燃气空调技术概述

本文从经济、技术层面简要介绍了以天然气为一次能源的各种空调技术,包括基本原理、技术特点、设备等。着重介绍了有可能在国内成功推广的天然气发动机驱动技术和相关的复合空调系统。     

基于最小二乘支持向量回归机的燃煤锅炉结渣特性预测

对燃煤锅炉结渣特性建模预测并结合优化算法实现燃烧优化是降低锅炉结渣几率有效的方法。文中将煤的软化温度tST、硅铝比w(SiO2)/w(Al2O3)、碱酸比J、硅比G以及锅炉的无因次炉膛平均温度ft、无因次切圆直径fd等作为输入变量,以结渣程度作为输出,建立最小二乘支持向量回归机燃煤锅炉结渣预测模型。同时采用显微镜原理对惩罚参数g和核参数s进行寻优,快速有效地获得二者的最优组合。通过对5台锅炉结渣特性进行预测评判,结果表明此方法是合理可行的。同时依据本方法及面向对象的高级语言,开发了相应的预测评判系统。     

基于GSA-SVM的循环流化床锅炉NOx排放特性模型

为了准确地预测循环流化床锅炉NOx排放量,以某热电厂循环流化床锅炉燃烧数据为样本,提出了基于支持向量机（SVM）的循环流化床锅炉NOx排放特性GSA-SVM模型。由于SVM精度及泛化能力依赖于参数选择,故将万有引力搜索算法（GSA）运用到模型参数寻优过程中,利用不同工况下的样本数据检验了模型的预测性能,并将该模型分别与BP神经网络、粒子群(PSO)和遗传算法(GA)优化的SVM模型进行比较,仿真实验证明GSA-SVM模型具有很好的辨识能力及良好的泛化能力。     

基于专用DCS的煤矿工业锅炉监控系统设计

简要介绍了一种煤矿工业锅炉的专用DCS监控系统设计方案,并进行了造价预算。实践证明采用专用DCS设计的煤矿工业锅炉监控系统较传统的PLC监控系统而言,具有更高的稳定性和更好的易用性,即插即用的设计非常适合现有技术人员。     

Combustion Systems for Biomass Fuel

Abstract

Biomass is one of humanity's earliest sources of energy. Traditionally, biomass has been utilized through direct combustion, and this process is still widely used in many parts of the world. Biomass thermo-chemical conversion investigations are certainly not the most important options at present; combustion is responsible for over 97% of the world's bio-energy production. Biomass combustion is a series of chemical reactions by which carbon is oxidized to carbon dioxide, and hydrogen is oxidized to water. Biomass fired domestic stoves are commonly used for space heating and cooking in the rural areas. Biomass residues are now widely used in many countries to provide centralized, medium and large-scale production of process heat for electricity production. Biomass is burned by direct combustion to produce steam, the steam turns a turbine and the turbine drives a generator, producing electricity.     

油田燃油气相变加热炉设计计算若干问题

从传热计算和建造规则两方面,对燃油气相变加热炉设计计算过程中的热负荷计算、辐射受热面传热计算、对流受热面传热计算以及建造规范应用等问题进行了阐述与分析,指出了相变加热炉设计计算过程中需要注意的问题。     

自适应模糊-PID控制在燃气锅炉系统中的应用

在介绍了燃气锅炉工业控制过程的基础上,提出了基于自适应模糊-PID控制算法相结合的控制系统设计方法,介绍了模糊控制器的设计、其软件的实现以及自适应方式的选择,通过系统仿真及实际系统应用参数的比较,证实了该系统具有良好的控制和节能效果。     

MODELING AND MEASUREMENTS OF INFRARED DRYERS FOR COATED PAPER

We have developed models to determine the radiative heat transfer of infrared dryers. Using the models, the efficiencies of several IR constructions are calculated. The radiation properties of all parts of the IR dryer are measured with an IT-IR spectrometer using integrating sphere techniques. With these models and measured results, the total efficiencies of several dryer constructions are calculated for: an electric dryer with a pambolic mirror, an elecmc dryer with a flat ceramic mirror, and a gas-fired dryer. The effect of a back reflector on these dryers is also calculated. The efficiencies of all these dryers are compared to each other.     

超临界直流锅炉再热蒸汽汽温调温方式探讨

探讨了超临界直流锅炉采用摆动燃烧器、尾部烟气调温挡板、喷水减温器和烟气再循环等几种再热蒸汽汽温调节方式及调节原理,分析了不同的汽温调节方式对于锅炉设计的影响及不同调温方式的优缺点。