Moving bed reaction furnace for producing sponge iron by direct reduction of gas base

Abstract

The invention provides a moving bed reaction furnace for producing sponge iron by direct reduction of a gas base. The moving bed reaction furnace comprises a slightly expanded upper large head section(1), a middle cylinder section (2) and a lower cone section (3) which are connected in sequence from top to bottom in a furnace body height direction; the slightly expanded upper large head section is provided with an exhaust outlet (12) and a solid material uniform distributing sliding pipe (11); exhaust gas dust entrainment is reduced by the slightly expanded upper large head section; the middle cylinder section is provided with a reducing gas inlet (21) and a gas distributor (22); the gas distributor achieves gas distributing and solid material rectifying effects; the lower cone section is provided with a cooling gas inlet (32), a solid material outlet (33) and a vertical spiral loosing device (31); low-temperature solid material discharging is realized in the cooling gas inlet; afterheat of a solid material is realized; the vertical spiral loosing device realizes axial circulating and radial rotating movement of a solid material on a bed layer; sintering of a bed layer is thoroughly avoided; and smooth discharging at an outlet is ensured.

Description

technical field [0001] The invention belongs to the technical field of metallurgical equipment, and in particular relates to a moving bed reaction furnace for gas-based direct reduction to produce sponge iron. Background technique [0002] With the rapid development of the world's steel industry and the increasing attention paid by the international community to environmental protection, direct reduced iron technology has received more and more attention from the steel industry, and the demand for direct reduced iron has grown strongly. In 2018, the global direct reduced iron production breakthrough 100 million tons. [0003] Gas-based direct reduction processes for producing sponge iron mainly include Midrex and HYL. First of all, due to the high dust content in the furnace top exhaust gas in the existing process, the load of the subsequent cooling and dust removal process is increased; secondly, the reducing gas directly enters the reaction furnace from the cylinder witho...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a moving bed reaction furnace for the production of sponge iron by gas-based direct reduction in view of the technical defects of the existing gas-based direct reduction production of sponge iron. The reaction furnace is designed by the large diameter and height of the upper slightly enlarged head It solves the problem of high dust content in the exhaust gas at the top of the furnace; the design of the gas distributor ensures the uniformity of the reduction reaction in the furnace body, and at the same time, the vertical screw loosening device is installed to solve the problem of coking and clogging of solid materials

Images