CN212504248U - Three-layer staggered variable-aperture shearing aerator and microalgae culture system - Google Patents
Three-layer staggered variable-aperture shearing aerator and microalgae culture system Download PDFInfo
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- CN212504248U CN212504248U CN202021332747.4U CN202021332747U CN212504248U CN 212504248 U CN212504248 U CN 212504248U CN 202021332747 U CN202021332747 U CN 202021332747U CN 212504248 U CN212504248 U CN 212504248U
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- 238000005276 aerator Methods 0.000 title claims abstract description 68
- 238000010008 shearing Methods 0.000 title claims abstract description 57
- 238000005273 aeration Methods 0.000 claims abstract description 57
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- 239000002184 metal Substances 0.000 claims abstract description 34
- 239000000843 powder Substances 0.000 claims abstract description 18
- 238000005245 sintering Methods 0.000 claims abstract description 16
- 229910052799 carbon Inorganic materials 0.000 claims description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 238000003306 harvesting Methods 0.000 claims description 20
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- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 abstract description 28
- 238000002156 mixing Methods 0.000 abstract description 5
- 230000036983 biotransformation Effects 0.000 abstract description 2
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- 241000195493 Cryptophyta Species 0.000 description 16
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- UIIMBOGNXHQVGW-UHFFFAOYSA-M sodium bicarbonate Substances [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 12
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- 229910000029 sodium carbonate Inorganic materials 0.000 description 10
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- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 2
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- 241001040275 Spirulina salina Species 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The utility model relates to a CO2A biotransformation utilization technology, aiming at providing a three-layer staggered variable-aperture shearing aerator and a microalgae culture system. The aerator comprises a circular tubular main body with one open end and the other closed end; the circular tubular body has three in the radial directionThe layer structure is sequentially an axial rectangular woven mesh shearing aeration layer, a radial rectangular woven mesh shearing aeration layer and a metal powder sintering round hole shearing aeration layer from inside to outside. The utility model can rapidly divide the bubbles into smaller volumes by applying shearing force to the bubbles in different directions through the rectangular edges; the round hole further reduces the bubble generation diameter, so that the bubble generation size and the spatial distribution are more uniform. Compare in the aerator of pure three-layer round hole of using, the utility model discloses showing and improving aeration rate and reduced the bubble and generated the diameter, can increase of service life, reduce the bubble and generate the time, reduce bubble and liquid mixing time, improve gas-liquid mass transfer efficiency.
Description
Technical Field
The utility model relates to a CO2A biotransformation utilization technology, in particular to a three-layer staggered variable-aperture shearing aerator and a microalgae culture system.
Background
Large amount of CO discharged from fossil fuel2Causing serious greenhouse effect environmental problem and leading the flue gas to be CO2The emission reduction, conversion and utilization are of great significance to energy conservation, environmental protection and low-carbon economy. The microalgae has the unique advantages of fast growth, high oil content and the like, the quantum efficiency for converting solar energy into biomass energy is as high as 2-10 percent (while the quantum efficiency of terrestrial plants is less than 1 percent), the biomass growth can reach 1-3 times every day, and the method is that CO is converted and utilized by a biological method2An effective method of (1). Coal chemical plant tailSeparating and purifying gas, power plant exhaust gas, industrial furnace flue gas and the like to obtain food-grade CO with the purity of 99.9 percent2Can be used for culturing microalgae. The raceway pond photosynthetic reactor is microalgae culture equipment which is the most widely applied in engineering at present, but the food grade is high-purity CO2The utilization efficiency is low, the production cost of the microalgae is increased, and the yield of the microalgae biomass is limited.
