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聲波清灰器吹灰形態理論研究

2018-11-17 瀏覽量:

篮球即时比分网 ZHENDUIGUOLUCHANGQIJIHUIDEWENTI,CHUIHUIDEZHUYAOZHUANGZHIJIUSHIQINGHUIQI,GUONEIWAIZAICHUIHUIFANGFASHANGHUANZAIBUDUANXUNQIUXINDELILUN,DANGENJUYUANLIZHUYAOYOUZHENGQIQINGHUIQI、RANQIMOCHONGQINGHUIQIHESHENGBOQINGHUIQIZHEJIZHONGXINGTAI。

⑴蒸汽清灰器主要是利用高壓蒸汽的射流沖擊力清除受熱面上的結渣積灰。對于爐膛和高溫區受熱面的粘性大的積灰清除效果較好,但由于采用蒸汽一方面消耗了蒸汽量會降低鍋爐一定的效率;另一方面蒸汽的沖擊力會增加管壁的磨損,還會增加煙氣濕度,使煙氣的露點溫度升高,加強低溫腐蝕;再有蒸汽清灰器屬于接觸式的吹灰,故存在很大的吹灰死角(如下圖)。

吹灰死角

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⑵燃氣脈沖激波清灰器是以適當的比例混合的空氣和可燃氣體(如氫氣、乙炔氣、煤氣、液化氣和天然氣等)為工質,在一特殊的容器中經高頻點火,產生爆燃,瞬間產生巨大聲能和大量高溫高速氣體,對受熱面以沖擊波的形式振蕩、撞擊和沖刷,使其表面積灰飛濺,隨煙氣帶走。這種清灰器由于會產生高溫高速氣體,一方面對管路的密封性能要求比較高,激波吹灰系統整體維護維修量比較大;另一方面由于是利用可燃氣體與空氣的混合爆燃,故存在很大的安全隱患;再一方面,由于利用可燃氣體量大,故運行費用很高;最后、由于是以沖擊波的形式瞬間振蕩、撞擊和沖刷換熱管束表面,屬于接觸式吹灰,故存在很大的吹灰死角,如下圖所示。目前,該類型清灰器被市場慢慢的排斥。

接觸式吹灰

⑶聲波清灰器是以壓縮空氣為工質篮球即时比分网,在電磁閥的控制下將壓縮空氣的能量由聲波發生器轉變為聲能,以聲波的方式向外傳遞。聲波以直射、滲透、反射和繞射等形式疊加形成強大的諧振聲場作用于受熱面上,破壞灰粒與受熱面的結合力而達到除灰效果。對鍋爐爐壓以及換熱面無影響,運行維護費用低且吹灰無死角(如下圖)。

接觸式吹灰

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