Compound algal pulp multi-flow state drying device

Abstract

The application discloses a composite algal pulp multi-flow-state drying device and relates to the technical field of algal treatment equipment. The device comprises a filter cartridge, which is composed of an upper cylinder and a lower cylinder arranged below the upper cylinder. Filter holes are formed in the upper cylinder and the lower cylinder. A circular air supporting piece is arranged on the inner wall surface of the lower cylinder. A vibrator is arranged on the lower cylinder. A hot air flow uniform evaporation hose is arranged in the filter cartridge. In the filtering stage, the air supporting piece inputs gas between the bottom of the filter bag and the wall surface of the lower cylinder, so that an air cushion is formed between the bottom of the filter bag and the wall surface of the lower cylinder, the filter bag is prevented from adhering to the wall, the annular overflow gap is maintained, the loss of the filtering area and the blockage of the flow channel can be effectively avoided, the gel bridge can be destroyed by the impact force generated by the disturbing piece, the filtering efficiency is improved, and the filter cartridge is filled with hot air by the drying piece for further drying treatment.

Description

Technical Field

[0001] This invention relates to the field of algae treatment technology, specifically a composite algae slurry multi-flow drying device. Background Technology

[0002] After collection, algae need to be dried to facilitate subsequent transportation and further processing. Traditional processing technology is usually divided into two independent stages: mechanical filtration and thermal drying. First, the water content of the algae slurry is reduced from more than 99% to 75% to 85% by centrifugation, pressure filtration and other methods. Then, the water content is further reduced to 15% to 30% by hot air, drum or spray drying and other methods.

[0003] The existing technology has the following shortcomings: First, during the filtration stage, the extracellular polymers of algae easily form a dense gel layer, which clogs the filter pores, leading to a sharp increase in filtration resistance and a decrease in efficiency. Second, simple mechanical dehydration is difficult to remove capillary-bound water and adsorbed water, resulting in high water content. Third, the split-type process is lengthy, and multiple material transfers increase energy consumption and pollution risks. Fourth, traditional hot air drying easily leads to material caking, uneven heating, and low drying efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a composite algae slurry multi-flow drying device to solve the problems of low filtration efficiency caused by easy clogging of the filter screen, high water content caused by the filtration method, and low drying efficiency of traditional drying methods in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a composite algal slurry multi-fluidic drying device, comprising a filter cylinder, wherein the filter cylinder is composed of an upper cylinder and a lower cylinder disposed below the upper cylinder, both the upper and lower cylinders are provided with filter holes, a filter bag is placed inside the filter cylinder, an air support is provided inside the lower cylinder, a disturbance component is provided on the lower cylinder, and a drying component is provided inside the filter bag.

[0006] When it is necessary to dry the algae slurry, a filter bag is placed inside the filter cartridge, and then the algae slurry is fed into the filter bag. At this time, the excess water in the algae slurry is filtered out from the filter bag and discharged from the filter holes, reducing the free water content in the algae slurry and achieving filtration and concentration. As filtration continues, the filter bag will stick to the inner wall of the filter cartridge, reducing the effective filtration area and making it difficult to remove the filter bag due to its sticking to the wall. During filtration and concentration, gas is introduced between the bottom of the filter bag and the lower cylinder wall through the air support component during the filtration stage. This creates an air cushion between the bottom of the filter bag and the lower cylinder wall, slightly lifting the filter bag and preventing it from sticking to the wall. Maintaining an annular flow gap effectively avoids the loss of effective filtration area and flow channel blockage caused by the filter bag sticking to the wall, thus improving filtration efficiency.

[0007] As a preferred technical solution, the wall surface of the upper cylinder is star-shaped pleats.

[0008] During filtration, the filter bag adheres to the inner wall of the upper cylinder due to the compression of the algae slurry. Therefore, the inner surface area of ​​the upper cylinder is the filtration area. Traditional algae slurry treatment equipment is mostly cylindrical. The wall of the upper cylinder is set with star-shaped pleats, which can increase the filtration area by 150% and effectively improve the filtration efficiency.

[0009] As a preferred technical solution, the lower cylinder is conical, and the larger end of the cone is connected to the bottom of the upper cylinder.

[0010] As a preferred technical solution, the cone angle of the lower cylinder is 65° to 78°.

