Preparation Of High Temperature Heat Storage Concrete And Research On Heat Storage System

The current issue of how to deal with the balance between the environment and energy is a common problem for countries.With the incessant development of world culture,a good deal of non-renewable source is expened.In the meantime,the cost of primary energy source is piecemeal augmenting,a large number of mineral fuel is expended,and the pollution to the environment is becoming increasingly serious.On account of people’s awareness of environmental protection has gradually improved,renewable energy has been respected by people last several years,which has been kept a watchful eyes on by all countries.Solar energy is a kind of clean energy with huge reserves.Using solar energy to generate electricity is a good means to solve environmental and energy problems at present,and has a good development prospect.The preponderance of solar thermal power generation is that it can be equipped with heat storage system to balance the intermittent and unstable solar energy.The using of heat storage system can effectually improve the workpiece ratio of generate electricity,afterwards decrease the cost of power generation.Meanwhile,it is of major meaning to improve the stability and responsibility of power generation.The key to study the heat storage system is to study the heat storage material,which is a sort of heat storage material in the field of solar photothermal power generation with excellent performance and low cost.In this paper,the heat storage material of concrete is studied,and the heat storage system is studied briefly.The specific contents are as follows:Three kinds of concrete proportioning schemes with different mix ratios are designed.Aluminate cement is used as cementitious material and basalt as coarse aggregate to prepare concrete test block.The results show that the concrete prepared with sand ratio of 0.45 and water-to-cement ratio of 0.33 has good compressive performance and strength of 45.40 MPa,so the foundation mix ratio of heat storage concrete is determined.The thermal properties of the prepared concrete test blocks were tested by replacing river sand with magnetite sand.The results showed that the thermal storage concrete had good thermal properties when the substitution amount of magnetite sand was 40%.The specific heat capacity was 109% higher than that of magnetite sand concrete 2.91 J/(g·°C),and the thermal conductivity increased by 16% to 1.43 W/(m·K).The thermal power and heat release of concrete from room temperature to 150℃ are calculated at the same time.When the substitution amount of magnetite sand is 40%,the thermal power is 72.79 W,the heat release is 655.10 k J.The heat release is obtained.The domino offect of graphite,basalt powder and iron powder on the thermal properties of heat storage concrete is studied.When the graphite content is 3%,basalt powder is 2% and iron powder is 3%,the concrete has excellent specific heat capacity and thermal conductivity,the maximal specific heat capacity is 3.07 J/(g·°C)and the thermal conductivity is 1.84 W/(m·k).Compared with ordinary concrete,the specific heat capacity is 121% and the thermal conductivity is 50%.Taking into account the high temperature operation of concrete,the hyperthermy heating was carried out,and the compressive measurement of the heated concrete was carried out.The compressive strength of 100℃,200℃,300℃ and 400℃,in addition to this the compressive strength of heat storage concrete after 50 cycles of high temperature heating at 300-400℃ were tested.The results displayed that the compressive strength of concrete was reciprocal ratio to the heating temperature,and the more times of cyclic heating,the compressive strength of concrete decreased obviously,accompanied by cracks.Finally,based on the thermal properties data of concrete prepared by the experiment,the heat storage system of concrete is simulated by ANSYS software,and the effect of pipe spacing on heat storage performance is studied.When the tube spacing is 0.06 m,the heat storage material can complete the heat filling course rapidly and the heat storage efficiency is higher.