Traditionally using CO2The method is to continuously introduce CO through an aerator arranged in a raceway pond2The bubbles supply microalgae to synthesize organic matters. Researchers propose some special turbulence structures or improve aeration structures to optimize the raceway pond reactor, so as to enhance the fluid turbulence effect and improve the gas-liquid mixed mass transfer efficiency. However, there is still a large amount of CO2The gas cannot be rapidly absorbed by the microalgae to escape out of the raceway pond reactor, and the escaping CO2The gas not only causes environmental hazards but also increases the production cost of microalgae. Mokashi et al demonstrated HCO3 -Can replace inorganic carbon source to supply microalgae so as to better synthesize organic matters required by the microalgae. From CO2HCO from gas conversion3 -Theoretically, the carbon source can be completely absorbed by microalgae cells, so that the carbon source can be supplemented to the culture solution through early-stage carbonization reaction, and the method can obviously improve CO2Utilization efficiency and economic benefits. Song et al proposed an ammonia absorption process for converting CO2Conversion to NH4HCO3The solution is then supplied to microalgae for growth and utilization of HCO3 -And (4) synthesizing biomass. Whereas conventional aerators produce CO2Large bubble size and HCO formation by carbonization3 -The conversion efficiency is low, and the number of the aerators to be arranged is large, so that the equipment cost is high. In the case of a raceway pond reactor with the occupation area reaching hundreds of acres in a microalgae enterprise, the problem of high-efficiency and low-cost carbon source supplement is difficult to solve.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to overcome the not enough among the prior art, provide a three-layer alternating aperture of becoming shearing aerator and little algae farming systems.
In order to solve the technical problem, the utility model discloses a solution is:
providing a three-layer staggered variable-aperture shearing aerator which comprises a circular tubular main body with one open end and the other closed end; the circular tubular main body is provided with a three-layer structure in the radial direction and sequentially comprises an axial rectangular woven mesh shearing aeration layer, a radial rectangular woven mesh shearing aeration layer and a metal powder sintering round hole shearing aeration layer from inside to outside; or the radial rectangular woven mesh shearing aeration layer, the axial rectangular woven mesh shearing aeration layer and the metal powder sintering round hole shearing aeration layer are sequentially arranged from inside to outside;
in the axial rectangular mesh grid shearing aeration layer and the radial rectangular mesh grid shearing aeration layer, the length-width ratio of rectangular meshes is 3-5: 1, and the area equivalent is a round hole with the diameter of 150 mu m; the long sides of the rectangular meshes of the two-layer structure are mutually vertical and are arranged in a staggered way; on the metal powder sintering round hole shearing aeration layer, the diameter of the round hole is equivalent to 10-100 mu m; the distance between every two adjacent layers of structures is 30-60 mu m.
As an improvement, the axial rectangular mesh grid shear aeration layer and the radial rectangular mesh grid shear aeration layer are both made of metal stainless steel wires by weaving; the metal powder sintered round hole shearing aeration layer is made by sintering metal titanium powder.
As an improvement, the length of the round tubular main body is 0.8-1.5 m, and the diameter of the innermost layer structure is 50 mm.
The utility model discloses in further provide utilize aforementioned three-layer alternating form to change aperture shearing aerator to construct little algae farming systems that form, including CO2The system comprises a supply system, a carbon supplementing system, a microalgae cultivation and harvesting system and a circulating water return system; the carbon supplementing system comprises a horizontal tank, and is connected with a circulating water return pipeline of a circulating water return system through a top inlet and a bottom outlet of the horizontal tank; the three-layer staggered variable-aperture shear aerator is horizontally arranged in the horizontal tank, and the open end of the aerator is connected to CO through a pipeline2And a supply system constituting a carbon supply system.
As an improvement, the CO2The supply system comprises sequentially connected CO via pipeline2Storage tank, CO2Flow meters, dryers, check valves, and ball valves.
