Methods, systems and applications for heat exchange

Abstract

Disclosed are a method, a system and use for heat exchange in super-critical or near-critical water gasification process of biomass. The method comprises the steps of: heating a biomass in a first heat exchanger (6) by thermal energy of a heat transfer medium, reacting the biomass in said super-critical or near-critical water gasification process and producing reaction products, cooling the reaction products of the biomass in a second heat exchanger (12) by absorbing the thermal energy of the reaction products to said heat transfer medium, and circulating said heat transfer medium between the first heat exchanger (6) and the second heat exchanger (12), wherein molten salt is used as the heat transfer medium.

Description

technical field [0001] The present invention relates to a method for heat exchange during supercritical or near-critical water gasification of biomass, the method comprising the steps of: heating the biomass in a first heat exchanger with thermal energy of a heat exchange medium, Reacting the biomass during said supercritical or near critical water gasification and producing reaction products, cooling the reaction products of the biomass in a second heat exchanger by absorbing thermal energy of the reaction products into said heat exchange medium , and circulating the heat exchange medium between the first heat exchanger and the second heat exchanger. [0002] The invention also relates to a system for heat exchange during supercritical or near-critical water gasification of biomass, the system comprising: a first heat exchanger for heating said biomass, for cooling said biomass A second heat exchanger for the reaction product of the supercritical or near-critical water gasif...

AI Technical Summary

Problems solved by technology

Unfortunately, known heat exchangers do not work well in hydrothermal gasification and / or liquefaction processes due to the harsh requirements of the process conditions and the heterogeneous properties of biomass

[0009] A serious problem with conventional tube heat exchangers is the high pressure on both sides of the tubes, i.e. the material flow inside the tubes and the heat exchange medium outside the tubes must be pressurized to high pressure (for example, 221bar) to obtain a sufficiently high temperature

This causes solid or highly viscous fluids such as tar and char to accumulate on the surfaces of the flow channels of the heat exchanger, resulting in increased resistance to flow and blockage of said channels

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