Slurry concentration structure

Abstract

The present invention relates to the field of slurry dewatering and concentration, and specifically disclosed is a slurry concentration structure. The slurry concentration structure comprises a dewatering cavity, wherein a slurry feeding port is formed in the top or side portion of the dewatering cavity; a slurry discharging port is formed in the bottom of the dewatering cavity; a dewatering assembly is arranged in the dewatering cavity; the dewatering assembly comprises a main driving shaft, a driving motor driving the main driving shaft, and dewatering units rotating along with the main driving shaft; each dewatering unit comprises a dewatering unit frame body, and a front filter screen and a rear filter screen which are matched with the frame body; a water collecting chamber is formed in each dewatering unit; and water in a slurry enters the water collecting chamber through the filter screens and is forced into the water collecting chambers by positive pressure. In the slurry concentration structure of the present invention, a dewatering assembly is arranged, positive-pressure dewatering is employed, and a high-pressure slurry enters a dewatering cavity and is outputted through a slurry discharging port, thereby implementing dewatering without affecting continuous output of the slurry; and by adjusting the slurry feeding / discharging rate and the sizes of a slurry feeding port and the slurry discharging port, adjustment of dewatering degree can be implemented.

Description

Slurry Concentration Structure Technical Field

[0001] This invention relates to the field of slurry concentration, and particularly to slurry concentration structures. Background Technology

[0002] In ceramics production, food processing, and the chemical industry, there are many processes that require spray granulation. This typically involves spraying a slurry and then drying it. During the spray granulation process, the slurry is sprayed into a spray tower where it is burned at high temperatures, removing moisture and turning into powder. Therefore, the amount of moisture that needs to be burned off determines the energy consumption of the spray tower. Theoretically, the lower the moisture content of the slurry, the less energy is required.

[0003] However, if the slurry moisture content is too low, the slurry will clump together, resulting in poor flowability and hindering transport and spraying. Therefore, the slurry is usually kept at a low solids content. However, this type of low solids content slurry is not conducive to energy saving, and the energy consumption for drying and granulation is relatively high.

[0004] Currently, there are some dewatering structures used to reduce the water content of slurry. However, most of these structures use negative pressure to extract water from the slurry. This method usually can only extract water in a single operation. It is necessary to keep the slurry being extracted from the current slurry from being transported, and to extract water in batches and collect the dewatered slurry. This is not conducive to continuous operation and makes it difficult to adjust the specific water content extracted. At the same time, negative pressure extraction will adsorb the slurry onto the filter media, and transporting the dewatered slurry requires an additional power structure.

[0005] The technical problem to be solved by this application is: how to provide a slurry concentration structure that is convenient for continuous operation and easy to adjust the dewatering ratio. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a slurry concentration structure that is convenient for continuous operation and easy to adjust the dewatering ratio.

[0007] The technical solution adopted in this invention is as follows:

[0008] The slurry concentration structure includes a dewatering chamber with a slurry inlet at the top or side and a slurry outlet at the bottom. A dewatering assembly is installed inside the chamber, comprising a main drive shaft, a drive motor for driving the main drive shaft, and a dewatering unit that rotates with the main drive shaft. The dewatering unit includes a dewatering unit frame and two front and rear filter screens that are fitted to the frame. A water collection chamber is formed inside the dewatering unit. Water in the slurry enters the water collection chamber through the filter screens. The water collection chamber is a low-pressure chamber, while the slurry entering through the inlet is high-pressure, causing the water collection chamber to become low-pressure, thus achieving a positive pressure dewatering structure. Water in the slurry is forced into the water collection chamber by positive pressure.

[0009] The slurry concentration structure of this invention, by setting up a dewatering component, adopts positive pressure dewatering. High-pressure slurry enters the dewatering chamber and is dewatered during the process of being output from the slurry outlet, without affecting the continuous output of slurry. Moreover, the degree of dewatering can be adjusted by adjusting the slurry inlet and outlet rates, as well as the size of the slurry inlet and outlet, which is very convenient.

