推荐回答(1个)
捣固焦炉高压氨水烟尘输导效果的影响因素
1
捣固焦炉装煤烟尘治理存在的问题
装煤烟尘治理技术一直是各大焦化企业环保工作研究的重点和难点,尤其
是捣固焦炉,
因采用侧装煤,
装煤时机侧炉口长时间处于敞开状态,
致使大量的
荒煤气从机侧炉门逸出,
难以控制。
此外,
由于捣固焦炉与顶装焦炉在装煤工艺
上存在的差异,
致使其装煤烟气的发生量也远大于顶装焦炉。
如不采取有效措施,
对装煤烟尘进行输导和净化处理,势必对环境造成较大的危害。鉴于上述原因,
近年来,众多研究单位对捣固焦炉装煤烟尘输导和净化处理技术展开了相关研
究,
其中,
高压氨水无烟装煤技术得到了广泛应用。
该技术旨在充分利用高压氨
水的射流引射作用,
在上升管根部产生足够的吸力,
将装煤时产生的大量烟气导
入炭化室,以便有效地减少装煤时从炉顶和机侧炉口逸出的烟尘量。
本文在总结科研成果的基础上,
对影响高压氨水在捣固焦炉生产中装煤烟尘
输导效果的各项因素进行了详细论述,
以求进一步优化和完善捣固焦炉装煤烟尘
的治理技术,实现对装煤烟尘的合理控制。
2
高压氨水烟尘输导效果的影响因素
2.1
高压氨水的喷嘴结构
高压氨水的喷嘴结构直接关系到高压氨水射流引射作用的强弱,
从而对上升
管根部吸力的大小和消烟效果的影响较大,
主要原因是射流引射作用的强弱取决
于射流边界层厚度和紊动强度的大小。
若喷嘴结构过于简单,
则会造成喷出的射
流流速分布均匀,
紊动程度过小,
而不利于液流与气流进行能量交换,
削弱了射
流的引射效果,导致高压氨水消烟效果不理想。
为了提高射流紊动程度,
增强射流的卷吸和掺混作用,
通常需要设法使射流
在喷射时旋转起来,
这样出射后不仅有纵向速度,
而且有径向和切向的分速,
即
形成所谓的旋动射流,
旋动射流的形成一般都需要在喷嘴内加装具有合理结构形
式的导流片。
通过对导流片结构形式的多方考察和实验研究,
发现具有三线四流
道导向芯片结构形式的导流片效果最佳(流道面积比
3.3
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1)
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