Method for cooperatively treating flue gas of steel hot-blast stove by using double algae species and application of method

Abstract

The invention relates to a method for cooperatively treating flue gas of a steel hot-blast stove by using double algae species and application of the method. The method comprises the following steps: inoculating microalgae into a reactor, filling the flue gas of the steel hot-blast stove for carbon sequestration culture, and then collecting the microalgae; the microalgae comprise chlorella and scenedesmus obliquus. According to the method, the CO2 in the flue gas of the steel hot-blast stove is fixed by utilizing the artificially cultured algae species, so that the tolerance of the flue gas is improved, and the fixation rate of the CO2 is increased.

Description

A method for synergistic treatment of flue gas from steel hot blast stoves using two algal species and its application. Technical Field

[0001] This invention relates to the field of microalgae biotechnology, and in particular to a method for treating flue gas from a steel hot blast stove using two algae species in synergistic treatment, and its application. Background Technology

[0002] With the development of human civilization, the world's demand for fossil energy (such as coal, oil, and natural gas) has been increasing, leading to a corresponding increase in CO2 emissions. CO2 is a major contributor to the greenhouse effect, accounting for approximately 70%. Since the Industrial Revolution, the concentration of CO2 in the atmosphere has risen from about 280 ppm to the current 427 ppm. Among these, eight major industries (aviation, shipping, road transport, steel, cement, aluminum, chemicals, and oil and gas) account for approximately 40% of global greenhouse gas emissions, with the steel industry accounting for 7% to 9% of global CO2 emissions. The CO2 content in the flue gas from hot blast stoves in steel mills is the largest emission process in the steel industry, accounting for 29%-52% of total emissions, with concentrations reaching as high as 30%.

[0003] Microalgae generally refer to small, photosynthetic aquatic organisms that exist in single-celled or colonial forms. Microalgae are not only diverse, widely distributed, and rapidly reproducing, but also possess high photosynthetic efficiency and yield per unit area. Therefore, microalgae have high development and utilization value. Carbon is the main element constituting microalgal cells, and carbon source costs account for a significant proportion in the cultivation process. Industrial waste gas is a major source of CO2 in the atmosphere. Using CO2 from flue gas as a carbon source for microalgae cultivation not only reduces raw material costs but also fixes CO2, realizing the environmental benefits of microalgae. Microalgae can also directly utilize SO2 and NOx from flue gas, but it is difficult for a single algal species to simultaneously achieve both good flue gas tolerance and high carbon fixation efficiency.

[0004] Therefore, by organically combining two different algal species with high tolerance to CO2, SO2, and NOx and high carbon fixation efficiency, and targeting the emission characteristics of hot blast stoves in steel plants, a dual-algal synergistic carbon reduction and pollution reduction system was constructed to enhance the adaptability of microalgae to hot blast stove flue gas in steel plants, increase carbon fixation rate, and improve microalgal biomass. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a method and its application for synergistic treatment of flue gas from steel hot blast stoves using two algae species. The method utilizes artificially cultivated algae species to fix CO2 in the flue gas from steel hot blast stoves, thereby improving the flue gas's tolerance and simultaneously increasing the CO2 fixation rate.

[0006] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, the present invention provides a method for synergistic treatment of flue gas from a steel hot blast stove using two algae species, the method comprising inoculating microalgae into a reactor, filling it with flue gas from a steel hot blast stove for carbon fixation cultivation, and then collecting the microalgae; the microalgae include Chlorella vulgaris and Scenedesmus obliquus.

[0007] This invention utilizes the synergistic effect of two algal species to treat CO2 in the flue gas of a steel hot blast stove. On the one hand, microalgae are used for biological carbon fixation of the flue gas; on the other hand, the synergistic effect of the two algal species enhances the flue gas's tolerance. Experiments have shown that this method can significantly improve the synthesis of biomass and carbohydrates in algal cells. This means it not only achieves carbon emission reduction in the flue gas from steel hot blast stoves but also enables biomass energy production, which is beneficial for bioenergy production.

[0008] In this invention, microalgae remove NOx from flue gas through two pathways: NO and NO2 directly enter the cells via diffusion, and NO and NO2 dissolve in the microalgal suspension to form nitrate and nitrite ions, which are then absorbed and utilized by the microalgae. Ultimately, they are assimilated into nitrogen-containing macromolecules such as amino acids, nucleotides, and chlorophyll, forming the organic framework of the cells.

