H2-SCR system for reforming alcohol water steam into hydrogen

Abstract

Disclosed is a H2-SCR system for reforming alcohol water steam into hydrogen. The downstream end of a DOC catalytic converter of an engine exhaust pipe is sequentially communicated with an alcohol water solution evaporation reforming hydrogen box, an H2-SCR reduction box and a sound eliminator; the alcohol water solution evaporation reforming hydrogen box comprises a box body, a tail gas passing pipe and an alcohol water solution evaporation pipe; a sealed cavity between the box body and the tail gas passing pipe is separated into an alcohol water steam chamber, a reforming hydrogen chamber and a hydrogen chamber through two screen-shaped baffles; the reforming hydrogen chamber is filled with an Ir-CeO2 catalyst and is provided with a temperature sensor; the hydrogen chamber is communicated with the tail gas passing pipe, and an alcohol water solution evaporation pipe is arranged in the tail gas passing pipe; an inlet of the alcohol water solution evaporation pipe is connected with a liquid electric metering pump through an alcohol water solution conveying pipe, and an outlet of the alcohol water solution evaporation pipe is located in the alcohol water steam chamber; molecular sieve based catalysts and an NOx concentration sensor are arranged in the H2-SCR reduction box; and the NOx concentration sensor, the temperature sensor and the liquid electric metering pump are all electrically connected with a controller.

Description

technical field [0001] The invention relates to the technical field of exhaust gas emission from diesel internal combustion engines, in particular to a method of reforming ethanol water vapor into hydrogen to produce H 2 -SCR system. Background technique [0002] The frequent occurrence of extreme weather in the world today is directly related to the fact that human beings are inseparable from fossil energy. China's factor-driven and rough development in the past 30 years is unsustainable. Of course, fossil fuel-based vehicles are also a big culprit, especially diesel internal combustion engines that use diesel as fuel. Exhaust emissions from diesel internal combustion engines or diesel vehicles mainly include: carbon monoxide (CO), hydrocarbons (CH), nitrogen oxides (NO x ), particulate matter (PM), water vapor (H 2 O) and excess air, of course oxygen (O 2 ). my country's National IV emission standards for motor vehicles have been implemented for nearly two years, and ...

AI Technical Summary

Problems solved by technology

Through the set structure, it can make full use of the waste heat of the exhaust gas discharged by the internal combustion engine, vaporize the ethanol aqueous solution, and make the ethanol (C 2 h 5 OH) and water (H 2 O) Under the action of the catalyst in the ethanol steam reforming hydrogen box, the reforming chemical reaction occurs to produce hydrogen, and the hydrogen is in H 2 -Reaction to eliminate nitrogen oxide (NO) under the action of catalyst in the SCR reduction box X ), nitrogen oxides are converted into harmless nitrogen (N 2 ), and finally nitrogen, carbon dioxide and water vapor are discharged from the muffler, which effectively solves the NO emission from diesel internal combustion engine exhaust X Pollution problem, good for environmental protection

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