Characteristics of operation’s condition and requirement

    Characteristics of operation’s condition and requirement of selection’s type

    We often use the molten salt as the heating medium in requiring high temperature heat. Advantages of using the molten salt is that it can be obtained the temperature of 300～ 500⁰C under atmospheric pressure. It is economic and security which compared with high pressure steam heating. It is easy to manage with direct fire to heat. And it can guarantee the quality of the products. The running characteristics and selecting type of molten salt liquid pump requires below.
    Molten salt is composed of KN03:53%, NaN0:40%, NaN03<7%.The viscosity of molten salt pump is lowest in this proportion. And the viscosity of 480⁰C is 1.5cP. Because of this, the characteristic of the flow is good. The test function’s characteristics of clean water pump can be as function of transporting molten salt. The flow, head and efficiency are not modified, but shaft power is 1.73 times the original.
    You can protect the pump with nitrogen. The oxygen can make the NaNO₃ of high temperature molten salt oxidize to NaNO₃. If so, the viscosity would increase dramatically. Therefore, it should use nitrogen of 0.05 MPa(g) pressure to protect on the liquid level of the molten salt storage tank. Liquid pump seal should be to prevent air leakage into and reduce the nitrogen consumption.
    High temperature molten salt has a strong oxidizing. Because of this, you should avoid touching the reducibility of aluminum, paper and other materials. And you should avoid the lubricating oil into the storage tank. The outlet of the pump must prevent leakage to prevent burns.
    Because the horizontal molten salt pump is difficult to seal and molten salt leakage is risky, so the liquid pump is generally used.
    If you want to shorten the length of the molten salt liquid and improve the operation’s stability, you can design into a horizontal cylinder or vertical cylinder that the high diameter is small.