CN107513442A - Indirect type Methane decarbonization method of purification and system based on microalgae photosynthetic carbon fixation principle - Google Patents
Indirect type Methane decarbonization method of purification and system based on microalgae photosynthetic carbon fixation principle Download PDFInfo
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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Abstract
本发明公开了基于微藻光合固碳原理的间接式沼气脱碳提纯方法及系统，一种基于微藻光合固碳原理实现沼气脱碳提纯方法，其特征在于,按照如下步骤完成：将待处理沼气通入到装有碳酸钠盐溶液的反应罐中，反应生成碳酸氢钠盐溶液，经过化学脱碳提纯后的沼气经反应罐排出得以收集；将反应罐内与沼气发生反应后的溶液引流至微藻培养系统中，将其作为微藻培养过程所需要的碳源；并向微藻培养系统中补充微藻生长所需要的营养元素；在微藻培养系统中，微藻将碳酸氢钠盐溶液中的碳固定为自身有机物并生成碳酸钠盐溶液；当微藻培养完成后，利用微藻采收系统对微藻培养系统中的微藻进行采收；本发明可广泛应用在能源、化工、环保等领域。
The invention discloses an indirect biogas decarbonization purification method and system based on the principle of photosynthetic carbon fixation of microalgae, a method for decarbonization and purification of biogas based on the principle of photosynthetic carbon fixation of microalgae, which is characterized in that it is completed according to the following steps: The biogas is passed into the reaction tank equipped with sodium carbonate salt solution, and the reaction generates sodium bicarbonate salt solution. After chemical decarbonization and purification, the biogas is discharged through the reaction tank to be collected; the solution after the reaction with the biogas in the reaction tank is drained In the microalgae culture system, use it as the carbon source needed for the microalgae culture process; and supplement the nutrients needed for the growth of the microalgae in the microalgae culture system; in the microalgae culture system, the microalgae will add sodium bicarbonate The carbon in the salt solution is fixed as its own organic matter and generates a sodium carbonate salt solution; when the microalgae cultivation is completed, the microalgae in the microalgae cultivation system is harvested by using the microalgae harvesting system; the present invention can be widely used in energy, chemical industry, environmental protection and other fields.
Description
技术领域technical field
本发明涉及可再生能源利用领域，具体涉及基于微藻光合固碳原理进行间接式沼气脱碳提纯方法及系统。The invention relates to the field of renewable energy utilization, in particular to an indirect methane decarbonization purification method and system based on the principle of microalgae photosynthetic carbon fixation.
背景技术Background technique
沼气作为一种可再生且环境友好的生物质能源形式，是由微生物通过厌氧消化作用产生的可燃性混合气体。沼气的主要化学成分为甲烷(40％-75％)和二氧化碳(15％-60％)，以及少量的水蒸气、硫化氢、氨气、氮气及氧气等。现阶段，中国的沼气能源化利用主要以低品位热利用为主，但是随着集中式沼气工程的建设以及沼气产业规模的发展，沼气高效高值的中高端利用途径，如沼气发电、车用燃料等，正在不断扩展和壮大。然而，在进行上述能源化利用之前，为了减少沼气中二氧化碳含量以提高沼气热值及能量密度、满足天然气沃伯指数要求，需要进一步对沼气进行相应的脱碳提纯操作。经过脱碳提纯后的沼气需满足其甲烷含量≥97％，二氧化碳含量≤3％。As a renewable and environmentally friendly form of biomass energy, biogas is a combustible mixed gas produced by microorganisms through anaerobic digestion. The main chemical components of biogas are methane (40%-75%) and carbon dioxide (15%-60%), as well as a small amount of water vapor, hydrogen sulfide, ammonia, nitrogen and oxygen. At present, China's biogas energy utilization is mainly based on low-grade heat utilization, but with the construction of centralized biogas projects and the development of the scale of the biogas industry, high-efficiency and high-value biogas utilization methods, such as biogas power generation, vehicle use Fuel, etc., is constantly expanding and growing. However, before the above-mentioned energy utilization, in order to reduce the carbon dioxide content in biogas to increase the calorific value and energy density of biogas, and meet the requirements of natural gas Wobbe index, it is necessary to further decarbonize and purify the biogas accordingly. The biogas after decarbonization and purification needs to meet its methane content ≥ 97%, carbon dioxide content ≤ 3%.
