Continuous sludge drying device

Abstract

The utility model discloses a sludge continuous drying device which comprises a crusher, a pre-drying bin and a deep drying bin which are sequentially arranged from top to bottom, the top of the crusher is provided with a feed port, the bottom of the deep drying bin is provided with a discharge port, and the bottom of the crusher is directly communicated with the pre-drying bin; the pre-drying bin is of a vertical structure, an air outlet is formed in one side of the top of the pre-drying bin, a plurality of strip-shaped screens are sequentially arranged on the inner wall of the pre-drying bin from top to bottom, and the pre-drying bin is used for pre-drying crushed sludge; the deep drying bin is of a vertical cylindrical structure, the top of the deep drying bin communicates with the bottom of the pre-drying bin in a flexible connection mode, a rotating device is arranged at the bottom of the deep drying bin in a penetrating mode, and multiple layers of discs are fixed to the interior of the deep drying bin through the circumferential wall of the deep drying bin. The device disclosed by the utility model can realize continuous and efficient drying of the sludge, reduce the sludge treatment cost and promote reduction and resource utilization of the sludge.

Description

Technical Field

[0001] The utility model belongs to the technical field of sludge treatment and disposal, and specifically relates to a sludge continuous drying device. Background Art

[0002] Sludge is rich in nutrients, has a high water content, contains 40-70% organic matter, is easy to rot and stink, and contains harmful substances such as pathogens and heavy metals. If the sludge is not treated and disposed of, it will cause great harm to the environment and human body.

[0003] At present, municipal sludge treatment and disposal mainly focuses on three directions: stabilization, reduction and resource utilization. Stabilization aims to remove or transform harmful substances in sludge through physical, chemical or biological methods to reduce its harm to the environment and human body; reduction reduces the volume and weight of sludge through technical means such as dehydration and drying to reduce treatment costs; resource utilization focuses on the reuse of sludge, such as as fertilizer, soil conditioner or building material raw material.

[0004] The traditional method is usually to dehydrate the sludge to a moisture content of about 80% before transporting it to landfill or other treatment methods. This not only leads to high transportation and treatment costs, but also fails to effectively achieve sludge reduction and resource utilization.

[0005] In recent years, sludge drying and incineration technology has attracted attention because it can significantly reduce the volume and weight of sludge. However, this technology faces problems such as large investment and high operating costs in practical applications, which limits its widespread application. Therefore, the development of a simple, efficient, and continuous sludge drying device has become an urgent need in the current sludge treatment and disposal field. Utility Model Content

[0006] The utility model aims at the problems existing in the prior art and proposes a novel sludge drying device, which aims to realize continuous and efficient sludge drying, reduce treatment costs, and promote sludge reduction and resource utilization.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A sludge continuous drying device comprises a crusher, a pre-drying bin, and a deep drying bin which are arranged in sequence from top to bottom, the top of the crusher is provided with a feed inlet, and the bottom of the deep drying bin is provided with a discharge port, wherein: the bottom of the crusher is directly connected to the pre-drying bin; the pre-drying bin is a vertical structure, one side of the top is provided with an air outlet, and a plurality of strip screens are arranged on the inner wall in sequence from top to bottom for pre-drying the crushed sludge; the deep drying bin is a vertical cylindrical structure, the top is connected to the bottom of the pre-drying bin in a flexible connection, a rotating device is passed through the bottom, and a plurality of layers of discs are fixed inside by means of the circumferential wall of the deep drying bin.

[0009] According to the utility model, a vibrator is provided on the side wall of the pre-drying bin for vibrating the strip screen to prevent the screen from being blocked by sludge.

[0010] According to the utility model, the strip screen of the pre-drying bin is in the shape of a disc, and the inside of the disc has a rod-shaped structure evenly arranged to form a screen, and the gap width of the screen is equal to or slightly smaller than the size of the crushed sludge.

[0011] Preferably, the number of the strip screens is 2 to 4, the upper and lower spacing between two adjacent layers of strip screens is 30 to 70 cm, and the gap width of the bottom layer of strip screens is 25 to 30 mm.

[0012] According to the utility model, the discs arranged inside the deep drying bin include a first layer of non-porous discs and second to fifth layers of perforated discs.

[0013] Preferably, the diameter of the non-porous disc of the first layer is 40 to 80 cm larger than the bottom opening of the pre-drying bin; the diameter of the porous disc of the second layer is 40 to 80 cm larger than that of the non-porous disc of the first layer, and the pore size thereof is 1 / 2 to 2 / 3 of the slit of the bottom strip screen in the pre-drying bin; the diameter of the porous discs of the third to fifth layers is 10 to 30 mm smaller than the inner diameter of the deep drying bin, the slit width of the porous disc of the third layer is 1 / 2 to 2 / 3 of that of the second layer, the slit width of the porous disc of the fourth layer is 1 / 2 to 2 / 3 of that of the third layer, and the slit width of the porous disc of the fifth layer is 2 to 5 mm.

