共查询到20条相似文献,搜索用时 189 毫秒
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通过分析煤炭燃烧可能产生各项污染物量的受影响因素,总结了煤炭燃烧产生各项污染物的经验计算公式,并提出了不同燃烧方式、不同煤质及不同脱硫除尘设施影响污染物排放量的各项经验系数,并以大同地区煤炭煤质资料为基础,计算出了1t煤炭燃烧后各项污染物的排放量,为污染物治理提供依据. 相似文献
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提出一种基于火焰辐射光谱特性对大气式和红外式灶具进行区别的实验测试方法。采用红外傅里叶光谱仪搭建了实验测试系统,对3个型号灶具的辐射光谱进行了测试与分析。获得了3个型号灶具在2. 5~15μm波段的光谱特性,研究了不同测试模式、供气压力对测试光谱的影响。大气式与红外式灶具的红外辐射光谱仅在2. 5~10μm波段有明显的差异,只有竖直测试模式能够有效区分两种灶具的辐射光谱。大气式和红外式灶具的辐射光谱在2. 6~3. 1μm和4. 1~4. 7μm两个波段存在较强的辐射峰。大气式灶的辐射光谱除上述辐射峰之外,在其他波段的辐射较弱,在这两个波段发射的能量超过了总辐射能的80%。红外式灶除了高温气体的辐射外,还叠加了被气体加热的固体连续型再发射。随着供气压力的增加,大气式灶火焰光谱辐射峰的位置没有改变,辐射峰的光谱辐射力增大。红外式灶除了燃烧气体的辐射峰光谱辐射力增大外,在3~10μm波段的连续型辐射也明显增大。准确区分大气式和红外式灶具,或是两种灶具的混合改良形式,应通过灶具的外形结构、燃烧组织形式、红外波段的光谱特性进行综合判断。 相似文献
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酒店旧厨房空调换气系统的设计方法存在问题,而导致换气次数高、热能消耗过大。根据不同换气次数条件下污染物浓度分布特点和酒店厨房自身的运作特点,对送风方式、送风位置和排风系统配置做了改进。以组合风幕送风方式将室外新风直接送到炉灶周围和厨师呼吸区污染物浓度超标部位,高效率地满足煤气燃烧需氧量要求、快速稀释超标部位污染物浓度;利用风幕的空气动力控制污染物溢出,减少残留率;采用主、副送排风系统,在煤气用量高峰段和非高峰段分开使用。改进后测试结果表明:换气次数30次/h时厨师呼吸区CO、CO2浓度不超标,残留率减少16%,炉子燃烧状况良好,系统节能显著,运行效果稳定。 相似文献
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针对气源变化影响全预混冷凝式燃气壁挂炉的燃烧工况,探讨了2种燃气自适应控制方案——离子电流检测法、氧或二氧化碳含量检测法。 相似文献
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The Stirling engine is an environmentally friendly external combustion heat engine and reduces the complexities of the combustion process, and indirectly helps in reduction of CO2 emission. Modelling based on cyclic analysis is performed for a Beta configuration Stirling engine of 1.5?kWe capacity using a rhombic drive for the solar-dish-supported Stirling engine. The analysis helps in estimating the overall efficiency of the system using the experimental correlation of the solar concentrator ARUN160 at the engine operating temperature. The analysis shows that the system will have overall efficiency around 25% in the range of 750–1050?K at the expansion space. The degradation of performance compared to that at an operating temperature of 1025?K is only marginal and makes 750?K a more preferred temperature. The present study evaluates a range of possible design goals and provides suitable alternatives and thus provides a clear understanding of the system design considerations. 相似文献
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将分形理论应用于有限容积预混合燃烧阶段 ,通过计算火焰速度和分数维数等参数 ,并与准维燃烧模型相结合 ,得到了有限容积的燃烧放热率 ,探索了将分形理论应用于有限容积燃烧的研究。 相似文献
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The effect of dimethyl carbonate (DMC) on the gaseous and particulate emissions of a diesel engine was investigated using Euro V diesel fuel blended with different proportions of DMC. Combustion analysis shows that, with the blended fuel, the ignition delay and the heat release rate in the premixed combustion phase increase, while the total combustion duration and the fuel consumed in the diffusion combustion phase decrease. Compared with diesel fuel, with an increase of DMC in the blended fuel, the brake thermal efficiency is slightly improved but the brake specific fuel consumption increases. On the emission side, CO increases significantly at low engine load but decreases at high engine load while HC decreases slightly. NOx reduces slightly but the reduction is not statistically significant, while NO2 increases slightly. Particulate mass and number concentrations decrease upon using the blended fuel while the geometric mean diameter of the particles shifts towards smaller size. Overall speaking, diesel-DMC blends lead to significant improvement in particulate emissions while the impact on CO, HC and NOx emissions is small. 相似文献