Energy conversion system using microalgae

Abstract

The invention relates to the technical field of biomass resource utilization, and provides an energy conversion system using microalgae. The energy conversion system using the microalgae comprises a liquid supply device, a microalgae heating device, a sedimentation device and an anaerobic fermentation device which are connected in sequence, the microalgae heating device comprises a transparent heating pipe and a photovoltaic panel arranged around the heating pipe, the two ends of the heating pipe are communicated with the liquid supply device and the sedimentation device respectively, a light-transmitting notch allowing sunlight to penetrate through is formed in the photovoltaic panel, and the light-transmitting notch is opposite to the heating pipe in the radial direction of the heating pipe so that the sunlight can directly irradiate the heating pipe; the light source can penetrate through the heating pipe to irradiate the photovoltaic panel; the liquid supply device can convey a mixed liquid containing microalgae slurry and metal nanoparticles to the heating pipe; the settling device can settle and separate the metal nanoparticles and the microalgae slurry in the mixed liquid, and the separated microalgae slurry can be introduced into the anaerobic fermentation device, so that the anaerobic fermentation device can produce biogas. And the heating pipe, the photovoltaic panel and the metal nanoparticles cooperate with one another, so that the hydrothermal pretreatment efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of biomass resource utilization, and in particular to an energy conversion system using microalgae. Background Art

[0002] As environmental pollution becomes increasingly prevalent, the development of efficient, clean, and renewable energy technologies has become a global focus. Microalgae, a highly promising biomass resource, can be converted into biogas through anaerobic digestion. This biogas can be directly burned for energy or purified for power generation, thus achieving a carbon-neutral energy cycle.

[0003] However, microalgae have cell walls, which prevent hydrolytic enzymes from effectively accessing the organic matter within the cells during anaerobic digestion. Therefore, hydrothermal pretreatment is required to destroy the microalgae cell walls, exposing internal functional groups to increase active sites and improve biogas production during subsequent anaerobic digestion. To reduce energy consumption, existing technologies use direct sunlight to heat the microalgae slurry. However, existing light heating devices have low light energy utilization and slow heating speed, limiting the efficiency of energy systems using microalgae conversion. Summary of the Invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides an energy conversion system using microalgae.

[0005] The present application provides an energy conversion system using microalgae, comprising a liquid supply device, a microalgae heating device, a sedimentation device and an anaerobic fermentation device connected in sequence;

[0006] The microalgae heating device includes a transparent heating tube and a photovoltaic panel arranged around the heating tube. The two ends of the heating tube are respectively connected to the liquid supply device and the sedimentation device. The photovoltaic panel is formed with a light-transmitting notch for sunlight to pass through. The light-transmitting notch is opposite to the heating tube in the radial direction of the heating tube, so that sunlight can directly hit the heating tube and pass through the heating tube to illuminate the photovoltaic panel.

[0007] The liquid supply device can transport a mixed liquid including microalgae slurry and metal nanoparticles to the heating pipe; the sedimentation device can sediment and separate the metal nanoparticles and the microalgae slurry in the mixed liquid, and the separated microalgae slurry can be passed into the anaerobic fermentation device to enable the anaerobic fermentation device to produce biogas.

[0008] Optionally, the microalgae heating device further comprises an outer sleeve, which is coaxially sleeved on the outside of the heating tube, the photovoltaic panel is fixedly connected to the inner wall of the outer sleeve, and the outer sleeve is light-transmissive at least in the area opposite to the light-transmitting notch; the heating tube is sealedly connected to the outer sleeve, and there is a vacuum between the heating tube and the outer sleeve.

[0009] Optionally, the microalgae heating device further comprises an arc-shaped light-collecting plate, which is arranged outside the heating tube and is spaced apart from the heating tube, and the concave surface of the arc-shaped light-collecting plate faces the light-transmitting gap, and the arc-shaped light-collecting plate can reflect the scattered sunlight into the light-transmitting gap.

[0010] Optionally, the photovoltaic panel is an arc-shaped panel extending along the circumference of the heating tube, and the corresponding circular angle of the photovoltaic panel is less than or equal to 180 degrees.

[0011] The two side edges of the photovoltaic panel along the circumference of the heating tube are spaced apart from each other to form the light-transmitting gap, so that the light-transmitting gap extends along the axial direction of the heating tube.

[0012] Optionally, the metal nanoparticles include silver nanoparticles.

[0013] Optionally, the sedimentation device comprises a centrifugal sedimentation machine, which is in communication with the heating tube and the anaerobic fermentation device, the mixed solution can be introduced into the centrifugal sedimentation machine, the centrifugal sedimentation machine can drive the movement of the mixed solution, so that the microalgae slurry and the metal nanoparticles in the mixed solution are stratified, and the mixed solution can transport the microalgae slurry to the anaerobic fermentation device through the centrifugal sedimentation machine.

[0014] Optionally, the energy conversion system using microalgae further comprises a biogas power generation device, the biogas power generation device comprises a purification device and an electrochemical reaction device, the purification device is in communication with the anaerobic fermentation device, and the purification device can purify the biogas into methane.

[0015] The electrochemical reaction device comprises a reformer in communication with the purification device, a reaction cavity in communication with the reformer, and an external circuit, the reaction cavity is provided with an anode, a cathode, and an electrolyte, the anode and the cathode are electrically connected through the electrolyte, the external circuit is electrically connected with the anode and the cathode, and the external circuit is used to be electrically connected with an electrical appliance.

[0016] The purification device can input the methane into the reformer, and the methane can react in the reformer to generate a synthesis gas comprising hydrogen and carbon monoxide.

[0017] The reformer can input the synthesis gas into the reaction cavity, the synthesis gas can undergo an oxidation reaction at the anode, and a reduction reaction with oxygen can occur at the cathode, so that the anode, the cathode, the electrolyte, the external circuit, and the electrical appliance can form a closed loop for electron movement.

[0018] Optionally, the electrochemical reaction device further comprises a first heat exchanger, a second heat exchanger, a third heat exchanger, and a combustion chamber.

