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首页> 外文期刊>Fuel >The surface combustor-heater with cyclic flow reversal combustion embedded with water tube bank
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The surface combustor-heater with cyclic flow reversal combustion embedded with water tube bank

机译：带有水管束的循环逆流燃烧的表面燃烧器-加热器

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Based on the new concept of cyclic flow reversal combustion (CFRC) of a combustible mixture in a packed bed of porous inert medium, a new surface combustor-heater (SCH) embedded with a heat exchanger was explored. Thermal structure, heat transfer performance and emission characteristics were examined. Effects of operating parameters such as water flow rate, half-period, equivalence ratio, heat input and particle size of the packed bed were clarified. The heat transfer performance and the emission characteristics were evaluated by comparing them with those of conventional one-way flow combustion (OWFC). Results show that operation of the SCH with CFRC was possible despite multiple heat sinks and a strong quenching effect. Favorable flame stabilization, extended flammability and a more uniform temperature profile over the tube bank were established. Preferable heat transfer enhancement and combustion augmentation were obtained with high thermal efficiency (up to 80 percent) and significantly lower CO and NO_x emissions (as low as 40 ppm at 0 percent excess O_2) as compared with conventional OWFC. CFRC can provide flexibility in heat transfer performance and emission characteristics by adjusting the half-period. The thermal efficiency and emission characteristics of CFRC were insignificantly affected by the equivalence ratio. CFRC was suitable for operating at relatively low heat input because of high thermal efficiency and low CO and NO_x emissions. A large particle size (d_p=16mm) of the packed bed significantly improves the thermal efficiency with favorably low emission (as low as 30 ppm). This SCH with CFRC concept can provide the basis for development of state-of-the-art technology for new versions and more advanced thermal systems, such as highly efficient ultra-low-pollutant-emission boilers, for efficient utilization of energy.
机译：基于多孔惰性介质填充床中可燃混合物的循环逆流燃烧（CFRC）的新概念，研究了一种新型的嵌有热交换器的表面燃烧器-加热器（SCH）。检查了热结构，传热性能和排放特性。阐明了诸如水流速，半周期，当量比，热输入和填充床粒度等操作参数的影响。通过将其与常规单向流燃烧（OWFC）的传热性能和排放特性进行比较来评估它们。结果表明，尽管有多个散热器和强大的淬火效果，也可以在CFRC的情况下运行SCH。建立了良好的火焰稳定性，延长的可燃性和在管束上更均匀的温度曲线。与传统的OWFC相比，具有较高的热效率（高达80％）并显着降低了CO和NO_x排放（在O_2过量0％时低至40 ppm），从而获得了理想的传热增强和燃烧增强效果。 CFRC可以通过调节半周期来提供传热性能和排放特性的灵活性。当量比对CFRC的热效率和排放特性影响不大。 CFRC因具有较高的热效率以及较低的CO和NO_x排放量而适合在相对较低的热量输入下运行。填充床的大粒径（d_p = 16mm）可显着提高热效率，并且排放量低（低至30 ppm）。这种具有CFRC概念的SCH可以为开发新版本和更先进的热力系统（例如高效的超低污染物排放锅炉）的最新技术提供基础，以高效利用能源。

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