[0009] When SO2 in flue gas dissolves in water, it is converted into sulfite or sulfate. Microalgae absorb SO2 from flue gas mainly by transporting sulfate ions from the solution into the cell through a transport system on the cell membrane. In the chloroplasts, the sulfate ions are reduced to 5'-adenosine monophosphate (APS), sulfite, and sulfides, which then directly bind to amino acids (such as cysteine).

[0010] This invention discovers that in treating flue gas from steel hot blast stoves, the combination of Chlorella vulgaris and Scenedesmus obliquus can mutually promote the absorption of waste gas, and compared with other algae, this combination has a significant synergistic effect.

[0011] Preferably, the flue gas from the steel hot blast stove comprises 25%-30% CO2 and 80-120 mg / Nm³. 3 SO2 and 180-220 mg / Nm 3 Nox. The 25%-30% can be, for example, 25%, 26%, 27%, 28%, 29%, or 30%, etc. The 80-120 mg / Nm³ 3 For example, it could be 80 mg / Nm 3 90 mg / Nm 3 100 mg / Nm 3 110 mg / Nm 3 Or 120 mg / Nm 3 etc. The 180-220 mg / Nm 3 For example, it could be 180 mg / Nm 3190 mg / Nm 3 200 mg / Nm 3 210 mg / Nm 3 Or 220 mg / Nm 3 wait.

[0012] Preferably, the NOx includes NO and NO2.

[0013] Preferably, the charge rate of the flue gas from the steel hot blast stove is 100-200 mL / min. This 100-200 mL / min can be, for example, 100 mL / min, 110 mL / min, 120 mL / min, 130 mL / min, 140 mL / min, 150 mL / min, 160 mL / min, 170 mL / min, 180 mL / min, 190 mL / min, or 200 mL / min, etc.

[0014] Preferably, the inoculum amount of microalgae is 0.01-0.05 g / L. The 0.01-0.05 g / L can be, for example, 0.01 g / L, 0.02 g / L, 0.03 g / L, 0.04 g / L, or 0.05 g / L.

[0015] Preferably, the mass ratio of Chlorella vulgaris to Scenedesmus obliquus is (1-3):1. The (1-3) can be, for example, 1, 1.5, 2, 2.5, or 3.

[0016] Preferably, the culture medium for inoculating the microalgae comprises 1-3 g / L NaNO3, 30-50 mg / L K2HPO4·3H2O, 70-80 mg / L MgSO4·7H2O, 30-40 mg / L CaCl2·2H2O, 8-15 mg / L FeSO4·7H2O, 0.5-3 mg / L EDTA, 15-25 mg / L Na3PO4, 2-3 mg / L H3BO3, 0.5-3 mg / L MnCl2·4H2O, 0.1-0.5 mg / L ZnSO4·7H2O, 0.01-0.1 mg / L CuSO4·5H2O, 0.1-0.5 mg / L NaMoO4·2H2O, and 0.01-0.1 mg / L Co(NO3)2·6H2O. The 1-3 g / L can be, for example, 1 g / L, 1.5 g / L, 2 g / L, 2.5 g / L, or 3 g / L. The 30-50 mg / L can be, for example, 30 mg / L, 35 mg / L, 40 mg / L, 45 mg / L, or 50 mg / L. The 70-80 mg / L can be, for example, 70 mg / L, 72 mg / L, 74 mg / L, 76 mg / L, 78 mg / L, or 80 mg / L. The 30-40 mg / L can be, for example, 30 mg / L, 32 mg / L, 34 mg / L, 36 mg / L, 38 mg / L, or 40 mg / L. The 8-15 mg / L can be, for example, 8 mg / L, 9 mg / L, 10 mg / L, 11 mg / L, 12 mg / L, 13 mg / L, 14 mg / L, or 15 mg / L. The 0.5-3 mg / L can be, for example, 0.5 mg / L, 1 mg / L, 1.5 mg / L, 2 mg / L, 2.5 mg / L, or 3 mg / L. The 15-25 mg / L can be, for example, 15 mg / L, 16 mg / L, 17 mg / L, 18 mg / L, 19 mg / L, 20 mg / L, 21 mg / L, 22 mg / L, 23 mg / L, 24 mg / L, or 25 mg / L. The 2-3 mg / L can be, for example, 2 mg / L, 2.2 mg / L, 2.4 mg / L, 2.6 mg / L, 2.8 mg / L, or 3 mg / L. The 0.1-0.5 mg / L can be, for example, 0.1 mg / L, 0.2 mg / L, 0.3 mg / L, 0.4 mg / L, or 0.5 mg / L. The 0.01-0.1 mg / L can be, for example, 0.01 mg / L, 0.02 mg / L, 0.04 mg / L, 0.06 mg / L, 0.08 mg / L, or 0.1 mg / L, etc.