工业上常用的沼气脱除二氧化碳的工艺主要为物理化学法，如高压水洗、变压吸附和膜分离等。尽管采用上述传统方法可以获得富含甲烷的天然气产品，但是这类方法进行沼气脱碳提纯时仍然存在耗能高、成本高等缺点。首先，物理化学法均对原料气有一定的压力要求，这使得原料气在压缩过程中耗费了大量的能量(约占沼气储能的3％-6％)。而且，如果脱碳提纯后的天然气采用低压管道运输，产品的减压过程又会进一步造成操作工艺的复杂化。其次，由于吸附材料在复苏过程中的部分不可逆性，使得沼气脱碳提纯过程的系统循环性差，进而导致沼气中甲烷回收率存在不稳定性。最后，采用物理化学法进行脱碳提纯的过程中还会产生不必要的副产物，而对副产物的脱除操作会额外增加技术投资和运行成本。The commonly used technologies for removing carbon dioxide from biogas in industry are mainly physical and chemical methods, such as high-pressure water washing, pressure swing adsorption and membrane separation. Although methane-rich natural gas products can be obtained by using the above-mentioned traditional methods, such methods still have disadvantages such as high energy consumption and high cost for biogas decarbonization and purification. First of all, the physical and chemical methods all have certain pressure requirements on the raw material gas, which makes the raw material gas consume a lot of energy (accounting for about 3%-6% of the biogas energy storage) in the process of compression. Moreover, if the decarbonized and purified natural gas is transported by low-pressure pipelines, the decompression process of the product will further complicate the operation process. Secondly, due to the partial irreversibility of the adsorption material in the recovery process, the system circulation of the biogas decarbonization purification process is poor, which in turn leads to the instability of the recovery rate of methane in biogas. Finally, unnecessary by-products will be produced in the process of decarbonization and purification by physical and chemical methods, and the removal of by-products will increase additional technical investment and operating costs.
近年来，鉴于采用传统物理化学法进行沼气脱碳提纯存在一定的缺陷，研究学者们提出了采用以微藻为生物质吸附单元对沼气进行直接式生物化学脱碳提纯的方法。相比于传统的物理化学法，这类方法是直接将原料气注入到微藻藻液中，微藻利用光合作用对沼气中的二氧化碳实现脱除处理。另外，利用沼气中的二氧化碳作为碳源供给得到的微藻生物质可以用来作为生物柴油、沼气等生物燃料的原料来源，或者用于生产药品、化妆品、保健品等高附加值的产品，增加了沼气脱碳提纯过程中附加经济价值的产出。但是，微藻利用光合固碳进行直接式沼气脱碳提纯的同时会产生等量的氧气，混入氧气的天然气在运输过程中存在爆炸危险，氧气的脱出也会造成运行成本的增加。其次，微藻进行光合作用存在周期性，使得沼气脱碳提纯系统无法全天候连续运行。最为重要的是，直接通入沼气很有可能会抑制微藻生长，进而导致脱碳提纯效率下降和微藻生物质产品得率下降。In recent years, in view of the shortcomings of traditional physical and chemical methods for decarbonization and purification of biogas, researchers have proposed a method of direct biochemical decarbonization and purification of biogas using microalgae as a biomass adsorption unit. Compared with the traditional physical and chemical methods, this method directly injects the raw material gas into the microalgae liquid, and the microalgae uses photosynthesis to remove the carbon dioxide in the biogas. In addition, the microalgal biomass obtained by using carbon dioxide in biogas as a carbon source can be used as a source of raw materials for biofuels such as biodiesel and biogas, or for the production of high value-added products such as pharmaceuticals, cosmetics, and health care products. The output of added economic value in the process of decarbonization and purification of biogas. However, when microalgae use photosynthetic carbon fixation for direct biogas decarbonization and purification, an equal amount of oxygen will be produced at the same time. The natural gas mixed with oxygen has the risk of explosion during transportation, and the release of oxygen will also increase the operating cost. Secondly, there is a periodicity in the photosynthesis of microalgae, which makes the biogas decarbonization and purification system unable to operate continuously around the clock. Most importantly, the direct introduction of biogas is likely to inhibit the growth of microalgae, resulting in a decrease in decarbonization purification efficiency and a decrease in the yield of microalgae biomass products.
