Diesel engine waste heat recovery and utilization system based on steam reforming of methanol to produce hydrogen

Abstract

The present invention proposes a diesel exhaust waste heat recovery and utilization system based on methanol steam reforming to produce hydrogen, which is equipped with a reforming hydrogen production reactor that generates hydrogen-rich reformed gas with methanol steam, and also has a multiple hydrogen storage units. Adsorption hydrogen storage module; the system receives high-temperature waste gas through the heating gas circuit, and distributes the received high-temperature waste gas to the reforming hydrogen production reactor and multiple hydrogen storage units for heat supply according to the chemical reaction environment requirements through the waste gas distributor, and the hydrogen storage unit The working condition can be switched between the adsorption working condition and the desorption working condition; in the adsorption hydrogen storage module, the hydrogen storage unit in the adsorption working condition absorbs and stores the hydrogen component in the hydrogen-rich reformed gas, and the hydrogen storage unit in the desorption working condition The hydrogen unit releases the hydrogen stored in it and supplies hydrogen to external equipment; the invention can use methanol steam reforming to recover the waste heat of the exhaust gas according to the specific emission conditions of the marine diesel engine, and through the mixed combustion of the engine, the hydrogen storage of metal hydride and the The way of fuel cell is to comprehensively utilize this part of energy.

Description

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

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.

Images