[0019] The first heat exchanger is connected between the purification device and the reformer to preheat the methane entering the reformer; the second heat exchanger is connected between the reformer and the outside air to preheat the air entering the reformer; the third heat exchanger is connected between the reaction chamber and the air to preheat the air entering the reaction chamber;

[0020] The first heat exchanger, the second heat exchanger and the third heat exchanger are all connected to the combustion chamber. The combustion chamber is arranged outside the reaction chamber and is connected to the reaction chamber, and is used to burn unreacted synthesis gas and air in the reaction chamber so that the gas generated in the combustion chamber can exchange heat with the first heat exchanger, the second heat exchanger and the third heat exchanger.

[0021] Optionally, the energy conversion system using microalgae also includes a temperature control device, which is electrically connected to the liquid supply device and can detect the temperature of the mixed liquid in the heating tube. The temperature control device can control the liquid supply speed of the liquid supply device according to the temperature of the mixed liquid in the heating tube.

[0022] Optionally, the liquid supply device includes a delivery pump, and the temperature control device includes a controller and a temperature sensor. The temperature sensor is installed on the heating tube, and the detection end of the temperature sensor extends to the interior of the heating tube. The controller is electrically connected to the delivery pump and the temperature sensor. The controller can control the working power of the delivery pump according to the detection data of the temperature sensor.

[0023] The technical solution provided by this application has the following advantages compared with the existing technology:

[0024] In the energy conversion system using microalgae provided in the embodiment of the present application, sunlight directly illuminates the heating tube through the light-transmitting gap, and the mixed liquid absorbs the energy of a part of the light band to achieve initial temperature increase; the remaining light not absorbed by the mixed liquid penetrates the heating tube and illuminates the photovoltaic panel, which on the one hand converts the light energy into electrical energy for use by the system, and on the other hand, the photovoltaic panel generates heat due to its own heat, which is transferred back to the heating tube to assist in heating the mixed liquid; and the metal nanoparticles added to the mixed liquid enhance the mixed liquid's absorption of a part of the light band and the heat generation through the localized surface plasmon resonance effect. The microalgae heating device utilizes the full spectrum of sunlight to rapidly heat the mixed liquid. The heating of the microalgae slurry within the heating tube exposes the functional groups within the microalgae. After heating, the mixed liquid passes through a sedimentation device to rapidly separate the metal nanoparticles from the microalgae slurry. The separated microalgae slurry is then fed into an anaerobic fermentation unit, ensuring that anaerobic bacteria there efficiently utilize the exposed functional groups to metabolize and produce biogas. The heating tube, photovoltaic panel, and metal nanoparticles work together to accelerate the heating of the microalgae slurry, shorten the hydrothermal pretreatment time for the microalgae, and improve the efficiency of the energy conversion system using microalgae. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 This is a schematic diagram of the structure of the energy conversion system using microalgae described in the examples of this application;

[0028] Figure 2 This is a schematic structural diagram of the electrochemical reaction device described in an embodiment of the present application;

[0029] Figure 3 This is a schematic structural diagram of the microalgae heating device described in an embodiment of the present application;

[0030] Figure 4 This is a schematic diagram of the assembly structure of the heating tube and the outer sleeve according to the embodiment of the present application;

[0031] Figure 5 This is a schematic structural diagram of the photovoltaic panel described in an embodiment of the present application.

[0032] Among them, 1. Liquid supply device; 2. Microalgae heating device; 21. Heating tube; 22. Photovoltaic panel; 221. Light-transmitting gap; 23. Outer sleeve; 24. Arc-shaped concentrating plate; 3. Sedimentation device; 4. Anaerobic fermentation device; 5. Biogas power generation device; 51. Purification device; 52. Electrochemical reaction device; 521. Reformer; 522. Reaction chamber; 523. External circuit; 524. Anode; 525. Cathode; 526. Electrolyte; 53. First heat exchanger; 54. Second heat exchanger; 55. Third heat exchanger; 56. Combustion chamber; 6. Electrical appliances. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application can also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present application, not all of the embodiments.

[0035] Reference Figures 1 to 5 As shown, an embodiment of the present application provides an energy conversion system using microalgae, comprising a liquid supply device 1, a microalgae heating device 2, a sedimentation device 3 and an anaerobic fermentation device 4 connected in sequence; the microalgae heating device 2 comprises a transparent heating tube 21 and a photovoltaic panel 22 arranged around the heating tube 21, the two ends of the heating tube 21 are respectively connected to the liquid supply device 1 and the sedimentation device 3, and a light-transmitting gap 221 is formed on the photovoltaic panel 22 for sunlight to pass through. The light-transmitting gap 221 is opposite to the heating tube 21 along the radial direction of the heating tube 21, so that sunlight can directly hit the heating tube 21 and can pass through the heating tube 21 to illuminate the photovoltaic panel 22; the liquid supply device 1 can transport a mixed liquid including microalgae slurry and metal nanoparticles to the heating tube 21; the sedimentation device 3 can sediment and separate the metal nanoparticles and microalgae slurry in the mixed liquid, and the separated microalgae slurry can be passed into the anaerobic fermentation device 4, so that the anaerobic fermentation device 4 produces biogas.

[0036] Specifically, the liquid supply device can include a liquid storage tank with a stirring function. The liquid storage tank has a built-in propeller stirrer for uniformly mixing the microalgae slurry (aqueous solution containing microalgae cells) and the metal nanoparticles (e.g., silver nanoparticles). The outlet of the liquid storage tank is connected to the inlet of the heating pipe 21 of the microalgae heating device 2 via a corrosion-resistant pipe.

[0037] The heating tube 21 can be made of a glass tube or a transparent quartz tube. The interior of the heating tube 21 is hollow, allowing the mixture of microalgae pulp and metal nanoparticles to flow inside the heating tube 21. When sunlight shines on the heating tube 21, the sunlight penetrates the heating tube 21 and shines into the mixture. The microalgae pulp can absorb the ultraviolet (UV) and infrared (IR) rays in the sunlight and increase the temperature. The metal nanoparticles have excellent light-to-heat conversion capabilities. Through the localized surface plasmon resonance effect, the metal nanoparticles increase the efficiency of converting the absorbed light energy into heat energy, thereby significantly increasing the heating rate of the mixture. This allows the metal nanoparticles to efficiently absorb light energy and convert it into heat energy, promoting the destruction of the microalgae cell walls.

