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[单选题]废气锅炉出口排烟温度t2不待低于160—170℃,不正确的原因是()。
A. t2降低需增加锅炉受热面积,锅炉造价提高
B. t2降低需增加锅炉受热面积,排气流动阻力增加
C. 废气锅炉排气流速减小,烟道易脏堵
D. t2降低,能够回收的排气余热过多
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