洗中煤和煤矸石的混合燃烧特性分析

利用热分析法研究了洗中煤和煤矸石混合后的低热值混煤的燃烧特性,对数据进行分析获得了其燃烧特性峰值温度、着火温度、燃尽温度、综合燃烧特性指数等特征参数,通过动力学分析得到了活化能与频率因子等参数,得出结论:混合比对煤样的着火性能有很大影响和低热值混煤的燃烧过程服从1.5级的化学反应。     

混煤特性的综合性试验研究

本文采用规分析方法及热天平，滴管炉，一维燃烧炉对混煤的热解，着火，燃尽特性及污染物形成规律进行了综合性的试验研究，对混煤燃烧的规律进行了探讨，为大型电站锅炉燃烧混煤提供了科学依据。图８表１参４     

混煤燃烧特性的热重试验研究

对不同配比下由烟煤、无烟煤和褐煤掺混得到的混煤的燃烧性能进行了热天平试验研究，对不同配比下混煤的活化能进行了计算，并根据活化能与着火温度随掺混比的变化规律对混煤的着火特性进行了探讨;此外根据不同掺混比下煤样的试验数据，从阿累尼乌斯定律出发，提出了表征煤在着火后燃烧速度和燃烧稳定性指数HF，对不同配比下煤的HF进行了计算，并据此对混煤的稳燃及燃尽性能进行了研究。图11表2参5     

混煤热解特性及燃烧过程的实验研究

针对六枝化处煤和娄底煤焦两种单煤及这两煤种之间9种不同掺混比的混煤的燃烧进行了实验研究。通过热重分析方法，分析单一煤种及不同掺混比的混煤燃烧时燃烧特性和燃尽性能的差异，提出了反映煤燃烧着火及燃尽性能的燃烧特性综合判别指数S′，对两煤种混烧的燃烧特性及其燃尽性能进行初步预测。     

不同类型秸秆生物炭的燃烧特性与动力学分析

研究不同热解温度、粒度、种类的秸秆生物炭的燃烧特性,并进行动力学分析。结果表明,随着热解温度升高,秸秆生物炭的固定碳、C和高位热值均增加,综合燃烧指数减小,燃烧向高温区移动,活化能增大。随着升温速率增高,生物炭综合燃烧指数增大,活化能降低。生物炭着火温度为260～395℃,燃尽温度为480～555℃,500℃制备的生物炭燃烧特性最好,活化能为48～65 kJ/mol。超微生物炭的着火温度、燃尽温度和活化能最低,综合燃烧指数最高,棉花秸秆生物炭更适合作固体燃料。     

高浓度有机废液的燃烧特性和动力学参数研究

研究了高浓度有机废液和混煤废液的燃烧特性和动力学参数,考察其着火特性、燃烧燃尽特性、动力学参数以及燃烧特性对有机废液焚烧炉设计、运行等的影响.研究表明:高浓度有机废液粘度低,具有良好的雾化特性;其热值较低,使得着火温度较高;混煤有机废液较原有机废液易着火,且燃烧稳定、良好,燃尽时间也较短.     

混煤燃烧中的交互作用:掺烧方式和配风对着火和燃尽特性的影响

以某台布置双一次风喷口的试验炉为研究对象,采用数值模拟方法研究了混煤掺烧方式和优化配风对着火和燃尽特性的影响,揭示了氧竞争作用对混煤燃尽抑制的机理,并给出了优化调控方法。结果表明:掺烧方式是影响混煤燃烧着火特性的重要因素;在炉外掺混方式下,掺入高挥发分煤能够改善低挥发分煤的着火特性;掺烧方式对低挥发分煤燃尽特性的影响更显著;炉内掺烧方式可抑制混煤燃烧过程中的氧竞争作用,提高低挥发分煤的燃尽率;合理调整二次风配风量可进一步提高低挥发分煤的燃尽率和混煤的总燃尽率。     

褐煤及其混煤燃烧特性试验研究

将小龙潭煤和先锋煤两种褐煤按不同比例混合进行热重分析研究.分析单一煤种及不同配比混煤的燃烧特性的差异,提出了反映煤燃烧着火及燃尽的燃烧特性综合判断指数.并根据化学动力学方法计算了各过程的化学动力学参数活化能和频率因子.     

