电袋复合除尘器在秦皇岛发电厂的应用

通过秦皇岛发电有限责任公司(简称秦皇岛发电厂)一期2台电除尘器采用电袋复合除尘技术改造的实例,介绍了改造方案及技术特点,分析了改造体会,指出了电袋复合除尘器是燃煤电厂增效改造的首选技术.     

电除尘器改造中电袋复合与纯袋式的比较

分析电除尘器、电袋复合除尘器、袋除尘器各自特点。根据环保要求,各行业电除尘器进行着大规模改造,分析几种改造方案的优缺点,结果表明袋除尘器效果最佳。     

大扩张角电袋复合除尘器内多孔板组合方案试验研究

为了改善大扩张角电袋复合除尘器入口流场速度分布,提高除尘器效率,采用不同开孔率多孔板的组合方案,对电袋复合除尘器进行了模拟试验。结果表明:入口截面相对速度偏差由84%降至21%,除尘器内各测量截面速度分布均达到标准要求;可以采用非均匀开孔率的多孔板组合方案来调节电厂电袋复合除尘器内部流场速度分布,从而增加电袋复合除尘器使用寿命,降低电袋复合除尘器维修成本,提高电袋复合除尘器效率。     

电袋复合除尘器在除尘增效改造中的应用

近年来,电袋复合除尘技术在燃煤锅炉烟气除尘行业的应用取得了快速发展,并实现了600、1 000 MW大型机组的突破。电袋复合除尘器已成为继电除尘器、袋式除尘器之后的新一代高效除尘设备。实践表明,电袋复合除尘器对煤种变化的适应性强,可长期保持低排放,并具有运行阻力低、占地面积小等优点。介绍了神华阳光2×135 MW CFB机组电除尘器改为电袋复合除尘器的工作机理、基本方案和技术特点,供同类工程参考。     

耦合增强电袋复合除尘器除尘性能实验测试研究

为评估新型耦合增强电袋复合除尘器对粉尘的脱除能力,分别对某电厂5号、6号锅炉配套的传统前电后袋式除尘器和耦合增强电袋复合除尘器进行粉尘及微细粉尘脱除效率测试。结果表明:耦合增强电袋复合除尘器对粉尘的脱除效率达99.958%～99.974%,对微细粉尘的脱除效率达99.101%～99.938%,分别比传统电袋复合除尘器高0.021%～0.027%和0.152%～0.281%;脱除效率随微细粉尘粒径的增大而增大;在所有电区中,混合电区对粉尘脱除的贡献最大。新型耦合增强电袋复合除尘器对粉尘及微细粉尘的脱除效率高于传统前电后袋结构的电袋复合除尘器,是一种可靠、高效的除尘设备。     

国电武威电厂除尘器选型

除尘器是火力发电厂的重要设备之一,合理选择除尘器对电厂的环保达标有着重要的作用。通过对国电武威电厂煤质的分析,对电除尘器、布袋除尘器和电袋复合除尘器进行技术经济的比较,最终选择电除尘器方案。     

国电武威电厂除尘器选型

除尘器是火力发电厂的重要设备之一。合理选择除尘器对电厂的环保达标有着重要的作用。通过对国电武威电厂煤质的分析，对电除尘器、布袋除尘器和电袋复合除尘器进行技术经济的比较，最终选择电除尘器方案。     

电袋复合除尘器性能试验

利用试验台进行电袋复合除尘器的冷模试验,可以系统地研究不同参数变化时除尘器性能的变化规律,从而可预测工程装置运行时的效果.介绍了厦门嵩屿电厂当除尘器含尘浓度、烟气量变化时除尘器性能的变化规律.     

印度火力发电厂除尘器的选择分析

以印度火力发电工程为例,针对当地典型烟煤的特点,分析五种常见除尘方式,对常规静电、电袋除尘器及转动极板式电除尘器进行了技术经济比较,推荐合适的除尘器型式,并对电袋除尘器设计中的问题做了分析。     

超净电袋复合除尘器提效改造的要点分析

正我国煤种复杂多变,长期以来,燃煤电站"市场煤"问题严重影响了进入锅炉煤的稳定性,大多数入炉煤种存在热值偏低、灰分偏高、波动大的问题,造成烟尘浓度变化幅度大,干式电除尘器效率波动,出口排放浓度无法长期稳定在设计值范围内,尤其无法满足超低排放的要求。电袋复合除尘器有机结合了电除尘和袋式除尘器的优势,能长期稳定保持低排放,并且电袋复合的独特结构对满足超低排放     