The method for realizing the microalgae circulating backwater cultivation by using the microalgae cultivation system comprises the following steps:
(1) adding or supplementing nutrient salt Na into microalgae liquid circulating backwater after biomass harvesting2CO3The mixture is pumped into a horizontal tank by a water pump;
(2) by using the staggered variable-aperture structure of the three-layer staggered variable-aperture shear aerator, CO is treated2CO of supply system2Shearing the gas to finally form micron-sized bubbles with the diameter of 0.7-2.5 mm; CO 22Micron-sized bubbles and circulating backwater are mixed in a horizontal tank, and NaHCO is formed through carbonation reaction3(ii) a Sending the circulating backwater after the carbonation reaction into a raceway pond photosynthetic reactor for cultivating microalgae;
CO2the gas can be obtained by separating and purifying CO from tail gas of coal chemical industry plant, flue gas discharged from power plant or flue gas of industrial furnace2The purity is 99.9%; and keeping the pressure in the horizontal tank at 0.2-0.4 MPa. And controlling the ambient illumination intensity in the photosynthetic reactor of the runway pool to be 4000-100000 lux, the ambient temperature to be 18-38 ℃ and the pH to be 8-12.
(3) Adjusting CO according to the pH value of the algae liquid in the photosynthetic reactor of the raceway pond2Gas flow or nutrient salt Na control2CO3To adjust the amount of NaHCO produced in the circulating backwater3Concentration, thereby promoting the photosynthesis of the microalgae to grow and fix carbon. Control of Na2CO3In an amount of Na to be added to the circulating return water before entering the horizontal tank2CO3The concentration is 8-14 g/L. The microalgae used in the raceway pond photosynthetic reactor can be selected from Spirulina platensis, Spirulina maxima or Spirulina subsalsa.
Description of the principle:
the middle aerator of the utility model mainly adopts a three-layer structure. The two rectangular weaving aeration layers in the inner part cut the bubbles by using the rectangular edges, and the bubbles can be quickly divided into smaller volumes by applying shearing force to the bubbles in different directions through the rectangular edges; the weaving direction of the two layers of internal rectangles is divided into an axial rectangle and a radial rectangle (the weaving direction of the inner layer rectangle and the middle layer rectangle can be exchanged), and when the rectangles between the two inner layers are installed, the long edge directions are ensured to be mutually vertical so as to provide mutually vertical cutting force, so that bubbles are quickly cut at different angles in the generating process. The circular hole aeration layer at the outermost layer can further reduce the bubble generation diameter, and the bubble generation size and the spatial distribution are more uniform. Compared with the pure aerator using three layers of round holes, the utility model obviously improves the aeration rate and reduces the diameter of bubble generation.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the three-layer staggered variable-aperture shearing aerator of the utility model is arranged in a horizontal tank to generate CO2Na in microbubble and circulating backwater2CO3Performing a carbonation reaction to form NaHCO3The carbon source required by the growth of the microalgae can be provided to effectively improve CO2The utilization efficiency reduces the production cost of microalgae. Compared with the traditional rubber strip porous aerator widely used in industry, the service life of the metal aerator equipment is prolonged by 6-8 times, the bubble generation diameter is reduced by 69.3-78.9% and reaches 0.7-2.5 mm, the bubble generation time is reduced by 48.6-54.5% and reaches 4.9-5.9 s, and CO is generated by CO2The mixing time of the bubbles and the liquid is reduced by 43 to 55 percent, the gas-liquid mass transfer efficiency is improved by 45 to 62 percent, and therefore, the CO is mixed with the liquid2Formation of NaHCO by carbonation reaction3The conversion efficiency is improved to 82.3% -91.6%.
2. CO generated by the aerator2Micro-bubbles are subjected to carbonation reaction to generate NaHCO3And the circulating backwater is sent into the raceway pond photosynthetic reactor through a pipeline for cultivating the microalgae. The conventional rubber strip porous aerator is arranged in the raceway pond for direct CO2Compared with an aerated algae cultivation system, the practical photochemical efficiency of the photosynthesis in the microalgae cells of the system is improved by 1.9-2.8 times, the biomass yield is improved by 45-80%, and CO is increased by 45-80%2The utilization efficiency of the biomass from the gas to the algae powder is improved by 3.9-5.8 times.
Drawings
Fig. 1 is a three-dimensional structure diagram of the three-layer staggered variable-aperture shearing aerator of the utility model.
