某电厂300MW机组锅炉引风机改造选型的经济性和安全性分析

介绍某电厂300MW机组为满足环保排放标准开展的引风机和增压风机改造。通过对性能参数的技术经济性比较,以及对机组运行的安全性影响分析,推荐采用增压风机与引风机合并,并选用动叶可调轴流式风机的选型方案,既能达到简化系统,方便运行与维护,降低总体风机耗电率的目的,又兼顾了取消脱硫旁路烟道后机组运行的可靠性,以及对锅炉炉膛和烟道防爆的安全性要求。     

320MW火电机组引增合并改造

神皖安庆电厂2×320MW机组引风机增压风机合并改造方案,针对引风机选型、合并改造后的影响进行了论述,分析了合并后对锅炉的影响及所采取的措施,充分保证机组的安全性.结果证明300MW机组引风机增压风机合并改造并取消脱硫旁路是安全可行的.     

1 000 MW燃煤机组引风机与增压风机改造研究

  [目的]  为确保锅炉烟气系统的正常运行,国内燃煤发电机组实施超低排放改造后,引风机及增压风机需要进行改造。  [方法]  以某1 000 MW燃煤机组为例从技术角度对引风机及增压风机三种可行的改造方案(只改引风机、只改增压风机以及增引合并)进行了比较,并结合工程实际情况进行了经济计算。  [结果]  得出增引合并方案的综合技术经济性最优。  [结论]  此比选方法和改造方案对其他燃煤机组引风机改造有较高的参考价值。     

1000MW机组引增合一改造的应用和分析

铜山华润电力有限公司2×1 000 MW超超临界机组锅炉引风机和脱硫增压风机串联布置,运行电耗偏高,为简化系统,配合后续节能技术改造并节约用电,拟进行引风机与增压风机的合并改造。对改造方案的确定及改造效果进行了论述和分析,改造后机组满负荷运行可使厂用电率下降0.32%,节电效果显著。     

600MW机组脱硝工程引风机与增压风机合并改造研究

乌沙山发电公司600MW超临界机组锅炉风烟系统配置2台引风机和1台脱硫增压风机,为满足今后脱硝改造及除尘器改造的要求,同时降低现风机运行电耗,拟对引风机及脱硫增压风机进行合并。通过对引风机及脱硫增压风机的热态性能试验,确定合并后引风机的改造方案。该方案实施后,机组运行节能效果显著。     

湿法烟气脱硫系统中增压风机节能分析

以某电厂600 Mw亚临界机组石灰石-石膏湿法烟气脱硫系统中的增压风机为研究对象,根据其运行现状,分析节电潜力,从风机可靠性及经济性角度提出最佳的优化改造方案-变极降速消裕,该优化方案较目前运行方式理论上每年多节电约105万kWh,这意味着每年可节省电费36.75万元,大大提升了机组的经济性.本研究为增压风机的实际运行改造奠定理论基础,具有较大工程实用价值.     

汽动引风机控制方案设计

为了进一步降低厂用电率,提高火电机组的经济性指标,部分新建机组除将引风机与脱硫增压风机合二为一之外,另一种节能技术,汽动引风机替代电动引风机也被广泛应用。因此,炉膛压力控制从过去的单静叶控制过渡到静叶+转速控制方式。分析了部分现有的控制策略,提出了全程自动的设计,以及在RB、引风机并列过程中的一些新思想,并经某1 000 MW机组应用,取得了良好的应用效果。     

300MW燃煤发电机组引风机抢风、失速的技术改造

300MW燃煤发电机组2台引风机运行时经常出现失速现象。失速诊断热态试验发现,该风机设计参数与锅炉实际运行所需的参数有很大的偏差,主要因为引风机选型过大,从而风量、风压裕量过大,与该锅炉烟风系统不匹配,当2台引风机调平运行在240～270MW负荷区间时,风机的工作点已非常接近或位于失速区,从而出现失速现象。为此提出改造建议和方案:降低转速,改造电动机绕组,改变风机叶轮直径。     

