高爐下部焦爐氣及粉煤共吹模擬分析

Numerical Study of COG and PC Co-injection in the Bottom of Blast Furnace

岳祺(Chi Yueh) ； 許聖彥(Sheng-Yen Hsu) ； 黃峻豪(Jyun-Hao Huang)

《燃燒季刊》 120期 (2023/02) Pp. 38-45

https://doi.org/10.30041/CQ.202302_(120).0005

摘要

本研究利用雙噴鎗－鼓風區－風俓區之三維模型，以數值模擬探討粉煤（PC）與富氫氣體（COG）噴吹進入高爐爐下部的燃燒情況。模擬結果發現COG富氫氣體火焰的點燃位置會大幅提前至鎗口尖端附近，造成鼓風管內壓力變大，增加鼓風管的熱負荷，並影響粉煤的點火位置及風徑區的燃燒情形。增加COG噴鎗保護氣體流量可使點火位置後移至風徑區內，但會使風徑區溫度下降，造成粉煤燃燒效率不佳。在富氧鼓風環境下，粉煤的平均燃燼率有提升，也改善噴吹COG造成風徑區溫度降低的問題。

關鍵字

雙鎗 ； COG ； 氫氣 ； 高爐

並列摘要

In this study, a three-dimensional model of the double lance, blast pipe, and raceway is used to simulate the combustion characteristics of pulverized coal (PC) and coke oven gas (COG) co-injected into the lower part of the blast furnace. The simulation results show that the ignition position of the COG flame is greatly advanced near the tip of the nuzzle, leading to the increases of pressure and heat load in the blast pipe and affecting the ignition position and burning efficiency of PC in the raceway. Increasing the gas flow rate of the protection gas of COG lance can cause the ignition position move back to the raceway, but it also results in the temperature decrease in the raceway and poor combustion efficiency of pulverized coal. The oxygen-enriched blast hot air can enhance the average burnout rate of pulverized coal and make up for the temperature drop in the raceway caused by the COG injection.

並列關鍵字

double-lance ； COG(coke oven gas) ； Hydrogen ； blast Furnaces