发明内容Contents of the invention
为了解决上述现有技术的缺点，本发明的目的在于提供一种基于微藻光合固碳原理的间接式沼气脱碳提纯方法及系统，解决传统沼气脱碳提纯过程中操作复杂、投资成本高、循环性差等问题，同时解决利用微藻进行直接式沼气脱碳提纯过程中存在的微藻培养受限和脱碳提纯效率较低等问题。In order to solve the above-mentioned shortcomings of the prior art, the object of the present invention is to provide an indirect biogas decarbonization purification method and system based on the principle of microalgae photosynthetic carbon fixation, to solve the complex operation, high investment cost, At the same time, it solves the problems of limited microalgae cultivation and low decarbonization and purification efficiency in the process of using microalgae for direct biogas decarbonization and purification.
本发明的第一个技术方案是：一种基于微藻光合固碳原理实现沼气脱碳提纯方法，其特征在于,按照如下步骤完成：The first technical solution of the present invention is: a method for decarbonization and purification of biogas based on the principle of photosynthetic carbon fixation of microalgae, characterized in that it is completed according to the following steps:
步骤一，将待处理沼气通入到装有碳酸钠盐溶液的反应罐中反应生成碳酸氢钠盐溶液，经过化学脱碳提纯后的沼气经反应罐排出得以收集；Step 1, the biogas to be treated is passed into a reaction tank equipped with sodium carbonate salt solution to react to generate sodium bicarbonate salt solution, and the biogas purified by chemical decarburization is discharged through the reaction tank to be collected;
步骤二，将反应罐内与沼气发生反应后的溶液引流至微藻培养系统中，将其作为微藻培养过程所需要的碳源；并向微藻培养系统中补充微藻生长所需要的营养元素；Step 2: Drain the solution after reacting with the biogas in the reaction tank to the microalgae culture system, and use it as the carbon source required for the microalgae culture process; and supplement the nutrients needed for the growth of the microalgae into the microalgae culture system element;
步骤三，在微藻培养系统中，微藻将碳酸氢钠盐溶液中的碳固定为自身有机物并生成碳酸钠盐溶液；当微藻培养完成后，利用微藻采收系统对微藻培养系统中的微藻进行采收；采收后再将微藻采收系统中的液相溶液重新回流到反应罐中用于沼气脱碳提纯。Step 3, in the microalgae culture system, the microalgae fixes the carbon in the sodium bicarbonate salt solution as its own organic matter and generates a sodium carbonate salt solution; After harvesting, the liquid phase solution in the microalgae harvesting system is returned to the reaction tank for biogas decarbonization and purification.
本发明同时将化学法和生物法两种理念融合到沼气脱碳提纯过程中，在实现沼气脱碳提纯的同时，不仅能大幅度减少二氧化碳的排放，而且能通过微藻光合固碳作用获得微藻生物质，为生物柴油、沼气等生物燃料的生产以及药品、化学品、保健品等高附加价值产品生产提供可靠有效的有机底物；本发明规避了传统物理化学法较高的投资和运行成本以及复杂的操作工艺；解决了利用微藻进行直接式沼气脱碳提纯过程中待处理沼气对于微藻生长的不利影响，以及氧气含量过高对于沼气运输和使用过程中的潜在危险；同时解决了利用微藻进行直接式沼气脱碳提纯过程中存在的微藻培养受限和脱碳提纯效率较低等问题；本发明成本低，结构简单，操作简单；可广泛应用在能源、环保等领域。The present invention simultaneously integrates the two concepts of chemical method and biological method into the biogas decarbonization and purification process. While realizing biogas decarbonization and purification, it can not only greatly reduce the emission of carbon dioxide, but also obtain microalgae photosynthetic carbon fixation. Algae biomass provides reliable and effective organic substrates for the production of biofuels such as biodiesel and biogas, as well as the production of high value-added products such as medicines, chemicals, and health products; the invention avoids the relatively high investment and operation of traditional physical and chemical methods Cost and complex operation process; solve the adverse effect of the untreated biogas on the growth of microalgae in the process of direct biogas decarbonization purification using microalgae, and the potential danger of high oxygen content in the process of biogas transportation and use; at the same time solve The problem of limited microalgae cultivation and low decarbonization purification efficiency in the process of using microalgae for direct biogas decarbonization and purification is solved; the invention has low cost, simple structure and simple operation; it can be widely used in energy, environmental protection and other fields .
