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技術文章

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熱風爐技術說明

  熱風爐技術說明

  一、熱風爐結構

  熱風爐主要產生900~1100℃的高溫煙氣的熱工設備。爐內出來的高溫煙氣與主排風機排出的部分廢氣(約90℃)混合成300℃左右的熱風供烘干立磨內的高爐水渣。熱風爐為傳統的面包爐結構,分燃燒室和混合室。熱風爐砌體長11676mm、寬5584、高6465mm;燃燒室爐膛內長7716mm、爐膛內寬4408mm,爐膛高5375mm。爐子的有效容積249m3,其中燃燒室為190m3。

  爐子砌體結構采用復合型節能結構,主要尺寸如下:

  爐墻:232mm高鋁磚+116mm輕質粘土磚+240mm紅磚;

  爐底:136mm高鋁磚+204mm高鋁磚+340mm輕質粘土磚+120mm紅磚;

  爐頂:300mm高鋁磚+20mm普通硅酸鋁纖維毯+200mm高爐水渣。

  熱風爐的熱損失主要是爐體散熱,向外散熱的熱流密度≤3200kJ/m2.h,爐子的表面積約為262 m2,小時散熱量約為0.84GJ,約占供熱總量1.5%。還有部分是扒渣時爐門的輻射熱。正常情況下,熱風爐的熱效率在98%以上。

  二、燒嘴布置和燒嘴技術性能

  熱風爐最大加熱能力為65GJ/h,爐內溫度為900~1100℃。熱風爐全燒混合煤氣時,混合煤氣用量為8625m3/h(混合煤氣熱值為1800×4.18kJ/m3),助燃空氣用量約15200 m3/h,選用6個FMS-17亞高速燒嘴,燒嘴最大煤氣量為1720 m3/h。燒嘴布置在爐子兩側,每側3個。

  全燒煤粉時,設計按煤粉最大消耗量為3000kg/h考慮,選用2個MFP1500可調旋流煤粉燒嘴,單個燒嘴最大燃煤量為1500kg/h,要求煤粉低發熱值>4600kcal/kg。煤粉燒嘴布置在爐頭。

  熱風爐煤粉燒嘴采用MFP-1500型可調旋流煤粉燒嘴,結構上采取二次風強烈旋轉和帶有可調鈍體以調節火焰長度,火焰的鋪展性好,易點火,燃燒穩定。技術性能參數如下:

  1)最大燃煤量:1500kg/h;

  2)煤粉細度R90%:20~30;

  3)調節比:1:2;

  4)一次風壓:≥980Pa;二次風壓:≥1960Pa;

  5)一次風量:2480Nm3/h;二次風量:5780Nm3/h;

  6)一次風溫:0;二次風溫:0~100℃;

  7)火炬射程:3.8~5.5m;

  8)火炬張角:40~60°。

  煤氣燒嘴采用FMS-17亞高速燒嘴,由殼體、空氣旋流器、煤氣管、法蘭等組成。煤氣和空氣在給定的壓力下進入燒嘴,助燃空氣通過空氣旋流器,形成強烈的旋轉氣流并帶動煤氣,使火焰軸向斷面呈雙曲線狀在爐內燃燒。由于空氣和煤氣在燒嘴磚內混合燃燒,所以不會產生回火和脫火現象,燒嘴使用安全可靠。技術性能參數如下:

  1)最大混合煤氣量:1720Nm3/h;

  2)調節比:1:10;

  3)嘴前空氣壓力:2000~4500Pa;

  4)嘴前混合煤氣壓力:2000~3000Pa;

  5)火焰長度:2~3m。

  三、耐火材料有關性能

  高鋁磚:應符合國標GB2988-2004之規定

序號
指標名稱
數值
1
牌號
LZ-55
2
體積密度 g/cm3
2.3
3
常溫耐壓強度 MPa
≥40
4
導熱系數(W/(m.℃)
2.09+1.861×10-3t

 

  粘土磚:應符合國標GB3994-2005一級品之規定

序號
指標名稱
數值
1
牌號
N-1
2
體積密度 g/cm3
≥2.1
3
常溫耐壓強度 MPa
≥30
4
導熱系數(W/(m.℃)
0.84+0.58×10-3t

 

  輕質粘土磚:應符合國標GB3994-2005一級品之規定

序號
指標名稱
數值
1
牌號
NG125-0.8
2
體積密度 g/cm3
800
3
常溫耐壓強度 MPa
≥3.0
4
導熱系數(W/(m.℃)
0.22+0.426×10-3t

 

  普通硅酸鋁纖維毯熱導率小于0.153 W/(m.℃)。

  四、熱風爐控制

  熱風爐由于是制備高溫煙氣的熱工設備,加上還要與爐外冷風摻混成300℃左右的熱風用于烘干高爐水渣。所以為了保證煤粉或混合煤氣的燃燒,空氣過剩系數一般1.1考慮,開始助燃空氣一般按與正常最大燃燒量匹配的量供入爐內,當熱負荷變化時,助燃空氣量不變,相當于空氣過剩系數增加,更有利于燃料的完全燃燒;旌厦簹饬康淖兓ㄟ^調節閥遠程控制(儀控操作室)完成。

  五、風機參數

  1、煤粉燃燒風機及電機等

  一次風機(2臺):(該風機為西安院選擇,僅供參考)

  型號:4-72№4A            或 4-72№3.6A

  全壓:2014Pa                    1531Pa

  風量:4012m3/h                  3045m3/h

  電機及功率:Y132S-2, 5.5kW     Y100L-2, 3kW

  ( 2900r/min)          ( 2900r/min)

  一次風機需依據管道阻力情況定,要求到燒嘴前的一次風壓力≥980Pa。

  二次風機(2臺):

  型號:9-26№5A

  全壓:4825Pa

  風量:7513m3/h

  電機及功率:Y160L-2, 18.5kW ,轉速2900r/min。

  2、混合煤氣燃燒時風機及電機

  風機型號為:9-19№11.2D

  全壓:7236Pa

  風量:15380m3/h

  電機及功率:Y225M-4, 45kW ,轉速1450r/min。

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