Controlling power output of solar chimney power plant according to demand

ABSTRACT

The solar chimney power plant (SCPP) is a simple solar thermal power plant that is capable of converting solar energy into thermal energy in the solar collector. In the second stage, the generated thermal energy is converted into kinetic energy in the chimney and ultimately into electric energy using a combination of a wind turbine and a generator. The numerical simulations were performed for the geometry of the prototype in Manzanares, Spain. Using computational ?uid dynamics (CFD) techniques; we have simulated a two-dimensional axisymmetric model of a SCPP with the RNG k-ε turbulence. In this model, the discrete ordinates (DO) radiation model was implemented to solve the radiative transfer equation, using a two-band radiation model. The main objective of this work is to explore dynamic control over plant power output. We have presented a technique to control the power output of the solar chimney power plant, in order to deliver power according to specified demand patterns. In order to present this, the reference plant model was modified to include a secondary and tertiary collector roof under the existing main collector. In terms of base load electricity generation, the inclusion of a secondary and tertiary collector roof produces good control over plant output.     

双曲线钢筋混凝土冷却塔通风筒壁施工组织

结合具体工程实例，从施工准备、施工组织要点等方面，就双曲线钢筋混凝土冷却塔通风筒壁施工过程中的技术措施进行了介绍，提出了几点安全注意事项。     

某热电厂冷却塔选型研究

针对某火力发电厂＂热电联供＂机组运行方式多样和＂上大压小＂总平面布置紧张的特点,对本工程采用加高型自然塔（国产）或者大型机械通风冷却塔（以下简称机力塔）这两种方案的技术参数和经济指标进行了深入的论证分析,综合比较结果显示,本工程采用机力塔方案有更大的优势。     

A proposed stack configuration for dry cooling tower to improve cooling efficiency under crosswind

Cooling efficiency of a natural draft, dry cooling tower (NDDCT) is significantly affected under cross-wind condition and might decrease to 75 percent in the range of moderate to high wind-velocity condition. Separated flow occurring at the rear radiators, along with deflected plume exiting tower stack, reduces the cooling efficiency. Various researchers have recommended wind breakers to partially decrease the undesirable effect of the flow separation. But in the present research work, a new exit configuration has been proposed for tower stack, which could reduce the throttling effect of deflected plume. Numerical simulation of the proposed configuration showed improvement in the cooling efficiency up to 9 percent compared to the present, usual one at the generally investigated wind-velocity value of 10 m/s.     

Performance analysis of sloped solar chimney power plants in the southwestern region of Iran

The sloped solar chimney power plant (SSCPP) has significant capability to fulfil a part of the forthcoming energy requirements of villages located in the southwestern region of Iran. This paper presents the performance analysis of SSCPP which was expected to fulfil the urgent need for electric power in the southwestern region of Iran. However, to investigate the SSCPP performance and power generation throughout the southwestern region of Iran, five different regions across the Persian Gulf were considered. A mathematical model was developed to estimate the power output of solar chimneys. The performances, such as rate of air mass flow, system efficiency and solar collector efficiency, of the SSCPP were studied. The obtained results show that SSCPPs can produce from 2.98 to 5.91?MW of electricity power in the selected regions during different months of the year.     

浅谈火电厂冷却塔结构优化

以贵州省某火电厂为例,结合GB50009—2001建筑结构荷载规范,DL／T5339-2006火力发电厂水工设计规范等相关规定,对该工程冷却塔结构优化设计进行了探讨,通过方案比选及相关计算,确定了最佳结构设计方案。     

碳纤维布在某电厂冷却塔加固中的应用

简单介绍了碳纤维加固技术的原理和优点,以某电厂冷却塔加固工程为例,阐述了碳纤维布加固技术的施工工艺及注意事项,为类似工程积累了施工经验。     

ANSYS在双曲线冷却塔中的静力分析

分析了某工程中双曲线冷却塔的几何结构及荷载作用,运用ANSYS软件建立计算模型,考虑自重和风荷载两种工况,对双曲线冷却塔进行了静力分析,得到了一些有参考价值的结论。     

