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    等離子體發生器
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    生物質綜合處置方案
    危險廢物等離子體氣化&熔融技術
    污泥干化處理技術
    鍋爐煙垢化學清洗
    高鹽廢水煙道噴霧蒸發結晶零排放技術
    受熱面管道化學鍍膜
    煤制合成氣/工業燃氣
    product presentation
    產品介紹

    污泥干化處理技術

    2017-11-06文章來源:原創文章

    1.工藝流程

    ? ? 利用天然氣作為干化熱源,在無氧或缺氧狀態下,濕污泥在高溫的干化爐中被充分加熱,水分及有機揮發分以干餾氣體形式析出。其中干餾氣體中的可燃氣體,送入干化爐中燃燒,減少天然氣的輸入,從而達到節能的目的。全干化的污泥含水率在5%以下,無臭、熱值高,綜合利用價值高。


    2.全干污泥的特點及用途

    ?(1)化學性穩定:能夠長期保存,使用安全

    (2)無臭:環境友好

    (3)吸著力:脫臭材料,脫色劑

    (4)多孔質:土壤改良材料(通氣性、保水性)

    (5)下水用途的再利用:可以作為脫水助劑使用

    (6)P,Ca,Mg,K成分:可以作為肥料使用

    (7)黑色:可以作為融雪劑使用

    (8)熱量:可以作為燃料使用

    ?

    3.污泥全干化技術的優勢

    (1) 減量化明顯,適用性更強(特別適用中國污泥熱值低、無機物含量高的特點);

    (2) 可連續處理污泥,污泥處理量更穩定;

    (3) 有效利用干餾熱解氣體熱量,減少熱量輸入,更節能;

    (4) 裝置布置緊湊,占地小,更節省土地資源;

    (5) 全干污泥基本無水、熱值高,作為燃料對燃煤鍋爐的影響更低;

    (6) 污泥產生的臭氣就地進行了高溫處理,全干化污泥無臭味,更清潔、更環保;

    (7) 污泥全干技術不受外部熱源、場地、濕污泥運輸、干化污泥運輸等因素限制,應用場景更廣;

    ?

    間接干化耦合發電技術

    1.工藝流程?

    一般采用電廠蒸汽作為傳熱介質,如輔助蒸汽;

    蒸汽不直接與污泥接觸,通過空心槳葉或圓盤干燥機間接換熱干化;

    污泥干燥出來的水進行冷凝回收處理,實現污水零排放。

    項目

    空心槳葉干燥機

    圓盤干燥機

    干燥方式

    間接干化

    間接干化

    干燥介質

    蒸汽/導熱油/高溫水

    蒸汽/導熱油/高溫水

    內部污泥自潔方式

    槳葉嚙合互清

    刮泥刀

    轉軸數量

    2/4

    1

    粘性污泥適應性

    非高粘性污泥

    高粘性污泥

    耐磨性

    空心槳葉受磨損

    圓盤不受磨損

    單臺換熱面積

    ~300m2

    ~420m2

    運行電耗

    相對較大

    相對較低

    設備造價

    基本相同

    基本相同

    2.環保措施

    (1) 污水處理

    ??? 污泥干化的凝結水及地面、設備、車輛的沖洗水送入污水處理廠(混凝+MBR),處理后的中水可回用濕法脫硫用水等,從而實現污水零排放。

    (2) 廢氣處理

    ??? 污泥儲存倉及冷凝器后的不凝廢氣經風機送入爐膛焚燒,并預留污泥脫臭裝置,當鍋爐側出現問題時,廢氣切換至污泥脫臭裝置處理,達標后排放。

    (3) 防臭措施

    濕污泥料倉為密閉的地下料倉,倉體上方配設密封門用于防止異味逸出,并采用微負壓設計,負壓抽風后收集后,匯同不凝廢氣送入爐膛焚燒,并配設脫臭裝置用于緊急情況的脫臭。

    3.性能參數

    項目

    單位

    數值

    干化污泥含水率

    %

    ≤40

    干化介質

    /

    輔助蒸汽(一般)

    干化汽耗

    t/t

    0.80~0.85

    干化電耗

    kW.h/t

    45~50

    占地面積

    m2

    350(100t/h)

    干化機內含氧量

    %

    <3(安全線12%以下)

    出口干化污泥溫度

    ~90

    ?

    直接干化耦合發電技術

    1.工藝流程

    ?

    一般采用電廠鍋爐尾部高溫煙氣作為傳熱介質,如空預器前煙氣;

    高溫煙氣在旋翼式強制流態化干燥機內直接與污泥接觸換熱;

    污泥干燥出來的水分及過程中產生的廢氣隨煙氣進入鍋爐尾部煙氣凈化系統或爐膛進行處理。

    ?

    2.性能參數

    項目

    單位

    數值

    干化污泥含水率

    %

    ≤40

    干化介質

    /

    高溫煙氣(350℃)

    干化煙耗

    t/t

    8.5~9.0

    干化電耗

    kW.h/t

    50~60

    占地面積

    m2

    250(100t/d)

    干化機內含氧量

    %

    <8(安全線是12%以下)

    出口干化污泥溫度

    ~55

    ?

    支持政策

    ? ? 2016年11月7日,國家發改委下發《電力發展“十三五”規劃》要求“鼓勵多元化能源利用,因地制宜試點示范。開展燃煤和生物質耦合發電、燃煤與光熱耦合發電示范及應用……在京津冀、長三角、珠三角布局一批燃煤與污泥耦合發電示范項目”。

    ? ? 2016年12月20日,國務院下發《國務院關于印發“十三五”節能減排綜合工作方案的通知》(國發[2016]74號)要求“加強城市廢棄物規范有序處理。推動餐廚廢棄物、建筑垃圾、園林廢棄物、城市污泥和廢舊紡織品等城市典型廢棄物集中處理和資源化利用,推進燃煤耦合污泥等城市廢棄物發電”。

    ? ? 2018年6月21日,國家能源局、生態環境部下發《關于燃煤耦合生物質發電技改試點項目建設的通知》(國能發電力〔2018〕53號)批示了84個燃煤耦合生物質發電技改試點項目,要求“加強污泥、垃圾填埋監管,積極引導填埋污泥、垃圾無害化處理和利用”。

    ?

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