Biomass pyrolysis-hydrothermal methanation poly-generation process with cross-seasonal energy storage function and device of process

Abstract

The invention discloses a biomass pyrolysis-hydrothermal methanation poly-generation process with a cross-seasonal energy storage function and a device of the process. The device comprises a solid biomass rapid pyrolysis and product separation unit, a hydrothermal methanation unit, a CO2 separation and pressure energy recovery unit, an oil gas energy storage unit, a biochar modification unit and awaste heat recycling unit. Biomass is subjected to rapid pyrolysis and product separation after being crushed and dried, so that gas-phase solid-phase and liquid-phase products are obtained; the mainproduct pyrolytic oil is pressurized and then enters a hydrothermal methanation reactor, crude natural gas with CH2 and CO2 as main components is generated; the CO2 is removed after pressure regulation, and SNG containing high-concentration CH4 is obtained; the pyrolytic gas-phase product cooperates with part of SNG so as to provide heat for rapid pyrolysis and charcoal modification; and the pyrolytic solid-phase product is modified by a physical method. The process of the invention is compact, is flexible in operation mode, achieves the better energy storage capacity and is suitable for comprehensive utilization of urban and rural forestry and agricultural residues, household garbage and other resources.

Description

technical field [0001] The invention provides a method for producing synthetic natural gas and producing heat, electricity and biochar through biomass pyrolysis-hydrothermal methanation with energy storage function, and belongs to the technical field of biogas production and biomass comprehensive utilization. Background technique [0002] my country's natural gas resources are scarce, but the demand is increasing year by year, resulting in the current situation of large supply and demand contradictions, large dependence on foreign countries, large differences between peak and valley consumption in winter and summer, and large differences in urban and rural usage. The vast rural and township areas urgently need clean gas to improve the smoky dilemma in cooking and heating in winter. [0003] Biomass is a renewable resource with huge resources and wide distribution. Replacing fossil fuels with synthetic fuels from biomass gasification is one of the important ways to promote e...

AI Technical Summary

Problems solved by technology

The process has the following disadvantages: many process steps; the steam gasification reactor generally uses a double fluidized bed, which is difficult to design and operate; many parts of the process need to use fans or compressors, and the energy consumption is high; the product is single; Logistics is gaseous, and it is normal pressure and low pressure, so the equipment volume and floor area are large; the process is long and the potential failure rate is high

In traditional biomass storage and storage, due to the small bulk density of biomass raw materials, the required storage volume is huge, and the transportation of a large amount of solids requires a complete set of transportation facilities, which occupies a large area and has a high failure rate

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