Rotary hearth furnace and method for treating low-rank coal and iron-containing materials

A technology of low metamorphic coal and rotary hearth furnace, which is applied in the fields of metallurgy and chemical industry, which can solve the problems that the product cannot be directly used, the economic benefit of the product is poor, and the production cost is high, so as to improve the efficiency and effect, prevent insufficient pyrolysis, and prolong the residence time the effect of time

Inactive Publication Date: 2016-08-31
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The current low-metamorphic coal treatment devices often have problems such as high production costs, poor e

Method used

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  • Rotary hearth furnace and method for treating low-rank coal and iron-containing materials
  • Rotary hearth furnace and method for treating low-rank coal and iron-containing materials
  • Rotary hearth furnace and method for treating low-rank coal and iron-containing materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Using lignite and iron concentrate as raw materials, the lignite composition is as follows (mass percentage): moisture 10.19%, ash 1.94%, volatile matter 46.53%, and fixed carbon content 41.34%. The TFe grade of the iron concentrate is 72wt%. The lignite is prepared by drying to a particle size of 8-12 mm, and the iron concentrate is made into pellets with a particle size of 6-8 mm. Firstly, the lignite block is placed on the chain plate of the pyrolysis zone through the inlet of low metamorphic coal, and the distance between the chain plate device and the bottom refractory material is 10cm. The temperature in the pyrolysis zone is 500°C, and the time is 20 minutes. The oil and gas produced by pyrolysis are recovered through the collection and separation device, the yield of tar is 6.51%, the yield of gas is 20.49%, and the calorific value of gas can reach 5476.53Kcal / Nm 3 . The pyrolyzed semi-coke falls from the chain plate at the first retaining wall (18mm from the...

Embodiment 2

[0054] Using long-flame coal and iron ore as raw materials, the coal composition is as follows (mass percentage): moisture 12.03%, ash 2.21%, volatile matter 46.31%, fixed carbon content 39.45%, iron ore TFe grade 48wt%. The long-flame coal is dried to a particle size of 10-14 mm, and the iron ore is made into pellets with a particle size of 8-10 mm. Firstly, the long-flame coal is distributed into the chain plate of the pyrolysis zone through the low metamorphic coal inlet, and the chain plate device is 15cm away from the bottom refractory material. The temperature in the pyrolysis zone is 700°C, and the time is 16 minutes. The oil and gas produced by pyrolysis are recovered through the collection and separation device, the yield of tar is 5.69%, the yield of gas is 31.28%, and the calorific value of gas can reach 5697.82Kcal / Nm 3 . The pyrolyzed semi-coke falls from the chain plate at the first retaining wall (26mm from the bottom) and enters the reduction zone at the bott...

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Abstract

The invention discloses a rotary hearth furnace and method for treating low-rank coal and iron-containing materials. Specifically, the rotary hearth furnace comprises a rotary furnace bottom, a ring-shaped hearth, a first retaining wall, a second retaining wall, a low-rank coal inlet, an iron-containing material inlet, a chain plate device, a pyrolysis oil gas outlet and a reduction product outlet, wherein a pyrolysis area, a reduction area and a discharge area are sequentially formed in the rotating direction of the rotary furnace bottom, a first gap is formed between the bottom end of the first retaining wall and the rotary furnace bottom, a second gap is formed between the bottom end of the second retaining wall and the rotary furnace bottom, and the chain plate device is arranged in the pyrolysis area. Accordingly, the low-rank coal can be utilized comprehensively, pyrolysis oil gas is prevented from being polluted by reducing gas or volatile components generated in the treatment process, and the rotary hearth furnace has at least one of the following advantages of being low in production cost, high in reduction product and pyrolysis oil gas quality, good in economic benefits and the like.

Description

technical field [0001] The invention relates to the fields of metallurgy and chemical industry. In particular, the invention relates to a rotary hearth furnace and method for processing low metamorphic coal and ferrous materials. Background technique [0002] my country's energy reserves, which are rich in coal, poor in oil, and low in gas, determine that my country's energy consumption structure is dominated by coal. Low metamorphic coal, including lignite, long-flame coal, non-caking coal, weakly caking coal, etc., is often used as low-quality fuel thermal coal due to its shortcomings such as high moisture content, high ash content, high volatile matter, and low calorific value. Low-metamorphic coal is easy to oxidize and spontaneously combust, and is not suitable for long-distance transportation, which also increases the difficulty of its processing and utilization. Therefore, how to realize the conversion and comprehensive utilization of low-metamorphic coal resources ...

Claims

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Application Information

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IPC IPC(8): C10B1/10C10B53/04C21B13/00
CPCC10B1/10C10B53/04C21B13/00
Inventor 王欣刘占华曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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