The reference numbers in the figures are: 1-1, shearing and aerating layer of an axial rectangular woven net; 1-2, shearing and aerating layers of radial rectangular woven nets; 1-3 metal powder sintering round hole shearing aeration layer.
FIG. 2 is a schematic diagram of a system for cultivating microalgae by circulating water through an aerator.
The reference numbers in the figures are: 1 CO2Storing the tank; 2 CO2A flow meter; 3, a dryer; 4 a check valve; 5, ball valve; 6 three layers of staggered variable-aperture shearing aerators; 7, horizontal tank; 8, a pressure gauge; 9, a sewage draining outlet; 10, circulating the water back to the pool; 11 a photosynthetic reactor in a runway pool; 12 microalgae biomass harvesting equipment; 13 a waste liquid tank; 14, a water pump; 15 liquid flow meter.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The examples are intended to provide those skilled in the art with a more complete understanding of the present invention, and are not intended to limit the invention in any way.
As shown in figure 1, the three-layer staggered variable-aperture shear aerator is a circular tubular structure (the length of the outside of the equipment is 0.8-1.5 m, the diameter of the innermost layer structure is 50mm) consisting of three shear aeration layers, and the distance between every two adjacent layers of structures is 30-60 mu m. CO 22The gas sequentially passes through an axial rectangular woven mesh shearing aeration layer 1-1 (made by weaving metal stainless steel wires) with the equivalent circumferential diameter of 150 mu m, a radial rectangular woven mesh shearing aeration layer 1-2 (made by weaving metal stainless steel wires) with the equivalent circumferential diameter of 150 mu m and a metal powder sintering round hole shearing aeration layer 1-3 (made by sintering metal titanium powder) with the equivalent round hole diameter of 10-100 mu m from inside to outside. CO 22The air is sheared through a three-layer staggered variable-aperture structure of the aerator to finally form micron-sized bubbles with the diameter of 0.7-2.5 mm. In the shearing aeration layer of the axial rectangular woven net and the shearing aeration layer of the radial rectangular woven net, the length-width ratio of rectangular meshes is 3-5: 1, and the long sides of the rectangular meshes of the two-layer structure are mutually perpendicular and are arranged in a staggered manner.
As shown in FIG. 2, the entire microalgae cultivation system includes CO2A supply system, a carbon supply system, a microalgae cultivation and harvesting system and a circulating water return system. (1) CO 22Supply system from CO2The storage tank 1 is supplied with high purity CO of 99.9% purity2Gas (derived from tail gas of coal chemical industry plant, flue gas discharged by power plant, and CO in flue gas of industrial furnace and kiln2Obtained by separation and purification), sequentially passes through CO2The flow meter 2, the dryer 3, the check valve 4, the ball valve 5 enter an aerator installed inside the horizontal tank. (2) The carbon supplementing system comprises a horizontal tank 7 which is connected with a circulating water return pipeline of the circulating water return system through a top inlet and a bottom outlet of the horizontal tank; the three-layer staggered variable-aperture shear aerator 6 is horizontally arranged in a horizontal tank 7, the operating pressure inside the horizontal tank is 0.2-0.4 MPa, and a pressure gauge 8 and a sewage outlet 9 are arranged. CO produced by aerator2Microbubbles and supplement with nutritive salt Na2CO3(the amount of Na added was controlled so that the circulating returned water before entering the horizontal tank 7 was Na2CO38-14 g/L) of circulating backwater. (3) With CO produced by the aerator2Micro-bubbles are subjected to carbonation reaction to generate NaHCO3The circulating backwater is sent into a circulating backwater pool 10 for temporary storage through a pipeline, or is directly sent into a runway pool photosynthetic reactor 11 for culturing microalgae (the algae are spirulina platensis, spirulina maxima or spirulina salina). (4) Controlling the ambient light intensity of the photosynthetic reactor 11 in the raceway pond to be 4000-100000 lux, the ambient temperature to be 18-38 ℃, and the pH value of the solution in the photosynthetic reactor to be 8-12. Adjusting CO introduced into the aerator according to the pH value of the algae liquid in the photosynthetic reactor of the raceway pond2Gas flow or nutrient salt Na control2CO3To adjust the amount of NaHCO produced in the circulating backwater3Concentration, thereby promoting the photosynthesis of the microalgae to grow and fix carbon. After growing for 3-5 days, the microalgae are sent to a microalgae biomass harvesting device 12 for harvesting. (5) The circulating backwater after the biomass harvest is sent into a waste liquid pool 13 for processing and supplementing and adding nutritive salt Na2CO3The circulating backwater passes through a water pump 14 and a liquid flowmeter 15 and is sent into a horizontal tank 7 of the carbon supplementing system for recycling.