[0010] In some embodiments, the dewatering unit frame is mounted to the main drive shaft via a main shaft frame. The main shaft frame includes mounting discs, and multiple mounting discs are positioned and mounted to the main drive shaft via positioning blocks. Each mounting disc has a mounting base, and a support rod is fixedly mounted on the mounting base. The dewatering unit frame is then mounted to the support rod. The main drive shaft drives the multiple mounting discs to rotate, which, while achieving dewatering, also agitates the slurry within the dewatering chamber. This results in a more uniform dewatering effect, prevents coagulation caused by localized dewatering, and, in conjunction with a scraper, scrapes the slurry to prevent it from sticking to the dewatering unit.

[0011] In some implementations, a water pipe is installed on the main drive shaft, and a water outlet is installed in the water collection chamber of the dewatering unit. The water outlet is connected to the water pipe, and the other end of the water pipe is configured as a drain outlet. Multiple water pipes are installed to correspond to different dewatering units for centralized drainage.

[0012] In some embodiments, a chamber frame is provided inside the dewatering chamber, and a scraper frame is provided on the chamber frame. The scraper frame is provided with multiple scrapers, which are close to the filter screen and have gaps between them. By setting up the scrapers, the slurry is scraped during the rotation of the dewatering unit, preventing the slurry from sticking entirely to the filter screen.

[0013] In some implementations, multiple water pipes are installed, and these pipes are connected to the drain outlets. The use of multiple water pipes facilitates water circuit layout and allows for individual connection to different water collection chambers.

[0014] In some implementations, the drain outlet is equipped with a backflushing device, which can be used to backflush the filter screen with backflushing water. The backflushing device enables backflushing of water, effectively preventing clogging of the dewatering unit and ensuring continuous dewatering performance.

[0015] In some implementations, the backwashing device is a backwash valve. By setting a backwash valve, backwashing is achieved on the filter screen, effectively improving the filter screen's lifespan and ensuring continuous dewatering operation.

[0016] In some embodiments, the high-pressure slurry is driven by a high-pressure pump and enters the dewatering chamber from the slurry inlet. By using a high-pressure pump to inject the high-pressure slurry, the pressure inside the dewatering chamber is ensured to be higher than that in the water collection chamber, enabling continuous dewatering and concentration of the slurry. Furthermore, the pressure inside the dewatering chamber is also higher than that in the subsequent feeding pipe connected to the slurry outlet, effectively assisting subsequent slurry transportation and eliminating the need for a separate power unit for subsequent slurry transportation.

[0017] The beneficial effects of this invention are as follows:

[0018] This slurry thickening structure drives a dewatering unit via a main drive shaft. The dewatering unit is covered with a filter screen, and the water in the high-pressure slurry passes through the filter screen into the dewatering unit for dewatering. This dewatering method relies on positive pressure and does not affect the continued transport of the slurry. At the same time, by adjusting the ratio of the slurry inlet and outlet sizes and the slurry transmission speed, the pressure difference and residence time of the slurry in the dewatering chamber can be controlled. The pressure difference and residence time determine the amount of water removed from the slurry, thus controlling the water content of the discharged slurry. Furthermore, the high-pressure entry of the slurry not only completes dewatering but also provides power for subsequent transport, saving the cost of adding a conveying device later. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the overall structure of the dehydration structure of the present invention;

[0020] Figure 2 is a schematic diagram of the dehydration chamber of the present invention;

[0021] Figure 3 is a schematic diagram of the dehydration component of the present invention;

[0022] Figure 4 is a schematic diagram of the structure of the dehydration unit frame in Figure 3;

[0023] Figure 5 is a schematic diagram of the dehydration unit of the present invention;

[0024] Figure 6 is a schematic diagram of the scraper frame of the present invention;

[0025] Figure 7 is a schematic diagram of the recoil device of the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please refer to Figures 1-7. This invention provides a technical solution:

[0028] As shown in Figure 1, the slurry concentration structure includes a dewatering chamber 1, a slurry inlet 2 at the top of the dewatering chamber 1, a slurry outlet 3 at the bottom of the dewatering chamber 1, and a dewatering assembly 4 inside the dewatering chamber 1. High-pressure slurry enters the dewatering chamber through the slurry inlet 2, is dewatered by the dewatering assembly 4, and is then output from the slurry outlet 3. The slurry outlet 3 is equipped with a control valve to control the slurry discharge speed.

