Energy-saving blast furnace system for self-supplying oxygen-enriched air by using waste heat and pressure

Abstract

The invention discloses an energy-saving blast furnace system utilizing waste heat and excessive pressure to supply oxygen-enriched air itself. The energy-saving blast furnace system comprises an iron making subsystem and an enriched oxygen production subsystem, wherein the enriched oxygen production subsystem comprises two groups of absorption / desorption towers and a compressor providing compressed air for the absorption / desorption towers, a flue gas channel, an air channel and a heat exchange medium channel are arranged in each absorption / desorption tower, an inlet and an outlet of the flue gas channel are respectively connected with a flue gas outlet and a chimney of the iron making subsystem through pipes, an inlet and an outlet of the air channel are connected with the outlet of the compressor and an oxygen-enriched air inlet of the iron making subsystem. The heat exchange medium channels of the two groups of absorption / desorption towers are communicated end to end to form a circulating channel for heat absorption and reuse. Valves are arranged on the flue gas channels and the air channels. The recovery utilization rate of waste heat is improved, coke carbon consumption of a blast furnace is reduced, and pig iron yield is improved.

Description

technical field [0001] The invention belongs to the technical field of blast furnace design, and in particular relates to an energy-saving blast furnace system which uses waste heat and pressure to self-supply oxygen-enriched air. Background technique [0002] The steel industry is the lifeblood of the national economy. According to the global steel production and stainless steel production reports, China ranked first in the world with 823 million tons of crude steel production in 2014, accounting for 49.5% of the global crude steel production. The amount of waste heat resources in my country's iron and steel industry is as high as 455.1kg standard coal / ton of steel, and the current recycling rate is only half of that of developed countries such as Japan and Germany. It can be seen that the recovery potential of waste heat resources in my country's iron and steel industry is huge. [0003] At the same time, the application of blast furnace oxygen-enriched coal injection tec...

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Problems solved by technology

Depend on figure 1 It can be seen that the current utilization of high-temperature flue gas waste heat in hot blast stoves is still mainly based on preheating combustion-supporting air and blast furnace gas. Only a small part of the energy is used, and most of the energy is discharged in the form of heat. underutilized

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