Microalgae cultivation system of biomass combined heat and power production

Abstract

The invention relates to the technical fields of cultivation and comprehensive utilization of resources, and particularly relates to a microalgae cultivation system of biomass combined heat and powerproduction. The cultivation system comprises a livestock and poultry cultivation waste heat power station, a biogas slurry and biogas residue treatment device, a closed light-transmitting microalgae cultivation tank, a microalgae cultivation solution collection tank and a microalgae collection device. The livestock and poultry cultivation waste heat power station comprises a control device, a continuous stirred tank reactor (CSTR) fermentation tank, a methane extraction device for separating methane from biogas, a methanol synthesis device for synthesizing methanol by using the methane, a reformer of hydrogen production by using methanol water, and a fuel cell, wherein CSTR fermentation tank, the methane extraction device, the methanol synthesis device, the reformer and the fuel cell are sequentially connected. The reformer of hydrogen production by using methanol water is provided with an electric heater for providing the temperature required for a hydrogen production reaction of reforming the methanol water. According to the invention, high-efficiency conversion of heat energy and electric energy can be locally realized by utilizing the livestock and poultry cultivation wastes, and heat and power are supplied to the system itself through the utilization of the heat energy and electric energy, so that the whole system is compact in structure and low in operation cost.

Description

technical field [0001] The invention relates to the technical field of cultivation and resource comprehensive utilization, in particular to a microalgae cultivation system for combined heat and power generation of biomass. Background technique [0002] In recent years, the microalgae cultivation that can produce biodiesel and the biogas anaerobic fermentation project that can produce biogas have received strong support from the state and developed rapidly. Microalgae have a strong ability to survive and reproduce, and can absorb various inorganic nutrients and simple organic matter from wastewater. Large-scale cultivation of economic microalgae and energy microalgae using organic wastewater as a cheap medium is a research hotspot at home and abroad. The livestock and poultry breeding process produces a large amount of organic wastewater, which is mainly used to prepare biogas at present. Especially in the cold northern regions, boilers for burning biogas are required to use...

AI Technical Summary

Problems solved by technology

However, in the existing technology, there are still some problems to be solved in the process of biogas engineering and microalgae cultivation: (1) The exhaust gas after biogas combustion is rich in carbon dioxide and a certain amount of heat, which cannot be used and discharged at will, which not only causes The loss of heat also increases the greenhouse effect of the atmosphere; (2) There are two main methods of power supply for microalgae cultivation equipment and biogas engineering equipment, one is long-distance centralized power generation, but this method is difficult for inconvenient transportation. Power supply in remote areas, which greatly limits the choice of microalgae breeding and biogas engineering sites; the other is to use biogas to generate electricity, but the existing biogas power generation system uses biogas combustion for thermal energy generation, that is, first from thermal energy conversion The secondary conversion efficiency is too low; (3) The residue after biogas fermentation is mainly biogas slurry, which is rich in nutrients such as nitrogen, but this part of biogas slurry is often not obtained in time Effective utilization results in a waste of resources and also pollutes the surrounding environment of the biogas project

Therefore, the existing microalgae culture lacks comprehensive treatment, the overall operating cost is high, and it has not been industrialized

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