本发明的第二个技术方案是：一种基于微藻光合固碳原理实现沼气脱碳提纯系统，包括反应罐、微藻培养系统和微藻采收系统，反应罐设置有沼气进口、沼气出口、反应液进口和反应液出口；微藻培养系统设置有培养基进口、进液口和出液口；微藻采收系统设置有采收液进口和采收液出口；其特征在于：反应液出口与进液口连接，出液口与采收液进口连接，采收液出口与反应液进口连接；反应罐内存储有碳酸钠盐溶液；待处理沼气通过沼气进口通入反应罐中进行化学脱碳提纯处理，处理后的沼气通过沼气出口排出得以收集；反应罐内的碳酸钠盐溶液与沼气发生反应，生成碳酸氢钠盐溶液，碳酸氢钠盐溶液通过反应液出口和进液口引流至微藻培养系统中，以作为微藻培养过程所需要的碳源；将微藻生长所需要的营养元素通过培养基进口加入微藻培养系统内；在微藻培养系统中，微藻将碳酸氢钠盐溶液中的碳固定为自身有机物，并生成碳酸钠盐溶液；当微藻培养完成后，待采收的溶液通过出液口和采收液进口引流至微藻采收系统中，利用微藻采收系统对微藻培养系统中的微藻进行采收；采收后再将微藻采收系统中的液相溶液通过采收液出口和反应液进口重新回流到反应罐中用于沼气脱碳提纯。The second technical solution of the present invention is: a biogas decarbonization purification system based on the principle of microalgae photosynthetic carbon fixation, including a reaction tank, a microalgae cultivation system and a microalgae harvesting system, and the reaction tank is provided with a biogas inlet and a biogas outlet , a reaction liquid inlet and a reaction liquid outlet; the microalgae cultivation system is provided with a medium inlet, a liquid inlet and a liquid outlet; the microalgae harvesting system is provided with a harvesting liquid inlet and a harvesting liquid outlet; it is characterized in that: the reaction liquid The outlet is connected to the liquid inlet, the liquid outlet is connected to the inlet of the recovery fluid, and the outlet of the recovery fluid is connected to the inlet of the reaction solution; sodium carbonate salt solution is stored in the reaction tank; the biogas to be treated is passed into the reaction tank through the biogas inlet for chemical Decarbonization and purification treatment, the treated biogas is discharged through the biogas outlet to be collected; the sodium carbonate salt solution in the reaction tank reacts with the biogas to generate a sodium bicarbonate salt solution, and the sodium bicarbonate salt solution is drained through the reaction solution outlet and the liquid inlet into the microalgae culture system as the carbon source required for the microalgae culture process; the nutrients needed for the growth of the microalgae are added to the microalgae culture system through the medium inlet; in the microalgae culture system, the carbonic acid The carbon in the hydrogen sodium salt solution is fixed as its own organic matter, and a sodium carbonate salt solution is generated; when the microalgae culture is completed, the solution to be harvested is drained into the microalgae harvesting system through the liquid outlet and the harvesting fluid inlet, and used The microalgae harvesting system harvests the microalgae in the microalgae cultivation system; after harvesting, the liquid phase solution in the microalgae harvesting system flows back into the reaction tank through the harvesting liquid outlet and the reaction liquid inlet for Biogas decarbonization and purification.
