| Bio-hydrogen production has rich raw materials,production process clean,energy-saving,no consumption of fossil resources,etc.It implements waste utilization,reduce environmental pollution,but also provides clean hydrogen energy,ease the energy crisis,so it has broad prospects for development.At present,the rapid development of biological hydrogen production technology,but the high cost,energy conversion rate is one of the important factors restricting its development,can’t meet the requirements of low cost hydrogen production.Research and development of efficient bio-hydrogen reactor with continuous production capacity can not only reduce the production cost,improve the conversion efficiency,but also the basic conditions to realize industrial production,is the key to transformation of bio-hydrogen production technology from the laboratory to industrial production.This paper is financially supported by the National High-tech R&D Program(863 Program)“key technology research and demonstration of Biological hydrogen production ”.In view of the high cost of bio-hydrogen production and dark fermentation inhibiting photosynthetic fermentation bio-hydrogen production problems,based on the new biomass photosynthesis-anaerobic biological hydrogen production’s technology research,this paper set up the photosynthetic-anaerobic biological hydrogen production demonstration installation through the design of biomass photosynthesis-anaerobic biological hydrogen production reactor,the design of solar photovoltaic and thermal conversion unit,design of novel bacteria-cultivating device for photo-fermentative bio-hydrogen production etc.This system can significantly reduce the traditional fossil energy consumption of the fermentation process,the elimination of dark fermentation inhibiting photosynthetic fermentation bio-hydrogen production problems,enhance the efficiency of bio-hydrogen production and reduce the cost of hydrogen production,hydrogen production technology for the realization of biological studies from theory to practical application transformation and industrial application of biological hydrogen production technology to provide a technical reference.Research results are as follows:(1)According to the design principles and technical means,to determine the basic parameters of the biomass photosynthesis-anaerobic biological hydrogen production reactor with ABR type structure.In accordance with the previously established design scale and process parameters,calculate and design the basic structure size of the reactor.The total volume of dark fermentation hydrogen production unit is 3.366m~3 and the effective volume is 3.023m~3.The total volume of photo fermentation hydrogen production unit is 10.56m~3 and the effective volume is 7.8113m~3.The total volume of the biomass photosynthesis-anaerobic biological hydrogen production reactor reached 15m~3.(2)In considering the status of the distribution of solar energy resources in China and the illumination requirements of photosynthetic fermentation bio-hydrogen production,determine the basic design of the sun light as light source,the device with sunlight as the main light source and LED for auxiliary light has been designed.Optimal design of the automatic tracking solar concentrator and fiber optic transmission systems,design and installation of 24 solar concentrator that can output a total of 96 beams of light,lighting an area of 2.78m~2,the system can meet the lighting needs of the fermentation process.System chooses yellow low energy consumption LED as auxiliary light source and there is a total of 117 LED light pipe layout.System daily electricity demand of about 2053W·h.The battery capacity of the solar cell panel is 579.9Wp,which is composed of 8 panels.Also select six voltage of 12 V,200A · h capacity batteries in parallel.(3)Based on the analysis of the basic needs of the system temperature on the energy balance of the system analysis and calculation,the system needs calories per day is 964.32 10 k J/d.Based system needs heat,the design selection around 660 solar vacuum tube 1800′58 and the total collector area is about 100.32m~2.The design capacity of the heat storage water tank is 2000 L,while using voltage 220 V,single-phase power 5kw model DFS-H5 type as auxiliary electric heating system.(4)According to the requirements of the photosynthetic bacteria HAU-M1 cultivation and the actual needs of systems operation,a set of bacteria-cultivating device for photo-fermentative bio-hydrogen production(PFBP)system is designed.In this paper,several factors that affected the continuous cultivation and steady supply of the cultivating device are investigated.Through the culture assays,the initial bacterial inoculum size,hydraulic retention time(HRT),culture temperature,p H value and illumination intensity are optimized when adopting continuous cultivating system.Under the conditions that inoculum size of 15%,HRT of 48 h,temperature of 30℃,illumination intensity of 2080 Lux,and p H value of 6.8,the bacteria concentration at the discharge hole is maintained at 10%-20%,and the outlet flow kept around 28.96 L/h.Photo-fermentative bio-hydrogen production process is carried out using the optimized culture parameters.The results showed that the continuous cultivating system could satisfy the practical requirement of bacteria supply for the PFBP process,and the technical feasibility of the bacteria-cultivating device is verified.(5)By adjusting the pre-commissioning phase of the biomass photosynthesisanaerobic biological hydrogen production reactor,through the production of the 180-day test run,the whole system is stable,raw material utilization,feed temperature,feed solution p H value,hydrogen production,hydrogen concentration and other process parameters and performance indicators are more smooth.The average hydrogen yield of the system is 42.76m~3,the average hydrogen concentration is 61.78%,the average utilization of raw materials is 62.7%,the average rate of gas production is 5.5m~3 /(m~3·d),it has a good operational stability and high capacity hydrogen efficiency. |
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