A sludge granulation device

Abstract

The present invention discloses a sludge granulation device, including a shell, wherein a kneading granulation conveyor belt and a vibrating conveyor belt are arranged in the shell, a kneading arc surface is processed on the inner wall of the shell corresponding to the position of the discharge end of each layer of the kneading granulation conveyor belt, a kneading granulation channel is formed between adjacent kneading granulation conveyor belts, and a vibrator is installed on the inner side of the vibrating conveyor belt; a strip cutting device is arranged on the top of the shell, and the strip cutting device includes a knife holder, a driving mechanism for driving the knife holder, and a plurality of strip cutting blades arranged at equal intervals at the bottom of the knife holder. The sludge granulation device of the present application is adopted, firstly, the sludge is cut into equal parts by the strip cutting blade, and then the sludge is kneaded and formed by the kneading and squeezing between the kneading granulation conveyor belt and the kneading arc surface and the kneading and squeezing of the kneading granulation channel in turn, and finally the sludge particles are vibrated and dispersed by the vibrator to avoid adhesion, thereby ensuring the consistency of the particle size of the sludge particles and greatly improving the efficiency and uniformity of the sludge granulation.

Description

Technical Field

[0001] The invention relates to the technical field of sludge treatment, and in particular to a sludge granulation device. Background Art

[0002] With the development of urban construction and the improvement of living standards, domestic sewage and industrial wastewater are increasing. Various environmental protection policies have restricted the treatment of various types of sewage. Sewage treatment facilities are becoming more and more complete. However, sludge is a product of sewage treatment. The amount of municipal sludge in my country is very large, with an annual output of about 1.5 million tons, and more than half of it has not been effectively treated, causing serious harm to the environment.

[0003] In the treatment of urban sewage, a large number of derivatives will appear, and municipal sludge is one of them. Usually, municipal sludge is composed of various bacterial cells, colloids, organic fragments and inorganic particles. Its structure is very complex and it is a special heterogeneous body. In terms of properties, the proportion of organic matter often exceeds half, and the content of nutrients such as N and P is very high, among which the content of N is mostly 1.5% to 7.0%, and the content of P is 0.8% to 3%. The water quality treatment method and application technology of urban sewage are directly related to the output of municipal sludge. In the process of sewage treatment, the sludge produced accounts for about 3‰ to 5‰ of its total amount. On the whole, my country's municipal sludge has the characteristics of complex structure and large output. Most of it is rich in organic matter, easy to corrode, emits stench, and brings secondary pollution to the environment. These characteristics of my country's municipal sludge make it possible to be used as fertilizer after treatment, and it has very high utilization potential.

[0004] At present, the methods for batch treatment of urban domestic sludge are generally physical methods and biochemical methods. Physical methods are generally mechanical treatment or drying treatment. Among them, mechanical dehydration is mainly plate and frame / screw dehydration, which is simply to squeeze out the water. Generally, the moisture content after extrusion is generally between 60% and 85%, and the moisture content is still relatively large. Drying treatment is generally to treat the sludge after mechanical dehydration again to remove most of the water contained in the sludge, and then treat the remaining slag harmlessly or convert it to other uses. Compared with the biochemical treatment method, the physical drying treatment method has significant advantages, such as small area occupied by the treatment equipment, short treatment cycle, and not easy to cause secondary pollution. Drying is divided into high-temperature drying and low-temperature drying. High-temperature drying will cause harmful substances in the mud to volatilize and the stability and safety of high-temperature equipment are poor and have been gradually phased out. Low-temperature drying is to use circulating hot air (generally 40-45°C) to evaporate the water in the sludge. Because the temperature is low, harmful substances cannot volatilize and the temperature is low, the stability and safety of the equipment are greatly improved.

[0005] Before the sludge is dried, it needs to be granulated. The current sludge granulator, as shown in CN207463173U, CN103316609A, etc., is a roller mutual extrusion type granulator, which is mainly composed of two rollers rotating in opposite directions at the same speed. The surfaces of the two rollers are provided with grooves or the surface of one roller is provided with grooves, and the surface of the other roller is provided with protrusions, so as to form a granulation space. The disadvantages of the granulator of this structure are: it forms particles by mutual extrusion of the grooves and protrusions. During the granulation process, the sludge is easy to adhere to the grooves and affect the granulation efficiency and uniformity of the granulation. For larger sludge particles, the same temperature requires a longer drying time, and for small and regular sludge particles, the time is shorter. Therefore, if the particle size is uneven, it is easy to cause low drying efficiency and energy waste. Summary of the invention

[0006] In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a sludge granulation device so as to improve the efficiency and uniformity of granulation.