本发明的技术原理是：Technical principle of the present invention is:
第一、基于化学反应基础，待处理沼气中的二氧化碳与碳酸钠盐溶液发生化学反应生成碳酸氢钠盐溶液；化学反应式为：First, based on the chemical reaction, the carbon dioxide in the biogas to be treated reacts with the sodium carbonate salt solution to form a sodium bicarbonate salt solution; the chemical reaction formula is:
第二、微藻将碳酸氢钠盐溶液经由细胞膜运输到细胞内部，位于羧酶体上的碳酸酐酶将碳酸氢钠盐溶液转化为二氧化碳，化学反应式为：Second, the microalgae transports the sodium bicarbonate solution to the inside of the cell through the cell membrane, and the carbonic anhydrase located on the carboxysome converts the sodium bicarbonate solution into carbon dioxide. The chemical reaction formula is:
二氧化碳在微藻进行卡尔文循环过程中通过二磷酸核酮糖羧化酶的作用进一步转化成葡萄糖；化学反应式为：Carbon dioxide is further converted into glucose through the action of ribulose diphosphate carboxylase during the Calvin cycle of microalgae; the chemical reaction formula is:
6CO2+6H2O→C6H12O6+6O2 6CO 2 +6H 2 O→C 6 H 12 O 6 +6O 2
第三、随着碳酸氢钠盐溶液被微藻作为碳源不断消耗后，溶液中的pH会有所增加。因此，溶液中未被转化的碳酸氢钠盐溶液会与氢氧根发生反应生成碳酸钠盐溶液，碳酸钠盐溶液的形成实现了脱碳提纯溶液的自动复苏，化学反应式为：Third, as the sodium bicarbonate solution is continuously consumed by the microalgae as a carbon source, the pH in the solution will increase. Therefore, the unconverted sodium bicarbonate salt solution in the solution will react with hydroxide to generate sodium carbonate salt solution, and the formation of sodium carbonate salt solution has realized the automatic recovery of the decarburization purification solution, and the chemical reaction formula is:
本发明所述的一种基于微藻光合固碳原理的间接式沼气脱碳提纯方法及系统的有益效果是：本发明在实现沼气脱碳提纯的同时，不仅能大幅度减少二氧化碳的排放，而且能通过微藻光合固碳作用获得微藻生物质，规避了传统物理化学法较高的投资和运行成本以及复杂的操作工艺；解决了利用微藻进行直接式沼气脱碳提纯过程中脱碳提纯效率较低、待处理沼气对于微藻生长的不利影响、以及氧气含量过高对于沼气运输和使用过程中的潜在危险等问题；本发明成本低，结构简单，操作简单、安全；可广泛应用在能源、环保等领域。The beneficial effects of the indirect biogas decarbonization purification method and system based on the principle of microalgae photosynthetic carbon fixation described in the present invention are: the present invention can not only greatly reduce the emission of carbon dioxide while realizing the decarbonization and purification of biogas, but also Microalgae biomass can be obtained through photosynthetic carbon fixation of microalgae, which avoids the high investment and operating costs and complicated operating processes of traditional physical and chemical methods; solves the problem of decarbonization and purification in the process of using microalgae for direct biogas decarbonization purification Low efficiency, adverse effects of biogas to be treated on the growth of microalgae, and potential dangers of high oxygen content to biogas transportation and use; the invention has low cost, simple structure, simple operation and safety; it can be widely used in Energy, environmental protection and other fields.
附图说明Description of drawings
图1是本发明所述的基于微藻光合固碳原理的间接式沼气脱碳提纯方法的流程示意图。Fig. 1 is a schematic flow chart of the indirect biogas decarbonization purification method based on the principle of microalgae photosynthetic carbon fixation according to the present invention.
