External heating type vertical rotary kiln

Abstract

The invention relates to an external heating type vertical rotary kiln. The external heating type vertical rotary kiln comprises a heating furnace, a rotary tube, a spiral rotary system, a heating system and a heat exchange system, wherein the heating furnace is vertically arranged; multiple layers of partition plates are arranged in the heating furnace for dividing the heating furnace into multiple independent small kilns in the vertical direction; the rotary tube is vertically arranged in the heating furnace; a spiral blade is vertically arranged in the rotary kiln; the heating system comprises burner nozzles, a pressurized air pipeline and a coal gas pipeline; the pressurized air pipeline and the coal gas pipeline separately communicate with the heat exchanger; pressurized air and coalgas, which are heated by the heater, enter the burner nozzles to burn; multiple groups of burner nozzles are arranged on the side wall of the heating furnace; the heat exchange system comprises a heatexchanger and a gas return pipeline, the heat exchanger communicates with the gas exchange pipeline, and the top end of the gas return pipeline is provided with a draught fan. The external heating type vertical rotary kiln is small in floor space, is low in energy consumption, is short in reduction time, and is environmentally friendly. The invention relates to the technical field of metallurgical equipment.

Description

technical field [0001] The invention relates to the technical field of metallurgical equipment, and more specifically relates to an externally heated vertical rotary kiln. Background technique [0002] China's current direct reduced iron production process mainly adopts the coal-based tunnel kiln method. Due to the depletion of coking coal resources, blast furnace ironmaking will also stop, so direct reduced iron will become the main method of ironmaking. The traditional coal-based tunnel kiln method The traditional method has problems such as large area, high energy consumption, long reduction time, high labor consumption, and serious environmental pollution. Although my country is the largest country in the world in steel production, the annual output of direct reduced iron only accounts for 50% of the world's total output. About 1%, a large amount of direct reduced iron needs to be imported every year. The direct reduced iron produced by the traditional tunnel kiln process ...

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Problems solved by technology

[0002] China's current direct reduced iron production process mainly adopts the coal-based tunnel kiln method. Due to the depletion of coking coal resources, blast furnace ironmaking will also stop, so direct reduced iron will become the main method of ironmaking. The traditional coal-based tunnel kiln method The traditional method has problems such as large area, high energy consumption, long reduction time, high labor consumption, and serious environmental pollution. Although my country is the largest country in the world in steel production, the annual output of direct reduced iron only accounts for 50% of the world's total output. About 1%, a large amount of direct reduced iron needs to be imported every year. The direct reduced iron produced by the traditional tunnel kiln process can no longer meet the actual demand of the market. Therefore, it is necessary to improve the existing technology

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