Solid/heat-transfer gas reactor comprising gas diffusers with reduced risks of blocking

A solid/heat-transfer gas reactor comprising:

• a plurality of modules stacked in a vertical direction, comprising solid reagents configured to have the heat-transfer gas pass through them;
• wherein each module comprises a plurality of diffusers each including a top portion supporting one of the solid reagents, and a portion for diffusing reactive/heat-transfer gas, situated under the top support portion, and comprising a lateral gas-distribution channel, and a lateral gas-collection channel,
• each module further comprising a double wall between which the gas is configured to circulate before entering through the diffusers, the diffusers projecting upwards from a top wall of the double wall, and wherein any two directly consecutive modules in the stack define a housing cavity receiving one of the solid reagents carried at least partially by the diffusers arranged in the cavity,
• the lateral gas-distribution channels of the stacked modules forming together a vertical distributor supplying gas to each of spaces defined between two walls of the double walls, and
• wherein the lateral gas-collection channels of the stacked modules form together a vertical collector collecting the gas coming from each of the housing cavities.