A micro-reaction device for extracting algal oil

Abstract

The application discloses a kind of micro-reaction devices for extracting algal oil, comprising sequentially arranged solid-liquid microextractor, DME gasification chamber and micro water-oil separation device, solid-liquid microextractor includes upper layer center shaft, the peripheral wall of upper layer center shaft is provided with a plurality of mixing structures, the mixing structure is composed of DME mixing layer, extraction separation membrane and algal liquid layer, upper layer center shaft drives the rotation centrifugation of mixing structure, DME is mixed and reacted with algal liquid to obtain mixture by penetrating extraction separation membrane, the mixture is separated and recovered by DME gasification chamber for DME gasification, and water-oil mixture is separated by micro water-oil separation device, so as to obtain algal oil.The application provides a kind of micro-reaction devices for extracting algal oil, which can fully utilize the characteristics of dimethyl ether to extract algal oil.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy equipment, and particularly relates to a micro-reaction device for extracting algal oil. BACKGROUND

[0002] Algae is considered to be a very promising biofuel, which has the advantages of not occupying arable land, strong growth ability and large oil content. Therefore, it is necessary to collect and utilize algae. However, how to realize energy-saving dewatering and extract oil from microalgae containing a large amount of water has become the focus of social research.

[0003] In the method for extracting algal oil, liquefied dimethyl ether is a safe, efficient and green solvent without secondary pollution. Dimethyl ether is a colorless gas with special ether fragrance, which can be miscible with many polar and non-polar substances, so it can extract fat-soluble components and dissolve part of water-soluble components, and the price is lower than that of propane and butane. At the same time, it is inert and not easy to react chemically, non-corrosive and non-carcinogenic, which is an ideal extraction solvent.

[0004] Subcritical dimethyl ether (DME) does not require dry algae as raw material, thereby saving a large amount of energy used in the drying process. Since DME is gaseous at normal environmental conditions, it can be easily evaporated from the extracted lipids by reduced pressure, and does not require subsequent separation steps as in traditional solvent-based extraction. DME can be easily liquefied at 0.51-0.59 MPa or <-24.8 degrees as a solvent, which helps to easily recover DME from the reaction stream. Liquefied DME has high affinity for organic compounds and has moderate polarity, which makes it suitable for extracting polar and non-polar lipids. Compared with other extractions, liquefied DME is partially miscible with water and can absorb 7-8wt% of water at room temperature. Therefore, dimethyl ether can simultaneously dewater and extract lipids from wet microalgae. However, the amount of wet microalgae that needs to be processed by the actual factory for the production of biodiesel cannot be directly dewatered and extracted by dimethyl ether. Therefore, there is an urgent need for a continuous micro-reaction device for realizing dewatering of algal liquid and extraction of oil by using liquefied dimethyl ether, which is widely used in the chemical industry, so as to expand the industrial scale and promote the new energy process of replacing traditional fuel oil with biodiesel. SUMMARY

[0005] The purpose of the present application is to provide a micro-reaction device for extracting algal oil, which can fully utilize the characteristics of dimethyl ether for algal oil extraction.

[0006] The technical scheme adopted by the micro-reaction device for extracting algal oil disclosed by the present application is:

[0007] The utility model provides a kind of micro-reaction device of extracting algal oil, including solid-liquid microextractor, DME gasification chamber and micro water-oil separation device arranged in sequence, the solid-liquid microextractor includes upper layer center shaft, the peripheral wall of the upper layer center shaft is equipped with several DME mixing layers, several DME mixing layers are evenly distributed around the axial center of upper layer center shaft, two adjacent DME mixing layers are equipped with algae liquid layer, the lateral wall of the algae liquid layer is in contact with the lateral wall of DME mixing layer, extraction separation membrane is equipped between the lateral wall of the algae liquid layer and the lateral wall of DME mixing layer, the top of the algae liquid layer is equipped with algae liquid inlet, the bottom of the algae liquid layer is equipped with solid algae discharge port, the upper layer center shaft is equipped with DME delivery pipe, the bottom of the DME delivery pipe is out of the upper layer center shaft, the peripheral wall of the bottom of the DME delivery pipe is equipped with DME discharge port corresponding to the position of DME mixing layer, DME mixing layer is equipped with DME inlet corresponding to the position of DME discharge port, the top of the DME mixing layer is equipped with mixture discharge port, the mixture discharge port is communicated with DME gasification chamber, and the DME gasification chamber is communicated with micro water-oil separation device.

