RDF fuel rod raw material drying and dehydrating device

Abstract

The utility model relates to the field of dehydration technology, and discloses an RDF fuel rod raw material drying and dehydrating device which comprises a pre-pressing box, a cavitation generator, a centrifugal machine and a drying assembly. Then the sludge is sucked into a containing cavity of the cavitation generator from the two ends by a high-pressure water pump of the cavitation generator to be subjected to cavitation reaction, most microorganisms in the sludge material are killed while cell walls are destroyed, the centrifugal machine is communicated with the cavitation generator and is connected with the cavitation generator, and most moisture of the sludge material is rapidly removed under the action of centrifugal force; and finally, the raw materials are sprayed out by a discharge port of the cavitation generator, enter a drying assembly and are dried to be below the water content limit value, and finally raw materials suitable for manufacturing the RDF fuel rods are obtained. The method has the effects of rapidly reducing the water content in the garbage and improving the preparation efficiency of the RDF fuel raw material.

Description

Technical Field

[0001] The utility model relates to the field of dehydration technology, in particular to a RDF fuel rod raw material drying and dehydration device. Background Art

[0002] In order to pursue environmental protection and advocate a healthy and green lifestyle, higher requirements have been placed on fuel selection. Fuel is made by crushing, sorting, drying, adding agents, and compressing combustible waste. Converting domestic waste into combustible solid fuel RDF is a more mature waste treatment method in developed countries abroad. Japan, South Korea and other countries have widely used RDF fuel for power generation or heating. my country is also actively carrying out RDF fuel projects that turn waste into treasure.

[0003] The existing RDF fuel raw material processing method can refer to the patent document with publication number CN106824976A. The above patent document discloses a method for preparing derivative fuel RDF raw materials, bio-organic fertilizer raw materials and inorganic building material raw materials using garbage as raw materials. After crushing, the urban wet garbage composed of most organic matter, a small part of inorganic matter and a trace amount of waste products such as cloth and paper is in a sludge state. The screened material after drum screening is semi-wet crushed for the second time to a block with a size of ≤40mm, and then the block is dried to a moisture content of ≤20% to obtain the derivative fuel RDF raw material.

[0004] However, since organic matter accounts for the majority of the final material, it is difficult to quickly remove moisture through pressing. It mainly relies on long-term heating to dry out the moisture inside the organic matter that cannot be discharged autonomously, which is time-consuming and labor-intensive and is not conducive to efficient production. Utility Model Content

[0005] In order to quickly reduce the water content in garbage and improve the preparation efficiency of RDF fuel raw materials, the present application provides an RDF fuel rod raw material drying and dehydration device.

[0006] The present application provides a RDF fuel rod raw material drying and dehydration device, which adopts the following technical solution:

[0007] An RDF fuel rod raw material drying and dehydration device, comprising a pre-pressing box, a cavitation generator and a drying assembly;

[0008] The top of the pre-pressing box is provided with a feed port, two pressing rollers with opposite rotation directions are rotatably connected in the pre-pressing box, the two pressing rollers are parallel to each other, and the bottom of the pre-pressing box is provided with two discharge ports;

[0009] The cavitation generator is hollow inside and has a narrow accommodation chamber, high-pressure water pumps are symmetrically arranged at both ends of the accommodation chamber, the high-pressure water pumps are connected to the discharge ports in a one-to-one correspondence, and a discharge port is opened on the side wall of the accommodation chamber, and the discharge port is located between the two high-pressure water pumps;

[0010] The drying component is arranged downstream of the cavitation generator.

[0011] By adopting the above technical solution, a cavitation generator is set between the pre-pressing box and the drying component. The garbage is further crushed and broken by the pre-pressing box to obtain sludge garbage. The high-pressure water pump sucks the sludge into the narrow holding chamber from both ends. The reverse jets collide in the holding chamber, forming tiny bubbles locally. These bubbles are then brought to the high-pressure area and collapse rapidly, generating great energy. This process is called cavitation.

[0012] Cavitation creates a high temperature and high pressure environment, which can kill most microorganisms in the garbage sludge and destroy their cell walls, so that more water can be filtered out. The sludge is finally ejected from the discharge port and enters the drying component. The cavitation generator can break the wall of organic residues in the sludge. Therefore, for garbage sludge with organic matter as the main part, it can quickly reduce the water content in the subsequent drying process, which is convenient for improving the preparation efficiency of RDF fuel raw materials.

[0013] Furthermore, it also includes a centrifuge, the cavitation generator is connected to the centrifuge through the discharge port, and a water outlet is provided at the bottom of the centrifuge.

[0014] By adopting the above technical solution, a centrifuge is set to cooperate with a cavitation generator. The centrifugal force allows most of the flowing water in the cavitated sludge to be discharged. Compared with drying, it can achieve rapid dehydration, and only the remaining residue needs to be transported to the drying component.