Example 1
The three-layer staggered variable-aperture shear aerator is a circular tubular structure consisting of three shear aeration layers (the length of the outside of the equipment is 1.5m, and the diameter of the innermost layer structure is 50 mm). The distance between every two aeration layers is 60 mu m. CO 22Gas sequentially passes through an axial rectangular (the length-width ratio is 5: 1) woven mesh shearing aeration layer (made by weaving metal stainless steel wires) with round holes with the equivalent diameter of 150 mu m of rectangular meshes from inside to outside, a radial rectangular (the length-width ratio is 5: 1) woven mesh shearing aeration layer (made by weaving metal stainless steel wires) with the equivalent diameter of 150 mu m of rectangular meshes and a metal powder sintered round hole shearing aeration layer (made by sintering metal titanium powder) with the equivalent diameter of 50 mu m of round holes; CO 22The air is sheared by a three-layer staggered variable-aperture structure of the aerator to finally form micron-sized bubbles with the diameter of 0.7 mm.
The whole microalgae culture system comprises CO2A supply system, a carbon supply system, a microalgae cultivation and harvesting system and a circulating water return system. (1) CO 22Supply system from CO2The storage tank provides high purity CO of 99.9% purity2Gas (derived from CO in tail gas of coal chemical plant2Obtained by separation and purification), sequentially passes through CO2The flow meter, the dryer, the check valve and the ball valve enter an aerator arranged inside the horizontal tank. (2) The carbon supplementing system comprises three layers of staggered variable-aperture shearing aerators, a horizontal tank, a pressure gauge and a sewage outlet. CO produced by aerator2Microbubbles and supplement with nutritive salt Na2CO3(the concentration is controlled to be 14g/L), circulating backwater is mixed, the internal pressure of the horizontal tank is controlled to be kept at 0.4MPa, and carbonation reaction is carried out to form NaHCO3. (3) With CO produced by the aerator2Micro-bubbles are subjected to carbonation reaction to generate NaHCO3The circulating backwater is sent into a circulating backwater pool through a pipeline for temporary storage, or is directly sent into a runway pool photosynthetic reactor for culturing microalgae (the algae are spirulina platensis). The ambient light intensity was controlled at 50000lux, the ambient temperature was controlled at 32 ℃ and the pH of the solution was controlled at 10. Adjusting CO introduced into the aerator according to the pH value of the algae liquid in the photosynthetic reactor of the raceway pond2Gas flow or nutrient salt Na control2CO3To adjust the amount of NaHCO produced in the circulating backwater3Concentration, thereby promoting the photosynthesis of the microalgae to grow and fix carbon. And (4) after the microalgae grow for 5 days, sending the microalgae into microalgae biomass harvesting equipment for harvesting. (4) Sending the circulating backwater after harvesting the biomass into a waste liquid pool, processing and supplementing and adding nutritive salt Na2CO3And the circulating backwater passes through a water pump and a liquid flowmeter and is sent into a horizontal tank of the carbon supplementing system for recycling.