[0014] According to the utility model, the rotating device includes a motor at the bottom and a rotating shaft extending vertically upward from the output shaft of the motor and extending into the interior of the deep drying bin.

[0015] Preferably, a group of paddles are arranged above the non-porous disc and the perforated disc, one end of the paddle is fixed on the rotating shaft, and the other end is 2.5 to 7.5 cm away from the outer edge of the corresponding disc, and a plurality of scrapers are evenly arranged on the bottom surface of the paddle, and the spacing between the lower edge of the scraper and the upper surface of the non-porous disc or the perforated disc is 3 to 6 mm.

[0016] Preferably, the number of blades on the same imperforate disk or perforated disk is 2 to 4, which are evenly distributed along the circumference, and the spacing between the lower edge of the scraper provided under two adjacent blades and the upper surface of the disk is complementary.

[0017] According to the utility model, a plurality of air inlets are arranged on the bottom side wall of the deep drying bin, and the plurality of air inlets are evenly distributed around the bottom side wall.

[0018] The utility model has the following beneficial effects:

[0019] 1. Efficient drying: Through the multi-layer disc and paddle scraper system, combined with the introduction of dry hot air, efficient and continuous drying of sludge is achieved.

[0020] 2. Energy saving and environmental protection: During the drying process, the moisture content of the sludge gradually decreases, and the dust content in the rising air decreases, which is conducive to the subsequent purification and recovery of heat energy.

[0021] 3. Stable operation: Continuous work flow and adjustable drying parameters ensure the stable operation of the device and its ability to adapt to different sludge treatment requirements.

[0022] 4. Easy maintenance: The device has a simple structure and reliable component connection, which reduces the difficulty of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a diagram of the sludge continuous drying device.

[0024] Figure 2 It is a bar screen diagram.

[0025] Figure 3 This is a diagram of a disc scraper.

[0026] Figure 4 It is a diagram of a circular disk with a hole. DETAILED DESCRIPTION

[0027] The technical solution of the utility model is clearly and completely described below with specific embodiments in conjunction with the accompanying drawings. It should be understood that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the utility model.

[0028] The various devices used in the following embodiments, such as the crusher, pre-drying bin, and deep drying bin, can be selected from similar devices known in the prior art according to their respective functions unless otherwise specified. The innovation of the present utility model is not in these devices themselves, but in the overall device system composed of these devices.

[0029] like Figure 1As shown, the sludge continuous drying device of the utility model comprises a crusher 100, a pre-drying bin 200, and a deep drying bin 300 arranged in sequence from top to bottom, the top of the crusher 100 has a feed inlet 10, and the bottom of the deep drying bin 300 has a discharge port 20, wherein:

[0030] The crusher 100 is used to crush the sludge input from the feed port 10 to ≤50 mm, preferably 30-40 mm; the bottom of the crusher 100 is directly connected to the pre-drying bin 200 so that the crushed sludge can directly fall into the pre-drying bin 200.

[0031] The pre-drying bin 200 is a vertical structure, with an air outlet 203 on one side of the top, and multiple strip screens 201 arranged on the inner wall from top to bottom for pre-drying the crushed sludge. A vibrator 202 is arranged on the side wall of the pre-drying bin for vibrating the strip screens 201 to prevent the sludge from clogging the screens. Figure 2 As shown, the strip screen 201 is in the shape of a disc, and the inside of the disc has a rod-shaped structure evenly arranged to form a screen. The gap width of the screen is equal to or slightly smaller than the size of the crushed sludge. The number of the strip screens 201 is 2-4, and the upper and lower spacing between two adjacent layers of strip screens 201 is 30-70cm. The gap width of the bottom layer of the strip screen 201 is 25-30mm.

[0032] The deep drying bin 300 is a vertical cylindrical structure, the top of which is connected to the bottom of the pre-drying bin 200 by a flexible connection, a rotating device 301 is provided at the bottom, and multiple layers of discs are fixed inside by means of the circumferential wall of the deep drying bin 300, including a non-porous disc 303 and a perforated disc 304.

[0033] The non-porous disc 303 is a disc without pores and is used to receive the sludge dropped from the pre-drying bin 200. Figure 4 As shown, the perforated disk 304 is in the shape of a disk, and has evenly arranged rod-shaped structures inside the disk to form pores.