[0015] Furthermore, the drying component includes a conveying device, and a heating belt is laid on the conveying device.

[0016] By adopting the above technical solution and laying a heating track on the conveying equipment, the drying and transportation functions can be combined, thereby making more effective and efficient use of time.

[0017] Furthermore, the heating track is formed by splicing electric heating plates.

[0018] By adopting the above technical solution, the heating track formed by the electric heating plates is in direct contact with the material, and the material is spread flat on the electric heating plates, which can maximize the contact area and thus improve the drying efficiency.

[0019] Furthermore, a plurality of screens are disposed adjacent to the end of the conveying device, and the mesh openings of the screens gradually decrease from top to bottom.

[0020] By adopting the above technical solution, cavitation technology can kill microorganisms and parasite eggs based on its destructive effect on cells, and achieve stabilization and harmless treatment of sludge. Therefore, the waste filtered during the production of RDF fuel can be directly used in the production of agricultural cultivation substrates. Therefore, multiple screens are set up to recycle the materials obtained at each level according to different needs.

[0021] Furthermore, the heating crawler is vertically spirally wound on the conveying device, the conveying direction is from bottom to top, and the spiral radius gradually increases from bottom to top.

[0022] By adopting the above technical solution, in order to leave enough height space for setting up the screen, the conveying equipment mainly composed of a heating track is selected to transfer from bottom to top, so that the end of the conveying equipment is located at a higher place so that the material can fall from a high place; spiral winding and gradually increasing the radius can increase the transportation distance and make the drying more complete.

[0023] Furthermore, an air extraction component is provided above the conveying device.

[0024] By adopting the above technical solution, the provision of an exhaust component can speed up air flow, improve water evaporation efficiency, and thus accelerate drying. In addition, the exhaust component can also play a deodorizing role.

[0025] Furthermore, the air extraction component is located in the center of the conveying equipment, and the air extraction component includes a vertically arranged air collecting pipe and a plurality of negative pressure fans. The plurality of negative pressure fans are fixedly installed in the air collecting pipe at intervals of height, and the peripheral wall of the air collecting pipe is provided with air inlets corresponding to the positions of the negative pressure fans.

[0026] By adopting the above technical solution, the empty space formed in the center of the spiral structure of the heating track is utilized to set the exhaust component into the form of multiple negative pressure fans connected vertically in series, so that the materials in various parts of the heating track can be sucked by the negative pressure fan.

[0027] Furthermore, the peripheral wall of the pressure roller is densely covered with crushing nails.

[0028] By adopting the above technical solution, the closely laid crushing nails can improve the squeezing and crushing effects of the pressure roller.

[0029] Furthermore, the discharge port is connected to a one-way valve.

[0030] By adopting the above technical solution, the one-way valve can seal the accommodating chamber in the initial stage, which is conducive to the rapid increase of the pressure in the accommodating chamber until it breaks through the limit of the one-way valve, thereby making the cavitation effect more intense.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. By setting a cavitation generator between the pre-pressurization box and the drying component, the high-pressure water pump sucks the sludge from both ends into the narrow holding chamber, and the reverse jets collide in the holding chamber, causing the tiny bubbles to collapse rapidly. The high-temperature and high-pressure environment formed by cavitation can kill most of the microorganisms in the garbage sludge and destroy their cell walls, so that more water can be filtered out. Therefore, when treating garbage sludge with organic matter as the main part, it can quickly reduce the water content in the subsequent drying process, which is convenient for improving the preparation efficiency of RDF fuel raw materials;

[0033] 2. By setting up a conveying device made of spiral heating crawlers as a drying component, it is possible to combine drying and transportation functions, efficiently utilize time, and extend the conveying journey as much as possible to make drying more complete;

[0034] 3. By transporting and drying materials from bottom to top, the multiple screens installed at high places are matched, and the exhaust components matching them are set according to the structure and position of the conveying equipment, which can speed up the air flow, improve the evaporation efficiency of water and deodorize. The vertical series connection of multiple negative pressure fans allows the materials in various parts of the heating crawler to be sucked by the negative pressure fans. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of an RDF fuel rod raw material drying and dehydration device according to an embodiment of the present application.

[0036] Figure 2 It is a schematic diagram of the cavitation generator structure.

[0037] Figure 3 It is a schematic diagram of the structure of the exhaust component.

[0038] Description of reference numerals:

[0039] 1. Pre-pressing box; 11. Feeding port; 12. Pressing roller; 121. Crushing nail; 13. Discharging port; 2. Cavitation generator; 21. Accommodating chamber; 22. High-pressure water pump; 23. Discharging port; 24. One-way valve; 3. Centrifuge; 31. Water outlet; 4. Drying component; 41. Conveying equipment; 42. Heating crawler; 421. Electric heating plate; 5. Screen; 6. Exhaust component; 61. Gas collecting pipe; 611. Air inlet; 62. Negative pressure fan. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-3 The technical solution of this application is described clearly and completely.

