Fast pyrolysis heat exchanger system and method
View Patent ↗A fast pyrolysis heat exchanger system for economically and efficiently converting biomass and other combustible materials into bio-oil. The system employs multiple closed loop tubes situated inside the heat exchanger. As a granular solid heat carrier is deposited at the top of the heat exchanger and caused to move downwardly therethrough, heat is transferred from the tubes to the heat carrier which is then transferred to a reactor where it is placed in contact with the combustible materials.
1. A fast pyrolysis heat exchanger system using a granular solid heat carrier comprising:
a) a multi-tube heat exchanger having a hot air input passageway connected to one end of the tubes and a cold air discharge passageway connected to the other end of the tubes;
b) an elevator having an input passageway for lifting the heat carrier from the top of the input passageway to the top of the heat exchanger;
c) a control probe associated with said heat exchanger for sensing the level of heat carrier in the heat exchanger and for regulating the speed at which the elevator operates;
d) an auger located at the bottom of the heat exchanger for controlling the movement of the heat carrier through the heat exchanger and for discharging heat carrier from the auger through an output therefrom.
2. The fast pyrolysis heat exchanger system of claim 1 wherein the elevator comprises a vertical fixed auger contained within a rotating shell.
3. The fast pyrolysis heat exchanger of claim 2 wherein the elevator is airtight.
4. The fast pyrolysis heat exchanger system of claim 1 wherein the auger located at the bottom of the heat exchanger stops the flow of heat carrier from the heat exchanger when not rotating, thereby preventing the heat exchanger from emptying.
5. The fast pyrolysis heat exchanger system of claim 1 additionally comprising a reactor having at least a first reactor input wherein the first reactor input is an inverted funnel shape, thereby preventing bridging of material flowing through the first reactor input.