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首页> 外文期刊>Thermal engineering >Experience of Implementation of In-furnace Methods of Decreasing NO_X in E-320-13.8-560GM Boilers: Problems and Ways for Their Solution
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Experience of Implementation of In-furnace Methods of Decreasing NO_X in E-320-13.8-560GM Boilers: Problems and Ways for Their Solution

机译：E-320-13.8-560GM锅炉炉内降低NO_X方法的实施经验：存在的问题和解决方法

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AbstractDuring natural gas combustion, the content of nitrogen oxides in combustion products is approximately 450 mg/m3in many E-320-13.8-560GM boilers in service, which is more than 3.5 times higher than the established maximum NOxconcentrations in flue gases for such boilers. Estimates according to the existing techniques have shown that gas combustion on the basis of in-furnace techniques (the feeding of combustion products to burners together with air in the volume of 15% and two-stage combustion with 20% air feeding through the nozzles upstream of the burners) enables one to decrease NOxemissions to the level of concentrations of less than 100 mg/m3, which is lower than the maximum allowable values. However, the application of any of the proposed measures with respect to a boiler makes its operation under normal load significantly difficult, since the thermal capacity of the superheater is higher in both cases, which leads to an increase in the temperature of superheated steam above the maximum allowable temperature. On the basis of the developed adapted boiler model, which was created using the Boiler Designer software, we performed numerical studies to determine the required boiler reconstruction volume; the implementation of this reconstruction will provide reliable boiler operation at all working loads and ensure the normative values of NOxemissions. According to the results of thermal calculations, it was proposed to reduce the surface of the cold stage of the superheater circuit and increase the size of the economizer. It is noted that the implementation of environmental protection measures usually decreases the boiler efficiency. At the same time, it has been established that the technical and economic performance of the E-320-13.8-560GM boiler does not decrease owing to an increase in the economizer surface and a decrease in air inflows and overflows in regenerative air heaters and remains at the same level if the air inflow volume decreases from the available 30 to 20%. The fundamental solutions that were used for the E-320-13.8-560GM boiler to decrease NOxemissions can also be used for other BKZ gas-and-oil-fired boilers.
机译：摘要 在天然气燃烧过程中，许多在役E-320-13.8-560GM锅炉中燃烧产物中氮氧化物的含量约为450 mg / m 3 ，该值比此类锅炉的烟气中最高NO x 浓度高出3.5倍以上。根据现有技术进行的估算表明，在炉内技术的基础上进行气体燃烧（燃烧产物与15％的空气一起送入燃烧器，二级燃烧与20％的空气通过上游喷嘴供入）的燃烧器）可以将NO x 排放降低到浓度低于100 mg / m 3 ，该值低于最大允许值。但是，针对锅炉的任何建议措施的应用都使得锅炉在正常负载下的运行变得非常困难，因为两种情况下过热器的热容量都较高，这导致过热蒸汽的温度升高到高于最高允许温度。在使用Boiler Designer软件创建的已开发的适应锅炉模型的基础上，我们进行了数值研究，以确定所需的锅炉改造量。该改造的实施将在所有工作负荷下提供可靠的锅炉运行，并确保NO x 排放的标准值。根据热计算的结果，提出了减少过热器回路的冷段表面并增加省煤器的尺寸。需要注意的是，环保措施的实施通常会降低锅炉的效率。同时，已经确定，E-320-13.8-560GM锅炉的技术和经济性能不会由于节约器表面的增加以及蓄热式空气加热器中残留的空气流入和溢流的减少而降低。如果进风量从可用的30％减少到20％，则保持在相同的水平。用于E-320-13.8-560GM锅炉以减少NO x 排放物的基本解决方案也可用于其他BKZ燃气和燃油锅炉。

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