转炉高温烟气中石灰石粉的分解特性研究

doi:10.19964/j.issn.1006-4990.2022-0711

Abstract

Abstract:

In view of the problems of high energy consumption and high cost of limestone calcination process in lime kiln，the feasibility of using high temperature flue gas waste heat in converter vaporization cooling flue to decompose limestone powder was discussed.The decomposition characteristic of limestone powder in high temperature flue gas environment of converter and the influence of temperature，time，atmosphere and dust on its characteristic were studied by thermogravimetric analysis experiment and tube furnace experiment.The results showed that CO₂ in flue gas could inhibit the decomposition of CaCO₃ and increase the initial decomposition temperature.However，with the increase of temperature，the reaction rate was increased，the decomposition rate was increased，and the reaction time was decreased.The main components FeO and Fe₂O₃ in smoke dust could promote the decomposition of CaCO₃.CaCO₃ grains were decomposed into CaO grains，CO₂ gas was released，and the pores on the surface of the grains was increased obviously，so the activity was increased.The experimental results preliminarily verified the feasibility of using high temperature flue gas waste heat from the converter to decompose limestone powder.

Key words: high temperature flue gas of converter, limestone powder, smoke dust, decomposition characteristics, calcium oxide

CLC Number:

TQ132.32

CHEN Xiaoqing, ZHOU Jian′an, WANG Yi, HAN Juan, WANG Bao, PEI Peiyan. Study on decomposition characteristic of limestone powder in high temperature flue gas of converter[J]. Inorganic Chemicals Industry, 2023, 55(10): 70-77.

Figures/Tables 14

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烟尘添加量/%	初始质量/mg	实际剩余质量/mg	理论剩余质量/mg	分解率/ %
0	10	5.77	5.40	96.1
10	9	6.25	6.04	94.7
30	7	6.99	6.92	97.7
50	5	7.91	7.80	95.0

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Study on decomposition characteristic of limestone powder in high temperature flue gas of converter

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