[0029] As shown in Figure 3, the dehydration assembly 4 includes a main drive shaft 41, a drive motor 42 that drives the main drive shaft 41, and a dehydration unit 5 that rotates with the main drive shaft 41. In this embodiment, the dehydration chamber 1 is provided with multiple dehydration discs, and each dehydration disc is provided with six dehydration units 5. The six dehydration units 5 are spliced ​​into a circle with the main drive shaft 41 as the center.

[0030] As shown in Figure 5, the dewatering unit 5 includes a dewatering unit frame 51 and front and rear filter screens 52 that are installed in conjunction with the dewatering unit frame 51. The dewatering unit 5 forms a water collection chamber 53 through the front and rear filter screens 52 and the dewatering unit frame 51. The slurry entering through the slurry inlet 2 is high-pressure slurry. The pressure inside the water collection chamber 53 is lower than that of the slurry. The water in the slurry is squeezed into the water collection chamber 53 by positive pressure. The water entering the water collection chamber 53 is discharged through the water outlet 54.

[0031] Several water pipes 7 are installed on the main drive shaft 41. Each water pipe 7 has multiple water inlets, and each water inlet corresponds to the water outlet 54 of a dehydration unit 5. The water outlet 54 is connected to the water pipe 7, and the other end of the water pipe 7 is set as a drain outlet 71.

[0032] As shown in Figures 2 and 4, the dewatering unit frame 51 is installed on the main drive shaft 41 via the main shaft frame 6. The main shaft frame 6 includes a mounting plate 61. Multiple mounting plates 61 are positioned and installed on the main drive shaft 41. Mounting seats 63 are provided on the mounting plates 61. Support rods 64 are fixedly installed on the mounting seats 63. The dewatering unit frame 51 is installed in conjunction with the support rods 64.

[0033] As shown in Figure 6, a cavity frame 8 is provided inside the dewatering cavity 1. A scraper frame 81 is provided on the cavity frame 8. Multiple scrapers 82 are provided on the scraper frame 81. The scrapers 82 are close to the filter screen 52 and have gaps. During the rotation of the dewatering unit 5 with the main drive shaft 41, the scrapers 82 remain stationary. Therefore, the filter screen 52 moves relative to the scrapers 82. The scrapers 82 scrape the surface of the filter screen 52 to remove the slurry adhering to the filter screen 52 and prevent clogging.

[0034] The number and density of scrapers 82 are set according to the rotation speed of the main drive shaft 41 to ensure that the slurry on the filter screen 52 is scraped off in time to prevent coagulation and hardening.

[0035] Meanwhile, the gap between the scraper 82 and the filter screen 52 is set at 0.5mm-5mm. The gap is set according to the material of the filter screen 52 to ensure that the scraper 82 will not scratch the filter screen 52 while scraping off more slurry. The scraper 82 does not directly contact the filter screen 52, which can greatly improve the service life of the filter screen 52.

[0036] The drain outlet 71 is equipped with a backwash device 9, which is a backwash valve. The backwash device 9 can be used to flush the filter screen 52 with backwash water to prevent the filter screen 52 from clogging and to facilitate the continuous operation of the dewatering device.

[0037] The high-pressure slurry is driven by a high-pressure pump and enters the dewatering chamber 1 from the slurry inlet 2 to ensure a high-pressure environment inside the dewatering chamber 1. The slurry outlet 3 is subsequently connected to a pipeline for transportation. Through the high-pressure output of the high-pressure pump, continuous dewatering is achieved and the power for subsequent pipeline transportation can be effectively provided.

[0038] The working principle and usage process of this invention: High-pressure slurry is fed into the dewatering chamber 1 from the slurry inlet 2. At this time, the slurry outlet 3 is closed by the control of the solenoid valve. The slurry accumulates and fills in the dewatering chamber 1 until it overflows to the dewatering unit frame 51. The drive motor 42 drives the main drive shaft 41 to rotate, which in turn drives the dewatering unit frame 51 to rotate. Since the pressure inside the water collection chamber 53 in the dewatering unit frame 51 is lower than that outside, the water in the slurry enters the water collection chamber 53 through the filter screen 52 to achieve dewatering. The dewatered slurry is output from the slurry outlet 3 below to other processes.

