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电力节能技术在电力技术中的应用
企业需要加强对电力计量的管理，有两层含义，其一就是避免因为计量问题而给企业经营带来的隐患，对运行的重要电能计量装置施行质量跟踪、状态监测、抽样检定、动态管理，定期进行对在用计量装置测试数据分析，避免计量装置失准运行，提高在用电能计量装置准确性；其二就是根据电能计量的结果制定相关长效机制，减少不必要的电能损耗或者使用，降低企业产品的成本。...
2020-10-26 22:14:25浏览：42
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Study of properties and mechanisms of backing weld of stainless steel piping with no backing gas
This work investigates the proposed welding of stainless steels with no backing gas by using solid wire ER316L-Si and mixed gases (He+Ar+CO_2). The protection mechanism was also discussed from the view of arc physics and the alloy elements in the solid wire. The result shows that when the proportion of helium in the above-noted mixed gases excesses 45 percent, the mechanical properties and the intergranular corrosion tendency meet corresponding Chinese standards. Further, the alloy elements in the solid wire can react with oxygen during the period of high temperature boosted by helium arc; this result in the formation of a bed of thin slag, which can avoid the oxidation of the backing weld and eliminate the need of backing gas....
2020-09-15 12:28:59浏览：107
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Emissions of SO2,NO and N2O in a circulating fluidized bed combustor during co-firing coal and bioma
This paper presents the experimental investigations of the emissions of SO2, NO and N2O in a bench scale circulating fluidized bed combustor for coal combustion and co-firing coal and biomass. The thermal capacity of the combustor is 30 kW. The setup is electrically heated during startup. The influence of the excess air, the degree of the air staging, the biomass share and the feeding position of the fuels on the emissions of SO2, NO and N2O are studied. The results show that an increase in the biomass shares results in an increase of the CO concentration in the flue gas, probably due to the high volatile content of the biomass. In co-firing, the emission of SO2 increased with the increasing biomass share slightly however, non-linear increase relationship between SO2 emission and fuel sulfur content is observed. Air staging decreases the NO emission significantly without raising the SO2 level. Though change the fuel feeding position from riser to downer results in a decrease in the NO emission level, no obvious change is observed for the SO2 level. Taking the coal feeding position R as a reference, the relative NO emission can significantly decrease during co-firing coal and biomass when feeding fuel at position D and keeping the first stage stoichiometry greater than 0.95. The possible mechanisms of the sulfur and nitrogen chemistry at these conditions are discussed and the ways of simultaneous reduction of SO2, NO and N2O are proposed....
2020-06-12 16:19:54浏览：1446
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水蒸气对oxy-coal燃烧中NO生成的影响
为了研究H2O对燃料N向NO转化各个阶段的影响，采用可沿程取样的沉降炉反应器，研究了一种烟煤在1273 K温度下，O2/N2、O2/CO2以及O2/CO2/H2O气氛下燃烧的燃尽与NO生成的情况。并通过在停留时间为0.2、0.3、0.5、1.1 s与O2浓度为5%、21%及30%情况下的实验来研究H2O对NO生成的影响。实验结果表明，相对于O2/CO2气氛，H2O的添加抑制了NO的生成，且该影响主要集中在燃烧初期挥发分N的氧化过程。随着O2浓度的增加，H2O添加对oxy-coal燃烧方式下NO生成影响加大。...
2020-06-12 16:18:56浏览：1420
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Possibility of Reducing Formations of NOx and SO2 Simultaneously during Coal Combustion
Comparing with other NOx and SO2 control technologies, in-bed reducing NOx and SO2 simultaneously during coal combustion may lower the investment and operation cost. However, there are several possible contradictions between the reduction of NOx and the capture of SO2 during combustion: 1) CO rich atmosphere is favorable for the reduction of NOx, whereas O2 rich favorable for the capture of SO2; 2) higher preheating temperature of coal is favorable for reducing NOx, but unfavorable for reducing SO2; 3) sulphation of some minerals may deactivate their catalytic effect on the reduction of NOx. The attempts to eliminate such contradictions by coating coal granules with thin layer of monometallic oxides and mixed oxides were proposed. Ni2O3 and Fe2O3 showed high activity on NOx reduction and CaO and Cr2O3 showed good effect on sulfur capture. The mixed metallic oxides, e.g., Fe2O3NiO, etc., showed effective for both NOx reduction and SO2 retention. It is possible to in-bed reduce NOx and SO2 simultaneously if the adhering materials are properly chosen to be difunctional materials of both active catalysts for NOx reduction reactions and better sorbents for SO2 retention....
2020-06-12 16:18:19浏览：1439
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CuO/γ-Al2O3催化剂选择性催化还原NO
利用溶胶凝胶法制备CuO/γ-Al2O3,催化剂颗粒,在固定床上测试催化脱硝活性.CuO/γ-Al2O3在250～400℃范围内脱硝效率达到90%以上.硫化作用后催化剂的最佳温度窗口向高温方向移动.利用程序升温方法研究了.CuO/γ-Al2O3对NH3的氧化性能,经硫化后催化剂NH3的氧化性能下降,降低了催化剂在低温区脱硝活性.NH3和NO的脱附实验显示NH3和NO在催化剂表面存在明显的吸附现象.经硫化经后催化剂增加了对NH3的吸附量,降低了对NO的吸附量.暂态实验证明NH3以吸附态参与反应,而NO以气态或者弱吸附态参与反应.NO的吸附在实际SCR反应过程中影响有限.动力学计算显示溶胶凝胶法制备CuO/γ-Al2O3拥有较低的选择性催化还原反应活化能....
2020-06-12 16:09:18浏览：1418
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Co/Al2O3催化剂催化还原NO的活性研究
针对汽车尾气中的NO污染物制得Co/Al2O3催化剂,考查了不同因素对Co/Al2O3催化剂还原NO的影响.用不同方法对该催化剂的活性进行了表征,结果显示该催化剂纯度高,其中Co负载量为2%的催化剂催化活性最好....
2020-06-12 16:09:16浏览：1406
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