燃机进气冷却技术探讨

燃机进气冷却技术是一种提高燃机发电机组在高温环境下出力的关键技术,研究、实践燃机进气冷却技术具有重要意义.探讨了大气温度影响燃机出力、效率的机理,介绍了燃机进气冷却应用的发展过程,并分析对比了燃机进气冷却的主要方式及主要优缺点,可对燃机进气冷却技术的工程应用提供参考.     

模锻钛合金叶片锻件的新工艺

此文介绍了飞行器上燃气涡轮发动机用的各种类型钛合金叶片锻件的模锻新工艺,以及在卧锻机上镦粗长矩形斜头叶片的模具结构和采用保护—润滑材料的效果。     

3号喷气燃料加速老化实验中性能指标变化趋势研究

目的研究作为导弹用涡轮发动机贮存寿命薄弱环节之一的油封燃料的贮存稳定性。方法借鉴国外燃料加速老化试验方法,开展不同状态燃料的加速老化实验。结果掌握了3号喷气燃料加速老化实验中性能指标变化趋势,评价了不同状态的3号喷气燃料的贮存稳定性。结论脱水脱氧喷气燃料的贮存稳定性优于普通喷气燃料,贮存16年后变质仍程度较低。     

我国东南沿海海上风电塔架防护涂装体系设计与评价思考

针对我国东南沿海湿热、亚湿热地区海上风电塔架服役环境的特殊性,对开展针对性的涂装防护体系设计和实验室性能评价方法提出了一些改进设想。设计防护体系时,应充分考虑风电塔架各腐蚀区域的主要环境影响因素,选择合适的涂料体系并适当增加涂层厚度;采用单因素环境试验对涂层的性能进行实验室评估时,应适当增加每一种试验项目的时间,并结合服役环境增加测试项目。     

三缸三排汽200 MW汽轮机低压转子光轴供热改造的节能减排效益研究

该文结合当前的国家政策和电力行业深度挖潜、灵活性改造的发展需求,针对当前某电厂所在区域的供热现状进行了简要说明,对该电厂三缸三排汽200 MW汽轮机低压缸光轴改造原理进行了说明;结合改造经验,对机组经济性指标、节能量情况进行了测算,对项目的供热收益和灵活性收益进行了总结,对项目的环保效益进行了计算,说明光轴供热改造项目不仅具有良好的经济效益,还具有节能和环保的社会效益,更会对企业的可持续发展产生积极影响和促进作用.     

对转压气机三维掠动叶优化设计

为探索三维掠动叶降低对转压气机二次流损失的潜力,进一步提高对转压气机气动性能,基于近似函数与遗传算法,针对某对转压气机双排转子在整机环境下进行三维掠动叶优化设计,并对优化前后流场进行对比分析。优化成功的得到了双排“S”形掠动叶,结果表明:三维掠动叶有效改善了双排动叶吸力面径向二次流,减小了吸力面低速区,提高了对转压气机性能,优化工况点整机效率提高0.6%,全工况范围内效率均有所提高；三维掠动叶提高对转压气机效率的根本原因是其对径向负荷分配的重新调整,将叶展下方流动较差区域负荷移至叶展上方,改善流场的同时保证对转压气机负荷不变。      

Optimal post-warranty maintenance contracts for wind turbines considering availability

ABSTRACT

Outsourcing maintenance is an economical way for wind farm owners to address sophisticated and expensive maintenance operations of wind turbines. This paper proposes three options for the post-warranty maintenance contract of wind turbines from the perspective of service providers. Option 1 involves corrective maintenance only. In option 2, the first preventive maintenance is performed at a certain time point and after that periodic maintenance is carried out. Option 3 initiates with a preventive replacement and performs periodic maintenance subsequently. An availability target is set over the contract period and failing to satisfy the target incurs a penalty from the service provider. The objective is to determine the optimal preventive maintenance programs of option 2 and option 3 that minimize the contract servicing cost. Numerical examples are provided to illustrate the proposed policies. The results show that option 2 and option 3 are more effective than option 1 and their effectiveness grows when warranty and contract coverages increase.     

风电机组噪声预测

在已有后缘为钝形双叶片风电机组噪声预测模型基础上,结合我国风力发电机组叶片形状及其辐射噪声的频谱特性等,对预测模型进行了修正.通过对3台不同型号风电机组13个测点噪声测量值和预测值对比验证表明,修正后模型能较好地反映风电机组噪声的衰减规律.在预测点与风轮中心距离大于1.5倍风轮直径时,修正后模型预测值与实测值差值在±2.5dB(A)范围内.利用修正后预测模型计算确定的风电机组噪声声功率级及指向性指数,将其代入考虑指向性的点声源模型,可用于简化预测与风轮中心距离大于3倍风轮直径处的噪声.     

风机基础环松动原因分析和注浆加固

风机基础环是连接塔筒和混凝土基础的关键部件。结合我国东部某风电场出现的基础环故障,从设计、施工及运行等方面,对风机基础环松动的原因进行了调查分析,认为基础环下法兰处混凝土存在损伤破坏。采取注浆方法对基础进行加固,详细阐述了水钻孔排查、灌浆材料选择、清孔、注浆等关键工序。可供风机基础设计、施工及处理同类事故参考。     

Multi-criteria PSO-based optimal design of grid-connected hybrid renewable energy systems

ABSTRACT

Human-induced climate change through the over liberation of greenhouse gases, resulting in devastating consequences to the environment, is a concern of considerable global significance which has fuelled the diversification to alternative renewable energy sources. The unpredictable nature of renewable resources is an impediment to developing renewable projects. More reliable, effective, and economically feasible renewable energy systems can be established by consolidating various renewable energy sources such as wind and solar into a hybrid system using batteries or back-up units like conventional energy generators or grids. The precise design of these systems is a critical step toward their effective deployment. An optimal sizing strategy was developed based on a heuristic particle swarm optimization (PSO) technique to determine the optimum number and configuration of PV panels, wind turbines, and battery units by minimizing the total system life-cycle cost while maximizing the reliability of the hybrid renewable energy system (HRES) in matching the electricity supply and demand. In addition, by constraining the amount of conventional electricity purchased from the grid, environmental concerns were also considered in the presented method. Various systems with different reliabilities and potential of reducing consumer’s CO₂ emissions were designed and the behavior of the proposed method was comprehensively investigated. An HRES may reduce the annualized cost of energy and carbon footprint significantly.