680 MW超超临界锅炉混煤燃烧特性的热重试验及锅炉选型建议

采用热重分析仪对西塞山发电有限公司二期工程2×680 MW超超临界锅炉拟燃用混煤的着火稳定性和燃尽性进行了分析,结果表明:设计煤种的着火稳燃性一般,燃尽性较差.同时,根据锅炉混煤的燃烧特性提出了锅炉设备选型的初步建议和运行参数选择建议.综合混煤的燃烧特性和锅炉对煤种的适应性分析,得出锅炉采用切圆燃烧方式是较好的选择.     

混煤热解特性及热解机理的热重法研究

本文介绍了运用热重分析法对不同性能煤种的混煤的热解特性以及热解反应机理研究的成果,通过实验得到了混煤的热解机理方程和热解反应动力学参数,为进一步研究混煤的着火,燃烧特性提供了理论基础。     

煤粉与生物质混燃的低温着火特性

利用自制的管式炉恒温热重测量实验台研究了掺混比、温度、煤种以及生物质种类等因素对煤粉与生物质混燃时低温着火特性的影响,并对煤粉与生物质混燃时的低温着火活化能进行了计算.结果表明:随着掺混比的增大,混合物的燃烧速率加快且燃尽程度提高;温度升高能改善煤粉与生物质混合物的燃烧特性;掺混生物质对难燃煤的着火特性影响比对易燃煤更明显;对于某一煤种,掺混水分和挥发分含量高的生物质,燃烧初期的失重速率加快;掺混灰分含量越多的生物质,在燃烧后期对煤粉的促燃作用越差;燃烧反应活化能随着生物质掺混比和温度区间的增大而减小.     

城市污泥和煤混燃特性的热重分析法研究

利用热重分析法对某城市污泥和某煤种及其两者混合物的着火温度、活化能及综合燃烧特性等参数进行了研究。试验结果表明，混合试样和煤相比其活化性能得到了提高，着火温度提前，综合燃烧性能下降。在混燃过程中，煤和城市污泥基本上保持了各自的挥发分析出特性，煤的燃烧表现得更为明显。     

Experimental investigation on ignition and burnout characteristics of semi-coke and bituminous coal blends

Ignition and burnout characteristics of semi-coke and bituminous coal blends were investigated by thermogravimetric analyzer and drop tube furnace. The results showed that the ignitability index and the comprehensive combustion characteristic index of the blends decrease as the blending proportion of semi-coke increases, but the average activation energy of the blends increases gradually. Ignition mode of bituminous coal is changed from homogeneous to hetero-homogeneous ignition with the increasing of semi-coke content in the blends. When the mixing proportion of semi-coke is lower than 45%, the burnout rate is lower than the weighted value in the early stage of combustion and gradually higher than the weighted value with the development of combustion process. However, the burnout is always lower than the weighted value to mix with 67% semi-coke. Increasing furnace temperature from 850 °C to 1050 °C can improve the mid-term reaction process, alleviate the negative effects of semi-coke on the co-combustion process and increase the burnout rate. So less than 45% semi-coke blending ratio and increasing furnace temperature are recommended for semi-coke and bituminous coal co-combustion.     

Thermogravimetric analysis of the co-combustion of coal and paper mill sludge

The thermal behavior of semi-anthracite coal, paper sludge and their blends during pyrolysis and combustion processes was investigated in this study. The experiments were conducted in a differential thermogravimetric analyzer at different heating rates (10 K/min, 20 K/min and 30 K/min) and at temperatures ranging from 310 K to 1300 K. The results revealed that de-volatilization of paper sludge occurred earlier with a higher rate, and that the process was further accelerated under oxygen-enriched conditions. The blends had integrative thermal profiles that reflected both paper sludge and coal. In addition, the blends showed different ignition and combustion behavior depending on the percentage of sludge. Two types of non-isothermal kinetic analysis methods were applied to evaluate the combustion processes. The kinetic parameters of the blends confirmed the improved ignition characteristics. In addition, both the TG profiles and activation energy indicated that the combustion of their blends with low percentages of sludge, such as 10 wt.%, were similar to that of coal. These experimental results help explain and predict the behavior of coal and paper sludge blends in practical applications.     

煤粉热解特性对其富氧气氛下着火机理的影响

利用非等温热重分析法对两种烟煤的热解特性及富氧下的燃烧特性进行研究.实验结果表明,煤粉中低温下的热解行为对其富氧气氛下的着火机理有明显影响.挥发分初析温度低、热解特性指数D大的煤,随着氧体积分数的增加,着火方式逐渐由非均相转变为均相.而挥发分初析温度高、D较小的煤,着火方式则无明显变化.热解活性高的煤,在着火机理转变后,着火温度显著降低,但燃尽温度基本不受影响.氧体积分数提高后两种煤粉的燃烧特性指数S都有所增大,但相同氧体积分数下不同煤种之间的S相差不多,说明着火机理的改变对S无明显影响.     