[0007] The present invention solves the above problems by the following technical means:

[0008] A sludge granulation device comprises a shell, wherein a feed hopper is arranged at the top end of the shell, a discharge port is arranged at the bottom end, at least two layers of kneading granulation conveyor belts and at least one layer of vibrating conveyor belt are arranged in the shell, a kneading arc surface is processed on the inner wall of the shell corresponding to the position of the discharge end of each layer of kneading granulation conveyor belt, a kneading granulation channel is formed between adjacent kneading granulation conveyor belts, and a vibrator is installed on the inner side of the vibrating conveyor belt; a strip cutting device is arranged on the top of the shell, and the strip cutting device comprises a knife holder which is sealed and slidably matched with the top of the shell, a driving mechanism which drives the knife holder to move up and down, and a plurality of strip cutting blades which are installed in parallel and at equal intervals at the bottom of the knife holder.

[0009] Furthermore, a sludge thickness control plate is provided on the side wall of the feed hopper.

[0010] Furthermore, the sludge thickness control plate is connected to the side wall of the feed hopper through a telescopic rod.

[0011] Furthermore, a scraper is provided on the kneading granulation conveyor belt.

[0012] Furthermore, the scraper comprises a fixed plate body and a movable plate body which are sealed and slidably sleeved, and one end of the movable plate body located inside the fixed plate body is connected to the inner wall of the fixed plate body through a spring.

[0013] Furthermore, the driving mechanism is an inverted oil cylinder or air cylinder.

[0014] Furthermore, the kneading arc surface is concentrically matched with the end arc surface of the kneading granulation conveyor belt.

[0015] Furthermore, the feed hopper is nested with the shell.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The sludge granulation device of the present application first cuts the sludge into equal parts by a strip cutting blade, and then kneads and shapes the sludge by kneading and extruding between a kneading granulation conveyor belt and a kneading arc surface and by kneading and extruding in a kneading granulation channel, and finally vibrates and disperses the sludge particles by a vibrator to avoid adhesion, thereby ensuring the consistency of the particle size of the sludge particles and greatly improving the efficiency and uniformity of sludge granulation.

[0018] 2. The sludge granulation device of the present application, by arranging a sludge thickness control plate on the side wall of the feed hopper, can relatively strictly control the thickness of the sludge entering the kneading granulation conveyor belt through the sludge thickness control plate (the sludge thickness is controlled by the distance between the sludge thickness control plate and the top layer of the kneading granulation conveyor belt), thereby further improving the uniformity of sludge granulation; the sludge thickness control plate is driven to rise and fall by a telescopic rod, and the distance between the sludge thickness control plate and the top layer of the kneading granulation conveyor belt can be adjusted to adjust the sludge thickness.

[0019] 3. The sludge granulation device of the present application is provided with a scraper on the kneading granulation conveyor belt. On the one hand, the scraper can scrape off the sludge adhering to the kneading arc surface, and on the other hand, the scraper can scrape off the sludge on the adjacent kneading granulation conveyor belt. Therefore, the provision of the scraper can further improve the efficiency and uniformity of granulation.

[0020] 4. The sludge is transported back and forth on the kneading granulation conveyor belt and the vibration conveyor belt, which is beneficial to saving the overall granulation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0023] Figure 2 It is an enlarged schematic diagram of a scraper according to an embodiment of the present invention.

[0024] In the figure: 1--shell; 2--vibrating conveyor belt; 3--vibrator; 4--scraper; 5--kneading arc surface; 6--kneading granulation conveyor belt; 7--feeding hopper; 8--telescopic rod; 9--sludge thickness control board; 10--knife holder; 11--strip cutting blade; 12--driving mechanism; 13--sludge; 14--discharge port; 41--fixed plate body; 42--movable plate body; 43--spring. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings.

[0026] See also Figure 1-2 As shown, this embodiment discloses a sludge granulation device, including a shell 1, a feed hopper 7 is provided at the top of the shell 1, and a discharge port 14 is provided at the bottom. A sludge thickness control plate 9 is provided on one side of the outlet at the bottom of the feed hopper, and the sludge thickness control plate 9 is connected to the side wall of the feed hopper 7 through a telescopic rod 8, and the telescopic rod 8 includes a cylinder and a rod body that are slidably sleeved, and the cylinder and the rod body are slidably locked by a locking screw. Through the sludge thickness control plate 9, the thickness of the sludge entering the kneading granulation conveyor belt can be relatively strictly controlled (the sludge thickness is controlled by the distance between the sludge thickness control plate and the top kneading granulation conveyor belt); the sludge thickness control plate is driven to rise and fall by the telescopic rod, and the distance between the sludge thickness control plate and the top kneading granulation conveyor belt can be adjusted to adjust the sludge thickness. In some preferred embodiments, the feed hopper 7 is nested with the shell 1, so that the feed hopper can be removed and the sludge thickness control plate can be adjusted.