[0038] The above-mentioned photovoltaic panel 22 can be selected to extend along the circumference of the heating tube 21, and the photovoltaic panel 22 is spaced apart along the two side edges of the circumference of the heating tube 21 to form a light-transmitting gap 221; the photovoltaic panel 22 is arranged on the outside of the heating tube 21, and the projection of the photovoltaic panel 22 on the outer wall of the heating tube 21 is a covering surface, and the center angle corresponding to the covering surface on the heating tube 21 can be selected to be between 60 degrees and 180 degrees.

[0039] Sunlight passes through the light-transmitting gap 221 and directly shines on the heating tube 21. Then the sunlight passes through the heating tube 21 and the mixed liquid in the heating tube 21 and shines on the photovoltaic panel 22. After the sunlight passes through the heating tube 21, the light in the sunlight that is not absorbed by the mixed liquid is transmitted to the photovoltaic panel 22, causing the photovoltaic panel 22 to generate electricity.

[0040] A valve may be optionally provided between the heating pipe 21 and the settling device 3 to increase the temperature of the mixed liquid in the heating pipe 21 and perform hydrothermal pretreatment on the microalgae in the microalgae slurry; after the mixed liquid is heated in the heating pipe 21 for a period of time, it is passed into the settling device 3 to separate the mixed liquid.

[0041] The microalgae slurry and metal nanoparticles absorb sunlight energy, raising the temperature of the mixed liquid. The photovoltaic panels 22 also generate heat as they generate electricity. This heat is radiated onto the heating tube 21, helping to raise the temperature of the mixed liquid within the heating tube 21. The heated mixed liquid destroys the cell walls of the microalgae, exposing functional groups within the microalgae. This increases the number of active sites on the microalgae's surface, thereby increasing the amount and efficiency of biogas production in the anaerobic fermentation device.

[0042] The above-mentioned sedimentation device 3 can be selected to adopt a centrifugal sedimentation machine, which includes a centrifugal cylinder and a rotating drum arranged in the centrifugal cylinder. The mixed liquid is passed into the centrifugal cylinder, and the drum rotates to drive the mixed liquid to rotate, so that the mixed liquid can be stratified, and the microalgae slurry and metal nanoparticles are stratified and settled, and the microalgae slurry in the stratified mixed liquid is passed into the anaerobic fermentation device 4; of course, the sedimentation device 3 can also be selected as a sedimentation tank, and a magnetic layer is provided on the inner wall of the sedimentation tank. After the mixed liquid is passed into the sedimentation tank, the metal nanoparticles are adsorbed on the magnetic layer, and the microalgae slurry is introduced into the anaerobic fermentation device 4 through the conduit provided at the notch of the sedimentation tank.

[0043] The above-mentioned anaerobic fermentation device 4 can be selected as a closed reactor with a multi-layer biofilm carrier inside. Anaerobic bacteria are set on the biofilm carrier. After the microalgae are introduced into the reactor, the anaerobic bacteria use the organic matter of the microalgae to produce biogas; the reactor is connected to a collection pipe so that the collection pipe can collect the biogas produced by the anaerobic bacteria in the reactor.

[0044] Above-mentioned microalgae cell wall is usually made of cellulose, hemicellulose or complex polysaccharide such as chitin, is difficult to be directly decomposed by anaerobic microorganism under natural state.So microalgae needs to carry out hydrothermal pretreatment when entering anaerobic fermentation device 4, that is, microalgae is heated to 120 degree to 160 degree to destroy the operation of cell wall.Mixed liquor is after microalgae heating device 2, and microalgae slurry is heated in heating tube 21 to carry out hydrothermal pretreatment, destroys the cell wall of microalgae, the functional groups inside microalgae in microalgae slurry are exposed, organic substances such as lipid, protein, polysaccharide in microalgae cell are released in liquid phase, are converted into soluble organic matter such as monosaccharide, amino acid, short-chain fatty acid etc. that are more easily utilized by microorganism, promote the amount that the anaerobic bacteria in anaerobic fermentation device 4 produces biogas.

[0045] The electricity generated by the photovoltaic panels 22 can be used to power the electrical appliances 6 , and the biogas generated by the anaerobic fermentation device 4 can be used as fuel for users, or the biogas can be used to generate electricity to power the electrical appliances 6 .

[0046] When the energy conversion system using microalgae provided in the embodiment of the present application is used, a mixed liquid of microalgae slurry and metal nanoparticles is filled into the liquid supply device 1, and the liquid supply device 1 transports the mixed liquid relative to the heating tube 21. Sunlight is irradiated to the heating tube 21 through the light-transmitting gap 221. The mixed liquid in the heating tube 21 absorbs part of the sunlight to increase the temperature. After passing through the heating tube 21, the sunlight is irradiated onto the photovoltaic panel 22, causing the photovoltaic panel 22 to absorb the remaining light and generate electricity.

[0047] The mixed liquid is heated within heating tube 21 for hydrothermal pretreatment, damaging the cell walls of the microalgae in the microalgae slurry and exposing their functional groups. The hydrothermally pretreated mixed liquid is then passed into settling device 3 for sedimentation and stratification. The microalgae slurry in the mixed liquid is then passed into anaerobic fermentation device 4, where anaerobic bacteria utilize the functional groups in the microalgae slurry to produce biogas. The electricity generated by photovoltaic panels 22 can power electrical appliances 6, and the biogas produced by anaerobic fermentation device 4 can be used as fuel for users, or it can be used to generate electricity to power electrical appliances 6.