增压风机运行方式优化及经济性分析

通过试验确认低负荷时引风机出口烟气能克服脱硫系统的沿程阻力,当锅炉总风量低于1 700t/h以下时,脱硫系统停运增压风机,保持动叶全开,引风机适当增加出力,可满足锅炉和脱硫系统安全稳定运行,显著降低了厂用电耗.取得了良好的经济效果.为防止其对锅炉运行产牛影响,在设计控制逻辑时采取了相应的预防措施.,对炉瞠负压波动大、引风机失速、烟气泄漏等方面的问题进行了分析,提出了解决问题的可行性方案,能够保证锅炉的稳定运行.     

引风机和增压风机运行优化分析

以某厂300MW燃煤机组的脱硫系统为研究对象,基于轴流式风机的运行特性,建立运行特性和电耗模型,运用MATLAB软件编写计算程序,计算负荷为50%工况下,随着增压风机入口静压设定值的改变,在风机的四种投运组合方式下的风机效率、总电功率和单机电功率。结果表明:在负荷为50%的工况下运行时,增压风机的入口静压设定值应小于210 Pa,且设定值越小经济性越好;采用两台引风机并联运行效果最好,一台引风机和一台增压风机串联运行效果次之。     

太阳能屋顶风扇

“屋顶风扇”是一种太阳能驱动的屋顶风扇，它无需电力，并将制冷费用降低多达５０％。它一年到头运转，促进空气循环，改善舒适程度，并节约能源。 “屋顶风扇”装在屋顶，可以在３０分钟以内达到全力运行。它具有２６行屋顶金属防雨板和支架，一只１１瓦太阳能组件，一只 １２英寸（３０ｃｍ）的铝扇，一只耐紫外线的防风雨日晒的顶罩和一只低压直流电机，提供无声的运行。 “屋顶风　”不需消耗常规能源就可运转，不需要接电源线，在运转中也不产生废物或污染。当早晨或傍晚太阳低的时候，风扇电机转动较慢。当一天当中最热的时候，也就…     

Active control of fan noise

In the wake-rotor interaction fan noise, a number of the interacting modes at the blade passing frequency （BPF） and its harmonics are generated which are prescribed by the number of stator and rotor blades etc. In the present study, the dominant mode is tried to be suppressed by the secondary sound from the loudspeaker actuators. One of the novel features of the present system is the adoption of the control board with the Field Programmable Gate Array （FP（3A） hardware and the LabVIEW software to synchronize the circumferentially installed loudspeaker actuators with the relative location of rotational blades under arbitrary fan rotational speeds. The experiments were conducted under the conditions of three rotational speeds of 2004, 3150, and 4002 [rpm]. The reduction in the sound pressure level （SPL） was observed for all three rotational speeds. The sound pressure level at the BPF was reduced approximately 13 [dB] for 2004 [rpm] case, but not so large reduction was attained for other cases probably due to the inefficiency of the loudspeaker actuators at high frequencies     

Numerical and experimental investigations on effect of fan height on the performance of piezoelectric fan in microelectronic cooling

A piezoelectric fan is an attractive device to remove heat from microelectronic systems due to its low power consumption, minimal noise and compactness. In the present study, a piezoelectric fan is investigated to analyze the cooling capability for possible use in electronic devices. Both numerical and experimental analyses are carried out on the piezoelectric fan which was oriented horizontally. The FLUENT 6.3 software is used in the 2D simulation to predict the heat transfer coefficient and the flow fields using a dynamic mesh option to observe the fan swinging phenomena. Two heat sources in in-line arrangement are used in the experiment. The flow measurements are carried out at different piezoelectric fan heights by using a particle image velocimetry (PIV) system. The result shows that the piezofan height of h_p/l_p = 0.23 can reduce the temperature of the heat source surface as much as 68.9 °C. The numerical and experimental values of heat transfer coefficients are plotted and found in good agreement.     

