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      循環流化床CFB-SNCR脫硝技術(300t/h以下)


核心技術 Core technology

循環流化床CFB-SNCR脫硝技術

1、技術簡介

循環流化床鍋爐(CFB)具有燃燒溫度較低、溫度場均勻性好、氮氧化物初始排放濃度較低等特點,同時,也具有磨損大、粉塵含鈣量高等不利使用SCR的因素,非常適用于采用SNCR脫硝工藝。但常規的SNCR脫硝設備投資相對于300t/h以下規模的鍋爐來說造價較高、安裝工作量大、占地較多。我公司針對300t/h以下的循環流化床鍋爐(CFB)開發的SNCR脫硝裝置可采用一體化精巧設計并便于安裝,可采用尿素或氨水作為還原劑,脫硝效率可達到50%~70%,是一種經濟性高、NOx脫除效率好的高性價比方案。

2、CFB-SNCR脫硝工藝特點:

不采用催化劑,以鍋爐爐膛作為反應器,在溫度850~1250℃溫度窗口完成反應,不需要另外的反應器。

每臺機組設置一套SNCR控制系統,可并入主機DCS系統,SNCR控制系統獨立運行,采用自動跟蹤鍋爐負荷、溫度調節控制和噴槍運行邏輯來滿足SNCR系統需要。根據鍋爐出口兩側煙氣量、NOx濃度不同,分配調整兩側噴氨量,控制總脫硝效率。

CFB-SNCR脫硝特點:

通過CFB/CFK計算,優化噴槍設計,可準確確定還原劑的噴射量,達到較理想的脫硝效率和較低的運行費用。

對SNCR脫硝系統采取特殊設計,避免噴槍磨損及受熱腐蝕。

設備采用模塊化設計,減少檢修、維護工作量。

3、典型案例

山西京玉發電責任有限公司(2×300MW)循環流化床機組SNCR脫硝項目情況

山西京玉發電責任有限公司(2×300MW)循環流化床機組EPC脫硝改造工程采用選擇性非催化還原法(SNCR)脫硝工藝,還原劑是稀釋為10%的尿素水溶液,洛卡環保提供關鍵設備的設計及供貨。

該工藝技術成熟、占地面積小、一次性投資和運行成本低、不使用催化劑、建設周期短等特點。

尿素溶解、儲存及輸送系統系服務于電廠2臺機組的公用系統。并采用模塊化設計,減少檢修。

爐膛出口煙氣NOx濃度為420mg/Nm3時,投入SNCR系統后,鍋爐出口煙氣NOx濃度能夠控制在200mg/Nm3以下,氨逃逸量≤8ppm,NSR= 1.3,脫硝率可達到60%以上。在鍋爐的任何正常負荷范圍內,確保氮氧化物排放數據符合國家標準。

SNCR脫硝系統應能適應鍋爐30% BMCR工況和100% BMCR工況之間的任何負荷,并能適應機組的負荷變化和機組啟停次數的要求。

此項目的成功運行是洛卡公司SNCR脫硝技術應用與發展的新起點。

 

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