CAJ | 학술논문

对一台100,MW四角切圆燃煤锅炉燃烧煤粉和掺烧污泥时，进行炉内流动、燃烧和污染物排放等研究，并开展了现场掺烧试验。在污泥含水率为56%、掺烧配比(质量分数)小于10%的情况下，模拟结果与现场试验数据相一致，炉膛整体温度水平较燃烧单煤有所降低，总燃尽率降低，飞灰含碳量增加，NOx排放上升，但差别均较小，煤泥掺烧对锅炉的正常运行影响较小，表明实际掺烧较低配比污泥是可行的。进一步研究不同含水率和高配比污泥掺烧对锅炉燃烧特性和污染物排放特性的影响。研究表明，在相同掺烧配比情况下，降低污泥含水率，NOx排放有所增加，但总体上有利于改善锅炉燃烧特性；增加污泥掺烧配比至小于20%时，锅炉燃烧特性与污染物 NOx排放特性与单煤燃烧差异较小；当污泥掺烧配比大于20%时，污泥的燃烧特性显著影响整体燃料特性，锅炉燃烧效果变差，NOx排放大幅度上升，表明在实际锅炉掺烧大配比(超过20%)污泥的过程中，可能需要采取措施，控制锅炉燃烧效果与污染物的排放。增加燃尽风比例或减少二次风量均能有效降低 NOx的排放。实际掺烧过程中，应密切观察炉膛及受热面结渣和积灰情况。
대일태100,MW사각절원연매과로연소매분화참소오니시，진행로내류동、연소화오염물배방등연구，병개전료현장참소시험。재오니함수솔위56%、참소배비(질량분수)소우10%적정황하，모의결과여현장시험수거상일치，로당정체온도수평교연소단매유소강저，총연진솔강저，비회함탄량증가，NOx배방상승，단차별균교소，매니참소대과로적정상운행영향교소，표명실제참소교저배비오니시가행적。진일보연구불동함수솔화고배비오니참소대과로연소특성화오염물배방특성적영향。연구표명，재상동참소배비정황하，강저오니함수솔，NOx배방유소증가，단총체상유리우개선과로연소특성；증가오니참소배비지소우20%시，과로연소특성여오염물 NOx배방특성여단매연소차이교소；당오니참소배비대우20%시，오니적연소특성현저영향정체연료특성，과로연소효과변차，NOx배방대폭도상승，표명재실제과로참소대배비(초과20%)오니적과정중，가능수요채취조시，공제과로연소효과여오염물적배방。증가연진풍비례혹감소이차풍량균능유효강저 NOx적배방。실제참소과정중，응밀절관찰로당급수열면결사화적회정황。
Field test and numerical simulation were carried out to evaluate the characteristics of co-combustion coal and sludge in a 100,MW tangentially fired utility boiler,and the characteristics of flow,combustion and NOx emis-sions were studied. The simulation results were consistent with the experimental data when the sludge moisture con-tent was 56% and the blending mass fraction of sluage was less than 10%.The furnace temperature of co-combustion was lower than that of coal combustion,the total burnout rate fell,and the fly ash carbon content and NOx emissions increased,but the differences were small,which indicate that co-combustion with low mass fraction of sludge had little effect on the boiler. Further researches were conducted to study the influence of moisture content and high blend-ing mass fraction of sludge on combustion characteristics and NOx emissions. Results show that the decrease of sludge moisture content with the same blending mass fraction was helpful to improve the boiler combustion characteristics, although NOx emissions increased a little;Increasing the blending mass fraction of sludge but keeping it lower than 20% had little influence on combustion characteristics and NOx emissions of the boiler;but when the blending mass fraction of sludge was greater than 20%,sludge combustion characteristics significantly influenced mixed-fuel prop-erties,the firing effect of the boiler went worse,and NOx emissions increased by a large scale,which indicatethat when the boiler combined firing with high blending mass fraction of sludge(over 20%),some measures shouldbe taken to control the firing effect and NOx emissions. Increasing over fire air ratio or decreasing the total second air could reduce NOx emissions. More attention should be paid to slag-bonding in the furnace in practice.