[0008] As a preferred scheme, the algae liquid layer is equipped with algae liquid flow channel, the algae liquid flow channel is serpentine, one end of the algae liquid flow channel is provided corresponding to the algae liquid inlet, and the other end of the algae liquid flow channel is provided corresponding to the solid algae discharge port.

[0009] As a preferred scheme, the bottom of the DME delivery pipe is equipped with lower layer center shaft, the peripheral wall of the lower layer center shaft is equipped with several collection boxes, several collection boxes are evenly distributed around the axial center line of lower layer center shaft, the top surface of the collection box is equipped with solid algae inlet, and the solid algae inlet is matched with the solid algae discharge port.

[0010] As a preferred scheme, the DME gasification chamber includes several liquefaction layers arranged from top to bottom in sequence, two adjacent liquefaction layers are equipped with flash layer, the top of the liquefaction layer is equipped with mixture inlet, gas DME outlet, gas DME inlet and liquefied DME outlet, the mixture discharge port is communicated with the mixture inlet, the mixture inlet is communicated with the flash layer, the gas DME outlet is communicated with the flash layer, the gas DME outlet is communicated with the gas DME inlet by compressor, the DME flow channel is equipped in the liquefaction layer, one end of the DME flow channel is provided corresponding to the gas DME inlet, the other end of the DME flow channel is provided corresponding to the liquefied DME outlet, and the liquefied DME outlet is communicated with the flash layer.

[0011] As a preferred scheme, the micro water-oil separation device comprises a water-oil separation layer, the upper and lower sides of the water-oil separation layer are provided with first sealing plate layers, the water-oil separation layer is communicated with a DME gasification chamber, a water-oil separation membrane is arranged in the water-oil separation layer, the water-oil separation layer is sequentially divided into an oil phase layer and a water phase layer from top to bottom through the water-oil separation membrane, an oil phase outlet is formed in the top surface of the oil phase layer, and a water phase outlet is formed in the bottom surface of the water phase layer.

[0012] As a preferred scheme, a first heat exchange layer is arranged between the water-oil separation layer and the first sealing plate layer, a heat exchange fluid inlet and a heat exchange fluid outlet are formed in the first heat exchange layer, and a heat exchange flow channel is formed in the first heat exchange layer, one end of the heat exchange flow channel is provided corresponding to the heat exchange fluid inlet, and the other end of the heat exchange flow channel is provided corresponding to the heat exchange fluid outlet.

[0013] As a preferred scheme, the micro water-oil separation device further comprises a micro heat exchanger, the micro heat exchanger comprises a second sealing plate layer, a second heat exchange layer, an algal liquid initial layer and a third sealing plate layer arranged in sequence from top to bottom, and the algal liquid initial layer is communicated with the algal liquid layer.

[0014] The micro reaction device for extracting algal oil disclosed in the application has the following beneficial effects: algal liquid is input into the algal liquid layer from the algal liquid inlet at the top end of the algal liquid layer, liquefied DME is transported through the DME delivery pipe, sequentially passes through the DME discharge port and the DME inlet port and enters the DME mixing layer, the algal liquid layer and the DME mixing layer are rotated and centrifuged by the upper center shaft, the DME penetrates the extraction separation membrane and enters the algal liquid layer to fully mix and react with the algal liquid to extract oil, the reacted DME, the extracted algal oil and water are re-penetrated into the DME mixing layer through the extraction separation membrane, and then discharged from the mixture discharge port into the DME gasification chamber for DME gasification separation and recovery, and finally the remaining water-oil mixture is transported into the micro water-oil separation device for water-oil separation, so that the algal oil is obtained, and only solid microalgae are left in the algal liquid layer after extraction and reaction, and the solid microalgae are precipitated to the bottom under the action of gravity and discharged from the solid algal discharge port. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a structural schematic diagram of the micro reaction device for extracting algal oil.

[0016] Figure 2 FIG. 3 is a structural schematic diagram of the solid-liquid micro extractor of the micro reaction device for extracting algal oil.

