Microalgae continuous harvesting system device

Abstract

The utility model discloses a continuous microalgae harvesting system device which comprises a disc centrifuge and a shaft type filter device, the disc centrifuge comprises an algae liquid inlet, a nutrient solution primary liquid outlet and an algae slurry outlet; the shaft type filtering device comprises an algae slurry inlet, a shaft type filter, a compressed air forward blowing port, a nutrient solution secondary drainage port, a compressed air reverse blowing port, a bottom collecting port and a bin gate; an algae slurry outlet of the disc centrifuge is connected and communicated with an algae slurry inlet of the shaft type filtering device through a pipeline; the shaft type filter is communicated with an external nutrient solution storage tank through a nutrient solution secondary liquid outlet; the compressed air back-flushing opening is communicated with the shaft type filter through the nutrient solution secondary drainage opening; the compressed air positive blowing opening is communicated with the interior of the shaft type filtering device; and a bottom collecting opening and a bin gate are arranged at the bottom of the shaft type filtering device. The water content of the material finally treated by the system device disclosed by the utility model is very low, and when the material is dried, the consumed energy consumption is low, the waste of water resources is small, and the hardware investment cost is low.

Description

Technical Field

[0001] This utility model belongs to the field of microalgae cultivation, and in particular relates to a microalgae continuous harvesting system device. Background Technology

[0002] Traditional microalgae harvesting devices primarily employ filtration and centrifugation methods. Filtration involves passing the algal solution through a filter medium to separate the microalgae cells from the culture medium. Centrifugation utilizes the powerful centrifugal force generated by the high-speed rotation of a drum to separate the microalgae cells from the culture medium.

[0003] Depending on the filtration mechanism, filtration operations are divided into clarification filtration and cake filtration.

[0004] In clarification filtration, the filter media used include diatomaceous earth, sand, granular activated carbon, glass beads, and plastic granules, which are filled into the filter to form the filter layer. Alternatively, shaped granular filter layers composed of sintered ceramics, sintered metals, bonded plastics, and tubes made of wound metal wires can be used. When the suspension passes through the filter layer, solid particles are blocked or adsorbed onto the particles in the filter layer, thus clarifying the filtrate. This method is suitable for the filtration and separation of suspensions with a solid content of less than 0.1 g / 100 ml and a particle diameter of 5–100 μm.

[0005] In cake filtration, the filter medium is filter cloth, including natural or synthetic fiber fabrics, metal fabrics, felt, asbestos boards, fiberglass paper, and non-woven fabrics made of synthetic fibers. Cake filtration can be classified into four types according to the driving force: gravity filtration, pressure filtration, vacuum filtration, and centrifugal filtration.

[0006] Centrifuges used in centrifugation are divided into tubular centrifuges and disc centrifuges. Existing tubular centrifuges typically consist of a body, transmission device, rotating drum, collection tray, and inlet bearing housing. The upper part of the rotating drum is a flexible main shaft, and the lower part is a damped floating bearing. The main shaft is connected to the driven wheel by a connecting seat buffer. The motor transmits power to the driven wheel via a conveyor belt and tension wheel, causing the drum to rotate at high speed around its own axis, creating a strong centrifugal force field. Material is injected through the bottom inlet, and the centrifugal force forces the liquid to move upwards along the inner wall of the drum, stratifying due to the density differences of different components. Tubular centrifuges are currently the ideal equipment for centrifugal separation, mainly used for liquid-solid, liquid-liquid, or liquid-liquid-solid three-phase separation. They can separate particles as small as 1 micrometer, and are particularly suitable for the extraction, concentration, and clarification of materials with small specific gravity differences between liquid and solid phases, fine solid particle size, low content, and highly corrosive media.

[0007] Disc centrifuges use annular valves to open and close the discharge port for intermittent slag discharge, also known as automatic slag discharge disc centrifuges. Their overall structure is similar to that of manual slag discharge disc centrifuges. During operation, a suspension is added through the feed pipe in the center of the drum for separation. The total pressure of the sealing water below the valve is greater than the total pressure of the suspension acting on the valve, keeping the valve in the upper position and the discharge port closed. During slag discharge, feeding is stopped, and operating water is added from the bottom of the drum. The sealing water pressure relief valve around the drum is opened, discharging the sealing water. The valve, under the pressure of the suspension inside the drum, rapidly descends, opening the discharge port. After the sediment and liquid inside the drum are discharged, the supply of operating water is stopped, the pressure relief valve closes, the sealing water pressure increases, and the valve rises to close the discharge port, completing one working cycle.

[0008] Because microalgae cultivation involves very high water content, if a filtration method (filter cake filtration) is used directly, continuous circulation filtration is required until a filter cake is built, which is very time-consuming.

