The Study Of Solar Microorganism Hydrogen Production System

It's very important to carry out a research on the hydrogen production of solar microorganisms because of the more and more critical problems of energy conservation and environmental problems. The microorganism uses solar energy as its energy source and use CO2 as its carbon source. The following are the main contents:(1) Based on the radiative heat transfer equation (RTE) and the experimental results on the radiation characteristics of the microorganisms, the radiative transfer equation on photobioreactor, the total hydrogen production rate and the solar to hydrogen energy conversion efficiency, were studied. The diffused irradiance was solved by the discrete ordinates method in 24 directions, which was more proved to be more precise than the previous reports. On the boundary, both the collimated radiation and diffuse radiation were considered.(2) According to the characteristics of the microorganisms, it was found when the solar spectral irradiance was lower than 67.0W/m2, the microorganisms was not predicted to product hydrogen. The spectral irradiance absorption threshold was based on the experiment overseas. If only one single kind of microorganism in the system, comparing to the graphic of solar spectral radiation intensity, the microorganisms can't fully make use of the solar energy. The sybiotic system was presented and analyzed.(3) The contours and graphs of the light intensity in the photobioreactor, the photobioreactor thickness, the mass production and the light efficiency were analyzed to optimize the hydrogen production of the photobioreactor. The results show that as the increase of the concentration and thickness, the light intensity in the photobioreactor is decreases progressively and then there may be appeared dark zone. Under the same total concentration and thickness, the total hydrogen production rate and the light efficiency are biggest when the proportion of the two microorganisms is 4:1.(4) The numerical simulation of the photobioreactor with different parameters and different boundary conditions were provided. It shows that the appropriate thickness, concentration, microorganism proportion can improve the mass production and light efficiency.