[0017] Figure 3 FIG. 5 is a structural schematic diagram of the DME mixing layer of the micro reaction device for extracting algal oil.

[0018] Figure 4 FIG. 7 is a structural schematic diagram of the algal liquid layer of the micro reaction device for extracting algal oil.

[0019] Figure 5 is a structural diagram of a DME gasification chamber of a micro-reaction device for extracting algal oil.

[0020] Figure 6 is a structural diagram of a micro-water-oil separation device of a micro-reaction device for extracting algal oil.

[0021] Figure 7 is a structural diagram of a micro-heat exchanger of a micro-reaction device for extracting algal oil.

[0022] 10, solid-liquid micro-extractor; 11, upper central rotating shaft; 12, DME mixing layer; 121, DME feeding port; 122, mixture discharging port; 13, algal liquid layer; 131, algal liquid feeding port; 132, solid algal discharging port; 133, algal liquid flow channel; 14, extraction separation membrane; 15, DME conveying pipe; 151, DME discharging port; 16, lower central rotating shaft; 17, collection box; 171, solid algal feeding port; 20, DME gasification chamber; 21, liquefaction layer; 211, mixture feeding port; 212, gaseous DME outlet; 213, gaseous DME inlet; 214, liquefied DME outlet; 215, DME flow channel; 22, flash evaporation layer; 23, compressor; 30, micro-water-oil separation device; 31, water-oil separation layer; 32, first sealing plate layer; 33, water-oil separation membrane; 34, oil phase layer; 341, oil phase outlet; 35, water phase layer; 351, water phase outlet; 36, first heat exchange layer; 361, heat exchange fluid inlet; 362, heat exchange fluid outlet; 363, heat exchange flow channel; 40, micro-heat exchanger; 41, second sealing plate layer; 42, second heat exchange layer; 43, algal liquid initial layer; 44, third sealing plate layer. DETAILED DESCRIPTION

[0023] The present application will be further described and illustrated below in conjunction with specific examples and the accompanying drawings:

[0024] Please refer to Figures 1 to 4The utility model provides a kind of micro-reaction device of extracting algal oil, including solid-liquid microextractor 10, DME gasification chamber 20 and micro water-oil separation device 30 arranged in sequence, solid-liquid microextractor 10 includes upper layer center shaft 11, the peripheral wall of upper layer center shaft 11 is equipped with several DME mixing layers 12, several DME mixing layers 12 are evenly distributed around the axial center of upper layer center shaft 11, two adjacent DME mixing layers 12 are equipped with algae liquid layer 13, the side wall of algae liquid layer 13 is in contact with the side wall of DME mixing layer 12, and the side wall between the side wall of DME mixing layer 12 of algae liquid layer 13 is equipped with extraction separation membrane 14, the top end of algae liquid layer 13 is provided with algae liquid inlet 131, and the bottom end of algae liquid layer 13 is provided with solid algae outlet 132, and DME conveying pipe 15 is arranged in upper layer center shaft 11, the bottom end of DME conveying pipe 15 is out of upper layer center shaft 11, and DME outlet 151 is formed in the peripheral wall of the bottom end of DME conveying pipe 15 corresponding to the position of DME mixing layer 12, DME inlet 121 is formed in DME mixing layer 12 corresponding to the position of DME outlet 151, and mixture outlet 122 is formed in the top end of DME mixing layer 12, which is communicated with DME gasification chamber 20, and DME gasification chamber 20 is communicated with micro water-oil separation device 30.

[0025] In the above scheme, the algae liquid is input into the algae liquid layer 13 from the algae liquid inlet 131 at the top end of the algae liquid layer 13, and the liquefied DME is conveyed through the DME conveying pipe 15, sequentially passes through the DME outlet 151 and the DME inlet 121, and enters the DME mixing layer 12, the upper layer center shaft 11 drives the algae liquid layer 13 and the DME mixing layer 12 to rotate and centrifuge, the DME penetrates through the extraction separation membrane 14 into the algae liquid layer 13, fully mixes and reacts with the algae liquid to extract oil, and the reacted DME, the extracted algal oil and water are re-penetrated through the extraction separation membrane 14 into the DME mixing layer 12, and then discharged from the mixture outlet 122 into the DME gasification chamber 20 for DME gasification separation and recovery, and finally the remaining water-oil mixture is conveyed into the micro water-oil separation device 30 for water-oil separation, so as to obtain the algal oil, and the algae liquid layer 13 only leaves solid microalgae after extraction reaction, and the solid microalgae is precipitated to the bottom under the action of gravity and discharged from the solid algae outlet 132.