[0034] The soft connection method of the deep drying bin 300 and the pre-drying bin 200 can be achieved by respectively setting flanges at the bottom of the pre-drying bin 200 and the top of the deep drying bin 300 and connecting them with bellows. This is a conventional method in the technical field and will not be described in detail.

[0035] Further, the rotating device 301 includes a motor 3011 at the bottom and a rotating shaft 3012 extending vertically upward from the output shaft of the motor 3011 and extending into the deep drying bin 300. The multi-layer disc is horizontally arranged inside the deep drying bin 300, and a circular hole 3042 is provided in the middle for the rotating shaft 3012 to pass through. Preferably, the multi-layer disc includes a first layer of non-porous discs 303 and second to fifth layers of perforated discs 304. Several connecting rods 3041 are welded to the outer edges of the non-porous discs 303 and the perforated discs 304, and the outer ends of the connecting rods are welded and fixed to the inner wall of the deep drying bin 300, so that the discs are horizontally arranged inside the deep drying bin 300.

[0036] Furthermore, the diameter of the first layer of non-porous disc 303 is 40-80 cm larger than the discharge port of the pre-drying bin, and is used to receive the pre-dried sludge.

[0037] The diameter of the second layer of perforated discs 304 is 40-80cm larger than that of the first layer of non-perforated discs, and the pore width is 1 / 2-2 / 3 of the slit width of the bottom layer of strip screen in the pre-drying bin. The diameters of the third to fifth layers of perforated discs 304 are 10-30mm smaller than the inner diameter of the deep drying bin, the pore width of the third layer of perforated discs is 1 / 2-2 / 3 of the pore width of the second layer of perforated discs, the pore width of the fourth layer of discs is 1 / 2-2 / 3 of the pore width of the third layer, and the pore width of the fifth layer of discs is 1 / 2-2 / 3 of the pore width of the fourth layer, and the width is 2-5mm.

[0038] like Figure 4 As shown, the pores of the perforated disk are all strip-shaped pores.

[0039] like Figure 3 As shown, a group of paddles 302 are arranged above the non-porous disk 303 and the perforated disk 304, one end of the paddle 302 is fixed on the rotating shaft 3012, and the other end is 2.5-7.5 cm away from the outer edge of the corresponding disk, and a plurality of scrapers 3021 are evenly arranged on the bottom surface of the paddle 302, and the spacing between the lower edge of the scraper 3021 and the upper surface of the disk (non-porous disk 303 or perforated disk 304) is 3-6 mm.

[0040] Among them, the number of blades on the same disc is 2-4, which are evenly distributed along the circumference, and the lower edge of the scraper 3021 arranged under two adjacent blades 302 is complementary to the distance between the upper surface of the disc, that is, the sludge left between the scrapers of one blade will be scraped by the scraper carried by the subsequent blade.

[0041] The bottom side wall of the deep drying bin 300 is provided with a plurality of air inlets 305, which are evenly distributed around the bottom side wall and are used to introduce hot dry air; preferably, the number of the air inlets 305 is 2-4. The temperature of the hot dry air is 60-90°C, preferably 70-80°C. The hot dry air rises from the bottom to the top, and cooperates with the disc, which can not only slow down the falling speed of the crushed sludge, but also reduce the dust content in the exhaust gas.

[0042] The production process of the sludge continuous drying device using the utility model is as follows:

[0043] 1. Crushing process:

[0044] The sludge enters the crusher 100 from the feed port 10 for crushing. The size of the crushed sludge is no more than 50 mm, preferably 30-40 mm.

[0045] 2. Pre-drying treatment:

[0046] The crushed sludge falls into the pre-drying bin 200 and is pre-dried by the strip screen 201. At the same time, the vibrator 202 is started to vibrate the screen to prevent the sludge from clogging the screen.

[0047] 3. Deep drying treatment:

[0048] The pre-dried sludge falls onto the first layer of non-porous disc 303 at the top of the deep drying bin 300. The rotating device 301 drives the paddle 302 above the disc to rotate slowly, and a scraper 3021 is installed under the paddle to mix the sludge on the disc and scrape it to the second layer of disc. The paddle above the second layer of disc rotates synchronously with the paddle of the first layer, further mixing the sludge evenly and scraping it to the third layer of disc. The third to fifth layers of discs are all perforated discs, and the pores of the discs are all strip-shaped pores. By analogy, the sludge is scraped to the bottom of the pre-drying bin 200.

[0049] The rotating device 301 has a rotation speed of 0.5-3 r / min and can rotate forward and reverse to meet the needs of different drying stages.