[0017] The present invention uses a modified BG11 medium, which is a standard BG11 medium with the carbon source removed. In this method, the carbon source comes entirely from the flue gas, which can be converted into biomass energy and carbohydrates, thereby realizing waste utilization. Bioenergy can then be produced on this basis.

[0018] Preferably, the reactor comprises a tubular photogenerating reactor.

[0019] Preferably, the carrier gas for the carbon fixation culture is nitrogen.

[0020] Preferably, the gaseous environment for the carbon fixation culture includes 25%-30% CO2 and 80-120 mg / Nm³. 3 SO2, 180-220 mg / Nm3 NOx and N2. The 25%-30% concentration can be, for example, 25%, 26%, 27%, 28%, 29%, or 30%, etc. The 80-120 mg / Nm3 concentration... 3 For example, it could be 80 mg / Nm 3 90 mg / Nm 3 100 mg / Nm 3 110 mg / Nm 3 Or 120 mg / Nm 3 etc. The 180-220 mg / Nm 3 For example, it could be 180 mg / Nm 3 190 mg / Nm 3 200 mg / Nm 3 210 mg / Nm 3 Or 220mg / Nm 3 wait.

[0021] In this invention, flue gas from a steel hot blast stove is introduced into a nitrogen atmosphere to reduce the influence of other carbon sources in the air.

[0022] Preferably, the light intensity for carbon fixation culture is 10,000-15,000 Lux. The 10,000-15,000 Lux can be, for example, 10,000 Lux, 11,000 Lux, 12,000 Lux, 13,000 Lux, 14,000 Lux, or 15,000 Lux.

[0023] Preferably, the light exposure time and dark time for the carbon fixation culture are 10-14 h and 10-14 h respectively. The 10-14 h can be, for example, 10 h, 11 h, 12 h, 13 h or 14 h.

[0024] In this invention, flue gas components are introduced into a culture medium inoculated with two algal species, and the algae are cultured and acclimatized under light conditions until the algal cells are tolerant to the flue gas components and the algal cell concentration no longer increases, thus entering a stable growth period.

[0025] Preferably, the light source for the illumination includes an LED light source.

[0026] Preferably, the culture temperature is 25℃-30℃, and the time is 10-15 days. The 10-15 days can be, for example, 10, 11, 12, 13, 14, or 15 days. The 25℃-30℃ can be, for example, 25℃, 26℃, 27℃, 28℃, 29℃, or 30℃.

[0027] Preferably, the method for collecting microalgae includes centrifugal collection.

[0028] Preferably, the centrifugation collection is performed at a speed of 8000-12000 rpm for 10-20 minutes. The 8000-12000 rpm can be, for example, 8000 rpm, 9000 rpm, 10000 rpm, 11000 rpm, or 12000 rpm. The 10-20 minutes can be, for example, 10 minutes, 12 minutes, 14 minutes, 16 minutes, 18 minutes, or 20 minutes.

[0029] In a second aspect, the present invention provides an application of the method for synergistic treatment of hot blast stove flue gas of steelmaking using two algae species as described in the first aspect in the treatment of hot blast stove flue gas of steelmaking.

[0030] Compared with the prior art, the present invention has at least the following beneficial effects: The present invention uses high concentrations of CO2, NOx, and SO2 in the flue gas of steel hot blast stoves for dual algae cultivation, thereby achieving carbon emission reduction of hot blast stove flue gas, improving the tolerance to CO2, NOx, and SO2 and CO2 utilization rate, and at the same time improving the productivity of microalgae biomass. Detailed Implementation

[0031] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0032] The reagents used in the following examples were sourced from Shanghai Guangyu Biotechnology Co., Ltd.: Chlorella and Scenedesmus obliquus.

