摘 要

包頭第二熱電廠2×200MW機組脫硫系統(tǒng)是NID半干法脫硫技術(shù)首次在200MW機組上應(yīng)用。脫硫系統(tǒng)投運后暴露出的循環(huán)灰給料機、石灰變頻電機、混合器頻繁故障等問題影響到該系統(tǒng)的穩(wěn)定可靠運行。脫硫系統(tǒng)投運后對電除塵器效率有一定影響，煙塵排放濃度不能達標(biāo)。脫硫灰通過除塵器捕集后進入水力除灰管道系統(tǒng)，對管道結(jié)垢存在影響。在參考國內(nèi)外大量煙氣污染控制文獻的基礎(chǔ)上，本文結(jié)合華能包頭第二熱電廠實際情況，對包頭第二熱電廠的NID半干法脫硫系統(tǒng)存在問題的原因進行了分析和研究，并對其經(jīng)濟性進行初步分析，為該脫硫系統(tǒng)的穩(wěn)定、經(jīng)濟、可靠運行提供理論依據(jù)和技術(shù)支持。

關(guān)鍵詞：NID半干法脫硫技術(shù)，穩(wěn)定可靠運行，解決方案，經(jīng)濟性

The 2×200 MW unit desulphurization system in BaoTou Second Heat and Power Plant is the first application of NID semi-dry desulfurization technology on 200 MW unit.Some problems,such as the frequently fault of circulating ash feeder,lime inverter-fed motors and mixer etc.which are discovered after desulphurization system operation,affect the steady and reliable operation of this system.Desulphurization system has certain influence for the efficiency of ESP after its operation and the fume emission density can not be passed. Desulphurization ash enters hydraulic ash disposal pipeline system through ESP catching, which has some influence for pipeline scaling.On the foundation of refering to plenty of domestic and international flue gas pollutive controlling documents,this paper,combining with the actual condition of Huaneng BaoTou Second Heat and Power Plant,has analysed and studied the problems'reasons of NID semi-dry desulfurization system in BaoTou Second Heat and Power Plant,and carries out preliminary analysis for its economy which can offer theoretical basis and tech support for the steady,economic,reliable operation of this desulphurization system.

Li Huifen(Environmental engineering)

Directed by prof.Yin Lianqing

目錄

第一章 緒論………………………………………………………………………………1

1.1酸雨的來源和危害……………………………………………………………1

1.2火力發(fā)電行業(yè)二氧化硫排放及脫硫機組發(fā)展趨勢…………………………2

1.3本課題的研究意義和目的……………………………………………………3

1.4本論文所做工作………………………………………………………………4

第二章 煙氣污染控制的方案選擇………………………………………………………5

2.1國內(nèi)外煙氣脫硫技術(shù)的研究和應(yīng)用概況……………………………………5

2.2濕法煙氣脫硫技術(shù)……………………………………………………………6

2.3干法、半干法煙氣脫硫技術(shù)…………………………………………………8

第三章 包頭二電廠200MW機組NID脫硫系統(tǒng)基本設(shè)計條件…………………………11

3.1電廠概況……………………………………………………………………11

3.2工程相關(guān)參數(shù)………………………………………………………………11

第四章 包頭二電廠200MW機組NID脫硫系統(tǒng)…………………………………………19

4.1采用的標(biāo)準(zhǔn)和規(guī)范……………………………………………………………19

4.2脫硫工藝選擇…………………………………………………………………20

4.3反應(yīng)原理………………………………………………………………………21

4.4 NID脫硫工藝的流程…………………………………………………………22

4.5 NID脫硫系統(tǒng)主要組成和功能………………………………………………24

4.6 NID脫硫系統(tǒng)工藝控制………………………………………………………31

第五章 包頭二電廠200MW機組脫硫系統(tǒng)運行與維護…………………………………33

5.1 NID脫硫系統(tǒng)運行要求………………………………………………………33

5.2現(xiàn)場巡回檢查內(nèi)容……………………………………………………………33

5.3檢修和維護……………………………………………………………………34

第六章 包頭二電廠200MW機組脫硫系統(tǒng)存在問題及技術(shù)措施…………………………35

6.1主要故障及解決措施…………………………………………………………35

6.2脫硫系統(tǒng)性能考核試驗結(jié)果…………………………………………………36

6.3脫硫系統(tǒng)投運以來的突出問題及研究解決…………………………………39

6.4對其他兩個采用相似脫硫工藝電廠調(diào)研情況………………………………41

第七章 包頭二電廠200MW機組脫硫系統(tǒng)脫硫效率影響因素……………………………44

第八章 包頭二電廠200MW機組脫硫系統(tǒng)經(jīng)濟性研………………………………………47

8.1環(huán)境保護項目的經(jīng)濟性特……………………………………………………47

8.2包頭二電廠200MW機組脫硫系統(tǒng)的經(jīng)濟性分析……………………………48

第九章結(jié)論……………………………………………………………………………………50

參考文獻………………………………………………………………………………………51

致謝……………………………………………………………………………………………53