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    煤粉鍋爐等離子體點火技術
    低NOx優化燃燒技術
    煤粉鍋爐微油點火技術
    typical case
    典型案例

    華電江蘇望亭電廠低氮改造項目

    2018-11-29文章來源:原創文章

    1、 工程概況

      望亭發電廠11號鍋爐為上海鍋爐廠引進美國燃燒工程公司技術進行設計制造的亞臨一次再熱控制循環鍋爐。采用單爐膛,四角切向燃燒方式,露天布置。爐膛寬度為14022mm,深度為11760mm,爐頂管中心線標高為66900mm,鍋爐爐頂采用全密封結構。鍋爐采用敷管式輕型爐墻,除容克式預熱器單獨支承外,鍋爐受熱面均采用懸吊結構,全部重量懸吊在鋼架頂部的梁上。西安熱工研究院2011年低NOx調整試驗結果,300MW負荷工況空預器出口處NOx濃度300~400mg/m3.

    2、設計煤質特性

     

    成份

    符號

    單位

    設計煤種

    校核煤種Ⅰ

    校核煤種Ⅱ

    Car

    %

    53.16

    50.2

    48.98

    Har

    %

    3.10

    2.95

    2.99

    Oar

    %

    3.5

    3.95

    4.5

    Nar

    %

    0.9

    0.85

    0.85

    Sar

    %

    0.8

    0.9

    1.65

    灰分

    Aar

    %

    28.54

    32.65

    31.26

    全水分

    Mar

    %

    8

    8

    9.8

    干燥無灰基揮發份

    Vdaf

    %

    18.8

    20

    27.03

    低位發熱量

    Qnet,ar

    kJ/kg

    20496

    19558

    19490

    可磨系數

    HGI

    /

    56

    61

    60

    灰的變形溫度

    DT(t1)

    1300

    1250

    1200

    灰的軟化溫度

    ST(t2)

    1380

    1350

    1250

    灰的熔化溫度

    FT(t3)

    1480

    1400

    1300

    3、鍋爐主要設計參數

     

    名 稱

    單位

    定壓

    B-MCR

    額定負荷

    高加全切

    工況

    70%

    BMCR

    1

    過熱蒸汽量

    t/h

    1025

    907.0

    787.5

    717.5

    2

    過熱蒸汽出口壓力

    MPa

    18.3

    17.3

    17.1

    17.0

    3

    過熱蒸汽出口溫度

    541

    541

    541

    541

    4

    再熱蒸汽流量

    t/h

    834.8

    745.4

    765.1

    598.0

    5

    再熱蒸汽進口壓力

    MPa

    3.83

    3.41

    3.55

    2.72

    6

    再熱蒸汽出口壓力

    MPa

    3.63

    3.23

    3.36

    2.58

    7

    再熱蒸汽出口溫度

    541

    541

    539.9

    541

    8

    預熱器一次風進口溫度

    27.8

    27.8

    27.8

    27.8

    9

    預熱器一次風出口溫度

    319.4

    315.0

    276.1

    300.9

    10

    預熱器二次風進口溫度

    22.8

    22.8

    22.8

    33.9

    11

    預熱器二次風出口溫度

    330.0

    323.3

    285

    312.0

    12

    爐膛過量空氣系數

    1.25

    1.25

    1.23

    1.33

    13

    預熱器進口煙溫

    368

    350

    319

    346

    14

    鍋爐排煙溫度(未修正)

    138.9

    135.6

    118.9

    131.7

    15

    鍋爐排煙溫度(修正后)

    130.6

    126.7

    111.7

    122.8

    16

    鍋爐效率(高溫熱值)

    %

    87.58

    87.73

    88.50

    87.96

    17

    鍋爐效率(低位熱值)

    %

    91.5

    91.6

    92.4

    91.9

    18

    鍋爐燃煤量

    t/h

    139.9

    126.6

    130.8

    103.9

    19

    燃燒器投運層數

    2-5

    2-5

    2-5

    2-4

    20

    燃燒器噴嘴擺角度

    0

    0

    -30.0

    -30.0

    4、項目運行情況

      望亭項目以前由行業內西安熱工研究院進行了改造,效果不好,我們在其改造的基礎上,進行了重新設計,通過我們改造后業主方請西安熱工研究院出具了專業測試報告,飛灰含碳量降為1.33%(改造前大于2%),NOX排放為261.0mg/Nm3(改造前為500-600mg/Nm3),鍋爐熱效率為94.18%,鍋爐效率有所提高。

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