Abstract: A four-axial-fins fixed bed reactor for use with calcium aluminate carbonates CO2 sorbents is provided. The four-axial-fins fixed bed reactor includes a tubular reactor and a four-axial-fins tube. The tubular reactor has a tubular reactor inner wall. The four-axial-fins tube is disposed in the tubular reactor, wherein the four-axial-fins tube includes a tube and four axial fins. The tube has a tube outer wall. An annular space is formed between the tube and the tubular reactor. The four axial fins extend along the radial direction of the tubular reactor from the tube outer wall to connect the tubular reactor inner wall, wherein the annular space is equally divided by the four axial fins.

Abstract: The present invention provides a membrane reaction apparatus for recovering heat of reaction, which includes a membrane reactor. The said membrane reactor includes a reaction pipeline, a membrane and a sweep pipeline. The reaction pipeline has a reaction space, and an exothermic reaction occurs therein, which generates product gas and heat of reaction. Part of the product gas penetrates through the membrane around the reaction space and enters into the sweep pipeline. Sweeping gas enters into the sweep pipeline and carries the product gas and the heat of reaction away. It is feasible to wrap the product gas around the sweep pipeline, for enhancing the heat transfer from the product gas to the sweeping gas. The heat of reaction brought by the sweeping gas can be further released in a heat exchanger, so that the heat of reaction is available to be recovered and used for other endothermic processes.

Abstract: The present invention provides a membrane reaction apparatus for recovering heat of reaction, which includes a membrane reactor. The said membrane reactor includes a reaction pipeline, a membrane and a sweep pipeline. The reaction pipeline has a reaction space, and an exothermic reaction occurs therein, which generates product gas and heat of reaction. Part of the product gas penetrates through the membrane around the reaction space and enters into the sweep pipeline. Sweeping gas enters into the sweep pipeline and carries the product gas and the heat of reaction away. It is feasible to wrap the product gas around the sweep pipeline, for enhancing the heat transfer from the product gas to the sweeping gas. The heat of reaction brought by the sweeping gas can be further released in a heat exchanger. so that the heat of reaction is available to be recovered and used for other endothermic processes.

Abstract: A membrane reactor with divergent-flow channel includes a reaction pipeline, a membrane and a purge (sweep) pipeline sequentially arranged from inside to outside or from outside to inside. The reaction pipeline has a cross-sectional area increment from the front (upstream) end to the rear (downstream) end, so that the flow velocity of a reactant gas is decreased from the upstream end to the downstream end to extend the residence time of the reactant gas and improve the reaction rate of the reactant gas. The sweep pipeline has a cross-sectional area decrement from the upstream end to the downstream end, so that the flow velocity of a purging (sweeping) gas is increased from the upstream end to the downstream end to accelerate the reactant gas, and a product gas generated from the reaction passes through the membrane and enters the sweep pipeline to improve the reaction efficiency.