反应炉富氧燃烧特性研究

针对常规燃烧和富氧燃烧两种工况,对反应炉辐射室中的燃烧过程进行了数值模拟,富氧燃烧时空气中氧气摩尔分数为0.34%。模拟结果与实际测量浓度相近,验证了计算模型的有效性。研究结果表明:富氧燃烧能满足管内化学反应对温度控制的要求,与理论混合比燃烧相比,采用富氧燃烧节约燃料12.66%,NOX排放量有所增加。在维持温度场均匀的前提下,提出了燃烧器优化配置方案。     

煤富氧燃烧对节能与环境的影响分析

分析了煤富氧燃烧的节能效果及对环境的影响,煤富氧燃烧可显著减少助燃空气量、烟气生成量,显著节约能源,且有利于减少和控制SO2、CO2的排放,但会明显增加NOx的排放。     

浮法玻璃熔窑富氧燃烧节能技术

综述了富氧燃烧的机理特点,富氧燃烧的优点,富氧燃烧的节能原理;介绍了富氧的来源,富氧燃烧浮法玻璃工业生产工艺的影响。     

浮法玻璃富氧燃烧节能技术的研究

综述富氧燃烧的机理特点,以及富氧燃烧的优点,论述富氧燃烧的节能原理,介绍富氧的来源,以及富氧燃烧浮法玻璃工业生产工艺的影响,并对其应用前景进行展望.     

电站锅炉富氧燃烧的节能效益研究

本文对富氧燃烧的节能机理及其带来的社会效益进行了较为详尽的阐述,并以河南某135MW机组为例计算分析得出富氧燃烧可产生的经济效益,得出结论电站锅炉富氧燃烧完全是可行的,而且可带来可观的经济效益和社会效益.     

膜法富氧试验及富氧燃烧

介绍膜法富氧的原理和作者进行的富氧试验,阐明富氧燃烧的意义及工程应用的特点。     

膜式富氧燃烧系统与节能

空气中含有20.9%的氧和79.1%的氮(体积比)以及少量其它气体。所谓富氧空气是指含氧量大于20.9%的空气。用含氧较多的空气维持燃烧过程就称为富氧燃烧。一、富氧燃烧的节能效果富氧燃烧能够节能的原因是:(一)减少排烟所损失的热量。只有氧才能维持燃烧,空气中所含79%的氮是不能助燃的,当这些氮被鼓入燃烧设备,加热到很高的温度以后排出,带走了大量的热。以冲天炉为例,当炭完全燃烧时,热平衡方程式为:燃科燃烧热=铁水带出热+(排烟损失+炉体散热损失+溶渣损失)。     

低氧燃烧与富氧燃烧的性能比较分析

阐述了低氧燃烧和富氧燃烧的基本概念，并且和传统的燃烧方式作了对比，概括了两种燃烧方式的优缺点。分析了两种燃烧方式的实现途径。应根据不同的实际情况选择不同的燃烧方式。     

富氧燃烧技术用于链条燃煤蒸汽锅炉的合理性和可行性

在分析了富氧燃烧技术特点的基础上,根据某单位5台链条蒸汽锅炉的实际运行情况,从提高炉膛温度、锅炉出力、锅炉热效率及减少污染物排放的实际需要和比较成熟的富氧燃烧技术两方面,论述了富氧燃烧技术用于20t／h链条蒸汽锅炉改造的合理性和可行性。     

Unburnt carbon and ashing behavior for slow burning of lignite under oxygen-enriched combustion conditions

Oxygen-enriched combustion of coal has so far been investigated using either entrained flow reactors or fluidized-bed combustors where burning takes place rapidly due to high heating rates. On the contrary, this paper presents the results of slow burning of coal under oxygen-enriched combustion conditions. Ashing behavior of mineral matter-rich low-rank coal from Turkish Tekirdag-Malkara lignite under oxygen-enriched conditions was investigated to determine the effect of this combustion technique on unburnt carbon, mineralogical characteristics and the burning performance. These experiments showed that the influence of O₂ concentration on ashing is much more evident than the temperature during oxygen-enriched combustion.     

富氧燃烧烟气加压脱硝的实验与模拟研究

为了解决富氧燃烧烟气中NOx对CO2资源化利用的影响问题,实验研究了加压条件下鼓泡与液膜反应器中液体对NOx的吸收作用。建立了高压下NOx吸收的传质及动力学耦合模型,利用该模型对鼓泡吸收和液膜吸收进行了模拟,获得了不同压力下气液相产物的浓度,并与实验结果进行了对比。结果表明:气液相产物的实验结果与模拟结果吻合,且模型的氮元素守恒率高于90%;最佳吸收压力为1.5 MPa;吸附在反应器壁面的液膜对于NOx有较强的吸收作用,液膜的成分主要是HNO3。     