[0048] In the energy conversion system using microalgae provided in the embodiment of the present application, sunlight directly illuminates the heating tube 21 through the light-transmitting gap 221, and the mixed liquid absorbs the energy of a part of the light band to achieve initial temperature increase; the remaining light not absorbed by the mixed liquid penetrates the heating tube 21 and illuminates the photovoltaic panel 22, which on the one hand converts the light energy into electrical energy for use by the system; on the other hand, the photovoltaic panel 22 generates heat due to its own heat, which is transferred back to the heating tube 21 to assist in heating the mixed liquid; and the metal nanoparticles added to the mixed liquid enhance the absorption of the mixed liquid for a part of the light band and the heat generated by the mixed liquid through the localized surface plasmon resonance effect. Thermal conversion increases the heating rate of the mixed liquid. Through directional light transmission through the light-transmitting notch 221, waste heat recovery from the photovoltaic panel 22, and multi-stage utilization of the localized surface plasmon resonance effect of metal nanoparticles, the microalgae heating device 2 utilizes the full spectrum of sunlight to rapidly heat the mixed liquid. Heating the microalgae slurry within the heating tube 21 exposes the functional groups within the microalgae. After heating, the mixed liquid passes through the sedimentation device 3 to rapidly separate the metal nanoparticles from the microalgae slurry. The separated microalgae slurry is then passed into the anaerobic fermentation device 4, ensuring that anaerobic bacteria there efficiently utilize the exposed functional groups of the microalgae for metabolism and biogas production. The synergistic effect of the heating tube 21, photovoltaic panel 22, and metal nanoparticles accelerates the heating rate of the microalgae slurry, shortens the hydrothermal pretreatment time of the microalgae, and improves the efficiency of the energy conversion system using microalgae.

[0049] Reference Figure 3 and Figure 4 As shown, in some embodiments, the microalgae heating device 2 further includes an outer sleeve 23, which is coaxially sleeved on the outside of the heating tube 21, and the photovoltaic panel 22 is fixedly connected to the inner wall of the outer sleeve 23. The outer sleeve 23 is light-transmissive at least in the area opposite to the light-transmitting notch 221; the heating tube 21 is sealed with the outer sleeve 23, and there is a vacuum between the heating tube 21 and the outer sleeve 23.

[0050] With this arrangement, sunlight shines on the heating tube 21, raising the temperature of the mixed liquid. Heat generated by the photovoltaic panel 22 is transferred to the heating tube 21 through radiation, raising the temperature of the mixed liquid. The outer sleeve 23 and the heating tube 21 are in a vacuum state, isolating heat convection between the heating tube 21 and the outer sleeve 23, thereby reducing heat loss from the heating tube 21. The outer sleeve 23 also protects the photovoltaic panel 22 from external corrosion, extending its service life.

[0051] Specifically, the outer sleeve 23 can be a hollow glass tube and is placed outside the heating tube 21. The outer sleeve 23 and the heating tube 21 are fixed by an annular sealing ring, and an exhaust device is used to extract the air between the outer sleeve 23 and the heating tube 21 to form a vacuum layer between the outer sleeve 23 and the heating tube 21. The area of ​​the outer sleeve 23 opposite the light-transmitting notch 221 can be made of a transparent material, such as glass or quartz; of course, the outer sleeve 23 can also be made of a transparent material.

[0052] The photovoltaic panel 22 can be attached to the inner wall of the outer sleeve 23 using a thermally conductive adhesive. The photovoltaic panel 22 can be an arc-shaped panel, and the central angle corresponding to the arc of the photovoltaic panel 22 can be less than or equal to 180 degrees. The light-transmitting notch 221 is formed on the inner wall of the outer sleeve 23. The electricity generated by the photovoltaic panel 22 can be connected to the sedimentation device 3 via a wire, so that the electricity generated by the photovoltaic panel 22 can power the centrifugal sedimentator of the sedimentation device 3.

[0053] Reference Figure 3 and Figure 4 As shown, in some embodiments, the microalgae heating device 2 further includes an arc-shaped focusing plate 24, which is arranged on the outside of the heating tube 21 and spaced apart from the heating tube 21. The concave surface of the arc-shaped focusing plate 24 faces the light-transmitting gap 221, and the arc-shaped focusing plate 24 can reflect scattered sunlight into the light-transmitting gap 221.

[0054] With this arrangement, the arc-shaped concentrating plate 24 can collect sunlight to enter the light-transmitting opening 221 , so that the collected sunlight can irradiate the heating tube 21 , thereby accelerating the heating speed of the mixed liquid in the heating tube 21 .

[0055] Specifically, the curved concentrator plate 24 is disposed outside the heating tube 21. The curved concentrator plate 24 curves radially away from the heating tube 21, and the radius of curvature of the curved concentrator plate 24 matches that of the heating tube 21. The side of the curved concentrator plate 24 facing the heating tube 21 is polished to reflect light, serving as a reflective surface. The reflective surface is curved, and its focal point is at the light-transmitting notch 221. Sunlight striking the reflective surface is reflected and passes through the light-transmitting notch 221.

[0056] The arc-shaped focusing plate 24 can be fixed to the outside of the outer sleeve 23 through a bracket to reflect scattered sunlight to the light-transmitting gap 221, so that the sunlight is concentrated on the heating tube 21 to increase the temperature of the heating tube 21.

[0057] Reference Figure 1 and Figure 5 As shown, in some embodiments, the photovoltaic panel 22 is an arc-shaped plate extending along the circumference of the heating tube 21, and the circular angle corresponding to the photovoltaic panel 22 is less than or equal to 180 degrees; the two side edges of the photovoltaic panel 22 along the circumference of the heating tube 21 are spaced apart from each other to form a light-transmitting gap 221, so that the light-transmitting gap 221 extends along the axial direction of the heating tube 21.

[0058] With such an arrangement, the photovoltaic panel 22 can cover at most half of the outer wall of the heating tube 21, avoiding the reduction of the amount of light that can reach the heating tube 21 due to the smaller size of the light-transmitting gap 221, so that the photovoltaic panel 22 can maximize the power generation efficiency within a limited coverage area. At the same time, the light-transmitting gap 221 ensures sufficient sunlight to directly heat the mixed liquid; and the position of the sun is different at different times of the day, so that the angle of sunlight irradiating the heating tube 21 is constantly changing. The larger size of the light-transmitting gap 221 can avoid excessive blocking of the photovoltaic panel 22, thereby improving the utilization rate of sunlight.

[0059] Specifically, the photovoltaic panel 22 can be made of single crystal silicon material, and the photovoltaic panel 22 is processed into an arc-shaped plate coaxial with the heating tube 21. The central angle of the arc can be selected between 120 degrees and 180 degrees, and the central angle of the arc is preferably 135 degrees.

[0060] The above-mentioned photovoltaic panel 22 extends along the axial direction of the heating tube 21, so that the photovoltaic panel 22 can cover the heating tube 21 at various axial positions thereof. The light-transmitting gap 221 is formed by the two side edges of the photovoltaic panel 22, so that the light-transmitting gap 221 also extends along the axial direction of the heating tube 21, so that sunlight can pass through the light-transmitting gap 221 and illuminate the heating tube 21 at various axial positions thereof.