[0011] Regarding the condensation time: When the cone angle is 65°, compared with a steep cone of 45°, the slope of the cylinder is softened, the intensity of fluid rising turbulence is significantly reduced, and the risk of bottom blockage is eliminated; the concentration time per batch can be reduced by more than 58% compared with a 45° cone, and the phenomenon of overflow carrying fine algae particles is greatly reduced; When the cone angle is 78°, compared with the 90° gentle cone, the inclination of the cylinder wall is increased, which effectively improves the problem of algae and mud adhering to the wall. The settling cycle is shortened by 24% compared with the 90° cone, the amount of blue-green algae adhering to the cylinder wall is significantly reduced, and the integrity of material collection is greatly improved.

[0012] Regarding concentration ratio: When the cone angle is 45°, the bottom outlet is easily blocked due to strong upward turbulence, and the overflow carries a serious amount of fine algae particles. The algae slurry concentration ratio is only 75% to 76% of the suitable cone angle range of 65° to 78°. When the cone angle is 90°, the cylinder wall slope is gentle, resulting in prominent problems of algal mud sticking to the wall and blue-green algae adhering to the cylinder wall. Material collection is incomplete, and the algal slurry concentration ratio is only 84%-85% of the suitable cone angle range of 65° to 78°. The concentration ratio within the suitable range of 65°–78° is 48:1–50:1, and the residual algae in the effluent is controlled below 8 mg / L. Overall, this can further improve dehydration efficiency.

[0013] As a preferred technical solution, the disturbance component is a vibrator, which is installed on the lower cylinder and has both low-frequency and high-frequency states.

[0014] As a preferred technical solution, the low-frequency range of the vibrator is 3 to 15 Hz, and the high-frequency range of the vibrator is 50 to 100 Hz.

[0015] Alternating vibrations of 3-15Hz low frequency and 50-100Hz high frequency are used: the low frequency is responsible for breaking up algal flocs and removing capillary water, while the high frequency is responsible for stripping water bound to the algal surface. The two work together to achieve efficient dehydration.

[0016] When the frequency is below 3 Hz, the disturbance is insufficient, the algae flocs are difficult to disperse, the filter cake quickly clumps together, and the bound water inside cannot be released; when the frequency is above 15 Hz, the algae mud will be compacted, forming a dense colloid that clogs the filter pores, reducing the solid residue recovery rate, and exacerbating the impact fatigue of the equipment.

[0017] High frequencies below 50 Hz have insufficient excitation energy and cannot effectively remove bound water from algae, resulting in a significant reduction in deep dehydration. High frequencies above 100 Hz will cause a large number of algal cells to rupture, leading to the leakage of organic matter, increased viscosity of the filtrate, blockage of the filter pores, and overheating damage to the vibrating components, thus shortening the service life of the filter cloth and the entire machine.

[0018] Within this vibration range, low and high frequencies alternate, and the measured water content of the algal mud is between 89.4% and 89.7%.

[0019] As a preferred technical solution, the drying component adopts a hot airflow uniform steaming hose, which is installed inside the filter bag.

[0020] As a preferred technical solution, the weight of the hot airflow uniform steaming hose is greater than the jet buoyancy.

[0021] After filtration and concentration, the water content of the algae slurry often does not meet the requirements. At this time, hot air can be introduced into the filter cartridge for further drying. The hot air flow uniform evaporation hose is connected to a hot air source and has micropores. After the filtration and concentration stage is completed, the water content of the algae slurry can no longer be reduced, but the algae slurry has not yet reached the drying standard. At this time, the hot air uniform steaming hose is placed into the algae slurry from the top of the filter cylinder. The weight of the hot air uniform steaming hose itself allows the hot air uniform steaming hose to sink to the bottom of the algae slurry. At the same time, hot air is injected into the algae slurry through the hot air uniform steaming hose. The hot air is evenly sprayed out through the micropores of the flexible tube wall to dry the algae. Hot air is always sprayed out when the hot air uniform steaming hose enters the algae slurry, which can effectively avoid the problem of pore blockage. Because the weight of the hot air jet uniform evaporation hose is greater than the buoyancy of the air jet, it can sink on its own after being placed in the filter cartridge, making operation simple. Meanwhile, during the drying process, the hot airflow uniform steaming hose is accompanied by the vibration of the algae slurry. The vibration throws the algae into the air → the hot air dries and exposes the surface → the algae rolls back into place → the new surface is exposed again, realizing the fluidized drying of the algae slurry. This allows for all-round and uniform drying of the algae, improving drying efficiency and preventing crust formation.

[0022] Compared with the prior art, the beneficial effects of the present invention are: 1. An air cushion is formed between the bottom of the filter bag and the lower cylinder wall by the air support component, which slightly lifts the filter bag to prevent it from sticking to the wall. This maintains an annular flow gap to avoid loss of effective filtration area and blockage of the flow channel caused by the filter bag sticking to the wall, thereby improving filtration efficiency.