具体实施方式detailed description
参见图1，一种基于微藻光合固碳原理的间接式沼气脱碳提纯方法，主要包括以下步骤：Referring to Figure 1, an indirect biogas decarbonization purification method based on the principle of microalgae photosynthetic carbon fixation mainly includes the following steps:
步骤一，将待处理沼气通入到装有碳酸钠盐溶液的反应罐1中，待处理沼气中的大部分二氧化碳会与反应罐1中的碳酸钠盐溶液发生化学反应生成碳酸氢钠盐溶液，另有一小部分未发生反应的二氧化碳气体或溶解于反应罐1内部的溶液中或残存于已脱碳提纯的沼气中；经过化学脱碳提纯后的沼气经反应罐1排出得以收集。Step 1, feed the biogas to be treated into the reaction tank 1 equipped with sodium carbonate salt solution, most of the carbon dioxide in the biogas to be treated will chemically react with the sodium carbonate salt solution in the reaction tank 1 to generate sodium bicarbonate salt solution , and another small part of unreacted carbon dioxide gas is either dissolved in the solution inside the reaction tank 1 or remains in the decarburized and purified biogas; the biogas after chemical decarburization and purification is discharged through the reaction tank 1 to be collected.
步骤二，反应罐1内与沼气发生反应后的溶液主要是由已经生成的碳酸氢钠盐溶液、未反应的碳酸钠盐溶液以及未反应的二氧化碳溶解液组成；将反应罐内与沼气发生反应后的溶液引流至微藻培养系统2中，并作为微藻培养过程中所需要添加的碳源；微藻培养系统2可以采用跑道池或光生物反应器等其他有效的微藻培养系统。并向微藻培养系统2中补充微藻所需的其他营养元素即培养基：如氮肥、磷肥等以及微量元素。Step 2, the solution reacted with the biogas in the reaction tank 1 is mainly composed of the generated sodium bicarbonate salt solution, unreacted sodium carbonate salt solution and unreacted carbon dioxide solution; react the reaction tank with the biogas The final solution is drained into the microalgae cultivation system 2 and used as a carbon source that needs to be added during the microalgae cultivation process; the microalgae cultivation system 2 can use other effective microalgae cultivation systems such as raceway ponds or photobioreactors. And supplement the microalgae culture system 2 with other nutrients needed by the microalgae, namely the culture medium: such as nitrogen fertilizer, phosphorus fertilizer, etc., and trace elements.
步骤三，在微藻培养系统中，微藻在卡尔文循环过程中将反应罐1流出的碳酸氢钠盐溶液以及二氧化碳溶解液转化为自身生长过程需要的有机物；并生成碳酸钠盐溶液；当微藻培养完成后，利用微藻采收系统3对微藻培养系统2中的微藻进行采收；采收后再将微藻采收系统3中的液相溶液回流到反应罐1中用于沼气脱碳提纯。微藻采收系统3中的液相溶液的主要成分为碳酸钠盐溶液，还含有少量的碳酸氢钠盐溶液。微藻采收系统3可以采用沉降装置、离心装置或其他有效的微藻采收系统。Step 3, in the microalgae culture system, the microalgae converts the sodium bicarbonate salt solution and the carbon dioxide solution flowing out of the reaction tank 1 into the organic matter needed for its own growth process during the Calvin cycle process; and generates the sodium carbonate salt solution; when After the microalgae culture is completed, use the microalgae harvesting system 3 to harvest the microalgae in the microalgae cultivation system 2; after harvesting, return the liquid phase solution in the microalgae harvesting system 3 to the reaction tank 1 for use Used in biogas decarbonization and purification. The main component of the liquid phase solution in the microalgae harvesting system 3 is sodium carbonate salt solution, and also contains a small amount of sodium bicarbonate salt solution. The microalgae harvesting system 3 can adopt a settling device, a centrifugal device or other effective microalgae harvesting systems.
步骤四，在连续运行期，实时监测待处理沼气和已脱碳提纯沼气中二氧化碳的浓度高低，合理调整厌氧有机负荷、待处理沼气流入反应罐1的流量、反应罐1的溶液流入微藻培养系统2的流量及微藻采收后的液相溶液回流反应罐1的流量。Step 4: During the continuous operation period, monitor the concentration of carbon dioxide in the biogas to be treated and the biogas that has been decarbonized and purified in real time, and reasonably adjust the anaerobic organic load, the flow rate of the biogas to be treated into the reaction tank 1, and the solution of the reaction tank 1 into the microalgae The flow rate of the culture system 2 and the flow rate of the liquid phase solution backflow reaction tank 1 after the microalgae is harvested.