The study of optimal parameters of oxygen-enriched combustion in fluidized bed with optimal torrefied woody waste

The study explored the oxygen-enriched combustion behavior of torrefied waste wood pellets in a fluidized bed. For biomass torrefaction, three indexes, namely energy yield index (EY), proximate analysis-based index (PA), and effective comprehensive combustion index (S_mix), are used to present the optimal conditions from each viewpoint. Four operating parameters, incorporating torrefaction temperature, residence time and nitrogen flow rate, were taken into consideration in this study. The signal-to-noise ratios of each parameter were evaluated to examine the influencing impact of different factors. The optimal results were employed in the investigation of biochar combustion using a laboratory-scale fluidized-bed reactor with oxygen lancing. Oxygen was injected into different zones of the fluidized bed to investigate its influence on combustion efficiency. The parameters of biochar combustion optimization include torrefied materials, fluidized-bed temperature, oxygen inlet position, and oxygen concentration. The total fluidized-bed efficiency and the volatile combustion ratio were evaluated.     

废碱焚烧装置燃烧器自控系统节能效果探讨

针对废碱焚烧装置的炉膛结构特点及燃烧状况,设计了一套燃烧器自动控制系统;对燃烧器进行合理的分组控制,分析了控制原理,编制了控制电路图及程序流程图等,并对其能达到的节能效果进行了分析。     

NO emission of co-combustion coal and biomass blends in an oxygen-enriched atmosphere

A fixed-bed combustion system was used to study the NO emission characteristics of co-combustion of biomass and coal in an O₂/CO₂ atmosphere. With the concentration of oxygen varied in 21%, 30%, and 40% while the biomass blended proportion mounts raised from zero to 10% then to 30%, the generated NO was classified to V_daf-NO and FC_ad-NO, respectively, and the emission rate and conversion ratio of NO were analyzed. The results showed that the NO emission rate and concentration increased with increase in oxygen concentration, but the conversion ratio decreased. Meanwhile, the blended biomass reduced the NO emission concentration and conversion ratio.     

O_2/CO_2气氛下生物质半焦加压燃烧特性的实验研究

利用Thermax500加压热重分析仪（PTGA）,研究了压力对木屑半焦富氧燃烧反应特性的影响。结果表明,压力从0 MPa升高到1.0 MPa,半焦燃烧反应向低温方向移动,反应速率加快,促进了燃烧反应的进行。压力由1.0 MPa继续升高,其对燃烧的促进作用减弱。当压力由1.3 MPa升高到1.6 MPa时,半焦燃烧反应反而向高温方向移动,同时反应速率减慢,过高的压力对燃烧反应起抑制作用。     

不同富氧含量玻璃熔窑火焰空间温度场的对比

建立了玻璃熔窑火焰空间温度场的三维数学模型，通过对某日产400t燃油浮法玻璃熔窑火焰空间在三种富氧情况(氧含量分别是24％，27％，30％)下用图像模拟直观的表述出计算结果。模型包括气相流动与传热模型，雾化油滴燃烧的轨道模型，和辐射传热模型。程序采用MS-FORTRAN语言，绘图采用Stanfordgraphic软件。对比结果表明，随着富氧含量的增加，各小炉火焰长度明显缩短，温度显著提升，模拟结果对窑炉设计与富氧燃烧组织有一定的参考价值。     

Combustion characteristics of Turkish lignites at oxygen-enriched and oxy-fuel combustion conditions

Combustion and oxy-fuel combustion characteristics of two Turkish lignites (Orhaneli and Soma) were investigated by Thermogravimetric Analysis (TGA) method. Experiments were carried out under oxygen-enriched air and oxy-fuel combustion conditions with 21, 30, 40% oxygen concentrations. Three heating rates of 5, 10, and 20 °C/min were considered and the isoconversional kinetic methods of FWO, KAS, and Friedman were employed to estimate activation energies. The uncertainty assessment in obtaining the activation energy values was also considered. The obtained results indicated that the combustion of volatiles at both air and oxy-fuel conditions were approximately identical. However, at air combustion conditions, the decomposition of CaCO₃ took place at temperatures above 700 °C. This decomposition process was independent of the oxygen concentration and took place when the temperature reached to a certain threshold. The decomposition of CaCO₃ did not accomplish in oxy-fuel conditions as far as the temperature was higher than 900 °C. Combustion in oxy-fuel conditions had higher activation energy values comparing to conventional combustion atmosphere. The activation energy values were approximately unchanged at the start of combustion regardless of oxygen concentration or combustion atmosphere at about 165 kJ/mol and 150 kJ/mol for Orhaneli and Soma lignites, respectively. The apparent activation energies were higher at elevated oxygen concentrations. The uncertainties values related to FWO method were lower than KAS and Friedman methods. The calculated average uncertainty values were found to be at the range of 5–15% for most of the cases.