[0061] Reference Figure 1 and Figure 5 As shown, in some embodiments, the metal nanoparticles include silver nanoparticles.

[0062] With this arrangement, the silver nanoparticles can convert absorbed light energy into heat through the localized surface plasmon resonance effect, significantly increasing the heating rate of the mixed liquid. Furthermore, the silver nanoparticles have antibacterial properties, which can inhibit the growth of bacteria within the heating tube 21, preventing microalgae from biocontamination during the hydrothermal pretreatment process.

[0063] Specifically, the silver nanoparticles can be selected as particles with a particle size of 20-50 nm. The concentration of the silver nanoparticles in the mixed solution can be selected as 0.1-0.5 wt%. The supply device 1 is provided with a nanoparticle inlet, and an ultrasonic vibrator is arranged on the nanoparticle inlet. The silver nanoparticles enter the microalgae slurry through the nanoparticle inlet, and the ultrasonic vibrator can drive the silver nanoparticles to vibrate, so that the silver nanoparticles are uniformly dispersed in the microalgae slurry.

[0064] The silver nanoparticles have a localized surface plasmon resonance effect. Localized surface plasmon resonance (LSPR) refers to that when light is incident on the nanoparticles composed of metal, if the incident photon frequency matches the overall vibration frequency of the metal nanoparticles or metal conduction electrons, the nanoparticles or metal will have a strong absorption effect on the photon energy, and at this time a strong resonance absorption peak will appear on the spectrum. The silver nanoparticles enhance the light absorption efficiency of the mixed solution through the localized surface plasmon resonance effect, thereby improving the heating rate of the mixed solution.

[0065] Referring to Figs. 1-2, Figure 1 and Figure 4 In some embodiments, the settling device 3 includes a centrifugal settler, which is in communication with the heating tube 21 and the anaerobic fermentation device 4. The mixed solution can be introduced into the centrifugal settler, and the centrifugal settler can drive the mixed solution to move, so that the microalgae slurry and the metal nanoparticles in the mixed solution are stratified, and the mixed solution can deliver the microalgae slurry to the anaerobic fermentation device 4 through the centrifugal settler.

[0066] In this way, the centrifugal settler can conveniently separate the mixed solution, and avoid the influence of the metal nanoparticles on the activity of the methanogens in the anaerobic fermentation device 4.

[0067] Specifically, the centrifugal settler includes a centrifugal cylinder and a rotating drum, and the rotating drum is arranged in the centrifugal cylinder. The centrifugal cylinder is provided with a liquid phase port in the middle part and a solid phase port near the edge. The mixed solution is introduced into the centrifugal cylinder, and the high-speed rotation of the rotating drum drives the mixed solution to rotate. Due to the difference in specific gravity between the metal nanoparticles and the microalgae slurry, they will produce different centrifugal inertia forces. Therefore, the metal nanoparticles with large centrifugal force will deposit on the inner wall of the rotating drum, while the microalgae slurry will settle in the middle part of the centrifugal cylinder, and the microalgae slurry can be discharged from the centrifugal cylinder through the liquid phase port and then introduced into the anaerobic fermentation device 4.

[0068] The above-mentioned centrifugal settler can be selected as a vertical settler or a horizontal settler. The rotating drum of the vertical settler has a vertical shaft, and the rotating drum of the horizontal settler has a shaft arranged in the horizontal direction. As long as the mixed solution can be stratified into the metal nanoparticles and the microalgae slurry through the centrifugal settler, and the microalgae slurry can be introduced into the anaerobic fermentation device 4.

[0069] The centrifuge tube may optionally be equipped with a magnet on the outside of the channel corresponding to the metal nanoparticle collection channel. The magnet can attract the metal nanoparticles, facilitating collection of the separated metal nanoparticles. Alternatively, the inner wall of the centrifuge tube may be provided with a metal adsorption layer, such as a magnetic material, to separate the metal nanoparticles from the mixed liquid. As the mixed liquid rotates and separates into layers within the centrifuge tube, the metal nanoparticles migrate to the tube wall and are adsorbed on the metal adsorption layer, thereby rapidly separating the metal nanoparticles from the microalgae slurry.

[0070] Reference Figure 1 and Figure 2 As shown, in some embodiments, the energy conversion system using microalgae further includes a biogas power generation device 5, which includes a purification device 51 and an electrochemical reaction device 52. The purification device 51 is connected to the anaerobic fermentation device 4 and can purify biogas into methane; the electrochemical reaction device 52 includes a reformer 521 connected to the purification device 51, a reaction chamber 522 connected to the reformer 521, and an external circuit 523. The reaction chamber 522 is provided with an anode 524, a cathode 525, and an electrolyte 526. The anode 524 and the cathode 525 are electrically connected through the electrolyte 526. The external circuit 523 is electrically connected to the anode 524 and the cathode 525, and the external circuit 523 is used to be electrically connected to the electrical appliance 6; the purification device 51 can input methane into the reformer 521, and the methane can react in the reformer 521 to generate a synthesis gas including hydrogen and carbon monoxide; the reformer 521 can input the synthesis gas into the reaction chamber 522, and the synthesis gas can undergo an oxidation reaction at the anode 524 and undergo a reduction reaction with oxygen at the cathode 525, so that the anode 524, the cathode 525, the electrolyte 526, the external circuit 523 and the electrical appliance 6 can form a closed loop for the movement of electrons.

[0071] With this arrangement, the synthesis gas is integrated into the reaction chamber 522 to generate an electrochemical reaction to generate electricity, thus avoiding the step of separating the hydrogen in the synthesizer and reducing the complexity of the reaction system for generating electricity using methane.

[0072] Specifically, purification device 51 can be a pressure swing adsorption tower filled with a composite adsorbent of activated carbon and molecular sieves to selectively adsorb impurities such as CO2 and H2S. This ensures that the primary component of the gas output from purification device 51 is methane. If the volume proportion of methane in the gas output from purification device 51 is greater than or equal to 95%, the biogas can be considered to be purified into methane after passing through purification device 51. The purified methane can be optionally transported to electrochemical reaction device 52 via a pressure reducing valve.

