Low-temperature phase-change material heat storage tank for coal-to-electricity

The invention relates to a low-temperature phase-change material heat storage tank for coal-to-electricity. The low-temperature phase-change material heat storage tank comprises a heat preservation tank, a support, a heat exchange combined coil pipe, a main pipe and a cathode protection sacrificial anode; the heat exchange combined coil pipe is connected to a main pipe and is fixed on the support, and is arranged in the heat preservation pool; the heat preservation tank is used for filling with the low-temperature phase change material, the heat preservation tank is a cement heat preservation deep pool arranged below the ground, a heat preservation layer is embedded in a cement layer, and a glass fiber reinforced plastic layer is arranged on the surface of the cement layer; the heat exchange combined coil pipe comprises a plurality of coiled pipes, each coiled pipe is formed by welding a plurality of heat exchange bent pipes end to end, welding spots are located at the top, the two main pipes are liquid inlet