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为了提高电炉变压器的实用功率,我厂电炉变压器采用水冷却器降低电炉变压器的温度,但水冷却器存在一个问题,一但冷却器的水进入变压器就有损坏变压器的可能,造成停产,为了防止这种事故发生,我们制造了晶体管电炉变压器水冷却器检漏仪。晶体管电炉变压器水冷却器检漏仪,是由二组晶体管检查电路和一组晶体管时间电路组成,晶体管检测电路是一个低速开关电路,当检测点(1、2)、(3、4)两组检测点开路时,基极处于零偏置,晶体管(BG_1、BG_2)、(BG_3、BG_4)截止,这时集电极只有微小的i穿透电流,所以继电器不动作,当(1、2)、(3、4)两组接点中有水 相似文献
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在使用废气再循环技术时,通过排气再循环(exhaust gas recirculation,EGR)冷却器来控制引入废气的温度,提高充气效率。为解决冷却器的结构设计不合理导致废气换热效果降低的问题;利用计算流体力学(CFD)软件对冷却器进行固液气三相的耦合计算,对冷却器的废气流场和温度场进行分析,结果表明由于入口结构问题导致某些部位冷却效果较差,对冷却器结构进行调整后,冷却效果变好。 相似文献
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摘要: 鉴于黄河多泥沙的特点,小浪底电站技术供水系统在设计上采用了蜗壳水、清水2种水源。清水系统存在回水泵房安全性低、回水泵抽水能力不足、水源供水能力不足的问题。随着小浪底水库的逐渐淤积,技术供水各部冷却器均有不同程度的泥沙淤积,通过采用混合供水、降低流量等措施保证了当前水沙条件下各冷却器不淤积。 相似文献
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关于引进循环流化床锅炉运行中的主要问题及改进措施 总被引:1,自引:0,他引:1
介绍了我国引进循环流化床锅炉运行中产生的主要问题及改进措施。另外,作者对引进循环流化床锅炉共同存在的床渣冷却器的选型和漏灰问题提出了看法,供锅炉用户参考。 相似文献
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CO_2跨临界水水热泵气体冷却器研究 总被引:1,自引:0,他引:1
为提高CO2跨临界循环水-水热泵的效率,对气体冷却器进行了研究.对原有管壳式气体冷却器建立了模型并计算了该气体冷却器沿管长的温度分布.对该气体冷却器进行了实验研究,并改变结构参数以提高气体冷却器的换热效率.计算结果显示CO2侧的换热系数沿管路存在峰值,但要低于水侧的换热系数,主要原因是流量小.增加换热管长,并减小管数,有利于管内换热系数的提高,而且压力降在可接受的范围.通过实验与计算值的对比,CO2出口温度计算偏差小于9%,水温出口温度计算偏差小于5.3%. 相似文献
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山西省侯马市晋田热电有限责任公司现有2台哈尔滨锅炉厂有限责任公司利用Alstom技术生产的220 t/h循环流化床(CFB)锅炉,该锅炉的底渣排放系统采用风水联合冷渣器与L阀相结合的排渣方式.详细地介绍了风水联合冷渣器与L阀的结构和工作原理,以及这套排渣系统在实际运行中发生的问题,还有经过多次改造前后的使用情况,通过分析、研究和结合自己多年的运行经验,现就这套排渣系统在使用过程中存在的问题进行深入分析,并详细地阐述了具体的改进方法 相似文献
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针对嘉兴发电厂汽轮机冷油器存在的切换困难和回水室管板漏油的问题,分析了产生问题的原因,提出并实施了若干技术措施,例如改进冷油器换向阀的切换手柄和阀杆连接销、加装冷油器放气隔离阀和采用异型的密封圈来密封冷油器回水室管板等,成功解决了冷油器运行中的切换困难和回水室管板漏油的问题,满足了汽轮机冷油器长期安全运行的要求. 相似文献
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Thermoelectric devices are solid‐state devices. Semiconductor thermoelectric cooling, based on the Peltier effect, has interesting capabilities compared to conventional cooling systems. In this work second law analysis of thermoelectric coolers has been done with the help of exergy destruction. In the first part, performance of single‐stage thermoelectric coolers and multi stage thermoelectric coolers has been compared for same number of thermoelectric elements i.e. 50. The performance parameters considered to compare their performance are rate of refrigeration, coefficient of performance, second law efficiency and exergy destruction. In second part, multi stage thermoelectric coolers have been analyzed for three different combinations of number of elements in two stages of thermoelectric coolers. The result of the analysis shows that the performance of a multi stage thermoelectric cooler which has total 50 elements gives best performance when it has 30 elements in hotter side and 20 elements in colder side out of the three cases considered. The comparison of single‐stage thermoelectric cooler and multistage thermoelectric cooler shows that for same number of elements rate of refrigeration (ROR) of single‐stage thermoelectric cooler is much higher than that of multi stage thermoelectric cooler. The COP remains same for both of them but the peak value of cop is obtained at much lower value of current supplied in multi stage thermoelectric cooler. Exergy destruction has constant values in single stage as well as multi stage thermoelectric cooler when the two stages have equal number of elements but it decreases with increase in x. The result of comparison of multistage thermoelectric cooler for three values of x i.e. 0.5, 1, 1.5 shows that the COP, ROR and second law efficiency improve and exergy destruction degrades with increase in x and the best performance has been obtained for x = 1.5 out of the three values considered. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
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Arif Emre Özgür 《国际能源研究杂志》2008,32(14):1309-1315
A theoretical analysis of a two‐stage transcritical CO2 cooling cycle is presented. The effect of a two‐stage cycle with intercooling process on the system coefficient of cooling performance is presented for various gas cooler pressures. However, the performance comparison between one‐stage and two‐stage cycles is presented for same operating conditions. Gas cooler pressure, compressor isentropic efficiency, gas cooler efficiency, intercooling quantity and refrigerant outlet temperature from the gas cooler are used as variable parameters in the analysis. It is concluded that the performance of the two‐stage transcritical CO2 cycle is approximately 30% higher than that of the one‐stage transcritical CO2 cycle. Hence, the two‐stage compression and intercooling processes can be assumed as valuable applications to improve the transcritical CO2 cycle performance. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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针对某轮2号副机在高负荷运行时滑油温度较高故障,对相关原因进行筛查.在排除滑油温度控制阀和空冷器冷却水旁通阀本身问题的基础上,预判故障点在滑油冷却器上.对滑油冷却器的拆检证实其淡水进口被异物堵塞.清除淡水进口异物后,开机测试表明滑油温度正常,故障解决. 相似文献
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流化床冷渣器的设计与故障分析 总被引:3,自引:0,他引:3
近几年来,循环流化床锅炉(CFB锅炉)技术在国内发展迅速,随着循环流化床锅炉的大型化,采用流化床冷渣器已成主导方向,主要阐述了流化床冷渣器的工作原理、设计,对目前流化床冷渣器运行中出现的故障进行了分析并提出一些解决措施。 相似文献