[0073] The reformer 521 is a cylinder with a heating function. Methane reacts with the steam reformer 521 at 800°C to 900°C. The reaction formula is:

[0074] CH4+H2O→CO+3H2

[0075] The mixed gas of carbon monoxide and hydrogen produced in the reformer 521 is synthesis gas.

[0076] The reaction chamber 522 has a shell that accommodates a cathode 525, an anode 524, and an electrolyte 526. Two wires are connected to the shell, and the two wires are electrically connected to the cathode 525 and the anode 524 respectively. The two wires constitute an external circuit 523, and the reaction chamber 522 is a solid oxide fuel cell (SOFC).

[0077] The electrolyte 526 may be yttrium-stabilized zirconia (YSZ), the anode 524 may be nickel-YSZ ceramic, and the cathode 525 may be lanthanum-strontium-cobalt-iron (LSCF) perovskite material.

[0078] After the synthesis gas is introduced into the reaction chamber 522, air is also introduced into the reaction chamber 522, and the synthesis gas undergoes an oxidation reaction around the anode 524. The reaction formula is:

[0079] H2+O 2- →H2O+2e -

[0080] CO+O 2- →CO2+2e -

[0081] That is, the synthesis gas reacts at the anode 524 to generate water, carbon dioxide and electrons;

[0082] Oxygen in the air undergoes a reduction reaction at the cathode 525, and the reaction formula is:

[0083] O 2 +4e - →2O 2-

[0084] Specifically, oxygen generates oxygen ions at cathode 525, which are then transferred to anode 524 via electrolyte 526. At anode 524, the oxygen ions react with the syngas, while electrons generated by anode 524 migrate to cathode 525 via external circuit 523. These electrons flow through external circuit 523 to cathode 525, powering electrical device 6 while simultaneously participating in the oxygen reduction reaction at cathode 525. Consequently, cathode 525, anode 524, electrolyte 526, and electrical device 6 form a closed loop via external circuit 523, enabling the reaction of syngas within reaction chamber 522 to power electrical device 6.

[0085] Reference Figure 1 and Figure 2As shown, in some embodiments, the electrochemical reaction device 52 further includes a first heat exchanger 53, a second heat exchanger 54, a third heat exchanger 55 and a combustion chamber 56; the first heat exchanger 53 is connected between the purification device 51 and the reformer 521 to preheat the methane passed into the reformer 521, and the second heat exchanger 54 is connected between the reformer 521 and the outside air to preheat the air passed into the reformer 521; the third heat exchanger 55 is connected between the reaction chamber 522 and the air to preheat the air passed into the reaction chamber 522; the first heat exchanger 53, the second heat exchanger 54 and the third heat exchanger 55 are all connected to the combustion chamber 56, and the combustion chamber 56 is arranged outside the reaction chamber 522 and is connected to the reaction chamber 522, and is used to burn the unreacted synthesis gas and air in the reaction chamber 522, so that the gas generated in the combustion chamber 56 can exchange heat with the first heat exchanger 53, the second heat exchanger 54 and the third heat exchanger 55.

[0086] In this arrangement, the combustion chamber utilizes the unreacted gas in the reaction chamber 522 to generate high-temperature gas, and the first heat exchanger 53, the second heat exchanger 54 and the third heat exchanger 55 can utilize the high-temperature gas in the combustion chamber to increase their own temperatures, so that the first heat exchanger 53, the second heat exchanger 54 and the third heat exchanger 55 complete the preheating operation, saving energy consumption when the electrochemical reaction device 52 is working.

[0087] Specifically, the combustion chamber can be selected to have a cavity, and the combustion chamber is connected to the reaction chamber 522 through a steel pipe. The first heat exchanger 53, the second heat exchanger 54 and the third heat exchanger 55 can be selected to have a main body, and a channel is provided on the main body so that air or synthesis gas can pass through the channel, and the main body has a heating chamber, and high-temperature gas can be selected to be introduced into the heating chamber to make the temperature of the main body higher and heat the synthesis gas and air.

[0088] When the methane enters the reformer 521 for reaction, the methane and the air entering the reformer 521 must be at a temperature of 150°C to allow the methane to successfully generate synthesis gas in the reformer 521. The temperatures of the first heat exchanger 53 and the second heat exchanger 54 can be selected to be greater than or equal to 150°C, so that the first heat exchanger 53 heats the methane entering the reformer 521, and the second heat exchanger 54 heats the air entering the reformer 521. The temperature within the reaction chamber 522 must be above 800°C. Using the third heat exchanger 55 to heat the air entering the reaction chamber 522 can prevent a rapid drop in the temperature within the reaction chamber 522.

[0089] The synthesis gas and air that do not react with the anode 524 in the reaction cavity 522 are introduced into the combustion chamber, and the synthesis gas and air are mixed and combusted in the combustion chamber to form exhaust gas mixed with water and carbon dioxide. The exhaust gas has a high temperature due to the combustion of the synthesis gas, and the high-temperature exhaust gas can flow into the heating cavities of the main bodies of the first heat exchanger 53, the second heat exchanger 54 and the third heat exchanger 55, respectively, so that the first heat exchanger 53, the second heat exchanger 54 and the third heat exchanger 55 are kept at a high temperature by using the high-temperature gas generated in the combustion chamber, thereby saving energy consumed by the synthesis gas introduced into the electrochemical reaction device 52 for power generation.

[0090] The first heat exchanger 53, the second heat exchanger 54 and the third heat exchanger 55 can be connected to air blowers, respectively, so that the air blowers can drive the synthesis gas to pass through the first heat exchanger 53 and be introduced into the reformer 521, the air to pass through the second heat exchanger 54 and be introduced into the reformer 521, and the air to pass through the third heat exchanger 55 and be introduced into the reaction cavity 522.

[0091] In some embodiments, the energy conversion system using microalgae further comprises a temperature control device, the temperature control device is electrically connected to the liquid supply device 1, and the temperature control device can detect the temperature of the mixed solution in the heating tube 21 and control the liquid supply speed of the liquid supply device 1 according to the temperature of the mixed solution in the heating tube 21.

[0092] In this way, the temperature control device can accurately adjust the flow speed of the mixed solution in the heating tube 21 to control the heating time of the mixed solution, so that the temperature of the mixed solution in the heating tube 21 can be kept in a stable range.

