中国电机工程学报
中國電機工程學報
중국전궤공정학보
ZHONGGUO DIANJI GONGCHENG XUEBAO
2013年
26期
41-47
,共7页
李琳娜%任强强%李诗媛%吕清刚
李琳娜%任彊彊%李詩媛%呂清剛
리림나%임강강%리시원%려청강
富磷添加剂%麦秆%燃烧%碱金属
富燐添加劑%麥稈%燃燒%堿金屬
부린첨가제%맥간%연소%감금속
phosphorus-rich additive%wheat straw%combustion%alkali metals
通过研究3种富磷添加剂与麦秆中碱金属的化学反应机制，分析磷对麦秆燃烧过程中碱金属迁移转化行为的影响。富磷添加剂包括：磷酸二氢铵(NH4H2PO4)、磷酸二氢钙(Ca(H2PO4)2·H2O)、磷酸三钙(Ca3(PO4)2)。利用电感耦合等离子体发射光谱(inductively coupled plasma optical emission spectrometer ICP-OES)、X 射线衍射(X-ray powder diffraction，XRD)以及扫描电子显微镜X射线能谱(scanning electron microscopy , energy dispersive X-ray SEM-EDX)等分析检测手段，对燃烧底灰中碱金属(K 和 Na)含量、产物物相、微观形貌及特征区域元素分布进行分析。在800℃进行麦秆与富磷添加剂的混烧实验。研究结果表明，适量富磷添加剂的添加对麦秆中碱金属具有捕集作用，抑制碱金属以气态形式析出，还可以抑制麦秆底灰发生烧结。富磷添加剂与麦秆中碱金属发生化学反应可生成高熔点 K-Ca-P 的化合物。NH4H2PO4和Ca(H2PO4)2·H2O与麦秆中碱金属反应主要生成 CaK2P2O7；Ca3(PO4)2与麦秆中碱金属反应主要生成Ca10K(PO4)7、Ca10Na(PO4)7和 Ca5(PO4)3Cl。碱金属磷酸盐的生成说明了富磷添加剂对麦秆燃烧过程中碱金属捕集作用的机制。
通過研究3種富燐添加劑與麥稈中堿金屬的化學反應機製，分析燐對麥稈燃燒過程中堿金屬遷移轉化行為的影響。富燐添加劑包括：燐痠二氫銨(NH4H2PO4)、燐痠二氫鈣(Ca(H2PO4)2·H2O)、燐痠三鈣(Ca3(PO4)2)。利用電感耦閤等離子體髮射光譜(inductively coupled plasma optical emission spectrometer ICP-OES)、X 射線衍射(X-ray powder diffraction，XRD)以及掃描電子顯微鏡X射線能譜(scanning electron microscopy , energy dispersive X-ray SEM-EDX)等分析檢測手段，對燃燒底灰中堿金屬(K 和 Na)含量、產物物相、微觀形貌及特徵區域元素分佈進行分析。在800℃進行麥稈與富燐添加劑的混燒實驗。研究結果錶明，適量富燐添加劑的添加對麥稈中堿金屬具有捕集作用，抑製堿金屬以氣態形式析齣，還可以抑製麥稈底灰髮生燒結。富燐添加劑與麥稈中堿金屬髮生化學反應可生成高鎔點 K-Ca-P 的化閤物。NH4H2PO4和Ca(H2PO4)2·H2O與麥稈中堿金屬反應主要生成 CaK2P2O7；Ca3(PO4)2與麥稈中堿金屬反應主要生成Ca10K(PO4)7、Ca10Na(PO4)7和 Ca5(PO4)3Cl。堿金屬燐痠鹽的生成說明瞭富燐添加劑對麥稈燃燒過程中堿金屬捕集作用的機製。
통과연구3충부린첨가제여맥간중감금속적화학반응궤제，분석린대맥간연소과정중감금속천이전화행위적영향。부린첨가제포괄：린산이경안(NH4H2PO4)、린산이경개(Ca(H2PO4)2·H2O)、린산삼개(Ca3(PO4)2)。이용전감우합등리자체발사광보(inductively coupled plasma optical emission spectrometer ICP-OES)、X 사선연사(X-ray powder diffraction，XRD)이급소묘전자현미경X사선능보(scanning electron microscopy , energy dispersive X-ray SEM-EDX)등분석검측수단，대연소저회중감금속(K 화 Na)함량、산물물상、미관형모급특정구역원소분포진행분석。재800℃진행맥간여부린첨가제적혼소실험。연구결과표명，괄량부린첨가제적첨가대맥간중감금속구유포집작용，억제감금속이기태형식석출，환가이억제맥간저회발생소결。부린첨가제여맥간중감금속발생화학반응가생성고용점 K-Ca-P 적화합물。NH4H2PO4화Ca(H2PO4)2·H2O여맥간중감금속반응주요생성 CaK2P2O7；Ca3(PO4)2여맥간중감금속반응주요생성Ca10K(PO4)7、Ca10Na(PO4)7화 Ca5(PO4)3Cl。감금속린산염적생성설명료부린첨가제대맥간연소과정중감금속포집작용적궤제。
Chemical reaction mechanisms between alkali metals and three kinds of phosphorous-rich additives were studied to investigate the effect of phosphorus on the behavior of alkali metals during wheat straw combustion. The selected phosphorus-rich additives included ammonium dihydrogen phosphate (NH4H2PO4), monocalcium phosphate (Ca(H2PO4)2·H2O) and calcium phosphate (Ca3(PO4)2). The content of alkali metals (K and Na), the crystalline phases, the morphology and elemental composition in the producted ash were analyzed with inductively coupled plasma optical emission spectrometer (ICP-OES), X-ray powder diffraction (XRD), scanning electron microscopy and energy dispersive X-ray (SEM-EDX), respectively. Experiments of co-combustion of wheat straw with rich-phosphorus additives were conducted at 800oC. Results show that a certain amount of phosphorus-rich additives is positive for capturing alkali metals, restraining the volatilization of alkali metals and inhibiting the sintering of wheat straw ash. The reactions between phosphorus-rich additives and alkali metals in wheat straw lead to the formation of K-Ca-P compounds with higher melting point. The reaction between NH4H2PO4 or Ca(H2PO4)2·H2O and potassium metals in wheat straw forms CaK2P2O7, and the reaction between Ca3(PO4)2 and potassium metals in wheat straw produces Ca10K(PO4)7, Ca10Na(PO4)7 and Ca5(PO4)3Cl. The formation of alkali phosphates explains the capturing mechanism of potassium phosphate during wheat straw combustion.