[0033] Example 1: In this example, the flue gas from a hot blast stove in steel was treated with a dual-algal synergistic method. Chlorella vulgaris and Scenedesmus obliquus were inoculated into the culture medium at inoculation rates of 0.02 g / L and 0.01 g / L, respectively. The culture medium consisted of 1.5 g / L NaNO3, 40 mg / L K2HPO4·3H2O, 75 mg / L MgSO4·7H2O, 36 mg / L CaCl2·2H2O, 12 mg / L FeSO4·7H2O, 1 mg / L EDTA, 20 mg / L Na3PO4, 2.86 mg / L H3BO3, 1.81 mg / L MnCl2·4H2O, 0.222 mg / L ZnSO4·7H2O, 0.079 mg / L CuSO4·5H2O, 0.39 mg / L NaMoO4·2H2O, and 0.0494 mg / L Co(NO3)2·6H2O. Simultaneously, flue gas was introduced into a 300 mL tubular photogenerator at a rate of 100 mL / min for carbon fixation cultivation. The flue gas composition was 28% CO2 and 190 mg / Nm³ NOx. 3 SO2 95 mg / Nm 3 The NOx concentration was 90% NO. Nitrogen was used as the carrier gas. The LED light intensity was 15000 Lux, the light-dark ratio was 12 h:12 h, and the temperature was 25℃. After 14 days of cultivation, algal cells were obtained by reserving 0.04 g / L of algal cells and centrifuging the remainder at 10000 rpm for 15 min.

[0034] Example 2: In this example, the flue gas from a hot blast stove in steel was treated with a dual-algal synergistic method. Chlorella vulgaris and Scenedesmus obliquus were inoculated into the culture medium at inoculation rates of 0.025 g / L and 0.025 g / L, respectively. The culture medium consisted of 1.5 g / L NaNO3, 40 mg / L K2HPO4·3H2O, 75 mg / L MgSO4·7H2O, 36 mg / L CaCl2·2H2O, 12 mg / L FeSO4·7H2O, 1 mg / L EDTA, 20 mg / L Na3PO4, 2.86 mg / L H3BO3, 1.81 mg / L MnCl2·4H2O, 0.222 mg / L ZnSO4·7H2O, 0.079 mg / L CuSO4·5H2O, 0.39 mg / L NaMoO4·2H2O, and 0.0494 mg / L Co(NO3)2·6H2O. Simultaneously, flue gas was introduced into a 300 mL tubular photogenerator reactor at a rate of 200 mL / min for carbon fixation cultivation. The flue gas composition was 25% CO2 and 200 mg / Nm³ NOx. 3 SO2 80 mg / Nm 3The NOx concentration was 90% NO. The carrier gas was nitrogen, the LED light intensity was 10000 Lux, the light-dark ratio was 10 h:14 h, the temperature was 27℃, and after 10 days of cultivation, algal cells were obtained by reserving 0.04 g / L of algal cells and centrifuging the rest at 10000 rpm for 10 min.

[0035] Example 3: This example demonstrates the synergistic treatment of flue gas from a steel hot blast stove using two algal species. Chlorella vulgaris and Scenedesmus obliquus were inoculated into the culture medium at concentrations of 0.0075 g / L and 0.0025 g / L, respectively. The culture medium composition was: 1.5 g / L NaNO3, 40 mg / L K2HPO4·3H2O, 75 mg / L MgSO4·7H2O, 36 mg / L CaCl2·2H2O, 12 mg / L FeSO4·7H2O, 1 mg / L EDTA, 20 mg / L Na3PO4, 2.86 mg / L H3BO3, 1.81 mg / L MnCl2·4H2O, 0.222 mg / L ZnSO4·7H2O, 0.079 mg / L CuSO4·5H2O, 0.39 mg / L NaMoO4·2H2O, and 0.0494 mg / L NaMoO4·2H2O. Co(NO3)2·6H2O. Simultaneously, flue gas was introduced into a 300 mL tubular photogenerator reactor at a rate of 150 mL / min for carbon fixation cultivation. The flue gas composition was 30% CO2 and 180 mg / Nm³ NOx. 3 SO2 120 mg / Nm 3 The NOx concentration was 90% NO. Nitrogen was used as the carrier gas. The LED light intensity was 12000 Lux, the light-dark ratio was 14 h:10 h, and the temperature was 30℃. After 20 days of cultivation, algal cells were obtained by reserving 0.04 g / L of algal cells and centrifuging the remainder at 8000 rpm for 20 min.