[0093] Specifically, the temperature control device can include a temperature sensor and a controller, the controller is electrically connected to the temperature sensor, and the controller is electrically connected to the liquid supply device 1. The temperature sensor can be a platinum resistance installed at the outlet of the heating tube 21. The controller can include a chip or a computer, and the liquid supply device 1 can include a delivery pump. The controller can receive a temperature signal and output a control signal to the delivery pump to control the power of the delivery pump and thereby control the delivery speed of the mixed solution.

[0094] Of course, the temperature control device can also have a display screen to display the temperature of the mixed solution in the heating tube 21, and the staff can manually adjust the delivery speed of the mixed solution of the liquid supply device 1 according to the temperature displayed on the display screen.

[0095] In some embodiments, the liquid supply device 1 includes a delivery pump, the temperature control device includes a controller and a temperature sensor, the temperature sensor is installed on the heating tube 21 and the detection end of the temperature sensor extends into the inside of the heating tube 21, and the controller is electrically connected to the delivery pump and the temperature sensor. The controller can control the working power of the delivery pump according to the detection data of the temperature sensor.

[0096] With this arrangement, the controller timely adjusts the working power of the delivery pump according to the detection data of the temperature sensor to adjust the heating time of the mixed liquid in the heating tube 21 so that the mixed liquid in the heating tube 21 can be within the set temperature range.

[0097] Specifically, the controller may include a chip or computer; the temperature sensor may include a platinum resistor, with the detection end of the platinum resistor embedded in the inner wall of the heating tube 21 so that the platinum resistor is in direct contact with the mixed liquid. Multiple temperature sensors may be arranged at equal intervals along the axial direction of the heating tube 21, and the detection data from the multiple temperature sensors is input into the controller through arithmetic averaging.

[0098] The delivery pump of the liquid supply device 1 pumps the mixed liquid into the heating tube 21. The delivery pump can be electrically connected to the controller through a wire. Of course, the delivery pump can also be selected to have a wireless model so that the delivery pump and the controller are electrically connected through a wireless connection. The set temperature range can be selected to be 120°C to 160°C, because the hydrolysis rate of microalgae is low at <120°C, and the reducing sugars and amino acids produced by the hydrolysis of microalgae are converted into melanoidins at 160°C.

[0099] It can be selected that when the temperature data detected by the temperature sensor is lower than 120°C, the working power of the delivery pump is reduced, the delivery speed of the mixed liquid is reduced, and the heating time of the mixed liquid in the heating tube 21 is increased to increase the temperature of the mixed liquid; when the temperature data detected by the temperature sensor is higher than 120°C, the working power of the delivery pump is increased, the delivery speed of the mixed liquid is increased, and the heating time of the mixed liquid in the heating tube 21 is reduced to reduce the temperature of the mixed liquid.

[0100] During the specific use of the energy conversion system using microalgae provided in the embodiments of the present application, some sunlight is reflected by the arc-shaped concentrating plate 24 and then enters the light-transmitting opening 221. Some sunlight then passes directly through the light-transmitting opening 221 and irradiates the heating tube 21. The liquid supply device 1 passes a mixture of microalgae slurry and silver nanoparticles into the heating tube 21. The mixture, acting as a heat transfer fluid, absorbs some of the sunlight in the heating tube 21, directly heating the mixture. The temperature control device adjusts the delivery pump to control the temperature of the mixture between 120°C and 160°C. Simultaneously, unabsorbed sunlight passes through the heating tube 21 and propagates to the photovoltaic panel 22. The photovoltaic panel 22 generates electricity and radiates heat to the heating tube 21, thereby assisting in heating the heating tube 21.

[0101] The microalgae slurry undergoes hydrothermal pretreatment in the heating tube 21. After the hydrothermal pretreatment, the cell walls of the microalgae are destroyed to expose the functional groups inside the microalgae. The mixed liquid is passed from the heating tube 21 into the centrifugal sedimentator. The drum of the centrifugal sedimentator rotates to separate the mixed liquid, allowing the microalgae slurry to pass from the centrifugal sedimentator into the anaerobic fermentation device 4. After the hydrothermal pretreatment, the microalgae enters the anaerobic digestion stage in the anaerobic fermentation device 4. The anaerobic digestion stage is generally divided into four stages: hydrolysis, acidification, acetogenesis, and methanogenesis. In the hydrolysis stage, macromolecular organic matter is broken down into small molecules, such as polysaccharides into monosaccharides, proteins into amino acids, and lipids into fatty acids. Then, in the acidification stage, these small molecules are converted into volatile fatty acids and alcohols. In the acetogenesis stage, these intermediates are converted into acetic acid, hydrogen, and carbon dioxide. Finally, the methanogens in the anaerobic fermentation device 4 use these substances to generate biogas.

[0102] The generated biogas is purified to produce methane through a purification device 51. A portion of the methane is mixed with ethane and carbon monoxide to form natural gas and delivered to users. The remaining portion enters the first heat exchanger 53 for preheating before entering the reformer 521. Simultaneously, air is preheated through the second heat exchanger 54 and also enters the reformer 521. Methane and carbon monoxide react within the reformer 521 to produce synthesis gas. This synthesis gas is then introduced into the reaction chamber 522, where it undergoes an oxidation reaction with the anode 524. Air then enters the reaction chamber 522 through the third heat exchanger 55, where it undergoes a reduction reaction with the cathode 525. The cathode 525, anode 524, and electrolyte 526 form a closed circuit with the electrical device 6 through the external circuit 523, allowing the electrochemical reaction within the reaction chamber 522 to power the electrical device 6. The unreacted synthesis gas and air in the reaction chamber 522 are merged into the combustion chamber, and the high-temperature exhaust gas coming out of the combustion chamber 56 then passes through the first heat exchanger 53, the second heat exchanger 54 and the third heat exchanger 55 in sequence, so that the high-temperature exhaust gas heats the first heat exchanger 53, the second heat exchanger 54 and the third heat exchanger 55.