[0039] The amount of water removed depends on the original moisture content of the slurry, the pressure difference, the dewatering time, the filterability of the filter media, and the effective filtration area. The opening and closing control of the solenoid valve at the slurry outlet 3 determines the slurry discharge speed. Several specific embodiments are listed below to facilitate understanding of the specific settings of this application.

[0040] Example 1

[0041] This embodiment targets ceramic slurry. In this embodiment, commercially available ceramic slurry is pressurized and input through the slurry inlet 2 via a plunger pump. The water content of commercially available ceramic slurry is usually 33-40%. The filter screen set in this embodiment is made of non-woven filter fabric. Through the concentration structure of this embodiment, the plunger pump is used as a high-pressure delivery pump to dehydrate the slurry by 3 to 20 points, resulting in a slurry with a water content of 20% to 30%, which is convenient for subsequent use. The dehydration rate can also be adjusted according to the requirements of the subsequent spray tower structure. At the same time, the slurry outlet 3 is connected to the delivery pipeline, which delivers the slurry to the spray tower. Due to the high pressure in the dehydration chamber 1, the delivery pipeline does not need to be equipped with any other power device to realize the fluid transportation of the slurry.

[0042] Example 2

[0043] This embodiment targets the food processing field, concentrating sweet potato slurry. Typically, the sweet potato slurry to be filtered has a water content of 90% to 95%. Through the dehydration structure of this embodiment, the slurry can be dehydrated to obtain sweet potato slurry with a water content of 15% to 20%. At the same time, a water circulation device is set at the drain outlet 71. While dehydrating the sweet potato slurry, the dehydrated liquid contains a certain amount of starch. By setting up the water circulation device, this dehydrated liquid can be recycled back into the preparation of sweet potato slurry.

[0044] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A slurry concentration structure, comprising a dewatering chamber (1), wherein the dewatering chamber (1) has a slurry inlet (2) at its top or side, a slurry outlet (3) at its bottom, and a dewatering assembly (4) is provided inside the dewatering chamber (1), characterized in that, The dewatering assembly (4) includes a main drive shaft (41), a drive motor (42) that drives the main drive shaft (41), and a dewatering unit (5) that rotates with the main drive shaft (41). The dewatering unit (5) includes a dewatering unit frame (51) and front and rear filter screens (52) that are installed in conjunction with the dewatering unit frame (51). The dewatering unit (5) forms a water collection chamber (53) through the filter screens (52) and the dewatering unit frame (51). The slurry entering through the slurry inlet (2) is a high-pressure slurry, which makes the water collection chamber (53) become low-pressure, realizing positive pressure dewatering. The water in the slurry is squeezed into the water collection chamber (53) by positive pressure. The dewatering unit frame (51) is installed on the main drive shaft (41) via the main shaft frame (6). The main shaft frame (6) includes a mounting plate (61). Multiple mounting plates (61) are positioned and installed on the main drive shaft (41). A mounting seat (63) is provided on the mounting plate (61). A support rod (64) is fixedly installed on the mounting seat (63). The dewatering unit frame (51) is installed in conjunction with the support rod (64). The high-pressure slurry is driven by a high-pressure pump and enters the dewatering chamber (1) from the slurry inlet (2).

2. The slurry concentration structure according to claim 1, characterized in that, A water pipe (7) is provided on the main drive shaft (41), and a water outlet (54) is provided in the water collection chamber (53) of the dehydration unit (5). The water outlet (54) is connected to the water pipe (7), and the other end of the water pipe (7) is provided as a drain outlet (71).

3. The slurry concentration structure according to claim 1, characterized in that, The dehydration chamber (1) is provided with a chamber frame (8), and a scraper frame (81) is provided on the chamber frame (8). Multiple scrapers (82) are provided on the scraper frame (81), and the scrapers (82) are close to the filter screen (52) and have gaps.

4. The slurry concentration structure according to claim 2, characterized in that, Multiple water pipes (7) are provided, and the multiple water pipes are connected to the drain outlet (71).

5. The slurry concentration structure according to claim 2, characterized in that, The drain outlet is equipped with a backwash device (9), which can be used to backwash water flow to flush the filter screen (52). 6.6 The slurry concentration structure according to claim 5 is characterized in that, The backflush device (9) is a backflush valve.

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