Diesel engine exhaust gas waste heat recycling system based on methanol steam reforming hydrogen production

Abstract

The invention provides a diesel engine exhaust gas waste heat recycling system based on methanol steam reforming hydrogen production. The diesel engine exhaust gas waste heat recycling system based on methanol steam reforming hydrogen production is provided with a reforming hydrogen production reactor for generating hydrogen-rich reformed gas by methanol steam, and is also provided with an adsorption hydrogen storage module with a plurality of hydrogen storage units. According to the system, a heat supply gas path is used for receiving high-temperature waste gas, a waste gas distributor is used for distributing the received high-temperature waste gas to the reforming hydrogen production reactor and the plurality of hydrogen storage units for heat supply according to chemical reaction environment requirements, and the working conditions of the hydrogen storage units can be switched between an adsorption working condition and a desorption working condition; and in the adsorption hydrogen storage module, the hydrogen storage units in the adsorption working condition adsorb and store hydrogen components in the hydrogen-rich reformed gas, and the hydrogen storage units in the desorption working condition release stored hydrogen and supplies hydrogen to external equipment. According to the diesel engine exhaust gas waste heat recycling system based on methanol steam reforming hydrogen production provided by the invention, according to the specific emission condition of a marine diesel engine, the waste heat of the waste gas can be recycled through methanol steam reforming, and the part of energy is comprehensively utilized in the modes of entering the engine for blending combustion, metal hydride hydrogen storage and a fuel cell.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of waste heat from exhaust gas of marine diesel engines, in particular to a recovery and utilization system of waste heat from diesel engine exhaust gas based on steam reforming of methanol to produce hydrogen. Background technique [0002] About one-third of the energy consumed by the internal combustion engine is wasted with the emission of exhaust gas. The technology of recycling this part of energy is called waste heat recovery. Waste heat recovery can greatly improve the overall efficiency of the internal combustion engine device. The main ways to recover waste heat from marine diesel engines are turbochargers, exhaust gas boilers and thermochemical recovery. For small and medium-sized ships along the river and coast without exhaust gas boilers, thermochemical recovery is an effective and feasible waste heat recovery scheme. Its purpose is to use the heat of high-temperature...

AI Technical Summary

Problems solved by technology

[0006] At present, the application of waste heat recovery from methanol steam reforming to hydrogen production is relatively single. One is that new energy vehicles introduce the reformed hydrogen-rich gas into the engine for auxiliary combustion, and the other is to use reforming hydrogen as a hydrogen fuel cell. Hydrogen source

The single application of these two methods cannot meet the requirements of waste heat recovery and energy utilization of marine diesel engines: the single inlet mixed combustion is subject to the restriction of the blending ratio of reformed gas and diesel engine intake (hydrogen explosion range is 4-75%, In this range, there will be combustion knocking in the cylinder), the amount of hydrogen-rich reformed gas required is small, and the reforming reactor designed based on this standard is difficult to meet the requirements of fully recovering waste heat; if only used as hydrogen for hydrogen fuel cells If the source is not used, the in-cylinder combustion cannot be optimized through hydrogen blending, so as to achieve the purpose of improving engine efficiency and reducing emissions, which limits the improvement of the overall energy efficiency index of the engine device.

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