Electrochemical installation operating at high temperature and associated process

An electrochemical installation, comprising:

• a plurality of stacks configured to carry out electrochemical reactions;
• a heating furnace comprising a chamber configured to receive each stack of the plurality of stacks, and a heater, wherein the heating furnace includes a neutral gas injector in the chamber, configured to generate, during operation of the heating furnace, a gas overpressure in the chamber;
• at least one rack, the at least one rack including a rack self-supporting structure which includes a plurality of superimposed stack stages and/or the at least one rack including a plurality of rack self-supporting structures which define a plurality of superimposed stack stages,
• each rack self-supporting structure comprising a fluid distributor configured to supply each stack with at least one fluid and/or to collect at least one fluid from each stack,
• the chamber being configured to contain the at least one rack, whereby the superimposed stack stages of the at least one rack contained in the chamber being configured to be jointly heated by the heater.