Reduction shaft furnace
A shaft furnace and cooling gas technology, applied to shaft furnaces, furnaces, furnace types, etc., can solve the problems of increased gas consumption, easy blockage of cooling gas extraction devices, reduction of effective gas components of reducing gas, etc., and achieve the effect of preventing blockage
Pending Publication Date: 2018-05-01
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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Problems solved by technology
[0004] The purpose of the present invention is to solve the problem that in the gas-based shaft furnace direct reduction ironmaking technology, the reduction section and the cooling section in the shaft furnace are connected to each other, causing a small amount of cooling gas to enter the reduction section, reducing the effective gas composition in the reduction gas and increasing the amount of gas Consumption problem, while solving the problem of easy blockage of the cooling air extraction device
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Embodiment
[0044] This embodiment adopts figure 1 The reduction shaft furnace shown processes iron concentrate oxidized pellets.
[0045] Iron concentrate oxidized pellets with a particle size of 8mm-20mm are fed into the furnace from the top of the shaft furnace, and the preheating and reduction process is completed in the reduction section 1, in which high-temperature reducing gas is injected into the shaft furnace from the reducing gas inlet device 2. The high-temperature sponge iron pellets formed after reduction enter the cooling tank 6 through the feeding pipe 3 at the lower part of the shaft furnace. The feeding pipe 3 has a height of 2 m and a diameter of 1 m. The pellets are always filled with pellets, and the pellets are evenly distributed around the cooling tank 6 to form a certain material slope angle. The top of the inner material surface of the cooling tank 6 forms a material-free space, and the cooling air discharge device 5 is arranged in the cooling tank 6. The top of t...
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Abstract
The invention provides a reduction shaft furnace which comprises a reduction section, a reducing gas inlet device, a feeding pipe, a cooling gas inlet device, a cooling gas outlet device and a coolingtank. The reducing gas inlet device comprises a reducing gas bustle pipe and reducing gas jet nozzles. The reducing gas bustle pipe is connected with the reducing gas jet nozzles. The reducing gas jet nozzles are evenly arranged on the same horizontal position of the reduction section. The feeding pipe is connected with the reduction section and the cooling tank, and the feeding pipe is insertedinto the cooling tank. The cooling tank is a cylindrical container lined with a refractory material and is provided with a conical bottom and a discharging pipeline. The cooling gas inlet device comprises a gas inlet bustle pipe and gas inlet jet nozzle, the gas inlet bustle pipe is connected with the gas inlet jet nozzles, and the gas inlet jet nozzles are evenly arranged on the same horizontal position of the conical bottom. The cooling gas outlet device comprises a gas outlet bustle pipe and outlets, the gas outlet bustle pipe is connected with the outlets, and the outlets are evenly arranged on the same horizontal position of the upper portion of the cooling tank. By the adoption of the reduction shaft furnace, the effect that furnace charges are cooled smoothly can be guaranteed, andthe situation that a discharging outlet of the cooling tank is blocked by pellets is prevented.
Description
technical field [0001] The invention belongs to the technical field of metallurgical equipment, and in particular relates to a reduction shaft furnace. Background technique [0002] my country is a big country in steel production. In 2015, the crude steel output in mainland China was 804 million tons, accounting for 49.5% of the global total. However, the structure of the iron and steel industry is unreasonable, with a high iron-steel ratio and a small proportion of electric furnace steel, and some special steel varieties still need to be imported. High, poor economic benefits, has become less and less suitable for the development of the industry, has been gradually eliminated, the current direct reduced iron technology has developed rapidly in the smelting industry, and has been widely used. At present, the direct reduced iron technology The smelting furnaces used are tunnel kilns, rotary hearth furnaces, etc. Due to structural defects, tunnel kilns and rotary hearth furn...
Claims
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IPC IPC(8): C21B13/02
CPCC21B13/02
Inventor 员晓温雨鑫刘亮冯鲁兴唐敬坤曹志成吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST