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高爐除濕項目介紹
作者:admini 文章來源:本站原創 點擊數:2781 更新時間:2011-6-10 15:21:07 【字體:

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內容提要:

一、前言

    高爐鼓風除濕技術在日本冶金行業是一項很成熟的技術,它既能夠減少高爐的能量消耗,又有利于高爐生產的穩定,提高產品的質量。

二、高爐鼓風除濕節能原理

    在高爐冶煉中需要不斷地將空氣加熱鼓進高爐中。在加熱的空氣中會帶有一定量的水分,這些水分與焦碳的反應過程

                   H2O + C = CO + H2

     這一過程是吸熱反應,將消耗一定的焦碳,在1200 ℃時,1Kg水消耗1.1~1.2Kg的焦碳,因此減少鼓進高爐中空氣的水分就可以減少焦碳的消耗。

三、高爐鼓風除濕對煉鐵高爐帶來的好處

1、降低焦比。在煉鐵高爐鼓風中,空氣每減少1g/m3的水分,可降低焦比0.8-1.0kg/t。

2、多噴煤。在煉鐵高爐鼓風中,濕度每減少1g/m3的水,可提高風口理論燃燒溫度5-6℃,這樣可以多噴1.5-2.0kg/t的煤粉。

3、提高產品質量。南方地區的高爐普遍存在冬季焦比低而產量較高、夏季焦比高而產量較低的現象。這就是空氣中的含濕量變化在起作用。另外在每一天當中空氣中的含濕量也會有很大的變化,這些都會使高爐生產不穩定,影響產品的質量。利用高爐鼓風除濕技術使高爐鼓風達到穩濕、降濕的雙重效果,讓您的高爐生產“四季如冬”,使高爐運行穩定,產品質量提高。

4、風機吸入空氣的溫度降低,使空氣密度增加,同時空氣含濕量減少,空氣中氧氣的份額有所增加。因此使鼓風的質量流量可增加5~15%;或者保持鼓風的質量流量不變,則可使鼓風機的軸功率減少5~15% 。

 

四、高爐鼓風除濕系統工作原理

    目前除濕方法主要有兩種:即吸附法和冷凍法。吸附法是以低溫介質作吸附劑,讓吸附劑與濕空氣充分接觸,以吸收空氣中的水分,隨后對吸附劑加熱脫水再生,并如此循環使用。冷凍法是將濕空氣通過冷凍機冷卻,使其溫度降低到空氣壓力及所含濕量而相對應的飽和溫度以下,即將濕空氣中的水份凝結而析出。選用哪種除濕方式要根據除濕后水分的要求來決定。主要方式有以下三種:

1、冷卻除濕方式

    根據高爐及其鼓風狀況和氣候條件,采用以下脫濕技術工藝,即將進入鼓風機之前的濕空氣通過表冷器冷卻,使其溫度降低到空氣壓力及其含濕量相對應的飽和溫度以下,濕空氣中的水分凝結而析出,使其含水量降低,然后再送入熱風爐。

2、干式吸附除濕 +冷卻除濕方式

    將進入鼓風機之前的濕空氣通過表冷器冷卻,使其溫度降低到空氣壓力及其含濕量相對應的飽和溫度以下,使濕空氣中的水分凝結而析出,再將空氣吹過干式吸附轉輪,吸附水分,使空氣中的水分進一步減少。

3、 濕式除濕方式

    使進入鼓風機之前的濕空氣與氯化鋰水溶液接觸,通過氯化鋰的吸附作用吸附空氣中的水分,減少空氣中的含濕量。

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