Preparation And Performances Investigation Of Thermal Storage Material In Solar Thermal Power Plants

The thermal storage concrete is a kind of special material which has a quality of high temperature resistance, high thermal conductivity and thermal capacity. Due to those features,this special concrete can be used as a good thermal storage material. In solar thermal power plants, the concrete can store energy during the day time,and release the energy when power station is lack of energy, so it can balance the situation which is lack of sunlight and without heat sources at night. The prospects of such material engineering application are very broad. Comparing to other materials, it has many advantages, such as low-cost, easy on-site construction, high specific heat, good mechanical properties, thermal expansion co The thermal storage concrete is a kind of special material which has a quality of high temperature resistance, high thermal conductivity and thermal capacity. Due to those features,this special concrete can be used as a good thermal storage material. In solar thermal power plants, the concrete can store energy during the day time,and release the energy when power station is lack of energy, so it can balance the situation which is lack of sunlight and without heat sources at night. The prospects of such material engineering application are very broad. Comparing to other materials, it has many advantages, such as low-cost, easy on-site construction, high specific heat, good mechanical properties, thermal expansion coefficient, the aggregate of concrete that is cheap the easy obtained, repeatedly load thermal cycling. efficient, the aggregate of concrete that is cheap the easy obtained, repeatedly load thermal cycling. The thesis mainly study for concrete destruction under high temperature conditions.By optimizing the design, we can improve its quality of high temperature resistance, and make it meet the requirement of the thermal energy storage materials’performance.The main research of this paper are as follows:We prepared different types of mortars by ordinary portland cement, slag cement, aluminate cement. According to compressive strength, XRD, NMR and other testing means,we analysis the mortar’s strength, composition, suructural characteristics after high temperature. We find that doping with40%slag powder and60%ordinary portland cement has a good high temperature performance. In the post-heating process, the slower the heating rate can significantly reduce the heat damage of concrete. According to this, we can determine the initial heating system.Changing the water-cement ratio and mortar, we found that the lower water-cement ratio and cement-mortar ratio can significantly improve the heat resistance. After the strength tests and SEM analysis, it showed that, a certain amount of organic fibers can significantly improve the heat resistance of the thermal storage concrete.Comparison with ordinary limestone aggregate, aggregate basalt, diabase aggregate, we found that the basalt aggregate concrete block have a better residual strength. What is more,basalt’s thermal performance is significantly better than the other two aggregates, so we choose basalt as a heat-resistant concrete aggregates. And then,we determine a mix of themal storage concrete.In this paper, we mainly use industrial waste,such as slag sand,copperore,and graphite powder to improve the thermal performance of the concrete.With those technical means, the thermal performance of themal storage concrete improved significantly.When we doped with copper and graphite, the thermal conductivity of concrete increased by145.4%.