大型制冷站冷却塔的选型与安装形式

论述了冷却水流量，冷却塔冷幅，主导风向对制冷量或制冷效率的影响，合理的管路配接方式，管径匹配以及降低管路系统阻力的途径。结合实例分析了常见的错误并指出了正确的选择方案。     

淮浙煤电凤台电厂1号冷却塔工程风筒施工

结合具体工程实例,论述了冷却塔工程风筒施工的测量放线过程,提出了环梁1节~4节的施工方案,介绍了电动爬模施工技术,并列出了具体的施工程序,从而积累电厂冷却塔工程风筒施工经验。     

冷却塔供冷技术在我国应用的模拟与预测分析

认为冷却塔供冷 (又称免费供冷 )是一种节能降耗的系统形式。建立了冷却塔供冷系统在我国不同条件下的运行能耗模型 ,在模拟建筑上预测了全国 7个典型城市的应用情况 ,给出并分析了节能率、供冷温度等可用作设计参考的预测结果。     

冷却塔处于系统下部时的水力分析

通过水力分析，指出系统高度是决定这种系统能否安全有效运行的关键因素，建议系统高度不宜超过12m。     

火力发电厂湿烟囱渗漏原因分析及防腐改造

结合忻州广宇煤电有限公司烟囱防腐的改造案例,对石灰石—石膏湿法脱硫烟囱渗漏的原因及改造方案进行了分析比较,并对烟囱钛—钢复合板内筒的设计进行了详细阐述,为火力发电厂旧烟囱防腐改造积累了经验。     

冷却塔不均匀沉陷的应力分析

用一般的薄壳有限元分析方法 ,对某冷却塔由于地基下沉而引起塔应力的重新分布作了计算分析 ,提出了不均匀沉陷对塔应力分布规律的影响     

火力发电厂冷却塔混凝土的耐久性保护研究

本文论述了火力发电厂冷却塔混凝土耐久性保护的重要性,分析了影响混凝土耐久性的诸多因素,从理论上就冷却塔混凝土耐久性保护与防腐处理之间的关系进行了探讨,就混凝土耐久性的综合治理提出了解决方案.     

冷却塔安装及使用

详细介绍了冷却塔的安装进程,提出了冷却塔布置和运转时的注意事项,对常见故障原因进行了分析,提出了相应解决的对策,从而发挥冷却塔的功能。     

某热电厂冷却塔的控制爆破拆除设计

结合某电厂冷却塔的控制爆破拆除设计,详细介绍了高大薄壁混凝土构件控制爆破设计的要点及具体的施工工艺流程,对类似工程的设计施工具有参考价值.     

冷却塔结构强度及稳定性三维有限元计算分析

通过工程实例介绍了大型通用有限元软件ANSYS在双曲线冷却塔结构设计中的应用,计算分析表明：风荷载是冷却塔结构设计中的控制荷载;设计地震6度时冷却塔可以不作抗震验算仅采取抗震构造措施。     

Assessment of water availability for wet cooling at potential locations for solar thermal power generation in India

ABSTRACT

This study presents the results of a preliminary attempt to assess water availability for wet-cooled solar thermal power plants at potential locations in India. A total of 95 locations with sufficient wastelands and annual average DNI more than 2000?kWh/m² have been considered for the analysis. Options of rainwater harvesting and groundwater extraction have been explored. It was observed that with rainwater harvesting, only 12 locations in different states are suitable for adoption of wet cooling. Further, with only groundwater extraction option, only one location in the state of Madhya Pradesh is found to be suitable for adoption of wet cooling. By combining both the approaches, it is observed that 28 of the 95 locations would have sufficient water available to meet the requirements of the plant. In the remaining 67 potential locations, the adoption of other available cooling options with relatively lesser water requirements may be appropriate.     

特大型双曲线自然通风冷却塔噪声治理设计及效果

火力发电厂闭式循环冷却水系统多数是采用钢筋混凝土结构自然通风冷却塔,其噪声污染治理是一个难题。本文以上海吴泾电厂八期l撑2撑机组所用特大型双曲线自然通风冷却塔为例,介绍其噪声特性、控制措施及治理效果,可供同类冷却塔噪声控制参考。