掺烧高、焦炉煤气燃烧器设计体会

简要介绍了掺烧高、焦炉煤气燃烧器的设计要求 ,探讨了采用焦炉煤气点火、启动锅炉的问题和方法 ,肯定了栅格式高炉煤气喷嘴的效果     

低NOx燃烧器燃烧特性的数值模拟

研究对350MW电站锅炉采用低NOx燃烧器和常规直流煤粉燃烧器的燃烧过程进行了数值模拟.数值分析结果表明炉内的最高温度出现在燃烧器上部附近,在此区域,锅炉采用低NOx燃烧器的火焰中心温度比常规燃烧器的要高出100℃多,而对应2种燃烧器的截面平均温度沿炉高没有明显的区别;燃烧器区域的截面温度场呈现出马鞍形分布,即炉膛中心和炉壁附近的温度较小,其二者中间环形区域的温度最高;周期性变化的一次风喷嘴截面的火焰平均温度较高,二次风喷嘴截面的火焰平均温度较小,二者相差300℃左右,炉膛的切圆直径在燃烧器上部附近最小,在燃烧器区域,切圆直径几乎为常数,在燃烧器的上部和下部区域,炉膛截面的切圆直径较大;低NOx燃烧器和常规直流煤粉燃烧器所对应的切圆直径,在燃烧器的上部附近,低NOx燃烧器相应的切圆直径要大一些,在其它的区域中二者相应的切圆直径没有明显的区别.     

水平浓淡结构对燃烧器出口速度的影响

介绍了水平浓淡煤粉浓缩器在角式煤粉燃烧器中的应用,浓缩器结构变化对燃烧器出口速度的影响,该实验数据将为燃烧器的设计者提供设计参考。     

国产300 MW机组摆动燃烧器控制系统的改进

张家口发电厂5号锅炉改造摆动燃烧器,通过实验建模的方法得出了摆动燃烧器调节再热汽温的对象特性,同时还介绍了该系统的控制策略和现场控制系统,并运用MATLAB软件对控制参数进行了优化。     

The influence of gas radiation on the temperature decrease above a burner with a flat porous inert surface

The influence of the size of the hot gas volume on the temperature decrease due to radiative losses above a burner with a flat porous inert surface has been studied using a 1D and a 2D axisymmetric model. Based on the results of simulations with these models and stimulated by a formulation based on the weighted sum of gray gases model, a simple expression accounting for the effect of the hot gas volume size in 1D simulations is proposed. This model was validated with temperature measurements above a few burners with different sizes and the agreement is satisfactory. It is shown that the optically thin limit is applicable only for very small burners. The uncertainty of the optically thin limit grows with the diameter d of the burner and is already 10% for d=1 cm. On the other hand, a 1D model including self-adsorption is valid only for very large burners. For most applications, detailed computations of the radiative transfer should be applied. For fast computations it is advised that the above-mentioned simple model be used to account for emission and self-absorption.     

脉冲燃烧器的工作原理与应用

本文介绍了脉冲燃烧器的工作原理．阐述了这种燃烧器具有热效率高、烟气中有害成分少和结构简单等优点,有广泛的应用范围。影响脉冲燃烧器运行的主要因素有：燃烧器各部分的形状和尺寸、气阀的膜片、热负荷及燃气的燃烧特性。     

宽调节比燃烧器空气动力场的数值模拟

本文运行ｋ－ε模型对ＷＲ燃烧器空气动力场进行了数值计算,得到了流场中的轴向速度、湍动能以及湍能耗散率分布,分析比较了ＷＲ燃烧器与常规燃烧器的不同,利用计算结果分析了ＷＲ燃烧器中的位置及边宽对流场结构的影响。     

Experimental simulation on the integration of solid oxide fuel cell and micro-turbine generation system

Solid oxide fuel cell (SOFC) is characterized in high performance and high temperature exhaust, and it has potential to reach 70% efficiency if combined with gas turbine engine (GT). Because the SOFC is in developing stage, it is too expensive to obtain. This paper proposes a feasibility study by using a burner (Comb A) to simulate the high temperature exhaust gas of SOFC. The second burner (Comb B) is connected downstream of Comb A, and preheated hydrogen is injected to simulate the condition of sequential burner (SeqB). A turbocharger and a water injection system are also integrated in order to simulate the situation of a real SOFC/GT hybrid system. The water injection system is used to simulate the water mist addition at external reformer.     

氧—燃料烧嘴—节能与环保效益好的燃烧器

用氧气取代空气进行燃烧，可显著地降低燃耗，减少废气排放和ＮＯｘ形成，具有的节能和环保效益，并对氧－燃料技术的特点，节能和环保效果以及目前的应用进行了介绍。     

低NO_x煤粉燃烧器在我国的应用实绩

重点介绍我国应用的几种不同型式低NOx燃烧器特点、低NOx燃烧原理及在300MW级锅炉上的应用实绩，对确定锅炉燃烧系统有重要参考价值。