AN EFFICIENT SOLUTION SCHEME FOR APPLYING THE INTEGRAL-TYPE DYNAMIC LOCALIZATION SUBGRID-SCALE MODEL IN TURBULENCE WITH HOMOGENEOUS DIRECTIONS

The conventional integral-type dynamic localization subgrid-scale stress model is a Fredholm integral equation of the second kind. This model is mathematically consistent, but it has not been widely used in the large-eddy simulation community due to the relatively high computational cost of solving the Fredholm integral equation using an iterative scheme. In this article, a direct solution scheme based on a discrete Gaussian filter is developed to solve the integral system for turbulent flow with homogeneous dimensions. The proposed direct solution scheme is computationally efficient and makes the integral-type dynamic localization subgrid-scale stress model affordable. Turbulent Couette flows with Reynolds numbers of 2,600 and 4,762 are used in numerical simulations to validate the proposed approach.     

An impulsive noise filter applied in wireless control of wind turbines

This paper proposes a novel non-linear filter applied to wireless-transmitted reference signals in a deadbeat control strategy of a doubly-fed induction wind turbines. These signals are likely to be corrupted by spikes intrinsically imposed by the wireless channel. This impulsive noise is traditionally mitigated using classical error-correction schemes, and the proposed filter is an alternative that is simpler and has lower computational cost. The proposed technique, hereby designated as Functionally-Weighted Moving Average (FWMA) filter, is based on a non-conventional weighting of the signal samples, which is carried out by a rectangular function. The filter realization is as straight as any linear technique. The generator control scheme, which includes the filter, is embedded in a microprocessor locally placed at the generator site, where it acts on the reference signals at the receiving end of the channel. The performance of both the filter and the control system are verified by simulations that include the wind turbine dynamics and the communication channel. The proposed technique is compared with a morphological filter, previously suggested for the same purpose. The results endorse the FWMA filter efficacy to clean out impulsive interferences with minor delays.     

用于深度调峰机组的系列长叶片开发与应用

为了保证深度调峰机组长期运行的安全性,以哈尔滨汽轮机厂有限责任公司(HTC)200～600 MW等级主力机型的低压末两级长叶片为研究对象,通过对叶片结构的优化设计,在尽可能降低改造成本的前提下,研制了适用于深度调峰机组的系列新型低压长叶片。制定了哈汽公司不同功率等级主力机型深度调峰工况下的叶片改造方案,以应对调峰工况的主要风险。     

The efficiency of Ireland's Renewable Energy Feed-In Tariff (REFIT) for wind generation

Ireland's Renewable Energy Feed-In Tariff (REFIT) for wind generation has some unusual features making it different from other REFIT schemes around the world. By utilising an annual floor price element the scheme presents an option value to the contract holder, which to date has gone unnoticed or unvalued in the market. By employing an option pricing framework, this paper has quantified for the first time in the public domain the expected costs and value of the Irish REFIT support scheme for wind generation. While the cost of the REFIT scheme to the electricity consumer appears to be lower than the cost of schemes in other countries, significant inefficiencies exist as a result of the structure of the scheme. The Irish REFIT scheme is contrasted with a single Fixed Price support scheme and the analysis suggests that the Fixed Price scheme can provide a similar or greater incentive to the wind sector at half the cost to the end electricity consumer, and may also prove more compatible with consumers desire to reduce inter-year electricity portfolio cost volatility.     

高压馈电开关中失压延时保护应用分析

分析了传统的失压延时保护电路,提出了针对不同操作机构隔爆高压开关采用不同的改造方案,即永磁操作机构采用增加电容的改造方案,弹簧操作机构采用增加继电器+电容的开关改造方案。实践证明,此种改造方案简单易行,增强了电路的延时保护功能,大大降低了因电网波动引发供电中断而带来的负面影响。     

某柴油机滤清器支架的仿真计算及结构优化

针对某型柴油机在工作过程中出现的滤清器支架失效问题,采用ABAQUS、FEMFAT等软件对该支架进行有限元分析。通过模态分析评估支架是否存在共振风险;通过静强度和疲劳寿命校核,评估支架是否存在疲劳失效风险。在此基础上对原支架结构进行了优化。改进后的支架随整机通过了可靠性试验验证。结果表明:支架优化方案合理,能够满足使用要求。     

