中小型热电厂节能技术改造

中温中压参数的热电厂,循环热效率低,经济性差。随煤炭价格的上涨,2004年,2005年出现了全行业性亏损。要实现节能降耗,降低生产成本,采用高参数的锅炉的汽轮发电机组进行技术改造,是一种比较可行的节能措施,并且经济性效果显著。     

流化床锅炉的节能改造

文章介绍了一台循环流化床锅炉分离器的改造设计,通过改造设计,锅炉效率明显提高,实现了节能环保。     

循环流化床锅炉节能增效改造总结

在工业生产过程中因流化床锅炉自身具有高效、发电率强、燃料灵活性、低污染排放等优点,所以大部分工厂均采用循环流化床锅炉技术进行工艺生产加工.本文主要围绕着循环流化床锅炉技术的特点及存在的问题进行分析,并采取了一定的措施.     

75t/h中温中压循环流化床锅炉的设计及运行简述

阐述了75 t/h中温中压循环流化床锅炉的设计特点和运行时的特殊要求。     

300MW循环流化床锅炉机组的节能降耗

近年来循环流化床锅炉因其煤种适应范围广、经济、环保而得到快速的发展,但是循环流化床锅炉机组的厂用电率、供电煤耗等经济指标高于一般煤粉炉。本文主要分析了循环流化床锅炉通过改造设备、调整运行方法等手段来提高循环流化床锅炉机组的效率。     

某热电厂实施冷热电联产的节能分析

通过对热电联产冷分产及冷热电联产能源消耗的计算分析比较,进一步论述在热电厂热电联产基础上发展冷热电联产的可行性和合理性,结合实例说明发展冷热电联产所产生的经济性、节能性和环保性,并为其他热电厂的节能改造提出建议,     

B1.5-24/5型汽轮机的节能改造

介绍了B1.5-24/5汽轮机在使用过程中,受工况条件的影响产生出力不足后的改造问题。比较了改造后的工况情况,并介绍了一些设备运行的注意事项。     

锅炉燃烧系统中的节能

锅炉是国家重点耗能设备之一。文章分析了现阶段锅炉燃烧系统能耗大的主要原因．介绍了循环流化床在锅炉燃烧系统中如何实现节能降耗的原理。     

600MW超临界机组汽轮机改造与节能

文中详细介绍了采用日立技术生产制造的600 MW超临界压力机组,该机组已投产运行10年,汽轮机各项运行指标都有不同程度的下降,针对该汽轮机汽耗损失较大、效率偏低的情况,对该汽轮机机组实施了整体改造,不仅提高了汽轮机的运行效率,而且取得了较好的节能效果,并获得了提高汽轮机工作效率的方法。     

循环流化床锅炉的节能途径

叙述了循环流化床锅炉的优缺点,指出除尘器落下的飞灰是造成循环流化床锅炉降低热效率的主要原因.通过试验得出,降低飞灰可燃物含量和排烟热损失是实现循环流化床锅炉节能的途径.     

A study on energy saving in residential PEFC cogeneration systems

We have been developing technologies for energy saving in the residential sector. Recently, we have been concentrating our resources specifically into the development of polymer electrolyte fuel cell (PEFC) cogeneration systems. The system has excellent energy saving characteristics. However, the total amount of energy saved depends on how the system is operated. The characteristics of residential energy consumption are more complicated than in industrial use and depend on individual living patterns. It is therefore not easy to develop a control method for a system that can be generally applied across a wide variety of residential use.In this paper, we propose a system configuration and operation planning method developed for a residential PEFC cogeneration system. Using an operation planning method we developed, we demonstrate that our system provides higher energy savings than the conventional method. The energy saving rates are 15.9% under a large heat demand, 18.4% under a relatively high electrical demand and low heat demand, 1.3% under relative low electrical and heat demands.     