[0009] Therefore, microalgae harvesting systems often employ centrifugation to harvest microalgae. Although tubular centrifuges have a high dehydration rate, they cannot process materials continuously and can only operate intermittently, limiting their application in large-scale production. Thus, in large-scale production, disc centrifuges are often used for continuous material processing, followed by spray drying. However, because disc centrifuges have a lower separation factor than tubular centrifuges and higher solid moisture content, they are essentially in a concentrated state. This results in high energy consumption in the subsequent spray dryer, and the water vapor generated during the drying process is difficult to collect, leading to significant water waste. Utility Model Content

[0010] The technical problem this invention aims to solve is to provide a continuous microalgae harvesting system. This system employs a two-stage harvesting process, thus reducing the number of discs and rotation speed within the first-stage disc centrifuge without affecting the final moisture content of the processed material. Because filtration consumes very little energy, the system is simple and has low hardware costs. By reducing the number of discs and rotation speed in the first-stage disc centrifuge, some of the water originally dehydrated by the centrifuge is transferred to filtration for removal, significantly reducing energy consumption and fixed asset investment throughout the harvesting process. The material ultimately processed by the entire harvesting system has very low moisture content, resulting in low energy consumption and minimal water waste during subsequent drying, further reducing hardware investment costs.

[0011] A microalgae continuous harvesting system includes a disc centrifuge and a shaft filter.

[0012] The disc centrifuge includes an algae liquid inlet, a primary nutrient solution outlet, and an algae slurry outlet.

[0013] The axial filtration device includes an algae slurry inlet, an axial filter, a compressed air forward blow port, a nutrient solution secondary drain port, a compressed air back blow port, a bottom collection port, and a chamber door;

[0014] The algae slurry outlet of the disc centrifuge is connected to the algae slurry inlet of the shaft filter via a pipe.

[0015] The shaft filter leads to an external nutrient solution storage tank through a secondary nutrient solution drain port.

[0016] The compressed air backflush port leads to the shaft filter through the secondary nutrient solution drain port;

[0017] The compressed air positive blow port is connected to the inside of the shaft-type filter device;

[0018] The bottom of the shaft-type filter device is equipped with a bottom collection port and a chamber door.

[0019] Preferably, the disc centrifuge mainly consists of three parts: a centrifuge housing, centrifuge discs, and a motor. The centrifuge housing is composed of an upper housing and a lower housing. An anti-vibration pad is provided at the connection between the upper and lower housings. The centrifuge housing can accommodate the rotation axis of the centrifuge discs. The centrifuge housing is made of stainless steel. The centrifuge discs are made of stainless steel. The centrifuge discs use a shell-shaped structure and a layered design. The motor is a three-phase asynchronous motor with variable frequency speed regulation.

[0020] Preferably, the axial filter comprises 3-8 filter blades.

[0021] Preferably, the bottom of the axial filter device is tapered and tightened.

[0022] Unless otherwise specified, all components or materials in this utility model can be obtained through commercial purchase, and the equipment used in this utility model can be conventional equipment in the relevant field or refer to existing technology in the relevant field.

[0023] Compared with the prior art, the present invention has the following beneficial effects. :

[0024] 1) Because this utility model device employs a two-stage harvesting process, reducing the number of discs and the rotation speed within the first-stage disc centrifuge does not affect the moisture content of the final processed material. Since filtration consumes very little energy, the device is simple and has low hardware costs. By reducing the number of discs and the rotation speed in the first-stage disc centrifuge, some of the water originally dehydrated by the centrifuge is transferred to the filtration process for removal. Therefore, energy consumption and fixed asset investment are significantly reduced throughout the harvesting process.

[0025] 2) The material processed by the entire harvesting system has a very low moisture content, so the energy consumption in the subsequent drying process is low, the water waste is small, and the hardware investment cost is significantly reduced. Attached Figure Description

[0026] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of the structure of a microalgae continuous harvesting system according to the present invention. Detailed Implementation

[0028] To more clearly illustrate this utility model, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive and should not be construed as limiting the scope of protection of this utility model.

[0029] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0030] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] See Figure 1 As shown, as one aspect of this utility model, a microalgae continuous harvesting system device includes a disc centrifuge 100 and a shaft filter device 200.

[0033] The disc centrifuge 100 includes an algae liquid inlet 1, a nutrient solution primary outlet 2, and an algae slurry outlet 3;

[0034] The axial filter device 200 includes an algae slurry inlet 4, a compressed air forward blow port 5, a nutrient solution secondary drain port 6, an axial filter 7, a compressed air back blow port 8, a bottom collection port, and a chamber door 9.

[0035] The algae slurry outlet 3 of the disc centrifuge 100 is connected to the algae slurry inlet 4 of the shaft filter device 200 via a pipe.

[0036] The shaft filter 7 is connected to an external nutrient solution storage tank (not shown in the figure) through the secondary nutrient solution drain port 6.

[0037] The compressed air backflush port 8 leads to the axial filter 7 through the secondary nutrient solution drain port 6; it can be understood that the axial filter 7 of this utility model can be a hollow structure, and the hollow cavity is connected to the secondary nutrient solution drain port 6 and the compressed air backflush port 8 through a pipe.