[0036] Example 4: This example demonstrates the synergistic treatment of flue gas from a steel hot blast stove using two algae species. The only difference from Example 1 is that the inoculation amounts of Chlorella vulgaris and Scenedesmus obliquus are 0.01 g / L and 0.02 g / L, respectively. All other aspects are the same as in Example 1.

[0037] Example 5: This example demonstrates the synergistic treatment of flue gas from a steel hot blast stove using two algae species. The only difference from Example 1 is that the inoculum amounts of Chlorella vulgaris and Scenedesmus obliquus are 0.025 g / L and 0.005 g / L, respectively. All other aspects are the same as in Example 1.

[0038] Example 6: This example demonstrates the synergistic treatment of flue gas from a steel hot blast stove using two algae species. The only difference from Example 1 is that the inoculation amounts of Chlorella vulgaris and Scenedesmus obliquus are 0.12 g / L and 0.06 g / L, respectively. All other aspects are the same as in Example 1.

[0039] Example 7 This example demonstrates the synergistic treatment of flue gas from a steel hot blast stove using two algae species. The only difference from Example 1 is that the inoculation amounts of Chlorella vulgaris and Scenedesmus obliquus are 0.004 g / L and 0.002 g / L, respectively. All other aspects are the same as in Example 1.

[0040] Example 8: This example demonstrates the synergistic treatment of flue gas from a steel hot blast stove using two algae species. The only difference from Example 1 is that the flue gas influx rate is 50 mL / min, while the rest is the same as Example 1.

[0041] Example 9: This example demonstrates the synergistic treatment of flue gas from a steel hot blast stove using two algae species. The only difference from Example 1 is that the flue gas influx rate is 250 mL / min, while the rest is the same as Example 1.

[0042] Example 10: This example demonstrates the synergistic treatment of hot blast stove flue gas from steel production using two algae species. The only difference from Example 1 is that the flue gas composition is 20% CO2 and 250 mg / Nm³ NOx. 3 SO2 60 mg / Nm 3 In this example, NO accounts for 90% of NOx. The rest is the same as in Example 1.

[0043] Example 11: This example demonstrates the synergistic treatment of hot blast stove flue gas from steel production using two algae species. The only difference from Example 1 is that the flue gas composition is 35% CO2 and 150 mg / Nm³ NOx. 3 SO2 150 mg / Nm 3 In this example, NO accounts for 90% of NOx. The rest is the same as in Example 1.

[0044] Comparative Example 1: This comparative example demonstrates the synergistic treatment of hot blast stove flue gas from steel plants using two algae species. The only difference from Example 1 is that Chlorella is not added, and the inoculum amount of Chlorella is allocated to Scenedesmus obliquus. All other aspects are the same as in Example 1.

[0045] Comparative Example 2: This comparative example demonstrates the synergistic treatment of hot blast stove flue gas from steel plants using two algae species. The only difference from Example 1 is that Scenedesmus obliquus is not added, and the inoculum amount of Scenedesmus obliquus is allocated to Chlorella vulgaris. All other aspects are the same as in Example 1.

[0046] Comparative Example 3 involved the synergistic treatment of flue gas from a steel hot blast stove by two algae species. The only difference from Example 1 was that Microcystis aeruginosa was used instead of Chlorella vulgaris; otherwise, they were identical to Example 1.

[0047] Comparative Example 4 involved the synergistic treatment of flue gas from a steel hot blast stove by two algae species. The only difference from Example 1 was that Spirulina was used instead of Scenedesmus obliquus; otherwise, they were identical to Example 1.

[0048] Test Example 1: This test example was used to test the carbon fixation effect of the above algal cells. The results are shown in Table 1. The carbon fixation rate of microalgal biomass was calculated based on the density and carbon content of the microalgae: CO2 carbon fixation rate = (algal cell density after culture × algal cell carbon content - inoculated algal cell density × algal cell carbon content) / culture days × (molar mass of CO2 / molar mass of carbon).

[0049] The biomass concentration can be calculated by weighing the algal cells after centrifugation. Biomass concentration = weight in grams / total volume of liquid before centrifugation. The carbohydrate content in microalgae is determined using the phenol-sulfuric acid colorimetric method, and the protein content is determined using the Kjeldahl method.