一种基于微藻光合固碳原理实现沼气脱碳提纯系统，包括反应罐1、微藻培养系统2和微藻采收系统3，反应罐1设置有沼气进口、沼气出口、反应液进口和反应液出口；微藻培养系统2设置有培养基进口、进液口和出液口；微藻采收系统3设置有采收液进口和采收液出口；反应液出口与进液口连接，出液口与采收液进口连接，采收液出口与反应液进口连接；反应罐1内存储有碳酸钠盐溶液；待处理沼气通过沼气进口通入反应罐1中进行化学脱碳提纯处理，处理后的沼气通过沼气出口排出得以收集；反应罐1内的碳酸钠盐溶液与沼气发生反应，生成碳酸氢钠盐溶液，碳酸氢钠盐溶液通过反应液出口和进液口引流至微藻培养系统2中，以作为微藻培养过程所需要的碳源；将微藻生长所需要的营养元素通过培养基进口加入微藻培养系统2内；在微藻培养系统2中，微藻将碳酸氢钠盐溶液中的碳固定为自身有机物，并生成碳酸钠盐溶液；当微藻培养完成后，待采收的溶液通过出液口和采收液进口引流至微藻采收系统3中，利用微藻采收系统3对微藻培养系统2中的微藻进行采收；采收后再将微藻采收系统3中的液相溶液通过采收液出口和反应液进口重新回流到反应罐1中用于沼气脱碳提纯。A biogas decarbonization purification system based on the principle of microalgae photosynthetic carbon fixation, including a reaction tank 1, a microalgae cultivation system 2, and a microalgae harvesting system 3. The reaction tank 1 is equipped with a biogas inlet, a biogas outlet, a reaction liquid inlet and a reaction tank. liquid outlet; the microalgae cultivation system 2 is provided with a culture medium inlet, a liquid inlet and a liquid outlet; the microalgae harvesting system 3 is provided with a harvesting liquid inlet and a harvesting liquid outlet; The liquid port is connected to the inlet of the recovery fluid, and the outlet of the recovery fluid is connected to the inlet of the reaction solution; sodium carbonate salt solution is stored in the reaction tank 1; the biogas to be treated is passed into the reaction tank 1 through the biogas inlet for chemical decarbonization purification treatment, and the treatment The final biogas is discharged through the biogas outlet to be collected; the sodium carbonate salt solution in the reaction tank 1 reacts with the biogas to generate a sodium bicarbonate salt solution, and the sodium bicarbonate salt solution is drained to the microalgae cultivation system through the reaction liquid outlet and the liquid inlet In 2, as the carbon source required for the microalgae culture process; the nutrient elements required for the growth of the microalgae are added to the microalgae culture system 2 through the medium inlet; in the microalgae culture system 2, the microalgae will The carbon in the salt solution is fixed as its own organic matter, and a sodium carbonate salt solution is generated; when the microalgae culture is completed, the solution to be harvested is drained into the microalgae harvesting system 3 through the liquid outlet and the harvesting liquid inlet, and the microalgae is used to The algae harvesting system 3 harvests the microalgae in the microalgae cultivation system 2; after harvesting, the liquid phase solution in the microalgae harvesting system 3 is returned to the reaction tank 1 through the harvesting liquid outlet and the reaction liquid inlet Used in biogas decarbonization and purification.
在具体实施例中，微藻培养系统2可以为跑道池、光生物反应器或其他有效的微藻培养系统。微藻采收系统3可以为沉降装置、离心装置或采用其他有效采收系统进行替换，但该采收系统不能影响采收后的液相溶液的主要理化性质。In a specific embodiment, the microalgae cultivation system 2 can be a raceway pond, a photobioreactor or other effective microalgae cultivation systems. The microalgae harvesting system 3 can be replaced by a settling device, a centrifugal device or other effective harvesting systems, but the harvesting system cannot affect the main physical and chemical properties of the harvested liquid phase solution.
尽管已经示出和描述了本发明的实施例，本领域的普通技术人员可以理解：在不脱离本发明的原理和宗旨的情况下可以对这些实施例进行多种变化、修改、替换和变型，本发明的范围由权利要求及其等同物限定。Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the invention is defined by the claims and their equivalents.
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Application publication date: 20171226 |