某2×300WM循环流化床机组新建工程除尘器选型分析

目前我国燃煤电厂的主流除尘技术有两种,一种是电除尘技术,另一种则是布袋除尘技术。燃煤电厂尤其应用大的燃煤机组,电除尘器仍处主导地位,布袋除尘器的应用在近几年增长迅速,哪种除尘器更具有合理性、优越性值得去认真分析。     

电-袋除尘器在大型火电机组的应用分析

对我国大型燃煤火电厂烟气除尘技术进行了研究,重点分析了电-袋除尘器的结构及应用状况。在新的环保标准的颁布后,电-袋除尘器结合电除尘技术和布袋除尘技术的优点,将电除尘单元和布袋除尘单元串联运行,是我国电厂中应用的一种新型大型火电机组复合除尘装置,特别适合于我国许多单纯装设电除尘器或袋除尘器的660MW火电机组电除尘器的改造。     

330MW机组湿式电除尘器性能试验及评价

湿式电除尘器是燃煤电厂对多种污染物深度控制的环保设备,本文介绍了某330MW机组湿式电除尘器投运后的性能试验,并对其进行了综合评价,为今后湿式电除尘器的改造提供借鉴。     

浅析火力发电厂湿式除尘器电源发展方向

节能环保是我国的现行主要政策,受到社会各界的重视。在燃煤电厂,降低厂内生产用电率,就等于是降低了火力发电厂的生产经营成本,能够增强企业市场竞争力。目前的湿式电除尘设备在保证除去烟气中所含粉尘能力的同时可大大节约设备能量消耗,有广阔的应用前景。新型湿式电除尘器电源—脉冲电源技术已在较广泛的地方有多个成功案例,且使用效果较显著,它在确保除尘效率的条件下,最大节约电量可达75%以上,经多个样本测算,平均节约电量超过60%,达到了高效、节能的目的。     

浅析1000MW火力发电机组粉尘减排措施中电除尘器高频电源改造

本文分析了电除尘高频电源节能减排的原理,结合高频电源在广东台山电厂6号机组电除尘的实际应用,分析高频电源在1000MW火力发电机组节能减排效果、改造过程中出现的问题及处理措施,以及节能减排新技术的应用前景。     

静电除尘技术在高压火电厂中的应用分析

随着国际环保意识的加强,对我国燃煤电厂烟气除尘技术提出了更高的要求。认真分析了火电厂燃煤系统静电除尘技术的现状后,为满足新的环保标准,并提出了多种改进静电除尘技术,让燃煤系统的烟尘比电阻降低到电除尘范围,提高整体的除尘量,使燃煤系统的烟气排放达到最新的标准。     

略论火电厂电除尘技术的新进展及其特点

文章主要分析了我国燃煤电厂电除尘技术的特点。阐述了提效节能型EP高压电源的研发成功与推广，使EP由高效高能耗进入到高效低能耗时代。     

灵武电厂二期（2×1O00MW）机组微油点火系统问题分析

针对燃煤机组启停过程中需要燃烧大量燃油的问题,宁夏灵武电厂二期工程（2×1000MW）超超临界燃煤机组应用了微油点火技术。文章介绍了微油点火系统的基本组成及工作原理,微油点火系统运行中出现的问题及采取的措施,经济效益分析,为同类行机组采用微油点火技术提供借鉴。     

火力发电厂湿式电除尘电气系统的优化设计

本文从近几年湿式电除尘工程中的电气及相关控制设计的优化和实用进行研究和探索,对设计质量的提高及火电厂的经济运行有积极的意义。     

某火电厂等离子点火技术应用与节油设计

目前燃油价格飞涨,等离子点火可以大幅度减少燃煤机组在安装调试和启动阶段燃油的消耗。通过对已经投运的安装等离子点火装置的电厂能调研,并结合烟台龙源公司提供的资料,本文对在1000MW等级机组上应用等离子点火技术分别从技术和经济两方面分析,论述了在1000MW等级机组上采用等离子点火技术是可行性及经济性。     

Variation of physical and rheological properties of fly ash slurries with particle size and its effect on hydraulic transportation at high concentrations

In thermal power plants, fly ash is collected at the bottom of electrostatic precipitator (ESP) hoppers and transported to common sump for further disposal to the ash pond by slurry pipelines. The fly ash from different fields of ESP hoppers vary widely in particle size as well as quantity. Depending on the sequence of evacuation, the overall particle size distribution (PSD) would vary with time which in turn would affect the head requirement in the high concentration slurry disposal (HCSD) system. Fly ash samples from different fields of ESP hoppers of a thermal power plant have been analyzed for their physical properties namely the PSD, specific gravity, settling characteristics, pH of the slurry, etc. and for rheological properties in the concentration range of 60–70% (by weight). The particle size (d_wm) of the fly ash samples decreases with the increase in ESP field, whereas the static settled concentration and specific density increase. The pH values of all samples are almost constant and nonreactive in nature. The rheological properties namely yield stress and Bingham viscosity of the fly ash slurries from different fields of ESP hoppers increase with increase in concentration. Further at any given concentration, these parameters exhibit a strong dependence on particle size. Using these properties and treating the distribution of particles across the pipe cross section as homogeneous in the concentration range of 60–70% (by weight), CFD computations are made to evaluate the head requirement in a HCSD pipeline. The head loss increases with increase in concentration for all fields of ESP hoppers. The present study also shows that head requirement varies significantly by mixing different proportion of fly ash from different ESP fields.     