[0038] The compressed air positive blowing port 5 is connected to the inside of the shaft-type filter device 200;

[0039] The bottom of the shaft-type filter device 200 is provided with a bottom collection port and a chamber door 9.

[0040] According to certain embodiments of this utility model, the disc centrifuge mainly consists of three parts: a centrifuge shell, centrifuge discs, and a motor. The centrifuge shell is the most basic component of the disc centrifuge, consisting of an upper shell and a lower shell. An anti-vibration pad is provided at the connection between the upper and lower shells, which effectively reduces vibration and noise during machine operation. The centrifuge shell has a certain depth to accommodate the rotation axis of the centrifuge discs. The centrifuge shell is made of stainless steel to meet corrosion resistance and anti-corrosion requirements. The centrifuge discs are made of stainless steel and are characterized by corrosion resistance, acid and alkali resistance, and high temperature resistance. The centrifuge discs use a shell-shaped structure and a layered design. The centrifuge discs are the core part of the disc centrifuge, and their main function is to separate substances under high-speed centrifugal force to remove those that would have adverse effects on the fluid properties, achieving the purpose of concentration, separation, and purification. The motor is the power source of the disc centrifuge and is a three-phase asynchronous motor capable of frequency conversion speed regulation.

[0041] According to some embodiments of the present invention, the axial filter 7 includes four hollow filter blades.

[0042] According to certain embodiments of the present invention, the bottom of the axial filter device 200 is tapered and tightened.

[0043] The working principle of this microalgae continuous harvesting system is as follows:

[0044] The algal solution enters the disc centrifuge through algal solution inlet 1;

[0045] Under the centrifugal force generated by the high-speed rotation of the centrifuge, the microalgal cells in the algal solution undergo solid-liquid separation from the nutrient solution;

[0046] The working solution is collected after being discharged through the primary nutrient solution drain port 2;

[0047] Microalgae cells (actually algae slurry due to the use of a disc centrifuge) are transported from algae slurry outlet 3 to algae slurry inlet 4 under the action of strong centrifugal force and enter the shaft filter device;

[0048] Compressed air is delivered to the shaft filter device through the positive air inlet 5. Under the action of compressed air pressure, the algae slurry is adsorbed onto the shaft filter 7 and forms a filter cake, eventually forming an avalanche effect. The filter cake accumulates more and more, and only water can effectively pass through the filter cake and shaft filter 7, and is discharged and collected through the secondary nutrient solution outlet 6.

[0049] After a certain period of time (time control is used), the compressed air forward blow port 5 and the nutrient solution secondary drain port 6 are closed, and the compressed air reverse blow port 8 is opened;

[0050] Compressed air enters the shaft filter 7 through the backflush port 8 and blows the filter cake on the surface of the shaft filter 7 to the bottom of the filter device, and collects microalgae cells through the bottom collection port and the chamber door 9.

[0051] After a certain period of time, close the compressed air backflush port 8 and open the compressed air forward air port 5 and the nutrient solution secondary drain port 6, and repeat this process.

[0052] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is impossible to exhaustively list all possible implementations here. All obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A microalgae continuous harvesting system device, characterized in that, Including disc centrifuges and shaft filters; The disc centrifuge includes an algae liquid inlet, a primary nutrient solution outlet, and an algae slurry outlet. The axial filtration device includes an algae slurry inlet, an axial filter, a compressed air forward blow port, a nutrient solution secondary drain port, a compressed air back blow port, a bottom collection port, and a chamber door; The algae slurry outlet of the disc centrifuge is connected to the algae slurry inlet of the shaft filter via a pipe. The shaft filter leads to an external nutrient solution storage tank through a secondary nutrient solution drain port. The compressed air backflush port leads to the shaft filter through the secondary nutrient solution drain port; The compressed air positive blow port is connected to the inside of the shaft-type filter device; The bottom of the shaft-type filter device is equipped with a bottom collection port and a chamber door.

2. The microalgae continuous harvesting system device according to claim 1, characterized in that: The disc centrifuge mainly consists of three parts: the centrifuge housing, the centrifuge discs, and the motor. The centrifuge housing is composed of an upper housing and a lower housing. The connection between the upper and lower housings is equipped with a shock-absorbing pad. The centrifuge housing can accommodate the rotation axis of the centrifuge discs. The centrifuge casing is made of stainless steel; the centrifuge discs are made of stainless steel; the centrifuge discs use a shell-shaped structure and a layered design; the motor is a three-phase asynchronous motor with variable frequency speed control.

3. The microalgae continuous harvesting system device according to claim 1, characterized in that, The axial filter comprises 3-8 filter blades.

4. The microalgae continuous harvesting system device according to claim 1, characterized in that, The bottom of the axial filter device is tapered and tightened.

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