[0050] 4. Dry hot air treatment:

[0051] The hot dry air enters from the air inlet 305 at the bottom of the deep drying bin and is discharged from the bottom to the air outlet 203. The hot dry air takes out the moisture in the sludge during the rising process, thus achieving sludge drying. Since the moisture content of the sludge gradually decreases from top to bottom in the device, and the moisture content in the rising air gradually increases, the dust content gradually decreases, which is beneficial to the subsequent purification and recycling of waste heat energy.

[0052] 5. Discharging:

[0053] After the above-mentioned continuous drying treatment, the dried sludge is discharged from the discharge port 20 of the deep drying bin 300, completing the entire drying process.

[0054] The utility model of the sludge continuous drying device has a simple internal structure, is easy to operate, and has a low manufacturing cost. The water in the sludge is taken out by the flow of dry hot air in the device, thereby realizing continuous drying of the sludge. At the same time, the water content of the sludge gradually decreases from top to bottom in the device, while the water content in the rising air gradually increases, and the dust content gradually decreases, which is beneficial to the subsequent purification and recycling of waste heat energy.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims

1. A sludge continuous drying device, characterized in that: It includes a crusher, a pre-drying bin, and a deep drying bin arranged in sequence from top to bottom, the top of the crusher has a feed inlet, and the bottom of the deep drying bin has a discharge port, wherein: The bottom of the crusher is directly connected to the pre-drying bin; The pre-drying bin is a vertical structure, with an air outlet on one side of the top, and multiple strip screens arranged on the inner wall from top to bottom to pre-dry the crushed sludge; The deep drying bin is a vertical cylindrical structure, the top of which is connected to the bottom of the pre-drying bin in a flexible connection, a rotating device is provided at the bottom, and multiple layers of discs are fixed inside by means of the circumferential wall of the deep drying bin.

2. The sludge continuous drying device according to claim 1, characterized in that: A vibrator is provided on the side wall of the pre-drying bin for vibrating the strip screen to prevent the screen from being blocked by sludge.

3. The sludge continuous drying device according to claim 1, characterized in that: The strip screen of the pre-drying bin is in the shape of a disc, and the inside of the disc has a rod-shaped structure evenly arranged to form a screen, and the gap width of the screen is equal to or slightly smaller than the size of the crushed sludge.

4. The sludge continuous drying device according to claim 3, characterized in that: The number of the strip screens is 2 to 4, the upper and lower spacing between two adjacent layers of strip screens is 30 to 70 cm, and the gap width of the bottom layer of strip screens is 25 to 30 mm.

5. The sludge continuous drying device according to claim 1, characterized in that: The discs arranged inside the deep drying bin include a first layer of non-porous discs and second to fifth layers of perforated discs.

6. The sludge continuous drying device according to claim 5, characterized in that: The diameter of the first layer of non-porous disc is 40 to 80 cm larger than the bottom opening of the pre-drying bin; The diameter of the second layer of perforated discs is 40 to 80 cm larger than that of the first layer of non-perforated discs, and the pore size is 1 / 2 to 2 / 3 of the slit of the bottom layer of strip screen in the pre-drying bin; The diameters of the perforated discs from the third to fifth layers are 10 to 30 mm smaller than the inner diameter of the deep drying bin, the gap width of the perforated discs in the third layer is 1 / 2 to 2 / 3 of that in the second layer, the gap width of the perforated discs in the fourth layer is 1 / 2 to 2 / 3 of that in the third layer, and the gap width of the perforated discs in the fifth layer is 2 to 5 mm.

7. The sludge continuous drying device according to claim 1, characterized in that: The rotating device comprises a motor at the bottom and a rotating shaft extending vertically upward from the output shaft of the motor and extending into the interior of the deep drying bin.

8. The sludge continuous drying device according to claim 5, characterized in that: A group of paddles are arranged above the non-porous disc and the perforated disc, one end of the paddle is fixed on the rotating shaft, and the other end is 2.5 to 7.5 cm away from the outer edge of the corresponding disc. A plurality of scrapers are evenly arranged on the bottom surface of the paddle, and the spacing between the lower edge of the scraper and the upper surface of the non-porous disc or the perforated disc is 3 to 6 mm.

9. The sludge continuous drying device according to claim 8, characterized in that: The number of blades on the same non-porous disc or perforated disc is 2 to 4, which are evenly distributed along the circumference, and the spacing between the lower edge of the scraper arranged under two adjacent blades and the upper surface of the disc is complementary.

10. The sludge continuous drying device according to claim 1, characterized in that: The bottom side wall of the deep drying bin is provided with a plurality of air inlets, and the plurality of air inlets are evenly distributed around the bottom side wall.

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