Waste-to-energy plant

A Waste-to-Energy plant comprising:

• an incineration chamber in which waste is combusted generating hot flue gas;
• at least one economizer to heat feedwater using heat from the hot flue gas;
• at least one evaporator to produce steam from the heated feedwater using heat from the hot flue gas;
• at least one steam drum configured to receive the heated feedwater from the at least one economizer and to serve as a supply of heated feedwater, the at least one steam drum further configured to receive the steam from the at least one evaporator and to serve as a supply of steam;
• and
• at least one superheater to receive the steam from the at least one steam drum and to further heat the steam to a superheated steam using heat from the hot flue gas;
• wherein the incineration chamber comprises a first phase change material (PCM)-wall and a second PCM-wall each comprising a plurality of pipes and a layer of PCM provided between the pipes and the incineration chamber, the plurality of pipes in the first PCM-wall receiving the heated feedwater from the steam drum and producing steam in the plurality of pipes in the first PCM-wall using radiant heat from the incineration chamber, and the second PCM-wall heating steam in the plurality of pipes of the second PCM-wall using radiant heat from the incineration chamber.