“减功率振打”在电除尘中的改造总结

分析了电除尘器传统振打方式存在的问题，结合电除尘器改造的实践，介绍“减功率振打”的工作原理、参数设定及其在实际应用中的重要作用。     

Dioxin levels in fly ash coming from the combustion of bagasse

Levels of dioxins (PCDD/Fs) were determined in fly ash samples collected from a power plant burning bagasse for production of electricity. The concentrations ranged from 2.2 pgWHO-TEQ/g to 190 pg WHO-TEQ/g with samples collected after ESP containing significantly much higher (more than 12 times on average) levels than samples collected before ESP. Our results seem to indicate that both the de novo and the precursor mechanisms are significantly involved in the formation of dioxins the fly ash during combustion of bagasse.     

DMS2800数字化钢球磨煤机控制系统在火电厂的应用

通过分析钢球磨煤机的数学模型、DMS2800系统性能和控制原理及其在广州瑞明电厂的应用效果,论述了 DMS2800数字化钢球磨煤机控制系统在火电厂的应用。     

直接空冷垃圾焚烧电厂的数值模拟计算分析

随着空冷技术在大型火力电厂上的广泛应用和安全运行,越来越多的在北方缺水地区建设的垃圾焚烧电厂,倾向于采用空冷技术,由于垃圾焚烧电厂与火力发电厂在厂房布置形式和空冷岛大小的差异,导致我们并不能简单的套用火力发电厂的空冷技术,在结合大连垃圾焚烧电厂的实地情况,并对该电厂进行空冷技术的数值模拟计算,为后期垃圾焚烧电厂的设计提供理论参考。     

Exergetic analysis and evaluation of coal-fired supercritical thermal power plant and natural gas-fired combined cycle power plant

The present work has been undertaken for energetic and exergetic analysis of coal-fired supercritical thermal power plant and natural gas-fired combined cycle power plant. Comparative analysis has been conducted for the two contestant technologies. The key drivers of energetic and exergetic efficiencies have been studied for each of the major sub-system of two contestant technologies. Overall energetic and exergetic efficiency of coal-fired supercritical thermal power plant are found to be 43.48 and 42.89 %, respectively. Overall energetic and exergetic efficiency of natural gas-fired combined cycle power plant are 54.47 and 53.93 %, respectively. The major energetic power loss has been found in the condenser for coal-fired supercritical thermal power plant. On the other hand, the major energetic power loss has been found in both the condenser and heat recovery steam generator for gas-fired combined cycle thermal power plant. The exergetic analysis shows that boiler field is the main source of exergetic power loss in coal-fired supercritical thermal power plant and combustion chamber in the gas-fired combined cycle thermal power plant. It is concluded that natural gas-fired combined cycle power plant is better from energetic and exergetic efficiency point of view. These results will be useful to all involved in the improvement of the design of the existing and future power plants.     

Modeling flow properties of fine dry powders using particle morphological properties and its effects on geometry of fly ash evacuation hoppers

This paper results from an ongoing effort to correlate the physical properties of powders at a fundamental level with their bulk behavior. Cohesion and unconfined yield stress are the measure of inter-particle forces of attraction in the bulk powder. The existing model for cohesion does not include important bulk properties, such as particle size distribution, tapped density, and prevailing applied stress. In the present paper, flow properties of 25 bulk solids (different cement and fly ash samples) have been evaluated using a ring shear tester and the products have been characterized according to their flowabilities. Models for cohesion and unconfined yield strength have been developed in this study by taking into account the effects of particle size distribution, tapped bulk density and pre-shear stress. The newly developed models have provided good fit to the experimental data. The effect of these flow properties on the design of hoppers have been investigated for fly ash samples collected from seven consecutive electrostatic precipitator (ESP) hoppers of a coal fired thermal power station. The results show that fly ash from the rear end ESP hopper would require higher amount of opening size compared to the first or second field of ESP to ensure proper mass flow condition is achieved at all the ESP hoppers.     

某2×300MW机组热电厂循环水余热回收技术研究

吸收式热泵式热电厂循环水余热回收技术的节能减排经济效益和社会效益非常巨大。但是,该技术还没有得到全面推广,大多数热电厂没有掌握技术要素,担心循环水余热回收系统故障导致机组循环水中断而造成停机的安全风险,以及投资风险性。笔者从事几个热电厂循环水余热回收项目的技术研究,并成功投入运营,取得巨大的经济和社会效益。本文对吸收热泵式热电厂循环水余热回收技术成功案例进行论述。     

旋转电极除尘器除尘效果分析

分析了旋转电极除尘器的应用案例，说明了旋转电极除尘器实际应用效果，并比较了旋转极板与固定极板的差异性，进而提出旋转电极除尘器稳定运行的保证措施。     

Characteristic of polychlorinated dibenzo-p-dioxins and dibenzofurans in fly ash from incinerators in china

Fly ash from municipal solid waste (MSW), medical waste (MW) and electrical power plant (EPP) incinerators were analyzed for polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). The study showed that the PCDD/F levels in fly ash were EPP < MSW < MW. The homologue profiles of PCDD/Fs in fly ash produced from waste incinerators were similar. However, the homologue profiles of PCDD/Fs in fly ash from electrostatic precipitator (ESP) of electrical power plant were different from that from waste incinerator. The strong correlation was found between the concentration of 2,3,4,7,8-PeCDF and the I-TEQ value of fly ash regardless of the different fly ashes sources.