[0027] At least two layers of kneading and granulating conveyor belts 6 and at least one layer of vibrating conveyor belts 2 are arranged in the shell 1. In the present embodiment, two layers of kneading and granulating conveyor belts 6 and three layers of vibrating conveyor belts 2 are arranged, and the kneading and granulating conveyor belts and the vibrating conveyor belts are turned back and forth in sequence for transmission; a kneading arc surface 5 is processed on the inner wall of the shell 1 at the position corresponding to the discharge end of each layer of kneading and granulating conveyor belt 6, and the kneading arc surface is concentrically matched with the end arc surface of the kneading and granulating conveyor belt, and a kneading granulation channel is formed between adjacent kneading and granulating conveyor belts.

[0028] The kneading granulation conveyor belt 6 is provided with a scraper 4. On the one hand, the scraper 4 can scrape off the sludge adhered to the kneading arc surface 5, and on the other hand, the scraper 4 can scrape off the sludge on the adjacent kneading granulation conveyor belt 6. Preferably, the scraper includes a fixed plate body 41 and a movable plate body 42 that are sealed and slidably sleeved, and one end of the movable plate body 42 located in the fixed plate body 41 is connected to the inner wall of the fixed plate body through a spring 43. With this structural design, the overall height of the scraper can be adaptively adjusted elastically to meet the use requirements of different kneading granulation conveyor belt spacings and different kneading granulation conveyor belt and kneading arc surface spacings.

[0029] A vibrator 3 is installed inside the vibration conveyor belt 2. A strip cutting device is arranged on the top of the housing 1, and the strip cutting device comprises a knife holder 10 which is sealed and slidably matched with the top of the housing, a driving mechanism 12 which drives the knife holder to move up and down, and a plurality of strip cutting blades 11 which are installed in parallel and at equal intervals at the bottom of the knife holder, and the driving mechanism is an inverted oil cylinder or air cylinder.

[0030] During granulation, sludge 13 is poured from the feed hopper and falls onto the topmost kneading granulation conveyor belt 6 from the bottom outlet of the feed hopper 7. The thickness of the sludge is controlled by the sludge thickness control plate 9. After the sludge covers the top layer of the topmost kneading granulation conveyor belt, the strip cutting device is started, and the strip cutting blade 11 is driven downward by the driving mechanism 12 to cut the sludge into equal parts. Subsequently, the sludge is kneaded and formed by the kneading and extrusion between the kneading granulation conveyor belt and the kneading arc surface and the kneading and extrusion of the kneading granulation channel in turn, and finally returns to flow through the vibrating conveyor belt and flows out from the discharge port. When transported on the vibrating conveyor belt, the sludge particles are dispersed by the vibration of the vibrator to avoid adhesion.

[0031] It is necessary to add that the coordinated work of each component is controlled by a control unit. This is a prior art and will not be described in detail here.

[0032] In summary, the sludge granulation device of this embodiment greatly improves the efficiency and uniformity of sludge granulation, which is beneficial to saving energy consumption.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A sludge granulation device, characterized in that: It comprises a shell (1), the top of which is provided with a feed hopper (7), the bottom of which is provided with a discharge port (14), at least two layers of kneading and granulating conveyor belts (6) and at least one layer of vibrating conveyor belt (2) are provided in the shell, the inner wall of the shell is processed with a kneading arc surface (5) at the position corresponding to the discharge end of each layer of kneading and granulating conveyor belt, a kneading and granulating channel is formed between adjacent kneading and granulating conveyor belts, and a vibrator (3) is installed on the inner side of the vibrating conveyor belt; a strip cutting device is provided on the top of the shell, the strip cutting device comprises a knife holder (10) which is sealed and slidably matched with the top of the shell, a driving mechanism (12) which drives the knife holder to move up and down, and a plurality of strip cutting blades (11) which are installed in parallel and at equal intervals at the bottom of the knife holder; The side wall of the feed hopper is provided with a sludge thickness control plate (9); The sludge thickness control plate is connected to the side wall of the feed hopper via a telescopic rod (8); The telescopic rod comprises a cylinder and a rod body which are slidably sleeved, and the cylinder and the rod body are slidably locked by a locking screw; The kneading arc surface (5) is concentrically matched with the end arc surface of the kneading granulation conveyor belt (6).

2. The sludge granulation device according to claim 1, characterized in that: The kneading and granulating conveyor belt is provided with a scraper (4).

3. The sludge granulation device according to claim 2, characterized in that: The scraper comprises a fixed plate body (41) and a movable plate body (42) which are sealed and slidably sleeved, and one end of the movable plate body (42) located inside the fixed plate body (41) is connected to the inner wall of the fixed plate body via a spring (43).

4. The sludge granulation device according to claim 3, characterized in that: The driving mechanism (12) is an inverted oil cylinder or a gas cylinder.

5. The sludge granulation device according to claim 1, characterized in that: The feed hopper (7) is nested with the shell (1).

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