Thermoeconomic analysis of a power/water cogeneration plant

Cogeneration plants for simultaneous production of water and electricity are widely used in the Arabian Gulf region. They have proven to be more thermodynamically efficient and economically feasible than single purpose power generation and water production plants. Yet, there is no standard or universally applied methodology for determining unit cost of electric power generation and desalinated water production by dual purpose plants.A comprehensive literature survey to critically assess and evaluate different methods for cost application in power/water cogeneration plants is reported in this paper. Based on this analysis, an in-depth thermoeconomic study is carried out on a selected power/water cogeneration plant that employs a regenerative Rankine cycle. The system incorporates a boiler, back pressure turbine (supplying steam to two MSF distillers), a deaerator and two feed water heaters. The turbine generation is rated at 118 MW, while MSF distiller is rated at 7.7 MIGD at a top brine temperature of 105 °C. An appropriate costing procedure based on the available energy accounting method which divides benefits of the cogeneration configuration equitably between electricity generation and water production is used to determine the unit costs of electricity and water. Capital charges of common equipment such as the boiler, deaerator and feed water heaters as well as boiler fuel costs are distributed between power generated and desalinated water according to available energy consumption of the major subsystems. A detailed sensitivity analysis was performed to examine the impact of the variation of fuel cost, load and availability factors in addition to capital recovery factor on electricity and water production costs.     

热电厂汽动给水泵节能分析

汽动给水泵是热电厂利用富裕蒸汽 ,节能降耗的有效措施之一。它投资少、见效快 ,综合经济效益显著     

中温高发射率涂料节能

本文论述高发射率涂料在中温下使用,节能的若干关键问题。简介以优质涂料为核心的全套电阻炉节能技术,它比用现行方法生产的同型新炉约节能20%,比旧炉节能≥40%。     

600MW燃煤机组能效评价及节能分析

综合评价了国内5台典型的600 MW亚临界机组,并以其中一台机组为案例进行了节能分析。该机组通过对汽轮机的一系列节能治理,机组热耗率降低106 kJ?kWh-1,供电煤耗下降4.1 g?kWh-1;对锅炉鼓、引风机和脱硫系统相关辅机的改造共降低厂用电率0.26%,供电煤耗下降0.86 g?kWh-1。此外,分析认为消除汽机低压旁路阀泄漏及降低锅炉飞灰含碳量,供电煤耗还有降低1.3 g?kWh-1的潜力。     

Design and analysis of a solar tower power plant integrated with thermal energy storage system for cogeneration

In the current study, a solar tower–based energy system integrated with a thermal energy storage option is offered to supply both the electricity and freshwater through distillation and reverse osmosis technologies. A high‐temperature thermal energy storage subsystem using molten salt is considered for the effective and efficient operation of the integrated system. The molten salt is heated up to 565°C through passing the solar tower. The thermal energy storage tanks are designed to store heat up to 12 hours. The temperature variations in the storage tanks are studied and compared accordingly for evaluation. The effect of operating temperatures on the freshwater production and overall system efficiency is determined. About 24.46 MW electricity is generated in the steam turbine under sunny conditions. Furthermore, the storage subsystem stores heat during sunny hours to utilize later in cloudy hours and night time. The produced power decreases to 20.17 MW in discharging hours due to temperature decrease in the tank. The electricity generated by the system is then used to produce freshwater through the reverse osmosis units and also to supply electricity for the residential use. A total flowrate of 240.02 kg/s freshwater is obtained by distillation and reverse osmosis subsystems.     

Numerical based design of exhaust gas system in a cogeneration power plant

Among the various aspects that have to be analysed in a cogeneration and combined cycle plant design, the exhaust gas stack design can represent a critical aspect, in particular when a by-pass stack, which allows the modulation of heat-to-power generation, is present, since it may influence the entire system working condition. To properly take into account the large number of the different requirements which enter in an exhaust gas system design, a multidisciplinary analysis involving numerical integrated approaches can be adopted in order to obtain an optimally designed stack system. In this paper, the design of the exhaust gas system in a cogeneration plant is analysed. The design is performed numerically through a three-dimensional integrated numerical code. Different design solutions are simulated and the results discussed in detail.     

330MW空冷机组供热节能改造技术研究

针对国内现有结构设计及控制模式比较成熟的供热机组存在容量偏小、新建高参数机组供热能力不足的问题,提出对现有330MW空冷机组进行高背压改造的方案,通过对改造后运行参数和供热效果分析得出结论:改造后机组供热能力与经济性都有较大提高,为冬季需要供热地区相同模式的供热机组提供了节能减排的一种新思路。