[0026] Please refer to Figure 4 The algae liquid layer 13 is provided with an algae liquid flow channel 133, the algae liquid flow channel 133 is serpentine, one end of the algae liquid flow channel 133 corresponds to the algae liquid inlet 131, and the other end of the algae liquid flow channel 133 corresponds to the solid algae outlet 132.

[0027] In the above scheme, the algae liquid enters the algae liquid flow channel 133 in the algae liquid layer 13 from the algae liquid inlet 131 at the top end of the algae liquid layer 13, passes through the serpentine-shaped algae liquid flow channel 133, slows down the flow speed of the algae liquid, increases the flow time of the algae liquid, thereby increasing the reaction time of the algae liquid with the DME, so that the algae liquid can be fully reacted to extract oil, and the solid microalgae obtained after the oil extraction is discharged from the solid algae outlet 132.

[0028] Please refer to Figure 1 and Figure 2 The bottom end of the DME delivery pipe 15 is provided with a lower center shaft 16, the peripheral wall of the lower center shaft 16 is provided with a plurality of collection boxes 17, the plurality of collection boxes 17 are uniformly distributed around the axial center line of the lower center shaft 16, and the top surface of the collection box 17 is provided with a solid algae inlet 171 which is matched with the solid algae outlet 132.

[0029] In the above scheme, the solid microalgae discharged from the solid algae outlet 132 enters the collection box 17 through the solid algae inlet 171, the lower center shaft 16 and the upper center shaft 11 operate independently and do not affect each other, after the corresponding collection box 17 at the bottom end of the algae liquid layer 13 is collected, the lower center shaft 16 drives the collection box 17 to rotate, and the collection box 17 at the bottom end of the DME mixing layer 12 is replaced by the collection box 17 which has been collected to continue the collection, thereby saving time and space, improving the extraction efficiency, and the solid microalgae in the collection box 17 can be used as solid fuel after being discharged and reused, and the collected solid microalgae can be used as solid fuel to save energy consumption.

[0030] Please refer to Figure 1 and Figure 5 The DME gasification chamber 20 includes a plurality of liquefaction layers 21 arranged in sequence from top to bottom, a flash layer 22 is arranged between adjacent two liquefaction layers 21, the mixture inlet 211, the gas DME outlet 212, the gas DME inlet 213 and the liquefied DME outlet 214 are arranged on the liquefaction layer 21, the mixture outlet 122 is in communication with the mixture inlet 211, the mixture inlet 211 is in communication with the flash layer 22, the gas DME outlet 212 is in communication with the flash layer 22, the gas DME outlet 212 and the gas DME inlet 213 are in communication through the compressor 23, the DME flow channel 215 is arranged in the liquefaction layer 21, one end of the DME flow channel 215 corresponds to the gas DME inlet 213, the other end of the DME flow channel 215 corresponds to the liquefied DME outlet 214, and the liquefied DME outlet 214 is in communication with the flash layer 22.

[0031] In the above scheme, the algae liquid and DME mixture obtained by extraction enters the flash layer 22 through the mixture inlet 211, and the gasified gas DME is separated after being flashed in the flash layer 22. The gas DME is discharged from the gas DME outlet 212, compressed by the compressor 23 to increase the temperature and pressure, and then enters the DME flow channel 215 from the gas DME inlet 213. The gas DME is liquefied and exothermed in the pressurization process, and then reenters the flash layer 22 through the liquefied DME outlet 214 for recycling. The flash layer 22 between the liquefaction layers 21 fully utilizes the generated condensation latent heat as a heat source for the flash layer 22, reducing the energy loss in the entire operation process. After multiple flashings, the gas DME can be completely separated from the water-oil mixture. The water-oil mixture flows out from the bottommost liquefied DME outlet 214, and the DME is recycled and used to reduce equipment costs and avoid waste of evaporation latent heat and temperature loss in the flashing process.

