问题 问答题 简答题

请叙述高炉大修后烘炉的目的和用热风烘炉的方法。

答案

参考答案:

(1)烘炉的主要目的是缓慢地除去高炉内衬中的水分,提高其固结强度,避免开炉时升温过快水汽迅速逸出致使砌体爆裂和炉体剧烈膨胀而损坏设备。

(2)热风烘炉方法:

①在均匀间隔的部分风口设热风导入管,管头下弯至炉底一定距离(1~1.4m),并均匀分布在炉缸截面上。铁口设废气导出管,炉顶放散阀适当开度(约开1/3),选定风量(1/4~3/4)按烘炉曲线调风温。

②350m3以下的高炉可不设热风导入管,在风口上放置铁板,挡风板与炉墙间隙约0.3m。更小的高炉可只设铁口废气导出管。

升温曲线要求:粘土砖在300℃左右膨胀系数较大,在此温度应恒温8~16h。粘土及高铝砖,最高风温不超过600℃。碳砖不超过400℃。烘炉期间炉顶温度不超过400℃。无料钟炉顶不超过300℃。其密封室通氮气,保持不超过45℃。烘炉初始风温为100℃左右。提高风温速度300℃以前一般为20~40℃/h,300℃以后一般为30~50℃/h。

完形填空

根据短文内容,完成文后任务。注意:每个空格只填一个单词。

Jerome Kern is often called the father of American musical theater. Kern is remembered for the hundreds of songs he wrote for musical plays and movies. Music historians say that Kern gave artistic importance to American popular music for the first time. And, they say, he led the development of the first truly American theater music.

Jerome Kern was born into a middle-class family in New York City in 1885. Jerome's mother, Fanny, loved the piano. She began to teach Jerome how to play when he was very young.

Jerome was a quiet boy and not a top student. When he completed high school, his father said he would have to work in the family's store. But he later came to believe that Jerome might do better in music than in business after all. So he let the boy go to Europe to study music, as almost all serious young musicians did at the time.

Jerome Kern began his career as a songwriter in theaters in London and New York City. Success came quickly. By the early nineteen twenties, Kern was a successful young composer for Broadway musical comedies. In one three-year period alone, he wrote music for nineteen shows.

Kern wanted to try something completely new. He thought a musical play should be a real work of art, not just a collection of songs and dances. Kern wanted to do a truly American musical, with real American characters and real situations.

In 1927, he found the story he wanted. It was the book "Show Boat" by American writer Edna Ferber. "Show Boat" takes place in the 1880 on a passenger steam boat that travels along the Mississippi River.

Kern died in 1945 at the age of sixty. But "Show Boat" has been performed thousands of times

all over the world.

单项选择题 A1/A2型题