Fractal micro channel reactor system for enhancing CO2 absorption, and method thereof

Abstract

The present invention provides a fractal micro channel reactor system for enhancing CO2 absorption, and a method thereof. According to the method, a fractal micro channel reactor system is adopted, such that a CO2-containing gas material and an absorption liquid are respectively and uniformly distributed through fractal micro channels, and then are rapidly mixed and absorbed on fractal micro channel flow collection plates under the following conditions that: pressure is 0.1-8.0 MPa, a temperature is 10-100 DEG C, and a time is 0.001-100 seconds. The system comprises an upper cover plate, a lower cover plate, a mixing absorption unit and a heat exchange unit, wherein the mixing absorption unit and the heat exchange unit are arranged between the upper cover plate and the lower cover plate, are stacked layer by layer in an alteration manner, and are matched and combined. With the present invention, in situ heat exchange and absorption can be performed within a time of millisecond to microsecond, the method is a micro reaction technology capable of achieving rapid amplification, and an efficient absorption technology is provided for separation decarburization in coal chemical industry, natural gas, petrochemical industry, and other fields.

Description

technical field [0001] The invention relates to a CO 2 A fractal microchannel reactor system for high-efficiency absorption, specifically a CO 2 Absorbed Microchannel Reactor Technology. The invention provides a high-efficiency absorbing microchannel reactor technology for decarbonization and carbon capture in the fields of flue gas, synthetic ammonia, oilfield associated gas, natural gas, petrochemical industry, natural gas chemical industry, coal chemical industry and the like. Background technique [0002] Currently, the annual global CO emissions from burning fossil fuels 2 Up to about 20 billion tons, the CO produced by the combustion of fossil energy 2 The total amount accounts for about 82% of the total gas. Due to CO 2 The greenhouse effect caused by the large amount of emissions has made the earth's climate environment increasingly worse. The opening of the "Copenhagen Climate Conference" heralds the CO 2 Emission reduction has reached the level of urgency. ...

AI Technical Summary

Problems solved by technology

[0005] In the microchannel reactor involved in the above-mentioned patent, the structured microchannel absorber adopts the spray dispersion method to realize the mixing of gas-liquid two-phase fluid, although it is more conventional tower type The efficiency of the reactor is high, but it cannot ensure that the gas-liquid two-phase ratio in each channel is uniform, resulting in a decrease in absorption efficiency, and from the disclosed content, this kind of regular microchannel will become its best choice in terms of material selection and preparation. The main constraint factor for large-scale application, that is, it is difficult to meet the requirements of mass production

And it is impossible to achieve a high degree of integration of micro-heat exchangers and micro-absorbers layer by layer, and it is difficult to achieve in-situ efficient heat exchange in the absorption or desorption process

Patent US 20100024645 emphasizes the energy utilization of the microchannel separation system, while US 20060073080 only enhances mixing from the size of the holes or the length of the hole extension, and also involves heat exchange with the microchannel heat sink, but for this kind of pore distribution and microchannel Structural synergistically enhanced mass transfer studies have not addressed, or at least not disclosed, microreactor geometries for synergistically enhanced mass transfer

For a mixing unit, the mixing effect of the fractal channel mixer disclosed in the patent CN 101116798A is better, but for the multi-chip stacking parallel amplification process, there will be disadvantages such as uneven fluid distribution and heat exchangers that cannot be stacked and integrated, which may cause It is difficult to achieve multi-chip stacking and parallel amplification

Images