Compared with the traditional rubber strip porous aerator widely used in industry, the service life of the metal aerator equipment is prolonged by 8 times, the bubble generation diameter is reduced by 78.9 percent to 0.7mm, the bubble generation time is reduced by 54.5 percent to 4.9s, and CO is generated2The mixing time of the bubbles and the liquid is reduced by 55 percent, the gas-liquid mass transfer efficiency is improved by 62 percent, thereby leading the CO to be2Formation of NaHCO by carbonation reaction3The conversion efficiency of (2) is improved to 91.6%. The conventional rubber strip porous aerator is arranged in the raceway pond for direct CO2Compared with the aeration algae-cultivating system, the practical photochemical efficiency of the photosynthesis in the microalgae cells of the system is improved by 2.8 times, the biomass yield is improved by 80 percent, and the CO is increased2The utilization efficiency of the biomass from gas conversion to algae powder is improved by 5.8 times.
Example 2
The three-layer staggered variable-aperture shear aerator is a circular tubular structure consisting of three shear aeration layers (the length of the outside of the equipment is 1.2m, and the diameter of the innermost layer structure is 50 mm). The distance between every two aeration layers is 45 μm. CO 22The gas sequentially passes through a radial rectangular (the length-width ratio is 4: 1) woven mesh shearing aeration layer (made by weaving metal stainless steel wires) with 150-micron round holes in the area equivalent diameter of rectangular meshes from inside to outside, an axial rectangular (the length-width ratio is 4: 1) woven mesh shearing aeration layer (made by weaving metal stainless steel wires) with 150-micron round holes in the area equivalent diameter of rectangular meshes and a metal powder sintering round hole shearing aeration layer (made by sintering metal titanium powder) with 100-micron round hole diameter equivalent diameter. CO 22The air is sheared by a three-layer staggered variable-aperture structure of the aerator to finally form micron-sized bubbles with the diameter of 1.6 mm.
The whole microalgae culture system comprises CO2A supply system, a carbon supply system, a microalgae cultivation and harvesting system and a circulating water return system. (1) CO 22Supply system from CO2The storage tank provides high purity CO of 99.9% purity2Gas (derived from CO in flue gas discharged by power plant2Obtained by separation and purification), sequentially passes through CO2The flow meter, the dryer, the check valve and the ball valve enter an aerator arranged inside the horizontal tank. (2) The carbon supplementing system comprises three layers of staggered variable-aperture shearing aerators, a horizontal tank, a pressure gauge and a sewage outlet. CO produced by aerator2Microbubbles and supplement with nutritive salt Na2CO3(the concentration is controlled to be 11g/L), circulating backwater is mixed, the internal pressure of the horizontal tank is controlled to be kept at 0.3MPa, and carbonation reaction is carried out to form NaHCO3. (3) With CO produced by the aerator2Micro-bubbles are subjected to carbonation reaction to generate NaHCO3The circulating backwater is sent into a circulating backwater pool through a pipeline for temporary storage, or is directly sent into a runway pool photosynthetic reactor for culturing microalgae (the algae are spirulina maxima). The ambient light intensity was controlled to be 100000lux, the ambient temperature was controlled to be 38 deg.C, and the pH of the solution was controlled to be 12. Adjusting CO introduced into the aerator according to the pH value of the algae liquid in the photosynthetic reactor of the raceway pond2Gas flow or nutrient salt Na control2CO3To adjust the amount of NaHCO produced in the circulating backwater3Concentration, thereby promoting the photosynthesis of the microalgae to grow and fix carbon. After growing for 4 days, the microalgae are sent into microalgae biomass harvesting equipment for harvesting. (4) Sending the circulating backwater after harvesting the biomass into a waste liquid pool, processing and supplementing and adding nutritive salt Na2CO3And the circulating backwater passes through a water pump and a liquid flowmeter and is sent into a horizontal tank of the carbon supplementing system for recycling.
Compared with the traditional rubber strip porous aerator widely used in industry, the service life of the metal aerator equipment is prolonged by 7 times, the bubble generation diameter is reduced by 74.2 percent to 1.6mm, the bubble generation time is reduced by 51.5 percent to 5.4s, and CO is generated2The mixing time of the bubbles and the liquid is reduced by 49 percent, the gas-liquid mass transfer efficiency is improved by 54 percent, thereby leading the CO to be2Formation of NaHCO by carbonation reaction3The conversion efficiency of (2) is improved to 86.9%. The conventional rubber strip porous aerator is arranged in the raceway pond for direct CO2Compared with the aeration algae-cultivating system, the practical photochemical efficiency of the photosynthesis in the microalgae cells of the system is improved by 2.4 times, the biomass yield is improved by 63 percent, and CO is increased by 63 percent2The utilization efficiency of the biomass of the gas converted into the algae powder is improved by 4.8 times.
