Composite compressed air energy storage system and method for coupling methanol reformer with internal combustion engine

Abstract

The composite compressed air energy storage system comprises a compressed air energy storage unit, a methanol steam reforming unit, a low-dust combustor unit and an internal combustion engine power generation unit which are mutually coupled, and low-grade compression heat, high-temperature exhaust heat of the internal combustion engine and exhaust heat of an expansion machine are fully utilized; exhaust gas of the expansion machine firstly passes through the methanol steam reaction inner pipe to provide energy for methanol reforming reaction, and then passes through the disc-shaped heat exchanger to evaporate a methanol aqueous solution to generate methanol steam, so that stepped utilization of high-temperature exhaust gas energy of the expansion machine is realized, and the energy utilization efficiency is improved; an external heat source of the reactor is avoided while high-temperature exhaust is utilized, so that the system efficiency is further improved; the mixed gas generated by the reforming reaction passes through the low-concentration methanol aqueous solution in the methanol removal chamber, methanol in the mixed gas is absorbed, heat of the mixed gas is absorbed at the same time, recycling of the methanol and the heat is achieved, and the economical efficiency of hydrogen production through methanol steam reforming is improved.

Description

technical field [0001] The invention relates to the technical field of hydrogen production by steam reforming of methanol, in particular to a composite compressed air energy storage system and method in which a methanol reformer is coupled with an internal combustion engine. Background technique [0002] Methanol has the advantages of wide sources, renewable, less pollution of combustion products, rich oxygen, and low cost. Directly using methanol as fuel for internal combustion engines has the disadvantage of low thermal efficiency, and steam reforming of methanol to produce hydrogen is a good solution. The existing methanol Steam reforming hydrogen production reactors generally require an external heat source, which will lead to a large amount of energy loss; and the general preparation method of methanol steam reforming catalyst will cause problems such as gas pollution, solid phase sintering and high manufacturing cost. In the compressed air energy storage system, the lo...

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Problems solved by technology

[0004] The patent application number is: CN202110410652.2, and the patent application titled "A Methanol Hydrogen Production Reactor Based on Engine Exhaust Gas" also discloses a composite system that uses waste heat to replenish heat for the methanol hydrogen production reactor, but its structure is relatively simple , the methanol reaction tube used is a relatively conventional reaction tube, and the exhaust heat of the engine cannot be used in stages

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