[0103] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0104] The foregoing detailed description of the application has been presented for purposes of illustration and description. Various modifications to the description will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other implementations without departing from the spirit or scope of the application. Accordingly, the application is not intended to be limited to the embodiments described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An energy conversion system using microalgae, characterized in that: It comprises a liquid supply device (1), a microalgae heating device (2), a sedimentation device (3) and an anaerobic fermentation device (4) which are connected in sequence; The microalgae heating device (2) comprises a transparent heating tube (21) and a photovoltaic panel (22) arranged around the heating tube (21); the two ends of the heating tube (21) are respectively connected to the liquid supply device (1) and the sedimentation device (3); a light-transmitting notch (221) for sunlight to pass through is formed on the photovoltaic panel (22); the light-transmitting notch (221) is opposite to the heating tube (21) along the radial direction of the heating tube (21), so that sunlight can directly hit the heating tube (21) and can pass through the heating tube (21) to irradiate the photovoltaic panel (22); The liquid supply device (1) can deliver a mixed liquid comprising microalgae pulp and metal nanoparticles to the heating pipe (21); the sedimentation device (3) can sediment and separate the metal nanoparticles and the microalgae pulp in the mixed liquid, and the separated microalgae pulp can be passed into the anaerobic fermentation device (4) to enable the anaerobic fermentation device (4) to produce biogas.

2. The energy conversion system using microalgae according to claim 1, characterized in that: The microalgae heating device (2) further comprises an outer sleeve (23), which is coaxially sleeved on the outside of the heating tube (21), and the photovoltaic panel (22) is fixedly connected to the inner wall of the outer sleeve (23). The outer sleeve (23) is light-transmissive at least in the area opposite to the light-transmitting notch (221); the heating tube (21) is sealedly connected to the outer sleeve (23), and a vacuum is formed between the heating tube (21) and the outer sleeve (23).

3. The energy conversion system using microalgae according to claim 1, characterized in that: The microalgae heating device (2) further comprises an arc-shaped light-collecting plate (24), which is arranged outside the heating tube (21) and spaced apart from the heating tube (21), with the concave surface of the arc-shaped light-collecting plate (24) facing the light-transmitting notch (221), and the arc-shaped light-collecting plate (24) can reflect scattered sunlight into the light-transmitting notch (221).

4. The energy conversion system using microalgae according to claim 1, characterized in that: The photovoltaic panel (22) is an arc-shaped panel extending along the circumference of the heating tube (21), and the circular angle corresponding to the photovoltaic panel (22) is less than or equal to 180 degrees; The photovoltaic panels (22) are spaced apart from each other at both side edges along the circumference of the heating tube (21) to form the light-transmitting notch (221), so that the light-transmitting notch (221) extends along the axial direction of the heating tube (21).

5. The energy conversion system using microalgae according to claim 1, characterized in that: The metal nanoparticles include silver nanoparticles.

6. The energy conversion system using microalgae according to claim 1, characterized in that: The sedimentation device (3) includes a centrifugal sedimentator, which is connected to the heating pipe (21) and the anaerobic fermentation device (4). The mixed liquid can be passed into the centrifugal sedimentator, and the centrifugal sedimentator can drive the mixed liquid to move, so that the microalgae slurry and the metal nanoparticles in the mixed liquid are separated into layers, so that the mixed liquid can transport the microalgae slurry to the anaerobic fermentation device (4) through the centrifugal sedimentator.

7. The energy conversion system using microalgae according to claim 1, characterized in that: The energy conversion system using microalgae further comprises a biogas power generation device (5), wherein the biogas power generation device (5) comprises a purification device (51) and an electrochemical reaction device (52), wherein the purification device (51) is connected to the anaerobic fermentation device (4), and the purification device (51) can purify the biogas into methane; The electrochemical reaction device (52) comprises a reformer (521) in communication with the purification device (51), a reaction chamber (522) in communication with the reformer (521), and an external circuit (523); an anode (524), a cathode (525), and an electrolyte (526) are provided in the reaction chamber (522); the anode (524) and the cathode (525) are electrically connected via the electrolyte (526); the external circuit (523) is electrically connected to the anode (524) and the cathode (525), and the external circuit (523) is used to be electrically connected to an electrical appliance (6); The purification device (51) can input the methane into the reformer (521), and the methane can react in the reformer (521) to generate synthesis gas including hydrogen and carbon monoxide; The reformer (521) can input the synthesis gas into the reaction chamber (522), and the synthesis gas can undergo an oxidation reaction at the anode (524) and a reduction reaction with oxygen at the cathode (525), so that the anode (524), the cathode (525), the electrolyte (526), ​​the external circuit (523) and the electrical appliance (6) can form a closed loop for electron movement.

8. The energy conversion system using microalgae according to claim 7, characterized in that: The electrochemical reaction device (52) further includes a first heat exchanger (53), a second heat exchanger (54), a third heat exchanger (55) and a combustion chamber (56); The first heat exchanger (53) is connected between the purification device (51) and the reformer (521) to preheat the methane flowing into the reformer (521); the second heat exchanger (54) is connected between the reformer (521) and the outside air to preheat the air flowing into the reformer (521); the third heat exchanger (55) is connected between the reaction chamber (522) and the air to preheat the air flowing into the reaction chamber (522); The first heat exchanger (53), the second heat exchanger (54) and the third heat exchanger (55) are all connected to the combustion chamber (56). The combustion chamber (56) is arranged outside the reaction chamber (522) and is connected to the reaction chamber (522) for burning the unreacted synthesis gas and air in the reaction chamber (522) so that the gas generated in the combustion chamber (56) can exchange heat with the first heat exchanger (53), the second heat exchanger (54) and the third heat exchanger (55).

9. The energy conversion system using microalgae according to claim 1, characterized in that: The energy conversion system using microalgae also includes a temperature control device, which is electrically connected to the liquid supply device (1) and can detect the temperature of the mixed liquid in the heating tube (21). The temperature control device can control the liquid supply speed of the liquid supply device (1) according to the temperature of the mixed liquid in the heating tube (21).

10. The energy conversion system using microalgae according to claim 9, characterized in that: The liquid supply device (1) includes a delivery pump, and the temperature control device includes a controller and a temperature sensor. The temperature sensor is installed on the heating tube (21), and the detection end of the temperature sensor extends to the interior of the heating tube (21). The controller is electrically connected to the delivery pump and the temperature sensor. The controller can control the working power of the delivery pump according to the detection data of the temperature sensor.

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