitable for desanding the fluidized layer to remove silt in the fluidized layer; A bouncing screen is suitable for bouncing and screening the fluidized bed after sand removal, so that paper fibers and sewage in the fluidized bed flow down from the screen holes of the bouncing screen, and plastic and leaf fragments bounce and separate from above the bouncing screen; an inclined screen is located below the bouncing screen and is suitable for separating paper fibers and sewage flowing down from the screen holes of the bouncing screen, wherein sewage flows out from the mesh holes of the inclined screen and paper fibers slide down along the upper surface of the inclined screen; a pulp concentration adjusting unit is suitable for collecting the pulp from the upper surface of the inclined screen. The invention relates to a paper pulping machine, which is suitable for pressing the paper pulp to obtain paper sheets and squeezing out the sewage; a drying machine, which is suitable for drying the paper sheets pressed by the paper press to obtain recycled paper; a sewage treatment unit, which is suitable for treating the sewage flowing out of the mesh of the inclined screen and the sewage produced by the paper press to obtain clean water and sludge; wherein the clean water is suitable for supplying the hydraulic pulper and the pulp concentration adjusting unit; The crushing unit is a double-shaft shredder; The mesh diameter of the drum screen is 55-60 mm; The mesh diameter of the spring screen is 2-3 mm; The mesh size of the inclined screen is 60-80 mesh; A grid machine is arranged above the hydraulic pulper; The air selection unit is a drum air selection screening machine, which includes a screen drum and a driving mechanism for driving the screen drum to rotate. The screen drum is tilted, the higher end of the screen drum is the feed end, and the lower end of the screen drum is the discharge end. Screen holes are arranged on the wall of the middle section of the screen drum. The feed end of the screen drum is also provided with a blasting device, which is used to blow the sheet-like plastic, paper and cloth in the screen drum out from the discharge end. The adsorption unit is a negative pressure adsorption collector, and the negative pressure adsorption collector comprises a turbine high pressure fan, a circulating air inlet pipe, a jet pipe and a cyclone collector; the upper part of the cyclone collector is a cylindrical body, and the lower part of the cyclone collector is a truncated cone body, the upper end diameter of the truncated cone body is larger than the lower end diameter, the upper end of the truncated cone body is connected to the lower end of the cylindrical body, the upper end of the cylindrical body is provided with a top cover, the top cover is provided with a cylindrical air outlet pipe, the cylindrical air outlet pipe is coaxially arranged with the cylindrical body, the air inlet end of the turbine high pressure fan is connected with the cylindrical air outlet pipe through the circulating air inlet pipe, the air outlet end of the turbine high pressure fan is connected with the cylindrical body through the jet pipe, the air flow in the jet pipe is suitable for entering the cylindrical body along the tangential direction of the cylindrical body, and a negative pressure adsorption port is opened on the jet pipe; The injection pipe includes an air supply pipe, a Laval nozzle, a mixing pipe and an air blowing pipe; the first end of the air supply pipe is connected to the air outlet end of the turbine high-pressure blower, the second end of the air supply pipe is connected to the Laval nozzle, the diameter of the mixing pipe is larger than the diameter of the air supply pipe, and the mixing pipe is suitable for enclosing the Laval nozzle inside it, the first end of the air blowing pipe is connected to the mixing pipe, a negative pressure adsorption port is opened on the wall of the mixing pipe, and the second end of the air blowing pipe is connected to the cylindrical body.

2. The system for sorting and recycling paper from household waste as claimed in claim 1, characterized in that: A collecting cover is arranged at the negative pressure adsorption port.

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