CAJ | 학술논문

研究了21%O2/79%CO2气氛下,磷酸二氢铵对稻秆不同温度下的固钾能力及对灰熔融性的影响。利用电感耦合等离子体发射光谱( ICP-AES)、X射线衍射( XRD)以及扫描电子显微镜( SEM)等检测手段,对稻秆燃烧灰中K元素含量、产物物相以及微观形貌进行分析。固定床燃烧固钾实验表明,添加NH4 H2 PO4能够有效提高稻秆固钾率,900℃下稻秆自身固钾率为14.65%,添加NH4 H2 PO4后固钾率为68.79%,可以有效抑制生物质燃烧过程中碱金属以气态形式析出,并缓解了灰结渣现象。700℃燃烧条件下NH4 H2 PO4和钾反应的主要产物为KPO3；900℃下反应的主要产物为高熔点物质K2 CaP2 O7,从微观形貌可以看出NH4 H2 PO4能够抑制灰颗粒的烧结,添加NH4 H2 PO4能有效提升稻秆灰熔点。
연구료21%O2/79%CO2기분하,린산이경안대도간불동온도하적고갑능력급대회용융성적영향。이용전감우합등리자체발사광보( ICP-AES)、X사선연사( XRD)이급소묘전자현미경( SEM)등검측수단,대도간연소회중K원소함량、산물물상이급미관형모진행분석。고정상연소고갑실험표명,첨가NH4 H2 PO4능구유효제고도간고갑솔,900℃하도간자신고갑솔위14.65%,첨가NH4 H2 PO4후고갑솔위68.79%,가이유효억제생물질연소과정중감금속이기태형식석출,병완해료회결사현상。700℃연소조건하NH4 H2 PO4화갑반응적주요산물위KPO3；900℃하반응적주요산물위고용점물질K2 CaP2 O7,종미관형모가이간출NH4 H2 PO4능구억제회과립적소결,첨가NH4 H2 PO4능유효제승도간회용점。
Particle agglomeration, fouling on the heating surface and other issues are closely related to the alkali metals during biomass thermo-chemical conversion. The potassium fixation ability and ash fusing characteristics in the combustion of rice straw ( RS) added with ammonium dihydrogen phosphate ( NH4 H2 PO4 ) were studied in a 21%O2/79%CO2 atmosphere. The reaction residue from the experiment in a drop tube furnace was analyzed with inductively coupled plasma atomic emission spectrometer ( ICP-AES ) , X-ray diffraction ( XRD ) and scanning electron microscopy ( SEM) . The potassium retention ratio of co-combustion of RS and NH4 H2 PO4 is higher than that of RS alone, especially at 900℃, and the retention ratio increases from 14. 65% to 68. 79%. The reaction between NH4 H2 PO4 and alkali metals in rice straw leads to the formation of KPO3 at 700 ℃ and K2 CaP2 O7 at 900 ℃, which is a high melting point compound. SEM analysis on residue indicates the agglomeration is inhibited, and the ash fusion temperature of RS is increased by adding NH4 H2 PO4 . These results can be helpful to the research and development of high-alkali biomass clean utilization process.