[0023] 2. A vibrator is used to break down the gel bridge and create cracks in the filter cake, reducing filtration resistance and increasing dehydration rate. The high-frequency mode reduces the viscosity of the algae slurry through shear thinning, promotes the movement of water molecules, and facilitates the rapid discharge of free water, thus achieving rapid filtration and concentration of the algae slurry.

[0024] 3. Hot air is injected into the algae slurry through a hot air flow uniform steaming hose. The hot air is sprayed out through the micropores of the flexible tube wall to dry the algae. The hot air flow uniform steaming hose always sprays out hot air when it enters the algae slurry, which can effectively avoid the problem of pore blockage and improve the drying efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the second embodiment of the present invention; Figure 3 For the present invention Figure 2 Another structural diagram from a different perspective; Figure 4 For the present invention Figure 2 A cross-sectional view of the structure shown; Figure 5 This is a schematic diagram of the upper cylinder structure in the second embodiment of the present invention. Figure 6 This is a schematic diagram of the first structure according to the third embodiment of the present invention; Figure 7 This is a schematic diagram of the second structure of the third embodiment of the present invention; Figure 8 For the present invention Figure 5 A cross-sectional view of the structure shown; Figure 9 This is a cross-sectional schematic diagram of the filter bag of the present invention.

[0026] In the diagram: 1. Upper cylinder; 2. Lower cylinder; 3. Air support; 4. Vibrator; 5. Hot air flow uniform evaporation hose; 6. Filter bag. Detailed Implementation

[0027] 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.

[0028] Example 1: As Figures 1-9As shown, the composite algae slurry multi-fluid state drying device includes a filter cylinder, which consists of an upper cylinder 1 and a lower cylinder 2 located below the upper cylinder 1. Filter holes are provided on both the upper cylinder 1 and the lower cylinder 2. A filter bag 6 is placed inside the filter cylinder, and an air support 3 is provided inside the lower cylinder 2.

[0029] The wall surface of the upper cylinder 1 is a smooth wall surface.

[0030] The lower cylinder 2 is a straight cylindrical shape.

[0031] When the algae slurry needs to be dried, filter bag 6 is placed in the filter cartridge, and then algae slurry is fed into filter bag 6. At this time, the excess water in the algae slurry is filtered out from filter bag 6 and discharged from the filter holes, reducing the content of free water in the algae slurry and achieving filtration and concentration. As filtration proceeds, the filter bag 6 will adhere to the inner wall of the filter cartridge, reducing the effective filtration area and making it difficult to remove the filter bag 6 due to its adherence to the wall. During filtration and concentration, gas is introduced into the space between the bottom of the filter bag 6 and the wall of the lower cylinder 2 through the air support 3 during the filtration stage. This creates an air cushion between the bottom of the filter bag 6 and the wall of the lower cylinder 2, slightly lifting the filter bag 6 and preventing it from sticking to the wall. This maintains an annular flow gap, effectively avoiding the loss of effective filtration area and flow channel blockage caused by the filter bag 6 sticking to the wall, thus improving filtration efficiency.

[0032] The disturbance component is a vibrator, which is installed on the lower cylinder 2. The vibrator 4 has two states: low frequency and high frequency.

[0033] In addition to algal cells, algal slurry also contains a large number of extracellular polymers, which are a kind of viscous gel-like substance. During the filtration and concentration process, these gel substances will bind the substances in the algal slurry together to form a gel framework, making the filter cake layer dense and impermeable to water. These gel frameworks can be destroyed by tapping to generate impact force. Vibrator 4 is used to achieve vibration during algae slurry filtration. The low-frequency mode can simulate intermittent knocking, destroy the gel bridge and create cracks in the filter cake, reduce filtration resistance and improve dehydration rate. The high-frequency mode reduces the viscosity of algae slurry through shear thinning, promotes the movement of water molecules, promotes the rapid discharge of free water, and achieves rapid filtration and concentration of algae slurry. The two modes can be operated independently or alternately according to a set time sequence to avoid the "shearing thickening" caking phenomenon caused by single-frequency vibration in the later stage of algae slurry dewatering. The combination of low-frequency vibration and high-frequency vibration can be applied to the filtration of algae slurry with different stages and different water contents, effectively improving the filtration and concentration efficiency.

[0034] The low-frequency range of vibrator 4 is 3 to 15 Hz, and the high-frequency range of vibrator 4 is 50 to 100 Hz.

