Novel biomass synthesis gas directional preparation and blast furnace smelting coupling co-production process

Abstract

The invention provides a novel biomass synthesis gas directional preparation and blast furnace smelting coupling co-production process, which is characterized in that a biomass synthesis gas preparation unit is combined with a blast furnace, and prepared biomass synthesis gas is directly injected into the blast furnace instead of pulverized coal; meanwhile, top gas generated by blast furnace smelting and water vapor converted by sensible heat of slag are circularly applied to a biomass synthesis gas preparation unit and serve as a gasifying agent to be used for preparing synthesis gas; according to an energy mass balance model of blast furnace smelting, the optimal H2 / CO volume ratio of blast furnace injection in theory is calculated, then the process parameters and the corresponding injection amount of a biomass synthesis gas preparation unit are adjusted, the biomass synthesis gas more suitable for blast furnace injection is prepared, and energy mass coupling of the biomass synthesis gas and the blast furnace is achieved. Biomass synthesis gas preparation and blast furnace smelting are coupled, energy loss is reduced, the production cost of the biomass synthesis gas and the blast furnace is reduced, meanwhile, the lowest energy consumption and carbon emission of blast furnace smelting are achieved, and the purposes of energy conservation and emission reduction are achieved.

Description

technical field [0001] The invention relates to the technical field of blast furnace smelting, in particular to a new process for coupling and co-production of directional preparation of biomass synthesis gas and blast furnace smelting. Background technique [0002] Blast furnace-converter is the most important iron and steel production process in my country at present and for a long period of time in the future. As a steel industry based on carbon metallurgy, blast furnace ironmaking accounts for about 70% of energy consumption and carbon emissions in the iron and steel industry, which is an energy-saving technology. The main battlefield of emission reduction. In the blast furnace injection process, a large amount of pulverized coal needs to be consumed to reduce the coke ratio, thereby reducing coking pollution and improving the economic benefits of iron and steel enterprises. H produced during the combustion of pulverized coal 2 It can increase the reduction ability and ...

AI Technical Summary

Problems solved by technology

However, my country's high-quality coal resource reserves are less than 8%, and blast furnace pulverized coal injection still consumes non-renewable fossil energy in essence

In the process of practical industrial application of traditional biomass gasification technology, there are still the following main problems: (1) Biomass ash has a low melting point and high content of alkali metal elements, and direct combustion is easy to coke and cause high-temperature alkali metal element corrosion ; (2) The gasification equipment has high requirements on raw materials, and the gasification efficiency is low; (3) The tar content in the gas is high, and the quality and calorific value of the synthesis gas are not high

Images