某H级燃机电厂再生水深度处理系统方案设计

  目的  为充分贯彻国家水资源开发利用方针，体现水资源重复利用的节水政策，越来越多南方地区电厂的工业用水水源采用再生水，有必要对其再生水深度处理系统方案设计进行探讨。  方法  以广东某H级燃机电厂为例，通过分析污水处理厂处理工艺、再生水出水水质指标，以及电厂工业用水水质要求，设计出最适合的再生水深度处理系统方案。  结果  采用的“接触絮凝斜板沉淀池＋过滤池”方案，系统流程简单，投资和运行费用低，且能保证系统安全、可靠运行。  结论  旨在为将来类似水源电厂再生水深度处理系统设计提供可借鉴的方案。     

Provincial allocation of coal de-capacity targets in China in terms of cost,efficiency, and fairness

Developing a de-capacity scheme that is economical, fair, and efficient, has become a key problem affecting the smooth achievement of coal de-capacity targets. It is also an important policy issue with regard to the overall implementation of China's supply-side structural reforms. In this study, we use the production function method as well as the panel variable coefficient model to calculate the 25 provinces' boundary production functions for the coal industry, which leads to the estimation of the coal capacity and capacity utilization rate of each province. Taking into account the labor resettlement cost and disposal cost of fixed assets, a total cost function of coal de-capacity is established. The growth rate function of total factor productivity (TFP) in the coal industry is constructed by the Solow residual value method. An allocation model of coal de-capacity is then proposed, based on multi-objective nonlinear optimization with constraint conditions on the total reduction amount and minimum output of coal in each region. Finally, using the relevant data of China's 25 coal-producing provinces in 1990–2015, the allocation of coal de-capacity is obtained under the goal of minimizing the total cost and maximizing the TFP growth rate. The results show that the capacity utilization rate of China's coal industry is much lower than the lower limit of the reasonable utilization ratio, while TFP shows negative growth over a long period. The comparative analytical results indicate that in terms of total cost, the optimal allocation scheme is 44.5335 billion yuan lower than the government allocation scheme. The disposal cost of fixed assets and labor resettlement costs decrease by 29.2749 billion yuan and 15.2586 billion yuan respectively. In terms of TFP growth, the optimal allocation scheme has a 1.54% higher TFP growth rate compared with the government allocation scheme. In terms of fairness, the Gini coefficients of the optimal scheme calculated by various indexes are all smaller than 0.3, placing the scheme within the category of considerable or absolute fairness. In addition, we calculate the optimal allocation ratio of coal de-capacity in the situation where cost preference and quality preference of central government are considered, to verify the intrinsic consistency of the model. In brief, the optimal allocation scheme proposed in this study effectively realizes the integration of economy, efficiency, and fairness.     

一种纤维颗粒过滤器的参数模型

应用柴油机颗粒过滤器来控制柴油机废气中排放的颗粒含量是十分重要的。纤维过滤器结构简单，所用材料低廉，是一种十分有效的柴油机颗粒过滤器。但迄今为止，讨论与时间相关的纤维过滤器模型的文献很少。本文提出了一种简单纤维过滤器的机理模型，其中过滤器的压力降、颗粒收集量及收集效率是运行时间和过滤器设计参数、运行参数的函数，这些参数包括纤维填充密度、过滤器长度、废气的流速和废气中颗粒浓度。根据此模型可以进行过滤器的优化设计，得到合理的设计参数和运行参数。     

变频器对船舶电网电流谐波影响及抑制方案

针对变频调速推进系统对船舶电网电流谐波的影响,通过改变变频器输出功率和输出频率,观察变频器交流侧电网电流谐波的变化规律,详细分析了变频器在交流电网侧产生的间谐波。结果表明,变频器输出功率、输出频率降低,交流电网侧电流谐波畸变率增大;间谐波主要分布于低频段,间谐波频率越低,谐波幅值越大。由此提出了基于无源滤波器、直流侧电容和高通滤波器综合滤波方案,并利用Matlab建立仿真模型进行分析,有效验证了方案的可行性。