[0035] Alternating vibrations of 3–15 Hz low frequency and 50–100 Hz high frequency are used: the low frequency is responsible for breaking up algal flocs and removing capillary-encapsulated water, while the high frequency is responsible for stripping bound water from the algal surface. The two work together to achieve efficient dehydration.

[0036] When the frequency is below 3 Hz, the disturbance is insufficient, the algae flocs are difficult to disperse, the filter cake quickly clumps together, and the bound water inside cannot be released; when the frequency is above 15 Hz, the algae mud will be compacted, forming a dense colloid that clogs the filter pores, reducing the solid residue recovery rate, and at the same time aggravating the impact fatigue of the equipment.

[0037] High frequencies below 50 Hz have insufficient excitation energy and cannot effectively remove bound water from algae, resulting in a significant reduction in deep dehydration. High frequencies above 100 Hz will cause a large number of algal cells to rupture, leading to the leakage of organic matter, increased viscosity of the filtrate, blockage of the filter pores, and overheating damage to the vibrating components, thus shortening the service life of the filter cloth and the entire machine.

[0038] Within this vibration range, low and high frequencies alternate, and the measured water content of the algal mud is between 89.4% and 89.7%.

[0039] The drying component uses a hot airflow uniform steaming hose 5, which is installed inside the filter bag 6.

[0040] The weight of the hot airflow uniform steaming hose 5 is greater than the jet buoyancy.

[0041] After filtration and concentration, the water content of the algae slurry often does not meet the requirements. At this time, hot air can be introduced into the filter cartridge for further drying. The hot air flow uniform evaporation hose 5 is connected to a hot air source, and micropores are opened on the hot air flow uniform evaporation hose 5. After the filtration and concentration stage is completed, the water content of the algae slurry can no longer be reduced, but the algae slurry has not yet reached the drying standard. At this time, the hot air uniform steaming hose 5 is placed into the algae slurry from the top of the filter cylinder. The weight of the hot air uniform steaming hose 5 itself allows it to sink to the bottom of the algae slurry. At the same time, hot air is injected into the algae slurry through the hot air uniform steaming hose 5. The hot air is sprayed out through the micropores of the flexible tube wall to dry the algae. Hot air is always sprayed out when the hot air uniform steaming hose 5 enters the algae slurry, which can effectively avoid the problem of pore blockage. Since the weight of the hot airflow uniform evaporation hose 5 is greater than the buoyancy of the air jet, it can sink on its own after being placed in the filter cartridge, making operation simple. Meanwhile, during the drying process, the hot airflow uniform steaming hose 5 is accompanied by the vibration of the vibrator 4, which disturbs the algae slurry. The vibration throws the algae into the air → the hot air dries and exposes the surface → the algae rolls back into place → the new surface is exposed again, thus achieving fluidized drying of the algae slurry. This allows for all-round and uniform drying of the algae, improving drying efficiency and preventing crust formation.

[0042] Example 2: Figures 2-6 and Figure 8 As shown; The difference between this embodiment and Embodiment 1 is that the wall surface of the upper cylinder 1 is star-shaped pleats.

[0043] During filtration, the filter bag 6 adheres to the inner wall of the upper cylinder 1 due to the compression of the algae slurry. Therefore, the inner surface area of ​​the upper cylinder 1 is the filtration area. Traditional algae slurry treatment equipment is mostly cylindrical. In this embodiment, the wall of the upper cylinder 1 is set as a star-shaped pleat, which can increase the filtration area by 150% and effectively improve the filtration efficiency.

[0044] Example 3: Figures 6-8 As shown The difference between this embodiment and Embodiments 1 and 2 is that the lower cylinder 2 is conical, and the larger end of the cone is connected to the bottom of the upper cylinder 1.

[0045] The lower cylinder 2 is conical. The algae slurry inside the cone decomposes along the cone surface to generate normal pressing force, thereby achieving further dewatering of the algae slurry. As filtration proceeds, the filter cake becomes thicker and heavier, and the pressing force increases accordingly, forming a positive feedback. The structure is simple, requires no additional drive device, and can effectively improve dewatering efficiency. Example

[0046] The difference between this embodiment and embodiment three is that the cone angle of the lower cylinder 2 is greater than or equal to 65°.

[0047] When setting the cone angle, the standard cone angle is 45° to 90°. When the cone angle is small, the upward turbulence of the fluid is obvious, which can easily cause blockage at the bottom and reduce the concentration rate of algae slurry. When the cone angle is 65°, compared with 45°, the intensity of the upward turbulence of the fluid is significantly reduced, eliminating the risk of blockage at the bottom. The concentration time per batch can be reduced by more than 58% compared with the time of a 45° cone. Example

[0048] The difference between this embodiment and embodiment three is that the cone angle of the lower cylinder 2 is less than or equal to 78°.