Example 3
The three-layer staggered variable-aperture shear aerator is a circular tubular structure consisting of three shear aeration layers (the length of the outside of the equipment is 0.8m, and the diameter of the innermost layer structure is 50 mm). The distance between every two aeration layers is 30 μm. CO 22Gas sequentially passes through an axial rectangular (the length-width ratio is 3: 1) woven mesh shearing aeration layer (made by weaving metal stainless steel wires) with round holes with the equivalent diameter of 150 mu m of rectangular meshes from inside to outside, a radial rectangular (the length-width ratio is 3: 1) woven mesh shearing aeration layer (made by weaving metal stainless steel wires) with the equivalent diameter of 150 mu m of rectangular meshes and a metal powder sintered round hole shearing aeration layer (made by sintering metal titanium powder) with the equivalent diameter of 10 mu m of round holes; CO 22The air is sheared by a three-layer staggered variable-aperture structure of the aerator to finally form micron-sized bubbles with the diameter of 2.5 mm.
The whole microalgae culture system comprises CO2A supply system, a carbon supply system, a microalgae cultivation and harvesting system and a circulating water return system. (1) CO 22Supply system from CO2The storage tank provides high purity CO of 99.9% purity2Gas (derived from CO in flue gas of industrial furnace2Obtained by separation and purification), sequentially passes through CO2The flow meter, the dryer, the check valve and the ball valve enter an aerator arranged inside the horizontal tank. (2) The carbon supplementing system comprises three layers of staggered variable-aperture shearing aerators, a horizontal tank, a pressure gauge and a sewage outlet. CO produced by aerator2Microbubbles and supplement with nutritive salt Na2CO3(the concentration is controlled to be 8g/L), circulating backwater is mixed, the internal pressure of the horizontal tank is controlled to be kept at 0.2MPa, and carbonation reaction is carried out to form NaHCO3. (3) With CO produced by the aerator2Carrying out carbonation reaction on the microbubbles to generate NaHCO3The circulating backwater is sent into a circulating backwater pool through a pipeline for temporary storage, or is directly sent into a runway pool photosynthetic reactor for cultivating microalgae (the algae are the spirulina platensis). The ambient light intensity is controlled to be 4000lux, the ambient temperature is controlled to be 18 ℃, and the pH value of the solution is controlled to be 8. Adjusting CO introduced into the aerator according to the pH value of the algae liquid in the photosynthetic reactor of the raceway pond2Gas flow or nutrient salt Na control2CO3To adjust the amount of NaHCO produced in the circulating backwater3Concentration, thereby promoting the photosynthesis of the microalgae to grow and fix carbon. After growing for 3 days, the microalgae are sent into microalgae biomass harvesting equipment for harvesting. (4) Sending the circulating backwater after harvesting the biomass into a waste liquid pool, processing and supplementing and adding nutritive salt Na2CO3And the circulating backwater passes through a water pump and a liquid flowmeter and is sent into a horizontal tank of the carbon supplementing system for recycling.
Compared with the traditional rubber strip porous aerator widely used in industry, the service life of the metal aerator is prolonged by 6 times, the bubble generation diameter is reduced by 69.3 percent to 2.5mm, the bubble generation time is reduced by 48.6 percent to 5.9s, and CO is generated2The mixing time of the bubbles and the liquid is reduced by 43 percent, the gas-liquid mass transfer efficiency is improved by 45 percent, and therefore, CO is enabled to be2Formation of NaHCO by carbonation reaction3The conversion efficiency of (2) is improved to 82.3%. The conventional rubber strip porous aerator is arranged in the raceway pond for direct CO2Compared with the aeration algae-cultivating system, the practical photochemical efficiency of the photosynthesis in the microalgae cell of the system is improved by 1.9 times, the biomass yield is improved by 45 percent, and the CO is increased by 45 percent2The utilization efficiency of the biomass from gas conversion to algae powder is improved by 3.9 times.