小型风机的特点及其在制冷空调设备中应用的注意事项

小型风机虽然效率较低,但在制冷空调设备等小型家用电器中应用却很广泛。通过论述造成小型风机效率低的原因,指出了小型风机在制冷空调设备中应用的注意事项以及提高其运行性能的措施,并强调应力加强小型风机技术的研究。     

Performances and acoustic noise of micro multi-blade fan

In this paper, the performances and the acoustic noise of the traditional type micro multi-blade fan were investi- gated experimentally and numerically, to optimize the specifications of the fan for the resident circumstances. The acoustic noise level decreases but the efficiency deteriorates slightly with the increase of the blade number of the impeller. Besides, the acoustic noise decreases with the increase of the distance between the impeller outlet and the volute tongue, in accompanying with the increase of the input and the deterioration of the fan efficiency.     

Investigation of a miniature centrifugal fan

A centrifugal fan was designed with a matching centrifugal volute flow channel in order to investigate a numerical simulation with prototype manufacturing, and to compare with experimental results. The fan configuration was developed according to a fan-design theorem. A model P-60 turbojet engine compressor blade design was adopted for the fan aerodynamic analysis and design. The results were verified using the STAR-CD code. Also, based on the findings, a miniature centrifugal fan was designed and manufactured using a CNC five axes machine. The P–Q performance curves were tested using an AMCA standard 210-85 test chamber apparatus. From the numerical analysis results, the pressure on the suction and pressure surfaces will increase gradually from the inlet to one-half the distance of the hub’s camber line, however, it will increase more rapidly afterwards. In addition, stress-concentration phenomenon occurred at the tip of the suction and pressure surfaces. In other words, the tip was more prone to damage when the fan was operated. Experiments show that the designed fan maximum flow rate Q and static pressure P were 32% and 59%, respectively, which were lower than the commercial fan data at 2000 rpm rotational speed. However, when the rotational speed was increased to 4000 rpm, the maximum flow rate Q and static pressure P were increased to 38% and 82%. This study concluded that a centrifugal fan’s static pressure at high rotational speed is higher than that of an axial-flow fan. Therefore, a centrifugal fan should be chosen if high static pressure cooling or blowing is required. This advanced research investigation is to build up the capabilities of design, analysis, manufacturing, and measurement of a centrifugal fan with an outer diameter smaller than 10 cm.     

风扇磨煤机检修方式分析

风扇磨煤机是火力发电厂燃用褐煤锅炉机组直吹式制粉系统的主体设备,也适用于化工、造纸厂的动力锅炉制粉需要.它是一种完成煤的磨碎、干燥和输送等三大功能合一的高效率制粉设备.风扇磨煤机主要是由带有护板的机壳和在机壳中高速旋转的打击轮组成.打击轮的检修、拆卸由专门的装置即风扇磨煤机检修车独立完成,打击轮可以方便地拆卸和检修.分析了配备风扇磨煤机直吹式制粉系统的大型火力发电厂中磨煤机检修方式及磨煤机检修中的注意事项.     

Development of a novel mop fan

A novel fan that operates as an air moving device as well as a filter has been investigated. The unit utilizes a brush disk, instead of bladed impellers, within a centrifugal fan casing and is known as a ‘mop fan’. The performance of the mop impellers as fans was tested and their characteristic curves were found to be similar to those of centrifugal fans. The characteristics of the mop fan in terms of airflow rate, pressure, and efficiency were tested using a standard method, BS 848. The tests allowed mops of different fibre number and fibre diameter to be constructed and so optimize mop fan performance. Copyright © 2001 John Wiley & Sons, Ltd.     

影响锅炉引风机运转失衡的分析与调整

本文通过对锅炉引风机运行失衡产生的引风机振动及噪音污染进行改进,证明将锅炉原有引风机改造后,引风机运行平稳,并使噪音降低明显.     

一种实用的风机和水泵节能控制

本文主要以风机和水泵为例,论述小型电站锅炉辅机的变速传动与节能,及其传动系统组成原则和实施方案。并指出本方案可以直接用于传动系统的改造和设计。