[0049] When the cone angle is large, the inclination of the cylinder wall is insufficient, and algae mud is prone to sticking to the wall, affecting the integrity of material collection. When the cone angle is 78°, the inclination of the cylinder wall increases, effectively improving the problem of algae mud sticking to the wall. The settling period is shortened by 24% compared with the 90° cone, the amount of blue-green algae adhering to the cylinder wall is significantly reduced, and the integrity of material collection is greatly improved. Example

[0050] The difference between this embodiment and embodiment three is that the cone angle of the lower cylinder 2 is 65° to 78°.

[0051] The cone angle of the cylinder 2 is set at 65° to 78°, which can simultaneously reduce the impact of fluid rise turbulence and algae sludge adhesion to the wall, while shortening the concentration time, improving the integrity of material collection, increasing the concentration ratio of algae slurry, and enhancing the treatment effect.

[0052] Comparative Example 1: When the cone angle is 45°, the bottom outlet is easily blocked due to strong upward turbulence, and the overflow carries a lot of fine algae particles. The algae slurry concentration ratio is only 75%-76% when the cone angle is 65° to 78°.

[0053] Comparative Example 2: When the cone angle is 90°, the slope of the cylinder wall is gentle, and the problems of algae mud sticking to the wall and blue-green algae adhering to the cylinder wall are prominent. The material collection is incomplete, and the algae slurry concentration ratio is only 84% to 85% when the cone angle is 65° to 78°.

[0054] Working principle of the invention: After the algae slurry is added to the filter cartridge, the excess water is discharged through the filter screen and the filter holes on the filter cartridge. The air support 3 introduces gas between the bottom of the filter bag 6 and the wall of the lower cylinder 2, so that an air cushion is formed between the bottom of the filter bag 6 and the wall of the lower cylinder 2, maintaining an annular flow gap, which can effectively prevent the filter bag 6 from sticking to the wall, resulting in loss of effective filtration area and blockage of the flow channel. At the same time, the vibrator 4 generates an impact force to break the gel bridge in the algae slurry, thereby improving the filtration efficiency. In conjunction with the hot airflow uniform evaporation hose 5, the concentrated algae slurry is further dehydrated. The combination of the two can also achieve all-round and uniform drying of the algae material, improve drying efficiency, and prevent crust formation.

[0055] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A composite algal slurry multi-flow drying device, comprising a filter cartridge, the filter cartridge consisting of an upper cylinder (1) and a lower cylinder (2) disposed below the upper cylinder (1), both the upper cylinder (1) and the lower cylinder (2) having filter holes, and a filter bag (6) placed inside the filter cartridge, characterized in that: An air support (3) is provided inside the lower cylinder (2), a disturbance component is provided on the lower cylinder (2), and a drying component is provided inside the filter bag (6).

2. The composite algal slurry multi-flow drying device according to claim 1, characterized in that: The wall surface of the upper cylinder (1) is a smooth wall surface.

3. The composite algal slurry multi-flow drying device according to claim 1, characterized in that: The wall of the upper cylinder (1) is star-shaped folds.

4. The composite algal slurry multi-flow drying device according to any one of claims 1-3, characterized in that: The lower cylinder (2) is a straight cylindrical shape.

5. The composite algal slurry multi-fluidic drying device according to any one of claims 1-3, characterized in that: The lower cylinder (2) is conical, and the larger end of the cone is connected to the bottom of the upper cylinder (1).

6. The composite algal slurry multi-flow drying device according to claim 5, characterized in that: The cone angle of the lower cylinder (2) is 65° to 78°.

7. The composite algal slurry multi-flow drying device according to any one of claims 1-3, characterized in that: The disturbance component is a vibrator (4), which is installed on the lower cylinder (2). The vibrator (4) has two states: low frequency and high frequency.

8. The composite algal slurry multi-flow drying device according to claim 7, characterized in that: The low-frequency range of the vibrator (4) is 3 to 15 Hz, and the high-frequency range of the vibrator (4) is 50 to 100 Hz.

9. The composite algal slurry multi-flow drying device according to any one of claims 1-3, characterized in that: The drying component uses a hot airflow uniform steaming hose (5), which is installed inside the filter bag.

10. The composite algal slurry multi-flow drying device according to claim 9, characterized in that: The weight of the hot airflow uniform steaming hose (5) is greater than the jet buoyancy.

Images