| Hydrogel is an emerging material used for photothermal distillation.Photothermal distillation is currently mainly used to treat high salt water,it is an environmentally friendly,green and energy-saving water treatment method.At present,the problem that hydrogel is used in photothermal distillation is that the preparation method is complicated and the cost is high.In addition,the influence of various factors in the hydrogel distillation process has not been fully elaborated.In this thesis,the biological macromolecular hydrogel is prepared by applying foaming technology to the hydrogel preparation process.The preparation method has the characteristics of low energy consumption,low cost and simple operation.In this paper,the effect of preparation conditions and environmental conditions on the evaporation rate of biomacromolecule hydrogels is mainly tested by photothermal evaporation experiments to determine whether it is suitable for the treatment of high-salt wastewater.The COMSOL software was used to numerically simulate the hydrogel evaporation process to determine the effects of various internal factors,environmental factors,and reactor factors on the hydrogel photothermal evaporation efficiency.By changing the amount of DA and the type and amount of blowing agent to determine the best conditions for preparing hydrogels.Through the photothermal evaporation experiment,it was determined that the evaporation rate of the biomacromolecule hydrogel under a solar light intensity can reach about 2.6 kg/(m2(13)h).Biomacromolecular hydrogels have good adaptability to changes in salt content and the presence of heavy metal ions.However,in the presence of volatile organic compounds,the evaporation rate of the hydrogel will be significantly reduced.Experiments show that this hydrogel is only suitable for the treatment of weakly acidic and alkaline water bodies.Strongly acidic water bodies will greatly inhibit its evaporation effect.In addition,the evaporation rate of biomacromolecule hydrogels will increase linearly with the increase of sunlight intensity.Since the current research on the factors affecting the hydrogel evaporation is not enough,this paper combines numerical simulation methods to realize the simulation research on the influencing factors,which can not only reduce the time cost and reagent cost required for the experiment,another Aspects can also accurately determine the magnitude of an influence factor.It provides a certain theoretical basis for the direction of hydrogel improvement in the future.The simulation found that as the thermal conductivity of the material increases,the evaporation efficiency of the hydrogel will also increase.The higher the porosity and surface absorbance,the higher the evaporation efficiency of the hydrogel.The stronger the hydrogel’s ability to absorb water,the higher its evaporation efficiency.In addition,it was also found that both environmental temperature and atmospheric pressure can increase the evaporation efficiency of the hydrogel.The increase in solar radiation does not affect the energy utilization of the hydrogel evaporation process..In addition to these,some methods for optimal management of energy consumption are proposed by simulating the influence of reactor factors on hydrogel evaporation.The simulation found that the suspended evaporation method is better than the overhead evaporation method.The larger the contact area with the water body,the lower the energy loss on the surface of the hydrogel,and the overall energy utilization rate increases slightly.The lower the thermal insulation performance of the support material,the higher the energy utilization rate corresponding to the hydrogel.It is proposed that the suspension type evaporation method should be used,the contact area with the evaporation liquid should be increased,and the support material with poor thermal insulation performance should be used for evaporation to improve the evaporation rate of the hydrogel. |