[0041] The embodiment of the present application discloses a RDF fuel rod raw material drying and dehydration device.

[0042] Reference Figure 1 A device for drying and dehydrating RDF fuel rod raw materials includes a pre-pressing box 1, a cavitation generator 2, a centrifuge 3 and a drying component 4 according to the processing flow. The pre-pressing box 1 further crushes and grinds the garbage raw materials after sorting and processing to form a fluid mud material, and the cavitation effect of the cavitation generator 2 kills most of the microorganisms in the mud and destroys their cell walls, and then most of the water is quickly removed under the action of centrifugal force, and finally the drying component 4 dries the material to below the limit water content to obtain the raw material suitable for making RDF fuel rods.

[0043] Reference Figure 1 , Figure 2 A feed port 11 is provided at the top of the pre-pressing box 1, and two pressure rollers 12 with opposite rotation directions are rotatably connected inside the pre-pressing box 1. The two pressure rollers 12 are parallel to each other, and are preferably made of stone or steel with heavy weight and excellent mechanical properties. The pre-pressing box 1 is preferably made of anti-corrosion material or the inner wall is painted with anti-corrosion paint. The peripheral wall of the pressure roller 12 is densely paved with crushing nails 121 along the length direction to improve the extrusion and crushing effect of the pressure roller 12. A driving motor is fixedly installed on the outer wall of the pre-pressing box 1, and gears are coaxially fixedly installed at the ends of the two pressure rollers 12. The gears are meshed, and the driving motor drives one of the gears to rotate to achieve synchronous reverse rotation of the two pressure rollers 12. Two discharge ports 13 are provided at the bottom of the pre-pressing box 1, which are respectively connected to the two ends of the cavitation generator 2.

[0044] Reference Figure 2 The cavitation generator 2 has a hollow interior with a narrow and long accommodating chamber 21, and high-pressure water pumps 22 are symmetrically arranged at both ends of the accommodating chamber 21, and the high-pressure water pumps 22 are connected to the discharge port 13 in a one-to-one correspondence. The high-pressure water pump 22 sucks the sludge from both ends into the narrow accommodating chamber 21 for cavitation. The reverse jets collide in the accommodating chamber 21, forming tiny bubbles locally, which are then brought to the high-pressure area and collapse rapidly, generating huge energy. Cavitation forms a high-temperature and high-pressure environment, which can kill most microorganisms in the garbage sludge and destroy their cell walls, so that more water can be filtered out. The cavitation generator 2 can break the wall of organic residues in the sludge. Therefore, for garbage sludge in which organic matter accounts for the main part, it can quickly reduce the water content in the subsequent drying process, which is convenient for improving the preparation efficiency of RDF fuel raw materials.

[0045] Reference Figure 2, a discharge port 23 is provided on the side wall of the accommodating chamber 21, and the discharge port 23 is connected to a one-way valve 24. The one-way valve 24 enables the accommodating chamber 21 to seal the accommodating chamber 21 in the initial stage, which is conducive to the rapid increase of the pressure in the accommodating chamber 21 until it breaks through the limit of the one-way valve 24, thereby making the cavitation effect more intense. The discharge port 23 is preferably located in the central position of the side wall of the accommodating chamber 21 so that the jet stroke lengths sucked on both sides are the same. The cavitation generator 2 is connected to the centrifuge 3 through the discharge port 23, and the sludge is finally ejected from the discharge port 23 and enters the centrifuge 3. The vertically arranged centrifuge 3 is cylindrical, and a water outlet 31 is provided at the bottom of the centrifuge 3. During the centrifugal dehydration process, the wastewater flows downward and is discharged along the water outlet 31. It is worth noting that the feed port of the centrifuge 3 is arranged on the side wall, which can facilitate the effective separation of the dehydrated material and the wastewater.

[0046] Reference Figure 1 The drying component 4 includes a conveying device 41, and the conveying device 41 includes a frame and a power device. A heating track 42 is laid on the frame. The power device drives the heating track 42 to move along the frame to dry the material during the conveying process, thereby making fuller and more efficient use of time. The heating track 42 is preferably spliced ​​by electric heating plates 421, and an intelligent control system is used to control the heating power and duration of the electric heating plates 421. The heating track 42 spliced ​​by the electric heating plates 421 is in direct contact with the material. The material is laid flat on the electric heating plates 421, which can maximize the contact area and improve the drying efficiency.