Finally, it should be noted that the above-mentioned embodiments illustrate only specific embodiments of the invention. Obviously, the present invention is not limited to the above embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the invention should be considered as within the scope of the invention.
Claims (5)
1. A three-layer staggered variable-aperture shearing aerator comprises a circular tubular main body with one open end and the other closed end; the circular tube-shaped body is characterized in that the circular tube-shaped body is provided with a three-layer structure in the radial direction, and the three-layer structure sequentially comprises an axial rectangular woven mesh shearing aeration layer, a radial rectangular woven mesh shearing aeration layer and a metal powder sintering circular hole shearing aeration layer from inside to outside; or the radial rectangular woven mesh shearing aeration layer, the axial rectangular woven mesh shearing aeration layer and the metal powder sintering round hole shearing aeration layer are sequentially arranged from inside to outside;
in the axial rectangular mesh grid shearing aeration layer and the radial rectangular mesh grid shearing aeration layer, the length-width ratio of rectangular meshes is 3-5: 1, and the area equivalent is a round hole with the diameter of 150 mu m; the long sides of the rectangular meshes of the two-layer structure are mutually vertical and are arranged in a staggered way; on the metal powder sintering round hole shearing aeration layer, the diameter of the round hole is equivalent to 10-100 mu m; the distance between every two adjacent layers of structures is 30-60 mu m.
2. The three-layer staggered variable aperture shear aerator of claim 1, wherein the axial rectangular woven mesh shear aeration layer and the radial rectangular woven mesh shear aeration layer are both made of metal stainless steel wires; the metal powder sintered round hole shearing aeration layer is made by sintering metal titanium powder.
3. The aerator of claim 1, wherein the circular tubular body has a length of 0.8 to 1.5m and an innermost structure diameter of 50 mm.
4. A microalgae cultivation system constructed by the three-layer staggered variable-aperture shear aerator of claim 1, comprising CO2The system comprises a supply system, a carbon supplementing system, a microalgae cultivation and harvesting system and a circulating water return system; the system is characterized in that the carbon supplementing system comprises a horizontal tank which is connected with a circulating water return pipeline of a circulating water return system through a top inlet and a bottom outlet of the horizontal tank; the three-layer staggered variable-aperture shear aerator is horizontally arranged in the horizontal tank, and the open end of the aerator is connected to CO through a pipeline2And a supply system constituting a carbon supply system.
5. The microalgae cultivation system of claim 4, wherein the CO is2The supply system comprises sequentially connected CO via pipeline2Storage tank, CO2Flow meters, dryers, check valves, and ball valves.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111747545A (en) * | 2020-07-08 | 2020-10-09 | 浙江大学 | Three-layer staggered variable-aperture shearing aerator and method for cultivating microalgae by circulating backwater thereof |
| CN116200261A (en) * | 2023-03-10 | 2023-06-02 | 广东能源集团科学技术研究院有限公司 | Aeration pipe and aerator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111747545A (en) * | 2020-07-08 | 2020-10-09 | 浙江大学 | Three-layer staggered variable-aperture shearing aerator and method for cultivating microalgae by circulating backwater thereof |
| CN111747545B (en) * | 2020-07-08 | 2024-06-14 | 浙江大学 | Three-layer staggered type aperture-variable shear aerator and method for cultivating microalgae by circulating backwater thereof |
| CN116200261A (en) * | 2023-03-10 | 2023-06-02 | 广东能源集团科学技术研究院有限公司 | Aeration pipe and aerator |
| CN116200261B (en) * | 2023-03-10 | 2024-03-29 | 广东能源集团科学技术研究院有限公司 | Aeration pipe and aerator |
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