[0032] Please refer to Figure 1 and Figure 6 The micro water-oil separation device 30 includes a water-oil separation layer 31, and first sealing plate layers 32 are arranged on the upper and lower sides of the water-oil separation layer 31. The water-oil separation layer 31 is in communication with the DME gasification chamber 20, and a water-oil separation membrane 33 is arranged in the water-oil separation layer 31. The water-oil separation layer 31 is divided into an oil phase layer 34 and a water phase layer 35 from top to bottom through the water-oil separation membrane 33. An oil phase outlet 341 is arranged on the top surface of the oil phase layer 34, and a water phase outlet 351 is arranged on the bottom surface of the water phase layer 35.

[0033] In the above scheme, the water-oil mixture enters the water-oil separation layer 31, and the water-oil separation layer 31 is divided into the oil phase layer 34 and the water phase layer 35 through the water-oil separation membrane 33. The upper layer is the oil phase layer 34, and the lower layer is the water phase layer 35. The water-oil mixture is stratified under the action of gravity, and the oil phase is discharged from the oil phase outlet 341 upward, and the water phase is discharged from the water phase outlet 351 downward. In this embodiment, the water-oil separation membrane 33 is a cellulose-based material, which is a green and environmentally friendly material with biodegradability and good environmental tolerance.

[0034] Please refer to Figure 6 A first heat exchange layer 36 is arranged between the water-oil separation layer 31 and the first sealing plate layer 32. A heat exchange fluid inlet 361 and a heat exchange fluid outlet 362 are arranged in the first heat exchange layer 36. A heat exchange flow channel 363 is arranged in the first heat exchange layer 36, one end of the heat exchange flow channel 363 corresponds to the heat exchange fluid inlet 361, and the other end of the heat exchange flow channel 363 corresponds to the heat exchange fluid outlet 362.

[0035] In the above scheme, the industrial waste heat flows into the heat exchange channel 363 in the first heat exchange layer 36 through the heat exchange fluid inlet 361, and then is discharged from the heat exchange fluid outlet 362, so that the water-oil mixture is heated by the first heat exchange layer 36, which is beneficial to water-oil separation and improves the separation efficiency. In the embodiment, the heat exchange channel 363 is in a serpentine shape. The serpentine heat exchange channel 363 can slow down the flow speed of the heat exchange fluid, prolong the heating time, and enhance the heating effect.

[0036] Please refer to Figure 1 and Figure 7 The micro heat exchanger 40 is further included, and the micro heat exchanger 40 comprises, from top to bottom, a second sealing plate layer 41, a second heat exchange layer 42, an algal liquid initial layer 43, and a third sealing plate layer 44. The algal liquid initial layer 43 is in communication with the algal liquid layer 13.

[0037] In the above scheme, the micro heat exchanger 40 is used to heat the algal liquid, and the efficiency of algal oil extraction can be improved after the algal liquid is heated by the second heat exchange layer 42. It should be noted that the structure of the second heat exchange layer 42 is the same as that of the first heat exchange layer 36, and therefore is not described again.

