Abstract
Swimming Pool-type Low-Temperature Heating Reactor (SPLTHR) is a reactor developed to meet the needs of clean heating in northern China. But the core inlet/outlet temperature of SPLTHR is only about 80/100 ℃. In order to ensure the heating capacity of SPLTHR in winter, it is necessary to increase the outlet temperature of the reactor. Increasing the outlet temperature of SPLTHR will certainly lead to the rise of the pool water temperature, which will affect the bearing capacity and service life of the concrete around the reactor. It is necessary to reduce the concrete temperature around the reactor. In this research, the scheme of constructing a water layer in SPLTHR for thermal insulation is proposed, which is expected to reduce the temperature of the concrete outside the reactor. And we carry out a preliminary study of the static water layer scheme through principle experiments. The results show that there is natural convection in the static water layer. And the heat transfer can be effectively reduced by inverting a vertical partition in the static water layer. After analyzing the heat transfer of the SPLTHR external soil, we find that the disadvantages of the static water layer scheme. Therefore, we put forward an improved scheme, which is to use the low temperature reinjection water of the 1st purification system to cool the thermal insulation layer.