Thermal analysis and kinetics of coal during oxy-fuel combustion

The pyrolysis and oxy-fuel combustion characteristics of Polish bituminous coal were studied using non-isothermal thermogravimetric analysis. Pyrolysis tests showed that the mass loss profiles were almost similar up to 870℃ in both N_2 and CO_2 atmospheres, while further mass loss occurred in CO_2 atmosphere at higher temperatures due to char-CO_2 gasification. Replacement of N_2 in the combustion environment by CO_2 delayed the combustion of bituminous coal. At elevated oxygen levels, TG/DTG profiles shifted through lower temperature zone, ignition and burnout temperatures decreased and mass loss rate significantly increased and complete combustion was achieved at lower temperatures and shorter times. Kinetic analysis for the tested coal was performed using Kissinger-Akahira-Sunose(KAS) method. The activation energies of bituminous coal combustion at the similar oxygen content in oxy-fuel with that of air were higher than that in air atmosphere. The results indicated that, with O_2 concentration increasing, the activation energies decreased.     

The effect of wood biomass blending with pulverized coal on combustion characteristics under oxy-fuel condition

In this study, combustion from the co-firing of coal and wood biomass, and thermal characteristics such as ignition temperature, burn-out temperature, and activation energy were discussed using a thermogravimetric analyzer (TGA). We investigated the effects of biomass blending with two kinds of pulverized coal (bituminous Shenhua, and sub-bituminous Adaro) under air and oxy-fuel conditions. The coal fraction in the blended samples was set to 1, 0.8, and 0.5. The oxygen fraction in the oxidant was set to 0.21, 0.3, 0.5, and 0.8. The ignition temperature was governed by the fuel composition, particularly in the blended biomass which has a much higher content of volatile matter comparing to coal. However, the burnout temperature, which shows a strong relationship with char combustion, depended on the oxidant ingredients rather than on the fuel components. Thermal characteristics such as ignition, burnout temperature, reaction region, and heat flow were very similar between air and a 0.3 oxygen concentration under oxy-fuel conditions with Shenhua coal.     

杜仲药渣与煤的混烧特性及灰熔融特性研究

本文采用热重分析仪分析了杜仲药渣和石下江煤的混合样品的燃烧特性,采用灰熔点测试仪、X射线荧光仪、X射线衍射仪及扫描电子显微镜对混合物灰样的灰熔融特性变化进行了分析.结果表明:药渣掺混比为40%时着火温度最低;加入90%药渣时,稳燃性指数、综合燃烧特性指数、最大燃烧速率和平均燃烧速率值均达到最大,燃尽温度最小;在杜仲叶渣和煤的共燃过程中,发生了协同作用,生成了一些新的矿物质,混合灰样的灰熔融温度随着药渣质量分数的增多而减小.     

Characteristics of co-combustion and kinetic study on hydrothermally treated municipal solid waste with different rank coals: A thermogravimetric analysis

This study presents an investigation on the influence of hydrothermally treated municipal solid waste (MSW) on the co-combustion characteristics with different rank coals, i.e. Indian, Indonesian and Australian coals. MSW blends of 10%, 20%, 30% and 50% (wt.%) with different rank coals were tested in a thermogravimetric analyser (TGA) in the temperature range from ambient to 700 °C under the heating rate of 10 °C/min. Combustion characteristics such as volatile release, ignition and burnout were studied for the blend fuel. Different ignition behavior was observed depending on the blends composition and the coal rank. The result of this work indicates that the blending of MSW improves devolatization properties of coal. But it was found that the co-combustion characteristics of MSW and coal blend cannot be predicted only from the pyrolytic and or devolatization phenomena as the other factors such as the coal quality also plays a vital role in deciding the blends co-combustion characteristics. The TGA combustion profiles showed that the combustion characteristics of blends followed those of parent fuels in both an additive and non-additive manners. These experimental results help to understand and predict the behavior of coal and MSW blends in practical applications.     

生物质和煤混合燃烧实验

生物质与煤混合燃烧是一种综合利用生物质能和煤炭资源并同时降低污染排放的新型燃烧方式。本文在STA409C型热综合分析仪上对一种煤样和两种生物质样以及它们不同的比例所得的混俣试样进行燃烧特性分析。结果表明，在煤中加入生物质后，着火燃烧提前，同时可以获得更好的燃尽特性。生物质和煤混合后，发热量增加，提高了生物质的利用价值。