[0038] The micro reaction device for extracting algal oil is provided. The algal liquid is input into the algal liquid layer from the algal liquid inlet at the top end of the algal liquid layer. The liquefied DME is delivered through the DME delivery pipe, and then enters the DME mixing layer through the DME discharge outlet and the DME inlet. The upper center shaft drives the algal liquid layer and the DME mixing layer to rotate and centrifuge. The DME penetrates the extraction separation membrane into the algal liquid layer, and fully mixes and reacts with the algal liquid to extract oil. The reacted DME, the extracted algal oil, and the water are re-penetrated into the DME mixing layer through the extraction separation membrane, and then discharged from the mixture discharge outlet into the DME gasification chamber for DME gasification separation and recovery. Finally, the remaining water-oil mixture is delivered into the micro water-oil separation device for water-oil separation, so as to obtain the algal oil. After the extraction reaction, the algal liquid layer only leaves the solid microalgae, which is precipitated to the bottom under the action of gravity and discharged from the solid algal discharge outlet.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A microreactor for extracting algal lipid, characterized by, The device comprises a solid-liquid microextractor, a DME gasification chamber and a micro water-oil separation device arranged in sequence, the solid-liquid microextractor comprises an upper central rotating shaft, the peripheral wall of the upper central rotating shaft is provided with a plurality of DME mixing layers, the plurality of DME mixing layers are uniformly distributed around the axial center of the upper central rotating shaft, an algae liquid layer is arranged between two adjacent DME mixing layers, the side wall of the algae liquid layer is in contact with the side wall of the DME mixing layer, an extraction separation membrane is arranged between the side wall of the algae liquid layer and the side wall of the DME mixing layer, an algae liquid inlet is arranged at the top end of the algae liquid layer, and a solid algae outlet is arranged at the bottom end of the algae liquid layer, a DME conveying pipe is arranged in the upper central rotating shaft, the bottom end of the DME conveying pipe penetrates out of the upper central rotating shaft, a DME outlet is arranged on the peripheral wall of the bottom end of the DME conveying pipe corresponding to the position of the DME mixing layer, a DME inlet is arranged on the DME mixing layer corresponding to the position of the DME outlet, a mixture outlet is arranged at the top end of the DME mixing layer, the mixture outlet is communicated with the DME gasification chamber, the DME gasification chamber is communicated with the micro water-oil separation device, an algae liquid flow channel is arranged in the algae liquid layer, the algae liquid flow channel is in a serpentine shape, the upper central rotating shaft drives the algae liquid layer and the DME mixing layer to rotate and centrifuge, DME penetrates into the algae liquid layer through the extraction separation membrane, is fully mixed with the algae liquid, reacts and extracts oil, and the reacted DME, the extracted algae oil and water penetrate into the DME mixing layer through the extraction separation membrane again.

2. The microreactor for extracting algal oil according to claim 1, wherein One end of the algae liquid flow channel is arranged corresponding to the algae liquid inlet, and the other end of the algae liquid flow channel is arranged corresponding to the solid algae outlet.

3. The microreactor for extracting algal oil according to claim 1, wherein The bottom end of the DME conveying pipe is provided with a lower central rotating shaft, the peripheral wall of the lower central rotating shaft is provided with a plurality of collection boxes, the plurality of collection boxes are uniformly distributed around the axial center line of the lower central rotating shaft, a solid algae inlet is arranged on the top surface of the collection box, and the solid algae inlet is matched with the solid algae outlet.

4. The microreactor for extracting algal oil according to claim 1, wherein The DME gasification chamber comprises a plurality of liquefaction layers arranged in sequence from top to bottom, a flashing layer is arranged between two adjacent liquefaction layers, a mixture inlet, a gas DME outlet, a gas DME inlet and a liquefied DME outlet are arranged on the liquefaction layer, the mixture outlet is communicated with the mixture inlet, the mixture inlet is communicated with the flashing layer, the gas DME outlet is communicated with the flashing layer, the gas DME outlet and the gas DME inlet are communicated through a compressor, and a DME flow channel is arranged in the liquefaction layer, one end of the DME flow channel is arranged corresponding to the gas DME inlet, the other end of the DME flow channel is arranged corresponding to the liquefied DME outlet, and the liquefied DME outlet is communicated with the flashing layer.

5. The microreactor for extracting algal oil according to claim 1, wherein The micro water-oil separation device comprises a water-oil separation layer, the upper and lower sides of the water-oil separation layer are both provided with a first sealing plate layer, the water-oil separation layer is communicated with the DME gasification chamber, a water-oil separation membrane is arranged in the water-oil separation layer, the water-oil separation layer is divided into an oil phase layer and a water phase layer from top to bottom through the water-oil separation membrane, an oil phase outlet is arranged on the top surface of the oil phase layer, and a water phase outlet is arranged on the bottom surface of the water phase layer.

6. The microreactor for extracting algal oil according to claim 5, wherein The first heat exchange layer is provided between the water-oil separation layer and the first sealing plate layer, and the first heat exchange layer is provided with a heat exchange fluid inlet and a heat exchange fluid outlet.

7. The microreactor for extracting algal oil according to claim 1, wherein The micro heat exchanger comprises a second sealing plate layer, a second heat exchange layer, an algal liquid initial layer and a third sealing plate layer arranged in sequence from top to bottom, and the algal liquid initial layer is communicated with the algal liquid layer.

Images