[0050] Table 1 The results above show that: (1) Through the comparison of Examples 1-3, it can be seen that the method of the present invention has a high accumulation of carbon fixation rate, biomass concentration, carbohydrate and protein content within an effective range.

[0051] (2) The comparison between Example 1 and Examples 4-7 shows that the algae ratio and the amount of algae inoculated directly affect the growth of microalgae. Too few algal cells cannot reach the density to absorb CO2 in flue gas within the effective time; too many algal cells, due to their high density, are prone to cluster growth, affecting growth and carbon fixation efficiency.

[0052] (3) The comparison between Example 1 and Examples 8-11 shows that during the microalgae cultivation process, both excessive and insufficient flue gas flow affect the solubility of the flue gas in the solution, thus affecting the amount of carbon in the solution and consequently the growth of algal cells and carbon fixation efficiency. The amount of NOx and SO2 in the flue gas directly affects the pH of the solution, thereby affecting the growth of algal cells.

[0053] (4) By comparing Example 1 with Comparative Examples 1-4, it can be seen that the replacement of algae strains affected the synergistic effect in flue gas.

[0054] In summary, this invention utilizes artificially cultivated algae to fix CO2 in the flue gas of a steel hot blast stove, thereby improving the flue gas's tolerance and simultaneously increasing the CO2 fixation rate.

[0055] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A method for synergistic treatment of flue gas from a steel hot blast stove using two algal species, characterized in that, The method includes inoculating microalgae into a reactor, filling it with flue gas from a steel hot blast stove for carbon fixation cultivation, and then collecting the microalgae; the microalgae include Chlorella vulgaris and Scenedesmus obliquus.

2. The method for synergistic treatment of hot blast stove flue gas using two algae species according to claim 1, characterized in that, The flue gas from the steel hot blast stove contains 25%-30% CO2 and 80-120 mg / Nm³. 3 SO2 and 180-220 mg / Nm3NOx; preferably, the NOx includes NO and NO2.

3. The method for synergistic treatment of hot blast stove flue gas using two algae species according to claim 1 or 2, characterized in that, The charge rate of the flue gas from the steel hot blast stove is 100-200 mL / min.

4. The method for synergistic treatment of hot blast stove flue gas using two algae species according to any one of claims 1-3, characterized in that, The inoculation amount of the microalgae is 0.01-0.05 g / L; preferably, the mass ratio of Chlorella vulgaris to Scenedesmus obliquus is (1-3):

1.

5. The method for synergistic treatment of hot blast stove flue gas using two algae species according to any one of claims 1-4, characterized in that, The culture medium for inoculating the microalgae includes 1-3 g / L NaNO3, 30-50 mg / L K2HPO4·3H2O, 70-80 mg / L MgSO4·7H2O, 30-40 mg / L CaCl2·2H2O, 8-15 mg / L FeSO4·7H2O, 0.5-3 mg / L EDTA, 15-25 mg / L Na3PO4, 2-3 mg / L H3BO3, 0.5-3 mg / L MnCl2·4H2O, 0.1-0.5 mg / L ZnSO4·7H2O, 0.01-0.1 mg / L CuSO4·5H2O, 0.1-0.5 mg / L NaMoO4·2H2O, and 0.01-0.1 mg / L Co(NO3)2·6H2O.

6. The method for synergistic treatment of hot blast stove flue gas using two algae species according to any one of claims 1-5, characterized in that, The reactor includes a tubular photogenerating reactor.

7. The method for synergistic treatment of hot blast stove flue gas using two algae species according to any one of claims 1-6, characterized in that, The carrier gas for the carbon fixation culture is nitrogen.

8. The method for synergistic treatment of hot blast stove flue gas using two algae species according to any one of claims 1-7, characterized in that, The light intensity for carbon fixation culture is 10,000-15,000 Lux; preferably, the light duration for carbon fixation culture is 10-14 h and the dark duration is 10-14 h; preferably, the light source includes an LED light source; preferably, the culture temperature is 25℃-30℃ and the culture time is 10-15 days.

9. The method for synergistic treatment of hot blast stove flue gas using two algae species according to any one of claims 1-8, characterized in that, The method for collecting microalgae includes centrifugal collection; preferably, the centrifugation speed is 8000-12000 rpm and the time is 10-20 min.

10. The application of a method for synergistic treatment of hot blast stove flue gas of steel using two algae species according to any one of claims 1-9 in the treatment of hot blast stove flue gas of steel.

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