CAJ | 학술논문

建立了煤粉燃烧率通用模型，模型可以根据煤粉的工业分析值计算燃烧动力学参数并预测煤粉燃烧率。通过对比前人的实验数据，验证了模型的准确性，同时研究了影响高炉煤粉燃烧率的若干因素。研究结果表明：在高炉喷煤过程中，煤粉颗粒在2 ms左右就可以达到热风速度，由于煤粉颗粒在直吹管内停留时间短并且温度较低，因此在直吹管内煤粉不会发生燃烧。煤粉进入风口回旋区后，挥发分瞬间全部析出，并且颗粒粒径越小，挥发分开始析出时间越早。降低煤粉粒径和增加氧气体积分数均有利于提高煤粉燃烧率。氧气体积分数每增加1%，燃烧率提高2%。随着喷煤量的增加，煤粉燃烧率逐渐降低。当提高煤粉喷吹量时，为了保证较高的燃烧率，实际操作过程中应提高富氧率并适当降低煤粉粒径。
건립료매분연소솔통용모형，모형가이근거매분적공업분석치계산연소동역학삼수병예측매분연소솔。통과대비전인적실험수거，험증료모형적준학성，동시연구료영향고로매분연소솔적약간인소。연구결과표명：재고로분매과정중，매분과립재2 ms좌우취가이체도열풍속도，유우매분과립재직취관내정류시간단병차온도교저，인차재직취관내매분불회발생연소。매분진입풍구회선구후，휘발분순간전부석출，병차과립립경월소，휘발분개시석출시간월조。강저매분립경화증가양기체적분수균유리우제고매분연소솔。양기체적분수매증가1%，연소솔제고2%。수착분매량적증가，매분연소솔축점강저。당제고매분분취량시，위료보증교고적연소솔，실제조작과정중응제고부양솔병괄당강저매분립경。
A general model of pulverized coal combustion ratio was put forward, which can calculate the kinetic parameters and combustion ratio based on coal industrial analysis. The accuracy of this model was verified by comparing with previous experimental data. Some factors influencing the coal combustion ratio were discussed. It is found that during the process of pulverized coal injection, the pulverized coal particle can reach the velocity of hot blast within 2 ms. In the blowpipe, due to the pulverized coal particle with short residence time and lower temperature, combustion reaction does not occur. When the pulverized coal particle enters into the race-way, the volatile is released instantly. The smaller the coal diameter is, the earlier the volatile will be released. The coal combustion ratio can be improved by decreasing the coal diameter or increasing the oxygen enrichment. When the oxygen enrichment increases 1%the combustion ratio increases about 2%. With increasing coal injection rate, the coal combustion ratio decreases. Therefore, when the coal injection rate increases, we should increase the oxygen enrichment and decrease the particle diameter appropriately to maintain the high combustion ratio.