[0047] Reference Figure 1 , a multi-pass screen 5 is provided adjacent to the end of the conveying device 41, and the mesh of the screen 5 gradually decreases from top to bottom. Cavitation technology can kill microorganisms and parasite eggs based on its destructive effect on cells, and realizes the stabilization and harmless treatment of sludge. Therefore, the waste filtered during the production of RDF fuel can be directly used in the production of agricultural cultivation substrates. Therefore, a multi-pass screen 5 is provided, and the materials obtained by screening at various levels can be recycled according to different needs. The heating crawler 42 is vertically spirally wound on the conveying device 41. In order to leave enough height space for setting the screen 5, the conveying device 41 mainly composed of the heating crawler 42 is selected to be transferred from bottom to top, so that the end of the conveying device 41 is located at a higher place, so that the material falls from a high place for screening. Spiral winding and gradually increasing the radius can increase the transportation journey and make the drying more sufficient.

[0048] Reference Figure 1 , Figure 3, an exhaust assembly 6 is provided above the conveying device 41, and the exhaust assembly 6 is fixedly installed in the center of the conveying device 41. The exhaust assembly 6 can speed up the air flow, improve the water evaporation efficiency, and thus accelerate the drying. In addition, the exhaust assembly 6 can also play a deodorizing role. The exhaust assembly 6 includes a vertically arranged air collecting pipe 61 and a plurality of negative pressure fans 62. The plurality of negative pressure fans 62 are fixedly installed in the air collecting pipe 61 at intervals of height, and air inlets 611 are opened on the peripheral wall of the air collecting pipe 61 corresponding to the positions of the negative pressure fans 62. By utilizing the free space formed in the center of the spiral structure of the heating track 42, the exhaust assembly 6 is arranged in the form of a plurality of negative pressure fans 62 connected vertically in series, so that the materials at various positions on the heating track 42 can be subjected to the suction effect of the negative pressure fans 62.

[0049] The above are all preferred embodiments of the present application. Obviously, the embodiments described above are only preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made by ordinary technicians in this field based on the structure, shape, and principle of the present application without making any creative work should be covered within the protection scope of the present application.

Claims

1. A RDF fuel rod raw material drying and dehydration device, characterized by: It comprises a pre-pressing box (1), a cavitation generator (2) and a drying component (4); The pre-pressing box (1) has a feed port (11) at the top, two pressing rollers (12) with opposite rotation directions are rotatably connected in the pre-pressing box (1), and the two pressing rollers (12) are parallel to each other. The pre-pressing box (1) has two discharge ports (13) at the bottom; The cavitation generator (2) is hollow inside and provided with a narrow accommodation chamber (21), and high-pressure water pumps (22) are symmetrically provided at both ends of the accommodation chamber (21), and the high-pressure water pumps (22) are connected to the discharge ports (13) in a one-to-one correspondence, and a discharge port (23) is opened on the side wall of the accommodation chamber (21), and the discharge port (23) is located between the two high-pressure water pumps (22); The drying component (4) is arranged downstream of the cavitation generator (2).

2. The RDF fuel rod raw material drying and dehydration device according to claim 1, characterized in that: It also comprises a centrifuge (3), wherein the cavitation generator (2) is connected to the centrifuge (3) via the discharge port (23), and a water outlet (31) is provided at the bottom of the centrifuge (3).

3. The RDF fuel rod raw material drying and dehydration device according to claim 1 or 2, characterized in that: The drying component (4) comprises a conveying device (41), on which a heating belt (42) is laid.

4. The RDF fuel rod raw material drying and dehydration device according to claim 3, characterized in that: The heating track (42) is formed by splicing electric heating plates (421).

5. The RDF fuel rod raw material drying and dehydration device according to claim 4, characterized in that: A plurality of screens (5) are disposed adjacent to the end of the conveying device (41), and the mesh openings of the screens (5) gradually decrease from top to bottom.

6. The RDF fuel rod raw material drying and dehydration device according to claim 5, characterized in that: The heating crawler belt (42) is vertically spirally wound on the conveying device (41), the conveying direction is from bottom to top, and the spiral radius gradually increases from bottom to top.

7. The RDF fuel rod raw material drying and dehydration device according to claim 6, characterized in that: An air extraction component (6) is provided above the conveying device (41).

8. The RDF fuel rod raw material drying and dehydration device according to claim 7, characterized in that: The air extraction component (6) is located in the center of the conveying equipment (41), and the air extraction component (6) includes a vertically arranged air collecting pipe (61) and a plurality of negative pressure fans (62). The plurality of negative pressure fans (62) are fixedly installed in the air collecting pipe (61) at intervals of height, and the peripheral wall of the air collecting pipe (61) is provided with air inlets (611) corresponding to the positions of the negative pressure fans (62).

9. The RDF fuel rod raw material drying and dehydration device according to claim 1, characterized in that: The peripheral wall of the pressure roller (12) is densely covered with crushing nails (121).

10. The RDF fuel rod raw material drying and dehydration device according to claim 1, characterized in that: The discharge port (23) is connected to a one-way valve (24).

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